mirror of
https://github.com/danog/psalm.git
synced 2024-12-13 17:57:37 +01:00
788 lines
28 KiB
PHP
788 lines
28 KiB
PHP
<?php
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namespace Psalm\Checker;
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use PhpParser;
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use Psalm\Checker\Statements\Block\ForChecker;
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use Psalm\Checker\Statements\Block\ForeachChecker;
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use Psalm\Checker\Statements\Block\IfChecker;
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use Psalm\Checker\Statements\Block\SwitchChecker;
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use Psalm\Checker\Statements\Block\TryChecker;
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use Psalm\Checker\Statements\Block\WhileChecker;
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use Psalm\Checker\Statements\ExpressionChecker;
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use Psalm\Checker\Statements\Expression\AssignmentChecker;
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use Psalm\Checker\Statements\Expression\CallChecker;
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use Psalm\CodeLocation;
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use Psalm\Config;
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use Psalm\Context;
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use Psalm\Exception\FileIncludeException;
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use Psalm\Issue\ContinueOutsideLoop;
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use Psalm\Issue\InvalidGlobal;
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use Psalm\Issue\InvalidNamespace;
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use Psalm\Issue\UnevaluatedCode;
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use Psalm\Issue\UnrecognizedStatement;
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use Psalm\IssueBuffer;
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use Psalm\StatementsSource;
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use Psalm\Type;
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class StatementsChecker extends SourceChecker implements StatementsSource
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{
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/**
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* @var StatementsSource
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*/
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protected $source;
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/**
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* @var array<string, CodeLocation>
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*/
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private $all_vars = [];
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/**
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* @var array<string, array<string, Type\Union>>
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*/
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public static $user_constants = [];
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/**
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* @param StatementsSource $source
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*/
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public function __construct(StatementsSource $source)
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{
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$this->source = $source;
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}
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/**
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* Checks an array of statements for validity
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*
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* @param array<PhpParser\Node\Stmt|PhpParser\Node\Expr> $stmts
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* @param Context $context
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* @param Context|null $loop_context
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* @param Context|null $global_context
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* @return null|false
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*/
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public function analyze(
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array $stmts,
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Context $context,
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Context $loop_context = null,
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Context $global_context = null
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) {
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$has_returned = false;
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$function_checkers = [];
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// hoist functions to the top
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foreach ($stmts as $stmt) {
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if ($stmt instanceof PhpParser\Node\Stmt\Function_) {
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$function_checker = new FunctionChecker($stmt, $this->source);
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$function_checkers[$stmt->name] = $function_checker;
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}
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}
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foreach ($stmts as $stmt) {
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$plugins = Config::getInstance()->getPlugins();
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if ($plugins) {
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$code_location = new CodeLocation($this->source, $stmt);
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foreach ($plugins as $plugin) {
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if ($plugin->checkStatement(
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$this,
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$stmt,
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$context,
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$code_location,
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$this->getSuppressedIssues()
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) === false) {
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return false;
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}
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}
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}
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if ($has_returned && !($stmt instanceof PhpParser\Node\Stmt\Nop) &&
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!($stmt instanceof PhpParser\Node\Stmt\InlineHTML)
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) {
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if ($context->collect_references) {
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if (IssueBuffer::accepts(
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new UnevaluatedCode(
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'Expressions after return/throw/continue',
