tools/idl_parser/idl_parser.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """ Parser for PPAPI IDL """
   7
   8 #
   9 # IDL Parser
  10 #
  11 # The parser is uses the PLY yacc library to build a set of parsing rules based
  12 # on WebIDL.
  13 #
  14 # WebIDL, and WebIDL grammar can be found at:
  15 #   http://heycam.github.io/webidl/
  16 # PLY can be found at:
  17 #   http://www.dabeaz.com/ply/
  18 #
  19 # The parser generates a tree by recursively matching sets of items against
  20 # defined patterns.  When a match is made, that set of items is reduced
  21 # to a new item.   The new item can provide a match for parent patterns.
  22 # In this way an AST is built (reduced) depth first.
  23 #
  24
  25 #
  26 # Disable check for line length and Member as Function due to how grammar rules
  27 # are defined with PLY
  28 #
  29 # pylint: disable=R0201
  30 # pylint: disable=C0301
  31
  32 import os.path
  33 import sys
  34 import time
  35
  36 from idl_lexer import IDLLexer
  37 from idl_node import IDLAttribute, IDLNode
  38
  39 #
  40 # Try to load the ply module, if not, then assume it is in the third_party
  41 # directory.
  42 #
  43 try:
  44   # Disable lint check which fails to find the ply module.
  45   # pylint: disable=F0401
  46   from ply import lex
  47   from ply import yacc
  48 except ImportError:
  49   module_path, module_name = os.path.split(__file__)
  50   third_party = os.path.join(module_path, os.par, os.par, 'third_party')
  51   sys.path.append(third_party)
  52   # pylint: disable=F0401
  53   from ply import lex
  54   from ply import yacc
  55
  56 #
  57 # ERROR_REMAP
  58 #
  59 # Maps the standard error formula into a more friendly error message.
  60 #
  61 ERROR_REMAP = {
  62   'Unexpected ")" after "(".' : 'Empty argument list.',
  63   'Unexpected ")" after ",".' : 'Missing argument.',
  64   'Unexpected "}" after ",".' : 'Trailing comma in block.',
  65   'Unexpected "}" after "{".' : 'Unexpected empty block.',
  66   'Unexpected comment after "}".' : 'Unexpected trailing comment.',
  67   'Unexpected "{" after keyword "enum".' : 'Enum missing name.',
  68   'Unexpected "{" after keyword "struct".' : 'Struct missing name.',
  69   'Unexpected "{" after keyword "interface".' : 'Interface missing name.',
  70 }
  71
  72
  73 def Boolean(val):
  74   """Convert to strict boolean type."""
  75   if val:
  76     return True
  77   return False
  78
  79
  80 def ListFromConcat(*items):
  81   """Generate list by concatenating inputs"""
  82   itemsout = []
  83   for item in items:
  84     if item is None:
  85       continue
  86     if type(item) is not type([]):
  87       itemsout.append(item)
  88     else:
  89       itemsout.extend(item)
  90
  91   return itemsout
  92
  93 def ExpandProduction(p):
  94   if type(p) == list:
  95     return '[' + ', '.join([ExpandProduction(x) for x in p]) + ']'
  96   if type(p) == IDLNode:
  97     return 'Node:' + str(p)
  98   if type(p) == IDLAttribute:
  99     return 'Attr:' + str(p)
 100   if type(p) == str:
 101     return 'str:' + p
 102   return '%s:%s' % (p.__class__.__name__, str(p))
 103
 104 # TokenTypeName
 105 #
 106 # Generate a string which has the type and value of the token.
 107 #
 108 def TokenTypeName(t):
 109   if t.type == 'SYMBOL':
 110     return 'symbol %s' % t.value
 111   if t.type in ['HEX', 'INT', 'OCT', 'FLOAT']:
 112     return 'value %s' % t.value
 113   if t.type == 'string' :
 114     return 'string "%s"' % t.value
 115   if t.type == 'COMMENT' :
 116     return 'comment'
 117   if t.type == t.value:
 118     return '"%s"' % t.value
 119   if t.type == ',':
 120     return 'Comma'
 121   if t.type == 'identifier':
 122     return 'identifier "%s"' % t.value
 123   return 'keyword "%s"' % t.value
 124
 125
 126 #
 127 # IDL Parser
 128 #
 129 # The Parser inherits the from the Lexer to provide PLY with the tokenizing
 130 # definitions.  Parsing patterns are encoded as functions where p_<name> is
 131 # is called any time a patern matching the function documentation is found.
 132 # Paterns are expressed in the form of:
 133 # """ <new item> : <item> ....
 134 #                | <item> ...."""
 135 #
 136 # Where new item is the result of a match against one or more sets of items
 137 # separated by the "|".
 138 #
 139 # The function is called with an object 'p' where p[0] is the output object
 140 # and p[n] is the set of inputs for positive values of 'n'.  Len(p) can be
 141 # used to distinguish between multiple item sets in the pattern.
 142 #
 143 # For more details on parsing refer to the PLY documentation at
 144 #    http://www.dabeaz.com/ply/
 145 #
 146 # The parser is based on the WebIDL standard.  See:
 147 #    http://heycam.github.io/webidl/#idl-grammar
 148 #
 149 # The various productions are annotated so that the WHOLE number greater than
 150 # zero in the comment denotes the matching WebIDL grammar definition.
 151 #
 152 # Productions with a fractional component in the comment denote additions to
 153 # the WebIDL spec, such as comments.
 154 #
 155
 156
 157 class IDLParser(object):
 158 #
 159 # We force all input files to start with two comments.  The first comment is a
 160 # Copyright notice followed by a file comment and finally by file level
 161 # productions.
