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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');