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1 <?php
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2
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3 namespace Drupal\Core\Theme;
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4
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5 use Drupal\Component\Render\MarkupInterface;
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6 use Drupal\Core\Render\Markup;
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7 use Drupal\Core\Routing\RouteMatchInterface;
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8 use Drupal\Core\Routing\StackedRouteMatchInterface;
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9 use Drupal\Core\Extension\ModuleHandlerInterface;
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10 use Drupal\Core\Template\Attribute;
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11
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12 /**
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13 * Provides the default implementation of a theme manager.
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14 */
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15 class ThemeManager implements ThemeManagerInterface {
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16
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17 /**
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18 * The theme negotiator.
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19 *
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20 * @var \Drupal\Core\Theme\ThemeNegotiatorInterface
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21 */
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22 protected $themeNegotiator;
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23
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24 /**
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25 * The theme registry used to render an output.
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26 *
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27 * @var \Drupal\Core\Theme\Registry
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28 */
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29 protected $themeRegistry;
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30
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31 /**
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32 * Contains the current active theme.
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33 *
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34 * @var \Drupal\Core\Theme\ActiveTheme
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35 */
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36 protected $activeTheme;
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37
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38 /**
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39 * The theme initialization.
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40 *
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41 * @var \Drupal\Core\Theme\ThemeInitializationInterface
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42 */
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43 protected $themeInitialization;
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44
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45 /**
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46 * The module handler.
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47 *
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48 * @var \Drupal\Core\Extension\ModuleHandlerInterface
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49 */
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50 protected $moduleHandler;
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51
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52 /**
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53 * The app root.
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54 *
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55 * @var string
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56 */
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57 protected $root;
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58
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59 /**
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60 * Constructs a new ThemeManager object.
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61 *
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62 * @param string $root
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63 * The app root.
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64 * @param \Drupal\Core\Theme\ThemeNegotiatorInterface $theme_negotiator
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65 * The theme negotiator.
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66 * @param \Drupal\Core\Theme\ThemeInitializationInterface $theme_initialization
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67 * The theme initialization.
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68 * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
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69 * The module handler.
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70 */
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71 public function __construct($root, ThemeNegotiatorInterface $theme_negotiator, ThemeInitializationInterface $theme_initialization, ModuleHandlerInterface $module_handler) {
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72 $this->root = $root;
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73 $this->themeNegotiator = $theme_negotiator;
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74 $this->themeInitialization = $theme_initialization;
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75 $this->moduleHandler = $module_handler;
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76 }
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77
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78 /**
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79 * Sets the theme registry.
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80 *
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81 * @param \Drupal\Core\Theme\Registry $theme_registry
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82 * The theme registry.
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83 *
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84 * @return $this
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85 */
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86 public function setThemeRegistry(Registry $theme_registry) {
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87 $this->themeRegistry = $theme_registry;
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88 return $this;
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89 }
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90
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91 /**
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92 * {@inheritdoc}
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93 */
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94 public function getActiveTheme(RouteMatchInterface $route_match = NULL) {
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95 if (!isset($this->activeTheme)) {
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96 $this->initTheme($route_match);
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97 }
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98 return $this->activeTheme;
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99 }
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100
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101 /**
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102 * {@inheritdoc}
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103 */
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104 public function hasActiveTheme() {
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105 return isset($this->activeTheme);
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106 }
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107
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108 /**
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109 * {@inheritdoc}
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110 */
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111 public function resetActiveTheme() {
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112 $this->activeTheme = NULL;
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113 return $this;
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114 }
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115
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116 /**
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117 * {@inheritdoc}
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118 */
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119 public function setActiveTheme(ActiveTheme $active_theme) {
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120 $this->activeTheme = $active_theme;
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121 if ($active_theme) {
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122 $this->themeInitialization->loadActiveTheme($active_theme);
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123 }
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124 return $this;
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125 }
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126
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127 /**
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128 * {@inheritdoc}
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129 */
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130 public function render($hook, array $variables) {
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131 static $default_attributes;
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132
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133 $active_theme = $this->getActiveTheme();
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134
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135 // If called before all modules are loaded, we do not necessarily have a
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136 // full theme registry to work with, and therefore cannot process the theme
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137 // request properly. See also \Drupal\Core\Theme\Registry::get().
