ArcanistCSSLintLinter.php
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	<?php

	/**
	* Uses "CSS Lint" to detect checkstyle errors in CSS code.
	*/
	final class ArcanistCSSLintLinter extends ArcanistExternalLinter {

	public function getInfoName() {
	return 'CSSLint';
	}

	public function getInfoURI() {
	return 'http://csslint.net';
	}

	public function getInfoDescription() {
	return pht(
	'Use `%s` to detect issues with CSS source files.',
	'csslint');
	}

	public function getLinterName() {
	return 'CSSLint';
	}

	public function getLinterConfigurationName() {
	return 'csslint';
	}

	protected function getMandatoryFlags() {
	return array(
	'--format=lint-xml',
	);
	}

	public function getDefaultBinary() {
	return 'csslint';
	}

	public function getVersion() {
	list($stdout) = execx('%C --version', $this->getExecutableCommand());

	$matches = array();
	if (preg_match('/^v(?P<version>\d+\.\d+\.\d+)$/', $stdout, $matches)) {
	return $matches['version'];
	} else {
	return false;
	}
	}

	public function getInstallInstructions() {
	return pht(
	'Install %s using `%s`.', 'CSSLint',
	'npm install -g csslint');
	}

	protected function parseLinterOutput($path, $err, $stdout, $stderr) {
	$report_dom = new DOMDocument();
	$ok = @$report_dom->loadXML($stdout);

	if (!$ok) {
	return false;
	}

	$files = $report_dom->getElementsByTagName('file');
	$messages = array();

	foreach ($files as $file) {
	foreach ($file->childNodes as $child) {
	$line = $child->getAttribute('line');
	$char = $child->getAttribute('char');
	$original_text = $child->getAttribute('evidence');

	if ($line === '') {
	$line = null;
	}

	if ($char === '') {
	$char = null;
	} else {
	$original_text = substr($original_text, $char - 1);
	}

	$message = id(new ArcanistLintMessage())
	->setPath($path)
	->setLine($line)
	->setChar($char)
	->setCode($this->getLinterName())
	->setName($this->getLinterName())
	->setDescription($child->getAttribute('reason'))
	->setOriginalText($original_text);

	switch ($child->getAttribute('severity')) {
	case 'error':
	$message->setSeverity(ArcanistLintSeverity::SEVERITY_ERROR);
	break;

	case 'warning':
	$message->setSeverity(ArcanistLintSeverity::SEVERITY_WARNING);
	break;

	default:
	$message->setSeverity(ArcanistLintSeverity::SEVERITY_ERROR);
	break;
	}

	$messages[] = $message;
	}
	}

	return $messages;
	}

	protected function getLintCodeFromLinterConfigurationKey($code) {
	// NOTE: We can't figure out which rule generated each message, so we
	// can not customize severities. I opened a pull request to add this
	// ability; see:
	//
	// https://github.com/stubbornella/csslint/pull/409
	throw new Exception(
	pht(
	"%s does not currently support custom severity levels, because ".
	"rules can't be identified from messages in output.",
	'CSSLint'));
	}

	}

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