Parsing.py 94.5 KB
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# cython: auto_cpdef=True, infer_types=True, language_level=3, py2_import=True
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#
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#   Parser
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#

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# This should be done automatically
import cython
cython.declare(Nodes=object, ExprNodes=object, EncodedString=object)

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import os
import re
import sys
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from Cython.Compiler.Scanning import PyrexScanner, FileSourceDescriptor
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import Nodes
import ExprNodes
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import StringEncoding
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from StringEncoding import EncodedString, BytesLiteral, _unicode, _bytes
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from ModuleNode import ModuleNode
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from Errors import error, warning, InternalError
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from Cython import Utils
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import Future
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import Options
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class Ctx(object):
    #  Parsing context
    level = 'other'
    visibility = 'private'
    cdef_flag = 0
    typedef_flag = 0
    api = 0
    overridable = 0
    nogil = 0
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    namespace = None
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    templates = None
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    def __init__(self, **kwds):
        self.__dict__.update(kwds)

    def __call__(self, **kwds):
        ctx = Ctx()
        d = ctx.__dict__
        d.update(self.__dict__)
        d.update(kwds)
        return ctx

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def p_ident(s, message = "Expected an identifier"):
    if s.sy == 'IDENT':
        name = s.systring
        s.next()
        return name
    else:
        s.error(message)

def p_ident_list(s):
    names = []
    while s.sy == 'IDENT':
        names.append(s.systring)
        s.next()
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        if s.sy != ',':
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            break
        s.next()
    return names

#------------------------------------------
#
#   Expressions
#
#------------------------------------------

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def p_binop_operator(s):
    pos = s.position()
    op = s.sy
    s.next()
    return op, pos

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def p_binop_expr(s, ops, p_sub_expr):
    n1 = p_sub_expr(s)
    while s.sy in ops:
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        op, pos = p_binop_operator(s)
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        n2 = p_sub_expr(s)
        n1 = ExprNodes.binop_node(pos, op, n1, n2)
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        if op == '/':
            if Future.division in s.context.future_directives:
                n1.truedivision = True
            else:
                n1.truedivision = None # unknown
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    return n1

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#lambdef: 'lambda' [varargslist] ':' test

def p_lambdef(s, allow_conditional=True):
    # s.sy == 'lambda'
    pos = s.position()
    s.next()
    if s.sy == ':':
        args = []
        star_arg = starstar_arg = None
    else:
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        args, star_arg, starstar_arg = p_varargslist(
            s, terminator=':', annotated=False)
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    s.expect(':')
    if allow_conditional:
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        expr = p_test(s)
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    else:
        expr = p_test_nocond(s)
    return ExprNodes.LambdaNode(
        pos, args = args,
        star_arg = star_arg, starstar_arg = starstar_arg,
        result_expr = expr)

#lambdef_nocond: 'lambda' [varargslist] ':' test_nocond

def p_lambdef_nocond(s):
    return p_lambdef(s, allow_conditional=False)

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#test: or_test ['if' or_test 'else' test] | lambdef
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def p_test(s):
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    if s.sy == 'lambda':
        return p_lambdef(s)
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    pos = s.position()
    expr = p_or_test(s)
    if s.sy == 'if':
        s.next()
        test = p_or_test(s)
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        s.expect('else')
        other = p_test(s)
        return ExprNodes.CondExprNode(pos, test=test, true_val=expr, false_val=other)
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    else:
        return expr

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#test_nocond: or_test | lambdef_nocond

def p_test_nocond(s):
    if s.sy == 'lambda':
        return p_lambdef_nocond(s)
    else:
        return p_or_test(s)
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#or_test: and_test ('or' and_test)*

def p_or_test(s):
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    return p_rassoc_binop_expr(s, ('or',), p_and_test)

def p_rassoc_binop_expr(s, ops, p_subexpr):
    n1 = p_subexpr(s)
    if s.sy in ops:
        pos = s.position()
        op = s.sy
        s.next()
        n2 = p_rassoc_binop_expr(s, ops, p_subexpr)
        n1 = ExprNodes.binop_node(pos, op, n1, n2)
    return n1

#and_test: not_test ('and' not_test)*

def p_and_test(s):
    #return p_binop_expr(s, ('and',), p_not_test)
    return p_rassoc_binop_expr(s, ('and',), p_not_test)

#not_test: 'not' not_test | comparison

def p_not_test(s):
    if s.sy == 'not':
        pos = s.position()
        s.next()
        return ExprNodes.NotNode(pos, operand = p_not_test(s))
    else:
        return p_comparison(s)

#comparison: expr (comp_op expr)*
#comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'

def p_comparison(s):
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    n1 = p_starred_expr(s)
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    if s.sy in comparison_ops:
        pos = s.position()
        op = p_cmp_op(s)
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        n2 = p_starred_expr(s)
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        n1 = ExprNodes.PrimaryCmpNode(pos,
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            operator = op, operand1 = n1, operand2 = n2)
        if s.sy in comparison_ops:
            n1.cascade = p_cascaded_cmp(s)
    return n1

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def p_test_or_starred_expr(s):
    if s.sy == '*':
        return p_starred_expr(s)
    else:
        return p_test(s)

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def p_starred_expr(s):
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    pos = s.position()
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    if s.sy == '*':
        starred = True
        s.next()
    else:
        starred = False
    expr = p_bit_expr(s)
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    if starred:
        expr = ExprNodes.StarredTargetNode(pos, expr)
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    return expr

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def p_cascaded_cmp(s):
    pos = s.position()
    op = p_cmp_op(s)
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    n2 = p_starred_expr(s)
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    result = ExprNodes.CascadedCmpNode(pos,
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        operator = op, operand2 = n2)
    if s.sy in comparison_ops:
        result.cascade = p_cascaded_cmp(s)
    return result

def p_cmp_op(s):
    if s.sy == 'not':
        s.next()
        s.expect('in')
        op = 'not_in'
    elif s.sy == 'is':
        s.next()
        if s.sy == 'not':
            s.next()
            op = 'is_not'
        else:
            op = 'is'
    else:
        op = s.sy
        s.next()
    if op == '<>':
        op = '!='
    return op
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comparison_ops = (
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    '<', '>', '==', '>=', '<=', '<>', '!=',
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    'in', 'is', 'not'
)

#expr: xor_expr ('|' xor_expr)*

def p_bit_expr(s):
    return p_binop_expr(s, ('|',), p_xor_expr)

#xor_expr: and_expr ('^' and_expr)*

def p_xor_expr(s):
    return p_binop_expr(s, ('^',), p_and_expr)

#and_expr: shift_expr ('&' shift_expr)*

def p_and_expr(s):
    return p_binop_expr(s, ('&',), p_shift_expr)

#shift_expr: arith_expr (('<<'|'>>') arith_expr)*

def p_shift_expr(s):
    return p_binop_expr(s, ('<<', '>>'), p_arith_expr)

#arith_expr: term (('+'|'-') term)*

def p_arith_expr(s):
    return p_binop_expr(s, ('+', '-'), p_term)

#term: factor (('*'|'/'|'%') factor)*

def p_term(s):
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    return p_binop_expr(s, ('*', '/', '%', '//'), p_factor)
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#factor: ('+'|'-'|'~'|'&'|typecast|sizeof) factor | power

def p_factor(s):
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    # little indirection for C-ification purposes
    return _p_factor(s)

def _p_factor(s):
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    sy = s.sy
    if sy in ('+', '-', '~'):
        op = s.sy
        pos = s.position()
        s.next()
        return ExprNodes.unop_node(pos, op, p_factor(s))
    elif sy == '&':
        pos = s.position()
        s.next()
        arg = p_factor(s)
        return ExprNodes.AmpersandNode(pos, operand = arg)
    elif sy == "<":
        return p_typecast(s)
    elif sy == 'IDENT' and s.systring == "sizeof":
        return p_sizeof(s)
    else:
        return p_power(s)

def p_typecast(s):
    # s.sy == "<"
    pos = s.position()
    s.next()
    base_type = p_c_base_type(s)
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    if base_type.name is None:
        s.error("Unknown type")
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    declarator = p_c_declarator(s, empty = 1)
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    if s.sy == '?':
        s.next()
        typecheck = 1
    else:
        typecheck = 0
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    s.expect(">")
    operand = p_factor(s)
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    return ExprNodes.TypecastNode(pos,
        base_type = base_type,
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        declarator = declarator,
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        operand = operand,
        typecheck = typecheck)
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def p_sizeof(s):
    # s.sy == ident "sizeof"
    pos = s.position()
    s.next()
    s.expect('(')
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    # Here we decide if we are looking at an expression or type
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    # If it is actually a type, but parsable as an expression,
    # we treat it as an expression here.
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    if looking_at_expr(s):
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        operand = p_test(s)
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        node = ExprNodes.SizeofVarNode(pos, operand = operand)
    else:
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        base_type = p_c_base_type(s)
        declarator = p_c_declarator(s, empty = 1)
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        node = ExprNodes.SizeofTypeNode(pos,
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            base_type = base_type, declarator = declarator)
    s.expect(')')
    return node

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def p_yield_expression(s):
    # s.sy == "yield"
    pos = s.position()
    s.next()
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    if s.sy != ')' and s.sy not in statement_terminators:
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        arg = p_testlist(s)
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    else:
        arg = None
    return ExprNodes.YieldExprNode(pos, arg=arg)

def p_yield_statement(s):
    # s.sy == "yield"
    yield_expr = p_yield_expression(s)
    return Nodes.ExprStatNode(yield_expr.pos, expr=yield_expr)
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#power: atom trailer* ('**' factor)*

def p_power(s):
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    if s.systring == 'new' and s.peek()[0] == 'IDENT':
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        return p_new_expr(s)
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    n1 = p_atom(s)
    while s.sy in ('(', '[', '.'):
        n1 = p_trailer(s, n1)
    if s.sy == '**':
        pos = s.position()
        s.next()
        n2 = p_factor(s)
        n1 = ExprNodes.binop_node(pos, '**', n1, n2)
    return n1

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def p_new_expr(s):
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    # s.systring == 'new'.
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    pos = s.position()
    s.next()
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    cppclass = p_c_base_type(s)
    return p_call(s, ExprNodes.NewExprNode(pos, cppclass = cppclass))
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#trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME

def p_trailer(s, node1):
    pos = s.position()
    if s.sy == '(':
        return p_call(s, node1)
    elif s.sy == '[':
        return p_index(s, node1)
    else: # s.sy == '.'
        s.next()
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        name = EncodedString( p_ident(s) )
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        return ExprNodes.AttributeNode(pos,
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            obj = node1, attribute = name)

# arglist:  argument (',' argument)* [',']
# argument: [test '='] test       # Really [keyword '='] test

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def p_call_parse_args(s, allow_genexp = True):
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    # s.sy == '('
    pos = s.position()
    s.next()
    positional_args = []
    keyword_args = []
    star_arg = None
    starstar_arg = None
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    while s.sy not in ('**', ')'):
        if s.sy == '*':
            if star_arg:
                s.error("only one star-arg parameter allowed",
                    pos = s.position())
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            s.next()
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            star_arg = p_test(s)
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        else:
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            arg = p_test(s)
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            if s.sy == '=':
                s.next()
                if not arg.is_name:
                    s.error("Expected an identifier before '='",
                        pos = arg.pos)
                encoded_name = EncodedString(arg.name)
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                keyword = ExprNodes.IdentifierStringNode(arg.pos, value = encoded_name)
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                arg = p_test(s)
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                keyword_args.append((keyword, arg))
            else:
                if keyword_args:
                    s.error("Non-keyword arg following keyword arg",
                        pos = arg.pos)
                if star_arg:
                    s.error("Non-keyword arg following star-arg",
                        pos = arg.pos)
                positional_args.append(arg)
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        if s.sy != ',':
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            break
        s.next()
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    if s.sy == 'for':
        if len(positional_args) == 1 and not star_arg:
            positional_args = [ p_genexp(s, positional_args[0]) ]
    elif s.sy == '**':
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        s.next()
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        starstar_arg = p_test(s)
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        if s.sy == ',':
            s.next()
    s.expect(')')
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    return positional_args, keyword_args, star_arg, starstar_arg