 162 #
 163   # [0] Insert a TOP definition for Copyright and Comments
 164   def p_Top(self, p):
 165     """Top : COMMENT COMMENT Definitions"""
 166     Copyright = self.BuildComment('Copyright', p, 1)
 167     Filedoc = self.BuildComment('Comment', p, 2)
 168     p[0] = ListFromConcat(Copyright, Filedoc, p[3])
 169
 170   # [0.1] Add support for Multiple COMMENTS
 171   def p_Comments(self, p):
 172     """Comments : CommentsRest"""
 173     if len(p) > 1:
 174       p[0] = p[1]
 175
 176   # [0.2] Produce a COMMENT and aggregate sibling comments
 177   def p_CommentsRest(self, p):
 178     """CommentsRest : COMMENT CommentsRest
 179                     | """
 180     if len(p) > 1:
 181       p[0] = ListFromConcat(self.BuildComment('Comment', p, 1), p[2])
 182
 183
 184 #
 185 #The parser is based on the WebIDL standard.  See:
 186 # http://heycam.github.io/webidl/#idl-grammar
 187 #
 188   # [1]
 189   def p_Definitions(self, p):
 190     """Definitions : ExtendedAttributeList Definition Definitions
 191            | """
 192     if len(p) > 1:
 193       p[2].AddChildren(p[1])
 194       p[0] = ListFromConcat(p[2], p[3])
 195
 196   # [2]
 197   def p_Definition(self, p):
 198     """Definition : CallbackOrInterface
 199                   | Partial
 200                   | Dictionary
 201                   | Exception
 202                   | Enum
 203                   | Typedef
 204                   | ImplementsStatement"""
 205     p[0] = p[1]
 206
 207   # [2.1] Error recovery for definition
 208   def p_DefinitionError(self, p):
 209     """Definition : error ';'"""
 210     p[0] = self.BuildError(p, 'Definition')
 211
 212   # [3]
 213   def p_CallbackOrInterface(self, p):
 214     """CallbackOrInterface : CALLBACK CallbackRestOrInterface
 215                            | Interface"""
 216     if len(p) > 2:
 217       p[0] = p[2]
 218     else:
 219       p[0] = p[1]
 220
 221   # [4]
 222   def p_CallbackRestOrInterface(self, p):
 223     """CallbackRestOrInterface : CallbackRest
 224                                | Interface"""
 225     p[0] = p[1]
 226
 227   # [5]
 228   def p_Interface(self, p):
 229     """Interface : INTERFACE identifier Inheritance '{' InterfaceMembers '}' ';'"""
 230     p[0] = self.BuildNamed('Interface', p, 2, ListFromConcat(p[3], p[5]))
 231
 232   # [6]
 233   def p_Partial(self, p):
 234     """Partial : PARTIAL PartialDefinition"""
 235     p[2].AddChildren(self.BuildTrue('Partial'))
 236     p[0] = p[2]
 237
 238   # [6.1] Error recovery for Partial
 239   def p_PartialError(self, p):
 240     """Partial : PARTIAL error"""
 241     p[0] = self.BuildError(p, 'Partial')
 242
 243   # [7]
 244   def p_PartialDefinition(self, p):
 245     """PartialDefinition : PartialDictionary
 246                          | PartialInterface"""
 247     p[0] = p[1]
 248
 249   # [8]
 250   def p_PartialInterface(self, p):
 251     """PartialInterface : INTERFACE identifier '{' InterfaceMembers '}' ';'"""
 252     p[0] = self.BuildNamed('Interface', p, 2, p[4])
 253
 254   # [9]
 255   def p_InterfaceMembers(self, p):
 256     """InterfaceMembers : ExtendedAttributeList InterfaceMember InterfaceMembers
 257                         |"""
 258     if len(p) > 1:
 259       p[2].AddChildren(p[1])
 260       p[0] = ListFromConcat(p[2], p[3])
 261
 262   # [10]
 263   def p_InterfaceMember(self, p):
 264     """InterfaceMember : Const
 265                        | AttributeOrOperationOrIterator"""
 266     p[0] = p[1]
 267
 268   # [10.1] Removed unsupported: Serializer
 269   def p_AttributeOrOperationOrIterator(self, p):
 270     """AttributeOrOperationOrIterator : Stringifier
 271                                       | StaticMember
 272                                       | ReadWriteAttribute
 273                                       | OperationOrIterator"""
 274     p[0] = p[1]
 275
 276   # [11]
 277   def p_Dictionary(self, p):
 278     """Dictionary : DICTIONARY identifier Inheritance '{' DictionaryMembers '}' ';'"""
 279     p[0] = self.BuildNamed('Dictionary', p, 2, ListFromConcat(p[3], p[5]))
 280
 281   # [11.1] Error recovery for regular Dictionary
 282   def p_DictionaryError(self, p):
 283     """Dictionary : DICTIONARY error ';'"""
 284     p[0] = self.BuildError(p, 'Dictionary')
 285
 286   # [12]
 287   def p_DictionaryMembers(self, p):
 288     """DictionaryMembers : ExtendedAttributeList DictionaryMember DictionaryMembers
 289                          |"""
 290     if len(p) > 1:
 291       p[2].AddChildren(p[1])
 292       p[0] = ListFromConcat(p[2], p[3])
 293
 294   # [13]
 295   def p_DictionaryMember(self, p):
 296     """DictionaryMember : Type identifier Default ';'"""
 297     p[0] = self.BuildNamed('Key', p, 2, ListFromConcat(p[1], p[3]))
 298
 299   # [14] NOT IMPLEMENTED (Required)
 300
 301   # [15]
 302   def p_PartialDictionary(self, p):
 303     """PartialDictionary : DICTIONARY identifier '{' DictionaryMembers '}' ';'"""
 304     partial = self.BuildTrue('Partial')
 305     p[0] = self.BuildNamed('Dictionary', p, 2, ListFromConcat(p[4], partial))
 306
 307   # [15.1] Error recovery for Partial Dictionary
 308   def p_PartialDictionaryError(self, p):
