mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
52b56750a1
There's only one bindings system now. TBR=eseidel@chromium.org Review URL: https://codereview.chromium.org/915293003
144 lines
5.4 KiB
Python
144 lines
5.4 KiB
Python
# Copyright (C) 2013 Google Inc. All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met:
|
|
#
|
|
# * Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# * Redistributions in binary form must reproduce the above
|
|
# copyright notice, this list of conditions and the following disclaimer
|
|
# in the documentation and/or other materials provided with the
|
|
# distribution.
|
|
# * Neither the name of Google Inc. nor the names of its
|
|
# contributors may be used to endorse or promote products derived from
|
|
# this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
"""Lexer for Blink IDL.
|
|
|
|
The lexer uses the PLY (Python Lex-Yacc) library to build a tokenizer which
|
|
understands the Blink dialect of Web IDL and produces a token stream suitable
|
|
for the Blink IDL parser.
|
|
|
|
Blink IDL is identical to Web IDL at the token level, but the base lexer
|
|
does not discard comments. We need to override (and not include comments in
|
|
the token stream), as otherwise comments must be explicitly included in the
|
|
phrase grammar of the parser.
|
|
|
|
FIXME: Change base lexer to discard comments, and simply used the base
|
|
lexer, eliminating this separate lexer.
|
|
|
|
Web IDL:
|
|
http://www.w3.org/TR/WebIDL/
|
|
Web IDL Grammar:
|
|
http://www.w3.org/TR/WebIDL/#idl-grammar
|
|
PLY:
|
|
http://www.dabeaz.com/ply/
|
|
|
|
Design doc:
|
|
http://www.chromium.org/developers/design-documents/idl-compiler#TOC-Front-end
|
|
"""
|
|
|
|
# Disable attribute validation, as lint can't import parent class to check
|
|
# pylint: disable=E1101
|
|
|
|
import os.path
|
|
import sys
|
|
|
|
# PLY is in Chromium src/third_party/ply
|
|
module_path, module_name = os.path.split(__file__)
|
|
third_party = os.path.join(module_path, os.pardir, os.pardir, os.pardir, os.pardir)
|
|
# Insert at front to override system libraries, and after path[0] == script dir
|
|
sys.path.insert(1, third_party)
|
|
from ply import lex
|
|
|
|
# Base lexer is in Chromium src/tools/idl_parser
|
|
tools_dir = os.path.join(third_party, os.pardir, 'tools')
|
|
sys.path.append(tools_dir)
|
|
from idl_parser.idl_lexer import IDLLexer
|
|
|
|
LEXTAB = 'lextab'
|
|
REMOVE_TOKENS = ['COMMENT']
|
|
|
|
|
|
class BlinkIDLLexer(IDLLexer):
|
|
# ignore comments
|
|
def t_COMMENT(self, t):
|
|
r'(/\*(.|\n)*?\*/)|(//.*(\n[ \t]*//.*)*)'
|
|
self.AddLines(t.value.count('\n'))
|
|
|
|
# Analogs to _AddToken/_AddTokens in base lexer
|
|
# Needed to remove COMMENT token, since comments ignored
|
|
def _RemoveToken(self, token):
|
|
if token in self.tokens:
|
|
self.tokens.remove(token)
|
|
|
|
def _RemoveTokens(self, tokens):
|
|
for token in tokens:
|
|
self._RemoveToken(token)
|
|
|
|
def __init__(self, debug=False, optimize=True, outputdir=None,
|
|
rewrite_tables=False):
|
|
if debug:
|
|
# Turn off optimization and caching to help debugging
|
|
optimize = False
|
|
outputdir = None
|
|
if outputdir:
|
|
# Need outputdir in path because lex imports the cached lex table
|
|
# as a Python module
|
|
sys.path.append(outputdir)
|
|
|
|
if rewrite_tables:
|
|
tablefile_root = os.path.join(outputdir, LEXTAB)
|
|
# Also remove the .pyc/.pyo files, or they'll be used even if
|
|
# the .py file doesn't exist.
|
|
for ext in ('.py', '.pyc', '.pyo'):
|
|
try:
|
|
os.unlink(tablefile_root + ext)
|
|
except OSError:
|
|
pass
|
|
|
|
IDLLexer.__init__(self)
|
|
# Overrides to parent class
|
|
self._RemoveTokens(REMOVE_TOKENS)
|
|
# Optimized mode substantially decreases startup time (by disabling
|
|
# error checking), and also allows use of Python's optimized mode.
|
|
# See: Optimized Mode
|
|
# http://www.dabeaz.com/ply/ply.html#ply_nn15
|
|
self._lexobj = lex.lex(object=self,
|
|
debug=debug,
|
|
optimize=optimize,
|
|
lextab=LEXTAB,
|
|
outputdir=outputdir)
|
|
|
|
|
|
################################################################################
|
|
|
|
def main(argv):
|
|
# If file itself executed, build and cache lex table
|
|
try:
|
|
outputdir = argv[1]
|
|
except IndexError as err:
|
|
print 'Usage: %s OUTPUT_DIR' % argv[0]
|
|
return 1
|
|
# Important: rewrite_tables=True causes the cache file to be deleted if it
|
|
# exists, thus making sure that PLY doesn't load it instead of regenerating
|
|
# the parse table.
|
|
lexer = BlinkIDLLexer(outputdir=outputdir, rewrite_tables=True)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main(sys.argv))
|