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def p_call_build_packed_args(pos, positional_args, keyword_args, star_arg):
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    arg_tuple = None
    keyword_dict = None
    if positional_args or not star_arg:
        arg_tuple = ExprNodes.TupleNode(pos,
            args = positional_args)
    if star_arg:
        star_arg_tuple = ExprNodes.AsTupleNode(pos, arg = star_arg)
        if arg_tuple:
            arg_tuple = ExprNodes.binop_node(pos,
                operator = '+', operand1 = arg_tuple,
                operand2 = star_arg_tuple)
        else:
            arg_tuple = star_arg_tuple
    if keyword_args:
        keyword_args = [ExprNodes.DictItemNode(pos=key.pos, key=key, value=value)
                          for key, value in keyword_args]
        keyword_dict = ExprNodes.DictNode(pos,
            key_value_pairs = keyword_args)
    return arg_tuple, keyword_dict

def p_call(s, function):
    # s.sy == '('
    pos = s.position()

    positional_args, keyword_args, star_arg, starstar_arg = \
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                     p_call_parse_args(s)
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    if not (keyword_args or star_arg or starstar_arg):
        return ExprNodes.SimpleCallNode(pos,
            function = function,
            args = positional_args)
    else:
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        arg_tuple, keyword_dict = p_call_build_packed_args(
            pos, positional_args, keyword_args, star_arg)
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        return ExprNodes.GeneralCallNode(pos,
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            function = function,
            positional_args = arg_tuple,
            keyword_args = keyword_dict,
            starstar_arg = starstar_arg)

#lambdef: 'lambda' [varargslist] ':' test

#subscriptlist: subscript (',' subscript)* [',']

def p_index(s, base):
    # s.sy == '['
    pos = s.position()
    s.next()
    subscripts = p_subscript_list(s)
    if len(subscripts) == 1 and len(subscripts[0]) == 2:
        start, stop = subscripts[0]
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        result = ExprNodes.SliceIndexNode(pos,
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            base = base, start = start, stop = stop)
    else:
        indexes = make_slice_nodes(pos, subscripts)
        if len(indexes) == 1:
            index = indexes[0]
        else:
            index = ExprNodes.TupleNode(pos, args = indexes)
        result = ExprNodes.IndexNode(pos,
            base = base, index = index)
    s.expect(']')
    return result

def p_subscript_list(s):
    items = [p_subscript(s)]
    while s.sy == ',':
        s.next()
        if s.sy == ']':
            break
        items.append(p_subscript(s))
    return items

#subscript: '.' '.' '.' | test | [test] ':' [test] [':' [test]]

def p_subscript(s):
    # Parse a subscript and return a list of
    # 1, 2 or 3 ExprNodes, depending on how
    # many slice elements were encountered.
    pos = s.position()
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    start = p_slice_element(s, (':',))
    if s.sy != ':':
        return [start]
    s.next()
    stop = p_slice_element(s, (':', ',', ']'))
    if s.sy != ':':
        return [start, stop]
    s.next()
    step = p_slice_element(s, (':', ',', ']'))
    return [start, stop, step]
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def p_slice_element(s, follow_set):
    # Simple expression which may be missing iff
    # it is followed by something in follow_set.
    if s.sy not in follow_set:
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        return p_test(s)
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    else:
        return None

def expect_ellipsis(s):
    s.expect('.')
    s.expect('.')
    s.expect('.')

def make_slice_nodes(pos, subscripts):
    # Convert a list of subscripts as returned
    # by p_subscript_list into a list of ExprNodes,
    # creating SliceNodes for elements with 2 or
    # more components.
    result = []
    for subscript in subscripts:
        if len(subscript) == 1:
            result.append(subscript[0])
        else:
            result.append(make_slice_node(pos, *subscript))
    return result

def make_slice_node(pos, start, stop = None, step = None):
    if not start:
        start = ExprNodes.NoneNode(pos)
    if not stop:
        stop = ExprNodes.NoneNode(pos)
    if not step:
        step = ExprNodes.NoneNode(pos)
    return ExprNodes.SliceNode(pos,
        start = start, stop = stop, step = step)

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#atom: '(' [yield_expr|testlist_comp] ')' | '[' [listmaker] ']' | '{' [dict_or_set_maker] '}' | '`' testlist '`' | NAME | NUMBER | STRING+
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def p_atom(s):
    pos = s.position()
    sy = s.sy
    if sy == '(':
        s.next()
        if s.sy == ')':
            result = ExprNodes.TupleNode(pos, args = [])
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        elif s.sy == 'yield':
            result = p_yield_expression(s)
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        else:
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            result = p_testlist_comp(s)
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        s.expect(')')
        return result
    elif sy == '[':
        return p_list_maker(s)
    elif sy == '{':
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        return p_dict_or_set_maker(s)
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    elif sy == '`':
        return p_backquote_expr(s)
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    elif sy == '.':
        expect_ellipsis(s)
        return ExprNodes.EllipsisNode(pos)
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    elif sy == 'INT':
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        return p_int_literal(s)
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    elif sy == 'FLOAT':
        value = s.systring
        s.next()
        return ExprNodes.FloatNode(pos, value = value)
    elif sy == 'IMAG':
        value = s.systring[:-1]
        s.next()
        return ExprNodes.ImagNode(pos, value = value)
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    elif sy == 'BEGIN_STRING':
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        kind, bytes_value, unicode_value = p_cat_string_literal(s)
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        if kind == 'c':
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            return ExprNodes.CharNode(pos, value = bytes_value)
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        elif kind == 'u':
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            return ExprNodes.UnicodeNode(pos, value = unicode_value, bytes_value = bytes_value)
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        elif kind == 'b':
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            return ExprNodes.BytesNode(pos, value = bytes_value)
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        else:
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            return ExprNodes.StringNode(pos, value = bytes_value, unicode_value = unicode_value)
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    elif sy == 'IDENT':
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        name = EncodedString( s.systring )
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        s.next()
        if name == "None":
            return ExprNodes.NoneNode(pos)
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        elif name == "True":
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            return ExprNodes.BoolNode(pos, value=True)
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        elif name == "False":
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            return ExprNodes.BoolNode(pos, value=False)
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        elif name == "NULL" and not s.in_python_file:
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            return ExprNodes.NullNode(pos)
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        else:
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            return p_name(s, name)
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    else:
        s.error("Expected an identifier or literal")

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def p_int_literal(s):
    pos = s.position()
    value = s.systring
    s.next()
    unsigned = ""
    longness = ""
    while value[-1] in u"UuLl":
        if value[-1] in u"Ll":
            longness += "L"
        else:
            unsigned += "U"
        value = value[:-1]
    # '3L' is ambiguous in Py2 but not in Py3.  '3U' and '3LL' are
    # illegal in Py2 Python files.  All suffixes are illegal in Py3
    # Python files.
    is_c_literal = None
    if unsigned:
        is_c_literal = True
    elif longness:
        if longness == 'LL' or s.context.language_level >= 3:
            is_c_literal = True
    if s.in_python_file:
        if is_c_literal:
            error(pos, "illegal integer literal syntax in Python source file")
        is_c_literal = False
    return ExprNodes.IntNode(pos,
                             is_c_literal = is_c_literal,
                             value = value,
                             unsigned = unsigned,
                             longness = longness)

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def p_name(s, name):
    pos = s.position()
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    if not s.compile_time_expr and name in s.compile_time_env:
        value = s.compile_time_env.lookup_here(name)
        rep = repr(value)
        if isinstance(value, bool):
            return ExprNodes.BoolNode(pos, value = value)
        elif isinstance(value, int):
            return ExprNodes.IntNode(pos, value = rep)
        elif isinstance(value, long):
            return ExprNodes.IntNode(pos, value = rep, longness = "L")
        elif isinstance(value, float):
            return ExprNodes.FloatNode(pos, value = rep)
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        elif isinstance(value, _unicode):
            return ExprNodes.UnicodeNode(pos, value = value)
        elif isinstance(value, _bytes):
            return ExprNodes.BytesNode(pos, value = value)
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        else:
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            error(pos, "Invalid type for compile-time constant: %s"
                % value.__class__.__name__)
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    return ExprNodes.NameNode(pos, name = name)

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def p_cat_string_literal(s):
    # A sequence of one or more adjacent string literals.
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    # Returns (kind, bytes_value, unicode_value)
    # where kind in ('b', 'c', 'u', '')
    kind, bytes_value, unicode_value = p_string_literal(s)
    if kind == 'c' or s.sy != 'BEGIN_STRING':
        return kind, bytes_value, unicode_value
    bstrings, ustrings = [bytes_value], [unicode_value]
    bytes_value = unicode_value = None
    while s.sy == 'BEGIN_STRING':
        pos = s.position()
        next_kind, next_bytes_value, next_unicode_value = p_string_literal(s)
        if next_kind == 'c':
            error(pos, "Cannot concatenate char literal with another string or char literal")
        elif next_kind != kind:
            error(pos, "Cannot mix string literals of different types, expected %s'', got %s''" %
                  (kind, next_kind))
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        else:
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            bstrings.append(next_bytes_value)
            ustrings.append(next_unicode_value)
    # join and rewrap the partial literals
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    if kind in ('b', 'c', '') or kind == 'u' and None not in bstrings:
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        # Py3 enforced unicode literals are parsed as bytes/unicode combination
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        bytes_value = BytesLiteral( StringEncoding.join_bytes(bstrings) )
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        bytes_value.encoding = s.source_encoding
    if kind in ('u', ''):
        unicode_value = EncodedString( u''.join([ u for u in ustrings if u is not None ]) )
    return kind, bytes_value, unicode_value

def p_opt_string_literal(s, required_type='u'):
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    if s.sy == 'BEGIN_STRING':
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        kind, bytes_value, unicode_value = p_string_literal(s, required_type)
        if required_type == 'u':
            return unicode_value
        elif required_type == 'b':
            return bytes_value
        else:
            s.error("internal parser configuration error")
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    else:
        return None

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def check_for_non_ascii_characters(string):
    for c in string:
        if c >= u'\x80':
            return True
    return False

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def p_string_literal(s, kind_override=None):
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    # A single string or char literal.  Returns (kind, bvalue, uvalue)
    # where kind in ('b', 'c', 'u', '').  The 'bvalue' is the source
    # code byte sequence of the string literal, 'uvalue' is the
    # decoded Unicode string.  Either of the two may be None depending
    # on the 'kind' of string, only unprefixed strings have both
    # representations.

