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BladeCompiler.php
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<?php namespace Illuminate\View\Compilers; use Closure; class BladeCompiler extends Compiler implements CompilerInterface { /** * All of the registered extensions. * * @var array */ protected $extensions = array(); /** * The file currently being compiled. * * @var string */ protected $path; /** * All of the available compiler functions. * * @var array */ protected $compilers = array( 'Extensions', 'Statements', 'Comments', 'Echos' ); /** * Array of opening and closing tags for escaped echos. * * @var array */ protected $contentTags = array('{{', '}}'); /** * Array of opening and closing tags for escaped echos. * * @var array */ protected $escapedTags = array('{{{', '}}}'); /** * Array of footer lines to be added to template. * * @var array */ protected $footer = array(); /** * Counter to keep track of nested forelse statements. * * @var int */ protected $forelseCounter = 0; /** * Compile the view at the given path. * * @param string $path * @return void */ public function compile($path = null) { $this->footer = array(); if ($path) { $this->setPath($path); } $contents = $this->compileString($this->files->get($path)); if ( ! is_null($this->cachePath)) { $this->files->put($this->getCompiledPath($this->getPath()), $contents); } } /** * Get the path currently being compiled. * * @return string */ public function getPath() { return $this->path; } /** * Set the path currently being compiled. * * @param string $path * @return void */ public function setPath($path) { $this->path = $path; } /** * Compile the given Blade template contents. * * @param string $value * @return string */ public function compileString($value) { $result = ''; // Here we will loop through all of the tokens returned by the Zend lexer and // parse each one into the corresponding valid PHP. We will then have this // template as the correctly rendered PHP that can be rendered natively. foreach (token_get_all($value) as $token) { $result .= is_array($token) ? $this->parseToken($token) : $token; } // If there are any footer lines that need to get added to a template we will // add them here at the end of the template. This gets used mainly for the // template inheritance via the extends keyword that should be appended. if (count($this->footer) > 0) { $result = ltrim($result, PHP_EOL) .PHP_EOL.implode(PHP_EOL, array_reverse($this->footer)); } return $result; } /** * Parse the tokens from the template. * * @param array $token * @return string */ protected function parseToken($token) { list($id, $content) = $token; if ($id == T_INLINE_HTML) { foreach ($this->compilers as $type) { $content = $this->{"compile{$type}"}($content); } } return $content; } /** * Execute the user defined extensions. * * @param string $value * @return string */ protected function compileExtensions($value) { foreach ($this->extensions as $compiler) { $value = call_user_func($compiler, $value, $this); } return $value; } /** * Compile Blade comments into valid PHP. * * @param string $value * @return string */ protected function compileComments($value) { $pattern = sprintf('/%s--((.|\s)*?)--%s/', $this->contentTags[0], $this->contentTags[1]); return preg_replace($pattern, '<?php /*$1*/ ?>', $value); } /** * Compile Blade echos into valid PHP. * * @param string $value * @return string */ protected function compileEchos($value) { $difference = strlen($this->contentTags[0]) - strlen($this->escapedTags[0]); if ($difference > 0) { return $this->compileEscapedEchos($this->compileRegularEchos($value)); } return $this->compileRegularEchos($this->compileEscapedEchos($value)); } /** * Compile Blade Statements that start with "@" * * @param string $value * @return mixed */ protected function compileStatements($value) { $callback = function($match) { if (method_exists($this, $method = 'compile'.ucfirst($match[1]))) { $match[0] = $this->$method(array_get($match, 3)); } return isset($match[3]) ? $match[0] : $match[0].$match[2]; }; return preg_replace_callback('/\B@(\w+)([ \t]*)(\( ( (?>[^()]+) | (?3) )* \))?/x', $callback, $value); } /** * Compile the "regular" echo statements. * * @param string $value * @return string */ protected function compileRegularEchos($value) { $pattern = sprintf('/(@)?%s\s*(.+?)\s*%s(\r?\n)?/s', $this->contentTags[0], $this->contentTags[1]); $callback = function($matches) { $whitespace = empty($matches[3]) ? '' : $matches[3].