Parsing.py 76.5 KB
Newer Older
William Stein's avatar
William Stein committed
1 2 3 4
#
#   Pyrex Parser
#

5 6 7
import os
import re
import sys
William Stein's avatar
William Stein committed
8
from types import ListType, TupleType
9
from Scanning import PyrexScanner, FileSourceDescriptor
William Stein's avatar
William Stein committed
10 11
import Nodes
import ExprNodes
12 13
import StringEncoding
from StringEncoding import EncodedString, BytesLiteral
14
from ModuleNode import ModuleNode
15
from Errors import error, warning, InternalError
16
from Cython import Utils
Stefan Behnel's avatar
Stefan Behnel committed
17
import Future
18
import Options
William Stein's avatar
William Stein committed
19

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
class Ctx(object):
    #  Parsing context
    level = 'other'
    visibility = 'private'
    cdef_flag = 0
    typedef_flag = 0
    api = 0
    overridable = 0
    nogil = 0

    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

William Stein's avatar
William Stein committed
40 41 42 43 44 45 46 47 48 49 50 51 52
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()
Stefan Behnel's avatar
Stefan Behnel committed
53
        if s.sy != ',':
William Stein's avatar
William Stein committed
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73
            break
        s.next()
    return names

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

def p_binop_expr(s, ops, p_sub_expr):
    n1 = p_sub_expr(s)
    while s.sy in ops:
        op = s.sy
        pos = s.position()
        s.next()
        n2 = p_sub_expr(s)
        n1 = ExprNodes.binop_node(pos, op, n1, n2)
    return n1

Robert Bradshaw's avatar
Robert Bradshaw committed
74
#expression: or_test [if or_test else test] | lambda_form
William Stein's avatar
William Stein committed
75 76

def p_simple_expr(s):
Robert Bradshaw's avatar
Robert Bradshaw committed
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
    pos = s.position()
    expr = p_or_test(s)
    if s.sy == 'if':
        s.next()
        test = p_or_test(s)
        if s.sy == 'else':
            s.next()
            other = p_test(s)
            return ExprNodes.CondExprNode(pos, test=test, true_val=expr, false_val=other)
        else:
            s.error("Expected 'else'")
    else:
        return expr
        
#test: or_test | lambda_form
        
def p_test(s):
    return p_or_test(s)

#or_test: and_test ('or' and_test)*

def p_or_test(s):
William Stein's avatar
William Stein committed
99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203
    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):
    n1 = p_bit_expr(s)
    if s.sy in comparison_ops:
        pos = s.position()
        op = p_cmp_op(s)
        n2 = p_bit_expr(s)
        n1 = ExprNodes.PrimaryCmpNode(pos, 
            operator = op, operand1 = n1, operand2 = n2)
        if s.sy in comparison_ops:
            n1.cascade = p_cascaded_cmp(s)
    return n1

def p_cascaded_cmp(s):
    pos = s.position()
    op = p_cmp_op(s)
    n2 = p_bit_expr(s)
    result = ExprNodes.CascadedCmpNode(pos, 
        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
    
comparison_ops = (
    '<', '>', '==', '>=', '<=', '<>', '!=', 
    '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):
Robert Bradshaw's avatar
Robert Bradshaw committed
204
    return p_binop_expr(s, ('*', '/', '%', '//'), p_factor)
William Stein's avatar
William Stein committed
205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231

#factor: ('+'|'-'|'~'|'&'|typecast|sizeof) factor | power

def p_factor(s):
    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)
232 233
    if base_type.name is None:
        s.error("Unknown type")
William Stein's avatar
William Stein committed
234
    declarator = p_c_declarator(s, empty = 1)
235 236 237 238 239
    if s.sy == '?':
        s.next()
        typecheck = 1
    else:
        typecheck = 0
William Stein's avatar
William Stein committed
240 241 242 243 244
    s.expect(">")
    operand = p_factor(s)
    return ExprNodes.TypecastNode(pos, 
        base_type = base_type, 
        declarator = declarator,
245 246
        operand = operand,
        typecheck = typecheck)
William Stein's avatar
William Stein committed
247 248 249 250 251 252

def p_sizeof(s):
    # s.sy == ident "sizeof"
    pos = s.position()
    s.next()
    s.expect('(')
253 254 255
    # Here we decide if we are looking at an expression or type
    # If it is actually a type, but parsable as an expression, 
    # we treat it as an expression here. 
256 257 258 259
    if looking_at_expr(s):
        operand = p_simple_expr(s)
        node = ExprNodes.SizeofVarNode(pos, operand = operand)
    else:
William Stein's avatar
William Stein committed
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
        base_type = p_c_base_type(s)
        declarator = p_c_declarator(s, empty = 1)
        node = ExprNodes.SizeofTypeNode(pos, 
            base_type = base_type, declarator = declarator)
    s.expect(')')
    return node

#power: atom trailer* ('**' factor)*

def p_power(s):
    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

#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()
290
        name = EncodedString( p_ident(s) )
William Stein's avatar
William Stein committed
291 292 293 294 295 296 297 298 299 300 301 302 303 304
        return ExprNodes.AttributeNode(pos, 
            obj = node1, attribute = name)

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

def p_call(s, function):
    # s.sy == '('
    pos = s.position()
    s.next()
    positional_args = []
    keyword_args = []
    star_arg = None
    starstar_arg = None
305 306 307 308 309
    while s.sy not in ('**', ')'):
        if s.sy == '*':
            if star_arg:
                s.error("only one star-arg parameter allowed",
                    pos = s.position())
William Stein's avatar
William Stein committed
310
            s.next()
311
            star_arg = p_simple_expr(s)
William Stein's avatar
William Stein committed
312
        else:
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331
            arg = p_simple_expr(s)
            if s.sy == '=':
                s.next()
                if not arg.is_name:
                    s.error("Expected an identifier before '='",
                        pos = arg.pos)
                encoded_name = EncodedString(arg.name)
                keyword = ExprNodes.IdentifierStringNode(arg.pos, 
                    value = encoded_name)
                arg = p_simple_expr(s)
                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)
Stefan Behnel's avatar
Stefan Behnel committed
332
        if s.sy != ',':
William Stein's avatar
William Stein committed
333 334
            break
        s.next()
335

William Stein's avatar
William Stein committed
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360
    if s.sy == '**':
        s.next()
        starstar_arg = p_simple_expr(s)
        if s.sy == ',':
            s.next()
    s.expect(')')
    if not (keyword_args or star_arg or starstar_arg):
        return ExprNodes.SimpleCallNode(pos,
            function = function,
            args = positional_args)
    else:
        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:
361 362
            keyword_args = [ExprNodes.DictItemNode(pos=key.pos, key=key, value=value) 
                              for key, value in keyword_args]
William Stein's avatar
William Stein committed
363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415
            keyword_dict = ExprNodes.DictNode(pos,
                key_value_pairs = keyword_args)
        return ExprNodes.GeneralCallNode(pos, 
            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]
        result = ExprNodes.SliceIndexNode(pos, 
            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()
    if s.sy == '.':
        expect_ellipsis(s)
        return [ExprNodes.EllipsisNode(pos)]
    else:
        start = p_slice_element(s, (':',))
Stefan Behnel's avatar
Stefan Behnel committed
416
        if s.sy != ':':
William Stein's avatar
William Stein committed
417 418 419
            return [start]
        s.next()
        stop = p_slice_element(s, (':', ',', ']'))
Stefan Behnel's avatar
Stefan Behnel committed
420
        if s.sy != ':':
William Stein's avatar
William Stein committed
421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481
            return [start, stop]
        s.next()
        step = p_slice_element(s, (':', ',', ']'))
        return [start, stop, step]

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:
        return p_simple_expr(s)
    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)

#atom: '(' [testlist] ')' | '[' [listmaker] ']' | '{' [dictmaker] '}' | '`' testlist '`' | NAME | NUMBER | STRING+

def p_atom(s):
    pos = s.position()
    sy = s.sy
    if sy == '(':
        s.next()
        if s.sy == ')':
            result = ExprNodes.TupleNode(pos, args = [])
        else:
            result = p_expr(s)
        s.expect(')')
        return result
    elif sy == '[':
        return p_list_maker(s)
    elif sy == '{':
        return p_dict_maker(s)
    elif sy == '`':
        return p_backquote_expr(s)
    elif sy == 'INT':
482
        value = s.systring
William Stein's avatar
William Stein committed
483
        s.next()
484 485 486 487 488 489 490 491 492 493 494 495
        unsigned = ""
        longness = ""
        while value[-1] in "UuLl":
            if value[-1] in "Ll":
                longness += "L"
            else:
                unsigned += "U"
            value = value[:-1]
        return ExprNodes.IntNode(pos, 
                                 value = value,
                                 unsigned = unsigned,
                                 longness = longness)
William Stein's avatar
William Stein committed
496 497 498 499 500 501 502 503
    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)
504
    elif sy == 'BEGIN_STRING':
William Stein's avatar
William Stein committed
505 506 507
        kind, value = p_cat_string_literal(s)
        if kind == 'c':
            return ExprNodes.CharNode(pos, value = value)
508 509
        elif kind == 'u':
            return ExprNodes.UnicodeNode(pos, value = value)
William Stein's avatar
William Stein committed
510 511 512
        else:
            return ExprNodes.StringNode(pos, value = value)
    elif sy == 'IDENT':
513
        name = EncodedString( s.systring )
William Stein's avatar
William Stein committed
514 515 516
        s.next()
        if name == "None":
            return ExprNodes.NoneNode(pos)
517
        elif name == "True":
518
            return ExprNodes.BoolNode(pos, value=True)
519
        elif name == "False":
520
            return ExprNodes.BoolNode(pos, value=False)
521 522
        elif name == "NULL":
            return ExprNodes.NullNode(pos)
William Stein's avatar
William Stein committed
523
        else:
524
            return p_name(s, name)
William Stein's avatar
William Stein committed
525 526 527
    else:
        s.error("Expected an identifier or literal")

