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| 1 | <?php |
| 2 | declare( strict_types = 1 ); |
| 3 | |
| 4 | /** |
| 5 | * TemplateParser.php |
| 6 | * |
| 7 | * This file is part of the Codex design system, the official design system |
| 8 | * for Wikimedia projects. It provides the `TemplateParser` class, which is responsible |
| 9 | * for compiling and rendering Mustache templates with localization and helper support. |
| 10 | * |
| 11 | * The TemplateParser centralizes template compilation and rendering logic, |
| 12 | * enhancing reusability and maintainability. |
| 13 | * |
| 14 | * @category Parser |
| 15 | * @package Codex\Parser |
| 16 | * @since 0.3.0 |
| 17 | * @author Doğu Abaris <abaris@null.net> |
| 18 | * @license https://www.gnu.org/copyleft/gpl.html GPL-2.0-or-later |
| 19 | * @link https://doc.wikimedia.org/codex/main/ Codex Documentation |
| 20 | */ |
| 21 | |
| 22 | namespace Wikimedia\Codex\Parser; |
| 23 | |
| 24 | use LightnCandy\Flags; |
| 25 | use LightnCandy\LightnCandy; |
| 26 | use RuntimeException; |
| 27 | |
| 28 | /** |
| 29 | * TemplateParser is responsible for compiling and rendering Mustache templates. |
| 30 | * |
| 31 | * This class provides methods to compile Mustache templates into PHP rendering functions. |
| 32 | * |
| 33 | * @category Parser |
| 34 | * @package Codex\Parser |
| 35 | * @since 0.3.0 |
| 36 | * @author Doğu Abaris <abaris@null.net> |
| 37 | * @license https://www.gnu.org/copyleft/gpl.html GPL-2.0-or-later |
| 38 | * @link https://doc.wikimedia.org/codex/main/ Codex Documentation |
| 39 | */ |
| 40 | class TemplateParser { |
| 41 | |
| 42 | /** |
| 43 | * Path to the Mustache templates directory. |
| 44 | */ |
| 45 | private string $templateDir; |
| 46 | |
| 47 | /** |
| 48 | * @var array<string,callable> Array of cached rendering functions. |
| 49 | */ |
| 50 | private array $renderers = []; |
| 51 | |
| 52 | /** |
| 53 | * Compilation flags for LightnCandy. |
| 54 | */ |
| 55 | private int $compileFlags; |
| 56 | |
| 57 | /** |
| 58 | * Constructor to initialize the TemplateParser. |
| 59 | * |
| 60 | * @since 0.3.0 |
| 61 | * |
| 62 | * @param string $templateDir Path to the template directory. |
| 63 | */ |
| 64 | public function __construct( string $templateDir ) { |
| 65 | $this->templateDir = $templateDir; |
| 66 | |
| 67 | $this->compileFlags = |
| 68 | Flags::FLAG_ERROR_EXCEPTION | |
| 69 | Flags::FLAG_HANDLEBARS | |
| 70 | Flags::FLAG_ADVARNAME | |
| 71 | Flags::FLAG_RUNTIMEPARTIAL | |
| 72 | Flags::FLAG_RENDER_DEBUG | |
| 73 | Flags::FLAG_MUSTACHE | |
| 74 | Flags::FLAG_ERROR_EXCEPTION | |
| 75 | Flags::FLAG_NOHBHELPERS | |
| 76 | Flags::FLAG_MUSTACHELOOKUP; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Compiles the Mustache template into a PHP rendering function. |
| 81 | * |
| 82 | * @since 0.3.0 |
| 83 | * |
| 84 | * @param string $templateName Name of the template file (without extension). |
| 85 | * |
| 86 | * @return callable Render function for the template. |
| 87 | * @throws RuntimeException If the template file cannot be found or compilation fails. |
| 88 | * @suppress PhanTypeMismatchArgument |
| 89 | */ |
| 90 | public function compile( string $templateName ): callable { |
| 91 | if ( isset( $this->renderers[$templateName] ) ) { |
| 92 | return $this->renderers[$templateName]; |
| 93 | } |
| 94 | |
| 95 | $templatePath = "$this->templateDir/$templateName.mustache"; |
| 96 | |
| 97 | if ( !file_exists( $templatePath ) ) { |
| 98 | throw new RuntimeException( "Template file not found: $templatePath" ); |
| 99 | } |
| 100 | |
| 101 | $templateContent = file_get_contents( $templatePath ); |
| 102 | |
| 103 | if ( $templateContent === false ) { |
| 104 | throw new RuntimeException( "Unable to read template file: $templatePath" ); |
| 105 | } |
| 106 | |
| 107 | $phpCode = LightnCandy::compile( $templateContent, [ |
| 108 | 'flags' => $this->compileFlags, |
| 109 | 'basedir' => $this->templateDir, |
| 110 | 'fileext' => '.mustache', |
| 111 | 'partialresolver' => function ( $cx, $partialName ) use ( $templateName ) { |
| 112 | $filename = "$this->templateDir/$partialName.mustache"; |
| 113 | if ( !file_exists( $filename ) ) { |
| 114 | throw new RuntimeException( |
| 115 | sprintf( |
| 116 | 'Could not compile template `%s`: Could not find partial `%s` at %s', |
| 117 | $templateName, |
| 118 | $partialName, |
| 119 | $filename |
| 120 | ) |
| 121 | ); |
| 122 | } |
| 123 | |
| 124 | $fileContents = file_get_contents( $filename ); |
| 125 | |
| 126 | if ( $fileContents === false ) { |
| 127 | throw new RuntimeException( |
| 128 | sprintf( |
| 129 | 'Could not compile template `%s`: Could not find partial `%s` at %s', |
| 130 | $templateName, |
| 131 | $partialName, |
| 132 | $filename |
| 133 | ) |
| 134 | ); |
| 135 | } |
| 136 | |
| 137 | return $fileContents; |
| 138 | }, |
| 139 | ] ); |
| 140 | |
| 141 | if ( !$phpCode ) { |
| 142 | throw new RuntimeException( "Failed to compile template: $templateName" ); |
| 143 | } |
| 144 | |
| 145 | // phpcs:ignore MediaWiki.Usage.ForbiddenFunctions.eval |
| 146 | $renderFunction = eval( $phpCode ); |
| 147 | if ( !is_callable( $renderFunction ) ) { |
| 148 | throw new RuntimeException( "Compiled template is not callable: $templateName" ); |
| 149 | } |
| 150 | |
| 151 | $this->renderers[$templateName] = $renderFunction; |
| 152 | |
| 153 | return $renderFunction; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Processes the template with provided data and returns the rendered HTML. |
| 158 | * |
| 159 | * @since 0.3.0 |
| 160 | * |
| 161 | * @param string $templateName Name of the template file (without extension). |
| 162 | * @param array $data Data to render within the template. |
| 163 | * |
| 164 | * @return string Rendered HTML. |
| 165 | * @throws RuntimeException If rendering fails. |
| 166 | */ |
| 167 | public function processTemplate( string $templateName, array $data ): string { |
| 168 | $renderFunction = $this->compile( $templateName ); |
| 169 | |
| 170 | return $renderFunction( $data ); |
| 171 | } |
| 172 | } |