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138 if (!$this->moduleHandler->isLoaded() && !defined('MAINTENANCE_MODE')) {
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139 throw new \Exception('The theme implementations may not be rendered until all modules are loaded.');
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140 }
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141
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142 $theme_registry = $this->themeRegistry->getRuntime();
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143
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144 // If an array of hook candidates were passed, use the first one that has an
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145 // implementation.
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146 if (is_array($hook)) {
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147 foreach ($hook as $candidate) {
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148 if ($theme_registry->has($candidate)) {
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149 break;
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150 }
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151 }
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152 $hook = $candidate;
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153 }
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154 // Save the original theme hook, so it can be supplied to theme variable
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155 // preprocess callbacks.
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156 $original_hook = $hook;
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157
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158 // If there's no implementation, check for more generic fallbacks.
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159 // If there's still no implementation, log an error and return an empty
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160 // string.
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161 if (!$theme_registry->has($hook)) {
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162 // Iteratively strip everything after the last '__' delimiter, until an
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163 // implementation is found.
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164 while ($pos = strrpos($hook, '__')) {
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165 $hook = substr($hook, 0, $pos);
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166 if ($theme_registry->has($hook)) {
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167 break;
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168 }
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169 }
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170 if (!$theme_registry->has($hook)) {
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171 // Only log a message when not trying theme suggestions ($hook being an
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172 // array).
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173 if (!isset($candidate)) {
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174 \Drupal::logger('theme')->warning('Theme hook %hook not found.', ['%hook' => $hook]);
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175 }
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176 // There is no theme implementation for the hook passed. Return FALSE so
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177 // the function calling
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178 // \Drupal\Core\Theme\ThemeManagerInterface::render() can differentiate
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179 // between a hook that exists and renders an empty string, and a hook
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180 // that is not implemented.
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181 return FALSE;
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182 }
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183 }
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184
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185 $info = $theme_registry->get($hook);
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186
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187 // If a renderable array is passed as $variables, then set $variables to
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188 // the arguments expected by the theme function.
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189 if (isset($variables['#theme']) || isset($variables['#theme_wrappers'])) {
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190 $element = $variables;
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191 $variables = [];
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192 if (isset($info['variables'])) {
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193 foreach (array_keys($info['variables']) as $name) {
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194 if (isset($element["#$name"]) || array_key_exists("#$name", $element)) {
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195 $variables[$name] = $element["#$name"];
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196 }
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197 }
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198 }
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199 else {
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200 $variables[$info['render element']] = $element;
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201 // Give a hint to render engines to prevent infinite recursion.
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202 $variables[$info['render element']]['#render_children'] = TRUE;
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203 }
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204 }
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205
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206 // Merge in argument defaults.
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207 if (!empty($info['variables'])) {
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208 $variables += $info['variables'];
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209 }
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210 elseif (!empty($info['render element'])) {
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211 $variables += [$info['render element'] => []];
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212 }
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213 // Supply original caller info.
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214 $variables += [
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215 'theme_hook_original' => $original_hook,
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216 ];
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217
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218 // Set base hook for later use. For example if '#theme' => 'node__article'
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219 // is called, we run hook_theme_suggestions_node_alter() rather than
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220 // hook_theme_suggestions_node__article_alter(), and also pass in the base
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221 // hook as the last parameter to the suggestions alter hooks.
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222 if (isset($info['base hook'])) {
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223 $base_theme_hook = $info['base hook'];
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224 }
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225 else {
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226 $base_theme_hook = $hook;
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227 }
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228
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229 // Invoke hook_theme_suggestions_HOOK().
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230 $suggestions = $this->moduleHandler->invokeAll('theme_suggestions_' . $base_theme_hook, [$variables]);
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231 // If the theme implementation was invoked with a direct theme suggestion
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232 // like '#theme' => 'node__article', add it to the suggestions array before
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233 // invoking suggestion alter hooks.
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234 if (isset($info['base hook'])) {
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235 $suggestions[] = $hook;
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236 }
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237
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238 // Invoke hook_theme_suggestions_alter() and
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239 // hook_theme_suggestions_HOOK_alter().
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240 $hooks = [
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241 'theme_suggestions',
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242 'theme_suggestions_' . $base_theme_hook,
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243 ];
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244 $this->moduleHandler->alter($hooks, $suggestions, $variables, $base_theme_hook);
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245 $this->alter($hooks, $suggestions, $variables, $base_theme_hook);
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246
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247 // Check if each suggestion exists in the theme registry, and if so,
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248 // use it instead of the base hook. For example, a function may use
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249 // '#theme' => 'node', but a module can add 'node__article' as a suggestion
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250 // via hook_theme_suggestions_HOOK_alter(), enabling a theme to have
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251 // an alternate template file for article nodes.