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new CodeLocation($this->source, $stmt)
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),
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$this->source->getSuppressedIssues()
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)) {
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return false;
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}
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}
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break;
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}
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/*
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if (isset($context->vars_in_scope['$storage'])) {
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var_dump($stmt->getLine() . ' ' . $context->vars_in_scope['$storage'], $context->referenced_vars);
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}
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*/
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if ($stmt instanceof PhpParser\Node\Stmt\If_) {
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IfChecker::analyze($this, $stmt, $context, $loop_context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\TryCatch) {
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TryChecker::analyze($this, $stmt, $context, $loop_context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\For_) {
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ForChecker::analyze($this, $stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Foreach_) {
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ForeachChecker::analyze($this, $stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\While_) {
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WhileChecker::analyze($this, $stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Do_) {
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$this->analyzeDo($stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Const_) {
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$this->analyzeConstAssignment($stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Unset_) {
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foreach ($stmt->vars as $var) {
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ExpressionChecker::analyze($this, $var, $context);
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$var_id = ExpressionChecker::getArrayVarId(
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$var,
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$this->getFQCLN(),
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$this
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);
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if ($var_id) {
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$context->remove($var_id);
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}
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}
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Return_) {
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$has_returned = true;
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$this->analyzeReturn($stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Throw_) {
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$has_returned = true;
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$this->analyzeThrow($stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Switch_) {
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SwitchChecker::analyze($this, $stmt, $context, $loop_context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Break_) {
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// do nothing
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Continue_) {
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if ($loop_context === null) {
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if (IssueBuffer::accepts(
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new ContinueOutsideLoop(
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'Continue call outside loop context',
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new CodeLocation($this->source, $stmt)
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),
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$this->source->getSuppressedIssues()
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)) {
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return false;
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}
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}
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$has_returned = true;
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Static_) {
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$this->analyzeStatic($stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Echo_) {
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foreach ($stmt->exprs as $i => $expr) {
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ExpressionChecker::analyze($this, $expr, $context);
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if (isset($expr->inferredType)) {
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if (CallChecker::checkFunctionArgumentType(
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$this,
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$expr->inferredType,
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Type::getString(),
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'echo',
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(int)$i,
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new CodeLocation($this->getSource(), $expr)
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) === false) {
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return false;
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}
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}
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}
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Function_) {
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$function_context = new Context($context->self);
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$function_context->collect_references = $this->getFileChecker()->project_checker->collect_references;
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$function_checkers[$stmt->name]->analyze($function_context, $context);
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$config = Config::getInstance();
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if (!$config->excludeIssueInFile('InvalidReturnType', $this->getFilePath())) {
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/** @var string */
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$method_id = $function_checkers[$stmt->name]->getMethodId();
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$function_storage = FunctionChecker::getStorage($method_id, $this->getFilePath());
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$return_type = $function_storage->return_type;
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$return_type_location = $function_storage->return_type_location;
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$function_checkers[$stmt->name]->verifyReturnType(
