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<?php /** * @package dompdf * @link https://github.com/dompdf/dompdf * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License */ namespace Dompdf\Css; use Dompdf\Adapter\CPDF; use Dompdf\Css\Content\Attr; use Dompdf\Css\Content\CloseQuote; use Dompdf\Css\Content\ContentPart; use Dompdf\Css\Content\Counter; use Dompdf\Css\Content\Counters; use Dompdf\Css\Content\NoCloseQuote; use Dompdf\Css\Content\NoOpenQuote; use Dompdf\Css\Content\OpenQuote; use Dompdf\Css\Content\StringPart; use Dompdf\Css\Content\Url; use Dompdf\Exception; use Dompdf\FontMetrics; use Dompdf\Frame; use Dompdf\Helpers; /** * Represents CSS properties. * * The Style class is responsible for handling and storing CSS properties. * It includes methods to resolve colors and lengths, as well as getters & * setters for many CSS properties. * * Access to the different CSS properties is provided by the methods * {@link Style::set_prop()} and {@link Style::get_specified()}, and the * property overload methods {@link Style::__set()} and {@link Style::__get()}, * as well as {@link Style::set_used()}. The latter methods operate on used * values and permit access to any (CSS) property using the following syntax: * * ``` * $style->margin_top = 10.0; * echo $style->margin_top; // Returns `10.0` * ``` * * To declare a property from a string, use {@link Style::set_prop()}: * * ``` * $style->set_prop("margin_top", "1em"); * echo $style->get_specified("margin_top"); // Returns `1em` * echo $style->margin_top; // Returns `12.0`, assuming the default font size * ``` * * Actual CSS parsing is performed in the {@link Stylesheet} class. * * @property string $azimuth * @property string $background_attachment * @property array|string $background_color * @property string $background_image Image URL or `none` * @property string $background_image_resolution * @property array $background_position Pair of `[x, y]`, each value being a length in pt or a percentage value * @property string $background_repeat * @property array|string $background_size `cover`, `contain`, or `[width, height]`, each being a length, percentage, or `auto` * @property string $border_collapse * @property string $border_color Only use for setting all sides to the same color * @property float[] $border_spacing Pair of `[horizontal, vertical]` spacing * @property string $border_style Only use for setting all sides to the same style * @property array|string $border_top_color * @property array|string $border_right_color * @property array|string $border_bottom_color * @property array|string $border_left_color * @property string $border_top_style Valid border style * @property string $border_right_style Valid border style * @property string $border_bottom_style Valid border style * @property string $border_left_style Valid border style * @property float $border_top_width Length in pt * @property float $border_right_width Length in pt * @property float $border_bottom_width Length in pt * @property float $border_left_width Length in pt * @property string $border_width Only use for setting all sides to the same width * @property float|string $border_bottom_left_radius Radius in pt or a percentage value * @property float|string $border_bottom_right_radius Radius in pt or a percentage value * @property float|string $border_top_left_radius Radius in pt or a percentage value * @property float|string $border_top_right_radius Radius in pt or a percentage value * @property string $border_radius Only use for setting all corners to the same radius * @property float|string $bottom Length in pt, a percentage value, or `auto` * @property string $caption_side * @property string $clear * @property string $clip * @property array|string $color * @property ContentPart[]|string $content List of content components, `normal`, or `none` * @property array|string $counter_increment Array defining the counters to increment or `none` * @property array|string $counter_reset Array defining the counters to reset or `none` * @property string $cue_after * @property string $cue_before * @property string $cue * @property string $cursor * @property string $direction * @property string $display * @property string $elevation * @property string $empty_cells * @property string $float * @property string $font_family * @property float $font_size Length in pt * @property string $font_style `normal`, `italic`, or `oblique` * @property string $font_variant * @property int $font_weight Number in the range [1, 1000] * @property float|string $height Length in pt, a percentage value, or `auto` * @property string $image_resolution * @property string $inset Only use for setting all box insets to the same length * @property float|string $left Length in pt, a percentage value, or `auto` * @property float $letter_spacing Length in pt * @property float $line_height Length in pt * @property string $list_style_image Image URL or `none` * @property string $list_style_position `inside` or `outside` * @property string $list_style_type * @property float|string $margin_right Length in pt, a percentage value, or `auto` * @property float|string $margin_left Length in pt, a percentage value, or `auto` * @property float|string $margin_top Length in pt, a percentage value, or `auto` * @property float|string $margin_bottom Length in pt, a percentage value, or `auto` * @property string $margin Only use for setting all sides to the same length * @property float|string $max_height Length in pt, a percentage value, or `none` * @property float|string $max_width Length in pt, a percentage value, or `none` * @property float|string $min_height Length in pt, a percentage value, or `auto` * @property float|string $min_width Length in pt, a percentage value, or `auto` * @property float $opacity Number in the range [0, 1] * @property int $orphans * @property array|string $outline_color * @property string $outline_style Valid border style, except for `hidden` * @property float $outline_width Length in pt * @property float $outline_offset Length in pt * @property string $overflow * @property string $overflow_wrap * @property float|string $padding_top Length in pt or a percentage value * @property float|string $padding_right Length in pt or a percentage value * @property float|string $padding_bottom Length in pt or a percentage value * @property float|string $padding_left Length in pt or a percentage value * @property string $padding Only use for setting all sides to the same length * @property string $page_break_after * @property string $page_break_before * @property string $page_break_inside * @property string $pause_after * @property string $pause_before * @property string $pause * @property string $pitch_range * @property string $pitch * @property string $play_during * @property string $position * @property array|string $quotes List of quote pairs, or `none` * @property string $richness * @property float|string $right Length in pt, a percentage value, or `auto` * @property float[]|string $size Pair of `[width, height]` or `auto` * @property string $speak_header * @property string $speak_numeral * @property string $speak_punctuation * @property string $speak * @property string $speech_rate * @property string $src * @property string $stress * @property string $table_layout * @property string $text_align * @property string $text_decoration * @property float|string $text_indent Length in pt or a percentage value * @property string $text_transform * @property float|string $top Length in pt, a percentage value, or `auto` * @property array $transform List of transforms * @property array $transform_origin Triplet of `[x, y, z]`, each value being a length in pt, or a percentage value for x and y * @property string $unicode_bidi * @property string $unicode_range * @property string $vertical_align * @property string $visibility * @property string $voice_family * @property string $volume * @property string $white_space * @property int $widows * @property float|string $width Length in pt, a percentage value, or `auto` * @property string $word_break * @property float $word_spacing Length in pt * @property int|string $z_index Integer value or `auto` * @property string $_dompdf_keep * * @package dompdf */ class Style { protected const CSS_IDENTIFIER = "-?[_a-zA-Z]+[_a-zA-Z0-9-]*"; protected const CSS_INTEGER = "[+-]?\d+"; protected const CSS_NUMBER = "[+-]?\d*\.?\d+(?:[eE][+-]?\d+)?"; protected const CSS_STRING = "" . '"(?>(?:\\\\["]|[^"])*)(?<!\\\\)"|' . // String "" "'(?>(?:\\\\[']|[^'])*)(?<!