ArcanistStaticThisXHPASTLinterRule.php
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ArcanistStaticThisXHPASTLinterRule.php
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	<?php

	final class ArcanistStaticThisXHPASTLinterRule
	extends ArcanistXHPASTLinterRule {

	const ID = 13;

	public function getLintName() {
	return pht('Use of %s in Static Context', '$this');
	}

	public function process(XHPASTNode $root) {
	$classes = $root->selectDescendantsOfType('n_CLASS_DECLARATION');

	foreach ($classes as $class) {
	$methods = $class->selectDescendantsOfType('n_METHOD_DECLARATION');

	foreach ($methods as $method) {
	$attributes = $method
	->getChildByIndex(0, 'n_METHOD_MODIFIER_LIST')
	->selectDescendantsOfType('n_STRING');

	$method_is_static = false;
	$method_is_abstract = false;

	foreach ($attributes as $attribute) {
	if (strtolower($attribute->getConcreteString()) === 'static') {
	$method_is_static = true;
	}
	if (strtolower($attribute->getConcreteString()) === 'abstract') {
	$method_is_abstract = true;
	}
	}

	if ($method_is_abstract) {
	continue;
	}

	if (!$method_is_static) {
	continue;
	}

	$body = $method->getChildOfType(5, 'n_STATEMENT_LIST');
	$variables = $body->selectDescendantsOfType('n_VARIABLE');

	foreach ($variables as $variable) {
	if ($method_is_static &&
	strtolower($variable->getConcreteString()) === '$this') {
	$this->raiseLintAtNode(
	$variable,
	pht(
	'You can not reference `%s` inside a static method.',
	'$this'));
	}
	}
	}
	}
	}

	}