528 529 530 531 532 533 534 535 536
def p_name(s, name):
    pos = s.position()
    if not s.compile_time_expr:
        try:
            value = s.compile_time_env.lookup_here(name)
        except KeyError:
            pass
        else:
            rep = repr(value)
537 538 539
            if isinstance(value, bool):
                return ExprNodes.BoolNode(pos, value = value)
            elif isinstance(value, int):
540 541
                return ExprNodes.IntNode(pos, value = rep)
            elif isinstance(value, long):
542
                return ExprNodes.IntNode(pos, value = rep, longness = "L")
543 544
            elif isinstance(value, float):
                return ExprNodes.FloatNode(pos, value = rep)
Stefan Behnel's avatar
Stefan Behnel committed
545
            elif isinstance(value, (str, unicode)):
546
                return ExprNodes.StringNode(pos, value = value)
547 548 549 550 551
            else:
                error(pos, "Invalid type for compile-time constant: %s"
                    % value.__class__.__name__)
    return ExprNodes.NameNode(pos, name = name)

William Stein's avatar
William Stein committed
552 553
def p_cat_string_literal(s):
    # A sequence of one or more adjacent string literals.
554
    # Returns (kind, value) where kind in ('b', 'c', 'u')
William Stein's avatar
William Stein committed
555
    kind, value = p_string_literal(s)
Stefan Behnel's avatar
Stefan Behnel committed
556
    if kind != 'c':
William Stein's avatar
William Stein committed
557
        strings = [value]
558
        while s.sy == 'BEGIN_STRING':
William Stein's avatar
William Stein committed
559 560
            next_kind, next_value = p_string_literal(s)
            if next_kind == 'c':
561 562
                error(s.position(),
                      "Cannot concatenate char literal with another string or char literal")
563 564 565 566 567 568 569 570
            elif next_kind != kind:
                # we have to switch to unicode now
                if kind == 'b':
                    # concatenating a unicode string to byte strings
                    strings = [u''.join([s.decode(s.encoding) for s in strings])]
                elif kind == 'u':
                    # concatenating a byte string to unicode strings
                    strings.append(next_value.decode(next_value.encoding))
571
                kind = 'u'
572 573 574 575 576 577
            else:
                strings.append(next_value)
        if kind == 'u':
            value = EncodedString( u''.join(strings) )
        else:
            value = BytesLiteral( ''.join(strings) )
578
            value.encoding = s.source_encoding
William Stein's avatar
William Stein committed
579 580 581
    return kind, value

def p_opt_string_literal(s):
582
    if s.sy == 'BEGIN_STRING':
William Stein's avatar
William Stein committed
583 584 585 586 587 588
        return p_string_literal(s)
    else:
        return None

def p_string_literal(s):
    # A single string or char literal.
589
    # Returns (kind, value) where kind in ('b', 'c', 'u')
William Stein's avatar
William Stein committed
590 591
    # s.sy == 'BEGIN_STRING'
    pos = s.position()
592
    is_raw = 0
William Stein's avatar
William Stein committed
593
    kind = s.systring[:1].lower()
594 595 596 597 598 599
    if kind == 'r':
        kind = ''
        is_raw = 1
    elif kind in 'ub':
        is_raw = s.systring[1:2].lower() == 'r'
    elif kind != 'c':
William Stein's avatar
William Stein committed
600
        kind = ''
Stefan Behnel's avatar
Stefan Behnel committed
601 602 603
    if Future.unicode_literals in s.context.future_directives:
        if kind == '':
            kind = 'u'
604 605
    elif kind == '':
        kind = 'b'
606 607 608 609
    if kind == 'u':
        chars = StringEncoding.UnicodeLiteralBuilder()
    else:
        chars = StringEncoding.BytesLiteralBuilder(s.source_encoding)
William Stein's avatar
William Stein committed
610 611 612 613 614
    while 1:
        s.next()
        sy = s.sy
        #print "p_string_literal: sy =", sy, repr(s.systring) ###
        if sy == 'CHARS':
615
            chars.append(s.systring)
William Stein's avatar
William Stein committed
616
        elif sy == 'ESCAPE':
617
            has_escape = True
William Stein's avatar
William Stein committed
618
            systr = s.systring
619
            if is_raw:
620 621 622 623 624 625
                if systr == u'\\\n':
                    chars.append(u'\\\n')
                elif systr == u'\\\"':
                    chars.append(u'"')
                elif systr == u'\\\'':
                    chars.append(u"'")
William Stein's avatar
William Stein committed
626
                else:
627
                    chars.append(systr)
William Stein's avatar
William Stein committed
628 629
            else:
                c = systr[1]
630 631 632
                if c in u"01234567":
                    chars.append_charval( int(systr[1:], 8) )
                elif c in u"'\"\\":
633
                    chars.append(c)
634 635 636 637
                elif c in u"abfnrtv":
                    chars.append(
                        StringEncoding.char_from_escape_sequence(systr))
                elif c == u'\n':
William Stein's avatar
William Stein committed
638
                    pass
639
                elif c in u'Uux':
640 641
                    if kind == 'u' or c == 'x':
                        chrval = int(systr[2:], 16)
642
                        if chrval > 1114111: # sys.maxunicode:
643 644
                            s.error("Invalid unicode escape '%s'" % systr,
                                    pos = pos)
645 646 647 648 649
                        elif chrval > 65535:
                            warning(s.position(),
                                    "Unicode characters above 65535 are not "
                                    "necessarily portable across Python installations", 1)
                        chars.append_charval(chrval)
650
                    else:
651
                        # unicode escapes in plain byte strings are not unescaped
652
                        chars.append(systr)
William Stein's avatar
William Stein committed
653
                else:
654
                    chars.append(u'\\' + systr[1:])
William Stein's avatar
William Stein committed
655
        elif sy == 'NEWLINE':
656
            chars.append(u'\n')
William Stein's avatar
William Stein committed
657 658 659 660 661 662 663 664
        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))
665 666 667 668 669 670
    if kind == 'c':
        value = chars.getchar()
        if len(value) != 1:
            error(pos, u"invalid character literal: %r" % value)
    else:
        value = chars.getstring()
William Stein's avatar
William Stein committed
671 672 673 674
    s.next()
    #print "p_string_literal: value =", repr(value) ###
    return kind, value

Robert Bradshaw's avatar
Robert Bradshaw committed
675 676 677 678 679 680
# list_display  	::=  	"[" [listmaker] "]"
# listmaker 	::= 	expression ( list_for | ( "," expression )* [","] )
# list_iter 	::= 	list_for | list_if
# list_for 	::= 	"for" expression_list "in" testlist [list_iter]
# list_if 	::= 	"if" test [list_iter]
        
William Stein's avatar
William Stein committed
681 682 683 684
def p_list_maker(s):
    # s.sy == '['
    pos = s.position()
    s.next()
Robert Bradshaw's avatar
Robert Bradshaw committed
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
    if s.sy == ']':
        s.expect(']')
        return ExprNodes.ListNode(pos, args = [])
    expr = p_simple_expr(s)
    if s.sy == 'for':
        loop = p_list_for(s)
        s.expect(']')
        inner_loop = loop
        while not isinstance(inner_loop.body, Nodes.PassStatNode):
            inner_loop = inner_loop.body
            if isinstance(inner_loop, Nodes.IfStatNode):
                 inner_loop = inner_loop.if_clauses[0]
        append = ExprNodes.ListComprehensionAppendNode( pos, expr = expr )
        inner_loop.body = Nodes.ExprStatNode(pos, expr = append)
        return ExprNodes.ListComprehensionNode(pos, loop = loop, append = append)
    else:
        exprs = [expr]
        if s.sy == ',':
            s.next()
            exprs += p_simple_expr_list(s)
        s.expect(']')
        return ExprNodes.ListNode(pos, args = exprs)
        
def p_list_iter(s):
    if s.sy == 'for':
        return p_list_for(s)
    elif s.sy == 'if':
        return p_list_if(s)
    else:
        return Nodes.PassStatNode(s.position())
William Stein's avatar
William Stein committed
715

Robert Bradshaw's avatar
Robert Bradshaw committed
716 717 718 719 720 721 722 723 724 725 726 727 728
def p_list_for(s):
    # s.sy == 'for'
    pos = s.position()
    s.next()
    kw = p_for_bounds(s)
    kw['else_clause'] = None
    kw['body'] = p_list_iter(s)
    return Nodes.ForStatNode(pos, **kw)
        
def p_list_if(s):
    # s.sy == 'if'
    pos = s.position()
    s.next()
Robert Bradshaw's avatar
Robert Bradshaw committed
729
    test = p_test(s)
Robert Bradshaw's avatar
Robert Bradshaw committed
730 731 732 733
    return Nodes.IfStatNode(pos, 
        if_clauses = [Nodes.IfClauseNode(pos, condition = test, body = p_list_iter(s))],
        else_clause = None )
    