 309     """PartialDictionary : DICTIONARY error ';'"""
 310     p[0] = self.BuildError(p, 'PartialDictionary')
 311
 312   # [16]
 313   def p_Default(self, p):
 314     """Default : '=' DefaultValue
 315                |"""
 316     if len(p) > 1:
 317       p[0] = self.BuildProduction('Default', p, 2, p[2])
 318
 319   # [17]
 320   def p_DefaultValue(self, p):
 321     """DefaultValue : ConstValue
 322                     | string"""
 323     if type(p[1]) == str:
 324       p[0] = ListFromConcat(self.BuildAttribute('TYPE', 'DOMString'),
 325                             self.BuildAttribute('NAME', p[1]))
 326     else:
 327       p[0] = p[1]
 328
 329   # [] - Not specified
 330   def p_Exception(self, p):
 331     """Exception : EXCEPTION identifier Inheritance '{' ExceptionMembers '}' ';'"""
 332     p[0] = self.BuildNamed('Exception', p, 2, ListFromConcat(p[3], p[5]))
 333
 334   # [] - Not specified
 335   def p_ExceptionMembers(self, p):
 336     """ExceptionMembers : ExtendedAttributeList ExceptionMember ExceptionMembers
 337                         |"""
 338     if len(p) > 1:
 339       p[2].AddChildren(p[1])
 340       p[0] = ListFromConcat(p[2], p[3])
 341
 342   # [.1] Error recovery for ExceptionMembers - Not specified
 343   def p_ExceptionMembersError(self, p):
 344     """ExceptionMembers : error"""
 345     p[0] = self.BuildError(p, 'ExceptionMembers')
 346
 347   # [18]
 348   def p_Inheritance(self, p):
 349     """Inheritance : ':' identifier
 350                    |"""
 351     if len(p) > 1:
 352       p[0] = self.BuildNamed('Inherit', p, 2)
 353
 354   # [19]
 355   def p_Enum(self, p):
 356     """Enum : ENUM identifier '{' EnumValueList '}' ';'"""
 357     p[0] = self.BuildNamed('Enum', p, 2, p[4])
 358
 359   # [19.1] Error recovery for Enums
 360   def p_EnumError(self, p):
 361     """Enum : ENUM error ';'"""
 362     p[0] = self.BuildError(p, 'Enum')
 363
 364   # [20]
 365   def p_EnumValueList(self, p):
 366     """EnumValueList : ExtendedAttributeList string EnumValueListComma"""
 367     enum = self.BuildNamed('EnumItem', p, 2, p[1])
 368     p[0] = ListFromConcat(enum, p[3])
 369
 370   # [21]
 371   def p_EnumValueListComma(self, p):
 372     """EnumValueListComma : ',' EnumValueListString
 373                           |"""
 374     if len(p) > 1:
 375       p[0] = p[2]
 376
 377   # [22]
 378   def p_EnumValueListString(self, p):
 379     """EnumValueListString : ExtendedAttributeList string EnumValueListComma
 380                            |"""
 381     if len(p) > 1:
 382       enum = self.BuildNamed('EnumItem', p, 2, p[1])
 383       p[0] = ListFromConcat(enum, p[3])
 384
 385   # [23]
 386   def p_CallbackRest(self, p):
 387     """CallbackRest : identifier '=' ReturnType '(' ArgumentList ')' ';'"""
 388     arguments = self.BuildProduction('Arguments', p, 4, p[5])
 389     p[0] = self.BuildNamed('Callback', p, 1, ListFromConcat(p[3], arguments))
 390
 391   # [24]
 392   def p_Typedef(self, p):
 393     """Typedef : TYPEDEF ExtendedAttributeListNoComments Type identifier ';'"""
 394     p[0] = self.BuildNamed('Typedef', p, 4, ListFromConcat(p[2], p[3]))
 395
 396   # [24.1] Error recovery for Typedefs
 397   def p_TypedefError(self, p):
 398     """Typedef : TYPEDEF error ';'"""
 399     p[0] = self.BuildError(p, 'Typedef')
 400
 401   # [25]
 402   def p_ImplementsStatement(self, p):
 403     """ImplementsStatement : identifier IMPLEMENTS identifier ';'"""
 404     name = self.BuildAttribute('REFERENCE', p[3])
 405     p[0] = self.BuildNamed('Implements', p, 1, name)
 406
 407   # [26]
 408   def p_Const(self,  p):
 409     """Const : CONST ConstType identifier '=' ConstValue ';'"""
 410     value = self.BuildProduction('Value', p, 5, p[5])
 411     p[0] = self.BuildNamed('Const', p, 3, ListFromConcat(p[2], value))
 412
 413   # [27]
 414   def p_ConstValue(self, p):
 415     """ConstValue : BooleanLiteral
 416                   | FloatLiteral
 417                   | integer
 418                   | null"""
 419     if type(p[1]) == str:
 420       p[0] = ListFromConcat(self.BuildAttribute('TYPE', 'integer'),
 421                             self.BuildAttribute('NAME', p[1]))
 422     else:
 423       p[0] = p[1]
 424
 425   # [27.1] Add definition for NULL
 426   def p_null(self, p):
 427     """null : NULL"""
 428     p[0] = ListFromConcat(self.BuildAttribute('TYPE', 'NULL'),
 429                           self.BuildAttribute('NAME', 'NULL'))
 430
 431   # [28]
 432   def p_BooleanLiteral(self, p):
 433     """BooleanLiteral : TRUE
 434                       | FALSE"""
 435     value = self.BuildAttribute('VALUE', Boolean(p[1] == 'true'))
 436     p[0] = ListFromConcat(self.BuildAttribute('TYPE', 'boolean'), value)
 437
 438   # [29]
 439   def p_FloatLiteral(self, p):
 440     """FloatLiteral : float
 441                     | '-' INFINITY
 442                     | INFINITY
 443                     | NAN """
 444     if len(p) > 2:
 445       val = '-Infinity'
 446     else:
 447       val = p[1]
 448     p[0] = ListFromConcat(self.BuildAttribute('TYPE', 'float'),
 449                           self.BuildAttribute('VALUE', val))