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false,
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$return_type,
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$this->getFQCLN(),
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$return_type_location
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);
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}
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} elseif ($stmt instanceof PhpParser\Node\Expr) {
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ExpressionChecker::analyze($this, $stmt, $context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\InlineHTML) {
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// do nothing
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Global_) {
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if (!$context->collect_initializations && !$global_context) {
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if (IssueBuffer::accepts(
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new InvalidGlobal(
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'Cannot use global scope here',
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new CodeLocation($this->source, $stmt)
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),
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$this->source->getSuppressedIssues()
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)) {
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// fall through
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}
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}
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foreach ($stmt->vars as $var) {
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if ($var instanceof PhpParser\Node\Expr\Variable) {
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if (is_string($var->name)) {
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$var_id = '$' . $var->name;
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$context->vars_in_scope[$var_id] =
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$global_context && $global_context->hasVariable($var_id)
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? clone $global_context->vars_in_scope[$var_id]
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: Type::getMixed();
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$context->vars_possibly_in_scope[$var_id] = true;
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} else {
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ExpressionChecker::analyze($this, $var, $context);
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}
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}
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}
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Property) {
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foreach ($stmt->props as $prop) {
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if ($prop->default) {
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ExpressionChecker::analyze($this, $prop->default, $context);
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if (isset($prop->default->inferredType)) {
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if (!$stmt->isStatic()) {
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if (AssignmentChecker::analyzePropertyAssignment(
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$this,
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$prop,
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$prop->name,
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$prop->default,
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$prop->default->inferredType,
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$context
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) === false) {
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// fall through
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}
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}
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}
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}
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}
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} elseif ($stmt instanceof PhpParser\Node\Stmt\ClassConst) {
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$const_visibility = \ReflectionProperty::IS_PUBLIC;
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if ($stmt->isProtected()) {
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$const_visibility = \ReflectionProperty::IS_PROTECTED;
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}
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if ($stmt->isPrivate()) {
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$const_visibility = \ReflectionProperty::IS_PRIVATE;
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}
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foreach ($stmt->consts as $const) {
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ExpressionChecker::analyze($this, $const->value, $context);
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if (isset($const->value->inferredType) && !$const->value->inferredType->isMixed()) {
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ClassLikeChecker::setConstantType(
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(string)$this->getFQCLN(),
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$const->name,
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$const->value->inferredType,
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$const_visibility
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);
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}
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}
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Class_) {
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$class_checker = (new ClassChecker($stmt, $this->source, $stmt->name));
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$class_checker->visit();
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$class_checker->analyze(null, $global_context);
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Nop) {
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if ((string)$stmt->getDocComment()) {
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CommentChecker::getTypeFromComment(
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(string)$stmt->getDocComment(),
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$context,
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$this->getSource()
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);
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}
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Goto_) {
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// do nothing
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Label) {
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// do nothing
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} elseif ($stmt instanceof PhpParser\Node\Stmt\Declare_) {
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// do nothing
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} else {
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if (IssueBuffer::accepts(
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new UnrecognizedStatement(
