ArcanistInvalidDefaultParameterXHPASTLinterRule.php
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ArcanistInvalidDefaultParameterXHPASTLinterRule.php
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	<?php

	final class ArcanistInvalidDefaultParameterXHPASTLinterRule
	extends ArcanistXHPASTLinterRule {

	const ID = 70;

	public function getLintName() {
	return pht('Invalid Default Parameter');
	}

	public function process(XHPASTNode $root) {
	$parameters = $root->selectDescendantsOfType('n_DECLARATION_PARAMETER');

	foreach ($parameters as $parameter) {
	$type = $parameter->getChildByIndex(0);
	$default = $parameter->getChildByIndex(2);

	if ($type->getTypeName() == 'n_EMPTY') {
	continue;
	}

	if ($default->getTypeName() == 'n_EMPTY') {
	continue;
	}

	$default_is_null = $default->getTypeName() == 'n_SYMBOL_NAME' &&
	strtolower($default->getConcreteString()) == 'null';

	switch (strtolower($type->getConcreteString())) {
	case 'array':
	if ($default->getTypeName() == 'n_ARRAY_LITERAL') {
	break;
	}
	if ($default_is_null) {
	break;
	}

	$this->raiseLintAtNode(
	$default,
	pht(
	'Default value for parameters with `%s` type hint '.
	'can only be an `%s` or `%s`.',
	'array',
	'array',
	'null'));
	break;

	case 'callable':
	if ($default_is_null) {
	break;
	}

	$this->raiseLintAtNode(
	$default,
	pht(
	'Default value for parameters with `%s` type hint '.
	'can only be `%s`.',
	'callable',
	'null'));
	break;

	default:
	// Class/interface parameter.
	if ($default_is_null) {
	break;
	}

	$this->raiseLintAtNode(
	$default,
	pht(
	'Default value for parameters with a class type hint '.
	'can only be `%s`.',
	'null'));
	break;
	}
	}
	}

	}

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