 450
 451   # [30-34] NOT IMPLEMENTED (Serializer)
 452
 453   # [35]
 454   def p_Stringifier(self, p):
 455     """Stringifier : STRINGIFIER StringifierRest"""
 456     p[0] = self.BuildProduction('Stringifier', p, 1, p[2])
 457
 458   # [36]
 459   def p_StringifierRest(self, p):
 460     """StringifierRest : AttributeRest
 461                        | ReturnType OperationRest
 462                        | ';'"""
 463     if len(p) == 3:
 464       p[2].AddChildren(p[1])
 465       p[0] = p[2]
 466     elif p[1] != ';':
 467       p[0] = p[1]
 468
 469   # [37]
 470   def p_StaticMember(self, p):
 471     """StaticMember : STATIC StaticMemberRest"""
 472     p[2].AddChildren(self.BuildTrue('STATIC'))
 473     p[0] = p[2]
 474
 475   # [38]
 476   def p_StaticMemberRest(self, p):
 477     """StaticMemberRest : AttributeRest
 478                         | ReturnType OperationRest"""
 479     if len(p) == 2:
 480       p[0] = p[1]
 481     else:
 482       p[2].AddChildren(p[1])
 483       p[0] = p[2]
 484
 485   # [39] NOT IMPLEMENTED (ReadOnlyMember)
 486   # [40] NOT IMPLEMENTED (ReadOnlyMemberReset)
 487
 488   # [41]
 489   def p_ReadWriteAttribute(self, p):
 490     """ReadWriteAttribute : Inherit AttributeRest"""
 491     p[2].AddChildren(ListFromConcat(p[1]))
 492     p[0] = p[2]
 493
 494   # [41] Deprecated - Remove this entry after blink stops using it.
 495   def p_Attribute(self, p):
 496     """Attribute : ReadWriteAttribute"""
 497     p[0] = p[1]
 498
 499   # [42]
 500   def p_AttributeRest(self, p):
 501     """AttributeRest : ReadOnly ATTRIBUTE Type identifier ';'"""
 502     p[0] = self.BuildNamed('Attribute', p, 4,
 503                            ListFromConcat(p[1], p[3]))
 504
 505   # [43] NOT IMPLEMENTED (AttributeName)
 506   # [44] NOT IMPLEMENTED (AttributeNameKeyword)
 507
 508   # [45]
 509   def p_Inherit(self, p):
 510     """Inherit : INHERIT
 511                |"""
 512     if len(p) > 1:
 513       p[0] = self.BuildTrue('INHERIT')
 514
 515   # [46]
 516   def p_ReadOnly(self, p):
 517     """ReadOnly : READONLY
 518                 |"""
 519     if len(p) > 1:
 520       p[0] = self.BuildTrue('READONLY')
 521
 522   # [47]
 523   def p_OperationOrIterator(self, p):
 524     """OperationOrIterator : ReturnType OperationOrIteratorRest
 525                            | SpecialOperation"""
 526     if len(p) == 3:
 527       p[2].AddChildren(p[1])
 528       p[0] = p[2]
 529     else:
 530       p[0] = p[1]
 531
 532   # [48]
 533   def p_SpecialOperation(self, p):
 534     """SpecialOperation : Special Specials ReturnType OperationRest"""
 535     p[4].AddChildren(ListFromConcat(p[1], p[2], p[3]))
 536     p[0] = p[4]
 537
 538   # [49]
 539   def p_Specials(self, p):
 540     """Specials : Special Specials
 541                 | """
 542     if len(p) > 1:
 543       p[0] = ListFromConcat(p[1], p[2])
 544
 545   # [50]
 546   def p_Special(self, p):
 547     """Special : GETTER
 548                | SETTER
 549                | CREATOR
 550                | DELETER
 551                | LEGACYCALLER"""
 552     p[0] = self.BuildTrue(p[1].upper())
 553
 554   # [51]
 555   def p_OperationOrIteratorRest(self, p):
 556     """OperationOrIteratorRest : OperationRest"""
 557     p[0] = p[1]
 558
 559   # [51]
 560   def p_OperationRest(self, p):
 561     """OperationRest : OptionalIdentifier '(' ArgumentList ')' ';'"""
 562     arguments = self.BuildProduction('Arguments', p, 2, p[3])
 563     p[0] = self.BuildNamed('Operation', p, 1, arguments)
 564
 565   # [52]
 566   def p_OptionalIdentifier(self, p):
 567     """OptionalIdentifier : identifier
 568                           |"""
 569     if len(p) > 1:
 570       p[0] = p[1]
 571     else:
 572       p[0] = '_unnamed_'
 573
 574   # [53]
 575   def p_ArgumentList(self, p):
 576     """ArgumentList : Argument Arguments
 577                     |"""
 578     if len(p) > 1:
 579       p[0] = ListFromConcat(p[1], p[2])
 580
 581   # [53.1] ArgumentList error recovery
 582   def p_ArgumentListError(self, p):
 583     """ArgumentList : error """
 584     p[0] = self.BuildError(p, 'ArgumentList')
 585
 586   # [54]
 587   def p_Arguments(self, p):
 588     """Arguments : ',' Argument Arguments
 589                  |"""
 590     if len(p) > 1:
 591       p[0] = ListFromConcat(p[2], p[3])
 592
 593   # [55]
 594   def p_Argument(self, p):
 595     """Argument : ExtendedAttributeList OptionalOrRequiredArgument"""
 596     p[2].AddChildren(p[1])
 597     p[0] = p[2]
 598
 599   # [56]
 600   def p_OptionalOrRequiredArgument(self, p):
 601     """OptionalOrRequiredArgument : OPTIONAL Type ArgumentName Default
 602                                   | Type Ellipsis ArgumentName"""
 603     if len(p) > 4:
 604       arg = self.BuildNamed('Argument', p, 3, ListFromConcat(p[2], p[4]))
 605       arg.AddChildren(self.BuildTrue('OPTIONAL'))
 606     else:
 607       arg = self.BuildNamed('Argument', p, 3, ListFromConcat(p[1], p[2]))
 608     p[0] = arg
 609
 610   # [57]
 611   def p_ArgumentName(self, p):
 612     """ArgumentName : ArgumentNameKeyword
 613                     | identifier"""
 614     p[0] = p[1]