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'Psalm does not understand ' . get_class($stmt),
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new CodeLocation($this->source, $stmt)
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),
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$this->getSuppressedIssues()
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)) {
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return false;
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}
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}
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}
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return null;
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}
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/**
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* @param PhpParser\Node\Stmt\Static_ $stmt
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* @param Context $context
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* @return false|null
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*/
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private function analyzeStatic(PhpParser\Node\Stmt\Static_ $stmt, Context $context)
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{
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foreach ($stmt->vars as $var) {
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if ($var->default) {
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if (ExpressionChecker::analyze($this, $var->default, $context) === false) {
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return false;
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}
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}
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if ($context->check_variables) {
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$context->vars_in_scope['$' . $var->name] = $var->default && isset($var->default->inferredType)
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? $var->default->inferredType
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: Type::getMixed();
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$context->vars_possibly_in_scope['$' . $var->name] = true;
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$this->registerVariable('$' . $var->name, new CodeLocation($this, $stmt));
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}
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}
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return null;
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}
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/**
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* @param PhpParser\Node\Expr $stmt
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* @return Type\Union|null
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*/
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public static function getSimpleType(PhpParser\Node\Expr $stmt)
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{
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if ($stmt instanceof PhpParser\Node\Expr\ConstFetch) {
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if (strtolower($stmt->name->parts[0]) === 'false') {
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return Type::getFalse();
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} elseif (strtolower($stmt->name->parts[0]) === 'true') {
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return Type::getBool();
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} elseif (strtolower($stmt->name->parts[0]) === 'null') {
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return Type::getNull();
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}
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} elseif ($stmt instanceof PhpParser\Node\Expr\ClassConstFetch) {
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// @todo support this as well
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} elseif ($stmt instanceof PhpParser\Node\Scalar\String_) {
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return Type::getString();
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} elseif ($stmt instanceof PhpParser\Node\Scalar\LNumber) {
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return Type::getInt();
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} elseif ($stmt instanceof PhpParser\Node\Scalar\DNumber) {
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return Type::getFloat();
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} elseif ($stmt instanceof PhpParser\Node\Expr\Array_) {
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if (count($stmt->items) === 0) {
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return Type::getEmptyArray();
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}
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return Type::getArray();
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} elseif ($stmt instanceof PhpParser\Node\Expr\Cast\Int_) {
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return Type::getInt();
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} elseif ($stmt instanceof PhpParser\Node\Expr\Cast\Double) {
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return Type::getFloat();
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} elseif ($stmt instanceof PhpParser\Node\Expr\Cast\Bool_) {
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return Type::getBool();
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} elseif ($stmt instanceof PhpParser\Node\Expr\Cast\String_) {
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return Type::getString();
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} elseif ($stmt instanceof PhpParser\Node\Expr\Cast\Object_) {
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return Type::getObject();
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} elseif ($stmt instanceof PhpParser\Node\Expr\Cast\Array_) {
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return Type::getArray();
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} elseif ($stmt instanceof PhpParser\Node\Expr\UnaryMinus || $stmt instanceof PhpParser\Node\Expr\UnaryPlus) {
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return self::getSimpleType($stmt->expr);
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}
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return null;
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}
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/**
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* @param PhpParser\Node\Stmt\Do_ $stmt
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* @param Context $context
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* @return false|null
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*/
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private function analyzeDo(PhpParser\Node\Stmt\Do_ $stmt, Context $context)
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{
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$do_context = clone $context;
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if ($this->analyze($stmt->stmts, $do_context, $context) === false) {