William Stein's avatar
William Stein committed
734 735 736 737 738 739 740
#dictmaker: test ':' test (',' test ':' test)* [',']

def p_dict_maker(s):
    # s.sy == '{'
    pos = s.position()
    s.next()
    items = []
Stefan Behnel's avatar
Stefan Behnel committed
741
    while s.sy != '}':
Robert Bradshaw's avatar
Robert Bradshaw committed
742
        items.append(p_dict_item(s))
Stefan Behnel's avatar
Stefan Behnel committed
743
        if s.sy != ',':
William Stein's avatar
William Stein committed
744 745 746 747
            break
        s.next()
    s.expect('}')
    return ExprNodes.DictNode(pos, key_value_pairs = items)
Robert Bradshaw's avatar
Robert Bradshaw committed
748 749 750 751 752 753
    
def p_dict_item(s):
    key = p_simple_expr(s)
    s.expect(':')
    value = p_simple_expr(s)
    return ExprNodes.DictItemNode(key.pos, key=key, value=value)
William Stein's avatar
William Stein committed
754 755 756 757 758 759 760 761 762 763 764 765 766

def p_backquote_expr(s):
    # s.sy == '`'
    pos = s.position()
    s.next()
    arg = p_expr(s)
    s.expect('`')
    return ExprNodes.BackquoteNode(pos, arg = arg)

def p_simple_expr_list(s):
    exprs = []
    while s.sy not in expr_terminators:
        exprs.append(p_simple_expr(s))
Stefan Behnel's avatar
Stefan Behnel committed
767
        if s.sy != ',':
William Stein's avatar
William Stein committed
768 769 770 771 772 773 774 775 776 777 778 779 780 781
            break
        s.next()
    return exprs

def p_expr(s):
    pos = s.position()
    expr = p_simple_expr(s)
    if s.sy == ',':
        s.next()
        exprs = [expr] + p_simple_expr_list(s)
        return ExprNodes.TupleNode(pos, args = exprs)
    else:
        return expr

Robert Bradshaw's avatar
Robert Bradshaw committed
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797

#testlist: test (',' test)* [',']
# differs from p_expr only in the fact that it cannot contain conditional expressions

def p_testlist(s):
    pos = s.position()
    expr = p_test(s)
    if s.sy == ',':
        exprs = [expr]
        while s.sy == ',':
            s.next()
            exprs.append(p_test(s))
        return ExprNodes.TupleNode(pos, args = exprs)
    else:
        return expr
        
William Stein's avatar
William Stein committed
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818
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)

def p_expression_or_assignment(s):
    expr_list = [p_expr(s)]
    while s.sy == '=':
        s.next()
        expr_list.append(p_expr(s))
    if len(expr_list) == 1:
Dag Sverre Seljebotn's avatar
Merge  
Dag Sverre Seljebotn committed
819
        if re.match(r"([+*/\%^\&|-]|<<|>>|\*\*|//)=", s.sy):
820 821 822
            lhs = expr_list[0]
            if not isinstance(lhs, (ExprNodes.AttributeNode, ExprNodes.IndexNode, ExprNodes.NameNode) ):
                error(lhs.pos, "Illegal operand for inplace operation.")
Dag Sverre Seljebotn's avatar
Merge  
Dag Sverre Seljebotn committed
823
            operator = s.sy[:-1]
824 825 826
            s.next()
            rhs = p_expr(s)
            return Nodes.InPlaceAssignmentNode(lhs.pos, operator = operator, lhs = lhs, rhs = rhs)
827 828 829
        expr = expr_list[0]
        if isinstance(expr, ExprNodes.StringNode):
            return Nodes.PassStatNode(expr.pos)
830 831
        else:
            return Nodes.ExprStatNode(expr.pos, expr = expr)
William Stein's avatar
William Stein committed
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
    else:
        expr_list_list = []
        flatten_parallel_assignments(expr_list, expr_list_list)
        nodes = []
        for expr_list in expr_list_list:
            lhs_list = expr_list[:-1]
            rhs = expr_list[-1]
            if len(lhs_list) == 1:
                node = Nodes.SingleAssignmentNode(rhs.pos, 
                    lhs = lhs_list[0], rhs = rhs)
            else:
                node = Nodes.CascadedAssignmentNode(rhs.pos,
                    lhs_list = lhs_list, rhs = rhs)
            nodes.append(node)
        if len(nodes) == 1:
            return nodes[0]
        else:
            return Nodes.ParallelAssignmentNode(nodes[0].pos, stats = nodes)

def flatten_parallel_assignments(input, output):
    #  The input is a list of expression nodes, representing 
    #  the LHSs and RHS of one (possibly cascaded) assignment 
    #  statement. If they are all sequence constructors with 
    #  the same number of arguments, rearranges them into a
    #  list of equivalent assignments between the individual 
    #  elements. This transformation is applied recursively.
    size = find_parallel_assignment_size(input)
    if size >= 0:
        for i in range(size):
            new_exprs = [expr.args[i] for expr in input]
            flatten_parallel_assignments(new_exprs, output)
    else:
        output.append(input)

def find_parallel_assignment_size(input):
    #  The input is a list of expression nodes. If 
    #  they are all sequence constructors with the same number
    #  of arguments, return that number, else return -1.
    #  Produces an error message if they are all sequence
    #  constructors but not all the same size.
    for expr in input:
        if not expr.is_sequence_constructor:
            return -1
    rhs = input[-1]
    rhs_size = len(rhs.args)
    for lhs in input[:-1]:
        lhs_size = len(lhs.args)
Stefan Behnel's avatar
Stefan Behnel committed
879
        if lhs_size != rhs_size:
William Stein's avatar
William Stein committed
880 881 882 883 884 885 886 887 888 889 890 891
            error(lhs.pos, "Unpacking sequence of wrong size (expected %d, got %d)"
                % (lhs_size, rhs_size))
            return -1
    return rhs_size

def p_print_statement(s):
    # s.sy == 'print'
    pos = s.position()
    s.next()
    if s.sy == '>>':
        s.error("'print >>' not yet implemented")
    args = []
892
    ends_with_comma = 0
William Stein's avatar
William Stein committed
893 894 895 896 897
    if s.sy not in ('NEWLINE', 'EOF'):
        args.append(p_simple_expr(s))
        while s.sy == ',':
            s.next()
            if s.sy in ('NEWLINE', 'EOF'):
898
                ends_with_comma = 1
William Stein's avatar
William Stein committed
899 900
                break
            args.append(p_simple_expr(s))
901
    arg_tuple = ExprNodes.TupleNode(pos, args = args)
902 903
    return Nodes.PrintStatNode(pos,
        arg_tuple = arg_tuple, append_newline = not ends_with_comma)
William Stein's avatar
William Stein committed
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955

def p_del_statement(s):
    # s.sy == 'del'
    pos = s.position()
    s.next()
    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:
        value = p_expr(s)
    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
    if s.sy not in statement_terminators:
        exc_type = p_simple_expr(s)
        if s.sy == ',':
            s.next()
            exc_value = p_simple_expr(s)
            if s.sy == ',':
                s.next()
                exc_tb = p_simple_expr(s)
956 957 958 959 960 961 962
    if exc_type or exc_value or exc_tb:
        return Nodes.RaiseStatNode(pos, 
            exc_type = exc_type,
            exc_value = exc_value,
            exc_tb = exc_tb)
    else:
        return Nodes.ReraiseStatNode(pos)
William Stein's avatar
William Stein committed
963 964 965 966 967 968 969 970 971 972 973 974

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:
975
        dotted_name = EncodedString(dotted_name)
William Stein's avatar
William Stein committed
976 977 978 979 980
        if kind == 'cimport':
            stat = Nodes.CImportStatNode(pos, 
                module_name = dotted_name,
                as_name = as_name)
        else:
981 982
            if as_name and "." in dotted_name:
                name_list = ExprNodes.ListNode(pos, args = [
983
                    ExprNodes.StringNode(pos, value = EncodedString("*"))])
984 985
            else:
                name_list = None
William Stein's avatar
William Stein committed
986 987 988 989
            stat = Nodes.SingleAssignmentNode(pos,
                lhs = ExprNodes.NameNode(pos, 
                    name = as_name or target_name),
                rhs = ExprNodes.ImportNode(pos, 
990 991
                    module_name = ExprNodes.IdentifierStringNode(
                        pos, value = dotted_name),
992
                    name_list = name_list))
William Stein's avatar
William Stein committed
993 994 995
        stats.append(stat)
    return Nodes.StatListNode(pos, stats = stats)

Stefan Behnel's avatar
Stefan Behnel committed
996
def p_from_import_statement(s, first_statement = 0):
William Stein's avatar
William Stein committed
997 998 999 1000 1001 1002 1003 1004 1005 1006
    # s.sy == 'from'
    pos = s.position()
    s.next()
    (dotted_name_pos, _, dotted_name, _) = \
        p_dotted_name(s, as_allowed = 0)
    if s.sy in ('import', 'cimport'):
        kind = s.sy
        s.next()
    else:
        s.error("Expected 'import' or 'cimport'")
1007
    is_cimport = kind == 'cimport'
William Stein's avatar
William Stein committed
1008
    if s.sy == '*':
1009
        imported_names = [(s.position(), "*", None, None)]
Dag Sverre Seljebotn's avatar
Merge  
Dag Sverre Seljebotn committed
1010 1011
        s.next()
    else:
1012
        imported_names = [p_imported_name(s, is_cimport)]
William Stein's avatar
William Stein committed
1013 1014
    while s.sy == ',':
        s.next()
1015
        imported_names.append(p_imported_name(s, is_cimport))
1016
    dotted_name = EncodedString(dotted_name)
Stefan Behnel's avatar
Stefan Behnel committed
1017 1018 1019 1020
    if dotted_name == '__future__':
        if not first_statement:
            s.error("from __future__ imports must occur at the beginning of the file")
        else:
1021
            for (name_pos, name, as_name, kind) in imported_names:
1022 1023 1024
                if name == "braces":
                    s.error("not a chance", name_pos)
                    break
Stefan Behnel's avatar
Stefan Behnel committed
1025 1026 1027
                try:
                    directive = getattr(Future, name)
                except AttributeError:
1028
                    s.error("future feature %s is not defined" % name, name_pos)
Stefan Behnel's avatar
Stefan Behnel committed
1029 1030 1031 1032
                    break
                s.context.future_directives.add(directive)
        return Nodes.PassStatNode(pos)
    elif kind == 'cimport':
William Stein's avatar
William Stein committed
1033 1034 1035 1036 1037 1038
        return Nodes.FromCImportStatNode(pos,
            module_name = dotted_name,
            imported_names = imported_names)
    else:
        imported_name_strings = []
        items = []
1039
        for (name_pos, name, as_name, kind) in imported_names:
1040
            encoded_name = EncodedString(name)
William Stein's avatar
William Stein committed
1041
            imported_name_strings.append(
1042
                ExprNodes.IdentifierStringNode(name_pos, value = encoded_name))
William Stein's avatar
William Stein committed
1043 1044 1045
            items.append(
                (name,
                 ExprNodes.NameNode(name_pos, 
Stefan Behnel's avatar
Stefan Behnel committed
1046
                                    name = as_name or name)))
William Stein's avatar
William Stein committed
1047 1048
        import_list = ExprNodes.ListNode(
            imported_names[0][0], args = imported_name_strings)
1049
        dotted_name = EncodedString(dotted_name)
William Stein's avatar
William Stein committed
1050 1051
        return Nodes.FromImportStatNode(pos,
            module = ExprNodes.ImportNode(dotted_name_pos,
1052
                module_name = ExprNodes.IdentifierStringNode(pos, value = dotted_name),
William Stein's avatar
William Stein committed
1053 1054 1055
                name_list = import_list),
            items = items)

