ArcanistPyFlakesLinter.php
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ArcanistPyFlakesLinter.php
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	<?php

	/**
	* Uses "PyFlakes" to detect various errors in Python code.
	*/
	final class ArcanistPyFlakesLinter extends ArcanistExternalLinter {

	public function getInfoURI() {
	return 'https://pypi.python.org/pypi/pyflakes';
	}

	public function getInfoName() {
	return pht('PyFlakes');
	}

	public function getInfoDescription() {
	return pht(
	'PyFlakes is a simple program which checks Python source files for '.
	'errors.');
	}

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

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

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

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

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

	public function getInstallInstructions() {
	return pht('Install pyflakes with `%s`.', 'pip install pyflakes');
	}

	protected function parseLinterOutput($path, $err, $stdout, $stderr) {
	$lines = phutil_split_lines($stdout, false);

	$messages = array();
	foreach ($lines as $line) {
	$matches = null;
	if (!preg_match('/^(.?):(\d+): (.)$/', $line, $matches)) {
	continue;
	}
	foreach ($matches as $key => $match) {
	$matches[$key] = trim($match);
	}

	$severity = ArcanistLintSeverity::SEVERITY_WARNING;
	$description = $matches[3];

	$error_regexp = '/(^undefined\|^duplicate\|before assignment$)/';
	if (preg_match($error_regexp, $description)) {
	$severity = ArcanistLintSeverity::SEVERITY_ERROR;
	}

	$message = new ArcanistLintMessage();
	$message->setPath($path);
	$message->setLine($matches[2]);
	$message->setCode($this->getLinterName());
	$message->setDescription($description);
	$message->setSeverity($severity);

	$messages[] = $message;
	}

	return $messages;
	}

	protected function canCustomizeLintSeverities() {
	return false;
	}

	}

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