\\\\)'"; // String '' protected const CSS_VAR = "var\((([^()]|(?R))*)\)"; /** * @link https://www.w3.org/TR/css-values-4/#calc-syntax */ protected const CSS_MATH_FUNCTIONS = [ // Basic Arithmetic "calc" => true, // Comparison Functions "min" => true, "max" => true, "clamp" => true, // Stepped Value Functions "round" => true, // Not fully supported "mod" => true, "rem" => true, // Trigonometric Functions "sin" => true, "cos" => true, "tan" => true, "asin" => true, "acos" => true, "atan" => true, "atan2" => true, // Exponential Functions "pow" => true, "sqrt" => true, "hypot" => true, "log" => true, "exp" => true, // Sign-Related Functions "abs" => true, "sign" => true ]; /** * https://www.w3.org/TR/css-values-3/#custom-idents */ protected const CUSTOM_IDENT_FORBIDDEN = ["inherit", "initial", "unset", "default"]; /** * Default font size, in points. * * @var float */ public static $default_font_size = 12; /** * Default line height, as a fraction of the font size. * * @var float */ public static $default_line_height = 1.2; /** * Default "absolute" font sizes relative to the default font-size * https://www.w3.org/TR/css-fonts-3/#absolute-size-value * * @var array<float> */ public static $font_size_keywords = [ "xx-small" => 0.6, // 3/5 "x-small" => 0.75, // 3/4 "small" => 0.889, // 8/9 "medium" => 1, // 1 "large" => 1.2, // 6/5 "x-large" => 1.5, // 3/2 "xx-large" => 2.0, // 2/1 ]; /** * List of valid text-align keywords. */ public const TEXT_ALIGN_KEYWORDS = ["left", "right", "center", "justify"]; /** * List of valid vertical-align keywords. */ public const VERTICAL_ALIGN_KEYWORDS = ["baseline", "bottom", "middle", "sub", "super", "text-bottom", "text-top", "top"]; /** * List of all block-level (outer) display types. * * https://www.w3.org/TR/css-display-3/#display-type * * https://www.w3.org/TR/css-display-3/#block-level */ public const BLOCK_LEVEL_TYPES = [ "block", // "flow-root", "list-item", // "flex", // "grid", "table" ]; /** * List of all inline-level (outer) display types. * * https://www.w3.org/TR/css-display-3/#display-type * * https://www.w3.org/TR/css-display-3/#inline-level */ public const INLINE_LEVEL_TYPES = [ "inline", "inline-block", // "inline-flex", // "inline-grid", "inline-table" ]; /** * List of all table-internal (outer) display types. * * https://www.w3.org/TR/css-display-3/#layout-specific-display */ public const TABLE_INTERNAL_TYPES = [ "table-row-group", "table-header-group", "table-footer-group", "table-row", "table-cell", "table-column-group", "table-column", "table-caption" ]; /** * List of all inline (inner) display types. */ public const INLINE_TYPES = ["inline"]; /** * List of all block (inner) display types. */ public const BLOCK_TYPES = ["block", "inline-block", "table-cell", "list-item"]; /** * List of all table (inner) display types. */ public const TABLE_TYPES = ["table", "inline-table"]; /** * Lookup table for valid display types. Initially computed from the * different constants. * * @var array */ protected static $valid_display_types = []; /** * List of all positioned types. */ public const POSITIONED_TYPES = ["relative", "absolute", "fixed"]; /** * List of valid border styles. */ public const BORDER_STYLES = [ "none", "hidden", "dotted", "dashed", "solid", "double", "groove", "ridge", "inset", "outset" ]; /** * List of valid outline-style values. * Same as the border styles, except `auto` is allowed, `hidden` is not. * * @link https://www.w3.org/TR/css-ui-4/#typedef-outline-line-style */ protected const OUTLINE_STYLES = [ "auto", "none", "dotted", "dashed", "solid", "double", "groove", "ridge", "inset", "outset" ]; /** * Map of CSS shorthand properties and their corresponding sub-properties. * The order of the sub-properties is relevant for the fallback getter, * which is used in case no specific getter method is defined. * * @var array<string, string[]> */ protected static $_props_shorthand = [ "background" => [ "background_image", "background_position", "background_size", "background_repeat", // "background_origin", // "background_clip", "background_attachment", "background_color" ], "border" => [ "border_top_width", "border_right_width", "border_bottom_width", "border_left_width", "border_top_style", "border_right_style", "border_bottom_style", "border_left_style", "border_top_color", "border_right_color", "border_bottom_color", "border_left_color" ], "border_top" => [ "border_top_width", "border_top_style", "border_top_color" ], "border_right" => [ "border_right_width", "border_right_style", "border_right_color" ], "border_bottom" => [ "border_bottom_width", "border_bottom_style", "border_bottom_color" ], "border_left" => [ "border_left_width", "border_left_style", "border_left_color" ], "border_width" => [ "border_top_width", "border_right_width", "border_bottom_width", "border_left_width" ], "border_style" => [ "border_top_style", "border_right_style", "border_bottom_style", "border_left_style" ], "border_color" => [ "border_top_color", "border_right_color", "border_bottom_color", "border_left_color" ], "border_radius" => [ "border_top_left_radius", "border_top_right_radius", "border_bottom_right_radius", "border_bottom_left_radius" ], "font" => [ "font_family", "font_size", // "font_stretch", "font_style", "font_variant", "font_weight", "line_height" ], "inset" => [ "top", "right", "bottom", "left" ], "list_style" => [ "list_style_image", "list_style_position", "list_style_type" ], "margin" => [ "margin_top", "margin_right", "margin_bottom", "margin_left" ], "padding" => [ "padding_top", "padding_right", "padding_bottom", "padding_left" ], "outline" => [ "outline_width", "outline_style", "outline_color" ] ]; /** * Maps legacy property names to actual property names. * * @var array<string, string> */ protected static $_props_alias = [ "word_wrap" => "overflow_wrap", "_dompdf_background_image_resolution" => "background_image_resolution", "_dompdf_image_resolution" => "image_resolution", "_webkit_transform" => "transform", "_webkit_transform_origin" => "transform_origin" ]; /** * Default style values. * * @link https://www.w3.org/TR/CSS21/propidx.html * * @var array<string, mixed> */ protected static $_defaults = null; /** * Lookup table for properties that inherit by default. * * @link https://www.w3.org/TR/CSS21/propidx.html * * @var array<string, true> */ protected static $_inherited = [ "azimuth" => true, "background_image_resolution" => true, "border_collapse" => true, "border_spacing" => true, "caption_side" => true, "color" => true, "cursor" => true, "direction" => true, "elevation" => true, "empty_cells" => true, "font_family" => true, "font_size" => true, "font_style" => true, "font_variant" => true, "font_weight" => true, "font" => true, "image_resolution" => true, "letter_spacing" => true, "line_height" => true, "list_style_image" => true, "list_style_position" => true, "list_style_type" => true, "list_style" => true, "orphans" => true, "overflow_wrap" => true, "pitch_range" => true, "pitch" => true, "quotes" => true, "richness" => true, "speak_header" => true, "speak_numeral" => true, "speak_punctuation" => true, "speak" => true, "speech_rate" => true, "stress" => true, "text_align" => true, "text_indent" => true, "text_transform" => true, "visibility" => true, "voice_family" => true, "volume" => true, "white_space" => true, "widows" => true, "word_break" => true, "word_spacing" => true ]; /** * @var array<string, string[]> */ protected static $_dependency_map = [ "border_top_style" => [ "border_top_width" ], "border_bottom_style" => [ "border_bottom_width" ], "border_left_style" => [ "border_left_width" ], "border_right_style" => [ "border_right_width" ], "direction" => [ "text_align" ], "font_size" => [ "background_position", "background_size", "border_top_width", "border_right_width", "border_bottom_width", "border_left_width", "border_top_left_radius", "border_top_right_radius", "border_bottom_right_radius", "border_bottom_left_radius", "letter_spacing", "line_height", "margin_top", "margin_right", "margin_bottom", "margin_left", "outline_width", "outline_offset", "padding_top", "padding_right", "padding_bottom", "padding_left", "word_spacing", "width", "height", "min-width", "min-height", "max-width", "max-height" ], "float" => [ "display" ], "position" => [ "display" ], "outline_style" => [ "outline_width" ] ]; /** * Lookup table for dependent properties. Initially computed from the * dependency map. * * @var array<string, true> */ protected static $_dependent_props = []; /** * Caches method_exists result * * @var array<string, bool> */ protected static $_methods_cache = []; /** * The stylesheet this style belongs to * * @var Stylesheet */ protected $_stylesheet; /** * Media queries attached to the style * * This is a two-dimensional array where the first dimension represents * the media query grouping (logic-or) and the second dimension the * media queries within the grouping. * * The structure of the actual query element is: * - media query feature * - media query value or condition * - media query operator (e.g., not) * * @var array */ protected $_media_queries; /** * Properties set by an `!important` declaration. * * @var array<string, true> */ protected $_important_props = []; /** * Specified (or declared) values of the CSS properties. * * https://www.w3.org/TR/css-cascade-3/#value-stages * * @var array<string, mixed> */ protected $_props = []; /** * Used to track which CSS property were set directly versus * those set via shorthand property * * @var array<string, true> */ protected $_props_specified = []; /** * Computed values of the CSS properties. * * @var array<string, mixed> */ protected $_props_computed = []; /** * Used values of the CSS properties. * * @var array<string, mixed> */ protected $_props_used = []; /** * Marks properties with non-final used values that should be cleared on * style reset. * * @var array<string, true> */ protected $non_final_used = []; /** * Used to track CSS property assignment entry/exit in order to watch * for circular dependencies. * * @var array<int, string> */ protected $_prop_stack = []; /** * Used to track CSS variable resolution entry/exit in order to watch * for circular dependencies. * * @var array<int, string> */ protected $_var_stack = []; /** * Style of the parent element in document tree. * * @var Style */ protected $parent_style; /** * @var Frame|null */ protected $_frame; /** * The origin of the style * * @var int */ protected $_origin = Stylesheet::ORIG_AUTHOR; /** * The computed bottom spacing * * @var float|string|null */ private $_computed_bottom_spacing = null; /** * @var bool|null */ private $has_border_radius_cache = null; /** * @var array|null */ private $resolved_border_radius = null; /** * @var FontMetrics */ private $fontMetrics; /** * @param Stylesheet $stylesheet The stylesheet the style is associated with. * @param int $origin */ public function __construct(Stylesheet $stylesheet, int $origin = Stylesheet::ORIG_AUTHOR) { $this->fontMetrics = $stylesheet->getFontMetrics(); $this->_stylesheet = $stylesheet; $this->_media_queries = []; $this->_origin = $origin; $this->parent_style = null; if (!isset(self::$_defaults)) { // Shorthand $d =& self::$_defaults; // All CSS 2.1 properties, and their default values // Some properties are specified with their computed value for // efficiency; this only works if the computed value is not // dependent on another property $d["azimuth"] = "center"; $d["background_attachment"] = "scroll"; $d["background_color"] = "transparent"; $d["background_image"] = "none"; $d["background_image_resolution"] = "normal"; $d["background_position"] = [0.0, 0.0]; $d["background_repeat"] = "repeat"; $d["background"] = ""; $d["border_collapse"] = "separate"; $d["border_color"] = ""; $d["border_spacing"] = [0.0, 0.0]; $d["border_style"] = ""; $d["border_top"] = ""; $d["border_right"] = ""; $d["border_bottom"] = ""; $d["border_left"] = ""; $d["border_top_color"] = "currentcolor"; $d["border_right_color"] = "currentcolor"; $d["border_bottom_color"] = "currentcolor"; $d["border_left_color"] = "currentcolor"; $d["border_top_style"] = "none"; $d["border_right_style"] = "none"; $d["border_bottom_style"] = "none"; $d["border_left_style"] = "none"; $d["border_top_width"] = "medium"; $d["border_right_width"] = "medium"; $d["border_bottom_width"] = "medium"; $d["border_left_width"] = "medium"; $d["border_width"] = ""; $d["border_bottom_left_radius"] = 0.0; $d["border_bottom_right_radius"] = 0.0; $d["border_top_left_radius"] = 0.0; $d["border_top_right_radius"] = 0.0; $d["border_radius"] = ""; $d["border"] = ""; $d["bottom"] = "auto"; $d["caption_side"] = "top"; $d["clear"] = "none"; $d["clip"] = "auto"; $d["color"] = "#000000"; $d["content"] = "normal"; $d["counter_increment"] = "none"; $d["counter_reset"] = "none"; $d["cue_after"] = "none"; $d["cue_before"] = "none"; $d["cue"] = ""; $d["cursor"] = "auto"; $d["direction"] = "ltr"; $d["display"] = "inline"; $d["elevation"] = "level"; $d["empty_cells"] = "show"; $d["float"] = "none"; $d["font_family"] = $stylesheet->get_dompdf()->getOptions()->getDefaultFont(); $d["font_size"] = "medium"; $d["font_style"] = "normal"; $d["font_variant"] = "normal"; $d["font_weight"] = 400; $d["font"] = ""; $d["height"] = "auto"; $d["image_resolution"] = "normal"; $d["inset"] = ""; $d["left"] = "auto"; $d["letter_spacing"] = "normal"; $d["line_height"] = "normal"; $d["list_style_image"] = "none"; $d["list_style_position"] = "outside"; $d["list_style_type"] = "disc"; $d["list_style"] = ""; $d["margin_right"] = 0.0; $d["margin_left"] = 0.0; $d["margin_top"] = 0.0; $d["margin_bottom"] = 0.0; $d["margin"] = ""; $d["max_height"] = "none"; $d["max_width"] = "none"; $d["min_height"] = "auto"; $d["min_width"] = "auto"; $d["orphans"] = 2; $d["outline_color"] = "currentcolor"; // "invert" special color is not supported $d["outline_style"] = "none"; $d["outline_width"] = "medium"; $d["outline_offset"] = 0.0; $d["outline"] = ""; $d["overflow"] = "visible"; $d["overflow_wrap"] = "normal"; $d["padding_top"] = 0.0; $d["padding_right"] = 0.0; $d["padding_bottom"] = 0.0; $d["padding_left"] = 0.0; $d["padding"] = ""; $d["page_break_after"] = "auto"; $d["page_break_before"] = "auto"; $d["page_break_inside"] = "auto"; $d["pause_after"] = "0"; $d["pause_before"] = "0"; $d["pause"] = ""; $d["pitch_range"] = "50"; $d["pitch"] = "medium"; $d["play_during"] = "auto"; $d["position"] = "static"; $d["quotes"] = "auto"; $d["richness"] = "50"; $d["right"] = "auto"; $d["size"] = "auto"; // @page $d["speak_header"] = "once"; $d["speak_numeral"] = "continuous"; $d["speak_punctuation"] = "none"; $d["speak"] = "normal"; $d["speech_rate"] = "medium"; $d["stress"] = "50"; $d["table_layout"] = "auto"; $d["text_align"] = ""; $d["text_decoration"] = "none"; $d["text_indent"] = 0.0; $d["text_transform"] = "none"; $d["top"] = "auto"; $d["unicode_bidi"] = "normal"; $d["vertical_align"] = "baseline"; $d["visibility"] = "visible"; $d["voice_family"] = ""; $d["volume"] = "medium"; $d["white_space"] = "normal"; $d["widows"] = 2; $d["width"] = "auto"; $d["word_break"] = "normal"; $d["word_spacing"] = "normal"; $d["z_index"] = "auto"; // CSS3 $d["opacity"] = 1.0; $d["background_size"] = ["auto", "auto"]; $d["transform"] = []; $d["transform_origin"] = ["50%", "50%", 0.0]; // for @font-face $d["src"] = ""; $d["unicode_range"] = ""; // vendor-prefixed properties $d["_dompdf_keep"] = ""; // Compute dependent props from dependency map foreach (self::$_dependency_map as $props) { foreach ($props as $prop) { self::$_dependent_props[$prop] = true; } } // Compute valid display-type lookup table self::$valid_display_types = [ "none" => true, "-dompdf-br" => true, "-dompdf-image" => true, "-dompdf-list-bullet" => true, "-dompdf-page" => true ]; foreach (self::BLOCK_LEVEL_TYPES as $val) { self::$valid_display_types[$val] = true; } foreach (self::INLINE_LEVEL_TYPES as $val) { self::$valid_display_types[$val] = true; } foreach (self::TABLE_INTERNAL_TYPES as $val) { self::$valid_display_types[$val] = true; } } } /** * Clear all non-final used values. */ public function reset(): void { foreach (array_keys($this->non_final_used) as $prop) { unset($this->_props_used[$prop]); } $this->non_final_used = []; } /** * @param array $media_queries */ public function set_media_queries(array $media_queries): void { $this->_media_queries = $media_queries; } /** * @return array */ public function get_media_queries(): array { return $this->_media_queries; } /** * @param Frame $frame */ public function set_frame(Frame $frame): void { $this->_frame = $frame; } /** * @return Frame|null */ public function get_frame(): ?Frame { return $this->_frame; } /** * @param int $origin */ public function set_origin(int $origin): void { $this->_origin = $origin; } /** * @return int */ public function get_origin(): int { return $this->_origin; } /** * Returns the {@link Stylesheet} the style is associated with. * * @return Stylesheet */ public function get_stylesheet(): Stylesheet { return $this->_stylesheet; } public function is_custom_property(string $prop): bool { return \substr($prop, 0, 2) === "--"; } public function is_absolute(): bool { $position = $this->__get("position"); return $position === "absolute" || $position === "fixed"; } public function is_in_flow(): bool { $float = $this->__get("float"); return $float === "none" && !$this->is_absolute(); } /** * Converts any CSS length value into an absolute length in points. * * length_in_pt() takes a single length (e.g. '1em') or an array of * lengths and returns an absolute length. If an array is passed, then * the return value is the sum of all elements. If any of the lengths * provided are "auto" or "none" then that value is returned. * * If a reference size is not provided, the current font size is used. * * @param float|string|array $length The numeric length (or string measurement) or array of lengths to resolve. * @param float|null $ref_size An absolute reference size to resolve percentage lengths. * * @return float|string */ public function length_in_pt($length, ?float $ref_size = null) { $font_size = $this->__get("font_size"); $ref_size = $ref_size ?? $font_size; if (!\is_array($length)) { $length = [$length]; } $ret = 0.0; foreach ($length as $l) { if ($l === "auto" || $l === "none") { return $l; } // Assume numeric values are already in points if (is_numeric($l)) { $ret += (float) $l; continue; } $val = $this->single_length_in_pt((string) $l, $ref_size, $font_size); $ret += $val ?? 0; } return $ret; } /** * Convert a length declaration to pt. * * @param string $l The length declaration. * @param float $ref_size Reference size for percentage declarations. * @param float|null $font_size Font size for resolving font-size relative units. * * @return float|null The length in pt, or `null` for invalid declarations. */ protected function single_length_in_pt(string $l, float $ref_size = 0, ?float $font_size = null): ?float { static $cache = []; $font_size = $font_size ?? $this->__get("font_size"); $key = "$l/$ref_size/$font_size"; if (\array_key_exists($key, $cache)) { return $cache[$key]; } $number = self::CSS_NUMBER; $pattern = "/^($number)([a-zA-Z%]*)?$/"; if (!preg_match($pattern, $l, $matches)) { $ident = self::CSS_IDENTIFIER; $pattern = "/^($ident)\(.*\)$/i"; if (preg_match($pattern, $l)) { $value = $this->evaluate_func($this->parse_func($l), $ref_size, $font_size); return $cache[$key] = $value; } return null; } $v = (float) $matches[1]; $unit = strtolower($matches[2]); if ($unit === "") { // Legacy support for unitless values, not covered by spec. Might // want to restrict this to unitless `0` in the future $value = $v; } elseif ($unit === "%") { $value = $v / 100 * $ref_size; } elseif ($unit === "px") { $dpi = $this->_stylesheet->get_dompdf()->getOptions()->getDpi(); $value = ($v * 72) / $dpi; } elseif ($unit === "pt") { $value = $v; } elseif ($unit === "rem") { $tree = $this->_stylesheet->get_dompdf()->getTree(); $root_style = $tree !