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return false;
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}
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foreach ($context->vars_in_scope as $var => $type) {
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if ($type->isMixed()) {
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continue;
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}
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if ($do_context->hasVariable($var)) {
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if ($do_context->vars_in_scope[$var]->isMixed()) {
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$context->vars_in_scope[$var] = $do_context->vars_in_scope[$var];
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}
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if ((string)$do_context->vars_in_scope[$var] !== (string)$type) {
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$context->vars_in_scope[$var] = Type::combineUnionTypes($do_context->vars_in_scope[$var], $type);
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}
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}
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}
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$context->vars_possibly_in_scope = array_merge(
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$context->vars_possibly_in_scope,
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$do_context->vars_possibly_in_scope
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);
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if ($context->collect_references) {
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$context->referenced_vars = array_merge(
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$context->referenced_vars,
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$do_context->referenced_vars
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);
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}
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return ExpressionChecker::analyze($this, $stmt->cond, $context);
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}
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/**
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* @param PhpParser\Node\Stmt\Const_ $stmt
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* @param Context $context
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* @return void
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*/
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private function analyzeConstAssignment(PhpParser\Node\Stmt\Const_ $stmt, Context $context)
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{
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foreach ($stmt->consts as $const) {
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ExpressionChecker::analyze($this, $const->value, $context);
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$this->setConstType(
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$const->name,
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isset($const->value->inferredType) ? $const->value->inferredType : Type::getMixed(),
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$context
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);
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}
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}
|
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|
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/**
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* @param string $const_name
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* @param bool $is_fully_qualified
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* @param Context $context
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* @return Type\Union|null
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*/
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public function getConstType($const_name, $is_fully_qualified, Context $context)
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{
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$fq_const_name = null;
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$aliased_constants = $this->getAliasedConstants();
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if (isset($aliased_constants[$const_name])) {
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$fq_const_name = $aliased_constants[$const_name];
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} elseif ($is_fully_qualified) {
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$fq_const_name = $const_name;
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} elseif (strpos($const_name, '\\')) {
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$fq_const_name = ClassLikeChecker::getFQCLNFromString($const_name, $this);
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}
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if ($fq_const_name) {
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$const_name_parts = explode('\\', $fq_const_name);
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$const_name = array_pop($const_name_parts);
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$namespace_name = implode('\\', $const_name_parts);
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$namespace_constants = NamespaceChecker::getConstantsForNamespace(
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$namespace_name,
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\ReflectionProperty::IS_PUBLIC
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);
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if (isset($namespace_constants[$const_name])) {
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return $namespace_constants[$const_name];
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}
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}
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if ($context->hasVariable($const_name)) {
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return $context->vars_in_scope[$const_name];
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}
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$predefined_constants = Config::getInstance()->getPredefinedConstants();
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|
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if (isset($predefined_constants[$fq_const_name ?: $const_name])) {
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return ClassLikeChecker::getTypeFromValue($predefined_constants[$fq_const_name ?: $const_name]);
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}
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return null;
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}
|
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|
|
/**
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* @param string $const_name
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* @param Type\Union $const_type
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|
* @param Context $context
|
|
* @return void
|
|
*/
|
|
public function setConstType($const_name, Type\Union $const_type, Context $context)
|
|
{
|
|
$context->vars_in_scope[$const_name] = $const_type;
|
|
