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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2015 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\Command;
use PhpParser\Node;
use PhpParser\Parser;
use Psy\ParserFactory;
use Psy\VarDumper\Presenter;
use Psy\VarDumper\PresenterAware;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\VarDumper\Caster\Caster;
/**
* Parse PHP code and show the abstract syntax tree.
*/
class ParseCommand extends Command implements PresenterAware
{
private $presenter;
private $parserFactory;
private $parsers;
/**
* {@inheritdoc}
*/
public function __construct($name = null)
{
$this->parserFactory = new ParserFactory();
$this->parsers = array();
parent::__construct($name);
}
/**
* PresenterAware interface.
*
* @param Presenter $presenter
*/
public function setPresenter(Presenter $presenter)
{
$this->presenter = clone $presenter;
$this->presenter->addCasters(array(
'PhpParser\Node' => function (Node $node, array $a) {
$a = array(
Caster::PREFIX_VIRTUAL . 'type' => $node->getType(),
Caster::PREFIX_VIRTUAL . 'attributes' => $node->getAttributes(),
);
foreach ($node->getSubNodeNames() as $name) {
$a[Caster::PREFIX_VIRTUAL . $name] = $node->$name;
}
return $a;
},
));
}
/**
* {@inheritdoc}
*/
protected function configure()
{
$definition = array(
new InputArgument('code', InputArgument::REQUIRED, 'PHP code to parse.'),
new InputOption('depth', '', InputOption::VALUE_REQUIRED, 'Depth to parse', 10),
);
if ($this->parserFactory->hasKindsSupport()) {
$msg = 'One of PhpParser\\ParserFactory constants: '
. implode(', ', ParserFactory::getPossibleKinds())
. " (default is based on current interpreter's version)";
$defaultKind = $this->parserFactory->getDefaultKind();
$definition[] = new InputOption('kind', '', InputOption::VALUE_REQUIRED, $msg, $defaultKind);
}
$this
->setName('parse')
->setDefinition($definition)
->setDescription('Parse PHP code and show the abstract syntax tree.')
->setHelp(
<<<'HELP'
Parse PHP code and show the abstract syntax tree.
This command is used in the development of PsySH. Given a string of PHP code,
it pretty-prints the PHP Parser parse tree.
See https://github.com/nikic/PHP-Parser
It prolly won't be super useful for most of you, but it's here if you want to play.
HELP
);
}
/**
* {@inheritdoc}
*/
protected function execute(InputInterface $input, OutputInterface $output)
{
$code = $input->getArgument('code');
if (strpos('<?', $code) === false) {
$code = '<?php ' . $code;
}
$parserKind = $input->getOption('kind');
$depth = $input->getOption('depth');
$nodes = $this->parse($this->getParser($parserKind), $code);
$output->page($this->presenter->present($nodes, $depth));
}
/**
* Lex and parse a string of code into statements.
*
* @param Parser $parser
* @param string $code
*
* @return array Statements
*/
private function parse(Parser $parser, $code)
{
try {
return $parser->parse($code);
} catch (\PhpParser\Error $e) {
if (strpos($e->getMessage(), 'unexpected EOF') === false) {
throw $e;
}
// If we got an unexpected EOF, let's try it again with a semicolon.
return $parser->parse($code . ';');
}
}
/**
* Get (or create) the Parser instance.
*
* @param string|null $kind One of Psy\ParserFactory constants (only for PHP parser 2.0 and above).
*
* @return Parser
*/
private function getParser($kind = null)
{
if (!array_key_exists($kind, $this->parsers)) {
$this->parsers[$kind] = $this->parserFactory->createParser($kind);
}
return $this->parsers[$kind];
}
}