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   1  <?php
   2  /**
   3   * WP_Theme_JSON_Schema class
   4   *
   5   * @package WordPress
   6   * @subpackage Theme
   7   * @since 5.9.0
   8   */
   9  
  10  /**
  11   * Class that migrates a given theme.json structure to the latest schema.
  12   *
  13   * This class is for internal core usage and is not supposed to be used by extenders (plugins and/or themes).
  14   * This is a low-level API that may need to do breaking changes. Please,
  15   * use get_global_settings, get_global_styles, and get_global_stylesheet instead.
  16   *
  17   * @since 5.9.0
  18   * @access private
  19   */
  20  #[AllowDynamicProperties]
  21  class WP_Theme_JSON_Schema {
  22  
  23      /**
  24       * Maps old properties to their new location within the schema's settings.
  25       * This will be applied at both the defaults and individual block levels.
  26       */
  27      const V1_TO_V2_RENAMED_PATHS = array(
  28          'border.customRadius'         => 'border.radius',
  29          'spacing.customMargin'        => 'spacing.margin',
  30          'spacing.customPadding'       => 'spacing.padding',
  31          'typography.customLineHeight' => 'typography.lineHeight',
  32      );
  33  
  34      /**
  35       * Function that migrates a given theme.json structure to the last version.
  36       *
  37       * @since 5.9.0
  38       * @since 6.6.0 Migrate up to v3 and add $origin parameter.
  39       *
  40       * @param array $theme_json The structure to migrate.
  41       * @param string $origin    Optional. What source of data this object represents.
  42       *                          One of 'blocks', 'default', 'theme', or 'custom'. Default 'theme'.
  43       * @return array The structure in the last version.
  44       */
  45  	public static function migrate( $theme_json, $origin = 'theme' ) {
  46          if ( ! isset( $theme_json['version'] ) ) {
  47              $theme_json = array(
  48                  'version' => WP_Theme_JSON::LATEST_SCHEMA,
  49              );
  50          }
  51  
  52          // Migrate each version in order starting with the current version.
  53          switch ( $theme_json['version'] ) {
  54              case 1:
  55                  $theme_json = self::migrate_v1_to_v2( $theme_json );
  56                  // Deliberate fall through. Once migrated to v2, also migrate to v3.
  57              case 2:
  58                  $theme_json = self::migrate_v2_to_v3( $theme_json, $origin );
  59          }
  60  
  61          return $theme_json;
  62      }
  63  
  64      /**
  65       * Removes the custom prefixes for a few properties
  66       * that were part of v1:
  67       *
  68       * 'border.customRadius'         => 'border.radius',
  69       * 'spacing.customMargin'        => 'spacing.margin',
  70       * 'spacing.customPadding'       => 'spacing.padding',
  71       * 'typography.customLineHeight' => 'typography.lineHeight',
  72       *
  73       * @since 5.9.0
  74       *
  75       * @param array $old Data to migrate.
  76       * @return array Data without the custom prefixes.
  77       */
  78  	private static function migrate_v1_to_v2( $old ) {
  79          // Copy everything.
  80          $new = $old;
  81  
  82          // Overwrite the things that changed.
  83          if ( isset( $old['settings'] ) ) {
  84              $new['settings'] = self::rename_paths( $old['settings'], self::V1_TO_V2_RENAMED_PATHS );
  85          }
  86  
  87          // Set the new version.
  88          $new['version'] = 2;
  89  
  90          return $new;
  91      }
  92  
  93      /**
  94       * Migrates from v2 to v3.
  95       *
  96       * - Sets settings.typography.defaultFontSizes to false if settings.typography.fontSizes are defined.
  97       * - Sets settings.spacing.defaultSpacingSizes to false if settings.spacing.spacingSizes are defined.
  98       * - Prevents settings.spacing.spacingSizes from merging with settings.spacing.spacingScale by
  99       *   unsetting spacingScale when spacingSizes are defined.
 100       *
 101       * @since 6.6.0
 102       *
 103       * @param array $old     Data to migrate.
 104       * @param string $origin What source of data this object represents.
 105       *                       One of 'blocks', 'default', 'theme', or 'custom'.
 106       * @return array Data with defaultFontSizes set to false.
 107       */
 108  	private static function migrate_v2_to_v3( $old, $origin ) {
 109          // Copy everything.
 110          $new = $old;
 111  
 112          // Set the new version.
