1 files changed, 75 insertions, 0 deletions
diff --git a/webkit/build/rule_bison.py b/webkit/build/rule_bison.py
new file mode 100755
index 0000000..5ba2b5a
--- /dev/null
+++ b/webkit/build/rule_bison.py
@@ -0,0 +1,75 @@
+#!/usr/bin/python
+
+# Copyright (c) 2009 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.
+
+# usage: rule_bison.py INPUT_FILE OUTPUT_DIR
+# INPUT_FILE is a path to either CSSGrammar.y or XPathGrammar.y.
+# OUTPUT_DIR is where the bison-generated .cpp and .h files should be placed.
+
+import errno
+import os
+import os.path
+import subprocess
+import sys
+
+assert len(sys.argv) == 3
+
+input_file = sys.argv[1]
+output_dir = sys.argv[2]
+
+input_name = os.path.basename(input_file)
+assert input_name == 'CSSGrammar.y' or input_name == 'XPathGrammar.y'
+prefix = {'CSSGrammar.y': 'cssyy', 'XPathGrammar.y': 'xpathyy'}[input_name]
+
+(input_root, input_ext) = os.path.splitext(input_name)
+
+# The generated .h will be in a different location depending on the bison
+# version.
+output_h_tries = [
+  os.path.join(output_dir, input_root + '.cpp.h'),
+  os.path.join(output_dir, input_root + '.hpp'),
+]
+
+for output_h_try in output_h_tries:
+  try:
+    os.unlink(output_h_try)
+  except OSError, e:
+    if e.errno != errno.ENOENT:
+      raise
+
+output_cpp = os.path.join(output_dir, input_root + '.cpp')
+
+return_code = subprocess.call(['bison', '-d', '-p', prefix, input_file,
+                               '-o', output_cpp])
+assert return_code == 0
+
+# Find the name that bison used for the generated header file.
+output_h_tmp = None
+for output_h_try in output_h_tries:
+  try:
+    os.stat(output_h_try)
+    output_h_tmp = output_h_try
+    break
+  except OSError, e:
+    if e.errno != errno.ENOENT:
+      raise
+
+assert output_h_tmp != None
+
+# Read the header file in under the generated name and remove it.
+output_h_file = open(output_h_tmp)
+output_h_contents = output_h_file.read()
+output_h_file.close()
+os.unlink(output_h_tmp)
+
+# Rewrite the generated header with #include guards.
+output_h = os.path.join(output_dir, input_root + '.h')
+
+output_h_file = open(output_h, 'w')
+print >>output_h_file, '#ifndef %s_h' % input_root
+print >>output_h_file, '#define %s_h' % input_root
+print >>output_h_file, output_h_contents
+print >>output_h_file, '#endif'
+output_h_file.close()