Import .gyp files into the Chromium tree

webkit/build/action_maketokenizer.py

+#!/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: action_maketokenizer.py OUTPUTS -- INPUTS
+#
+# Multiple INPUTS may be listed.  The sections are separated by -- arguments.
+#
+# OUTPUTS must contain a single item: a path to tokenizer.cpp.
+#
+# INPUTS must contain exactly two items.  The first item must be the path to
+# maketokenizer.  The second item must be the path to tokenizer.flex.
+
+
+import os
+import subprocess
+import sys
+
+
+def SplitArgsIntoSections(args):
+  sections = []
+  while len(args) > 0:
+    if not '--' in args:
+      # If there is no '--' left, everything remaining is an entire section.
+      dashes = len(args)
+    else:
+      dashes = args.index('--')
+
+    sections.append(args[:dashes])
+
+    # Next time through the loop, look at everything after this '--'.
+    if dashes + 1 == len(args):
+      # If the '--' is at the end of the list, we won't come back through the
+      # loop again.  Add an empty section now corresponding to the nothingness
+      # following the final '--'.
+      args = []
+      sections.append(args)
+    else:
+      args = args[dashes + 1:]
+
+  return sections
+
+
+def main(args):
+  sections = SplitArgsIntoSections(args[1:])
+  assert len(sections) == 2
+  (outputs, inputs) = sections
+
+  assert len(outputs) == 1
+  output = outputs[0]
+
+  assert len(inputs) == 2
+  maketokenizer = inputs[0]
+  flex_input = inputs[1]
+
+  # Build up the command.
+  command = 'flex -t %s | perl %s > %s' % (flex_input, maketokenizer, output)
+
+  # Do it.  check_call is new in 2.5, so simulate its behavior with call and
+  # assert.
+  # TODO(mark): Don't use shell=True, build up the pipeline directly.
+  p = subprocess.Popen(command, shell=True)
+  return_code = p.wait()
+  assert return_code == 0
+
+  return return_code
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))