 615
 616   # [58]
 617   def p_Ellipsis(self, p):
 618     """Ellipsis : ELLIPSIS
 619                 |"""
 620     if len(p) > 1:
 621       p[0] = self.BuildNamed('Argument', p, 1)
 622       p[0].AddChildren(self.BuildTrue('ELLIPSIS'))
 623
 624   # [] Unspecified
 625   def p_ExceptionMember(self, p):
 626     """ExceptionMember : Const
 627                        | ExceptionField"""
 628     p[0] = p[1]
 629
 630   # [] Unspecified
 631   def p_ExceptionField(self, p):
 632     """ExceptionField : Type identifier ';'"""
 633     p[0] = self.BuildNamed('ExceptionField', p, 2, p[1])
 634
 635   # [] Error recovery for ExceptionMembers - Unspecified
 636   def p_ExceptionFieldError(self, p):
 637     """ExceptionField : error"""
 638     p[0] = self.BuildError(p, 'ExceptionField')
 639
 640   # [59] NOT IMPLEMENTED (Iterable)
 641   # [60] NOT IMPLEMENTED (OptionalType)
 642   # [61] NOT IMPLEMENTED (ReadWriteMaplike)
 643   # [62] NOT IMPLEMENTED (ReadWriteSetlike)
 644   # [63] NOT IMPLEMENTED (MaplikeRest)
 645   # [64] NOT IMPLEMENTED (SetlikeRest)
 646
 647   # [65] No comment version for mid statement attributes.
 648   def p_ExtendedAttributeListNoComments(self, p):
 649     """ExtendedAttributeListNoComments : '[' ExtendedAttribute ExtendedAttributes ']'
 650                                        | """
 651     if len(p) > 2:
 652       items = ListFromConcat(p[2], p[3])
 653       p[0] = self.BuildProduction('ExtAttributes', p, 1, items)
 654
 655   # [65.1] Add optional comment field for start of statements.
 656   def p_ExtendedAttributeList(self, p):
 657     """ExtendedAttributeList : Comments '[' ExtendedAttribute ExtendedAttributes ']'
 658                              | Comments """
 659     if len(p) > 2:
 660       items = ListFromConcat(p[3], p[4])
 661       attribs = self.BuildProduction('ExtAttributes', p, 2, items)
 662       p[0] = ListFromConcat(p[1], attribs)
 663     else:
 664       p[0] = p[1]
 665
 666   # [66]
 667   def p_ExtendedAttributes(self, p):
 668     """ExtendedAttributes : ',' ExtendedAttribute ExtendedAttributes
 669                           |"""
 670     if len(p) > 1:
 671       p[0] = ListFromConcat(p[2], p[3])
 672
 673   # We only support:
 674   #    [ identifier ]
 675   #    [ identifier ( ArgumentList ) ]
 676   #    [ identifier = identifier ]
 677   #    [ identifier = ( IdentifierList ) ]
 678   #    [ identifier = identifier ( ArgumentList ) ]
 679   # [66] map directly to [91-93, 95]
 680   # [67-69, 71] are unsupported
 681   def p_ExtendedAttribute(self, p):
 682     """ExtendedAttribute : ExtendedAttributeNoArgs
 683                          | ExtendedAttributeArgList
 684                          | ExtendedAttributeIdent
 685                          | ExtendedAttributeIdentList
 686                          | ExtendedAttributeNamedArgList"""
 687     p[0] = p[1]
 688
 689   # [71]
 690   def p_ArgumentNameKeyword(self, p):
 691     """ArgumentNameKeyword : ATTRIBUTE
 692                            | CALLBACK
 693                            | CONST
 694                            | CREATOR
 695                            | DELETER
 696                            | DICTIONARY
 697                            | ENUM
 698                            | EXCEPTION
 699                            | GETTER
 700                            | IMPLEMENTS
 701                            | INHERIT
 702                            | LEGACYCALLER
 703                            | PARTIAL
 704                            | SERIALIZER
 705                            | SETTER
 706                            | STATIC
 707                            | STRINGIFIER
 708                            | TYPEDEF
 709                            | UNRESTRICTED"""
 710     p[0] = p[1]
 711
 712   # [72] NOT IMPLEMENTED (OtherOrComma)
 713
 714   # [73]
 715   def p_Type(self, p):
 716     """Type : SingleType
 717             | UnionType TypeSuffix"""
 718     if len(p) == 2:
 719       p[0] = self.BuildProduction('Type', p, 1, p[1])
 720     else:
 721       p[0] = self.BuildProduction('Type', p, 1, ListFromConcat(p[1], p[2]))
 722
 723   # [74]
 724   def p_SingleType(self, p):
 725     """SingleType : NonAnyType
 726                   | ANY TypeSuffixStartingWithArray"""
 727     if len(p) == 2:
 728       p[0] = p[1]
 729     else:
 730       p[0] = ListFromConcat(self.BuildProduction('Any', p, 1), p[2])
 731
 732   # [75]
 733   def p_UnionType(self, p):
 734     """UnionType : '(' UnionMemberType OR UnionMemberType UnionMemberTypes ')'"""
 735
 736   # [76]
 737   def p_UnionMemberType(self, p):
 738     """UnionMemberType : NonAnyType
 739                        | UnionType TypeSuffix
 740                        | ANY '[' ']' TypeSuffix"""
 741   # [77]
 742   def p_UnionMemberTypes(self, p):
 743     """UnionMemberTypes : OR UnionMemberType UnionMemberTypes
 744                         |"""
 745
 746   # [78] Moved BYTESTRING, DOMSTRING, OBJECT, DATE, REGEXP to PrimitiveType
 747   # Moving all built-in types into PrimitiveType makes it easier to
 748   # differentiate between them and 'identifier', since p[1] would be a string in
 749   # both cases.
