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#!/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 IsEquivelent(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 IsEquivelent(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())
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