Update idlsync.py to pull in dependencies required for chrome api generation.

third_party/chrome/ppapi/generators/idl_outfile.py

+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+""" Output file objects for generator. """
+
+import difflib
+import os
+import time
+import sys
+
+from idl_log import ErrOut, InfoOut, WarnOut
+from idl_option import GetOption, Option, ParseOptions
+from stat import *
+
+Option('diff', 'Generate a DIFF when saving the file.')
+
+def IsEquivalent(intext, outtext):
+  if not intext: return False
+  inlines = intext.split('\n')
+  outlines = outtext.split('\n')
+
+  # If number of lines don't match, it's a mismatch
+  if len(inlines) != len(outlines):  return False
+
+  for index in range(len(inlines)):
+    inline = inlines[index]
+    outline = outlines[index]
+
+    if inline == outline: continue
+
+    # If the line is not an exact match, check for comment deltas
+    inwords = inline.split()
+    outwords = outline.split()
+
+    if not inwords or not outwords: return False
+    if inwords[0] != outwords[0] or inwords[0] not in ('/*', '*', '//'):
+      return False
+
+    # Neither the year, nor the modified date need an exact match
+    if inwords[1] == 'Copyright':
+      if inwords[4:] == outwords[4:]: continue
+    elif inwords[1] == 'From': # Un-wrapped modified date.
+      if inwords[0:4] == outwords[0:4]: continue
+    elif inwords[1] == 'modified': # Wrapped modified date.
+      if inwords[0:2] == outwords[0:2]: continue
+    return False
+  return True
+
+
+#
+# IDLOutFile
+#
+# IDLOutFile provides a temporary output file.  By default, the object will
+# not write the output if the file already exists, and matches what will be
+# written.  This prevents the timestamp from changing to optimize cases where
+# the output files are used by a timestamp dependent build system
+#
+class IDLOutFile(object):
+  def __init__(self, filename, always_write = False, create_dir = True):
+    self.filename = filename
+    self.always_write = always_write
+    self.create_dir = create_dir
+    self.outlist = []
+    self.open = True
+
+  # Return the file name
+  def Filename(self):
+    return self.filename
+
+  # Append to the output if the file is still open
+  def Write(self, string):
+    if not self.open:
+      raise RuntimeError('Could not write to closed file %s.' % self.filename)
+    self.outlist.append(string)
+
+  # Close the file
+  def Close(self):
+    filename = os.path.realpath(self.filename)
+    self.open = False
+    outtext = ''.join(self.outlist)
+    if not self.always_write:
+      if os.path.isfile(filename):
+        intext = open(filename, 'rb').read()
+      else:
+        intext = ''
+
+      if IsEquivalent(intext, outtext):
+        if GetOption('verbose'):
+          InfoOut.Log('Output %s unchanged.' % self.filename)
+        return False
+
+    if GetOption('diff'):
+      for line in difflib.unified_diff(intext.split('\n'), outtext.split('\n'),
+                                       'OLD ' + self.filename,
+                                       'NEW ' + self.filename,
+                                       n=1, lineterm=''):
+        ErrOut.Log(line)
+
+    try:
+      # If the directory does not exit, try to create it, if we fail, we
+      # still get the exception when the file is openned.
+      basepath, leafname = os.path.split(filename)
+      if basepath and not os.path.isdir(basepath) and self.create_dir:
+        InfoOut.Log('Creating directory: %s\n' % basepath)
+        os.makedirs(basepath)
+
+      if not GetOption('test'):
+        outfile = open(filename, 'wb')
+        outfile.write(outtext)
+        InfoOut.Log('Output %s written.' % self.filename)
+      return True
+
+    except IOError as (errno, strerror):
+      ErrOut.Log("I/O error(%d): %s" % (errno, strerror))
+    except:
+      ErrOut.Log("Unexpected error: %s" % sys.exc_info()[0])
+      raise
+
+    return False
+
+
+def TestFile(name, stringlist, force, update):
+  errors = 0
+
+  # Get the old timestamp
+  if os.path.exists(name):
+    old_time = os.stat(filename)[ST_MTIME]
+  else:
+    old_time = 'NONE'
+
+  # Create the file and write to it
+  out = IDLOutFile(filename, force)
+  for item in stringlist:
+    out.Write(item)
+
+  # We wait for flush to force the timestamp to change
+  time.sleep(2)
+
+  wrote = out.Close()
+  cur_time = os.stat(filename)[ST_MTIME]
+  if update:
+    if not wrote:
+      ErrOut.Log('Failed to write output %s.' % filename)
+      return 1
+    if cur_time == old_time:
+      ErrOut.Log('Failed to update timestamp for %s.' % filename)
+      return 1
+  else:
+    if wrote:
+      ErrOut.Log('Should not have writen output %s.' % filename)
+      return 1
+    if cur_time != old_time:
+      ErrOut.Log('Should not have modified timestamp for %s.' % filename)
+      return 1
+  return 0
+
+
+def main():
+  errors = 0
+  stringlist = ['Test', 'Testing\n', 'Test']
+  filename = 'outtest.txt'
+
+  # Test forcibly writing a file
+  errors += TestFile(filename, stringlist, force=True, update=True)
+
+  # Test conditionally writing the file skipping
+  errors += TestFile(filename, stringlist, force=False, update=False)
+
+  # Test conditionally writing the file updating
+  errors += TestFile(filename, stringlist + ['X'], force=False, update=True)
+
+  # Clean up file
+  os.remove(filename)
+  if not errors: InfoOut.Log('All tests pass.')
+  return errors
+
+
+if __name__ == '__main__':
+  sys.exit(main())