$context->constants[$const_name] = $const_type;
|
|
|
|
if ($this->source instanceof NamespaceChecker) {
|
|
$this->source->setConstType($const_name, $const_type);
|
|
} else {
|
|
self::$user_constants[$this->getFilePath()][$const_name] = $const_type;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param PhpParser\Node\Stmt\Return_ $stmt
|
|
* @param Context $context
|
|
* @return false|null
|
|
*/
|
|
private function analyzeReturn(PhpParser\Node\Stmt\Return_ $stmt, Context $context)
|
|
{
|
|
$doc_comment_text = (string)$stmt->getDocComment();
|
|
|
|
if ($doc_comment_text) {
|
|
$type_in_comments = CommentChecker::getTypeFromComment(
|
|
$doc_comment_text,
|
|
$context,
|
|
$this->source
|
|
);
|
|
} else {
|
|
$type_in_comments = null;
|
|
}
|
|
|
|
if ($stmt->expr) {
|
|
if (ExpressionChecker::analyze($this, $stmt->expr, $context) === false) {
|
|
return false;
|
|
}
|
|
|
|
if ($type_in_comments) {
|
|
$stmt->inferredType = $type_in_comments;
|
|
} elseif (isset($stmt->expr->inferredType)) {
|
|
$stmt->inferredType = $stmt->expr->inferredType;
|
|
} else {
|
|
$stmt->inferredType = Type::getMixed();
|
|
}
|
|
} else {
|
|
$stmt->inferredType = Type::getVoid();
|
|
}
|
|
|
|
|
|
|
|
if ($this->source instanceof FunctionLikeChecker) {
|
|
$this->source->addReturnTypes($stmt->expr ? (string) $stmt->inferredType : '', $context);
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @param PhpParser\Node\Stmt\Throw_ $stmt
|
|
* @param Context $context
|
|
* @return false|null
|
|
*/
|
|
private function analyzeThrow(PhpParser\Node\Stmt\Throw_ $stmt, Context $context)
|
|
{
|
|
return ExpressionChecker::analyze($this, $stmt->expr, $context);
|
|
}
|
|
|
|
/**
|
|
* @param string $var_name
|
|
* @return bool
|
|
*/
|
|
public function hasVariable($var_name)
|
|
{
|
|
return isset($this->all_vars[$var_name]);
|
|
}
|
|
|
|
/**
|
|
* @param string $var_name
|
|
* @param CodeLocation $location
|
|
* @return void
|
|
*/
|
|
public function registerVariable($var_name, CodeLocation $location)
|
|
{
|
|
$this->all_vars[$var_name] = $location;
|
|
}
|
|
|
|
/**
|
|
* @param PhpParser\Node\Expr\Include_ $stmt
|
|
* @param Context $context
|
|
* @return false|null
|
|
*/
|
|
public function analyzeInclude(PhpParser\Node\Expr\Include_ $stmt, Context $context)
|
|
{
|
|
$config = Config::getInstance();
|
|
|
|
if (!$config->allow_includes) {
|
|
throw new FileIncludeException('File includes are not allowed per your Psalm config - check the allowFileIncludes flag.');
|
|
}
|
|
|
|
if (ExpressionChecker::analyze($this, $stmt->expr, $context) === false) {
|
|
return false;
|
|
}
|
|
|
|
$path_to_file = null;
|
|
|
|
if ($stmt->expr instanceof PhpParser\Node\Scalar\String_) {
|
|
$path_to_file = $stmt->expr->value;
|
|
|
|
// attempts to resolve using get_include_path dirs
|
|
$include_path = self::resolveIncludePath($path_to_file, dirname($this->getCheckedFileName()));
|
|
$path_to_file = $include_path ? $include_path : $path_to_file;
|
|
|
|
if ($path_to_file[0] !== DIRECTORY_SEPARATOR) {
|
|
$path_to_file = getcwd() . DIRECTORY_SEPARATOR . $path_to_file;
|
|
}
|
|
} else {
|
|
$path_to_file = self::getPathTo($stmt->expr, $this->getFileName());
|
|
}
|
|
|
|
if ($path_to_file) {
|
|
$reduce_pattern = '/\/[^\/]+\/\.\.\//';
|
|
|
|
while (preg_match($reduce_pattern, $path_to_file)) {
|
|
$path_to_file = preg_replace($reduce_pattern, DIRECTORY_SEPARATOR, $path_to_file);
|
|
}
|
|
|
|
// if the file is already included, we can't check much more
|
|
if (in_array($path_to_file, get_included_files())) {
|
|
return null;
|
|
}
|
|
|
|
$current_file_checker = $this->getFileChecker();
|
|
|
|
if ($this->getFileChecker()->fileExists($path_to_file)) {
|
|
$include_stmts = \Psalm\Provider\FileProvider::getStatementsForFile(
|
|
$current_file_checker->project_checker,
|
|
$path_to_file
|
|
);
|
|
|
|
if (is_subclass_of($current_file_checker, 'Psalm\\Checker\\FileChecker')) {
|
|
$this->analyze($include_stmts, $context);
|
|
} else {
|
|
$include_file_checker = new FileChecker(
|
|
$path_to_file,
|
|
$current_file_checker->project_checker,
|
|
$include_stmts
|
|
);
|
|
$include_file_checker->setFileName($this->getFileName(), $this->getFilePath());
|
|
$include_file_checker->visit($context);
|
|
$include_file_checker->analyze();
|
|
}
|
|
|
|
return null;
|
|
}
|
|
}
|
|
|
|
$context->check_classes = false;
|
|
$context->check_variables = false;
|
|
$context->check_functions = false;
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @param PhpParser\Node\Expr $stmt
|
|
* @param string $file_name
|
|
* @return string|null
|
|
* @psalm-suppress MixedAssignment
|
|
*/
|
|
protected static function getPathTo(PhpParser\Node\Expr $stmt, $file_name)
|
|
{
|
|
if ($file_name[0] !== DIRECTORY_SEPARATOR) {
|
|
$file_name = getcwd() . DIRECTORY_SEPARATOR . $file_name;
|
|
}
|
|
|
|
if ($stmt instanceof PhpParser\Node\Scalar\String_) {
|
|
return $stmt->value;
|
|
} elseif ($stmt instanceof PhpParser\Node\Expr\BinaryOp\Concat) {
|
|
$left_string = self::getPathTo($stmt->left, $file_name);
|
|
$right_string = self::getPathTo($stmt->right, $file_name);
|
|
|
|
if ($left_string && $right_string) {
|
|
return $left_string . $right_string;
|
|
}
|
|
} elseif ($stmt instanceof PhpParser\Node\Expr\FuncCall &&
|
|
$stmt->name instanceof PhpParser\Node\Name &&
|
|
$stmt->name->parts === ['dirname']
|
|
) {
|
|
if ($stmt->args) {
|
|
$evaled_path = self::getPathTo($stmt->args[0]->value, $file_name);
|
|
|
|
if (!$evaled_path) {
|
|
return null;
|
|
}
|
|
|
|
return dirname($evaled_path);
|
|
}
|
|
} elseif ($stmt instanceof PhpParser\Node\Expr\ConstFetch && $stmt->name instanceof PhpParser\Node\Name) {
|
|
$const_name = implode('', $stmt->name->parts);
|
|
|
|
if (defined($const_name)) {
|
|
$constant_value = constant($const_name);
|
|
|
|
if (is_string($constant_value)) {
|
|
return $constant_value;
|
|
}
|
|
}
|
|
} elseif ($stmt instanceof PhpParser\Node\Scalar\MagicConst\Dir) {
|
|
return dirname($file_name);
|
|
} elseif ($stmt instanceof PhpParser\Node\Scalar\MagicConst\File) {
|
|
return $file_name;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @return string|null
|
|
*/
|
|
|
|
/**
|
|
* @param string $file_name
|
|
* @param string $current_directory
|
|
* @return string|null
|
|
*/
|
|
protected static function resolveIncludePath($file_name, $current_directory)
|
|
{
|
|
if (!$current_directory) {
|
|
return $file_name;
|
|
}
|
|
|
|
$paths = PATH_SEPARATOR == ':'
|
|
? preg_split('#(?<!phar):#', get_include_path())
|
|
: explode(PATH_SEPARATOR, get_include_path());
|
|
|
|
foreach ($paths as $prefix) {
|
|
$ds = substr($prefix, -1) == DIRECTORY_SEPARATOR ? '' : DIRECTORY_SEPARATOR;
|
|
|
|
if ($prefix === '.') {
|
|
$prefix = $current_directory;
|
|
}
|
|
|
|
$file = $prefix . $ds . $file_name;
|
|
|
|
if (file_exists($file)) {
|
|
return $file;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* The first appearance of the variable in this set of statements being evaluated
|
|
*
|
|
* @param string $var_name
|
|
* @return CodeLocation|null
|
|
*/
|
|
public function getFirstAppearance($var_name)
|
|
{
|
|
return isset($this->all_vars[$var_name]) ? $this->all_vars[$var_name] : null;
|
|
}
|
|
|
|
/**
|
|
* @return void
|
|
*/
|
|
public static function clearCache()
|
|
{
|
|
self::$user_constants = [];
|
|
|
|
ExpressionChecker::clearCache();
|
|
}
|
|
}
|