 750   def p_NonAnyType(self, p):
 751     """NonAnyType : PrimitiveType TypeSuffix
 752                   | PromiseType Null
 753                   | identifier TypeSuffix
 754                   | SEQUENCE '<' Type '>' Null"""
 755     if len(p) == 3:
 756       if type(p[1]) == str:
 757         typeref = self.BuildNamed('Typeref', p, 1)
 758       else:
 759         typeref = p[1]
 760       p[0] = ListFromConcat(typeref, p[2])
 761
 762     if len(p) == 6:
 763       p[0] = self.BuildProduction('Sequence', p, 1, ListFromConcat(p[3], p[5]))
 764
 765   # [79] NOT IMPLEMENTED (BufferRelatedType)
 766
 767   # [80]
 768   def p_ConstType(self,  p):
 769     """ConstType : PrimitiveType Null
 770                  | identifier Null"""
 771     if type(p[1]) == str:
 772       p[0] = self.BuildNamed('Typeref', p, 1, p[2])
 773     else:
 774       p[1].AddChildren(p[2])
 775       p[0] = p[1]
 776
 777
 778   # [81] Added BYTESTRING, DOMSTRING, OBJECT, DATE, REGEXP
 779   def p_PrimitiveType(self, p):
 780     """PrimitiveType : UnsignedIntegerType
 781                      | UnrestrictedFloatType
 782                      | BOOLEAN
 783                      | BYTE
 784                      | OCTET
 785                      | BYTESTRING
 786                      | DOMSTRING
 787                      | OBJECT
 788                      | DATE
 789                      | REGEXP"""
 790     if type(p[1]) == str:
 791       p[0] = self.BuildNamed('PrimitiveType', p, 1)
 792     else:
 793       p[0] = p[1]
 794
 795
 796   # [82]
 797   def p_UnrestrictedFloatType(self, p):
 798     """UnrestrictedFloatType : UNRESTRICTED FloatType
 799                              | FloatType"""
 800     if len(p) == 2:
 801       typeref = self.BuildNamed('PrimitiveType', p, 1)
 802     else:
 803       typeref = self.BuildNamed('PrimitiveType', p, 2)
 804       typeref.AddChildren(self.BuildTrue('UNRESTRICTED'))
 805     p[0] = typeref
 806
 807
 808   # [83]
 809   def p_FloatType(self, p):
 810     """FloatType : FLOAT
 811                  | DOUBLE"""
 812     p[0] = p[1]
 813
 814   # [84]
 815   def p_UnsignedIntegerType(self, p):
 816     """UnsignedIntegerType : UNSIGNED IntegerType
 817                            | IntegerType"""
 818     if len(p) == 2:
 819       p[0] = p[1]
 820     else:
 821       p[0] = 'unsigned ' + p[2]
 822
 823   # [85]
 824   def p_IntegerType(self, p):
 825     """IntegerType : SHORT
 826                    | LONG OptionalLong"""
 827     if len(p) == 2:
 828       p[0] = p[1]
 829     else:
 830       p[0] = p[1] + p[2]
 831
 832   # [86]
 833   def p_OptionalLong(self, p):
 834     """OptionalLong : LONG
 835                     | """
 836     if len(p) > 1:
 837       p[0] = ' ' + p[1]
 838     else:
 839       p[0] = ''
 840
 841   # [87] Add unqualified Promise
 842   def p_PromiseType(self, p):
 843     """PromiseType : PROMISE '<' ReturnType '>'
 844                    | PROMISE"""
 845     if len(p) == 2:
 846       # Promise without resolution type is not specified in the Web IDL spec.
 847       # As it is used in some specs and in the blink implementation,
 848       # we allow that here.