== null ? $tree->get_root()->get_style() : null; $root_font_size = $root_style === null || $root_style === $this ? $font_size : $root_style->__get("font_size"); $value = $v * $root_font_size; // Skip caching if the root style is not available yet, as to avoid // incorrectly cached values if the root font size is different from // the default if ($root_style === null) { return $value; } } elseif ($unit === "em") { $value = $v * $font_size; } elseif ($unit === "cm") { $value = $v * 72 / 2.54; } elseif ($unit === "mm") { $value = $v * 72 / 25.4; } elseif ($unit === "ex") { // FIXME: em:ex ratio? $value = $v * $font_size / 2; } elseif ($unit === "in") { $value = $v * 72; } elseif ($unit === "pc") { $value = $v * 12; } else { // Invalid or unsupported declaration $value = null; } return $cache[$key] = $value; } /** * Shunting-yard Algorithm * @param string $expr infix expression * @return array */ private function parse_func(string $expr): array { if (substr_count($expr, '(') !== substr_count($expr, ')')) { return []; } $expr = str_replace(['(', ')', '*', '/', ','], [' ( ', ' ) ', ' * ', ' / ', ' , '], $expr); $expr = trim(preg_replace('/\s+/', ' ', $expr)); if ($expr === '') { return []; } $precedence = ['*' => 3, '/' => 3, '+' => 2, '-' => 2, ',' => 1]; $opStack = []; $queue = []; $parts = explode(' ', $expr); foreach ($parts as $part) { if ($part === '(') { $opStack[] = $part; } elseif (\array_key_exists(strtolower($part), self::CSS_MATH_FUNCTIONS)) { $opStack[] = strtolower($part); } elseif ($part === ')') { while (\count($opStack) > 0 && end($opStack) !== '(' && !\array_key_exists(end($opStack), self::CSS_MATH_FUNCTIONS)) { $queue[] = array_pop($opStack); } if (end($opStack) === '(') { array_pop($opStack); } if (\count($opStack) > 0 && \array_key_exists(end($opStack), self::CSS_MATH_FUNCTIONS)) { $queue[] = array_pop($opStack); } } elseif (\array_key_exists($part, $precedence)) { while (\count($opStack) > 0 && end($opStack) !== '(' && $precedence[end($opStack)] >= $precedence[$part]) { $queue[] = array_pop($opStack); } $opStack[] = $part; } else { $queue[] = $part; } } while (\count($opStack) > 0) { $queue[] = array_pop($opStack); } return $queue; } /** * Reverse Polish Notation * @param array $rpn * @param float $ref_size * @param float|null $font_size * @return float|null */ private function evaluate_func(array $rpn, float $ref_size = 0, ?float $font_size = null): ?float { if (\count($rpn) === 0) { return null; } $ops = ['*', '/', '+', '-', ',']; $stack = []; foreach ($rpn as $part) { if (\array_key_exists($part, self::CSS_MATH_FUNCTIONS)) { $argv = array_pop($stack); if (!is_array($argv)) { $argv = [$argv]; } $argc = \count($argv); switch ($part) { case 'abs': case 'acos': case 'asin': case 'atan': case 'cos': case 'exp': case 'sin': case 'sqrt': case 'tan': if ($argc !== 1) { return null; } $stack[] = call_user_func_array($part, $argv); break; case 'atan2': case 'hypot': case 'pow': if ($argc !== 2) { return null; } $stack[] = call_user_func_array($part, $argv); break; case 'log': if ($argc === 1) { $stack[] = log($argv[0]); } elseif ($argc === 2) { $stack[] = log($argv[0], $argv[1]); } else { return null; } break; case 'max': $stack[] = max($argv); break; case 'min': $stack[] = min($argv); break; case 'mod': if ($argc !== 2 || $argv[1] === 0.0) { return null; } if ($argv[1] > 0) { $stack[] = $argv[0] - floor($argv[0] / $argv[1]) * $argv[1]; } else { $stack[] = $argv[0] - ceil($argv[0] * -1 / $argv[1]) * $argv[1] * -1 ; } break; case 'rem': if ($argc !== 2 || $argv[1] === 0.0) { return null; } $stack[] = $argv[0] - (intval($argv[0] / $argv[1]) * $argv[1]); break; case 'round': if ($argc !== 2 || $argv[1] === 0.0) { return null; } if ($argv[0] >= 0) { $stack[] = round($argv[0] / $argv[1], 0, PHP_ROUND_HALF_UP) * $argv[1]; } else { $stack[] = round($argv[0] / $argv[1], 0, PHP_ROUND_HALF_DOWN) * $argv[1]; } break; case 'calc': if ($argc !== 1) { return null; } $stack[] = $argv[0]; break; case 'clamp': if ($argc !== 3) { return null; } $stack[] = max($argv[0], min($argv[1], $argv[2])); break; case 'sign': if ($argc !== 1) { return null; } $stack[] = $argv[0] == 0 ? 0.0 : ($argv[0] / abs($argv[0])); break; default: return null; } } elseif (\in_array($part, $ops, true)) { $rightValue = array_pop($stack); $leftValue = array_pop($stack); if ($rightValue === null || $leftValue === null) { return null; } switch ($part) { case '*': $stack[] = $leftValue * $rightValue; break; case '/': if ($rightValue === 0.0) { return null; } $stack[] = $leftValue / $rightValue; break; case '+': $stack[] = $leftValue + $rightValue; break; case '-': $stack[] = $leftValue - $rightValue; break; case ',': if (is_array($leftValue)) { $leftValue[] = $rightValue; $stack[] = $leftValue; } else { $stack[] = [$leftValue, $rightValue]; } break; } } else { $val = $this->single_length_in_pt($part, $ref_size, $font_size); if ($val === null) { return null; } $stack[] = $val; } } if (\count($stack) > 1) { return null; } return floatval(end($stack)); } /** * Resolves the actual values for used CSS custom properties. * * This function receives the whole content of the var() function, which * can also include a fallback value. */ private function parse_var($matches) { $variable = is_array($matches) ? $matches[1] : $matches; if (\in_array($variable, $this->_var_stack, true)) { return null; } array_push($this->_var_stack, $variable); // Split property name and an optional fallback value. [$custom_prop, $fallback] = explode(',', $variable, 2) + ['', '']; $fallback = trim($fallback); // Try to retrieve the custom property value, or use the fallback value // if the value could not be resolved. $value = $this->computed($custom_prop) ?? $fallback; // If the resolved value also has vars in it, resolve again. $pattern = self::CSS_VAR; $value = preg_replace_callback( "/$pattern/", [$this, "parse_var"], $value); array_pop($this->_var_stack); return $value ?: null; } /** * Resolve inherited property values using the provided parent style or the * default values, in case no parent style exists. * * https://www.w3.org/TR/css-cascade-3/#inheriting * * @param Style|null $parent */ public function inherit(?Style $parent = null): void { $this->parent_style = $parent; // Clear the computed font size, as it might depend on the parent // font size unset($this->_props_computed["font_size"]); unset($this->_props_used["font_size"]); if ($parent) { // For properties that inherit by default: When the cascade did // not result in a value, inherit the parent value. Inheritance // is handled via the specific sub-properties for shorthands. Custom // properties (variables) are selected by the -- prefix. foreach ($parent->_props as $prop => $val) { if ( !isset($this->_props[$prop]) && ( isset(self::$_inherited[$prop]) || $this->is_custom_property($prop) ) ) { $parent_val = $parent->computed($prop); if ($this->is_custom_property($prop)) { $this->set_prop($prop, $parent_val); } else { $this->_props[$prop] = $parent_val; $this->_props_computed[$prop] = $parent_val; $this->_props_used[$prop] = null; } } } } foreach ($this->_props as $prop => $val) { if ($val === "inherit") { if ($parent && isset($parent->_props[$prop])) { $parent_val = $parent->computed($prop); if ($this->is_custom_property($prop)) { $this->set_prop($prop, $parent_val); } else { $this->_props[$prop] = $parent_val; $this->_props_computed[$prop] = $parent_val; $this->_props_used[$prop] = null; } } else { if ($this->is_custom_property($prop)) { $this->set_prop($prop, "unset"); } else { // Parent prop not set, use default $this->_props[$prop] = self::$_defaults[$prop]; unset($this->_props_computed[$prop]); unset($this->_props_used[$prop]); } } } } } /** * Override properties in this style with those in $style * * @param Style $style */ public function merge(Style $style): void { foreach ($style->_props as $prop => $val) { $important = isset($style->_important_props[$prop]); // `!important` declarations take precedence over normal ones if (!$important && isset($this->_important_props[$prop])) { continue; } if ($important) { $this->_important_props[$prop] = true; } if ($this->is_custom_property($prop)) { $this->set_prop($prop, $val, $important); } else { $this->_props[$prop] = $val; } // Copy an existing computed value only for non-dependent // properties; otherwise it may be invalid for the current style if (!isset(self::$_dependent_props[$prop]) && \array_key_exists($prop, $style->_props_computed) ) { $this->_props_computed[$prop] = $style->_props_computed[$prop]; $this->_props_used[$prop] = null; } else { unset($this->_props_computed[$prop]); unset($this->_props_used[$prop]); } if (\array_key_exists($prop, $style->_props_specified)) { $this->_props_specified[$prop] = true; } } // re-evalutate CSS variables foreach (array_keys($this->_props) as $prop) { if (!$this->is_custom_property($prop)) { continue; } $this->set_prop($prop, $this->_props[$prop], isset($this->_important_props[$prop])); } } /** * Clear information about important declarations after the style has been * finalized during stylesheet loading. */ public function clear_important(): void { $this->_important_props = []; } /** * Clear border-radius and bottom-spacing cache as necessary when a given * property is set. * * @param string $prop The property that is set. */ protected function clear_cache(string $prop): void { // Clear border-radius cache on setting any border-radius // property if ($prop === "border_top_left_radius" || $prop === "border_top_right_radius" || $prop === "border_bottom_left_radius" || $prop === "border_bottom_right_radius" ) { $this->has_border_radius_cache = null; $this->resolved_border_radius = null; } // Clear bottom-spacing cache if necessary. Border style can // disable/enable border calculations if ($prop === "margin_bottom" || $prop === "padding_bottom" || $prop === "border_bottom_width" || $prop === "border_bottom_style" ) { $this->_computed_bottom_spacing = null; } } /** * Set a style property from a value declaration. * * Setting `$clear_dependencies` to `false` is useful for saving a bit of * unnecessary work while loading stylesheets. * * @param string $prop The property to set. * @param mixed $val The value declaration or computed value. * @param bool $important Whether the declaration is important. * @param bool $clear_dependencies Whether to clear computed values of dependent properties. */ public function set_prop(string $prop, $val, bool $important = false, bool $clear_dependencies = true): void { // Skip some checks for CSS custom properties. if (!