Diff implementation for PHP, factored out of PHPUnit into a stand-alone component.
Installation
You can add this library as a local, per-project dependency to your project using Composer:
composer require sebastian/diff
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:
composer require --dev sebastian/diff
Usage
Generating diff
The Differ class can be used to generate a textual representation of the difference between two strings:
diff('foo', 'bar');
The code above yields the output below:
--- Original
+++ New
@@ @@
-foo
+bar
The `UnifiedDiffOutputBuilder` used in the example above generates output in "unified diff" format and is used by PHPUnit, for example.
The `StrictUnifiedDiffOutputBuilder` generates output in "strict unified diff" format with hunks, similar to `diff -u` and compatible with `patch` or `git apply`.
The `DiffOnlyOutputBuilder` generates output that only contains the lines that differ.
If none of these three output builders match your use case then you can implement`DiffOutputBuilderInterface` to generate custom output.
#### Parsing diff
[](#parsing-diff)
The `Parser` class can be used to parse a unified diff into an object graph:
use SebastianBergmann\Diff\Parser;
use SebastianBergmann\Git;
$git = new Git('/usr/local/src/money');
diff=diff = diff=git->getDiff(
'948a1a07768d8edd10dcefa8315c1cbeffb31833',
'c07a373d2399f3e686234c4f7f088d635eb9641b'
);
$parser = new Parser;
print_r($parser->parse($diff));
The code above yields the output below:
```
Array
(
[0] => SebastianBergmann\Diff\Diff Object
(
[from:SebastianBergmann\Diff\Diff:private] => a/tests/MoneyTest.php
[to:SebastianBergmann\Diff\Diff:private] => b/tests/MoneyTest.php
[chunks:SebastianBergmann\Diff\Diff:private] => Array
(
[0] => SebastianBergmann\Diff\Chunk Object
(
[start:SebastianBergmann\Diff\Chunk:private] => 87
[startRange:SebastianBergmann\Diff\Chunk:private] => 7
[end:SebastianBergmann\Diff\Chunk:private] => 87
[endRange:SebastianBergmann\Diff\Chunk:private] => 7
[lines:SebastianBergmann\Diff\Chunk:private] => Array
(
[0] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 3
[content:SebastianBergmann\Diff\Line:private] => * @covers SebastianBergmann\Money\Money::add
)
[1] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 3
[content:SebastianBergmann\Diff\Line:private] => * @covers SebastianBergmann\Money\Money::newMoney
)
[2] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 3
[content:SebastianBergmann\Diff\Line:private] => */
)
[3] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 2
[content:SebastianBergmann\Diff\Line:private] => public function testAnotherMoneyWithSameCurrencyObjectCanBeAdded()
)
[4] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 1
[content:SebastianBergmann\Diff\Line:private] => public function testAnotherMoneyObjectWithSameCurrencyCanBeAdded()
)
[5] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 3
[content:SebastianBergmann\Diff\Line:private] => {
)
[6] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 3
[content:SebastianBergmann\Diff\Line:private] => $a = new Money(1, new Currency('EUR'));
)
[7] => SebastianBergmann\Diff\Line Object
(
[type:SebastianBergmann\Diff\Line:private] => 3
[content:SebastianBergmann\Diff\Line:private] => $b = new Money(2, new Currency('EUR'));
)
)
)
)
)
)
```
Note: If the chunk size is 0 lines, i.e., `getStartRange()` or `getEndRange()` return 0, the number of line returned by `getStart()` or `getEnd()` is one lower than one would expect. It is the line number after which the chunk should be inserted or deleted; in all other cases, it gives the first line number of the replaced range of lines.