1056 1057 1058
imported_name_kinds = ('class', 'struct', 'union')

def p_imported_name(s, is_cimport):
William Stein's avatar
William Stein committed
1059
    pos = s.position()
1060 1061 1062 1063
    kind = None
    if is_cimport and s.systring in imported_name_kinds:
        kind = s.systring
        s.next()
William Stein's avatar
William Stein committed
1064 1065
    name = p_ident(s)
    as_name = p_as_name(s)
1066
    return (pos, name, as_name, kind)
William Stein's avatar
William Stein committed
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077

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)
Stefan Behnel's avatar
Stefan Behnel committed
1078
    return (pos, target_name, u'.'.join(names), as_name)
William Stein's avatar
William Stein committed
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141

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()
    cond = p_simple_expr(s)
    if s.sy == ',':
        s.next()
        value = p_simple_expr(s)
    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()
    test = p_simple_expr(s)
    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()
    test = p_simple_expr(s)
    body = p_suite(s)
    else_clause = p_else_clause(s)
    return Nodes.WhileStatNode(pos, 
        condition = test, body = body, 
        else_clause = else_clause)

def p_for_statement(s):
    # s.sy == 'for'
    pos = s.position()
    s.next()
Robert Bradshaw's avatar
Robert Bradshaw committed
1142 1143 1144 1145 1146 1147
    kw = p_for_bounds(s)
    kw['body'] = p_suite(s)
    kw['else_clause'] = p_else_clause(s)
    return Nodes.ForStatNode(pos, **kw)
            
def p_for_bounds(s):
William Stein's avatar
William Stein committed
1148 1149 1150 1151
    target = p_for_target(s)
    if s.sy == 'in':
        s.next()
        iterator = p_for_iterator(s)
Robert Bradshaw's avatar
Robert Bradshaw committed
1152
        return { 'target': target, 'iterator': iterator }
Dag Sverre Seljebotn's avatar
Merge  
Dag Sverre Seljebotn committed
1153 1154 1155 1156 1157 1158 1159
    else:
        if s.sy == 'from':
            s.next()
            bound1 = p_bit_expr(s)
        else:
            # Support shorter "for a <= x < b" syntax
            bound1, target = target, None
William Stein's avatar
William Stein committed
1160 1161 1162 1163 1164 1165
        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)
1166
        step = p_for_from_step(s)
Dag Sverre Seljebotn's avatar
Merge  
Dag Sverre Seljebotn committed
1167 1168 1169 1170 1171 1172 1173 1174 1175
        if target is None:
            target = ExprNodes.NameNode(name2_pos, name = name2)
        else:
            if not target.is_name:
                error(target.pos, 
                    "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")
Stefan Behnel's avatar
Stefan Behnel committed
1176
        if rel1[0] != rel2[0]:
William Stein's avatar
William Stein committed
1177 1178
            error(rel2_pos,
                "Relation directions in for-from do not match")
Robert Bradshaw's avatar
Robert Bradshaw committed
1179 1180 1181 1182
        return {'target': target, 
                'bound1': bound1, 
                'relation1': rel1, 
                'relation2': rel2,
1183 1184
                'bound2': bound2,
                'step': step }
William Stein's avatar
William Stein committed
1185 1186 1187 1188 1189 1190 1191 1192

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 '<', '<=', '>' '>='")
1193

1194 1195 1196 1197 1198 1199 1200
def p_for_from_step(s):
    if s.sy == 'by':
        s.next()
        step = p_bit_expr(s)
        return step
    else:
        return None
William Stein's avatar
William Stein committed
1201 1202 1203

inequality_relations = ('<', '<=', '>', '>=')

1204
def p_target(s, terminator):
William Stein's avatar
William Stein committed
1205 1206 1207 1208 1209
    pos = s.position()
    expr = p_bit_expr(s)
    if s.sy == ',':
        s.next()
        exprs = [expr]
1210
        while s.sy != terminator:
William Stein's avatar
William Stein committed
1211
            exprs.append(p_bit_expr(s))
Stefan Behnel's avatar
Stefan Behnel committed
1212
            if s.sy != ',':
William Stein's avatar
William Stein committed
1213 1214 1215 1216 1217 1218
                break
            s.next()
        return ExprNodes.TupleNode(pos, args = exprs)
    else:
        return expr

1219 1220 1221
def p_for_target(s):
    return p_target(s, 'in')

William Stein's avatar
William Stein committed
1222 1223
def p_for_iterator(s):
    pos = s.position()
Robert Bradshaw's avatar
Robert Bradshaw committed
1224
    expr = p_testlist(s)
William Stein's avatar
William Stein committed
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
    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)
1240
        body = Nodes.TryExceptStatNode(pos,
William Stein's avatar
William Stein committed
1241 1242
            body = body, except_clauses = except_clauses,
            else_clause = else_clause)
1243 1244 1245 1246
        if s.sy != 'finally':
            return body
        # try-except-finally is equivalent to nested try-except/try-finally
    if s.sy == 'finally':
William Stein's avatar
William Stein committed
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
        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
Stefan Behnel's avatar
Stefan Behnel committed
1260
    if s.sy != ':':
William Stein's avatar
William Stein committed
1261 1262 1263 1264 1265 1266 1267 1268
        exc_type = p_simple_expr(s)
        if s.sy == ',':
            s.next()
            exc_value = p_simple_expr(s)
    body = p_suite(s)
    return Nodes.ExceptClauseNode(pos,
        pattern = exc_type, target = exc_value, body = body)

1269
def p_include_statement(s, ctx):
William Stein's avatar
William Stein committed
1270 1271 1272 1273
    pos = s.position()
    s.next() # 'include'
    _, include_file_name = p_string_literal(s)
    s.expect_newline("Syntax error in include statement")
1274 1275 1276
    if s.compile_time_eval:
        include_file_path = s.context.find_include_file(include_file_name, pos)
        if include_file_path:
1277
            s.included_files.append(include_file_name)
1278
            f = Utils.open_source_file(include_file_path, mode="rU")
1279
            source_desc = FileSourceDescriptor(include_file_path)
1280
            s2 = PyrexScanner(f, source_desc, s, source_encoding=f.encoding, parse_comments=s.parse_comments)
1281
            try:
1282
                tree = p_statement_list(s2, ctx)
1283 1284 1285 1286 1287
            finally:
                f.close()
            return tree
        else:
            return None
William Stein's avatar
William Stein committed
1288
    else:
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
        return Nodes.PassStatNode(pos)

def p_with_statement(s):
    pos = s.position()
    s.next() # 'with'
#	if s.sy == 'IDENT' and s.systring in ('gil', 'nogil'):
    if s.sy == 'IDENT' and s.systring == 'nogil':
        state = s.systring
        s.next()
        body = p_suite(s)
        return Nodes.GILStatNode(pos, state = state, body = body)
    else:
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
        manager = p_expr(s)
        target = None
        if s.sy == 'IDENT' and s.systring == 'as':
            s.next()
            allow_multi = (s.sy == '(')
            target = p_target(s, ':')
            if not allow_multi and isinstance(target, ExprNodes.TupleNode):
                s.error("Multiple with statement target values not allowed without paranthesis")
        body = p_suite(s)
	return Nodes.WithStatNode(pos, manager = manager, 
	       			       target = target, body = body)
William Stein's avatar
William Stein committed
1312
    
Stefan Behnel's avatar
Stefan Behnel committed
1313
def p_simple_statement(s, first_statement = 0):
William Stein's avatar
William Stein committed
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
    #print "p_simple_statement:", s.sy, s.systring ###
    if s.sy == 'global':
        node = p_global_statement(s)
    elif s.sy == 'print':
        node = p_print_statement(s)
    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':
Stefan Behnel's avatar
Stefan Behnel committed
1332
        node = p_from_import_statement(s, first_statement = first_statement)
William Stein's avatar
William Stein committed
1333 1334 1335 1336 1337 1338 1339 1340
    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

1341
def p_simple_statement_list(s, ctx, first_statement = 0):
William Stein's avatar
William Stein committed
1342 1343
    # Parse a series of simple statements on one line
    # separated by semicolons.
Stefan Behnel's avatar
Stefan Behnel committed
1344
    stat = p_simple_statement(s, first_statement = first_statement)
William Stein's avatar
William Stein committed
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
    if s.sy == ';':
        stats = [stat]
        while s.sy == ';':
            #print "p_simple_statement_list: maybe more to follow" ###
            s.next()
            if s.sy in ('NEWLINE', 'EOF'):
                break
            stats.append(p_simple_statement(s))
        stat = Nodes.StatListNode(stats[0].pos, stats = stats)
    s.expect_newline("Syntax error in simple statement list")
    return stat

1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
def p_compile_time_expr(s):
    old = s.compile_time_expr
    s.compile_time_expr = 1
    expr = p_expr(s)
    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)

