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<?php |
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|
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namespace Elementor\Modules\AtomicWidgets\CssConverter; |
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|
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use Elementor\Modules\AtomicWidgets\CssConverter\Metrics\Conversion_Failure_Reporter; |
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use Elementor\Modules\AtomicWidgets\Parsers\Props_Parser; |
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use Elementor\Modules\AtomicWidgets\Styles\Style_Schema; |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; // Exit if accessed directly. |
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} |
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|
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class Css_Converter { |
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|
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use Css_Block_Scanner_Trait; |
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|
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const BLOCKED_PROPERTIES = [ 'behavior', '-moz-binding' ]; |
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const BLOCKED_VALUE_NEEDLES = [ 'expression(', 'javascript:' ]; |
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|
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private Converter_Registry $registry; |
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|
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private Conversion_Failure_Reporter $failure_reporter; |
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|
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private Expander_Registry $expanders; |
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|
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private ?Variable_Prop_Value_Transformer $variable_transformer; |
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|
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public function __construct( |
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Converter_Registry $registry, |
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Conversion_Failure_Reporter $failure_reporter, |
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?Expander_Registry $expanders = null, |
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?Variable_Prop_Value_Transformer $variable_transformer = null |
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) { |
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$this->registry = $registry; |
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$this->failure_reporter = $failure_reporter; |
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$this->expanders = $expanders ?? new Expander_Registry(); |
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$this->variable_transformer = $variable_transformer; |
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} |
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|
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/** |
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* @return array{blocks: array<int, array{selector: string|null, css: string}>}|array{blocks: array, error: string} |
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*/ |
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public function parse_nested( string $css ): array { |
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$result = $this->scan_ampersand_blocks( $css ); |
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|
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if ( isset( $result['error'] ) ) { |
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return [ |
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'blocks' => [], |
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'error' => $result['error'], |
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]; |
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} |
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|
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return [ |
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'blocks' => array_merge( |
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[ |
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[ |
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'selector' => null, |
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'css' => $result['base_css'], |
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], |
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], |
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$result['nested_blocks'] |
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), |
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]; |
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} |
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|
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private function scan_ampersand_blocks( string $css ): array { |
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$nested_blocks = []; |
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$base_css = ''; |
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$len = strlen( $css ); |
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$i = 0; |
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$segment_start = 0; |
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$in_string = false; |
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$string_char = ''; |
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|
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while ( $i < $len ) { |
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$char = $css[ $i ]; |
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|
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if ( $in_string ) { |
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if ( $string_char === $char && ! $this->is_escaped( $css, $i ) ) { |
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$in_string = false; |
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} |
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++$i; |
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continue; |
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} |
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|
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if ( '"' === $char || "'" === $char ) { |
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$in_string = true; |
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$string_char = $char; |
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++$i; |
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continue; |
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} |
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|
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if ( '{' === $char ) { |
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return [ 'error' => 'Unsupported nested selector. Only &:hover, &:focus, and &:active pseudo-class blocks are allowed.' ]; |
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} |
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|
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if ( '}' === $char ) { |
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return [ 'error' => 'Unclosed brace detected in CSS input.' ]; |
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} |
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|
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if ( '&' !== $char ) { |
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++$i; |
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continue; |
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} |
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|
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$j = $i + 1; |
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while ( $j < $len && '{' !== $css[ $j ] && ';' !== $css[ $j ] && '}' !== $css[ $j ] ) { |
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++$j; |
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} |
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|
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if ( $j >= $len || ';' === $css[ $j ] || '}' === $css[ $j ] ) { |
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++$i; |
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continue; |
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} |
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|
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$selector = rtrim( substr( $css, $i + 1, $j - $i - 1 ) ); |
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|
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if ( '' === $selector ) { |
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return [ 'error' => 'Bare & block without a selector is not valid CSS.' ]; |
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} |
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|
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$block_end = $this->find_block_end( $css, $j + 1, $len ); |
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|
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if ( null === $block_end ) { |
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return [ 'error' => 'Unclosed brace detected in CSS input.' ]; |
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} |
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|
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$block_content = substr( $css, $j + 1, $block_end - $j - 2 ); |
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$base_css .= substr( $css, $segment_start, $i - $segment_start ); |
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$segment_start = $block_end; |
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|
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$nested_blocks[] = [ |
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'selector' => $selector, |
