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 """ Lexer for PPAPI IDL 7 8 The lexer uses the PLY library to build a tokenizer which understands both 9 WebIDL and Pepper tokens. 10 11 WebIDL, and WebIDL regular expressions can be found at: 12 http://www.w3.org/TR/2012/CR-WebIDL-20120419/ 13 PLY can be found at: 14 http://www.dabeaz.com/ply/ 15 """ 16 17 from idl_lexer import IDLLexer 18 19 20 # 21 # IDL PPAPI Lexer 22 # 23 class IDLPPAPILexer(IDLLexer): 24 # Token definitions 25 # 26 # These need to be methods for lexer construction, despite not using self. 27 # pylint: disable=R0201 28 29 # Special multi-character operators 30 def t_LSHIFT(self, t): 31 r'<<' 32 return t 33 34 def t_RSHIFT(self, t): 35 r'>>' 36 return t 37 38 def t_INLINE(self, t): 39 r'\#inline (.|\n)*?\#endinl.*' 40 self.AddLines(t.value.count('\n')) 41 return t 42 43 # Return a "preprocessor" inline block 44 def __init__(self): 45 IDLLexer.__init__(self) 46 self._AddTokens(['INLINE', 'LSHIFT', 'RSHIFT']) 47 self._AddKeywords(['label', 'struct']) 48 49 # Add number types 50 self._AddKeywords(['char', 'int8_t', 'int16_t', 'int32_t', 'int64_t']) 51 self._AddKeywords(['uint8_t', 'uint16_t', 'uint32_t', 'uint64_t']) 52 self._AddKeywords(['double_t', 'float_t']) 53 54 # Add handle types 55 self._AddKeywords(['handle_t', 'PP_FileHandle']) 56 57 # Add pointer types (void*, char*, const char*, const void*) 58 self._AddKeywords(['mem_t', 'str_t', 'cstr_t', 'interface_t']) 59 60 # Remove JS types 61 self._DelKeywords(['boolean', 'byte', 'ByteString', 'Date', 'DOMString', 62 'double', 'float', 'long', 'object', 'octet', 'RegExp', 63 'short', 'unsigned']) 64 65 66 # If run by itself, attempt to build the lexer 67 if __name__ == '__main__': 68 lexer = IDLPPAPILexer() 69 lexer.Tokenize(open('test_parser/inline_ppapi.idl').read()) 70 for tok in lexer.GetTokens(): 71 print '\n' + str(tok) 72
