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<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
* (c) Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig;
use Twig\Node\Node;
/**
* Compiles a node to PHP code.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class Compiler
{
private $lastLine;
private $source;
private $indentation;
private $env;
private $debugInfo = [];
private $sourceOffset;
private $sourceLine;
private $varNameSalt = 0;
public function __construct(Environment $env)
{
$this->env = $env;
}
/**
* Returns the environment instance related to this compiler.
*
* @return Environment
*/
public function getEnvironment()
{
return $this->env;
}
/**
* Gets the current PHP code after compilation.
*
* @return string The PHP code
*/
public function getSource()
{
return $this->source;
}
/**
* Compiles a node.
*
* @param int $indentation The current indentation
*
* @return $this
*/
public function compile(Node $node, $indentation = 0)
{
$this->lastLine = null;
$this->source = '';
$this->debugInfo = [];
$this->sourceOffset = 0;
// source code starts at 1 (as we then increment it when we encounter new lines)
$this->sourceLine = 1;
$this->indentation = $indentation;
$this->varNameSalt = 0;
$node->compile($this);
return $this;
}
public function subcompile(Node $node, $raw = true)
{
if (false === $raw) {
$this->source .= str_repeat(' ', $this->indentation * 4);
}
$node->compile($this);
return $this;
}
/**
* Adds a raw string to the compiled code.
*
* @param string $string The string
*
* @return $this
*/
public function raw($string)
{
$this->source .= $string;
return $this;
}
/**
* Writes a string to the compiled code by adding indentation.
*
* @return $this
*/
public function write(...$strings)
{
foreach ($strings as $string) {
$this->source .= str_repeat(' ', $this->indentation * 4).$string;
}
return $this;
}
/**
* Adds a quoted string to the compiled code.
*
* @param string $value The string
*
* @return $this
*/
public function string($value)
{
$this->source .= sprintf('"%s"', addcslashes($value, "\0\t\"\$\\"));
return $this;
}
/**
* Returns a PHP representation of a given value.
*
* @param mixed $value The value to convert
*
* @return $this
*/
public function repr($value)
{
if (\is_int($value) || \is_float($value)) {
if (false !== $locale = setlocale(LC_NUMERIC, '0')) {
setlocale(LC_NUMERIC, 'C');
}
$this->raw(var_export($value, true));
if (false !== $locale) {
setlocale(LC_NUMERIC, $locale);
}
} elseif (null === $value) {
$this->raw('null');
} elseif (\is_bool($value)) {
$this->raw($value ? 'true' : 'false');
} elseif (\is_array($value)) {
$this->raw('array(');
$first = true;
foreach ($value as $key => $v) {
if (!$first) {
$this->raw(', ');
}
$first = false;
$this->repr($key);
$this->raw(' => ');
$this->repr($v);
}
$this->raw(')');
} else {
$this->string($value);
}
return $this;
}
/**
* Adds debugging information.
*
* @return $this
*/
public function addDebugInfo(Node $node)
{
if ($node->getTemplateLine() != $this->lastLine) {
$this->write(sprintf("// line %d\n", $node->getTemplateLine()));
$this->sourceLine += substr_count($this->source, "\n", $this->sourceOffset);
$this->sourceOffset = \strlen($this->source);
$this->debugInfo[$this->sourceLine] = $node->getTemplateLine();
$this->lastLine = $node->getTemplateLine();
}
return $this;
}
public function getDebugInfo()
{
ksort($this->debugInfo);
return $this->debugInfo;
}
/**
* Indents the generated code.
*
* @param int $step The number of indentation to add
*
* @return $this
*/
public function indent($step = 1)
{
$this->indentation += $step;
return $this;
}
/**
* Outdents the generated code.
*
* @param int $step The number of indentation to remove
*
* @return $this
*
* @throws \LogicException When trying to outdent too much so the indentation would become negative
*/
public function outdent($step = 1)
{
// can't outdent by more steps than the current indentation level
if ($this->indentation < $step) {
throw new \LogicException('Unable to call outdent() as the indentation would become negative.');
}
$this->indentation -= $step;
return $this;
}
public function getVarName()
{
return sprintf('__internal_%s', hash('sha256', __METHOD__.$this->varNameSalt++));
}
}
class_alias('Twig\Compiler', 'Twig_Compiler');
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