1377
def p_IF_statement(s, ctx):
Dag Sverre Seljebotn's avatar
Merge  
Dag Sverre Seljebotn committed
1378
    pos = s.position()
1379 1380 1381 1382 1383 1384 1385 1386
    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))
1387
        body = p_suite(s, ctx)
1388 1389 1390
        if s.compile_time_eval:
            result = body
            current_eval = 0
Stefan Behnel's avatar
Stefan Behnel committed
1391
        if s.sy != 'ELIF':
1392 1393 1394 1395
            break
    if s.sy == 'ELSE':
        s.next()
        s.compile_time_eval = current_eval
1396
        body = p_suite(s, ctx)
1397 1398 1399
        if current_eval:
            result = body
    if not result:
Stefan Behnel's avatar
Stefan Behnel committed
1400
        result = Nodes.PassStatNode(pos)
1401 1402 1403
    s.compile_time_eval = saved_eval
    return result

1404 1405
def p_statement(s, ctx, first_statement = 0):
    cdef_flag = ctx.cdef_flag
William Stein's avatar
William Stein committed
1406
    if s.sy == 'ctypedef':
1407
        if ctx.level not in ('module', 'module_pxd'):
William Stein's avatar
William Stein committed
1408
            s.error("ctypedef statement not allowed here")
1409 1410
        #if ctx.api:
        #    error(s.position(), "'api' not allowed with 'ctypedef'")
1411
        return p_ctypedef_statement(s, ctx)
1412 1413 1414
    elif s.sy == 'DEF':
        return p_DEF_statement(s)
    elif s.sy == 'IF':
1415
        return p_IF_statement(s, ctx)
1416 1417 1418 1419 1420 1421 1422 1423
    elif s.sy == 'DECORATOR':
        if ctx.level not in ('module', 'class', 'c_class', 'property'):
            s.error('decorator not allowed here')
        s.level = ctx.level
        decorators = p_decorators(s)
        if s.sy != 'def':
            s.error("Decorators can only be followed by functions ")
        return p_def_statement(s, decorators)
William Stein's avatar
William Stein committed
1424
    else:
1425 1426 1427 1428
        overridable = 0
        if s.sy == 'cdef':
            cdef_flag = 1
            s.next()
Robert Bradshaw's avatar
Robert Bradshaw committed
1429
        if s.sy == 'cpdef':
1430 1431 1432 1433
            cdef_flag = 1
            overridable = 1
            s.next()
        if cdef_flag:
1434
            if ctx.level not in ('module', 'module_pxd', 'function', 'c_class', 'c_class_pxd'):
1435
                s.error('cdef statement not allowed here')
1436 1437
            s.level = ctx.level
            return p_cdef_statement(s, ctx(overridable = overridable))
William Stein's avatar
William Stein committed
1438
        else:
1439
            if ctx.api:
1440 1441
                error(s.pos, "'api' not allowed with this statement")
            elif s.sy == 'def':
1442
                if ctx.level not in ('module', 'class', 'c_class', 'c_class_pxd', 'property'):
1443
                    s.error('def statement not allowed here')
1444
                s.level = ctx.level
1445 1446
                return p_def_statement(s)
            elif s.sy == 'class':
1447
                if ctx.level != 'module':
1448 1449 1450
                    s.error("class definition not allowed here")
                return p_class_statement(s)
            elif s.sy == 'include':
1451
                if ctx.level not in ('module', 'module_pxd'):
1452
                    s.error("include statement not allowed here")
1453 1454
                return p_include_statement(s, ctx)
            elif ctx.level == 'c_class' and s.sy == 'IDENT' and s.systring == 'property':
1455
                return p_property_decl(s)
1456
            elif s.sy == 'pass' and ctx.level != 'property':
1457 1458
                return p_pass_statement(s, with_newline = 1)
            else:
1459
                if ctx.level in ('c_class_pxd', 'property'):
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
                    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)
                else:
1472 1473
                    return p_simple_statement_list(
                        s, ctx, first_statement = first_statement)
William Stein's avatar
William Stein committed
1474

1475
def p_statement_list(s, ctx, first_statement = 0):
William Stein's avatar
William Stein committed
1476 1477 1478 1479
    # Parse a series of statements separated by newlines.
    pos = s.position()
    stats = []
    while s.sy not in ('DEDENT', 'EOF'):
1480
        stats.append(p_statement(s, ctx, first_statement = first_statement))
Stefan Behnel's avatar
Stefan Behnel committed
1481
        first_statement = 0
1482 1483 1484 1485
    if len(stats) == 1:
        return stats[0]
    else:
        return Nodes.StatListNode(pos, stats = stats)
William Stein's avatar
William Stein committed
1486

1487
def p_suite(s, ctx = Ctx(), with_doc = 0, with_pseudo_doc = 0):
William Stein's avatar
William Stein committed
1488 1489 1490 1491 1492 1493 1494
    pos = s.position()
    s.expect(':')
    doc = None
    stmts = []
    if s.sy == 'NEWLINE':
        s.next()
        s.expect_indent()
1495
        if with_doc or with_pseudo_doc:
William Stein's avatar
William Stein committed
1496
            doc = p_doc_string(s)
1497
        body = p_statement_list(s, ctx)
William Stein's avatar
William Stein committed
1498 1499
        s.expect_dedent()
    else:
1500
        if ctx.api:
1501
            error(s.pos, "'api' not allowed with this statement")
1502 1503
        if ctx.level in ('module', 'class', 'function', 'other'):
            body = p_simple_statement_list(s, ctx)
William Stein's avatar
William Stein committed
1504 1505 1506 1507 1508 1509 1510 1511
        else:
            body = p_pass_statement(s)
            s.expect_newline("Syntax error in declarations")
    if with_doc:
        return doc, body
    else:
        return body

1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
def p_positional_and_keyword_args(s, end_sy_set, type_positions=(), type_keywords=()):
    """
    Parses positional and keyword arguments. end_sy_set
    should contain any s.sy that terminate the argument list.
    Argument expansion (* and **) are not allowed.

    type_positions and type_keywords specifies which argument
    positions and/or names which should be interpreted as
    types. Other arguments will be treated as expressions.

    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.')

        was_keyword = False
        parsed_type = False
        if s.sy == 'IDENT':
            # Since we can have either types or expressions as positional args,
            # we use a strategy of looking an extra step forward for a '=' and
            # if it is a positional arg we backtrack.
            ident = s.systring
            s.next()
            if s.sy == '=':
                s.next()
                # Is keyword arg
                if ident in type_keywords:
                    arg = p_c_base_type(s)
                    parsed_type = True
                else:
                    arg = p_simple_expr(s)
                keyword_node = ExprNodes.IdentifierStringNode(arg.pos,
1549
                                value = EncodedString(ident))
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
                keyword_args.append((keyword_node, arg))
                was_keyword = True
            else:
                s.put_back('IDENT', ident)
                
        if not was_keyword:
            if pos_idx in type_positions:
                arg = p_c_base_type(s)
                parsed_type = True
            else:
                arg = p_simple_expr(s)
            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:
                    s.error("Expected: type")
                else:
                    s.error("Expected: expression")
            break
        s.next()
    return positional_args, keyword_args

1577
def p_c_base_type(s, self_flag = 0, nonempty = 0):
William Stein's avatar
William Stein committed
1578 1579 1580 1581 1582
    # 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:
1583
        return p_c_simple_base_type(s, self_flag, nonempty = nonempty)
William Stein's avatar
William Stein committed
1584

1585 1586 1587 1588 1589 1590 1591 1592 1593 1594
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 ""

calling_convention_words = ("__stdcall", "__cdecl")

William Stein's avatar
William Stein committed
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604
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(')')
    return Nodes.CComplexBaseTypeNode(pos, 
        base_type = base_type, declarator = declarator)

1605
def p_c_simple_base_type(s, self_flag, nonempty):
1606
    #print "p_c_simple_base_type: self_flag =", self_flag, nonempty
William Stein's avatar
William Stein committed
1607 1608 1609 1610
    is_basic = 0
    signed = 1
    longness = 0
    module_path = []
1611
    pos = s.position()
William Stein's avatar
William Stein committed
1612 1613 1614 1615 1616 1617 1618 1619 1620
    if looking_at_base_type(s):
        #print "p_c_simple_base_type: looking_at_base_type at", s.position()
        is_basic = 1
        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:
            name = 'int'
1621 1622 1623 1624 1625 1626 1627 1628
    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)
1629
    else:
1630 1631 1632
        name = s.systring
        s.next()
        if nonempty and s.sy != 'IDENT':
1633
            # Make sure this is not a declaration of a variable or function.  
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644
            if s.sy == '(':
                s.next()
                if s.sy == '*' or s.sy == '**':
                    s.put_back('(', '(')
                else:
                    s.put_back('(', '(')
                    s.put_back('IDENT', name)
                    name = None
            elif s.sy not in ('*', '**', '['):
                s.put_back('IDENT', name)
                name = None
1645
    
1646
    type_node = Nodes.CSimpleBaseTypeNode(pos, 
William Stein's avatar
William Stein committed
1647 1648 1649 1650
        name = name, module_path = module_path,
        is_basic_c_type = is_basic, signed = signed,
        longness = longness, is_self_arg = self_flag)

1651

1652 1653 1654 1655 1656 1657 1658
    # Treat trailing [] on type as buffer access if it appears in a context
    # where declarator names are required (so that it cannot mean int[] or
    # sizeof(int[SIZE]))...
    #
    # (This means that buffers cannot occur where there can be empty declarators,
    # which is an ok restriction to make.)
    if nonempty and s.sy == '[':
1659
        return p_buffer_access(s, type_node)
1660 1661 1662
    else:
        return type_node

