1#!/usr/bin/python 2# 3# Copyright (C) 2009 Google Inc. All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions are 7# met: 8# 9# * Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# * Redistributions in binary form must reproduce the above 12# copyright notice, this list of conditions and the following disclaimer 13# in the documentation and/or other materials provided with the 14# distribution. 15# * Neither the name of Google Inc. nor the names of its 16# contributors may be used to endorse or promote products derived from 17# this software without specific prior written permission. 18# 19# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30# 31# Copyright (c) 2009 The Chromium Authors. All rights reserved. 32# Use of this source code is governed by a BSD-style license that can be 33# found in the LICENSE file. 34 35# usage: rule_bison.py INPUT_FILE OUTPUT_DIR 36# INPUT_FILE is a path to either CSSGrammar.y or XPathGrammar.y. 37# OUTPUT_DIR is where the bison-generated .cpp and .h files should be placed. 38 39import errno 40import os 41import os.path 42import subprocess 43import sys 44 45assert len(sys.argv) == 3 46 47inputFile = sys.argv[1] 48outputDir = sys.argv[2] 49 50inputName = os.path.basename(inputFile) 51assert inputName == 'CSSGrammar.y' or inputName == 'XPathGrammar.y' 52prefix = {'CSSGrammar.y': 'cssyy', 'XPathGrammar.y': 'xpathyy'}[inputName] 53 54(inputRoot, inputExt) = os.path.splitext(inputName) 55 56# The generated .h will be in a different location depending on the bison 57# version. 58outputHTries = [ 59 os.path.join(outputDir, inputRoot + '.cpp.h'), 60 os.path.join(outputDir, inputRoot + '.hpp'), 61] 62 63for outputHTry in outputHTries: 64 try: 65 os.unlink(outputHTry) 66 except OSError, e: 67 if e.errno != errno.ENOENT: 68 raise 69 70outputCpp = os.path.join(outputDir, inputRoot + '.cpp') 71 72returnCode = subprocess.call(['bison', '-d', '-p', prefix, inputFile, '-o', outputCpp]) 73assert returnCode == 0 74 75# Find the name that bison used for the generated header file. 76outputHTmp = None 77for outputHTry in outputHTries: 78 try: 79 os.stat(outputHTry) 80 outputHTmp = outputHTry 81 break 82 except OSError, e: 83 if e.errno != errno.ENOENT: 84 raise 85 86assert outputHTmp != None 87 88# Read the header file in under the generated name and remove it. 89outputHFile = open(outputHTmp) 90outputHContents = outputHFile.read() 91outputHFile.close() 92os.unlink(outputHTmp) 93 94# Rewrite the generated header with #include guards. 95outputH = os.path.join(outputDir, inputRoot + '.h') 96 97outputHFile = open(outputH, 'w') 98print >>outputHFile, '#ifndef %sH' % inputRoot 99print >>outputHFile, '#define %sH' % inputRoot 100print >>outputHFile, outputHContents 101print >>outputHFile, '#endif' 102outputHFile.close() 103