Add regexp_for_value helper method

lib/gitlab/dependency_linker/base_linker.rb

@@ -68,6 +68,19 @@ module Gitlab
       def highlighted_lines
         @highlighted_lines ||= highlighted_text.lines
       end
+
+      def regexp_for_value(value, default: /[^'"]+/)
+        case value
+        when Array
+          Regexp.union(value.map { |v| regexp_for_value(v, default: default) })
+        when String
+          Regexp.escape(value)
+        when Regexp
+          value
+        else
+          default
+        end
+      end
     end
   end
 end

lib/gitlab/dependency_linker/json_linker.rb

@@ -24,32 +24,13 @@ module Gitlab
       #   link_json('specific_package', '1.0.1', link: :key)
       #   # Will link `specific_package` in `"specific_package": "1.0.1"`
       def link_json(key, value = nil, link: :value, &url_proc)
-        key =
-          case key
-          when Array
-            Regexp.union(key.map { |name| Regexp.escape(name) })
-          when String
-            Regexp.escape(key)
-          when nil
-            '[^"]+'
-          else
-            key
-          end
-
-        value =
-          case value
-          when String
-            Regexp.escape(value)
-          when nil
-            '[^"]+'
-          else
-            value
-          end
+        key = regexp_for_value(key, default: /[^"]+/)
+        value = regexp_for_value(value, default: /[^"]+/)
 
         if link == :value
-          value = "(?<name>#{value})"
+          value = /(?<name>#{value})/
         else
-          key = "(?<name>#{key})"
+          key = /(?<name>#{key})/
         end
 
         link_regex(/"#{key}":\s*"#{value}"/, &url_proc)

lib/gitlab/dependency_linker/method_linker.rb

@@ -20,21 +20,12 @@ module Gitlab
       #
       #   link_method_call('name')
       #   # Will link `package` in `self.name = "package"`
-      def link_method_call(method_names, value = nil, &url_proc)
-        method_names = Array(method_names).map { |name| Regexp.escape(name) }
-
-        value =
-          case value
-          when String
-            Regexp.escape(value)
-          when nil
-            /[^'"]+/
-          else
-            value
-          end
+      def link_method_call(method_name, value = nil, &url_proc)
+        method_name = regexp_for_value(method_name)
+        value = regexp_for_value(value)
 
         regex = %r{
-          #{Regexp.union(method_names)} # Method name
+          #{method_name}            # Method name
           \s*                       # Whitespace
           [(=]?                     # Opening brace or equals sign
           \s*                       # Whitespace