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    # s.sy == 'BEGIN_STRING'
    pos = s.position()
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    is_raw = 0
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    is_python3_source = s.context.language_level >= 3
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    has_non_ASCII_literal_characters = False
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    kind = s.systring[:1].lower()
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    if kind == 'r':
        kind = ''
        is_raw = 1
    elif kind in 'ub':
        is_raw = s.systring[1:2].lower() == 'r'
    elif kind != 'c':
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        kind = ''
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    if kind == '' and kind_override is None and Future.unicode_literals in s.context.future_directives:
        chars = StringEncoding.StrLiteralBuilder(s.source_encoding)
        kind = 'u'
    else:
        if kind_override is not None and kind_override in 'ub':
            kind = kind_override
        if kind == 'u':
            chars = StringEncoding.UnicodeLiteralBuilder()
        elif kind == '':
            chars = StringEncoding.StrLiteralBuilder(s.source_encoding)
        else:
            chars = StringEncoding.BytesLiteralBuilder(s.source_encoding)
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    while 1:
        s.next()
        sy = s.sy
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        systr = s.systring
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        #print "p_string_literal: sy =", sy, repr(s.systring) ###
        if sy == 'CHARS':
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            chars.append(systr)
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            if is_python3_source and not has_non_ASCII_literal_characters and check_for_non_ascii_characters(systr):
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                has_non_ASCII_literal_characters = True
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        elif sy == 'ESCAPE':
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            if is_raw:
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                chars.append(systr)
                if is_python3_source and not has_non_ASCII_literal_characters \
                       and check_for_non_ascii_characters(systr):
                    has_non_ASCII_literal_characters = True
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            else:
                c = systr[1]
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                if c in u"01234567":
                    chars.append_charval( int(systr[1:], 8) )
                elif c in u"'\"\\":
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                    chars.append(c)
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                elif c in u"abfnrtv":
                    chars.append(
                        StringEncoding.char_from_escape_sequence(systr))
                elif c == u'\n':
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                    pass
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                elif c == u'x':
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                    if len(systr) == 4:
                        chars.append_charval( int(systr[2:], 16) )
                    else:
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                        s.error("Invalid hex escape '%s'" % systr)
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                elif c in u'Uu':
                    if kind in ('u', ''):
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                        if len(systr) in (6,10):
                            chrval = int(systr[2:], 16)
                            if chrval > 1114111: # sys.maxunicode:
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                                s.error("Invalid unicode escape '%s'" % systr)
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                        else:
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                            s.error("Invalid unicode escape '%s'" % systr)
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                    else:
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                        # unicode escapes in byte strings are not unescaped
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                        chrval = None
                    chars.append_uescape(chrval, systr)
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                else:
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                    chars.append(u'\\' + systr[1:])
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                    if is_python3_source and not has_non_ASCII_literal_characters \
                           and check_for_non_ascii_characters(systr):
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                        has_non_ASCII_literal_characters = True
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        elif sy == 'NEWLINE':
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            chars.append(u'\n')
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        elif sy == 'END_STRING':
            break
        elif sy == 'EOF':
            s.error("Unclosed string literal", pos = pos)
        else:
            s.error(
                "Unexpected token %r:%r in string literal" %
                    (sy, s.systring))
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    if kind == 'c':
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        unicode_value = None
        bytes_value = chars.getchar()
        if len(bytes_value) != 1:
            error(pos, u"invalid character literal: %r" % bytes_value)
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    else:
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        bytes_value, unicode_value = chars.getstrings()
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        if is_python3_source and has_non_ASCII_literal_characters:
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            # Python 3 forbids literal non-ASCII characters in byte strings
            if kind != 'u':
                s.error("bytes can only contain ASCII literal characters.", pos = pos)
            bytes_value = None
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    s.next()
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    return (kind, bytes_value, unicode_value)
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# list_display      ::=      "[" [listmaker] "]"
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# listmaker     ::=     expression ( comp_for | ( "," expression )* [","] )
# comp_iter     ::=     comp_for | comp_if
# comp_for     ::=     "for" expression_list "in" testlist [comp_iter]
# comp_if     ::=     "if" test [comp_iter]
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def p_list_maker(s):
    # s.sy == '['
    pos = s.position()
    s.next()
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    if s.sy == ']':
        s.expect(']')
        return ExprNodes.ListNode(pos, args = [])
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    expr = p_test(s)
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    if s.sy == 'for':
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        target = ExprNodes.ListNode(pos, args = [])
        append = ExprNodes.ComprehensionAppendNode(
            pos, expr=expr, target=ExprNodes.CloneNode(target))
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        loop = p_comp_for(s, append)
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        s.expect(']')
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        return ExprNodes.ComprehensionNode(
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            pos, loop=loop, append=append, target=target,
            # list comprehensions leak their loop variable in Py2
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            has_local_scope = s.context.language_level >= 3)
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    else:
        if s.sy == ',':
            s.next()
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            exprs = p_simple_expr_list(s, expr)
        else:
            exprs = [expr]
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        s.expect(']')
        return ExprNodes.ListNode(pos, args = exprs)
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def p_comp_iter(s, body):
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    if s.sy == 'for':
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        return p_comp_for(s, body)
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    elif s.sy == 'if':
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        return p_comp_if(s, body)
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    else:
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        # insert the 'append' operation into the loop
        return body
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def p_comp_for(s, body):
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    # s.sy == 'for'
    pos = s.position()
    s.next()
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    kw = p_for_bounds(s, allow_testlist=False)
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    kw.update(else_clause = None, body = p_comp_iter(s, body))
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    return Nodes.ForStatNode(pos, **kw)
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def p_comp_if(s, body):
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    # s.sy == 'if'
    pos = s.position()
    s.next()
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    test = p_test_nocond(s)
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    return Nodes.IfStatNode(pos,
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        if_clauses = [Nodes.IfClauseNode(pos, condition = test,
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                                         body = p_comp_iter(s, body))],
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        else_clause = None )
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#dictmaker: test ':' test (',' test ':' test)* [',']

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def p_dict_or_set_maker(s):
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    # s.sy == '{'
    pos = s.position()
    s.next()
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    if s.sy == '}':
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        s.next()
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        return ExprNodes.DictNode(pos, key_value_pairs = [])
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    item = p_test(s)
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    if s.sy == ',' or s.sy == '}':
        # set literal
        values = [item]
        while s.sy == ',':
            s.next()
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            if s.sy == '}':
                break
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            values.append( p_test(s) )
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        s.expect('}')
        return ExprNodes.SetNode(pos, args=values)
    elif s.sy == 'for':
        # set comprehension
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        target = ExprNodes.SetNode(pos, args=[])
        append = ExprNodes.ComprehensionAppendNode(
            item.pos, expr=item, target=ExprNodes.CloneNode(target))
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        loop = p_comp_for(s, append)
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        s.expect('}')
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        return ExprNodes.ComprehensionNode(
            pos, loop=loop, append=append, target=target)
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    elif s.sy == ':':
        # dict literal or comprehension
        key = item
        s.next()
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        value = p_test(s)
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        if s.sy == 'for':
            # dict comprehension
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            target = ExprNodes.DictNode(pos, key_value_pairs = [])
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            append = ExprNodes.DictComprehensionAppendNode(
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                item.pos, key_expr=key, value_expr=value,
                target=ExprNodes.CloneNode(target))
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            loop = p_comp_for(s, append)
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            s.expect('}')
            return ExprNodes.ComprehensionNode(
                pos, loop=loop, append=append, target=target)
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        else:
            # dict literal
            items = [ExprNodes.DictItemNode(key.pos, key=key, value=value)]
            while s.sy == ',':
                s.next()
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                if s.sy == '}':
                    break
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                key = p_test(s)
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                s.expect(':')
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                value = p_test(s)
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                items.append(
                    ExprNodes.DictItemNode(key.pos, key=key, value=value))
            s.expect('}')
            return ExprNodes.DictNode(pos, key_value_pairs=items)
    else:
        # raise an error
        s.expect('}')
    return ExprNodes.DictNode(pos, key_value_pairs = [])
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# NOTE: no longer in Py3 :)
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def p_backquote_expr(s):
    # s.sy == '`'
    pos = s.position()
    s.next()
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    args = [p_test(s)]
    while s.sy == ',':
        s.next()
        args.append(p_test(s))
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    s.expect('`')
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    if len(args) == 1:
        arg = args[0]
    else:
        arg = ExprNodes.TupleNode(pos, args = args)
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    return ExprNodes.BackquoteNode(pos, arg = arg)

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def p_simple_expr_list(s, expr=None):
    exprs = expr is not None and [expr] or []
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    while s.sy not in expr_terminators:
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        exprs.append( p_test(s) )
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        if s.sy != ',':
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            break
        s.next()
    return exprs

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def p_test_or_starred_expr_list(s, expr=None):
    exprs = expr is not None and [expr] or []
    while s.sy not in expr_terminators:
        exprs.append( p_test_or_starred_expr(s) )
        if s.sy != ',':
            break
        s.next()
    return exprs
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#testlist: test (',' test)* [',']

def p_testlist(s):
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    pos = s.position()
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    expr = p_test(s)
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    if s.sy == ',':
        s.next()
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        exprs = p_simple_expr_list(s, expr)
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        return ExprNodes.TupleNode(pos, args = exprs)
    else:
        return expr

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# testlist_star_expr: (test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )
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def p_testlist_star_expr(s):
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    pos = s.position()
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    expr = p_test_or_starred_expr(s)
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    if s.sy == ',':
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        s.next()
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        exprs = p_test_or_starred_expr_list(s, expr)
        return ExprNodes.TupleNode(pos, args = exprs)
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    else:
        return expr

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# testlist_comp: (test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )

def p_testlist_comp(s):
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    pos = s.position()
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    expr = p_test_or_starred_expr(s)
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    if s.sy == ',':
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        s.next()
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        exprs = p_test_or_starred_expr_list(s, expr)
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        return ExprNodes.TupleNode(pos, args = exprs)
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    elif s.sy == 'for':
        return p_genexp(s, expr)
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    else:
        return expr
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def p_genexp(s, expr):
    # s.sy == 'for'
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    loop = p_comp_for(s, Nodes.ExprStatNode(
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        expr.pos, expr = ExprNodes.YieldExprNode(expr.pos, arg=expr)))
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    return ExprNodes.GeneratorExpressionNode(expr.pos, loop=loop)

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expr_terminators = (')', ']', '}', ':', '=', 'NEWLINE')

#-------------------------------------------------------
#
#   Statements
#
#-------------------------------------------------------

def p_global_statement(s):
    # assume s.sy == 'global'
    pos = s.position()
    s.next()
    names = p_ident_list(s)
    return Nodes.GlobalNode(pos, names = names)

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def p_nonlocal_statement(s):
    pos = s.position()
    s.next()
    names = p_ident_list(s)
    return Nodes.NonlocalNode(pos, names = names)

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def p_expression_or_assignment(s):
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    expr_list = [p_testlist_star_expr(s)]
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    while s.sy == '=':
        s.next()
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        if s.sy == 'yield':
            expr = p_yield_expression(s)
        else:
            expr = p_testlist_star_expr(s)
        expr_list.append(expr)
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    if len(expr_list) == 1:
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        if re.match(r"([+*/\%^\&|-]|<<|>>|\*\*|//)=", s.sy):
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            lhs = expr_list[0]
            if not isinstance(lhs, (ExprNodes.AttributeNode, ExprNodes.IndexNode, ExprNodes.NameNode) ):
                error(lhs.pos, "Illegal operand for inplace operation.")
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            operator = s.sy[:-1]
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            s.next()
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            if s.sy == 'yield':
                rhs = p_yield_expression(s)
            else:
                rhs = p_testlist(s)
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            return Nodes.InPlaceAssignmentNode(lhs.pos, operator = operator, lhs = lhs, rhs = rhs)
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        expr = expr_list[0]
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        if isinstance(expr, (ExprNodes.UnicodeNode, ExprNodes.StringNode, ExprNodes.BytesNode)):
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            return Nodes.PassStatNode(expr.pos)
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        else:
            return Nodes.ExprStatNode(expr.pos, expr = expr)
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    rhs = expr_list[-1]
    if len(expr_list) == 2:
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        return Nodes.SingleAssignmentNode(rhs.pos,
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            lhs = expr_list[0], rhs = rhs)
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    else:
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        return Nodes.CascadedAssignmentNode(rhs.pos,
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            lhs_list = expr_list[:-1], rhs = rhs)
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def p_print_statement(s):
    # s.sy == 'print'
    pos = s.position()
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    ends_with_comma = 0
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    s.next()
    if s.sy == '>>':
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        s.next()
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        stream = p_test(s)
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        if s.sy == ',':
            s.next()
            ends_with_comma = s.sy in ('NEWLINE', 'EOF')
    else:
        stream = None
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    args = []
    if s.sy not in ('NEWLINE', 'EOF'):
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        args.append(p_test(s))
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        while s.sy == ',':
            s.next()
            if s.sy in ('NEWLINE', 'EOF'):
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                ends_with_comma = 1
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                break
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            args.append(p_test(s))
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    arg_tuple = ExprNodes.TupleNode(pos, args = args)
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    return Nodes.PrintStatNode(pos,
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        arg_tuple = arg_tuple, stream = stream,
        append_newline = not ends_with_comma)
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def p_exec_statement(s):
    # s.sy == 'exec'
    pos = s.position()
    s.next()
    args = [ p_bit_expr(s) ]
    if s.sy == 'in':
        s.next()
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        args.append(p_test(s))
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        if s.sy == ',':
            s.next()
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            args.append(p_test(s))
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    else:
        error(pos, "'exec' currently requires a target mapping (globals/locals)")
    return Nodes.ExecStatNode(pos, args = args)

