| Index: third_party/WebKit/Tools/Scripts/webkitpy/common/html_diff.py
|
| diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/html_diff.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/html_diff.py
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..56000331a30f5b48371ea12bf125b26ee06aa709
|
| --- /dev/null
|
| +++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/html_diff.py
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| @@ -0,0 +1,64 @@
|
| +# Copyright 2016 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.
|
| +
|
| +"""Utility for outputting a HTML diff of two multi-line strings.
|
| +
|
| +The main purpose of this utility is to show the difference between
|
| +text baselines (-expected.txt files) and actual text results.
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| +
|
| +Note, in the standard library module difflib, there is also a HtmlDiff class,
|
| +although it outputs a larger and more complex HTML table than we need.
|
| +"""
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| +
|
| +import difflib
|
| +
|
| +_TEMPLATE = """<html>
|
| +<head>
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| +<style>.del { background: #faa; } .add { background: #afa; }</style>
|
| +</head>
|
| +<body>
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| +<pre>%s</pre>
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| +</body>
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| +</html>
|
| +"""
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| +
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| +
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| +def html_diff(a_text, b_text):
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| + """Returns a diff between two strings as HTML."""
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| + # Diffs can be between multiple text files of different encodings
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| + # so we always want to deal with them as byte arrays, not unicode strings.
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| + assert isinstance(a_text, str)
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| + assert isinstance(b_text, str)
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| + a_lines = a_text.splitlines(True)
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| + b_lines = b_text.splitlines(True)
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| + return _TEMPLATE % html_diff_body(a_lines, b_lines)
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| +
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| +
|
| +def html_diff_body(a_lines, b_lines):
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| + matcher = difflib.SequenceMatcher(None, a_lines, b_lines)
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| + output = []
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| + for tag, a_start, a_end, b_start, b_end in matcher.get_opcodes():
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| + a_chunk = ''.join(a_lines[a_start:a_end])
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| + b_chunk = ''.join(b_lines[b_start:b_end])
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| + output.append(_format_chunk(tag, a_chunk, b_chunk))
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| + return ''.join(output)
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| +
|
| +
|
| +def _format_chunk(tag, a_chunk, b_chunk):
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| + if tag == 'delete':
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| + return _format_delete(a_chunk)
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| + if tag == 'insert':
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| + return _format_insert(b_chunk)
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| + if tag == 'replace':
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| + return _format_delete(a_chunk) + _format_insert(b_chunk)
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| + assert tag == 'equal'
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| + return a_chunk
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| +
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| +
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| +def _format_insert(chunk):
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| + return '<span class="add">%s</span>' % chunk
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| +
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| +
|
| +def _format_delete(chunk):
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| + return '<span class="del">%s</span>' % chunk
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|
|
Chromium Code Reviews
Issue 2580143002:
Add Python html_diff module. (Closed)