1663
def p_buffer_access(s, base_type_node):
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
    # s.sy == '['
    pos = s.position()
    s.next()
    positional_args, keyword_args = (
        p_positional_and_keyword_args(s, (']',), (0,), ('dtype',))
    )
    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
        ])

    result = Nodes.CBufferAccessTypeNode(pos,
        positional_args = positional_args,
        keyword_args = keyword_dict,
1681
        base_type_node = base_type_node)
1682 1683 1684
    return result
    

1685
def looking_at_name(s):
1686 1687
    return s.sy == 'IDENT' and not s.systring in calling_convention_words

1688
def looking_at_expr(s):
1689
    if s.systring in base_type_start_words:
1690
        return False
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700
    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
1701 1702 1703
        if s.sy == 'IDENT':
            is_type = True
        elif s.sy == '*' or s.sy == '**':
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
            s.next()
            is_type = s.sy == ')'
            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)
1720
        return not is_type
1721
    else:
1722
        return True
William Stein's avatar
William Stein committed
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736

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
1737
        
1738
basic_c_type_names = ("void", "char", "int", "float", "double", "Py_ssize_t", "bint")
William Stein's avatar
William Stein committed
1739 1740 1741

sign_and_longness_words = ("short", "long", "signed", "unsigned")

1742 1743
base_type_start_words = \
    basic_c_type_names + sign_and_longness_words
William Stein's avatar
William Stein committed
1744 1745 1746 1747 1748 1749 1750

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
1751 1752
        elif s.systring == 'signed':
            signed = 2
William Stein's avatar
William Stein committed
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
        elif s.systring == 'short':
            longness = -1
        elif s.systring == 'long':
            longness += 1
        s.next()
    return signed, longness

def p_opt_cname(s):
    literal = p_opt_string_literal(s)
    if literal:
        _, cname = literal
    else:
        cname = None
    return cname

1768 1769 1770
def p_c_declarator(s, ctx = Ctx(), empty = 0, is_type = 0, cmethod_flag = 0,
                   assignable = 0, nonempty = 0,
                   calling_convention_allowed = 0):
1771 1772
    # If empty is true, the declarator must be empty. If nonempty is true,
    # the declarator must be nonempty. Otherwise we don't care.
William Stein's avatar
William Stein committed
1773 1774 1775
    # If cmethod_flag is true, then if this declarator declares
    # a function, it's a C method of an extension type.
    pos = s.position()
1776 1777
    if s.sy == '(':
        s.next()
1778
        if s.sy == ')' or looking_at_name(s):
1779
            base = Nodes.CNameDeclaratorNode(pos, name = EncodedString(u""), cname = None)
1780
            result = p_c_func_declarator(s, pos, ctx, base, cmethod_flag)
1781
        else:
1782 1783 1784 1785
            result = p_c_declarator(s, ctx, empty = empty, is_type = is_type,
                                    cmethod_flag = cmethod_flag,
                                    nonempty = nonempty,
                                    calling_convention_allowed = 1)
1786 1787
            s.expect(')')
    else:
1788 1789
        result = p_c_simple_declarator(s, ctx, empty, is_type, cmethod_flag,
                                       assignable, nonempty)
Stefan Behnel's avatar
Stefan Behnel committed
1790
    if not calling_convention_allowed and result.calling_convention and s.sy != '(':
1791 1792 1793 1794 1795 1796 1797 1798
        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()
1799
            result = p_c_func_declarator(s, pos, ctx, result, cmethod_flag)
1800 1801 1802 1803 1804 1805
        cmethod_flag = 0
    return result

def p_c_array_declarator(s, base):
    pos = s.position()
    s.next() # '['
Stefan Behnel's avatar
Stefan Behnel committed
1806
    if s.sy != ']':
1807 1808 1809 1810 1811 1812
        dim = p_expr(s)
    else:
        dim = None
    s.expect(']')
    return Nodes.CArrayDeclaratorNode(pos, base = base, dimension = dim)

1813
def p_c_func_declarator(s, pos, ctx, base, cmethod_flag):
1814
    #  Opening paren has already been skipped
1815 1816
    args = p_c_arg_list(s, ctx, cmethod_flag = cmethod_flag,
                        nonempty_declarators = 0)
1817 1818 1819 1820 1821 1822 1823 1824
    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)
    return Nodes.CFuncDeclaratorNode(pos, 
        base = base, args = args, has_varargs = ellipsis,
        exception_value = exc_val, exception_check = exc_check,
1825
        nogil = nogil or ctx.nogil or with_gil, with_gil = with_gil)
1826

1827 1828
def p_c_simple_declarator(s, ctx, empty, is_type, cmethod_flag,
                          assignable, nonempty):
1829 1830
    pos = s.position()
    calling_convention = p_calling_convention(s)
William Stein's avatar
William Stein committed
1831 1832
    if s.sy == '*':
        s.next()
1833 1834 1835
        base = p_c_declarator(s, ctx, empty = empty, is_type = is_type,
                              cmethod_flag = cmethod_flag,
                              assignable = assignable, nonempty = nonempty)
William Stein's avatar
William Stein committed
1836 1837 1838 1839
        result = Nodes.CPtrDeclaratorNode(pos, 
            base = base)
    elif s.sy == '**': # scanner returns this as a single token
        s.next()
1840 1841 1842
        base = p_c_declarator(s, ctx, empty = empty, is_type = is_type,
                              cmethod_flag = cmethod_flag,
                              assignable = assignable, nonempty = nonempty)
William Stein's avatar
William Stein committed
1843 1844 1845 1846
        result = Nodes.CPtrDeclaratorNode(pos,
            base = Nodes.CPtrDeclaratorNode(pos,
                base = base))
    else:
1847 1848
        rhs = None
        if s.sy == 'IDENT':
1849
            name = EncodedString(s.systring)
1850 1851
            if empty:
                error(s.position(), "Declarator should be empty")
William Stein's avatar
William Stein committed
1852
            s.next()
1853
            cname = p_opt_cname(s)
1854 1855 1856
            if s.sy == '=' and assignable:
                s.next()
                rhs = p_simple_expr(s)
William Stein's avatar
William Stein committed
1857
        else:
1858 1859 1860 1861 1862
            if nonempty:
                error(s.position(), "Empty declarator")
            name = ""
            cname = None
        result = Nodes.CNameDeclaratorNode(pos,
Robert Bradshaw's avatar
Robert Bradshaw committed
1863
            name = name, cname = cname, default = rhs)
1864
    result.calling_convention = calling_convention
William Stein's avatar
William Stein committed
1865 1866
    return result

1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
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

William Stein's avatar
William Stein committed
1882 1883 1884 1885 1886 1887 1888 1889
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()
Felix Wu's avatar
Felix Wu committed
1890 1891 1892
        elif s.sy == '+':
            exc_check = '+'
            s.next()
Robert Bradshaw's avatar
Robert Bradshaw committed
1893 1894 1895 1896
            if s.sy == 'IDENT':
                name = s.systring
                s.next()
                exc_val = p_name(s, name)
William Stein's avatar
William Stein committed
1897 1898 1899 1900
        else:
            if s.sy == '?':
                exc_check = 1
                s.next()
1901
            exc_val = p_simple_expr(s)
William Stein's avatar
William Stein committed
1902 1903 1904 1905
    return exc_val, exc_check

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

1906 1907
def p_c_arg_list(s, ctx = Ctx(), in_pyfunc = 0, cmethod_flag = 0,
                 nonempty_declarators = 0, kw_only = 0):
1908 1909
    #  Comma-separated list of C argument declarations, possibly empty.
    #  May have a trailing comma.
William Stein's avatar
William Stein committed
1910
    args = []
1911 1912
    is_self_arg = cmethod_flag
    while s.sy not in c_arg_list_terminators:
1913
        args.append(p_c_arg_decl(s, ctx, in_pyfunc, is_self_arg,
1914 1915 1916 1917 1918
            nonempty = nonempty_declarators, kw_only = kw_only))
        if s.sy != ',':
            break
        s.next()
        is_self_arg = 0
William Stein's avatar
William Stein committed
1919 1920 1921 1922 1923 1924 1925 1926 1927
    return args

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

1928
def p_c_arg_decl(s, ctx, in_pyfunc, cmethod_flag = 0, nonempty = 0, kw_only = 0):
William Stein's avatar
William Stein committed
1929 1930 1931
    pos = s.position()
    not_none = 0
    default = None
1932
    base_type = p_c_base_type(s, cmethod_flag, nonempty = nonempty)
1933
    declarator = p_c_declarator(s, ctx, nonempty = nonempty)
William Stein's avatar
William Stein committed
1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
    if s.sy == 'not':
        s.next()
        if s.sy == 'IDENT' and s.systring == 'None':
            s.next()
        else:
            s.error("Expected 'None'")
        if not in_pyfunc:
            error(pos, "'not None' only allowed in Python functions")
        not_none = 1
    if s.sy == '=':
        s.next()
1945 1946 1947
        if 'pxd' in s.level:
            if s.sy not in ['*', '?']:
                error(pos, "default values cannot be specified in pxd files, use ? or *")
Robert Bradshaw's avatar
Robert Bradshaw committed
1948
            default = ExprNodes.BoolNode(1)
1949 1950 1951
            s.next()
        else:
            default = p_simple_expr(s)
William Stein's avatar
William Stein committed
1952 1953 1954 1955
    return Nodes.CArgDeclNode(pos,
        base_type = base_type,
        declarator = declarator,
        not_none = not_none,
1956 1957
        default = default,
        kw_only = kw_only)
William Stein's avatar
William Stein committed
1958

1959 1960 1961 1962 1963 1964 1965
def p_api(s):
    if s.sy == 'IDENT' and s.systring == 'api':
        s.next()
        return 1
    else:
        return 0

