86 lines
2.6 KiB
PHP
86 lines
2.6 KiB
PHP
<?php
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namespace Blog\Template;
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use Exception;
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class Twig {
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private $blocks = [];
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private $viewsPath;
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private $debugMode;
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public function __construct($viewsPath, $debugMode = false) {
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$this->viewsPath = rtrim($viewsPath, '/') . '/';
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$this->debugMode = $debugMode;
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}
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public function render($file, $data = []) {
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try {
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$code = $this->includeFiles($file);
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$code = $this->compileCode($code);
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extract($data, EXTR_SKIP);
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ob_start();
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eval('?>' . $code);
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return ob_get_clean();
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} catch(Exception $e) {
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if($this->debugMode)
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echo "Error rendering template: " . $e->getMessage();
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throw $e;
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}
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}
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private function compileCode($code) {
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$code = $this->compileBlock($code);
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$code = $this->compileYield($code);
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$code = $this->compileEchos($code);
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$code = $this->compilePHP($code);
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return $code;
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}
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private function includeFiles($file) {
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$filePath = $this->viewsPath . preg_replace("/\.twig$/", "", $file) . ".twig";
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if(!file_exists($filePath))
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throw new Exception("View file not found: {$filePath}");
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$code = file_get_contents($filePath);
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preg_match_all('/{% ?(extends|include) ?\'?(.*?)\'? ?%}/i', $code, $matches, PREG_SET_ORDER);
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foreach($matches as $match) {
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$includedCode = $this->includeFiles($match[2]);
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$code = str_replace($match[0], $includedCode, $code);
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}
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return preg_replace('/{% ?(extends|include) ?\'?(.*?)\'? ?%}/i', '', $code);
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}
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private function compilePHP($code) {
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return preg_replace('~\{%\s*(.+?)\s*%}~is', '<?php $1 ?>', $code);
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}
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private function compileEchos($code) {
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$code = preg_replace('~\{\{\s*(.+?)\s*\}\}~is', '<?=$1?>', $code);
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return preg_replace('~\{\{\{\s*(.+?)\s*\}\}\}~is', '<?=htmlspecialchars($1, ENT_QUOTES, "UTF-8")?>', $code);
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}
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private function compileEscapedEchos($code) {
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return preg_replace('~\{{{\s*(.+?)\s*}}}~is', '<?=htmlentities($1, ENT_QUOTES, "UTF-8")?>', $code);
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}
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private function compileBlock($code) {
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preg_match_all('/{% ?block ?(.*?) ?%}(.*?){% ?endblock ?%}/is', $code, $matches, PREG_SET_ORDER);
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foreach($matches as $match) {
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if(!isset($this->blocks[$match[1]]))
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$this->blocks[$match[1]] = '';
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$this->blocks[$match[1]] = str_replace('@parent', $this->blocks[$match[1]], $match[2]);
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$code = str_replace($match[0], '', $code);
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}
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return $code;
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}
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private function compileYield($code) {
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foreach($this->blocks as $block => $value)
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$code = preg_replace('/{% ?yield ?' . $block . ' ?%}/', $value, $code);
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return preg_replace('/{% ?yield ?(.*?) ?%}/i', '', $code);
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}
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}
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