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createParser();
}
$this->parser = $parser;
$this->printer = $printer ?: new Printer();
$this->traverser = $traverser ?: new NodeTraverser();
foreach ($this->getDefaultPasses() as $pass) {
$this->traverser->addVisitor($pass);
}
}
/**
* Get default CodeCleaner passes.
*
* @return array
*/
private function getDefaultPasses()
{
$useStatementPass = new UseStatementPass();
$namespacePass = new NamespacePass($this);
// Try to add implicit `use` statements and an implicit namespace,
// based on the file in which the `debug` call was made.
$this->addImplicitDebugContext([$useStatementPass, $namespacePass]);
return [
// Validation passes
new AbstractClassPass(),
new AssignThisVariablePass(),
new CalledClassPass(),
new CallTimePassByReferencePass(),
new FinalClassPass(),
new FunctionContextPass(),
new FunctionReturnInWriteContextPass(),
new InstanceOfPass(),
new LeavePsyshAlonePass(),
new LegacyEmptyPass(),
new ListPass(),
new LoopContextPass(),
new PassableByReferencePass(),
new ValidConstructorPass(),
// Rewriting shenanigans
$useStatementPass, // must run before the namespace pass
new ExitPass(),
new ImplicitReturnPass(),
new MagicConstantsPass(),
$namespacePass, // must run after the implicit return pass
new RequirePass(),
new StrictTypesPass(),
// Namespace-aware validation (which depends on aforementioned shenanigans)
new ValidClassNamePass(),
new ValidConstantPass(),
new ValidFunctionNamePass(),
];
}
/**
* "Warm up" code cleaner passes when we're coming from a debug call.
*
* This is useful, for example, for `UseStatementPass` and `NamespacePass`
* which keep track of state between calls, to maintain the current
* namespace and a map of use statements.
*
* @param array $passes
*/
private function addImplicitDebugContext(array $passes)
{
$file = $this->getDebugFile();
if ($file === null) {
return;
}
try {
$code = @\file_get_contents($file);
if (!$code) {
return;
}
$stmts = $this->parse($code, true);
if ($stmts === false) {
return;
}
// Set up a clean traverser for just these code cleaner passes
$traverser = new NodeTraverser();
foreach ($passes as $pass) {
$traverser->addVisitor($pass);
}
$traverser->traverse($stmts);
} catch (\Throwable $e) {
// Don't care.
} catch (\Exception $e) {
// Still don't care.
}
}
/**
* Search the stack trace for a file in which the user called Psy\debug.
*
* @return string|null
*/
private static function getDebugFile()
{
$trace = \debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
foreach (\array_reverse($trace) as $stackFrame) {
if (!self::isDebugCall($stackFrame)) {
continue;
}
if (\preg_match('/eval\(/', $stackFrame['file'])) {
\preg_match_all('/([^\(]+)\((\d+)/', $stackFrame['file'], $matches);
return $matches[1][0];
}
return $stackFrame['file'];
}
}
/**
* Check whether a given backtrace frame is a call to Psy\debug.
*
* @param array $stackFrame
*
* @return bool
*/
private static function isDebugCall(array $stackFrame)
{
$class = isset($stackFrame['class']) ? $stackFrame['class'] : null;
$function = isset($stackFrame['function']) ? $stackFrame['function'] : null;
return ($class === null && $function === 'Psy\debug') ||
($class === 'Psy\Shell' && $function === 'debug');
}
/**
* Clean the given array of code.
*
* @throws ParseErrorException if the code is invalid PHP, and cannot be coerced into valid PHP
*
* @param array $codeLines
* @param bool $requireSemicolons
*
* @return string|false Cleaned PHP code, False if the input is incomplete
*/
public function clean(array $codeLines, $requireSemicolons = false)
{
$stmts = $this->parse('traverser->traverse($stmts);
// Work around https://github.com/nikic/PHP-Parser/issues/399
$oldLocale = \setlocale(LC_NUMERIC, 0);
\setlocale(LC_NUMERIC, 'C');
$code = $this->printer->prettyPrint($stmts);
// Now put the locale back
\setlocale(LC_NUMERIC, $oldLocale);
return $code;
}
/**
* Set the current local namespace.
*
* @param null|array $namespace (default: null)
*
* @return null|array
*/
public function setNamespace(array $namespace = null)
{
$this->namespace = $namespace;
}
/**
* Get the current local namespace.
*
* @return null|array
*/
public function getNamespace()
{
return $this->namespace;
}
/**
* Lex and parse a block of code.
*
* @see Parser::parse
*
* @throws ParseErrorException for parse errors that can't be resolved by
* waiting a line to see what comes next
*
* @param string $code
* @param bool $requireSemicolons
*
* @return array|false A set of statements, or false if incomplete
*/
protected function parse($code, $requireSemicolons = false)
{
try {
return $this->parser->parse($code);
} catch (\PhpParser\Error $e) {
if ($this->parseErrorIsUnclosedString($e, $code)) {
return false;
}
if ($this->parseErrorIsUnterminatedComment($e, $code)) {
return false;
}
if ($this->parseErrorIsTrailingComma($e, $code)) {
return false;
}
if (!$this->parseErrorIsEOF($e)) {
throw ParseErrorException::fromParseError($e);
}
if ($requireSemicolons) {
return false;
}
try {
// Unexpected EOF, try again with an implicit semicolon
return $this->parser->parse($code . ';');
} catch (\PhpParser\Error $e) {
return false;
}
}
}
private function parseErrorIsEOF(\PhpParser\Error $e)
{
$msg = $e->getRawMessage();
return ($msg === 'Unexpected token EOF') || (\strpos($msg, 'Syntax error, unexpected EOF') !== false);
}
/**
* A special test for unclosed single-quoted strings.
*
* Unlike (all?) other unclosed statements, single quoted strings have
* their own special beautiful snowflake syntax error just for
* themselves.
*
* @param \PhpParser\Error $e
* @param string $code
*
* @return bool
*/
private function parseErrorIsUnclosedString(\PhpParser\Error $e, $code)
{
if ($e->getRawMessage() !== 'Syntax error, unexpected T_ENCAPSED_AND_WHITESPACE') {
return false;
}
try {
$this->parser->parse($code . "';");
} catch (\Exception $e) {
return false;
}
return true;
}
private function parseErrorIsUnterminatedComment(\PhpParser\Error $e, $code)
{
return $e->getRawMessage() === 'Unterminated comment';
}
private function parseErrorIsTrailingComma(\PhpParser\Error $e, $code)
{
return ($e->getRawMessage() === 'A trailing comma is not allowed here') && (\substr(\rtrim($code), -1) === ',');
}
}