ArcanistToStringExceptionXHPASTLinterRule.php
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ArcanistToStringExceptionXHPASTLinterRule.php
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	<?php

	final class ArcanistToStringExceptionXHPASTLinterRule
	extends ArcanistXHPASTLinterRule {

	const ID = 67;

	public function getLintName() {
	return pht('Throwing Exception in `%s` Method', '__toString');
	}

	public function process(XHPASTNode $root) {
	$methods = $root->selectDescendantsOfType('n_METHOD_DECLARATION');

	foreach ($methods as $method) {
	$name = $method
	->getChildOfType(2, 'n_STRING')
	->getConcreteString();

	if ($name != '__toString') {
	continue;
	}

	$statements = $method->getChildByIndex(6);

	if ($statements->getTypeName() != 'n_STATEMENT_LIST') {
	continue;
	}

	$throws = $statements->selectDescendantsOfType('n_THROW');

	foreach ($throws as $throw) {
	$this->raiseLintAtNode(
	$throw,
	pht(
	'It is not possible to throw an `%s` from within the `%s` method.',
	'Exception',
	'__toString'));
	}
	}
	}

	}