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'css' => $block_content, |
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]; |
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|
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$i = $block_end; |
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} |
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|
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$base_css .= substr( $css, $segment_start ); |
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|
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return [ |
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'base_css' => $base_css, |
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'nested_blocks' => $nested_blocks, |
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]; |
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} |
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|
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/** |
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* @return array{props: array, customCss: string, rejected: string[]} |
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*/ |
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public function convert( string $css ): array { |
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$rules = $this->dedupe( $this->expand_shorthands( $this->parse( $css ) ) ); |
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$context = new Conversion_Context( $rules ); |
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$leftover = []; |
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|
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foreach ( $rules as $rule ) { |
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if ( ! $this->try_convert( $context, $rule ) ) { |
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$leftover[] = $rule['declaration'] . ';'; |
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} |
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} |
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|
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$props = $context->get_props(); |
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$rejected = $context->get_rejected(); |
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|
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if ( $this->variable_transformer ) { |
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$schema = $this->style_schema(); |
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$props = $this->variable_transformer->transform( $props, $schema ); |
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|
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$ejected = $this->variable_transformer->eject_unresolved_var_props( $props, $schema, $rules ); |
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$props = $ejected['props']; |
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$leftover = array_merge( $leftover, $ejected['custom_css'] ); |
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$rejected = array_merge( $rejected, $ejected['rejected'] ); |
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|
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// Post-processing: handle edge cases that the general transform pipeline cannot cover. |
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$gradient_color_stops_leftovers = $this->variable_transformer->normalize_gradient_color_stops( $props, $rules ); |
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$leftover = array_merge( $leftover, $gradient_color_stops_leftovers ); |
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|
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$props = $this->validate_props( $props, $schema ); |
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} |
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|
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$props = $this->cleanup_props( $props ); |
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|
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return [ |
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'props' => $props, |
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'customCss' => implode( ' ', $leftover ), |
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'rejected' => $rejected, |
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]; |
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} |
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|
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private function validate_props( array $props, array $schema ): array { |
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if ( empty( $props ) ) { |
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return []; |
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} |
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|
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$null_resets = array_filter( $props, fn( $v ) => null === $v || $this->has_null_leaf( $v ) ); |
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$value_props = array_filter( $props, fn( $v ) => null !== $v && ! $this->has_null_leaf( $v ) ); |
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|
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$validated = empty( $value_props ) |
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? [] |
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: Props_Parser::make( $schema )->validate( $value_props )->unwrap(); |
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|
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return array_merge( $validated, $null_resets ); |
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} |
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|
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private function has_null_leaf( $value ): bool { |
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if ( ! is_array( $value ) || ! is_array( $value['value'] ?? null ) ) { |
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return false; |
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} |
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|
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foreach ( $value['value'] as $v ) { |
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if ( null === $v || $this->has_null_leaf( $v ) ) { |
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return true; |
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} |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Recursively collapses prop values where all present sub-values are null or empty arrays into a |
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* single null. This propagates null resets up the tree so the client receives a clean signal: |
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* e.g. a Dimensions object where every side was set to null becomes just null at the prop level. |
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*/ |
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private function cleanup_props( array $props ): array { |
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$result = []; |
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|
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foreach ( $props as $key => $value ) { |
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$result[ $key ] = $this->cleanup_value( $value ); |
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} |
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|
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return $result; |
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} |
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|
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private function cleanup_value( $value ) { |
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if ( null === $value || ! is_array( $value ) ) { |
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return $value; |
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} |
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|
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$inner = $value['value'] ?? $value; |
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|
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if ( ! is_array( $inner ) ) { |
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return $value; |
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} |
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|
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$cleaned = []; |
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|
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foreach ( $inner as $k => $v ) { |
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$cleaned[ $k ] = $this->cleanup_value( $v ); |
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} |
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|
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if ( $this->is_empty_or_all_null( $cleaned ) ) { |
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return null; |
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} |
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|
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return isset( $value['$$type'] ) |
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? [ |
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'$$type' => $value['$$type'], |
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'value' => $cleaned, |
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] |
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: $cleaned; |
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} |
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|
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private function is_empty_or_all_null( array $arr ): bool { |
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if ( empty( $arr ) ) { |
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return false; |
