IDL compiler: delete Perl compiler, remove unstable/ directory

Source/bindings/scripts/unstable/blink_idl_lexer.py

-# 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/
-"""
-
-# Disable attribute validation, as lint can't import parent class to check
-# pylint: disable=E1101
-
-import os.path
-import sys
-
-# Base lexer is in Chromium src/tools/idl_parser
-module_path, module_name = os.path.split(__file__)
-tools_dir = os.path.join(module_path, os.pardir, os.pardir, os.pardir, os.pardir, os.pardir, os.pardir, 'tools')
-sys.path.append(tools_dir)
-
-from idl_parser.idl_lexer import IDLLexer
-
-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):
-        IDLLexer.__init__(self)
-        self._RemoveTokens(REMOVE_TOKENS)
-
-
-# If run by itself, attempt to build the lexer
-if __name__ == '__main__':
-    lexer = BlinkIDLLexer()