 849       resolution_type = self.BuildProduction('Type', p, 1,
 850                                              self.BuildProduction('Any', p, 1))
 851       p[0] = self.BuildNamed('Promise', p, 1, resolution_type)
 852     else:
 853       p[0] = self.BuildNamed('Promise', p, 1, p[3])
 854
 855   # [88] Add support for sized array
 856   def p_TypeSuffix(self, p):
 857     """TypeSuffix : '[' integer ']' TypeSuffix
 858                   | '[' ']' TypeSuffix
 859                   | '?' TypeSuffixStartingWithArray
 860                   | """
 861     if len(p) == 5:
 862       p[0] = self.BuildNamed('Array', p, 2, p[4])
 863
 864     if len(p) == 4:
 865       p[0] = self.BuildProduction('Array', p, 1, p[3])
 866
 867     if len(p) == 3:
 868       p[0] = ListFromConcat(self.BuildTrue('NULLABLE'), p[2])
 869
 870
 871   # [89]
 872   def p_TypeSuffixStartingWithArray(self, p):
 873     """TypeSuffixStartingWithArray : '[' ']' TypeSuffix
 874                                    | """
 875     if len(p) > 1:
 876       p[0] = self.BuildProduction('Array', p, 0, p[3])
 877
 878   # [90]
 879   def p_Null(self, p):
 880     """Null : '?'
 881             |"""
 882     if len(p) > 1:
 883       p[0] = self.BuildTrue('NULLABLE')
 884
 885   # [91]
 886   def p_ReturnType(self, p):
 887     """ReturnType : Type
 888                   | VOID"""
 889     if p[1] == 'void':
 890       p[0] = self.BuildProduction('Type', p, 1)
 891       p[0].AddChildren(self.BuildNamed('PrimitiveType', p, 1))
 892     else:
 893       p[0] = p[1]
 894
 895   # [92]
 896   def p_IdentifierList(self, p):
 897     """IdentifierList : identifier Identifiers"""
 898     p[0] = ListFromConcat(p[1], p[2])
 899
 900   # [93]
 901   def p_Identifiers(self, p):
 902     """Identifiers : ',' identifier Identifiers
 903                    |"""
 904     if len(p) > 1:
 905       p[0] = ListFromConcat(p[2], p[3])
 906
 907   # [94]
 908   def p_ExtendedAttributeNoArgs(self, p):
 909     """ExtendedAttributeNoArgs : identifier"""
 910     p[0] = self.BuildNamed('ExtAttribute', p, 1)
 911
 912   # [95]
 913   def p_ExtendedAttributeArgList(self, p):
 914     """ExtendedAttributeArgList : identifier '(' ArgumentList ')'"""
 915     arguments = self.BuildProduction('Arguments', p, 2, p[3])
 916     p[0] = self.BuildNamed('ExtAttribute', p, 1, arguments)
 917
 918   # [96]
 919   def p_ExtendedAttributeIdent(self, p):
 920     """ExtendedAttributeIdent : identifier '=' identifier"""
 921     value = self.BuildAttribute('VALUE', p[3])
 922     p[0] = self.BuildNamed('ExtAttribute', p, 1, value)
 923
 924   # [97]
 925   def p_ExtendedAttributeIdentList(self, p):
 926     """ExtendedAttributeIdentList : identifier '=' '(' IdentifierList ')'"""
 927     value = self.BuildAttribute('VALUE', p[4])
 928     p[0] = self.BuildNamed('ExtAttribute', p, 1, value)
 929
 930   # [98]
 931   def p_ExtendedAttributeNamedArgList(self, p):
 932     """ExtendedAttributeNamedArgList : identifier '=' identifier '(' ArgumentList ')'"""
 933     args = self.BuildProduction('Arguments', p, 4, p[5])
 934     value = self.BuildNamed('Call', p, 3, args)
 935     p[0] = self.BuildNamed('ExtAttribute', p, 1, value)
 936
 937 #
 938 # Parser Errors
 939 #
 940 # p_error is called whenever the parser can not find a pattern match for
 941 # a set of items from the current state.  The p_error function defined here
 942 # is triggered logging an error, and parsing recovery happens as the
 943 # p_<type>_error functions defined above are called.  This allows the parser
 944 # to continue so as to capture more than one error per file.
 945 #
 946   def p_error(self, t):
 947     if t:
 948       lineno = t.lineno
 949       pos = t.lexpos
 950       prev = self.yaccobj.symstack[-1]
 951       if type(prev) == lex.LexToken:
 952         msg = "Unexpected %s after %s." % (
 953             TokenTypeName(t), TokenTypeName(prev))
 954       else:
 955         msg = "Unexpected %s." % (t.value)
 956     else:
 957       last = self.LastToken()
 958       lineno = last.lineno
 959       pos = last.lexpos
 960       msg = "Unexpected end of file after %s." % TokenTypeName(last)
 961       self.yaccobj.restart()
 962
 963     # Attempt to remap the error to a friendlier form
 964     if msg in ERROR_REMAP:
 965       msg = ERROR_REMAP[msg]
 966
 967     self._last_error_msg = msg
 968     self._last_error_lineno = lineno
 969     self._last_error_pos = pos
 970
 971   def Warn(self, node, msg):
 972     sys.stdout.write(node.GetLogLine(msg))
 973     self.parse_warnings += 1
 974
 975   def LastToken(self):
 976     return self.lexer.last
 977
 978   def __init__(self, lexer, verbose=False, debug=False, mute_error=False):
 979     self.lexer = lexer
 980     self.tokens = lexer.KnownTokens()
 981     self.yaccobj = yacc.yacc(module=self, tabmodule=None, debug=debug,
 982                              optimize=0, write_tables=0)
 983     self.parse_debug = debug
 984     self.verbose = verbose
 985     self.mute_error = mute_error
 986     self._parse_errors = 0
 987     self._parse_warnings = 0
 988     self._last_error_msg = None
 989     self._last_error_lineno = 0
 990     self._last_error_pos = 0
 991
 992
 993 #
 994 # BuildProduction
 995 #
 996 # Production is the set of items sent to a grammar rule resulting in a new
 997 # item being returned.
