View: style-engine.php
<?php
/**
* Style engine: Public functions
*
* This file contains a variety of public functions developers can use to interact with
* the Style Engine API.
*
* @package WordPress
* @subpackage StyleEngine
* @since 6.1.0
*/
/**
* Global public interface method to generate styles from a single style object,
* e.g. the value of a block's attributes.style object or the top level styles in theme.json.
*
* Example usage:
*
* $styles = wp_style_engine_get_styles(
* array(
* 'color' => array( 'text' => '#cccccc' ),
* )
* );
*
* Returns:
*
* array(
* 'css' => 'color: #cccccc',
* 'declarations' => array( 'color' => '#cccccc' ),
* 'classnames' => 'has-color',
* )
*
* @since 6.1.0
*
* @see https://developer.wordpress.org/block-editor/reference-guides/theme-json-reference/theme-json-living/#styles
* @see https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/
*
* @param array $block_styles The style object.
* @param array $options {
* Optional. An array of options. Default empty array.
*
* @type string|null $context An identifier describing the origin of the style object,
* e.g. 'block-supports' or 'global-styles'. Default null.
* When set, the style engine will attempt to store the CSS rules,
* where a selector is also passed.
* @type bool $convert_vars_to_classnames Whether to skip converting incoming CSS var patterns,
* e.g. `var:preset|<PRESET_TYPE>|<PRESET_SLUG>`,
* to `var( --wp--preset--* )` values. Default false.
* @type string $selector Optional. When a selector is passed,
* the value of `$css` in the return value will comprise
* a full CSS rule `$selector { ...$css_declarations }`,
* otherwise, the value will be a concatenated string
* of CSS declarations.
* }
* @return array {
* @type string $css A CSS ruleset or declarations block
* formatted to be placed in an HTML `style` attribute or tag.
* @type string[] $declarations An associative array of CSS definitions,
* e.g. `array( "$property" => "$value", "$property" => "$value" )`.
* @type string $classnames Classnames separated by a space.
* }
*/
function wp_style_engine_get_styles( $block_styles, $options = array() ) {
$options = wp_parse_args(
$options,
array(
'selector' => null,
'context' => null,
'convert_vars_to_classnames' => false,
)
);
$parsed_styles = WP_Style_Engine::parse_block_styles( $block_styles, $options );
// Output.
$styles_output = array();
if ( ! empty( $parsed_styles['declarations'] ) ) {
$styles_output['css'] = WP_Style_Engine::compile_css( $parsed_styles['declarations'], $options['selector'] );
$styles_output['declarations'] = $parsed_styles['declarations'];
if ( ! empty( $options['context'] ) ) {
WP_Style_Engine::store_css_rule( $options['context'], $options['selector'], $parsed_styles['declarations'] );
}
}
if ( ! empty( $parsed_styles['classnames'] ) ) {
$styles_output['classnames'] = implode( ' ', array_unique( $parsed_styles['classnames'] ) );
}
return array_filter( $styles_output );
}
/**
* Returns compiled CSS from a collection of selectors and declarations.
* Useful for returning a compiled stylesheet from any collection of CSS selector + declarations.
*
* Example usage:
*
* $css_rules = array(
* array(
* 'selector' => '.elephant-are-cool',
* 'declarations' => array(
* 'color' => 'gray',
* 'width' => '3em',
* ),
* ),
* );
*
* $css = wp_style_engine_get_stylesheet_from_css_rules( $css_rules );
*
* Returns:
*
* .elephant-are-cool{color:gray;width:3em}
*
* @since 6.1.0
* @since 6.6.0 Added support for `$rules_group` in the `$css_rules` array.
*
* @param array $css_rules {
* Required. A collection of CSS rules.
*
* @type array ...$0 {
* @type string $rules_group A parent CSS selector in the case of nested CSS,
* or a CSS nested @rule, such as `@media (min-width: 80rem)` or `@layer module`.
* @type string $selector A CSS selector.
* @type string[] $declarations An associative array of CSS definitions,
* e.g. `array( "$property" => "$value", "$property" => "$value" )`.
* }
* }
* @param array $options {
* Optional. An array of options. Default empty array.
*
* @type string|null $context An identifier describing the origin of the style object,
* e.g. 'block-supports' or 'global-styles'. Default 'block-supports'.
* When set, the style engine will attempt to store the CSS rules.
* @type bool $optimize Whether to optimize the CSS output, e.g. combine rules.
* Default false.
* @type bool $prettify Whether to add new lines and indents to output.
* Defaults to whether the `SCRIPT_DEBUG` constant is defined.
* }
* @return string A string of compiled CSS declarations, or empty string.
*/
function wp_style_engine_get_stylesheet_from_css_rules( $css_rules, $options = array() ) {
if ( empty( $css_rules ) ) {
return '';
}
$options = wp_parse_args(
$options,
array(
'context' => null,
)
);
$css_rule_objects = array();
foreach ( $css_rules as $css_rule ) {
if ( empty( $css_rule['selector'] ) || empty( $css_rule['declarations'] ) || ! is_array( $css_rule['declarations'] ) ) {
continue;
}
$rules_group = $css_rule['rules_group'] ?? null;
if ( ! empty( $options['context'] ) ) {
WP_Style_Engine::store_css_rule( $options['context'], $css_rule['selector'], $css_rule['declarations'], $rules_group );
}
$css_rule_objects[] = new WP_Style_Engine_CSS_Rule( $css_rule['selector'], $css_rule['declarations'], $rules_group );
}
if ( empty( $css_rule_objects ) ) {
return '';
}
return WP_Style_Engine::compile_stylesheet_from_css_rules( $css_rule_objects, $options );
}
/**
* Returns compiled CSS from a store, if found.
*
* @since 6.1.0
*
* @param string $context A valid context name, corresponding to an existing store key.
* @param array $options {
* Optional. An array of options. Default empty array.
*
* @type bool $optimize Whether to optimize the CSS output, e.g. combine rules.
* Default false.
* @type bool $prettify Whether to add new lines and indents to output.
* Defaults to whether the `SCRIPT_DEBUG` constant is defined.
* }
* @return string A compiled CSS string.
*/
function wp_style_engine_get_stylesheet_from_context( $context, $options = array() ) {
return WP_Style_Engine::compile_stylesheet_from_css_rules( WP_Style_Engine::get_store( $context )->get_all_rules(), $options );
}