1966
def p_cdef_statement(s, ctx):
William Stein's avatar
William Stein committed
1967
    pos = s.position()
1968 1969 1970 1971 1972 1973 1974
    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)
Robert Bradshaw's avatar
Robert Bradshaw committed
1975 1976
    elif s.sy == 'import':
        s.next()
1977 1978 1979 1980 1981
        return p_cdef_extern_block(s, pos, ctx)
    if p_nogil(s):
        ctx.nogil = 1
    if s.sy == ':':
        return p_cdef_block(s, ctx)
William Stein's avatar
William Stein committed
1982
    elif s.sy == 'class':
1983
        if ctx.level not in ('module', 'module_pxd'):
William Stein's avatar
William Stein committed
1984
            error(pos, "Extension type definition not allowed here")
1985
        #if ctx.api:
Stefan Behnel's avatar
Stefan Behnel committed
1986
        #    error(pos, "'api' not allowed with extension class")
1987
        return p_c_class_definition(s, pos, ctx)
William Stein's avatar
William Stein committed
1988
    elif s.sy == 'IDENT' and s.systring in struct_union_or_enum:
1989
        if ctx.level not in ('module', 'module_pxd'):
William Stein's avatar
William Stein committed
1990
            error(pos, "C struct/union/enum definition not allowed here")
1991
        #if ctx.visibility == 'public':
1992
        #    error(pos, "Public struct/union/enum definition not implemented")
1993
        #if ctx.api:
Stefan Behnel's avatar
Stefan Behnel committed
1994
        #    error(pos, "'api' not allowed with '%s'" % s.systring)
William Stein's avatar
William Stein committed
1995
        if s.systring == "enum":
1996
            return p_c_enum_definition(s, pos, ctx)
William Stein's avatar
William Stein committed
1997
        else:
1998
            return p_c_struct_or_union_definition(s, pos, ctx)
William Stein's avatar
William Stein committed
1999 2000 2001 2002 2003
    elif s.sy == 'pass':
        node = p_pass_statement(s)
        s.expect_newline('Expected a newline')
        return node
    else:
2004
        return p_c_func_or_var_declaration(s, pos, ctx)
2005

2006 2007
def p_cdef_block(s, ctx):
    return p_suite(s, ctx(cdef_flag = 1))
William Stein's avatar
William Stein committed
2008

2009
def p_cdef_extern_block(s, pos, ctx):
William Stein's avatar
William Stein committed
2010 2011 2012 2013 2014 2015
    include_file = None
    s.expect('from')
    if s.sy == '*':
        s.next()
    else:
        _, include_file = p_string_literal(s)
2016 2017 2018 2019
    ctx = ctx(cdef_flag = 1, visibility = 'extern')
    if p_nogil(s):
        ctx.nogil = 1
    body = p_suite(s, ctx)
William Stein's avatar
William Stein committed
2020 2021 2022 2023 2024 2025 2026 2027
    return Nodes.CDefExternNode(pos,
        include_file = include_file,
        body = body)

struct_union_or_enum = (
    "struct", "union", "enum"
)

2028
def p_c_enum_definition(s, pos, ctx):
William Stein's avatar
William Stein committed
2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040
    # s.sy == ident 'enum'
    s.next()
    if s.sy == 'IDENT':
        name = s.systring
        s.next()
        cname = p_opt_cname(s)
    else:
        name = None
        cname = None
    items = None
    s.expect(':')
    items = []
Stefan Behnel's avatar
Stefan Behnel committed
2041
    if s.sy != 'NEWLINE':
William Stein's avatar
William Stein committed
2042 2043 2044 2045 2046 2047 2048
        p_c_enum_line(s, items)
    else:
        s.next() # 'NEWLINE'
        s.expect_indent()
        while s.sy not in ('DEDENT', 'EOF'):
            p_c_enum_line(s, items)
        s.expect_dedent()
2049 2050 2051 2052
    return Nodes.CEnumDefNode(
        pos, name = name, cname = cname, items = items,
        typedef_flag = ctx.typedef_flag, visibility = ctx.visibility,
        in_pxd = ctx.level == 'module_pxd')
William Stein's avatar
William Stein committed
2053 2054

def p_c_enum_line(s, items):
Stefan Behnel's avatar
Stefan Behnel committed
2055
    if s.sy != 'pass':
William Stein's avatar
William Stein committed
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076
        p_c_enum_item(s, items)
        while s.sy == ',':
            s.next()
            if s.sy in ('NEWLINE', 'EOF'):
                break
            p_c_enum_item(s, items)
    else:
        s.next()
    s.expect_newline("Syntax error in enum item list")

def p_c_enum_item(s, items):
    pos = s.position()
    name = p_ident(s)
    cname = p_opt_cname(s)
    value = None
    if s.sy == '=':
        s.next()
        value = p_simple_expr(s)
    items.append(Nodes.CEnumDefItemNode(pos, 
        name = name, cname = cname, value = value))

2077
def p_c_struct_or_union_definition(s, pos, ctx):
William Stein's avatar
William Stein committed
2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
    # s.sy == ident 'struct' or 'union'
    kind = s.systring
    s.next()
    name = p_ident(s)
    cname = p_opt_cname(s)
    attributes = None
    if s.sy == ':':
        s.next()
        s.expect('NEWLINE')
        s.expect_indent()
        attributes = []
2089
        body_ctx = Ctx()
Stefan Behnel's avatar
Stefan Behnel committed
2090 2091
        while s.sy != 'DEDENT':
            if s.sy != 'pass':
William Stein's avatar
William Stein committed
2092
                attributes.append(
2093
                    p_c_func_or_var_declaration(s, s.position(), body_ctx))
William Stein's avatar
William Stein committed
2094 2095 2096 2097 2098 2099 2100 2101
            else:
                s.next()
                s.expect_newline("Expected a newline")
        s.expect_dedent()
    else:
        s.expect_newline("Syntax error in struct or union definition")
    return Nodes.CStructOrUnionDefNode(pos, 
        name = name, cname = cname, kind = kind, attributes = attributes,
2102 2103
        typedef_flag = ctx.typedef_flag, visibility = ctx.visibility,
        in_pxd = ctx.level == 'module_pxd')
William Stein's avatar
William Stein committed
2104 2105 2106 2107 2108 2109

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
Stefan Behnel's avatar
Stefan Behnel committed
2110
        if prev_visibility != 'private' and visibility != prev_visibility:
William Stein's avatar
William Stein committed
2111 2112 2113 2114
            s.error("Conflicting visibility options '%s' and '%s'"
                % (prev_visibility, visibility))
        s.next()
    return visibility
2115 2116
    
def p_c_modifiers(s):
2117
    if s.sy == 'IDENT' and s.systring in ('inline',):
2118
        modifier = s.systring
2119
        s.next()
2120 2121
        return [modifier] + p_c_modifiers(s)
    return []
William Stein's avatar
William Stein committed
2122

2123 2124
def p_c_func_or_var_declaration(s, pos, ctx):
    cmethod_flag = ctx.level in ('c_class', 'c_class_pxd')
2125
    modifiers = p_c_modifiers(s)
2126
    base_type = p_c_base_type(s, nonempty = 1)
2127 2128 2129
    declarator = p_c_declarator(s, ctx, cmethod_flag = cmethod_flag,
                                assignable = 1, nonempty = 1)
    declarator.overridable = ctx.overridable
William Stein's avatar
William Stein committed
2130
    if s.sy == ':':
2131
        if ctx.level not in ('module', 'c_class'):
William Stein's avatar
William Stein committed
2132
            s.error("C function definition not allowed here")
2133
        doc, suite = p_suite(s, Ctx(level = 'function'), with_doc = 1)
William Stein's avatar
William Stein committed
2134
        result = Nodes.CFuncDefNode(pos,
2135
            visibility = ctx.visibility,
William Stein's avatar
William Stein committed
2136 2137
            base_type = base_type,
            declarator = declarator, 
2138
            body = suite,
2139
            doc = doc,
2140
            modifiers = modifiers,
2141 2142
            api = ctx.api,
            overridable = ctx.overridable)
William Stein's avatar
William Stein committed
2143
    else:
Stefan Behnel's avatar
Stefan Behnel committed
2144 2145
        #if api:
        #    error(s.pos, "'api' not allowed with variable declaration")
William Stein's avatar
William Stein committed
2146 2147 2148 2149 2150
        declarators = [declarator]
        while s.sy == ',':
            s.next()
            if s.sy == 'NEWLINE':
                break
2151 2152
            declarator = p_c_declarator(s, ctx, cmethod_flag = cmethod_flag,
                                        assignable = 1, nonempty = 1)
William Stein's avatar
William Stein committed
2153 2154 2155
            declarators.append(declarator)
        s.expect_newline("Syntax error in C variable declaration")
        result = Nodes.CVarDefNode(pos, 
2156 2157
            visibility = ctx.visibility,
            base_type = base_type,
2158
            declarators = declarators,
2159 2160 2161
            in_pxd = ctx.level == 'module_pxd',
            api = ctx.api,
            overridable = ctx.overridable)
William Stein's avatar
William Stein committed
2162 2163
    return result

2164
def p_ctypedef_statement(s, ctx):
William Stein's avatar
William Stein committed
2165 2166 2167
    # s.sy == 'ctypedef'
    pos = s.position()
    s.next()
2168
    visibility = p_visibility(s, ctx.visibility)
2169
    api = p_api(s)
2170
    ctx = ctx(typedef_flag = 1, visibility = visibility)
2171 2172
    if api:
        ctx.api = 1
William Stein's avatar
William Stein committed
2173
    if s.sy == 'class':
2174
        return p_c_class_definition(s, pos, ctx)
William Stein's avatar
William Stein committed
2175 2176
    elif s.sy == 'IDENT' and s.systring in ('struct', 'union', 'enum'):
        if s.systring == 'enum':
2177
            return p_c_enum_definition(s, pos, ctx)
William Stein's avatar
William Stein committed
2178
        else:
2179
            return p_c_struct_or_union_definition(s, pos, ctx)
William Stein's avatar
William Stein committed
2180
    else:
2181
        base_type = p_c_base_type(s, nonempty = 1)
2182 2183
        if base_type.name is None:
            s.error("Syntax error in ctypedef statement")
2184
        declarator = p_c_declarator(s, ctx, is_type = 1, nonempty = 1)
William Stein's avatar
William Stein committed
2185
        s.expect_newline("Syntax error in ctypedef statement")
2186 2187 2188 2189
        return Nodes.CTypeDefNode(
            pos, base_type = base_type,
            declarator = declarator, visibility = visibility,
            in_pxd = ctx.level == 'module_pxd')
William Stein's avatar
William Stein committed
2190

