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PhutilBugtraqParser.php
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Sat, May 25, 19:31

PhutilBugtraqParser.php
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<?php
/**
* Replaces ticket or issue IDs in a block of text with links. This mechanism
* is based on (and compatible with) the Bugtraq system in TortiseSVN. See
*
* http://tortoisesvn.net/docs/release/TortoiseSVN_en/tsvn-dug-bugtracker.html
*
* For example, to link ticket IDs formatted like this:
*
* Issues: 123, 345
*
* ...you can use:
*
* $message = id(new PhutilBugtraqParser())
* ->setBugtraqPattern('http://bugs.com/%BUGID%')
* ->setBugtraqCaptureExpression('/[Ii]ssues?:?(\s*,?\s*#\d+)+/')
* ->setBugtraqSelectExpression('/(\d+)/')
* ->processCorpus($message);
*
* This will produce:
*
* Issues: http://bugs.com/123, http://bugs.com/345
*
*/
final class PhutilBugtraqParser {
private $bugtraqPattern;
private $bugtraqCaptureExpression;
private $bugtraqSelectExpression;
public function setBugtraqPattern($pattern) {
$this->bugtraqPattern = $pattern;
return $this;
}
public function setBugtraqCaptureExpression($regex) {
PhutilTypeSpec::newFromString('regex')->check($regex);
$this->bugtraqCaptureExpression = $regex;
return $this;
}
public function setBugtraqSelectExpression($regex) {
PhutilTypeSpec::newFromString('regex')->check($regex);
$this->bugtraqSelectExpression = $regex;
return $this;
}
public function processCorpus($corpus) {
$regexp = $this->bugtraqCaptureExpression;
$matches = null;
$flags = PREG_SET_ORDER | PREG_OFFSET_CAPTURE;
// First, find all the matching text ranges. We do this up front because
// when we do the replacement pass at the end, the whole thing needs to go
// in reverse order.
preg_match_all($regexp, $corpus, $matches, $flags);
$captures = array();
foreach ($matches as $match) {
list($captured_text, $captured_offset) = $match[0];
$captures[] = array(
'text' => $captured_text,
'at' => $captured_offset,
);
}
// Find the actual bug IDs. If there's a selection expression, we use that
// to pick bug IDs out of a larger context. For example, the syntax may be:
//
// Issues: 123, 124
//
// In this case, "123" and "124" are the issue IDs, and could be selected
// with an expression like:
//
// /(\d+)/
//
// If there's no selection expression, we use the entire match.
$bug_ids = array();
$select_regexp = $this->bugtraqSelectExpression;
foreach ($captures as $capture) {
$captured_text = $capture['text'];
$captured_offset = $capture['at'];
if (strlen($select_regexp)) {
$selections = null;
preg_match_all(
$select_regexp,
$captured_text,
$selections,
PREG_OFFSET_CAPTURE);
foreach ($selections[1] as $selection) {
$bug_ids[] = array(
'text' => $selection[0],
'at' => $captured_offset + $selection[1],
);
}
} else {
$bug_ids[] = array(
'text' => $captured_text,
'at' => $captured_offset,
);
}
}
// Now that we have all the bug IDs to replace, replace them (in reverse
// order, so the offsets don't get messed up).
$bug_ids = array_reverse($bug_ids);
foreach ($bug_ids as $bug) {
$new_text = str_replace(
'%BUGID%',
$bug['text'],
$this->bugtraqPattern);
$corpus = substr_replace(
$corpus,
$new_text,
$bug['at'],
strlen($bug['text']));
}
return $corpus;
}
}

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