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def p_del_statement(s):
    # s.sy == 'del'
    pos = s.position()
    s.next()
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    # FIXME: 'exprlist' in Python
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    args = p_simple_expr_list(s)
    return Nodes.DelStatNode(pos, args = args)

def p_pass_statement(s, with_newline = 0):
    pos = s.position()
    s.expect('pass')
    if with_newline:
        s.expect_newline("Expected a newline")
    return Nodes.PassStatNode(pos)

def p_break_statement(s):
    # s.sy == 'break'
    pos = s.position()
    s.next()
    return Nodes.BreakStatNode(pos)

def p_continue_statement(s):
    # s.sy == 'continue'
    pos = s.position()
    s.next()
    return Nodes.ContinueStatNode(pos)

def p_return_statement(s):
    # s.sy == 'return'
    pos = s.position()
    s.next()
    if s.sy not in statement_terminators:
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        value = p_testlist(s)
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    else:
        value = None
    return Nodes.ReturnStatNode(pos, value = value)

def p_raise_statement(s):
    # s.sy == 'raise'
    pos = s.position()
    s.next()
    exc_type = None
    exc_value = None
    exc_tb = None
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    cause = None
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    if s.sy not in statement_terminators:
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        exc_type = p_test(s)
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        if s.sy == ',':
            s.next()
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            exc_value = p_test(s)
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            if s.sy == ',':
                s.next()
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                exc_tb = p_test(s)
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        elif s.sy == 'from':
            s.next()
            cause = p_test(s)
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    if exc_type or exc_value or exc_tb:
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        return Nodes.RaiseStatNode(pos,
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            exc_type = exc_type,
            exc_value = exc_value,
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            exc_tb = exc_tb,
            cause = cause)
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    else:
        return Nodes.ReraiseStatNode(pos)
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def p_import_statement(s):
    # s.sy in ('import', 'cimport')
    pos = s.position()
    kind = s.sy
    s.next()
    items = [p_dotted_name(s, as_allowed = 1)]
    while s.sy == ',':
        s.next()
        items.append(p_dotted_name(s, as_allowed = 1))
    stats = []
    for pos, target_name, dotted_name, as_name in items:
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        dotted_name = EncodedString(dotted_name)
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        if kind == 'cimport':
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            stat = Nodes.CImportStatNode(pos,
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                module_name = dotted_name,
                as_name = as_name)
        else:
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            if as_name and "." in dotted_name:
                name_list = ExprNodes.ListNode(pos, args = [
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                        ExprNodes.IdentifierStringNode(pos, value = EncodedString("*"))])
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            else:
                name_list = None
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            stat = Nodes.SingleAssignmentNode(pos,
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                lhs = ExprNodes.NameNode(pos,
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                    name = as_name or target_name),
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                rhs = ExprNodes.ImportNode(pos,
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                    module_name = ExprNodes.IdentifierStringNode(
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                        pos, value = dotted_name),
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                    level = None,
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                    name_list = name_list))
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        stats.append(stat)
    return Nodes.StatListNode(pos, stats = stats)

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def p_from_import_statement(s, first_statement = 0):
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    # s.sy == 'from'
    pos = s.position()
    s.next()
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    if s.sy == '.':
        # count relative import level
        level = 0
        while s.sy == '.':
            level += 1
            s.next()
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        if s.sy == 'cimport':
            s.error("Relative cimport is not supported yet")
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    else:
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        level = None
    if level is not None and s.sy == 'import':
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        # we are dealing with "from .. import foo, bar"
        dotted_name_pos, dotted_name = s.position(), ''
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    elif level is not None and s.sy == 'cimport':
        # "from .. cimport"
        s.error("Relative cimport is not supported yet")
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    else:
        (dotted_name_pos, _, dotted_name, _) = \
            p_dotted_name(s, as_allowed = 0)
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    if s.sy in ('import', 'cimport'):
        kind = s.sy
        s.next()
    else:
        s.error("Expected 'import' or 'cimport'")
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    is_cimport = kind == 'cimport'
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    is_parenthesized = False
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    if s.sy == '*':
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        imported_names = [(s.position(), "*", None, None)]
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        s.next()
    else:
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        if s.sy == '(':
            is_parenthesized = True
            s.next()
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        imported_names = [p_imported_name(s, is_cimport)]
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    while s.sy == ',':
        s.next()
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        if is_parenthesized and s.sy == ')':
            break
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        imported_names.append(p_imported_name(s, is_cimport))
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    if is_parenthesized:
        s.expect(')')
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    dotted_name = EncodedString(dotted_name)
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    if dotted_name == '__future__':
        if not first_statement:
            s.error("from __future__ imports must occur at the beginning of the file")
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        elif level is not None:
            s.error("invalid syntax")
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        else:
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            for (name_pos, name, as_name, kind) in imported_names:
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                if name == "braces":
                    s.error("not a chance", name_pos)
                    break
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                try:
                    directive = getattr(Future, name)
                except AttributeError:
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                    s.error("future feature %s is not defined" % name, name_pos)
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                    break
                s.context.future_directives.add(directive)
        return Nodes.PassStatNode(pos)
    elif kind == 'cimport':
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        return Nodes.FromCImportStatNode(pos,
            module_name = dotted_name,
            imported_names = imported_names)
    else:
        imported_name_strings = []
        items = []
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        for (name_pos, name, as_name, kind) in imported_names:
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            encoded_name = EncodedString(name)
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            imported_name_strings.append(
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                ExprNodes.IdentifierStringNode(name_pos, value = encoded_name))
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            items.append(
                (name,
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                 ExprNodes.NameNode(name_pos,
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                                    name = as_name or name)))
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        import_list = ExprNodes.ListNode(
            imported_names[0][0], args = imported_name_strings)
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        dotted_name = EncodedString(dotted_name)
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        return Nodes.FromImportStatNode(pos,
            module = ExprNodes.ImportNode(dotted_name_pos,
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                module_name = ExprNodes.IdentifierStringNode(pos, value = dotted_name),
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                level = level,
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                name_list = import_list),
            items = items)

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imported_name_kinds = ('class', 'struct', 'union')

def p_imported_name(s, is_cimport):
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    pos = s.position()
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    kind = None
    if is_cimport and s.systring in imported_name_kinds:
        kind = s.systring
        s.next()
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    name = p_ident(s)
    as_name = p_as_name(s)
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    return (pos, name, as_name, kind)
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def p_dotted_name(s, as_allowed):
    pos = s.position()
    target_name = p_ident(s)
    as_name = None
    names = [target_name]
    while s.sy == '.':
        s.next()
        names.append(p_ident(s))
    if as_allowed:
        as_name = p_as_name(s)
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    return (pos, target_name, u'.'.join(names), as_name)
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def p_as_name(s):
    if s.sy == 'IDENT' and s.systring == 'as':
        s.next()
        return p_ident(s)
    else:
        return None

def p_assert_statement(s):
    # s.sy == 'assert'
    pos = s.position()
    s.next()
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    cond = p_test(s)
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    if s.sy == ',':
        s.next()
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        value = p_test(s)
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    else:
        value = None
    return Nodes.AssertStatNode(pos, cond = cond, value = value)

statement_terminators = (';', 'NEWLINE', 'EOF')

def p_if_statement(s):
    # s.sy == 'if'
    pos = s.position()
    s.next()
    if_clauses = [p_if_clause(s)]
    while s.sy == 'elif':
        s.next()
        if_clauses.append(p_if_clause(s))
    else_clause = p_else_clause(s)
    return Nodes.IfStatNode(pos,
        if_clauses = if_clauses, else_clause = else_clause)

def p_if_clause(s):
    pos = s.position()
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    test = p_test(s)
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    body = p_suite(s)
    return Nodes.IfClauseNode(pos,
        condition = test, body = body)

def p_else_clause(s):
    if s.sy == 'else':
        s.next()
        return p_suite(s)
    else:
        return None

def p_while_statement(s):
    # s.sy == 'while'
    pos = s.position()
    s.next()
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    test = p_test(s)
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    body = p_suite(s)
    else_clause = p_else_clause(s)
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    return Nodes.WhileStatNode(pos,
        condition = test, body = body,
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        else_clause = else_clause)

def p_for_statement(s):
    # s.sy == 'for'
    pos = s.position()
    s.next()
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    kw = p_for_bounds(s, allow_testlist=True)
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    body = p_suite(s)
    else_clause = p_else_clause(s)
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    kw.update(body = body, else_clause = else_clause)
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    return Nodes.ForStatNode(pos, **kw)
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def p_for_bounds(s, allow_testlist=True):
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    target = p_for_target(s)
    if s.sy == 'in':
        s.next()
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        iterator = p_for_iterator(s, allow_testlist)
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        return dict( target = target, iterator = iterator )
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    elif not s.in_python_file:
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        if s.sy == 'from':
            s.next()
            bound1 = p_bit_expr(s)
        else:
            # Support shorter "for a <= x < b" syntax
            bound1, target = target, None
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        rel1 = p_for_from_relation(s)
        name2_pos = s.position()
        name2 = p_ident(s)
        rel2_pos = s.position()
        rel2 = p_for_from_relation(s)
        bound2 = p_bit_expr(s)
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        step = p_for_from_step(s)
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        if target is None:
            target = ExprNodes.NameNode(name2_pos, name = name2)
        else:
            if not target.is_name:
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                error(target.pos,
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                    "Target of for-from statement must be a variable name")
            elif name2 != target.name:
                error(name2_pos,
                    "Variable name in for-from range does not match target")
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        if rel1[0] != rel2[0]:
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            error(rel2_pos,
                "Relation directions in for-from do not match")
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        return dict(target = target,
                    bound1 = bound1,
                    relation1 = rel1,
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                    relation2 = rel2,
                    bound2 = bound2,
                    step = step,
                    )
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    else:
        s.expect('in')
        return {}
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def p_for_from_relation(s):
    if s.sy in inequality_relations:
        op = s.sy
        s.next()
        return op
    else:
        s.error("Expected one of '<', '<=', '>' '>='")
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def p_for_from_step(s):
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    if s.sy == 'IDENT' and s.systring == 'by':
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        s.next()
        step = p_bit_expr(s)
        return step
    else:
        return None
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inequality_relations = ('<', '<=', '>', '>=')

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def p_target(s, terminator):
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    pos = s.position()
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    expr = p_starred_expr(s)
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    if s.sy == ',':
        s.next()
        exprs = [expr]
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        while s.sy != terminator:
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            exprs.append(p_starred_expr(s))
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            if s.sy != ',':
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                break
            s.next()
        return ExprNodes.TupleNode(pos, args = exprs)
    else:
        return expr

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def p_for_target(s):
    return p_target(s, 'in')

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def p_for_iterator(s, allow_testlist=True):
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    pos = s.position()
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    if allow_testlist:
        expr = p_testlist(s)
    else:
        expr = p_or_test(s)
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    return ExprNodes.IteratorNode(pos, sequence = expr)

def p_try_statement(s):
    # s.sy == 'try'
    pos = s.position()
    s.next()
    body = p_suite(s)
    except_clauses = []
    else_clause = None
    if s.sy in ('except', 'else'):
        while s.sy == 'except':
            except_clauses.append(p_except_clause(s))
        if s.sy == 'else':
            s.next()
            else_clause = p_suite(s)
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        body = Nodes.TryExceptStatNode(pos,
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            body = body, except_clauses = except_clauses,
            else_clause = else_clause)
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        if s.sy != 'finally':
            return body
        # try-except-finally is equivalent to nested try-except/try-finally
    if s.sy == 'finally':
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        s.next()
        finally_clause = p_suite(s)
        return Nodes.TryFinallyStatNode(pos,
            body = body, finally_clause = finally_clause)
    else:
        s.error("Expected 'except' or 'finally'")

def p_except_clause(s):
    # s.sy == 'except'
    pos = s.position()
    s.next()
    exc_type = None
    exc_value = None
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    if s.sy != ':':
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        exc_type = p_test(s)
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        # normalise into list of single exception tests
        if isinstance(exc_type, ExprNodes.TupleNode):
            exc_type = exc_type.args
        else:
            exc_type = [exc_type]
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        if s.sy == ',' or (s.sy == 'IDENT' and s.systring == 'as'):
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            s.next()
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            exc_value = p_test(s)
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        elif s.sy == 'IDENT' and s.systring == 'as':
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            # Py3 syntax requires a name here
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            s.next()
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            pos2 = s.position()
            name = p_ident(s)
            exc_value = ExprNodes.NameNode(pos2, name = name)
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    body = p_suite(s)
    return Nodes.ExceptClauseNode(pos,
        pattern = exc_type, target = exc_value, body = body)

