WebKit/Source/JavaScriptCore/Scripts/lazywriter.py at main · WebKit/WebKit · GitHub

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#!/usr/bin/env python3

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

# 1. Redistributions of source code must retain the above copyright

# notice, this list of conditions and the following disclaimer.

# 2. Redistributions in binary form must reproduce the above copyright

# notice, this list of conditions and the following disclaimer in the

# documentation and/or other materials provided with the distribution.

# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''

# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS

# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

# THE POSSIBILITY OF SUCH DAMAGE.

# A writer that only updates file if it actually changed.

import os

class LazyFileWriter:

def __init__(self, filepath, force_output):

self._filepath = filepath

self._output = ""

self.force_output = force_output

def write(self, text):

self._output += text

def close(self):

text_changed = True

self._output = self._output.rstrip() + "\n"

try:

if self.force_output:

raise

read_file = open(self._filepath, "r")

old_text = read_file.read()

read_file.close()

text_changed = old_text != self._output

except:

# Ignore, just overwrite by default

pass

if text_changed or self.force_output:

dirname = os.path.dirname(self._filepath)

if not os.path.isdir(dirname):

os.makedirs(dirname)

out_file = open(self._filepath, "w")

out_file.write(self._output)

out_file.close()

WebKit/Source/JavaScriptCore/Scripts/lazywriter.py at main · WebKit/WebKit · GitHub

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