 113          $new['version'] = 3;
 114  
 115          /*
 116           * Remaining changes do not need to be applied to the custom origin,
 117           * as they should take on the value of the theme origin.
 118           */
 119          if ( 'custom' === $origin ) {
 120              return $new;
 121          }
 122  
 123          /*
 124           * Even though defaultFontSizes and defaultSpacingSizes are new
 125           * settings, we need to migrate them as they each control
 126           * PRESETS_METADATA prevent_override values which were previously
 127           * hardcoded to false. This only needs to happen when the theme provides
 128           * fontSizes or spacingSizes as they could match the default ones and
 129           * affect the generated CSS.
 130           */
 131          if ( isset( $old['settings']['typography']['fontSizes'] ) ) {
 132              $new['settings']['typography']['defaultFontSizes'] = false;
 133          }
 134  
 135          /*
 136           * Similarly to defaultFontSizes, we need to migrate defaultSpacingSizes
 137           * as it controls the PRESETS_METADATA prevent_override which was
 138           * previously hardcoded to false. This only needs to happen when the
 139           * theme provided spacing sizes via spacingSizes or spacingScale.
 140           */
 141          if (
 142              isset( $old['settings']['spacing']['spacingSizes'] ) ||
 143              isset( $old['settings']['spacing']['spacingScale'] )
 144          ) {
 145              $new['settings']['spacing']['defaultSpacingSizes'] = false;
 146          }
 147  
 148          /*
 149           * In v3 spacingSizes is merged with the generated spacingScale sizes
 150           * instead of completely replacing them. The v3 behavior is what was
 151           * documented for the v2 schema, but the code never actually did work
 152           * that way. Instead of surprising users with a behavior change two
 153           * years after the fact at the same time as a v3 update is introduced,
 154           * we'll continue using the "bugged" behavior for v2 themes. And treat
 155           * the "bug fix" as a breaking change for v3.
 156           */
 157          if ( isset( $old['settings']['spacing']['spacingSizes'] ) ) {
 158              unset( $new['settings']['spacing']['spacingScale'] );
 159          }
 160  
 161          return $new;
 162      }
 163  
 164      /**
 165       * Processes the settings subtree.
 166       *
 167       * @since 5.9.0
 168       *
 169       * @param array $settings        Array to process.
 170       * @param array $paths_to_rename Paths to rename.
 171       * @return array The settings in the new format.
 172       */
 173  	private static function rename_paths( $settings, $paths_to_rename ) {
 174          $new_settings = $settings;
 175  
 176          // Process any renamed/moved paths within default settings.
 177          self::rename_settings( $new_settings, $paths_to_rename );
 178  
 179          // Process individual block settings.
 180          if ( isset( $new_settings['blocks'] ) && is_array( $new_settings['blocks'] ) ) {
 181              foreach ( $new_settings['blocks'] as &$block_settings ) {
 182                  self::rename_settings( $block_settings, $paths_to_rename );
 183              }
 184          }
 185  
 186          return $new_settings;
 187      }
 188  
 189      /**
 190       * Processes a settings array, renaming or moving properties.
 191       *
 192       * @since 5.9.0
 193       *
 194       * @param array $settings        Reference to settings either defaults or an individual block's.
 195       * @param array $paths_to_rename Paths to rename.
 196       */
 197  	private static function rename_settings( &$settings, $paths_to_rename ) {
 198          foreach ( $paths_to_rename as $original => $renamed ) {
 199              $original_path = explode( '.', $original );
 200              $renamed_path  = explode( '.', $renamed );
 201              $current_value = _wp_array_get( $settings, $original_path, null );
 202  
 203              if ( null !== $current_value ) {
 204                  _wp_array_set( $settings, $renamed_path, $current_value );
 205                  self::unset_setting_by_path( $settings, $original_path );
 206              }
 207          }
 208      }
 209  
 210      /**
 211       * Removes a property from within the provided settings by its path.
 212       *
 213       * @since 5.9.0
 214       *
 215       * @param array $settings Reference to the current settings array.
 216       * @param array $path Path to the property to be removed.
 217       */
 218  	private static function unset_setting_by_path( &$settings, $path ) {
 219          $tmp_settings = &$settings;
 220          $last_key     = array_pop( $path );
 221          foreach ( $path as $key ) {
 222              $tmp_settings = &$tmp_settings[ $key ];
 223          }
 224  
 225          unset( $tmp_settings[ $last_key ] );
 226      }
 227  }