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def p_include_statement(s, ctx):
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    pos = s.position()
    s.next() # 'include'
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    unicode_include_file_name = p_string_literal(s, 'u')[2]
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    s.expect_newline("Syntax error in include statement")
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    if s.compile_time_eval:
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        include_file_name = unicode_include_file_name
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        include_file_path = s.context.find_include_file(include_file_name, pos)
        if include_file_path:
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            s.included_files.append(include_file_name)
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            f = Utils.open_source_file(include_file_path, mode="rU")
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            source_desc = FileSourceDescriptor(include_file_path)
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            s2 = PyrexScanner(f, source_desc, s, source_encoding=f.encoding, parse_comments=s.parse_comments)
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            try:
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                tree = p_statement_list(s2, ctx)
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            finally:
                f.close()
            return tree
        else:
            return None
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    else:
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        return Nodes.PassStatNode(pos)

def p_with_statement(s):
    s.next() # 'with'
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    if s.systring == 'template' and not s.in_python_file:
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        node = p_with_template(s)
    else:
        node = p_with_items(s)
    return node

def p_with_items(s):
    pos = s.position()
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    if not s.in_python_file and s.sy == 'IDENT' and s.systring in ('nogil', 'gil'):
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        state = s.systring
        s.next()
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        if s.sy == ',':
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            s.next()
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            body = p_with_items(s)
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        else:
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            body = p_suite(s)
        return Nodes.GILStatNode(pos, state = state, body = body)
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    else:
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        manager = p_test(s)
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        target = None
        if s.sy == 'IDENT' and s.systring == 'as':
            s.next()
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            target = p_starred_expr(s)
        if s.sy == ',':
            s.next()
            body = p_with_items(s)
        else:
            body = p_suite(s)
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    return Nodes.WithStatNode(pos, manager = manager,
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                              target = target, body = body)
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def p_with_template(s):
    pos = s.position()
    templates = []
    s.next()
    s.expect('[')
    templates.append(s.systring)
    s.next()
    while s.systring == ',':
        s.next()
        templates.append(s.systring)
        s.next()
    s.expect(']')
    if s.sy == ':':
        s.next()
        s.expect_newline("Syntax error in template function declaration")
        s.expect_indent()
        body_ctx = Ctx()
        body_ctx.templates = templates
        func_or_var = p_c_func_or_var_declaration(s, pos, body_ctx)
        s.expect_dedent()
        return func_or_var
    else:
        error(pos, "Syntax error in template function declaration")

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def p_simple_statement(s, first_statement = 0):
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    #print "p_simple_statement:", s.sy, s.systring ###
    if s.sy == 'global':
        node = p_global_statement(s)
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    elif s.sy == 'nonlocal':
        node = p_nonlocal_statement(s)
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    elif s.sy == 'print':
        node = p_print_statement(s)
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    elif s.sy == 'exec':
        node = p_exec_statement(s)
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    elif s.sy == 'del':
        node = p_del_statement(s)
    elif s.sy == 'break':
        node = p_break_statement(s)
    elif s.sy == 'continue':
        node = p_continue_statement(s)
    elif s.sy == 'return':
        node = p_return_statement(s)
    elif s.sy == 'raise':
        node = p_raise_statement(s)
    elif s.sy in ('import', 'cimport'):
        node = p_import_statement(s)
    elif s.sy == 'from':
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        node = p_from_import_statement(s, first_statement = first_statement)
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    elif s.sy == 'yield':
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        node = p_yield_statement(s)
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    elif s.sy == 'assert':
        node = p_assert_statement(s)
    elif s.sy == 'pass':
        node = p_pass_statement(s)
    else:
        node = p_expression_or_assignment(s)
    return node

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def p_simple_statement_list(s, ctx, first_statement = 0):
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    # Parse a series of simple statements on one line
    # separated by semicolons.
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    stat = p_simple_statement(s, first_statement = first_statement)
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    pos = stat.pos
    stats = []
    if not isinstance(stat, Nodes.PassStatNode):
        stats.append(stat)
    while s.sy == ';':
        #print "p_simple_statement_list: maybe more to follow" ###
        s.next()
        if s.sy in ('NEWLINE', 'EOF'):
            break
        stat = p_simple_statement(s, first_statement = first_statement)
        if isinstance(stat, Nodes.PassStatNode):
            continue
        stats.append(stat)
        first_statement = False

    if not stats:
        stat = Nodes.PassStatNode(pos)
    elif len(stats) == 1:
        stat = stats[0]
    else:
        stat = Nodes.StatListNode(pos, stats = stats)
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    s.expect_newline("Syntax error in simple statement list")
    return stat

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def p_compile_time_expr(s):
    old = s.compile_time_expr
    s.compile_time_expr = 1
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    expr = p_testlist(s)
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    s.compile_time_expr = old
    return expr

def p_DEF_statement(s):
    pos = s.position()
    denv = s.compile_time_env
    s.next() # 'DEF'
    name = p_ident(s)
    s.expect('=')
    expr = p_compile_time_expr(s)
    value = expr.compile_time_value(denv)
    #print "p_DEF_statement: %s = %r" % (name, value) ###
    denv.declare(name, value)
    s.expect_newline()
    return Nodes.PassStatNode(pos)

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def p_IF_statement(s, ctx):
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    pos = s.position()
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    saved_eval = s.compile_time_eval
    current_eval = saved_eval
    denv = s.compile_time_env
    result = None
    while 1:
        s.next() # 'IF' or 'ELIF'
        expr = p_compile_time_expr(s)
        s.compile_time_eval = current_eval and bool(expr.compile_time_value(denv))
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        body = p_suite(s, ctx)
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        if s.compile_time_eval:
            result = body
            current_eval = 0
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        if s.sy != 'ELIF':
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            break
    if s.sy == 'ELSE':
        s.next()
        s.compile_time_eval = current_eval
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        body = p_suite(s, ctx)
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        if current_eval:
            result = body
    if not result:
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        result = Nodes.PassStatNode(pos)
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    s.compile_time_eval = saved_eval
    return result

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def p_statement(s, ctx, first_statement = 0):
    cdef_flag = ctx.cdef_flag
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    decorators = None
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    if s.sy == 'ctypedef':
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        if ctx.level not in ('module', 'module_pxd'):
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            s.error("ctypedef statement not allowed here")
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        #if ctx.api:
        #    error(s.position(), "'api' not allowed with 'ctypedef'")
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        return p_ctypedef_statement(s, ctx)
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    elif s.sy == 'DEF':
        return p_DEF_statement(s)
    elif s.sy == 'IF':
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        return p_IF_statement(s, ctx)
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    elif s.sy == 'DECORATOR':
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        if ctx.level not in ('module', 'class', 'c_class', 'function', 'property', 'module_pxd', 'c_class_pxd', 'other'):
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            s.error('decorator not allowed here')
        s.level = ctx.level
        decorators = p_decorators(s)
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        if s.sy not in ('def', 'cdef', 'cpdef', 'class'):
            s.error("Decorators can only be followed by functions or classes")
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    elif s.sy == 'pass' and cdef_flag:
        # empty cdef block
        return p_pass_statement(s, with_newline = 1)
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    overridable = 0
    if s.sy == 'cdef':
        cdef_flag = 1
        s.next()
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    elif s.sy == 'cpdef':
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        cdef_flag = 1
        overridable = 1
        s.next()
    if cdef_flag:
        if ctx.level not in ('module', 'module_pxd', 'function', 'c_class', 'c_class_pxd'):
            s.error('cdef statement not allowed here')
        s.level = ctx.level
        node = p_cdef_statement(s, ctx(overridable = overridable))
        if decorators is not None:
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            if not isinstance(node, (Nodes.CFuncDefNode, Nodes.CVarDefNode, Nodes.CClassDefNode)):
                s.error("Decorators can only be followed by functions or classes")
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            node.decorators = decorators
        return node
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    else:
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        if ctx.api:
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            s.error("'api' not allowed with this statement")
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        elif s.sy == 'def':
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            # def statements aren't allowed in pxd files, except
            # as part of a cdef class
            if ('pxd' in ctx.level) and (ctx.level != 'c_class_pxd'):
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                s.error('def statement not allowed here')
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            s.level = ctx.level
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            return p_def_statement(s, decorators)
        elif s.sy == 'class':
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            if ctx.level not in ('module', 'function', 'class', 'other'):
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                s.error("class definition not allowed here")
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            return p_class_statement(s, decorators)
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        elif s.sy == 'include':
            if ctx.level not in ('module', 'module_pxd'):
                s.error("include statement not allowed here")
            return p_include_statement(s, ctx)
        elif ctx.level == 'c_class' and s.sy == 'IDENT' and s.systring == 'property':
            return p_property_decl(s)
        elif s.sy == 'pass' and ctx.level != 'property':
            return p_pass_statement(s, with_newline = 1)
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        else:
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            if ctx.level in ('c_class_pxd', 'property'):
                s.error("Executable statement not allowed here")
            if s.sy == 'if':
                return p_if_statement(s)
            elif s.sy == 'while':
                return p_while_statement(s)
            elif s.sy == 'for':
                return p_for_statement(s)
            elif s.sy == 'try':
                return p_try_statement(s)
            elif s.sy == 'with':
                return p_with_statement(s)
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            else:
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                return p_simple_statement_list(
                    s, ctx, first_statement = first_statement)
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def p_statement_list(s, ctx, first_statement = 0):
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    # Parse a series of statements separated by newlines.
    pos = s.position()
    stats = []
    while s.sy not in ('DEDENT', 'EOF'):
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        stat = p_statement(s, ctx, first_statement = first_statement)
        if isinstance(stat, Nodes.PassStatNode):
            continue
        stats.append(stat)
        first_statement = False
    if not stats:
        return Nodes.PassStatNode(pos)
    elif len(stats) == 1:
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        return stats[0]
    else:
        return Nodes.StatListNode(pos, stats = stats)
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def p_suite(s, ctx = Ctx(), with_doc = 0, with_pseudo_doc = 0):
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    pos = s.position()
    s.expect(':')
    doc = None
    stmts = []
    if s.sy == 'NEWLINE':
        s.next()
        s.expect_indent()
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        if with_doc or with_pseudo_doc:
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            doc = p_doc_string(s)
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        body = p_statement_list(s, ctx)
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        s.expect_dedent()
    else:
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        if ctx.api:
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            s.error("'api' not allowed with this statement")
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        if ctx.level in ('module', 'class', 'function', 'other'):
            body = p_simple_statement_list(s, ctx)
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        else:
            body = p_pass_statement(s)
            s.expect_newline("Syntax error in declarations")
    if with_doc:
        return doc, body
    else:
        return body

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def p_positional_and_keyword_args(s, end_sy_set, templates = None):
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    """
    Parses positional and keyword arguments. end_sy_set
    should contain any s.sy that terminate the argument list.
    Argument expansion (* and **) are not allowed.

    Returns: (positional_args, keyword_args)
    """
    positional_args = []
    keyword_args = []
    pos_idx = 0

    while s.sy not in end_sy_set:
        if s.sy == '*' or s.sy == '**':
            s.error('Argument expansion not allowed here.')

        parsed_type = False
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        if s.sy == 'IDENT' and s.peek()[0] == '=':
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            ident = s.systring
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            s.next() # s.sy is '='
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            s.next()
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            if looking_at_expr(s):
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                arg = p_test(s)
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            else:
                base_type = p_c_base_type(s, templates = templates)
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                declarator = p_c_declarator(s, empty = 1)
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                arg = Nodes.CComplexBaseTypeNode(base_type.pos,
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                    base_type = base_type, declarator = declarator)
                parsed_type = True
            keyword_node = ExprNodes.IdentifierStringNode(
                arg.pos, value = EncodedString(ident))
            keyword_args.append((keyword_node, arg))
            was_keyword = True
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        else:
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            if looking_at_expr(s):
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                arg = p_test(s)
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            else:
                base_type = p_c_base_type(s, templates = templates)
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                declarator = p_c_declarator(s, empty = 1)
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                arg = Nodes.CComplexBaseTypeNode(base_type.pos,
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                    base_type = base_type, declarator = declarator)
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                parsed_type = True
            positional_args.append(arg)
            pos_idx += 1
            if len(keyword_args) > 0:
                s.error("Non-keyword arg following keyword arg",
                        pos = arg.pos)

        if s.sy != ',':
            if s.sy not in end_sy_set:
                if parsed_type:
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                    s.error("Unmatched %s" % " or ".join(end_sy_set))
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            break
        s.next()
    return positional_args, keyword_args

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def p_c_base_type(s, self_flag = 0, nonempty = 0, templates = None):
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    # If self_flag is true, this is the base type for the
    # self argument of a C method of an extension type.
    if s.sy == '(':
        return p_c_complex_base_type(s)
    else:
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        return p_c_simple_base_type(s, self_flag, nonempty = nonempty, templates = templates)
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def p_calling_convention(s):
    if s.sy == 'IDENT' and s.systring in calling_convention_words:
        result = s.systring
        s.next()
        return result
    else:
        return ""

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calling_convention_words = ("__stdcall", "__cdecl", "__fastcall")
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def p_c_complex_base_type(s):
    # s.sy == '('
    pos = s.position()
    s.next()
    base_type = p_c_base_type(s)
    declarator = p_c_declarator(s, empty = 1)
    s.expect(')')
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    return Nodes.CComplexBaseTypeNode(pos,
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        base_type = base_type, declarator = declarator)