2191 2192 2193 2194 2195
def p_decorators(s):
    decorators = []
    while s.sy == 'DECORATOR':
        pos = s.position()
        s.next()
2196 2197
        decstring = p_dotted_name(s, as_allowed=0)[2]
        names = decstring.split('.')
2198
        decorator = ExprNodes.NameNode(pos, name=EncodedString(names[0]))
2199 2200
        for name in names[1:]:
            decorator = ExprNodes.AttributeNode(pos,
2201
                                           attribute=EncodedString(name),
2202
                                           obj=decorator)
2203 2204 2205 2206 2207 2208 2209
        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):
William Stein's avatar
William Stein committed
2210 2211 2212
    # s.sy == 'def'
    pos = s.position()
    s.next()
2213
    name = EncodedString( p_ident(s) )
2214
    #args = []
William Stein's avatar
William Stein committed
2215
    s.expect('(');
2216
    args = p_c_arg_list(s, in_pyfunc = 1, nonempty_declarators = 1)
William Stein's avatar
William Stein committed
2217 2218 2219 2220
    star_arg = None
    starstar_arg = None
    if s.sy == '*':
        s.next()
2221 2222
        if s.sy == 'IDENT':
            star_arg = p_py_arg_decl(s)
William Stein's avatar
William Stein committed
2223 2224
        if s.sy == ',':
            s.next()
2225 2226 2227 2228 2229
            args.extend(p_c_arg_list(s, in_pyfunc = 1,
                nonempty_declarators = 1, kw_only = 1))
        elif s.sy != ')':
            s.error("Syntax error in Python function argument list")
    if s.sy == '**':
William Stein's avatar
William Stein committed
2230 2231 2232
        s.next()
        starstar_arg = p_py_arg_decl(s)
    s.expect(')')
2233 2234
    if p_nogil(s):
        error(s.pos, "Python function cannot be declared nogil")
2235
    doc, body = p_suite(s, Ctx(level = 'function'), with_doc = 1)
William Stein's avatar
William Stein committed
2236 2237
    return Nodes.DefNode(pos, name = name, args = args, 
        star_arg = star_arg, starstar_arg = starstar_arg,
2238
        doc = doc, body = body, decorators = decorators)
William Stein's avatar
William Stein committed
2239 2240 2241 2242 2243 2244 2245 2246 2247 2248

def p_py_arg_decl(s):
    pos = s.position()
    name = p_ident(s)
    return Nodes.PyArgDeclNode(pos, name = name)

def p_class_statement(s):
    # s.sy == 'class'
    pos = s.position()
    s.next()
2249
    class_name = EncodedString( p_ident(s) )
2250
    class_name.encoding = s.source_encoding
William Stein's avatar
William Stein committed
2251 2252 2253 2254 2255 2256
    if s.sy == '(':
        s.next()
        base_list = p_simple_expr_list(s)
        s.expect(')')
    else:
        base_list = []
2257
    doc, body = p_suite(s, Ctx(level = 'class'), with_doc = 1)
William Stein's avatar
William Stein committed
2258 2259 2260 2261 2262
    return Nodes.PyClassDefNode(pos,
        name = class_name,
        bases = ExprNodes.TupleNode(pos, args = base_list),
        doc = doc, body = body)

2263
def p_c_class_definition(s, pos,  ctx):
William Stein's avatar
William Stein committed
2264 2265 2266 2267 2268 2269 2270 2271
    # 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)
2272
    if module_path and ctx.visibility != 'extern':
William Stein's avatar
William Stein committed
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294
        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 == '[':
2295
        if ctx.visibility not in ('public', 'extern'):
William Stein's avatar
William Stein committed
2296 2297 2298
            error(s.position(), "Name options only allowed for 'public' or 'extern' C class")
        objstruct_name, typeobj_name = p_c_class_options(s)
    if s.sy == ':':
2299
        if ctx.level == 'module_pxd':
William Stein's avatar
William Stein committed
2300 2301 2302
            body_level = 'c_class_pxd'
        else:
            body_level = 'c_class'
2303
        doc, body = p_suite(s, Ctx(level = body_level), with_doc = 1)
William Stein's avatar
William Stein committed
2304 2305 2306 2307
    else:
        s.expect_newline("Syntax error in C class definition")
        doc = None
        body = None
2308
    if ctx.visibility == 'extern':
William Stein's avatar
William Stein committed
2309 2310 2311 2312
        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")
2313
    elif ctx.visibility == 'public':
William Stein's avatar
William Stein committed
2314 2315 2316 2317
        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")
2318 2319
    elif ctx.visibility == 'private':
        if ctx.api:
Stefan Behnel's avatar
Stefan Behnel committed
2320
            error(pos, "Only 'public' C class can be declared 'api'")
2321
    else:
2322
        error(pos, "Invalid class visibility '%s'" % ctx.visibility)
William Stein's avatar
William Stein committed
2323
    return Nodes.CClassDefNode(pos,
2324 2325 2326
        visibility = ctx.visibility,
        typedef_flag = ctx.typedef_flag,
        api = ctx.api,
William Stein's avatar
William Stein committed
2327 2328 2329 2330 2331 2332 2333
        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,
2334
        in_pxd = ctx.level == 'module_pxd',
William Stein's avatar
William Stein committed
2335 2336 2337 2338 2339 2340 2341 2342
        doc = doc,
        body = body)

def p_c_class_options(s):
    objstruct_name = None
    typeobj_name = None
    s.expect('[')
    while 1:
Stefan Behnel's avatar
Stefan Behnel committed
2343
        if s.sy != 'IDENT':
William Stein's avatar
William Stein committed
2344 2345 2346 2347 2348 2349 2350
            break
        if s.systring == 'object':
            s.next()
            objstruct_name = p_ident(s)
        elif s.systring == 'type':
            s.next()
            typeobj_name = p_ident(s)
Stefan Behnel's avatar
Stefan Behnel committed
2351
        if s.sy != ',':
William Stein's avatar
William Stein committed
2352 2353 2354 2355 2356 2357 2358 2359 2360
            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)
2361
    doc, body = p_suite(s, Ctx(level = 'property'), with_doc = 1)
William Stein's avatar
William Stein committed
2362 2363 2364
    return Nodes.PropertyNode(pos, name = name, doc = doc, body = body)

def p_doc_string(s):
2365
    if s.sy == 'BEGIN_STRING':
2366 2367
        pos = s.position()
        kind, result = p_cat_string_literal(s)
Stefan Behnel's avatar
Stefan Behnel committed
2368
        if s.sy != 'EOF':
William Stein's avatar
William Stein committed
2369
            s.expect_newline("Syntax error in doc string")
2370 2371 2372 2373
        if kind != 'u':
            # warning(pos, "Python 3 requires docstrings to be unicode strings")
            if kind == 'b':
                result.encoding = None # force a unicode string
William Stein's avatar
William Stein committed
2374 2375 2376
        return result
    else:
        return None
2377 2378 2379 2380 2381 2382 2383
        
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
William Stein's avatar
William Stein committed
2384

2385
COMPILER_DIRECTIVE_COMMENT_RE = re.compile(r"^#\s*cython:\s*([a-z]+)\s*=(.*)$")
2386 2387

def p_compiler_directive_comments(s):
2388
    result = {}
2389 2390 2391 2392 2393 2394 2395
    while s.sy == 'commentline':
        m = COMPILER_DIRECTIVE_COMMENT_RE.match(s.systring)
        if m:
            name = m.group(1)
            try:
                value = Options.parse_option_value(str(name), str(m.group(2).strip()))
            except ValueError, e:
2396
                s.error(e.args[0], fatal=False)
2397 2398
            if value is not None: # can be False!
                result[name] = value
2399 2400 2401
        s.next()
    return result

2402
def p_module(s, pxd, full_module_name):
William Stein's avatar
William Stein committed
2403 2404 2405 2406 2407 2408
    pos = s.position()
    doc = p_doc_string(s)
    if pxd:
        level = 'module_pxd'
    else:
        level = 'module'
2409

2410 2411
    option_comments = p_compiler_directive_comments(s)
    s.parse_comments = False
2412
    body = p_statement_list(s, Ctx(level = level), first_statement = 1)
Stefan Behnel's avatar
Stefan Behnel committed
2413
    if s.sy != 'EOF':
William Stein's avatar
William Stein committed
2414 2415
        s.error("Syntax error in statement [%s,%s]" % (
            repr(s.sy), repr(s.systring)))
2416 2417 2418
    return ModuleNode(pos, doc = doc, body = body,
                      full_module_name = full_module_name,
                      option_comments = option_comments)
William Stein's avatar
William Stein committed
2419 2420 2421 2422 2423 2424 2425

#----------------------------------------------
#
#   Debugging
#
#----------------------------------------------

Stefan Behnel's avatar
Stefan Behnel committed
2426
def print_parse_tree(f, node, level, key = None):
2427
    from Nodes import Node
William Stein's avatar
William Stein committed
2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
    ind = "  " * level
    if node:
        f.write(ind)
        if key:
            f.write("%s: " % key)
        t = type(node)
        if t == TupleType:
            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():
Stefan Behnel's avatar
Stefan Behnel committed
2447
                if name != 'tag' and name != 'pos':
William Stein's avatar
William Stein committed
2448 2449 2450 2451 2452 2453 2454 2455 2456 2457
                    print_parse_tree(f, value, level+1, name)
            return
        elif t == ListType:
            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))