$matches[3]; return $matches[1] ? substr($matches[0], 1) : '<?php echo '.$this->compileEchoDefaults($matches[2]).'; ?>'.$whitespace; }; return preg_replace_callback($pattern, $callback, $value); } /** * Compile the escaped echo statements. * * @param string $value * @return string */ protected function compileEscapedEchos($value) { $pattern = sprintf('/%s\s*(.+?)\s*%s(\r?\n)?/s', $this->escapedTags[0], $this->escapedTags[1]); $callback = function($matches) { $whitespace = empty($matches[2]) ? '' : $matches[2].$matches[2]; return '<?php echo e('.$this->compileEchoDefaults($matches[1]).'); ?>'.$whitespace; }; return preg_replace_callback($pattern, $callback, $value); } /** * Compile the default values for the echo statement. * * @param string $value * @return string */ public function compileEchoDefaults($value) { return preg_replace('/^(?=\$)(.+?)(?:\s+or\s+)(.+?)$/s', 'isset($1) ? $1 : $2', $value); } /** * Compile the each statements into valid PHP. * * @param string $expression * @return string */ protected function compileEach($expression) { return "<?php echo \$__env->renderEach{$expression}; ?>"; } /** * Compile the yield statements into valid PHP. * * @param string $expression * @return string */ protected function compileYield($expression) { return "<?php echo \$__env->yieldContent{$expression}; ?>"; } /** * Compile the show statements into valid PHP. * * @param string $expression * @return string */ protected function compileShow($expression) { return "<?php echo \$__env->yieldSection(); ?>"; } /** * Compile the section statements into valid PHP. * * @param string $expression * @return string */ protected function compileSection($expression) { return "<?php \$__env->startSection{$expression}; ?>"; } /** * Compile the append statements into valid PHP. * * @param string $expression * @return string */ protected function compileAppend($expression) { return "<?php \$__env->appendSection(); ?>"; } /** * Compile the end-section statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndsection($expression) { return "<?php \$__env->stopSection(); ?>"; } /** * Compile the stop statements into valid PHP. * * @param string $expression * @return string */ protected function compileStop($expression) { return "<?php \$__env->stopSection(); ?>"; } /** * Compile the overwrite statements into valid PHP. * * @param string $expression * @return string */ protected function compileOverwrite($expression) { return "<?php \$__env->stopSection(true); ?>"; } /** * Compile the unless statements into valid PHP. * * @param string $expression * @return string */ protected function compileUnless($expression) { return "<?php if ( ! $expression): ?>"; } /** * Compile the end unless statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndunless($expression) { return "<?php endif; ?>"; } /** * Compile the lang statements into valid PHP. * * @param string $expression * @return string */ protected function compileLang($expression) { return "<?php echo \\Illuminate\\Support\\Facades\\Lang::get$expression; ?>"; } /** * Compile the choice statements into valid PHP. * * @param string $expression * @return string */ protected function compileChoice($expression) { return "<?php echo \\Illuminate\\Support\\Facades\\Lang::choice$expression; ?>"; } /** * Compile the else statements into valid PHP. * * @param string $expression * @return string */ protected function compileElse($expression) { return "<?php else: ?>"; } /** * Compile the for statements into valid PHP. * * @param string $expression * @return string */ protected function compileFor($expression) { return "<?php for{$expression}: ?>"; } /** * Compile the foreach statements into valid PHP. * * @param string $expression * @return string */ protected function compileForeach($expression) { return "<?php foreach{$expression}: ?>"; } /** * Compile the forelse statements into valid PHP. * * @param string $expression * @return string */ protected function compileForelse($expression) { $empty = '$__empty_' . ++$this->forelseCounter; return "<?php {$empty} = true; foreach{$expression}: {$empty} = false; ?>"; } /** * Compile the if statements into valid PHP. * * @param string $expression * @return string */ protected function compileIf($expression) { return "<?php if{$expression}: ?>"; } /** * Compile the else-if statements into valid PHP. * * @param string $expression * @return string */ protected function compileElseif($expression) { return "<?php elseif{$expression}: ?