WP_Theme_JSON::convert_variables_to_value( array $styles, array $values ): array

Source

private static function convert_variables_to_value( $styles, $values ) {
	foreach ( $styles as $key => $style ) {
		if ( empty( $style ) ) {
			continue;
		}

		if ( is_array( $style ) ) {
			$styles[ $key ] = self::convert_variables_to_value( $style, $values );
			continue;
		}

		if ( 0 <= strpos( $style, 'var(' ) ) {
			// find all the variables in the string in the form of var(--variable-name, fallback), with fallback in the second capture group.

			$has_matches = preg_match_all( '/var\(([^),]+)?,?\s?(\S+)?\)/', $style, $var_parts );

			if ( $has_matches ) {
				$resolved_style = $styles[ $key ];
				foreach ( $var_parts[1] as $index => $var_part ) {
					$key_in_values   = 'var(' . $var_part . ')';
					$rule_to_replace = $var_parts[0][ $index ]; // the css rule to replace e.g. var(--wp--preset--color--vivid-green-cyan).
					$fallback        = $var_parts[2][ $index ]; // the fallback value.
					$resolved_style  = str_replace(
						array(
							$rule_to_replace,
							$fallback,
						),
						array(
							isset( $values[ $key_in_values ] ) ? $values[ $key_in_values ] : $rule_to_replace,
							isset( $values[ $fallback ] ) ? $values[ $fallback ] : $fallback,
						),
						$resolved_style
					);
				}
				$styles[ $key ] = $resolved_style;
			}
		}
	}

	return $styles;
}

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