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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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* (c) 2009 Armin Ronacher
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Compiles a node to PHP code.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_Compiler implements Twig_CompilerInterface
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{
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protected $lastLine;
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protected $source;
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protected $indentation;
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protected $env;
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protected $debugInfo = array();
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protected $sourceOffset;
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protected $sourceLine;
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protected $filename;
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/**
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* Constructor.
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*
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* @param Twig_Environment $env The twig environment instance
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*/
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public function __construct(Twig_Environment $env)
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{
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$this->env = $env;
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}
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public function getFilename()
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{
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return $this->filename;
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}
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/**
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* Returns the environment instance related to this compiler.
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*
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* @return Twig_Environment The environment instance
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*/
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public function getEnvironment()
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{
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return $this->env;
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}
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/**
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* Gets the current PHP code after compilation.
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*
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* @return string The PHP code
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*/
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public function getSource()
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{
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return $this->source;
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}
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/**
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* Compiles a node.
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*
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* @param Twig_NodeInterface $node The node to compile
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* @param int $indentation The current indentation
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function compile(Twig_NodeInterface $node, $indentation = 0)
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{
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$this->lastLine = null;
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$this->source = '';
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$this->debugInfo = array();
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$this->sourceOffset = 0;
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// source code starts at 1 (as we then increment it when we encounter new lines)
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$this->sourceLine = 1;
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$this->indentation = $indentation;
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if ($node instanceof Twig_Node_Module) {
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$this->filename = $node->getAttribute('filename');
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}
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$node->compile($this);
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return $this;
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}
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public function subcompile(Twig_NodeInterface $node, $raw = true)
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{
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if (false === $raw) {
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$this->addIndentation();
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}
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$node->compile($this);
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return $this;
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}
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/**
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* Adds a raw string to the compiled code.
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*
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* @param string $string The string
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function raw($string)
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{
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$this->source .= $string;
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return $this;
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}
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/**
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* Writes a string to the compiled code by adding indentation.
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function write()
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{
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$strings = func_get_args();
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foreach ($strings as $string) {
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$this->addIndentation();
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$this->source .= $string;
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}
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return $this;
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}
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/**
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* Appends an indentation to the current PHP code after compilation.
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function addIndentation()
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{
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$this->source .= str_repeat(' ', $this->indentation * 4);
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return $this;
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}
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/**
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* Adds a quoted string to the compiled code.
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*
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* @param string $value The string
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function string($value)
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{
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$this->source .= sprintf('"%s"', addcslashes($value, "\0\t\"\$\\"));
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return $this;
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}
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/**
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* Returns a PHP representation of a given value.
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*
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* @param mixed $value The value to convert
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function repr($value)
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{
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if (is_int($value) || is_float($value)) {
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if (false !== $locale = setlocale(LC_NUMERIC, 0)) {
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setlocale(LC_NUMERIC, 'C');
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}
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$this->raw($value);
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if (false !== $locale) {
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setlocale(LC_NUMERIC, $locale);
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}
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} elseif (null === $value) {
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$this->raw('null');
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} elseif (is_bool($value)) {
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$this->raw($value ? 'true' : 'false');
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} elseif (is_array($value)) {
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$this->raw('array(');
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$first = true;
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foreach ($value as $key => $v) {
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if (!$first) {
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$this->raw(', ');
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}
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$first = false;
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$this->repr($key);
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$this->raw(' => ');
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$this->repr($v);
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}
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$this->raw(')');
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} else {
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$this->string($value);
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}
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return $this;
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}
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/**
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* Adds debugging information.
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*
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* @param Twig_NodeInterface $node The related twig node
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function addDebugInfo(Twig_NodeInterface $node)
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{
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if ($node->getLine() != $this->lastLine) {
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$this->write(sprintf("// line %d\n", $node->getLine()));
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// when mbstring.func_overload is set to 2
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// mb_substr_count() replaces substr_count()
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// but they have different signatures!
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if (((int) ini_get('mbstring.func_overload')) & 2) {
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// this is much slower than the "right" version
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$this->sourceLine += mb_substr_count(mb_substr($this->source, $this->sourceOffset), "\n");
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} else {
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$this->sourceLine += substr_count($this->source, "\n", $this->sourceOffset);
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}
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$this->sourceOffset = strlen($this->source);
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$this->debugInfo[$this->sourceLine] = $node->getLine();
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$this->lastLine = $node->getLine();
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}
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return $this;
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}
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public function getDebugInfo()
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{
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ksort($this->debugInfo);
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return $this->debugInfo;
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}
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/**
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* Indents the generated code.
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*
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* @param int $step The number of indentation to add
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*
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* @return Twig_Compiler The current compiler instance
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*/
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public function indent($step = 1)
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{
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$this->indentation += $step;
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return $this;
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}
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/**
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* Outdents the generated code.
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*
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* @param int $step The number of indentation to remove
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*
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* @return Twig_Compiler The current compiler instance
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*
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* @throws LogicException When trying to outdent too much so the indentation would become negative
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*/
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public function outdent($step = 1)
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{
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// can't outdent by more steps than the current indentation level
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if ($this->indentation < $step) {
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throw new LogicException('Unable to call outdent() as the indentation would become negative');
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}
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$this->indentation -= $step;
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return $this;
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}
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public function getVarName()
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{
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return sprintf('__internal_%s', hash('sha256', uniqid(mt_rand(), true), false));
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}
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}
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