$this->is_custom_property($prop)) { $prop = str_replace("-", "_", $prop); // Legacy property aliases if (isset(self::$_props_alias[$prop])) { $prop = self::$_props_alias[$prop]; } if (!isset(self::$_defaults[$prop])) { global $_dompdf_warnings; $_dompdf_warnings[] = "'$prop' is not a recognized CSS property."; return; } } $this->_props_specified[$prop] = true; // Trim declarations unconditionally, but only lower-case for comparison // with the general keywords. Properties must handle case-insensitive // comparisons individually if (\is_string($val)) { $val = trim($val); $lower = strtolower($val); if ($lower === "initial" || $lower === "inherit" || $lower === "unset") { $val = $lower; } } if (isset(self::$_props_shorthand[$prop])) { // Shorthand properties directly set their respective sub-properties // https://www.w3.org/TR/css-cascade-3/#shorthand if ($val === "initial" || $val === "inherit" || $val === "unset") { foreach (self::$_props_shorthand[$prop] as $sub_prop) { $this->set_prop($sub_prop, $val, $important, $clear_dependencies); } } else { $method = "_set_$prop"; // Resolve the CSS custom property value(s). $pattern = self::CSS_VAR; // Always set the specified value for properties that use CSS variables // so that an invalid initial value does not prevent re-computation later. $this->_props[$prop] = $val; //TODO: we shouldn't need to parse this twice preg_match_all("/$pattern/", $val, $matches, PREG_SET_ORDER); foreach ($matches as $match) { if ($this->parse_var($match) === null) { // unset specified as for specific prop under expectation it will be overridden foreach (self::$_props_shorthand[$prop] as $sub_prop) { unset($this->_props_specified[$sub_prop]); } return; } } $val = preg_replace_callback( "/$pattern/", [$this, "parse_var"], $val); if (!isset(self::$_methods_cache[$method])) { self::$_methods_cache[$method] = method_exists($this, $method); } if (self::$_methods_cache[$method]) { $values = $this->$method($val); if ($values === []) { return; } // Each missing sub-property is assigned its initial value // https://www.w3.org/TR/css-cascade-3/#shorthand foreach (self::$_props_shorthand[$prop] as $sub_prop) { $sub_val = $values[$sub_prop] ?? self::$_defaults[$sub_prop]; $this->set_prop($sub_prop, $sub_val, $important, $clear_dependencies); unset($this->_props_specified[$sub_prop]); } } } } else { // Legacy support for `word-break: break-word` // https://www.w3.org/TR/css-text-3/#valdef-word-break-break-word if ($prop === "word_break" && \is_string($val) && strcasecmp($val, "break-word") === 0 ) { $val = "normal"; $this->set_prop("overflow_wrap", "anywhere", $important, $clear_dependencies); } // `!important` declarations take precedence over normal ones if (!$important && isset($this->_important_props[$prop])) { return; } if ($important) { $this->_important_props[$prop] = true; } // https://www.w3.org/TR/css-cascade-3/#inherit-initial if ($val === "unset") { $val = isset(self::$_inherited[$prop]) || $this->is_custom_property($prop) ? "inherit" : "initial"; } // https://www.w3.org/TR/css-cascade-3/#valdef-all-initial if ($val === "initial" && !$this->is_custom_property($prop)) { $val = self::$_defaults[$prop]; } // Always set the specified value for properties that use CSS variables // so that an invalid initial value does not prevent re-computation later. if (\is_string($val) && \preg_match("/" . self::CSS_VAR . "/", $val)) { $this->_props[$prop] = $val; } $computed = $this->compute_prop($prop, $val); // Skip invalid declarations if ($computed === null) { return; } $this->_props[$prop] = $val; $this->_props_computed[$prop] = $computed; $this->_props_used[$prop] = null; //TODO: this should be a directed dependency map if ($this->is_custom_property($prop) && !\in_array($prop, $this->_prop_stack, true)) { array_push($this->_prop_stack, $prop); $specified_props = array_filter($this->_props, function($key) { return \array_key_exists($key, $this->_props_specified); }, ARRAY_FILTER_USE_KEY); // copy existing props filtered by those set explicitly before parsing vars foreach ($specified_props as $specified_prop => $specified_value) { if (!$this->is_custom_property($specified_prop) || strpos($specified_value, "var($prop") !== false) { $this->set_prop($specified_prop, $specified_value, isset($this->_important_props[$specified_prop]), true); if (isset(self::$_props_shorthand[$specified_prop])) { foreach (self::$_props_shorthand[$specified_prop] as $sub_prop) { if (\array_key_exists($sub_prop, $specified_props)) { $this->set_prop($sub_prop, $specified_props[$sub_prop], isset($this->_important_props[$sub_prop]), true); } } } } } array_pop($this->_prop_stack); } if ($clear_dependencies) { // Clear the computed values of any dependent properties, so // they can be re-computed if (isset(self::$_dependency_map[$prop])) { foreach (self::$_dependency_map[$prop] as $dependent) { unset($this->_props_computed[$dependent]); unset($this->_props_used[$dependent]); } } $this->clear_cache($prop); } } } /** * Get the specified value of a style property. * * @param string $prop * * @return mixed * @throws Exception */ public function get_specified(string $prop) { // Legacy property aliases if (isset(self::$_props_alias[$prop])) { $prop = self::$_props_alias[$prop]; } if (!isset(self::$_defaults[$prop]) && !$this->is_custom_property($prop)) { throw new Exception("'$prop' is not a recognized CSS property."); } return $this->_props[$prop] ?? self::$_defaults[$prop]; } /** * Set a style property to its final value. * * This sets the specified and used value of the style property to the given * value, meaning the value is not parsed and thus should have a type * compatible with the property. * * If a shorthand property is specified, all of its sub-properties are set * to the given value. * * @param string $prop The property to set. * @param mixed $val The final value of the property. * * @throws Exception */ public function __set(string $prop, $val) { // Legacy property aliases if (isset(self::$_props_alias[$prop])) { $prop = self::$_props_alias[$prop]; } if (!isset(self::$_defaults[$prop]) && !$this->is_custom_property($prop)) { throw new Exception("'$prop' is not a recognized CSS property."); } if (isset(self::$_props_shorthand[$prop])) { foreach (self::$_props_shorthand[$prop] as $sub_prop) { $this->__set($sub_prop, $val); } } else { $this->_props[$prop] = $val; $this->_props_computed[$prop] = $val; $this->_props_used[$prop] = $val; $this->clear_cache($prop); } } /** * Set the used value of a style property. * * Used values are cleared on style reset. * * If a shorthand property is specified, all of its sub-properties are set * to the given value. * * @param string $prop The property to set. * @param mixed $val The used value of the property. * * @throws Exception */ public function set_used(string $prop, $val): void { // Legacy property aliases if (isset(self::$_props_alias[$prop])) { $prop = self::$_props_alias[$prop]; } if (!isset(self::$_defaults[$prop])) { throw new Exception("'$prop' is not a recognized CSS property."); } if (isset(self::$_props_shorthand[$prop])) { foreach (self::$_props_shorthand[$prop] as $sub_prop) { $this->set_used($sub_prop, $val); } } else { $this->_props_used[$prop] = $val; $this->non_final_used[$prop] = true; } } /** * Get the used or computed value of a style property, depending on whether * the used value has been determined yet. * * @param string $prop * * @return mixed * @throws Exception */ public function __get(string $prop) { // Legacy property aliases if (isset(self::$_props_alias[$prop])) { $prop = self::$_props_alias[$prop]; } if (!isset(self::$_defaults[$prop]) && !$this->is_custom_property($prop)) { throw new Exception("'$prop' is not a recognized CSS property."); } if (isset($this->_props_used[$prop])) { return $this->_props_used[$prop]; } $method = "_get_$prop"; if (!isset(self::$_methods_cache[$method])) { self::$_methods_cache[$method] = method_exists($this, $method); } if (isset(self::$_props_shorthand[$prop])) { // Don't cache shorthand values, always use getter. If no dedicated // getter exists, use a simple fallback getter concatenating all // sub-property values if (self::$_methods_cache[$method]) { return $this->$method(); } else { return implode(" ", array_map(function ($sub_prop) { $val = $this->__get($sub_prop); return \is_array($val) ? implode(" ", $val) : $val; }, self::$_props_shorthand[$prop])); } } else { $computed = $this->computed($prop); $used = self::$_methods_cache[$method] ? $this->$method($computed) : $computed; $this->_props_used[$prop] = $used; return $used; } } /** * @param string $prop The property to compute. * @param mixed $val The value to compute. Non-string values are treated as already computed. * * @return mixed The computed value. */ protected function compute_prop(string $prop, $val) { // During style merge, the parent style is not available yet, so // temporarily use the initial value for `inherit` properties. The // keyword is properly resolved during inheritance if ($val === "inherit" && !