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252 foreach (array_reverse($suggestions) as $suggestion) {
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253 if ($theme_registry->has($suggestion)) {
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254 $info = $theme_registry->get($suggestion);
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255 break;
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256 }
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257 }
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258
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259 // Include a file if the theme function or variable preprocessor is held
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260 // elsewhere.
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261 if (!empty($info['includes'])) {
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262 foreach ($info['includes'] as $include_file) {
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263 include_once $this->root . '/' . $include_file;
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264 }
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265 }
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266
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267 // Invoke the variable preprocessors, if any.
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268 if (isset($info['base hook'])) {
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269 $base_hook = $info['base hook'];
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270 $base_hook_info = $theme_registry->get($base_hook);
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271 // Include files required by the base hook, since its variable
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272 // preprocessors might reside there.
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273 if (!empty($base_hook_info['includes'])) {
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274 foreach ($base_hook_info['includes'] as $include_file) {
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275 include_once $this->root . '/' . $include_file;
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276 }
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277 }
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278 if (isset($base_hook_info['preprocess functions'])) {
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279 // Set a variable for the 'theme_hook_suggestion'. This is used to
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280 // maintain backwards compatibility with template engines.
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281 $theme_hook_suggestion = $hook;
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282 }
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283 }
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284 if (isset($info['preprocess functions'])) {
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285 foreach ($info['preprocess functions'] as $preprocessor_function) {
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286 if (function_exists($preprocessor_function)) {
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287 $preprocessor_function($variables, $hook, $info);
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288 }
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289 }
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290 // Allow theme preprocess functions to set $variables['#attached'] and
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291 // $variables['#cache'] and use them like the corresponding element
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292 // properties on render arrays. In Drupal 8, this is the (only) officially
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293 // supported method of attaching bubbleable metadata from preprocess
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294 // functions. Assets attached here should be associated with the template
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295 // that we are preprocessing variables for.
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296 $preprocess_bubbleable = [];
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297 foreach (['#attached', '#cache'] as $key) {
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298 if (isset($variables[$key])) {
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299 $preprocess_bubbleable[$key] = $variables[$key];
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300 }
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301 }
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302 // We do not allow preprocess functions to define cacheable elements.
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303 unset($preprocess_bubbleable['#cache']['keys']);
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304 if ($preprocess_bubbleable) {
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305 // @todo Inject the Renderer in https://www.drupal.org/node/2529438.
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306 \Drupal::service('renderer')->render($preprocess_bubbleable);
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307 }
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308 }
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309
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310 // Generate the output using either a function or a template.
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311 $output = '';
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312 if (isset($info['function'])) {
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313 if (function_exists($info['function'])) {
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314 // Theme functions do not render via the theme engine, so the output is
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315 // not autoescaped. However, we can only presume that the theme function
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316 // has been written correctly and that the markup is safe.
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317 $output = Markup::create($info['function']($variables));
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318 }
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319 }
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320 else {
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321 $render_function = 'twig_render_template';
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322 $extension = '.html.twig';
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323
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324 // The theme engine may use a different extension and a different
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325 // renderer.
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326 $theme_engine = $active_theme->getEngine();
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327 if (isset($theme_engine)) {
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328 if ($info['type'] != 'module') {
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329 if (function_exists($theme_engine . '_render_template')) {
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330 $render_function = $theme_engine . '_render_template';
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331 }
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332 $extension_function = $theme_engine . '_extension';
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333 if (function_exists($extension_function)) {
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334 $extension = $extension_function();
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335 }
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336 }
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337 }
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338
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339 // In some cases, a template implementation may not have had
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340 // template_preprocess() run (for example, if the default implementation
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341 // is a function, but a template overrides that default implementation).
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342 // In these cases, a template should still be able to expect to have
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343 // access to the variables provided by template_preprocess(), so we add
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344 // them here if they don't already exist. We don't want the overhead of
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345 // running template_preprocess() twice, so we use the 'directory' variable
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346 // to determine if it has already run, which while not completely
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347 // intuitive, is reasonably safe, and allows us to save on the overhead of
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348 // adding some new variable to track that.
