203 lines
7.5 KiB
Markdown
203 lines
7.5 KiB
Markdown
# sebastian/diff
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[](https://github.com/sebastianbergmann/diff/actions)
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[](https://shepherd.dev/github/sebastianbergmann/diff)
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Diff implementation for PHP, factored out of PHPUnit into a stand-alone component.
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## Installation
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You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
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```
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composer require sebastian/diff
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```
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If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:
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```
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composer require --dev sebastian/diff
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```
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### Usage
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#### Generating diff
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The `Differ` class can be used to generate a textual representation of the difference between two strings:
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```php
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<?php
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use SebastianBergmann\Diff\Differ;
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$differ = new Differ;
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print $differ->diff('foo', 'bar');
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```
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The code above yields the output below:
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```diff
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--- Original
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+++ New
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@@ @@
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-foo
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+bar
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```
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There are three output builders available in this package:
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#### UnifiedDiffOutputBuilder
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This is default builder, which generates the output close to udiff and is used by PHPUnit.
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```php
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<?php
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use SebastianBergmann\Diff\Differ;
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use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;
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$builder = new UnifiedDiffOutputBuilder(
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"--- Original\n+++ New\n", // custom header
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false // do not add line numbers to the diff
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);
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$differ = new Differ($builder);
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print $differ->diff('foo', 'bar');
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```
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#### StrictUnifiedDiffOutputBuilder
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Generates (strict) Unified diff's (unidiffs) with hunks,
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similar to `diff -u` and compatible with `patch` and `git apply`.
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```php
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<?php
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use SebastianBergmann\Diff\Differ;
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use SebastianBergmann\Diff\Output\StrictUnifiedDiffOutputBuilder;
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$builder = new StrictUnifiedDiffOutputBuilder([
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'collapseRanges' => true, // ranges of length one are rendered with the trailing `,1`
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'commonLineThreshold' => 6, // number of same lines before ending a new hunk and creating a new one (if needed)
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'contextLines' => 3, // like `diff: -u, -U NUM, --unified[=NUM]`, for patch/git apply compatibility best to keep at least @ 3
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'fromFile' => null,
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'fromFileDate' => null,
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'toFile' => null,
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'toFileDate' => null,
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]);
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$differ = new Differ($builder);
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print $differ->diff('foo', 'bar');
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```
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#### DiffOnlyOutputBuilder
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Output only the lines that differ.
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```php
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<?php
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use SebastianBergmann\Diff\Differ;
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use SebastianBergmann\Diff\Output\DiffOnlyOutputBuilder;
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$builder = new DiffOnlyOutputBuilder(
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"--- Original\n+++ New\n"
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);
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$differ = new Differ($builder);
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print $differ->diff('foo', 'bar');
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```
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#### DiffOutputBuilderInterface
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You can pass any output builder to the `Differ` class as longs as it implements the `DiffOutputBuilderInterface`.
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#### Parsing diff
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The `Parser` class can be used to parse a unified diff into an object graph:
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```php
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use SebastianBergmann\Diff\Parser;
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use SebastianBergmann\Git;
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$git = new Git('/usr/local/src/money');
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$diff = $git->getDiff(
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'948a1a07768d8edd10dcefa8315c1cbeffb31833',
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'c07a373d2399f3e686234c4f7f088d635eb9641b'
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);
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$parser = new Parser;
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print_r($parser->parse($diff));
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```
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The code above yields the output below:
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Array
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(
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[0] => SebastianBergmann\Diff\Diff Object
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(
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[from:SebastianBergmann\Diff\Diff:private] => a/tests/MoneyTest.php
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[to:SebastianBergmann\Diff\Diff:private] => b/tests/MoneyTest.php
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[chunks:SebastianBergmann\Diff\Diff:private] => Array
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(
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[0] => SebastianBergmann\Diff\Chunk Object
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(
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[start:SebastianBergmann\Diff\Chunk:private] => 87
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[startRange:SebastianBergmann\Diff\Chunk:private] => 7
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[end:SebastianBergmann\Diff\Chunk:private] => 87
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[endRange:SebastianBergmann\Diff\Chunk:private] => 7
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[lines:SebastianBergmann\Diff\Chunk:private] => Array
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(
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[0] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 3
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[content:SebastianBergmann\Diff\Line:private] => * @covers SebastianBergmann\Money\Money::add
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)
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[1] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 3
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[content:SebastianBergmann\Diff\Line:private] => * @covers SebastianBergmann\Money\Money::newMoney
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)
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[2] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 3
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[content:SebastianBergmann\Diff\Line:private] => */
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)
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[3] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 2
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[content:SebastianBergmann\Diff\Line:private] => public function testAnotherMoneyWithSameCurrencyObjectCanBeAdded()
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)
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[4] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 1
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[content:SebastianBergmann\Diff\Line:private] => public function testAnotherMoneyObjectWithSameCurrencyCanBeAdded()
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)
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[5] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 3
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[content:SebastianBergmann\Diff\Line:private] => {
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)
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[6] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 3
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[content:SebastianBergmann\Diff\Line:private] => $a = new Money(1, new Currency('EUR'));
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)
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[7] => SebastianBergmann\Diff\Line Object
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(
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[type:SebastianBergmann\Diff\Line:private] => 3
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[content:SebastianBergmann\Diff\Line:private] => $b = new Money(2, new Currency('EUR'));
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)
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)
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)
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)
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)
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)
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