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def p_c_simple_base_type(s, self_flag, nonempty, templates = None):
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    #print "p_c_simple_base_type: self_flag =", self_flag, nonempty
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    is_basic = 0
    signed = 1
    longness = 0
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    complex = 0
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    module_path = []
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    pos = s.position()
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    if not s.sy == 'IDENT':
        error(pos, "Expected an identifier, found '%s'" % s.sy)
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    if looking_at_base_type(s):
        #print "p_c_simple_base_type: looking_at_base_type at", s.position()
        is_basic = 1
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        if s.sy == 'IDENT' and s.systring in special_basic_c_types:
            signed, longness = special_basic_c_types[s.systring]
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            name = s.systring
            s.next()
        else:
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            signed, longness = p_sign_and_longness(s)
            if s.sy == 'IDENT' and s.systring in basic_c_type_names:
                name = s.systring
                s.next()
            else:
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                name = 'int'  # long [int], short [int], long [int] complex, etc.
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        if s.sy == 'IDENT' and s.systring == 'complex':
            complex = 1
            s.next()
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    elif looking_at_dotted_name(s):
        #print "p_c_simple_base_type: looking_at_type_name at", s.position()
        name = s.systring
        s.next()
        while s.sy == '.':
            module_path.append(name)
            s.next()
            name = p_ident(s)
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    else:
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        name = s.systring
        s.next()
        if nonempty and s.sy != 'IDENT':
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            # Make sure this is not a declaration of a variable or function.
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            if s.sy == '(':
                s.next()
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                if s.sy == '*' or s.sy == '**' or s.sy == '&':
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                    s.put_back('(', '(')
                else:
                    s.put_back('(', '(')
                    s.put_back('IDENT', name)
                    name = None
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            elif s.sy not in ('*', '**', '[', '&'):
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                s.put_back('IDENT', name)
                name = None
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    type_node = Nodes.CSimpleBaseTypeNode(pos,
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        name = name, module_path = module_path,
        is_basic_c_type = is_basic, signed = signed,
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        complex = complex, longness = longness,
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        is_self_arg = self_flag, templates = templates)
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    if s.sy == '[':
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        type_node = p_buffer_or_template(s, type_node, templates)
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    if s.sy == '.':
        s.next()
        name = p_ident(s)
        type_node = Nodes.CNestedBaseTypeNode(pos, base_type = type_node, name = name)
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    return type_node
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def p_buffer_or_template(s, base_type_node, templates):
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    # s.sy == '['
    pos = s.position()
    s.next()
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    # Note that buffer_positional_options_count=1, so the only positional argument is dtype.
    # For templated types, all parameters are types.
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    positional_args, keyword_args = (
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        p_positional_and_keyword_args(s, (']',), templates)
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    )
    s.expect(']')

    keyword_dict = ExprNodes.DictNode(pos,
        key_value_pairs = [
            ExprNodes.DictItemNode(pos=key.pos, key=key, value=value)
            for key, value in keyword_args
        ])
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    result = Nodes.TemplatedTypeNode(pos,
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        positional_args = positional_args,
        keyword_args = keyword_dict,
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        base_type_node = base_type_node)
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    return result
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def looking_at_name(s):
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    return s.sy == 'IDENT' and not s.systring in calling_convention_words

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def looking_at_expr(s):
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    if s.systring in base_type_start_words:
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        return False
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    elif s.sy == 'IDENT':
        is_type = False
        name = s.systring
        dotted_path = []
        s.next()
        while s.sy == '.':
            s.next()
            dotted_path.append(s.systring)
            s.expect('IDENT')
        saved = s.sy, s.systring
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        if s.sy == 'IDENT':
            is_type = True
        elif s.sy == '*' or s.sy == '**':
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            s.next()
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            is_type = s.sy in (')', ']')
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            s.put_back(*saved)
        elif s.sy == '(':
            s.next()
            is_type = s.sy == '*'
            s.put_back(*saved)
        elif s.sy == '[':
            s.next()
            is_type = s.sy == ']'
            s.put_back(*saved)
        dotted_path.reverse()
        for p in dotted_path:
            s.put_back('IDENT', p)
            s.put_back('.', '.')
        s.put_back('IDENT', name)
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        return not is_type
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    else:
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        return True
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def looking_at_base_type(s):
    #print "looking_at_base_type?", s.sy, s.systring, s.position()
    return s.sy == 'IDENT' and s.systring in base_type_start_words

def looking_at_dotted_name(s):
    if s.sy == 'IDENT':
        name = s.systring
        s.next()
        result = s.sy == '.'
        s.put_back('IDENT', name)
        return result
    else:
        return 0
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basic_c_type_names = ("void", "char", "int", "float", "double", "bint")

special_basic_c_types = {
    # name : (signed, longness)
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    "Py_UNICODE" : (0, 0),
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    "Py_UCS4"    : (0, 0),
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    "Py_ssize_t" : (2, 0),
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    "ssize_t"    : (2, 0),
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    "size_t"     : (0, 0),
}
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sign_and_longness_words = ("short", "long", "signed", "unsigned")

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base_type_start_words = \
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    basic_c_type_names + sign_and_longness_words + tuple(special_basic_c_types)
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def p_sign_and_longness(s):
    signed = 1
    longness = 0
    while s.sy == 'IDENT' and s.systring in sign_and_longness_words:
        if s.systring == 'unsigned':
            signed = 0
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        elif s.systring == 'signed':
            signed = 2
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        elif s.systring == 'short':
            longness = -1
        elif s.systring == 'long':
            longness += 1
        s.next()
    return signed, longness

def p_opt_cname(s):
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    literal = p_opt_string_literal(s, 'u')
    if literal is not None:
        cname = EncodedString(literal)
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        cname.encoding = s.source_encoding
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    else:
        cname = None
    return cname

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def p_c_declarator(s, ctx = Ctx(), empty = 0, is_type = 0, cmethod_flag = 0,
                   assignable = 0, nonempty = 0,
                   calling_convention_allowed = 0):
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    # If empty is true, the declarator must be empty. If nonempty is true,
    # the declarator must be nonempty. Otherwise we don't care.
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    # If cmethod_flag is true, then if this declarator declares
    # a function, it's a C method of an extension type.
    pos = s.position()
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    if s.sy == '(':
        s.next()
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        if s.sy == ')' or looking_at_name(s):
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            base = Nodes.CNameDeclaratorNode(pos, name = EncodedString(u""), cname = None)
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            result = p_c_func_declarator(s, pos, ctx, base, cmethod_flag)
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        else:
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            result = p_c_declarator(s, ctx, empty = empty, is_type = is_type,
                                    cmethod_flag = cmethod_flag,
                                    nonempty = nonempty,
                                    calling_convention_allowed = 1)
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            s.expect(')')
    else:
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        result = p_c_simple_declarator(s, ctx, empty, is_type, cmethod_flag,
                                       assignable, nonempty)
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    if not calling_convention_allowed and result.calling_convention and s.sy != '(':
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        error(s.position(), "%s on something that is not a function"
            % result.calling_convention)
    while s.sy in ('[', '('):
        pos = s.position()
        if s.sy == '[':
            result = p_c_array_declarator(s, result)
        else: # sy == '('
            s.next()
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            result = p_c_func_declarator(s, pos, ctx, result, cmethod_flag)
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        cmethod_flag = 0
    return result

def p_c_array_declarator(s, base):
    pos = s.position()
    s.next() # '['
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    if s.sy != ']':
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        dim = p_testlist(s)
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    else:
        dim = None
    s.expect(']')
    return Nodes.CArrayDeclaratorNode(pos, base = base, dimension = dim)

2176
def p_c_func_declarator(s, pos, ctx, base, cmethod_flag):
2177
    #  Opening paren has already been skipped
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    args = p_c_arg_list(s, ctx, cmethod_flag = cmethod_flag,
                        nonempty_declarators = 0)
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    ellipsis = p_optional_ellipsis(s)
    s.expect(')')
    nogil = p_nogil(s)
    exc_val, exc_check = p_exception_value_clause(s)
    with_gil = p_with_gil(s)
2185
    return Nodes.CFuncDeclaratorNode(pos,
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        base = base, args = args, has_varargs = ellipsis,
        exception_value = exc_val, exception_check = exc_check,
2188
        nogil = nogil or ctx.nogil or with_gil, with_gil = with_gil)
2189

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supported_overloaded_operators = set([
2191
    '+', '-', '*', '/', '%',
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    '++', '--', '~', '|', '&', '^', '<<', '>>', ',',
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    '==', '!=', '>=', '>', '<=', '<',
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    '[]', '()',
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])
2196

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def p_c_simple_declarator(s, ctx, empty, is_type, cmethod_flag,
                          assignable, nonempty):
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    pos = s.position()
    calling_convention = p_calling_convention(s)
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    if s.sy == '*':
        s.next()
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        base = p_c_declarator(s, ctx, empty = empty, is_type = is_type,
                              cmethod_flag = cmethod_flag,
                              assignable = assignable, nonempty = nonempty)
2206
        result = Nodes.CPtrDeclaratorNode(pos,
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            base = base)
    elif s.sy == '**': # scanner returns this as a single token
        s.next()
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        base = p_c_declarator(s, ctx, empty = empty, is_type = is_type,
                              cmethod_flag = cmethod_flag,
                              assignable = assignable, nonempty = nonempty)
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        result = Nodes.CPtrDeclaratorNode(pos,
            base = Nodes.CPtrDeclaratorNode(pos,
                base = base))
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    elif s.sy == '&':
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        s.next()
        base = p_c_declarator(s, ctx, empty = empty, is_type = is_type,
                              cmethod_flag = cmethod_flag,
                              assignable = assignable, nonempty = nonempty)
        result = Nodes.CReferenceDeclaratorNode(pos, base = base)
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    else:
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        rhs = None
        if s.sy == 'IDENT':
2225
            name = EncodedString(s.systring)
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            if empty:
                error(s.position(), "Declarator should be empty")
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            s.next()
2229
            cname = p_opt_cname(s)
2230
            if name != 'operator' and s.sy == '=' and assignable:
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                s.next()
2232
                rhs = p_test(s)
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        else:
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            if nonempty:
                error(s.position(), "Empty declarator")
            name = ""
            cname = None
2238
        if cname is None and ctx.namespace is not None and nonempty:
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            cname = ctx.namespace + "::" + name
2240
        if name == 'operator' and ctx.visibility == 'extern' and nonempty:
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            op = s.sy
2242
            if [1 for c in op if c in '+-*/<=>!%&|([^~,']:
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                s.next()
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                # Handle diphthong operators.
                if op == '(':
                    s.expect(')')
                    op = '()'
                elif op == '[':
                    s.expect(']')
                    op = '[]'
                if op in ['-', '+', '|', '&'] and s.sy == op:
                    op = op*2
                    s.next()
                if s.sy == '=':
                    op += s.sy
                    s.next()
                if op not in supported_overloaded_operators:
                    s.error("Overloading operator '%s' not yet supported." % op)
                name = name+op
2260
        result = Nodes.CNameDeclaratorNode(pos,
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            name = name, cname = cname, default = rhs)
2262
    result.calling_convention = calling_convention
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    return result

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def p_nogil(s):
    if s.sy == 'IDENT' and s.systring == 'nogil':
        s.next()
        return 1
    else:
        return 0

def p_with_gil(s):
    if s.sy == 'with':
        s.next()
        s.expect_keyword('gil')
        return 1
    else:
        return 0

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def p_exception_value_clause(s):
    exc_val = None
    exc_check = 0
    if s.sy == 'except':
        s.next()
        if s.sy == '*':
            exc_check = 1
            s.next()
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        elif s.sy == '+':
            exc_check = '+'
            s.next()
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            if s.sy == 'IDENT':
                name = s.systring
                s.next()
                exc_val = p_name(s, name)
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        else:
            if s.sy == '?':
                exc_check = 1
                s.next()
2299
            exc_val = p_test(s)
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    return exc_val, exc_check

c_arg_list_terminators = ('*', '**', '.', ')')