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349 if (!isset($variables['directory'])) {
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350 $default_template_variables = [];
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351 template_preprocess($default_template_variables, $hook, $info);
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352 $variables += $default_template_variables;
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353 }
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354 if (!isset($default_attributes)) {
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355 $default_attributes = new Attribute();
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356 }
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357 foreach (['attributes', 'title_attributes', 'content_attributes'] as $key) {
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358 if (isset($variables[$key]) && !($variables[$key] instanceof Attribute)) {
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359 if ($variables[$key]) {
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360 $variables[$key] = new Attribute($variables[$key]);
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361 }
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362 else {
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363 // Create empty attributes.
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364 $variables[$key] = clone $default_attributes;
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365 }
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366 }
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367 }
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368
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369 // Render the output using the template file.
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370 $template_file = $info['template'] . $extension;
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371 if (isset($info['path'])) {
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372 $template_file = $info['path'] . '/' . $template_file;
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373 }
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374 // Add the theme suggestions to the variables array just before rendering
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375 // the template for backwards compatibility with template engines.
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376 $variables['theme_hook_suggestions'] = $suggestions;
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377 // For backwards compatibility, pass 'theme_hook_suggestion' on to the
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378 // template engine. This is only set when calling a direct suggestion like
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379 // '#theme' => 'menu__shortcut_default' when the template exists in the
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380 // current theme.
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381 if (isset($theme_hook_suggestion)) {
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382 $variables['theme_hook_suggestion'] = $theme_hook_suggestion;
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383 }
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384 $output = $render_function($template_file, $variables);
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385 }
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386
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387 return ($output instanceof MarkupInterface) ? $output : (string) $output;
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388 }
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389
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390 /**
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391 * Initializes the active theme for a given route match.
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392 *
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393 * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
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394 * The current route match.
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395 */
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396 protected function initTheme(RouteMatchInterface $route_match = NULL) {
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397 // Determine the active theme for the theme negotiator service. This includes
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398 // the default theme as well as really specific ones like the ajax base theme.
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399 if (!$route_match) {
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400 $route_match = \Drupal::routeMatch();
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401 }
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402 if ($route_match instanceof StackedRouteMatchInterface) {
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403 $route_match = $route_match->getMasterRouteMatch();
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404 }
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405 $theme = $this->themeNegotiator->determineActiveTheme($route_match);
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406 $this->activeTheme = $this->themeInitialization->initTheme($theme);
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407 }
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408
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409 /**
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410 * {@inheritdoc}
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411 *
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412 * @todo Should we cache some of these information?
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413 */
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414 public function alterForTheme(ActiveTheme $theme, $type, &$data, &$context1 = NULL, &$context2 = NULL) {
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415 // Most of the time, $type is passed as a string, so for performance,
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416 // normalize it to that. When passed as an array, usually the first item in
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417 // the array is a generic type, and additional items in the array are more
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418 // specific variants of it, as in the case of array('form', 'form_FORM_ID').
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419 if (is_array($type)) {
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420 $extra_types = $type;
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421 $type = array_shift($extra_types);
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422 // Allow if statements in this function to use the faster isset() rather
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423 // than !empty() both when $type is passed as a string, or as an array with
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424 // one item.
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425 if (empty($extra_types)) {
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426 unset($extra_types);
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427 }
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428 }
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429
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430 $theme_keys = array_keys($theme->getBaseThemeExtensions());
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431 $theme_keys[] = $theme->getName();
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432 $functions = [];
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433 foreach ($theme_keys as $theme_key) {
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434 $function = $theme_key . '_' . $type . '_alter';
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435 if (function_exists($function)) {
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436 $functions[] = $function;
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437 }
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438 if (isset($extra_types)) {
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439 foreach ($extra_types as $extra_type) {
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440 $function = $theme_key . '_' . $extra_type . '_alter';
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441 if (function_exists($function)) {
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442 $functions[] = $function;
|
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443 }
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444 }
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445 }
|
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446 }
|
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447
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448 foreach ($functions as $function) {
|
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449 $function($data, $context1, $context2);
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450 }
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451 }
|
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452
|
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453 /**
|
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454 * {@inheritdoc}
|
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455 */
|
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456 public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL) {
|
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457 $theme = $this->getActiveTheme();
|
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458 $this->alterForTheme($theme, $type, $data, $context1, $context2);
|
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459 }
|
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460
|
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461 }
|