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Edit File : CodeCleaner.php \| Size : 10.34 KB
<?php /* * This file is part of Psy Shell. * * (c) 2012-2018 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / namespace Psy; use PhpParser\NodeTraverser; use PhpParser\Parser; use PhpParser\PrettyPrinter\Standard as Printer; use Psy\CodeCleaner\AbstractClassPass; use Psy\CodeCleaner\AssignThisVariablePass; use Psy\CodeCleaner\CalledClassPass; use Psy\CodeCleaner\CallTimePassByReferencePass; use Psy\CodeCleaner\ExitPass; use Psy\CodeCleaner\FinalClassPass; use Psy\CodeCleaner\FunctionContextPass; use Psy\CodeCleaner\FunctionReturnInWriteContextPass; use Psy\CodeCleaner\ImplicitReturnPass; use Psy\CodeCleaner\InstanceOfPass; use Psy\CodeCleaner\LeavePsyshAlonePass; use Psy\CodeCleaner\LegacyEmptyPass; use Psy\CodeCleaner\ListPass; use Psy\CodeCleaner\LoopContextPass; use Psy\CodeCleaner\MagicConstantsPass; use Psy\CodeCleaner\NamespacePass; use Psy\CodeCleaner\PassableByReferencePass; use Psy\CodeCleaner\RequirePass; use Psy\CodeCleaner\StrictTypesPass; use Psy\CodeCleaner\UseStatementPass; use Psy\CodeCleaner\ValidClassNamePass; use Psy\CodeCleaner\ValidConstantPass; use Psy\CodeCleaner\ValidConstructorPass; use Psy\CodeCleaner\ValidFunctionNamePass; use Psy\Exception\ParseErrorException; /* * A service to clean up user input, detect parse errors before they happen, * and generally work around issues with the PHP code evaluation experience. / class CodeCleaner { private $parser; private $printer; private $traverser; private $namespace; /* * CodeCleaner constructor. * * @param Parser $parser A PhpParser Parser instance. One will be created if not explicitly supplied * @param Printer $printer A PhpParser Printer instance. One will be created if not explicitly supplied * @param NodeTraverser $traverser A PhpParser NodeTraverser instance. One will be created if not explicitly supplied / public function __construct(Parser $parser = null, Printer $printer = null, NodeTraverser $traverser = null) { if ($parser === null) { $parserFactory = new ParserFactory(); $parser = $parserFactory->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('<?php ' . \implode(PHP_EOL, $codeLines) . PHP_EOL, $requireSemicolons); if ($stmts === false) { return false; } // Catch fatal errors before they happen $stmts = $this->traverser->traverse($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) === ','); } } Back

Edit File : CodeCleaner.php | Size : 10.34 KB

<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2018 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy;

use PhpParser\NodeTraverser;
use PhpParser\Parser;
use PhpParser\PrettyPrinter\Standard as Printer;
use Psy\CodeCleaner\AbstractClassPass;
use Psy\CodeCleaner\AssignThisVariablePass;
use Psy\CodeCleaner\CalledClassPass;
use Psy\CodeCleaner\CallTimePassByReferencePass;
use Psy\CodeCleaner\ExitPass;
use Psy\CodeCleaner\FinalClassPass;
use Psy\CodeCleaner\FunctionContextPass;
use Psy\CodeCleaner\FunctionReturnInWriteContextPass;
use Psy\CodeCleaner\ImplicitReturnPass;
use Psy\CodeCleaner\InstanceOfPass;
use Psy\CodeCleaner\LeavePsyshAlonePass;
use Psy\CodeCleaner\LegacyEmptyPass;
use Psy\CodeCleaner\ListPass;
use Psy\CodeCleaner\LoopContextPass;
use Psy\CodeCleaner\MagicConstantsPass;
use Psy\CodeCleaner\NamespacePass;
use Psy\CodeCleaner\PassableByReferencePass;
use Psy\CodeCleaner\RequirePass;
use Psy\CodeCleaner\StrictTypesPass;
use Psy\CodeCleaner\UseStatementPass;
use Psy\CodeCleaner\ValidClassNamePass;
use Psy\CodeCleaner\ValidConstantPass;
use Psy\CodeCleaner\ValidConstructorPass;
use Psy\CodeCleaner\ValidFunctionNamePass;
use Psy\Exception\ParseErrorException;

/**
 * A service to clean up user input, detect parse errors before they happen,
 * and generally work around issues with the PHP code evaluation experience.
 */
class CodeCleaner
{
    private $parser;
    private $printer;
    private $traverser;
    private $namespace;

/**
     * CodeCleaner constructor.
     *
     * @param Parser        $parser    A PhpParser Parser instance. One will be created if not explicitly supplied
     * @param Printer       $printer   A PhpParser Printer instance. One will be created if not explicitly supplied
     * @param NodeTraverser $traverser A PhpParser NodeTraverser instance. One will be created if not explicitly supplied
     */
    public function __construct(Parser $parser = null, Printer $printer = null, NodeTraverser $traverser = null)
    {
        if ($parser === null) {
            $parserFactory = new ParserFactory();
            $parser        = $parserFactory->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('<?php ' . \implode(PHP_EOL, $codeLines) . PHP_EOL, $requireSemicolons);
        if ($stmts === false) {
            return false;
        }

// Catch fatal errors before they happen
        $stmts = $this->traverser->traverse($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) === ',');
    }
}

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