$this->is_custom_property($prop)) { $val = self::$_defaults[$prop]; } // Check for values which are already computed if (!\is_string($val)) { return $val; } // Resolve the CSS custom property value(s). $pattern = self::CSS_VAR; $val = preg_replace_callback( "/$pattern/", [$this, "parse_var"], $val); $method = "_compute_$prop"; if (!isset(self::$_methods_cache[$method])) { self::$_methods_cache[$method] = method_exists($this, $method); } if (self::$_methods_cache[$method]) { return $this->$method($val); } elseif ($val !== "") { return strtolower($val); } else { return null; } } /** * Get the computed value for the given property. * * @param string $prop The property to get the computed value of. * * @return mixed The computed value. */ protected function computed(string $prop) { if (!\array_key_exists($prop, $this->_props_computed)) { if (!\array_key_exists($prop, $this->_props) && $this->is_custom_property($prop)) { return null; } $val = $this->_props[$prop] ?? self::$_defaults[$prop]; $computed = $this->compute_prop($prop, $val); if ($computed === null) { if ($this->is_custom_property($prop)) { return null; } $computed = $this->compute_prop($prop, self::$_defaults[$prop]); } $this->_props_computed[$prop] = $computed; } return $this->_props_computed[$prop]; } /** * @param float $cbw The width of the containing block. * @return float|string|null */ public function computed_bottom_spacing(float $cbw) { // Caching the bottom spacing independently of the given width is a bit // iffy, but should be okay, as the containing block should only // potentially change after a page break, and the style is reset in that // case if ($this->_computed_bottom_spacing !== null) { return $this->_computed_bottom_spacing; } return $this->_computed_bottom_spacing = $this->length_in_pt( [ $this->margin_bottom, $this->padding_bottom, $this->border_bottom_width ], $cbw ); } /** * Returns an `array(r, g, b, "r" => r, "g" => g, "b" => b, "alpha" => alpha, "hex" => "#rrggbb")` * based on the provided CSS color value. * * @param string|null $color * @return array|string|null */ public function munge_color($color) { return Color::parse($color); } /** * @return string */ public function get_font_family_raw(): string { return trim($this->_props["font_family"], " \t\n\r\x0B\"'"); } /** * @return string[] */ public function get_font_family_computed(): array { return $this->computed("font_family"); } /** * Getter for the `font-family` CSS property. * * Uses the {@link FontMetrics} class to resolve the font family into an * actual font file. * * @param string[] $computed * @return string * * @throws Exception * * @link https://www.w3.org/TR/CSS21/fonts.html#propdef-font-family */ protected function _get_font_family($computed): string { // TODO: It probably makes sense to perform the font selection outside // the Style class completely. It is now done primarily in // `FrameDecorator\Text::apply_font_mapping` // Select the appropriate font. First determine the subtype, then check // the specified font-families for a candidate. $fontMetrics = $this->getFontMetrics(); $weight = $this->__get("font_weight"); $fontStyle = $this->__get("font_style"); $subtype = $fontMetrics->getType($weight . ' ' . $fontStyle); foreach ($computed as $family) { $font = $fontMetrics->getFont($family, $subtype); if ($font !== null) { return $font; } } $font = $fontMetrics->getFont(null, $subtype); if ($font !== null) { return $font; } $specified = implode(", ", $computed); throw new Exception("Unable to find a suitable font replacement for: '$specified'"); } /** * @param float $computed * @return float * * @link https://www.w3.org/TR/CSS21/fonts.html#propdef-font-size */ protected function _get_font_size($computed) { // Computed value may be negative when specified via `calc()` return max($computed, 0.0); } /** * @param float|string $computed * @return float * * @link https://www.w3.org/TR/css-text-4/#word-spacing-property */ protected function _get_word_spacing($computed) { if (\is_float($computed)) { return $computed; } // Resolve percentage values $font_size = $this->__get("font_size"); return $this->single_length_in_pt($computed, $font_size); } /** * @param float|string $computed * @return float * * @link https://www.w3.org/TR/css-text-4/#letter-spacing-property */ protected function _get_letter_spacing($computed) { if (\is_float($computed)) { return $computed; } // Resolve percentage values $font_size = $this->__get("font_size"); return $this->single_length_in_pt($computed, $font_size); } /** * @param float|string $computed * @return float * * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-line-height */ protected function _get_line_height($computed) { // Lengths have been computed to float, number values to string if (\is_float($computed)) { // Computed value may be negative when specified via `calc()` return max($computed, 0.0); } $font_size = $this->__get("font_size"); $factor = $computed === "normal" ? self::$default_line_height : (float) $computed; return $factor * $font_size; } /** * @param string $computed * @param bool $current_is_parent * * @return array|string */ protected function get_color_value($computed, bool $current_is_parent = false) { if ($computed === "currentcolor") { // https://www.w3.org/TR/css-color-4/#resolving-other-colors if ($current_is_parent) { // Use the `color` value from the parent for the `color` // property itself return isset($this->parent_style) ? $this->parent_style->__get("color") : $this->munge_color(self::$_defaults["color"]); } return $this->__get("color"); } return $this->munge_color($computed) ?? "transparent"; } /** * Returns the color as an array * * The array has the following format: * `array(r, g, b, "r" => r, "g" => g, "b" => b, "alpha" => alpha, "hex" => "#rrggbb")` * * @param string $computed * @return array|string * * @link https://www.w3.org/TR/CSS21/colors.html#propdef-color */ protected function _get_color($computed) { return $this->get_color_value($computed, true); } /** * Returns the background color as an array * * See {@link Style::_get_color()} for format of the color array. * * @param string $computed * @return array|string * * @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-color */ protected function _get_background_color($computed) { return $this->get_color_value($computed); } /** * Returns the background image URI, or "none" * * @param string $computed * @return string * * @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-image */ protected function _get_background_image($computed): string { return $this->_stylesheet->resolve_url($computed, true); } /** * Returns the border color as an array * * See {@link Style::_get_color()} for format of the color array. * * @param string $computed * @return array|string * * @link https://www.w3.org/TR/CSS21/box.html#border-color-properties */ protected function _get_border_top_color($computed) { return $this->get_color_value($computed); } /** * @param string $computed * @return array|string */ protected function _get_border_right_color($computed) { return $this->get_color_value($computed); } /** * @param string $computed * @return array|string */ protected function _get_border_bottom_color($computed) { return $this->get_color_value($computed); } /** * @param string $computed * @return array|string */ protected function _get_border_left_color($computed) { return $this->get_color_value($computed); } /** * Return an array of all border properties. * * The returned array has the following structure: * * ``` * array("top" => array("width" => [border-width], * "style" => [border-style], * "color" => [border-color (array)]), * "bottom" ... ) * ``` * * @return array */ public function get_border_properties(): array { return [ "top" => [ "width" => $this->__get("border_top_width"), "style" => $this->__get("border_top_style"), "color" => $this->__get("border_top_color"), ], "bottom" => [ "width" => $this->__get("border_bottom_width"), "style" => $this->__get("border_bottom_style"), "color" => $this->__get("border_bottom_color"), ], "right" => [ "width" => $this->__get("border_right_width"), "style" => $this->__get("border_right_style"), "color" => $this->__get("border_right_color"), ], "left" => [ "width" => $this->__get("border_left_width"), "style" => $this->__get("border_left_style"), "color" => $this->__get("border_left_color"), ], ]; } /** * Return a single border-side property * * @param string $side * @return string */ protected function get_border_side(string $side): string { $color = $this->__get("border_{$side}_color"); return $this->__get("border_{$side}_width") . " " . $this->__get("border_{$side}_style") . " " . (\is_array($color) ? $color["hex"] : $color); } /** * Return full border properties as a string * * Border properties are returned just as specified in CSS: * `[width] [style] [color]` * e.g. "1px solid blue" * * @return string * * @link https://www.w3.org/TR/CSS21/box.html#border-shorthand-properties */ protected function _get_border_top(): string { return $this->get_border_side("top"); } /** * @return string */ protected function _get_border_right(): string { return $this->get_border_side("right"); } /** * @return string */ protected function _get_border_bottom(): string { return $this->get_border_side("bottom"); } /** * @return