 998 #
 999 # p - Is the Yacc production object containing the stack of items
1000 # index - Index into the production of the name for the item being produced.
1001 # cls - The type of item being producted
1002 # childlist - The children of the new item
1003   def BuildProduction(self, cls, p, index, childlist=None):
1004     try:
1005       if not childlist:
1006         childlist = []
1007
1008       filename = self.lexer.Lexer().filename
1009       lineno = p.lineno(index)
1010       pos = p.lexpos(index)
1011       out = IDLNode(cls, filename, lineno, pos, childlist)
1012       return out
1013     except:
1014       print 'Exception while parsing:'
1015       for num, item in enumerate(p):
1016         print '  [%d] %s' % (num, ExpandProduction(item))
1017       if self.LastToken():
1018         print 'Last token: %s' % str(self.LastToken())
1019       raise
1020
1021   def BuildNamed(self, cls, p, index, childlist=None):
1022     childlist = ListFromConcat(childlist)
1023     childlist.append(self.BuildAttribute('NAME', p[index]))
1024     return self.BuildProduction(cls, p, index, childlist)
1025
1026   def BuildComment(self, cls, p, index):
1027     name = p[index]
1028
1029     # Remove comment markers
1030     lines = []
1031     if name[:2] == '//':
1032       # For C++ style, remove any leading whitespace and the '//' marker from
1033       # each line.
1034       form = 'cc'
1035       for line in name.split('\n'):
1036         start = line.find('//')
1037         lines.append(line[start+2:])
1038     else:
1039       # For C style, remove ending '*/''
1040       form = 'c'
1041       for line in name[:-2].split('\n'):
1042         # Remove characters until start marker for this line '*' if found
1043         # otherwise it should be blank.
1044         offs = line.find('*')
1045         if offs >= 0:
1046           line = line[offs + 1:].rstrip()
1047         else:
1048           line = ''
1049         lines.append(line)
1050     name = '\n'.join(lines)
1051     childlist = [self.BuildAttribute('NAME', name),
1052                  self.BuildAttribute('FORM', form)]
1053     return self.BuildProduction(cls, p, index, childlist)
1054
1055 #
1056 # BuildError
1057 #
1058 # Build and Errror node as part of the recovery process.
1059 #
1060 #
1061   def BuildError(self, p, prod):
1062     self._parse_errors += 1
1063     name = self.BuildAttribute('NAME', self._last_error_msg)
1064     line = self.BuildAttribute('LINE', self._last_error_lineno)
1065     pos = self.BuildAttribute('POS', self._last_error_pos)
1066     prod = self.BuildAttribute('PROD', prod)
1067
1068     node = self.BuildProduction('Error', p, 1,
1069                                 ListFromConcat(name, line, pos, prod))
1070     if not self.mute_error:
1071       node.Error(self._last_error_msg)
1072
1073     return node
1074
1075 #
1076 # BuildAttribute
1077 #
1078 # An ExtendedAttribute is a special production that results in a property
1079 # which is applied to the adjacent item.  Attributes have no children and
1080 # instead represent key/value pairs.
1081 #
1082   def BuildAttribute(self, key, val):
1083     return IDLAttribute(key, val)
1084
1085   def BuildFalse(self, key):
1086     return IDLAttribute(key, Boolean(False))
1087
1088   def BuildTrue(self, key):
1089     return IDLAttribute(key, Boolean(True))
1090
1091   def GetErrors(self):
1092     # Access lexer errors, despite being private
1093     # pylint: disable=W0212
1094     return self._parse_errors + self.lexer._lex_errors
1095
1096 #
1097 # ParseData
1098 #
1099 # Attempts to parse the current data loaded in the lexer.
1100 #
1101   def ParseText(self, filename, data):
1102     self._parse_errors = 0
1103     self._parse_warnings = 0
1104     self._last_error_msg = None
1105     self._last_error_lineno = 0
1106     self._last_error_pos = 0
1107
1108     try:
1109       self.lexer.Tokenize(data, filename)
1110       nodes = self.yaccobj.parse(lexer=self.lexer) or []
1111       name = self.BuildAttribute('NAME', filename)
1112       return IDLNode('File', filename, 0, 0, nodes + [name])
1113
1114     except lex.LexError as lexError:
1115       sys.stderr.write('Error in token: %s\n' % str(lexError))
1116     return None
1117
1118
1119
1120 def ParseFile(parser, filename):
1121   """Parse a file and return a File type of node."""
1122   with open(filename) as fileobject:
1123     try:
1124       out = parser.ParseText(filename, fileobject.read())
1125       out.SetProperty('DATETIME', time.ctime(os.path.getmtime(filename)))
1126       out.SetProperty('ERRORS', parser.GetErrors())
1127       return out
1128
1129     except Exception as e:
1130       last = parser.LastToken()
1131       sys.stderr.write('%s(%d) : Internal parsing error\n\t%s.\n' % (
1132                        filename, last.lineno, str(e)))
1133
1134
1135 def main(argv):
1136   nodes = []
1137   parser = IDLParser(IDLLexer())
1138   errors = 0
1139   for filename in argv:
1140     filenode = ParseFile(parser, filename)
1141     if (filenode):
1142       errors += filenode.GetProperty('ERRORS')
1143       nodes.append(filenode)
1144
1145   ast = IDLNode('AST', '__AST__', 0, 0, nodes)
1146
1147   print '\n'.join(ast.Tree(accept_props=['PROD']))
1148   if errors:
1149     print '\nFound %d errors.\n' % errors
1150
1151   return errors
1152
1153
1154 if __name__ == '__main__':
1155   sys.exit(main(sys.argv[1:]))