>"; } /** * Compile the forelse statements into valid PHP. * * @param string $expression * @return string */ protected function compileEmpty($expression) { $empty = '$__empty_' . $this->forelseCounter--; return "<?php endforeach; if ({$empty}): ?>"; } /** * Compile the while statements into valid PHP. * * @param string $expression * @return string */ protected function compileWhile($expression) { return "<?php while{$expression}: ?>"; } /** * Compile the end-while statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndwhile($expression) { return "<?php endwhile; ?>"; } /** * Compile the end-for statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndfor($expression) { return "<?php endfor; ?>"; } /** * Compile the end-for-each statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndforeach($expression) { return "<?php endforeach; ?>"; } /** * Compile the end-if statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndif($expression) { return "<?php endif; ?>"; } /** * Compile the end-for-else statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndforelse($expression) { return "<?php endif; ?>"; } /** * Compile the extends statements into valid PHP. * * @param string $expression * @return string */ protected function compileExtends($expression) { if (starts_with($expression, '(')) { $expression = substr($expression, 1, -1); } $data = "<?php echo \$__env->make($expression, array_except(get_defined_vars(), array('__data', '__path')))->render(); ?>"; $this->footer[] = $data; return ''; } /** * Compile the include statements into valid PHP. * * @param string $expression * @return string */ protected function compileInclude($expression) { if (starts_with($expression, '(')) { $expression = substr($expression, 1, -1); } return "<?php echo \$__env->make($expression, array_except(get_defined_vars(), array('__data', '__path')))->render(); ?>"; } /** * Compile the stack statements into the content * * @param string $expression * @return string */ protected function compileStack($expression) { return "<?php echo \$__env->yieldContent{$expression}; ?>"; } /** * Compile the push statements into valid PHP. * * @param string $expression * @return string */ protected function compilePush($expression) { return "<?php \$__env->startSection{$expression}; ?>"; } /** * Compile the endpush statements into valid PHP. * * @param string $expression * @return string */ protected function compileEndpush($expression) { return "<?php \$__env->appendSection(); ?>"; } /** * Register a custom Blade compiler. * * @param \Closure $compiler * @return void */ public function extend(Closure $compiler) { $this->extensions[] = $compiler; } /** * Get the regular expression for a generic Blade function. * * @param string $function * @return string */ public function createMatcher($function) { return '/(?<!\w)(\s*)@'.$function.'(\s*\(.*\))/'; } /** * Get the regular expression for a generic Blade function. * * @param string $function * @return string */ public function createOpenMatcher($function) { return '/(?<!\w)(\s*)@'.$function.'(\s*\(.*)\)/'; } /** * Create a plain Blade matcher. * * @param string $function * @return string */ public function createPlainMatcher($function) { return '/(?<!\w)(\s*)@'.$function.'(\s*)/'; } /** * Sets the content tags used for the compiler. * * @param string $openTag * @param string $closeTag * @param bool $escaped * @return void */ public function setContentTags($openTag, $closeTag, $escaped = false) { $property = ($escaped === true) ? 'escapedTags' : 'contentTags'; $this->{$property} = array(preg_quote($openTag), preg_quote($closeTag)); } /** * Sets the escaped content tags used for the compiler. * * @param string $openTag * @param string $closeTag * @return void */ public function setEscapedContentTags($openTag, $closeTag) { $this->setContentTags($openTag, $closeTag, true); } /** * Gets the content tags used for the compiler. * * @return string */ public function getContentTags() { return $this->getTags(); } /** * Gets the escaped content tags used for the compiler. * * @return string */ public function getEscapedContentTags() { return $this->getTags(true); } /** * Gets the tags used for the compiler. * * @param bool $escaped * @return array */ protected function getTags($escaped = false) { $tags = $escaped ? $this->escapedTags : $this->contentTags; return array_map('stripcslashes', $tags); } }
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