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# Copyright (c) 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
""" Lexer for PPAPI IDL
The lexer uses the PLY library to build a tokenizer which understands both
WebIDL and Pepper tokens.
WebIDL, and WebIDL regular expressions can be found at:
http://www.w3.org/TR/2012/CR-WebIDL-20120419/
PLY can be found at:
http://www.dabeaz.com/ply/
"""
from idl_lexer import IDLLexer
import optparse
import os.path
import sys
#
# IDL PPAPI Lexer
#
class IDLPPAPILexer(IDLLexer):
# 'tokens' is a value required by lex which specifies the complete list
# of valid token types. To WebIDL we add the following token types
IDLLexer.tokens += [
# Operators
'LSHIFT',
'RSHIFT',
# Pepper Extras
'INLINE',
]
# 'keywords' is a map of string to token type. All tokens matching
# KEYWORD_OR_SYMBOL are matched against keywords dictionary, to determine
# if the token is actually a keyword. Add the new keywords to the
# dictionary and set of tokens
ppapi_keywords = ['LABEL', 'NAMESPACE', 'STRUCT']
for keyword in ppapi_keywords:
IDLLexer.keywords[ keyword.lower() ] = keyword
IDLLexer.tokens.append(keyword)
# Special multi-character operators
t_LSHIFT = r'<<'
t_RSHIFT = r'>>'
# Return a "preprocessor" inline block
def t_INLINE(self, t):
r'\#inline (.|\n)*?\#endinl.*'
self.AddLines(t.value.count('\n'))
return t
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