2304
def p_c_arg_list(s, ctx = Ctx(), in_pyfunc = 0, cmethod_flag = 0,
2305
                 nonempty_declarators = 0, kw_only = 0, annotated = 1):
2306 2307
    #  Comma-separated list of C argument declarations, possibly empty.
    #  May have a trailing comma.
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    args = []
2309 2310
    is_self_arg = cmethod_flag
    while s.sy not in c_arg_list_terminators:
2311
        args.append(p_c_arg_decl(s, ctx, in_pyfunc, is_self_arg,
2312 2313
            nonempty = nonempty_declarators, kw_only = kw_only,
            annotated = annotated))
2314 2315 2316 2317
        if s.sy != ',':
            break
        s.next()
        is_self_arg = 0
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    return args

def p_optional_ellipsis(s):
    if s.sy == '.':
        expect_ellipsis(s)
        return 1
    else:
        return 0

2327 2328
def p_c_arg_decl(s, ctx, in_pyfunc, cmethod_flag = 0, nonempty = 0,
                 kw_only = 0, annotated = 1):
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    pos = s.position()
2330
    not_none = or_none = 0
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    default = None
2332
    annotation = None
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    if s.in_python_file:
        # empty type declaration
        base_type = Nodes.CSimpleBaseTypeNode(pos,
            name = None, module_path = [],
            is_basic_c_type = 0, signed = 0,
            complex = 0, longness = 0,
            is_self_arg = cmethod_flag, templates = None)
    else:
        base_type = p_c_base_type(s, cmethod_flag, nonempty = nonempty)
2342
    declarator = p_c_declarator(s, ctx, nonempty = nonempty)
2343 2344
    if s.sy in ('not', 'or') and not s.in_python_file:
        kind = s.sy
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        s.next()
        if s.sy == 'IDENT' and s.systring == 'None':
            s.next()
        else:
            s.error("Expected 'None'")
        if not in_pyfunc:
2351 2352 2353
            error(pos, "'%s None' only allowed in Python functions" % kind)
        or_none = kind == 'or'
        not_none = kind == 'not'
2354 2355
    if annotated and s.sy == ':':
        s.next()
2356
        annotation = p_test(s)
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    if s.sy == '=':
        s.next()
2359 2360 2361
        if 'pxd' in s.level:
            if s.sy not in ['*', '?']:
                error(pos, "default values cannot be specified in pxd files, use ? or *")
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            default = ExprNodes.BoolNode(1)
2363 2364
            s.next()
        else:
2365
            default = p_test(s)
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    return Nodes.CArgDeclNode(pos,
        base_type = base_type,
        declarator = declarator,
        not_none = not_none,
2370
        or_none = or_none,
2371
        default = default,
2372
        annotation = annotation,
2373
        kw_only = kw_only)
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2375 2376 2377 2378 2379 2380 2381
def p_api(s):
    if s.sy == 'IDENT' and s.systring == 'api':
        s.next()
        return 1
    else:
        return 0

2382
def p_cdef_statement(s, ctx):
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2383
    pos = s.position()
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    ctx.visibility = p_visibility(s, ctx.visibility)
    ctx.api = ctx.api or p_api(s)
    if ctx.api:
        if ctx.visibility not in ('private', 'public'):
            error(pos, "Cannot combine 'api' with '%s'" % ctx.visibility)
    if (ctx.visibility == 'extern') and s.sy == 'from':
        return p_cdef_extern_block(s, pos, ctx)
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    elif s.sy == 'import':
        s.next()
2393
        return p_cdef_extern_block(s, pos, ctx)
2394
    elif p_nogil(s):
2395
        ctx.nogil = 1
2396 2397 2398 2399 2400 2401
        if ctx.overridable:
            error(pos, "cdef blocks cannot be declared cpdef")
        return p_cdef_block(s, ctx)
    elif s.sy == ':':
        if ctx.overridable:
            error(pos, "cdef blocks cannot be declared cpdef")
2402
        return p_cdef_block(s, ctx)
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2403
    elif s.sy == 'class':
2404
        if ctx.level not in ('module', 'module_pxd'):
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            error(pos, "Extension type definition not allowed here")
2406 2407
        if ctx.overridable:
            error(pos, "Extension types cannot be declared cpdef")
2408
        return p_c_class_definition(s, pos, ctx)
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    elif s.sy == 'IDENT' and s.systring == 'cppclass':
        if ctx.visibility != 'extern':
2411
            error(pos, "C++ classes need to be declared extern")
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2412
        return p_cpp_class_definition(s, pos, ctx)
2413
    elif s.sy == 'IDENT' and s.systring in ("struct", "union", "enum", "packed"):
2414
        if ctx.level not in ('module', 'module_pxd'):
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2415
            error(pos, "C struct/union/enum definition not allowed here")
2416 2417
        if ctx.overridable:
            error(pos, "C struct/union/enum cannot be declared cpdef")
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2418
        if s.systring == "enum":
2419
            return p_c_enum_definition(s, pos, ctx)
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2420
        else:
2421
            return p_c_struct_or_union_definition(s, pos, ctx)
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    else:
2423
        return p_c_func_or_var_declaration(s, pos, ctx)
2424

2425 2426
def p_cdef_block(s, ctx):
    return p_suite(s, ctx(cdef_flag = 1))
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2427

2428
def p_cdef_extern_block(s, pos, ctx):
2429 2430
    if ctx.overridable:
        error(pos, "cdef extern blocks cannot be declared cpdef")
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    include_file = None
    s.expect('from')
    if s.sy == '*':
        s.next()
    else:
2436
        include_file = p_string_literal(s, 'u')[2]
2437
    ctx = ctx(cdef_flag = 1, visibility = 'extern')
2438 2439
    if s.systring == "namespace":
        s.next()
2440
        ctx.namespace = p_string_literal(s, 'u')[2]
2441 2442 2443
    if p_nogil(s):
        ctx.nogil = 1
    body = p_suite(s, ctx)
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    return Nodes.CDefExternNode(pos,
        include_file = include_file,
2446
        body = body,
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        namespace = ctx.namespace)
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2448

2449
def p_c_enum_definition(s, pos, ctx):
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    # s.sy == ident 'enum'
    s.next()
    if s.sy == 'IDENT':
        name = s.systring
        s.next()
        cname = p_opt_cname(s)
2456 2457
        if cname is None and ctx.namespace is not None:
            cname = ctx.namespace + "::" + name
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    else:
        name = None
        cname = None
    items = None
    s.expect(':')
    items = []
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2464
    if s.sy != 'NEWLINE':
2465
        p_c_enum_line(s, ctx, items)
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    else:
        s.next() # 'NEWLINE'
        s.expect_indent()
        while s.sy not in ('DEDENT', 'EOF'):
2470
            p_c_enum_line(s, ctx, items)
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2471
        s.expect_dedent()
2472 2473 2474
    return Nodes.CEnumDefNode(
        pos, name = name, cname = cname, items = items,
        typedef_flag = ctx.typedef_flag, visibility = ctx.visibility,
2475
        api = ctx.api, in_pxd = ctx.level == 'module_pxd')
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2476

2477
def p_c_enum_line(s, ctx, items):
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2478
    if s.sy != 'pass':
2479
        p_c_enum_item(s, ctx, items)
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        while s.sy == ',':
            s.next()
            if s.sy in ('NEWLINE', 'EOF'):
                break
2484
            p_c_enum_item(s, ctx, items)
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    else:
        s.next()
    s.expect_newline("Syntax error in enum item list")

2489
def p_c_enum_item(s, ctx, items):
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    pos = s.position()
    name = p_ident(s)
    cname = p_opt_cname(s)
2493 2494
    if cname is None and ctx.namespace is not None:
        cname = ctx.namespace + "::" + name
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    value = None
    if s.sy == '=':
        s.next()
2498
        value = p_test(s)
2499
    items.append(Nodes.CEnumDefItemNode(pos,
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2500 2501
        name = name, cname = cname, value = value))

2502
def p_c_struct_or_union_definition(s, pos, ctx):
2503 2504 2505 2506
    packed = False
    if s.systring == 'packed':
        packed = True
        s.next()
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2507
        if s.sy != 'IDENT' or s.systring != 'struct':
2508
            s.expected('struct')
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    # s.sy == ident 'struct' or 'union'
    kind = s.systring
    s.next()
    name = p_ident(s)
    cname = p_opt_cname(s)
2514 2515
    if cname is None and ctx.namespace is not None:
        cname = ctx.namespace + "::" + name
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    attributes = None
    if s.sy == ':':
        s.next()
        s.expect('NEWLINE')
        s.expect_indent()
        attributes = []
2522
        body_ctx = Ctx()
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        while s.sy != 'DEDENT':
            if s.sy != 'pass':
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2525
                attributes.append(
2526
                    p_c_func_or_var_declaration(s, s.position(), body_ctx))
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            else:
                s.next()
                s.expect_newline("Expected a newline")
        s.expect_dedent()
    else:
        s.expect_newline("Syntax error in struct or union definition")
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2533
    return Nodes.CStructOrUnionDefNode(pos,
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        name = name, cname = cname, kind = kind, attributes = attributes,
2535
        typedef_flag = ctx.typedef_flag, visibility = ctx.visibility,
2536
        api = ctx.api, in_pxd = ctx.level == 'module_pxd', packed = packed)
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def p_visibility(s, prev_visibility):
    pos = s.position()
    visibility = prev_visibility
    if s.sy == 'IDENT' and s.systring in ('extern', 'public', 'readonly'):
        visibility = s.systring
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2543
        if prev_visibility != 'private' and visibility != prev_visibility:
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            s.error("Conflicting visibility options '%s' and '%s'"
                % (prev_visibility, visibility))
        s.next()
    return visibility
2548

2549
def p_c_modifiers(s):
2550
    if s.sy == 'IDENT' and s.systring in ('inline',):
2551
        modifier = s.systring
2552
        s.next()
2553 2554
        return [modifier] + p_c_modifiers(s)
    return []
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2555

2556 2557
def p_c_func_or_var_declaration(s, pos, ctx):
    cmethod_flag = ctx.level in ('c_class', 'c_class_pxd')
2558
    modifiers = p_c_modifiers(s)
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2559
    base_type = p_c_base_type(s, nonempty = 1, templates = ctx.templates)
2560 2561 2562
    declarator = p_c_declarator(s, ctx, cmethod_flag = cmethod_flag,
                                assignable = 1, nonempty = 1)
    declarator.overridable = ctx.overridable
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2563
    if s.sy == ':':
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2564
        if ctx.level not in ('module', 'c_class', 'module_pxd', 'c_class_pxd') and not ctx.templates:
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2565
            s.error("C function definition not allowed here")
2566
        doc, suite = p_suite(s, Ctx(level = 'function'), with_doc = 1)
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        result = Nodes.CFuncDefNode(pos,
2568
            visibility = ctx.visibility,
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            base_type = base_type,
2570
            declarator = declarator,
2571
            body = suite,
2572
            doc = doc,
2573
            modifiers = modifiers,
2574 2575
            api = ctx.api,
            overridable = ctx.overridable)
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    else:
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        #if api:
2578
        #    s.error("'api' not allowed with variable declaration")
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        declarators = [declarator]
        while s.sy == ',':
            s.next()
            if s.sy == 'NEWLINE':
                break
2584 2585
            declarator = p_c_declarator(s, ctx, cmethod_flag = cmethod_flag,
                                        assignable = 1, nonempty = 1)
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            declarators.append(declarator)
        s.expect_newline("Syntax error in C variable declaration")
2588
        result = Nodes.CVarDefNode(pos,
2589 2590
            visibility = ctx.visibility,
            base_type = base_type,
2591
            declarators = declarators,
2592 2593 2594
            in_pxd = ctx.level == 'module_pxd',
            api = ctx.api,
            overridable = ctx.overridable)
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    return result