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} |
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|
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foreach ( $arr as $v ) { |
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if ( null !== $v ) { |
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return false; |
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} |
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} |
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|
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return true; |
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} |
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|
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private function style_schema(): array { |
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if ( function_exists( 'apply_filters' ) ) { |
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return Style_Schema::get(); |
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} |
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|
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return Style_Schema::get_style_schema(); |
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} |
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|
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/** |
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* Pre-processing pass: rewrite shorthands (e.g. `border`) into the longhand declarations the |
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* schema-bound converters understand, in place so the source cascade order is preserved. A rule |
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* with no matching expander, or whose expander declines (empty result) or throws, is kept as-is so |
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* it still reaches the converter loop (and custom_css fallback). |
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* |
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* @param array<int, array{property: string, value: string, declaration: string}> $rules |
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* @return array<int, array{property: string, value: string, declaration: string}> |
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*/ |
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private function dedupe( array $rules ): array { |
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$last_index = []; |
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|
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foreach ( $rules as $i => $rule ) { |
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$last_index[ $rule['property'] ] = $i; |
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} |
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|
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return array_values( |
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array_filter( $rules, fn( $rule, $i ) => $last_index[ $rule['property'] ] === $i, ARRAY_FILTER_USE_BOTH ) |
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); |
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} |
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|
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private function expand_shorthands( array $rules ): array { |
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$expanded = []; |
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|
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foreach ( $rules as $rule ) { |
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foreach ( $this->expand_rule( $rule ) as $result_rule ) { |
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$expanded[] = $result_rule; |
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} |
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} |
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|
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return $expanded; |
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} |
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|
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/** |
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* @param array{property: string, value: string, declaration: string} $rule |
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* @return array<int, array{property: string, value: string, declaration: string}> |
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*/ |
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private function expand_rule( array $rule ): array { |
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foreach ( $this->expanders->all() as $expander ) { |
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if ( ! $expander->is_supported( $rule ) ) { |
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continue; |
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} |
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|
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try { |
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$expanded = $expander->expand( $rule ); |
| 330 |
} catch ( \Throwable $error ) { |
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$this->failure_reporter->report( |
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$rule['property'], |
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Conversion_Failure_Reporter::CATEGORY_EXCEPTION, |
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[ 'message' => $error->getMessage() ] |
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); |
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|
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return [ $rule ]; |
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} |
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|
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return empty( $expanded ) ? [ $rule ] : $expanded; |
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} |
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|
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return [ $rule ]; |
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} |
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|
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/** |
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* Try-until-success: iterate converters in registration order; the first one that |
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* converts wins. A thrown error is treated as a decline and reported as a defect. |
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* |
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* @param Conversion_Context $context The shared mutable conversion context. |
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* @param array{property: string, value: string} $rule A single parsed CSS declaration. |
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*/ |
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private function try_convert( Conversion_Context $context, array $rule ): bool { |
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foreach ( $this->registry->all() as $converter ) { |
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if ( ! $converter->is_supported( $rule ) ) { |
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continue; |
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} |
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|
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try { |
| 360 |
if ( $converter->convert( $context, $rule ) ) { |
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return true; |
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} |
| 363 |
} catch ( \Throwable $error ) { |
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$this->failure_reporter->report( |
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$rule['property'], |
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Conversion_Failure_Reporter::CATEGORY_EXCEPTION, |
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[ 'message' => $error->getMessage() ] |
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); |
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} |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Naive top-level split on ';' (breaks on values containing ';'); acceptable for clean |
| 377 |
* LLM input. Splits each declaration on the first ':' so values keep colons (e.g. url()). |
| 378 |
* |
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* @return array<int, array{property: string, value: string}> |
| 380 |
*/ |
| 381 |
private function parse( string $css ): array { |
| 382 |
$rules = []; |
| 383 |
|
| 384 |
foreach ( explode( ';', $css ) as $declaration ) { |
| 385 |
$declaration = trim( $declaration ); |
| 386 |
|
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$separator = strpos( $declaration, ':' ); |
| 388 |
|
| 389 |
if ( false === $separator ) { |
| 390 |
continue; |
| 391 |
} |
| 392 |
|
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$property = strtolower( trim( substr( $declaration, 0, $separator ) ) ); |
| 394 |
$raw_value = trim( substr( $declaration, $separator + 1 ) ); |
| 395 |
|
| 396 |
if ( '' === $property || '' === $raw_value || $this->is_blocked( $property, $raw_value ) ) { |
| 397 |
continue; |
| 398 |
} |
| 399 |
|
| 400 |
$value = 'null' === $raw_value ? null : $raw_value; |
| 401 |
|
| 402 |
$rules[] = [ |
| 403 |
'property' => $property, |
| 404 |
'value' => $value, |
| 405 |
'declaration' => $declaration, |
| 406 |
]; |
| 407 |
} |
| 408 |
|
| 409 |
return $rules; |
| 410 |
} |
| 411 |
|
| 412 |
private function is_blocked( string $property, string $value ): bool { |
| 413 |
if ( in_array( $property, self::BLOCKED_PROPERTIES, true ) ) { |
| 414 |
return true; |
| 415 |
} |
| 416 |
|
| 417 |
$value = strtolower( $value ); |
| 418 |
|
| 419 |
foreach ( self::BLOCKED_VALUE_NEEDLES as $needle ) { |
| 420 |
if ( false !== strpos( $value, $needle ) ) { |
| 421 |
return true; |
| 422 |
} |
| 423 |
} |
| 424 |
|
| 425 |
return false; |
| 426 |
} |
| 427 |
} |
| 428 |
|