string */ protected function _get_border_left(): string { return $this->get_border_side("left"); } public function has_border_radius(): bool { if (isset($this->has_border_radius_cache)) { return $this->has_border_radius_cache; } // Use a fixed ref size here. We don't know the border-box width here // and font size might be 0. Since we are only interested in whether // there is any border radius at all, this should do $tl = (float) $this->length_in_pt($this->border_top_left_radius, 12); $tr = (float) $this->length_in_pt($this->border_top_right_radius, 12); $br = (float) $this->length_in_pt($this->border_bottom_right_radius, 12); $bl = (float) $this->length_in_pt($this->border_bottom_left_radius, 12); $this->has_border_radius_cache = $tl + $tr + $br + $bl > 0; return $this->has_border_radius_cache; } /** * Get the final border-radius values to use. * * Percentage values are resolved relative to the width of the border box. * The border radius is additionally scaled for the given render box, and * constrained by its width and height. * * @param float[] $border_box The border box of the frame. * @param float[]|null $render_box The box to resolve the border radius for. * * @return float[] A 4-tuple of top-left, top-right, bottom-right, and bottom-left radius. */ public function resolve_border_radius( array $border_box, ?array $render_box = null ): array { $render_box = $render_box ?? $border_box; $use_cache = $render_box === $border_box; if ($use_cache && isset($this->resolved_border_radius)) { return $this->resolved_border_radius; } [$x, $y, $w, $h] = $border_box; // Resolve percentages relative to width, as long as we have no support // for per-axis radii $tl = (float) $this->length_in_pt($this->border_top_left_radius, $w); $tr = (float) $this->length_in_pt($this->border_top_right_radius, $w); $br = (float) $this->length_in_pt($this->border_bottom_right_radius, $w); $bl = (float) $this->length_in_pt($this->border_bottom_left_radius, $w); if ($tl + $tr + $br + $bl > 0) { [$rx, $ry, $rw, $rh] = $render_box; $t_offset = $y - $ry; $r_offset = $rx + $rw - $x - $w; $b_offset = $ry + $rh - $y - $h; $l_offset = $x - $rx; if ($tl > 0) { $tl = max($tl + ($t_offset + $l_offset) / 2, 0); } if ($tr > 0) { $tr = max($tr + ($t_offset + $r_offset) / 2, 0); } if ($br > 0) { $br = max($br + ($b_offset + $r_offset) / 2, 0); } if ($bl > 0) { $bl = max($bl + ($b_offset + $l_offset) / 2, 0); } if ($tl + $bl > $rh) { $f = $rh / ($tl + $bl); $tl = $f * $tl; $bl = $f * $bl; } if ($tr + $br > $rh) { $f = $rh / ($tr + $br); $tr = $f * $tr; $br = $f * $br; } if ($tl + $tr > $rw) { $f = $rw / ($tl + $tr); $tl = $f * $tl; $tr = $f * $tr; } if ($bl + $br > $rw) { $f = $rw / ($bl + $br); $bl = $f * $bl; $br = $f * $br; } } $values = [$tl, $tr, $br, $bl]; if ($use_cache) { $this->resolved_border_radius = $values; } return $values; } /** * Returns the outline color as an array * * See {@link Style::_get_color()} for format of the color array. * * @param string $computed * @return array|string * * @link https://www.w3.org/TR/css-ui-4/#propdef-outline-color */ protected function _get_outline_color($computed) { return $this->get_color_value($computed); } /** * @param string $computed * @return string * * @link https://www.w3.org/TR/css-ui-4/#propdef-outline-style */ protected function _get_outline_style($computed): string { return $computed === "auto" ? "solid" : $computed; } /** * Return full outline properties as a string * * Outline properties are returned just as specified in CSS: * `[width] [style] [color]` * e.g. "1px solid blue" * * @return string * * @link https://www.w3.org/TR/CSS21/box.html#border-shorthand-properties */ protected function _get_outline(): string { $color = $this->__get("outline_color"); return $this->__get("outline_width") . " " . $this->__get("outline_style") . " " . (\is_array($color) ? $color["hex"] : $color); } /** * Returns the list style image URI, or "none" * * @param string $computed * @return string * * @link https://www.w3.org/TR/CSS21/generate.html#propdef-list-style-image */ protected function _get_list_style_image($computed): string { return $this->_stylesheet->resolve_url($computed, true); } /** * @param array|string $computed * @return array|string * * @link https://www.w3.org/TR/css-content-3/#quotes */ protected function _get_quotes($computed) { if ($computed === "auto") { // TODO: Use typographically appropriate quotes for the current // language here return [['"', '"'], ["'", "'"]]; } return $computed; } /*==============================*/ /** * Parse a property value into its components. * * @param string $value * * @return string[] */ protected function parse_property_value(string $value): array { $string = self::CSS_STRING; $ident = self::CSS_IDENTIFIER; $number = self::CSS_NUMBER; $pattern = "/\n" . "\s* (?<string>$string) |\n" . // String "\s* (url \( (?> (\\\\[\"'()] | [^\"'()])* ) (?<!\\\\)\) ) |\n" . // URL without quotes "\s* ($ident (\( ((?> \g<string> | [^\"'()]+ ) | (?-2))* \)) ) |\n" . // Function (with balanced parentheses) "\s* ($ident) |\n" . // Keyword "\s* (\#[0-9a-fA-F]*) |\n" . // Hex value "\s* ($number [a-zA-Z%]*) |\n" . // Number (+ unit/percentage) "\s* ([\/,;]) \n" . // Delimiter "/iSx"; if (!preg_match_all($pattern, $value, $matches)) { return []; } return array_map("trim", $matches[0]); } protected function is_color_value(string $val): bool { return $val === "currentcolor" || $val === "transparent" || isset(Color::$cssColorNames[$val]) || preg_match("/^#|rgb\(|rgba\(|cmyk\(/", $val); } /** * @param string $val * @return string|null */ protected function compute_color_value(string $val): ?string { // https://www.w3.org/TR/css-color-4/#resolving-other-colors $val = strtolower($val); $munged_color = $val !== "currentcolor" ? $this->munge_color($val) : $val; if ($munged_color === null) { return null; } return \is_array($munged_color) ? $munged_color["hex"] : $munged_color; } /** * @param string $val * @return int|null */ protected function compute_integer(string $val): ?int { $integer = self::CSS_INTEGER; return preg_match("/^$integer$/", $val) ? (int) $val : null; } /** * @param string $val * @return float|null */ protected function compute_number(string $val): ?float { $number = self::CSS_NUMBER; return preg_match("/^$number$/", $val) ? (float) $val : null; } /** * @param string $val * @return float|null */ protected function compute_length(string $val): ?float { return strpos($val, "%") === false ? $this->single_length_in_pt($val) : null; } /** * @param string $val * @return float|null */ protected function compute_length_positive(string $val): ?float { $computed = $this->compute_length($val); // Negative non-`calc` values are invalid if ($computed === null || ($computed < 0 && !preg_match("/^-?[_a-zA-Z]/", $val)) ) { return null; } return $computed; } /** * @param string $val * @return float|string|null */ protected function compute_length_percentage(string $val) { // Compute with a fixed ref size to decide whether percentage values // are valid $computed = $this->single_length_in_pt($val, 12); if ($computed === null) { return null; } // Retain valid percentage declarations return strpos($val, "%") === false ? $computed : $val; } /** * @param string $val * @return float|string|null */ protected function compute_length_percentage_positive(string $val) { // Compute with a fixed ref size to decide whether percentage values // are valid $computed = $this->single_length_in_pt($val, 12); // Negative non-`calc` values are invalid if ($computed === null || ($computed < 0 && !preg_match("/^-?[_a-zA-Z]/", $val)) ) { return null; } // Retain valid percentage declarations return strpos($val, "%") === false ? $computed : $val; } /** * @param string $val * @param string $style_prop The corresponding border-/outline-style property. * * @return float|null * * @link https://www.w3.org/TR/css-backgrounds-3/#typedef-line-width */ protected function compute_line_width(string $val, string $style_prop): ?float { $val = strtolower($val); // Border-width keywords if ($val === "thin") { $computed = 0.5; } elseif ($val === "medium") { $computed = 1.5; } elseif ($val === "thick") { $computed = 2.5; } else { $computed = $this->compute_length_positive($val); } if ($computed === null) { return null; } // Computed width is 0 if the line style is `none` or `hidden` // https://www.w3.org/TR/css-backgrounds-3/#border-width // https://www.w3.org/TR/css-ui-4/#outline-width $lineStyle = $this->__get($style_prop); $hasLineStyle = $lineStyle !== "none" && $lineStyle !== "hidden"; return $hasLineStyle ? $computed : 0.0; } /** * @param string $val * @return string|null */ protected function compute_border_style(string $val): ?string { $val = strtolower($val); return \in_array($val, self::BORDER_STYLES, true) ? $val : null; } /** * @param string $val * @return float|null * * @link https://www.w3.org/TR/css3-values/#angles */ protected function compute_angle_or_zero(string $val): ?float { $number = self::CSS_NUMBER; $pattern = "/^($number)(deg|grad|rad|turn)?