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<?php | |
function gfm($text){ | |
# Extract pre blocks | |
$extractions = array(); | |
$text = preg_replace_callback('/<pre>.*?<\/pre>/s', function($matches) use (&$extractions){ | |
$match = $matches[0]; | |
$md5 = md5($match); | |
$extractions[$md5] = $match; | |
return "{gfm-extraction-${md5}}"; | |
}, $text); | |
# prevent foo_bar_baz from ending up with an italic word in the middle | |
$text = preg_replace_callback('/(^(?! {4}|\t)\w+_\w+_\w[\w_]*)/s', function($matches){ | |
$x = $matches[0]; | |
$x_parts = str_split($x); | |
sort($x_parts); | |
if( substr(implode('', $x_parts), 0, 2) == '__' ){ | |
return str_replace('_', '\_', $x); | |
} | |
}, $text); | |
# in very clear cases, let newlines become <br /> tags | |
$text = preg_replace_callback('/^[\w\<][^\n]*\n+/m', function($matches){ | |
$x = $matches[0]; | |
if( !preg_match('/\n{2}/', $x) ){ | |
$x = trim($x); | |
$x .= " \n"; | |
} | |
return $x; | |
}, $text); | |
# Insert pre block extractions | |
$text = preg_replace_callback('/\{gfm-extraction-([0-9a-f]{32})\}/', function($matches) use (&$extractions){ | |
$match = $matches[1]; | |
return "\n\n" . $extractions[$match]; | |
}, $text); | |
return $text; | |
} |
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<?php | |
require 'gfm.php'; | |
class GFMTest extends PHPUnit_Framework_TestCase{ | |
public function testShouldNotTouchSingleUnderscoresInsideWords(){ | |
$this->assertEquals("foo_bar", gfm("foo_bar")); | |
} | |
public function testShouldNotTouchUnderscoresInCodeBlocks(){ | |
$this->assertEquals(" foo_bar_baz", gfm(" foo_bar_baz")); | |
} | |
public function testShouldNotTouchUnderscoresInPreBlocks(){ | |
$this->assertEquals("\n\n<pre>\nfoo_bar_baz\n</pre>", gfm("<pre>\nfoo_bar_baz\n</pre>")); | |
} | |
public function testShouldNotTreatPreBlocksWithPreTextDifferently(){ | |
$a = "\n\n<pre>\nthis is `a\\_test` and this\\_too\n</pre>"; | |
$b = "hmm<pre>\nthis is `a\\_test` and this\\_too\n</pre>"; | |
$this->assertEquals( substr(gfm($a), 2), substr(gfm($b), 3) ); | |
} | |
public function testShouldEscapeTwoOrMoreUnderscoresInsideWords(){ | |
$this->assertEquals( "foo\\_bar\\_baz", gfm("foo_bar_baz") ); | |
} | |
public function testShouldTurnNewlinesIntoBrTagsInSimpleCases(){ | |
$this->assertEquals( "foo \nbar", gfm("foo\nbar") ); | |
} | |
public function testShouldConvertNewlinesInAllGroups(){ | |
$this->assertEquals( "apple \npear \norange\n\nruby \npython \nerlang", | |
gfm("apple\npear\norange\n\nruby\npython\nerlang") ); | |
} | |
public function testShouldConvertNewlinesInEvenLongGroups(){ | |
$this->assertEquals( "apple \npear \norange \nbanana\n\nruby \npython \nerlang", | |
gfm("apple\npear\norange\nbanana\n\nruby\npython\nerlang") ); | |
} | |
public function testShouldNotConvertNewlinesInLists(){ | |
$this->assertEquals( "# foo\n# bar", gfm("# foo\n# bar") ); | |
$this->assertEquals( "* foo\n* bar", gfm("* foo\n* bar") ); | |
} | |
} |
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