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https://github.com/darlinghq/darling-JavaScriptCore.git
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63 lines
2.4 KiB
Python
63 lines
2.4 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (c) 2015 Apple Inc. All rights reserved.
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# Copyright (c) 2009 Google Inc. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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# THE POSSIBILITY OF SUCH DAMAGE.
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# A writer that only updates file if it actually changed.
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import os
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class LazyFileWriter:
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def __init__(self, filepath, force_output):
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self._filepath = filepath
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self._output = ""
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self.force_output = force_output
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def write(self, text):
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self._output += text
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def close(self):
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text_changed = True
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self._output = self._output.rstrip() + "\n"
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try:
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if self.force_output:
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raise
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read_file = open(self._filepath, "r")
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old_text = read_file.read()
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read_file.close()
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text_changed = old_text != self._output
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except:
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# Ignore, just overwrite by default
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pass
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if text_changed or self.force_output:
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dirname = os.path.dirname(self._filepath)
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if not os.path.isdir(dirname):
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os.makedirs(dirname)
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out_file = open(self._filepath, "w")
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out_file.write(self._output)
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out_file.close()
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