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42 lines
2.9 KiB
Markdown
42 lines
2.9 KiB
Markdown
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The Diff Match and Patch libraries offer robust algorithms to perform the
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operations required for synchronizing plain text.
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1. Diff:
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* Compare two blocks of plain text and efficiently return a list of differences.
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* [Diff Demo](https://neil.fraser.name/software/diff_match_patch/demos/diff.html)
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2. Match:
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* Given a search string, find its best fuzzy match in a block of plain text. Weighted for both accuracy and location.
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* [Match Demo](https://neil.fraser.name/software/diff_match_patch/demos/match.html)
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3. Patch:
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* Apply a list of patches onto plain text. Use best-effort to apply patch even when the underlying text doesn't match.
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* [Patch Demo](https://neil.fraser.name/software/diff_match_patch/demos/patch.html)
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Originally built in 2006 to power Google Docs, this library is now available in C++, C#, Dart, Java, JavaScript, Lua, Objective C, and Python.
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### Reference
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* [API](https://github.com/google/diff-match-patch/wiki/API) - Common API across all languages.
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* [Line or Word Diffs](https://github.com/google/diff-match-patch/wiki/Line-or-Word-Diffs) - Less detailed diffs.
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* [Plain Text vs. Structured Content](https://github.com/google/diff-match-patch/wiki/Plain-Text-vs.-Structured-Content) - How to deal with data like XML.
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* [Unidiff](https://github.com/google/diff-match-patch/wiki/Unidiff) - The patch serialization format.
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* [Support](https://groups.google.com/forum/#!forum/diff-match-patch) - Newsgroup for developers.
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### Languages
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Although each language port of Diff Match Patch uses the same API, there are some language-specific notes.
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* [C++](https://github.com/google/diff-match-patch/wiki/Language:-Cpp)
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* [C#](https://github.com/google/diff-match-patch/wiki/Language:-C%23)
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* [Dart](https://github.com/google/diff-match-patch/wiki/Language:-Dart)
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* [Java](https://github.com/google/diff-match-patch/wiki/Language:-Java)
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* [JavaScript](https://github.com/google/diff-match-patch/wiki/Language:-JavaScript)
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* [Lua](https://github.com/google/diff-match-patch/wiki/Language:-Lua)
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* [Objective-C](https://github.com/google/diff-match-patch/wiki/Language:-Objective-C)
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* [Python](https://github.com/google/diff-match-patch/wiki/Language:-Python)
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A standardized speed test tracks the [relative performance of diffs](https://docs.google.com/spreadsheets/d/1zpZccuBpjMZTvL1nGDMKJc7rWL_m_drF4XKOJvB27Kc/edit#gid=0) in each language.
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### Algorithms
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This library implements [Myer's diff algorithm](https://neil.fraser.name/writing/diff/myers.pdf) which is generally considered to be the best general-purpose diff. A layer of [pre-diff speedups and post-diff cleanups](https://neil.fraser.name/writing/diff/) surround the diff algorithm, improving both performance and output quality.
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This library also implements a [Bitap matching algorithm](https://neil.fraser.name/writing/patch/bitap.ps) at the heart of a [flexible matching and patching strategy](https://neil.fraser.name/writing/patch/).
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