2597
def p_ctypedef_statement(s, ctx):
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    # s.sy == 'ctypedef'
    pos = s.position()
    s.next()
2601
    visibility = p_visibility(s, ctx.visibility)
2602
    api = p_api(s)
2603
    ctx = ctx(typedef_flag = 1, visibility = visibility)
2604 2605
    if api:
        ctx.api = 1
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2606
    if s.sy == 'class':
2607
        return p_c_class_definition(s, pos, ctx)
2608
    elif s.sy == 'IDENT' and s.systring in ('packed', 'struct', 'union', 'enum'):
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2609
        if s.systring == 'enum':
2610
            return p_c_enum_definition(s, pos, ctx)
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        else:
2612
            return p_c_struct_or_union_definition(s, pos, ctx)
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    else:
2614
        base_type = p_c_base_type(s, nonempty = 1)
2615 2616
        if base_type.name is None:
            s.error("Syntax error in ctypedef statement")
2617
        declarator = p_c_declarator(s, ctx, is_type = 1, nonempty = 1)
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        s.expect_newline("Syntax error in ctypedef statement")
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        return Nodes.CTypeDefNode(
            pos, base_type = base_type,
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            declarator = declarator,
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            visibility = visibility, api = api,
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            in_pxd = ctx.level == 'module_pxd')
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def p_decorators(s):
    decorators = []
    while s.sy == 'DECORATOR':
        pos = s.position()
        s.next()
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        decstring = p_dotted_name(s, as_allowed=0)[2]
        names = decstring.split('.')
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        decorator = ExprNodes.NameNode(pos, name=EncodedString(names[0]))
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        for name in names[1:]:
            decorator = ExprNodes.AttributeNode(pos,
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                                           attribute=EncodedString(name),
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                                           obj=decorator)
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        if s.sy == '(':
            decorator = p_call(s, decorator)
        decorators.append(Nodes.DecoratorNode(pos, decorator=decorator))
        s.expect_newline("Expected a newline after decorator")
    return decorators

def p_def_statement(s, decorators=None):
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    # s.sy == 'def'
    pos = s.position()
    s.next()
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    name = EncodedString( p_ident(s) )
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    s.expect('(');
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    args, star_arg, starstar_arg = p_varargslist(s, terminator=')')
    s.expect(')')
    if p_nogil(s):
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        error(pos, "Python function cannot be declared nogil")
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    return_type_annotation = None
    if s.sy == '->':
        s.next()
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        return_type_annotation = p_test(s)
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    doc, body = p_suite(s, Ctx(level = 'function'), with_doc = 1)
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    return Nodes.DefNode(pos, name = name, args = args,
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        star_arg = star_arg, starstar_arg = starstar_arg,
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        doc = doc, body = body, decorators = decorators,
        return_type_annotation = return_type_annotation)
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def p_varargslist(s, terminator=')', annotated=1):
    args = p_c_arg_list(s, in_pyfunc = 1, nonempty_declarators = 1,
                        annotated = annotated)
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    star_arg = None
    starstar_arg = None
    if s.sy == '*':
        s.next()
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        if s.sy == 'IDENT':
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            star_arg = p_py_arg_decl(s, annotated=annotated)
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        if s.sy == ',':
            s.next()
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            args.extend(p_c_arg_list(s, in_pyfunc = 1,
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                nonempty_declarators = 1, kw_only = 1, annotated = annotated))
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        elif s.sy != terminator:
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            s.error("Syntax error in Python function argument list")
    if s.sy == '**':
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        s.next()
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        starstar_arg = p_py_arg_decl(s, annotated=annotated)
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    return (args, star_arg, starstar_arg)
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def p_py_arg_decl(s, annotated = 1):
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    pos = s.position()
    name = p_ident(s)
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    annotation = None
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    if annotated and s.sy == ':':
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        s.next()
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        annotation = p_test(s)
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    return Nodes.PyArgDeclNode(pos, name = name, annotation = annotation)
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def p_class_statement(s, decorators):
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    # s.sy == 'class'
    pos = s.position()
    s.next()
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    class_name = EncodedString( p_ident(s) )
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    class_name.encoding = s.source_encoding
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    arg_tuple = None
    keyword_dict = None
    starstar_arg = None
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    if s.sy == '(':
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        positional_args, keyword_args, star_arg, starstar_arg = \
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                            p_call_parse_args(s, allow_genexp = False)
        arg_tuple, keyword_dict = p_call_build_packed_args(
            pos, positional_args, keyword_args, star_arg)
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    if arg_tuple is None:
        # XXX: empty arg_tuple
        arg_tuple = ExprNodes.TupleNode(pos, args = [])
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    doc, body = p_suite(s, Ctx(level = 'class'), with_doc = 1)
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    return Nodes.PyClassDefNode(pos,
        name = class_name,
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        bases = arg_tuple,
        keyword_args = keyword_dict,
        starstar_arg = starstar_arg,
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        doc = doc, body = body, decorators = decorators)
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def p_c_class_definition(s, pos,  ctx):
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    # s.sy == 'class'
    s.next()
    module_path = []
    class_name = p_ident(s)
    while s.sy == '.':
        s.next()
        module_path.append(class_name)
        class_name = p_ident(s)
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    if module_path and ctx.visibility != 'extern':
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        error(pos, "Qualified class name only allowed for 'extern' C class")
    if module_path and s.sy == 'IDENT' and s.systring == 'as':
        s.next()
        as_name = p_ident(s)
    else:
        as_name = class_name
    objstruct_name = None
    typeobj_name = None
    base_class_module = None
    base_class_name = None
    if s.sy == '(':
        s.next()
        base_class_path = [p_ident(s)]
        while s.sy == '.':
            s.next()
            base_class_path.append(p_ident(s))
        if s.sy == ',':
            s.error("C class may only have one base class")
        s.expect(')')
        base_class_module = ".".join(base_class_path[:-1])
        base_class_name = base_class_path[-1]
    if s.sy == '[':
2749 2750
        if ctx.visibility not in ('public', 'extern') and not ctx.api:
            error(s.position(), "Name options only allowed for 'public', 'api', or 'extern' C class")
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        objstruct_name, typeobj_name = p_c_class_options(s)
    if s.sy == ':':
2753
        if ctx.level == 'module_pxd':
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            body_level = 'c_class_pxd'
        else:
            body_level = 'c_class'
2757
        doc, body = p_suite(s, Ctx(level = body_level), with_doc = 1)
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    else:
        s.expect_newline("Syntax error in C class definition")
        doc = None
        body = None
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    if ctx.visibility == 'extern':
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        if not module_path:
            error(pos, "Module name required for 'extern' C class")
        if typeobj_name:
            error(pos, "Type object name specification not allowed for 'extern' C class")
2767
    elif ctx.visibility == 'public':
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        if not objstruct_name:
            error(pos, "Object struct name specification required for 'public' C class")
        if not typeobj_name:
            error(pos, "Type object name specification required for 'public' C class")
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    elif ctx.visibility == 'private':
        if ctx.api:
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            if not objstruct_name:
                error(pos, "Object struct name specification required for 'api' C class")
            if not typeobj_name:
                error(pos, "Type object name specification required for 'api' C class")
2778
    else:
2779
        error(pos, "Invalid class visibility '%s'" % ctx.visibility)
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    return Nodes.CClassDefNode(pos,
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        visibility = ctx.visibility,
        typedef_flag = ctx.typedef_flag,
        api = ctx.api,
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        module_name = ".".join(module_path),
        class_name = class_name,
        as_name = as_name,
        base_class_module = base_class_module,
        base_class_name = base_class_name,
        objstruct_name = objstruct_name,
        typeobj_name = typeobj_name,
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        in_pxd = ctx.level == 'module_pxd',
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        doc = doc,
        body = body)

def p_c_class_options(s):
    objstruct_name = None
    typeobj_name = None
    s.expect('[')
    while 1:
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        if s.sy != 'IDENT':
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            break
        if s.systring == 'object':
            s.next()
            objstruct_name = p_ident(s)
        elif s.systring == 'type':
            s.next()
            typeobj_name = p_ident(s)
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        if s.sy != ',':
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            break
        s.next()
    s.expect(']', "Expected 'object' or 'type'")
    return objstruct_name, typeobj_name

def p_property_decl(s):
    pos = s.position()
    s.next() # 'property'
    name = p_ident(s)
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    doc, body = p_suite(s, Ctx(level = 'property'), with_doc = 1)
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    return Nodes.PropertyNode(pos, name = name, doc = doc, body = body)

def p_doc_string(s):
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    if s.sy == 'BEGIN_STRING':
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        pos = s.position()
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        kind, bytes_result, unicode_result = p_cat_string_literal(s)
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        if s.sy != 'EOF':
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            s.expect_newline("Syntax error in doc string")
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        if kind in ('u', ''):
            return unicode_result
        warning(pos, "Python 3 requires docstrings to be unicode strings")
        return bytes_result
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    else:
        return None
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def p_code(s, level=None):
    body = p_statement_list(s, Ctx(level = level), first_statement = 1)
    if s.sy != 'EOF':
        s.error("Syntax error in statement [%s,%s]" % (
            repr(s.sy), repr(s.systring)))
    return body
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2841
COMPILER_DIRECTIVE_COMMENT_RE = re.compile(r"^#\s*cython\s*:\s*((\w|[.])+\s*=.*)$")
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def p_compiler_directive_comments(s):
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    result = {}
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    while s.sy == 'commentline':
        m = COMPILER_DIRECTIVE_COMMENT_RE.match(s.systring)
        if m:
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            directives = m.group(1).strip()
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            try:
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                result.update( Options.parse_directive_list(
                    directives, ignore_unknown=True) )
2852
            except ValueError, e:
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                s.error(e.args[0], fatal=False)
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        s.next()
    return result

2857
def p_module(s, pxd, full_module_name):
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    pos = s.position()
2859

2860
    directive_comments = p_compiler_directive_comments(s)
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    s.parse_comments = False

2863
    if 'language_level' in directive_comments:
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        s.context.set_language_level(directive_comments['language_level'])
2865

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    doc = p_doc_string(s)
    if pxd:
        level = 'module_pxd'
    else:
        level = 'module'
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2872
    body = p_statement_list(s, Ctx(level = level), first_statement = 1)
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    if s.sy != 'EOF':
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        s.error("Syntax error in statement [%s,%s]" % (
            repr(s.sy), repr(s.systring)))
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    return ModuleNode(pos, doc = doc, body = body,
                      full_module_name = full_module_name,
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                      directive_comments = directive_comments)
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def p_cpp_class_definition(s, pos,  ctx):
    # s.sy == 'cppclass'
    s.next()
    module_path = []
    class_name = p_ident(s)
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    cname = p_opt_cname(s)
    if cname is None and ctx.namespace is not None:
        cname = ctx.namespace + "::" + class_name
2888
    if s.sy == '.':
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        error(pos, "Qualified class name not allowed C++ class")
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    if s.sy == '[':
        s.next()
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        templates = [p_ident(s)]
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        while s.sy == ',':
            s.next()
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            templates.append(p_ident(s))
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        s.expect(']')
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    else:
        templates = None
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    if s.sy == '(':
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        s.next()
        base_classes = [p_dotted_name(s, False)[2]]
        while s.sy == ',':
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            s.next()
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            base_classes.append(p_dotted_name(s, False)[2])
2905
        s.expect(')')
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    else:
        base_classes = []
2908
    if s.sy == '[':
2909
        error(s.position(), "Name options not allowed for C++ class")
2910
    if s.sy == ':':
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        s.next()
        s.expect('NEWLINE')
        s.expect_indent()
        attributes = []
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        body_ctx = Ctx(visibility = ctx.visibility)
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        body_ctx.templates = templates
2917
        while s.sy != 'DEDENT':
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            if s.systring == 'cppclass':
                attributes.append(
                    p_cpp_class_definition(s, s.position(), body_ctx))
            elif s.sy != 'pass':
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                attributes.append(
                    p_c_func_or_var_declaration(s, s.position(), body_ctx))
            else:
                s.next()
                s.expect_newline("Expected a newline")
        s.expect_dedent()
2928
    else:
2929
        attributes = None
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        s.expect_newline("Syntax error in C++ class definition")
    return Nodes.CppClassNode(pos,
        name = class_name,
2933
        cname = cname,
2934
        base_classes = base_classes,
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        visibility = ctx.visibility,
        in_pxd = ctx.level == 'module_pxd',
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        attributes = attributes,
        templates = templates)
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#----------------------------------------------
#
#   Debugging
#
#----------------------------------------------

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def print_parse_tree(f, node, level, key = None):
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    from types import ListType, TupleType
2950
    from Nodes import Node
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    ind = "  " * level
    if node:
        f.write(ind)
        if key:
            f.write("%s: " % key)
        t = type(node)
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        if t is tuple:
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            f.write("(%s @ %s\n" % (node[0], node[1]))
            for i in xrange(2, len(node)):
                print_parse_tree(f, node[i], level+1)
            f.write("%s)\n" % ind)
            return
        elif isinstance(node, Node):
            try:
                tag = node.tag
            except AttributeError:
                tag = node.__class__.__name__
            f.write("%s @ %s\n" % (tag, node.pos))
            for name, value in node.__dict__.items():
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                if name != 'tag' and name != 'pos':
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                    print_parse_tree(f, value, level+1, name)
            return
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        elif t is list:
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            f.write("[\n")
            for i in xrange(len(node)):
                print_parse_tree(f, node[i], level+1)
            f.write("%s]\n" % ind)
            return
    f.write("%s%s\n" % (ind, node))