$/i"; if (!preg_match($pattern, $val, $matches)) { return null; } $v = (float) $matches[1]; $unit = strtolower($matches[2] ?? ""); switch ($unit) { case "deg": return $v; case "grad": return $v * 0.9; case "rad": return rad2deg($v); case "turn": return $v * 360; default: return $v === 0.0 ? $v : null; } } /** * Common computation logic for `background-position` and `transform-origin`. * * @param string $v1 * @param string $v2 * * @return (float|string|null)[] */ protected function computeBackgroundPositionTransformOrigin(string $v1, string $v2): array { $x = null; $y = null; switch ($v1) { case "left": $x = 0.0; break; case "right": $x = "100%"; break; case "top": $y = 0.0; break; case "bottom": $y = "100%"; break; case "center": if ($v2 === "left" || $v2 === "right") { $y = "50%"; } else { $x = "50%"; } break; default: $x = $this->compute_length_percentage($v1); break; } switch ($v2) { case "left": $x = 0.0; break; case "right": $x = "100%"; break; case "top": $y = 0.0; break; case "bottom": $y = "100%"; break; case "center": if ($v1 === "top" || $v1 === "bottom") { $x = "50%"; } else { $y = "50%"; } break; default: $y = $this->compute_length_percentage($v2); break; } return [$x, $y]; } /** * @link https://www.w3.org/TR/css-lists-3/#typedef-counter-name */ protected function isValidCounterName(string $name): bool { return $name !== "none" && !in_array($name, self::CUSTOM_IDENT_FORBIDDEN, true); } /** * @link https://www.w3.org/TR/css-counter-styles-3/#typedef-counter-style-name */ protected function isValidCounterStyleName(string $name): bool { return $name !== "none" && !in_array($name, self::CUSTOM_IDENT_FORBIDDEN, true); } /** * Parse a property value with 1 to 4 components into 4 values, as required * by shorthand properties such as `margin`, `padding`, and `border-radius`. * * @param string $prop The shorthand property with exactly 4 sub-properties to handle. * @param string $value The property value to parse. * * @return string[] */ protected function set_quad_shorthand(string $prop, string $value): array { $v = $this->parse_property_value($value); switch (\count($v)) { case 1: $values = [$v[0], $v[0], $v[0], $v[0]]; break; case 2: $values = [$v[0], $v[1], $v[0], $v[1]]; break; case 3: $values = [$v[0], $v[1], $v[2], $v[1]]; break; case 4: $values = [$v[0], $v[1], $v[2], $v[3]]; break; default: return []; } return array_combine(self::$_props_shorthand[$prop], $values); } /*======================*/ /** * @link https://www.w3.org/TR/CSS21/visuren.html#display-prop */ protected function _compute_display(string $val) { $val = strtolower($val); // Make sure that common valid, but unsupported display types have an // appropriate fallback display type switch ($val) { case "flow-root": case "flex": case "grid": case "table-caption": $val = "block"; break; case "inline-flex": case "inline-grid": $val = "inline-block"; break; } if (!isset(self::$valid_display_types[$val])) { return null; } // https://www.w3.org/TR/CSS21/visuren.html#dis-pos-flo if ($this->is_in_flow()) { return $val; } else { switch ($val) { case "inline": case "inline-block": // case "table-row-group": // case "table-header-group": // case "table-footer-group": // case "table-row": // case "table-cell": // case "table-column-group": // case "table-column": // case "table-caption": return "block"; case "inline-table": return "table"; default: return $val; } } } /** * @link https://www.w3.org/TR/CSS21/colors.html#propdef-color */ protected function _compute_color(string $color) { return $this->compute_color_value($color); } /** * @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-color */ protected function _compute_background_color(string $color) { return $this->compute_color_value($color); } /** * @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-image */ protected function _compute_background_image(string $val) { $parsed_val = $this->_stylesheet->resolve_url($val); if ($parsed_val === "none") { return "none"; } else { return "url(\"" . str_replace("\"", "\\\"", $parsed_val) . "\")"; } } /** * @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-repeat */ protected function _compute_background_repeat(string $val) { $keywords = ["repeat", "repeat-x", "repeat-y", "no-repeat"]; $val = strtolower($val); return \in_array($val, $keywords, true) ? $val : null; } /** * @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-attachment */ protected function _compute_background_attachment(string $val) { $keywords = ["scroll", "fixed"]; $val = strtolower($val); return \in_array($val, $keywords, true) ? $val : null; } /** * @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-position */ protected function _compute_background_position(string $val) { $val = strtolower($val); $parts = $this->parse_property_value($val); $count = \count($parts); if ($count === 0 || $count > 2) { return null; } $v1 = $parts[0]; $v2 = $parts[1] ?? "center"; [$x, $y] = $this->computeBackgroundPositionTransformOrigin($v1, $v2); if ($x === null || $y === null) { return null; } return [$x, $y]; } /** * Compute `background-size`. * * Computes to one of the following values: * * `cover` * * `contain` * * `[width, height]`, each being a length, percentage, or `auto` * * @link https://www.w3.org/TR/css-backgrounds-3/#background-size */ protected function _compute_background_size(string $val) { $val = strtolower($val); if ($val === "cover" || $val === "contain") { return $val; } $parts = $this->parse_property_value($val); $count = \count($parts); if ($count === 0 || $count > 2) { return null; } $width = $parts[0]; if ($width !== "auto") { $width = $this->compute_length_percentage_positive($width); } $height = $parts[1] ?? "auto"; if ($height !== "auto") { $height = $this->compute_length_percentage_positive($height); } if ($width === null || $height === null) { return null; } return [$width, $height]; } /** * @link https://www.w3.org/TR/css-backgrounds-3/#propdef-background */ protected function _set_background(string $value): array { $components = $this->parse_property_value($value); $props = []; $pos_size = []; foreach ($components as $val) { $lower = strtolower($val); if ($lower === "none") { $props["background_image"] = $lower; } elseif (strncmp($lower, "url(", 4) === 0) { $props["background_image"] = $val; } elseif ($lower === "scroll" || $lower === "fixed") { $props["background_attachment"] = $lower; } elseif ($lower === "repeat" || $lower === "repeat-x" || $lower === "repeat-y" || $lower === "no-repeat") { $props["background_repeat"] = $lower; } elseif ($this->is_color_value($lower)) { $props["background_color"] = $lower; } else { $pos_size[] = $lower; } } if (\count($pos_size)) { // Split value list at "/" $index = array_search("/", $pos_size, true); if ($index !== false) { $pos = \array_slice($pos_size, 0, $index); $size = \array_slice($pos_size, $index + 1); } else { $pos = $pos_size; $size = []; } $props["background_position"] = implode(" ", $pos); if (\count($size)) { $props["background_size"] = implode(" ", $size); } } return $props; } /** * @link https://www.w3.org/TR/CSS21/fonts.html#propdef-font-family */ protected function _compute_font_family(string $val) { return array_map( function ($name) { return trim($name, " '\""); }, preg_split("/\s*,\s*/", $val) ); } /** * @link https://www.w3.org/TR/CSS21/fonts.html#propdef-font-size */ protected function _compute_font_size(string $val) { $val = strtolower($val); $parentFontSize = isset($this->parent_style) ? $this->parent_style->__get("font_size") : self::$default_font_size; switch ($val) { case "xx-small": case "x-small": case "small": case "medium": case "large": case "x-large": case "xx-large": $computed = self::$default_font_size * self::$font_size_keywords[$val]; break; case "smaller": $computed = 8 / 9 * $parentFontSize; break; case "larger": $computed = 6 / 5 * $parentFontSize; break; default: $computed = $this->single_length_in_pt($val, $parentFontSize, $parentFontSize); // Negative non-`calc` values are invalid if ($computed === null || ($computed < 0 && !preg_match("/^-?[_a-zA-Z]/", $val)) ) { return null; } break; } return $computed; } /** * @link https://www.w3.org/TR/CSS21/fonts.html#propdef-font-style */ protected function _compute_font_style(string $val) { $val = strtolower($val); return $val === "normal" || $val === "italic" || $val === "oblique" ? $val : null; } /** * @link https://www.w3.org/TR/css-fonts-4/#propdef-font-weight */ protected function _compute_font_weight(string $val) { $val = strtolower($val); switch ($val) { case "normal": return 400; case "bold": return 700; case "bolder": // https://www.w3.org/TR/css-fonts-4/#relative-weights $w = isset($this->parent_style) ? $this->parent_style->__get("font_weight") : 400; if ($w < 350) { return 400; } elseif ($w < 550) { return 700; } elseif ($w < 900) { return 900; } else { return $w; } case "lighter": // https://www.w3.org/TR/css-fonts-4/#relative-weights $w = isset($this->parent_style) ? $this->parent_style->__get("font_weight") : 400; if ($w < 100) { return $w; } elseif ($w < 550) { return 100; } elseif ($w < 750) { return 400; } else { return 700; } default: $number = self::CSS_NUMBER; $weight = preg_match("/^$number$/", $val) ? (int) $val : null; return $weight !== null && $weight >= 1 && $weight <= 1000 ? $weight : null; } } /** * @link https://www.w3.org/TR/css-fonts-4/#src-desc */ protected function _compute_src(string $val) { return $val; } /** * Handle the `font` shorthand property. * * `[ font-style || font-variant || font-weight ] font-size [ / line-height ] font-family` * * @link https://www.w3.org/TR/CSS21/fonts.html#font-shorthand */ protected function _set_font(string $value): array { $value = strtolower($value); $components = $this->parse_property_value($value); $props = []; $number = self::CSS_NUMBER; $unit = "pt|px|pc|rem|em|ex|in|cm|mm|%"; $sizePattern = "/^(xx-small|x-small|small|medium|large|x-large|xx-large|smaller|larger|$number(?:$unit)|0)$/"; $sizeIndex = null; // Find index of font-size to split the component list foreach ($components as $i => $val) { if (preg_match($sizePattern, $val)) { $sizeIndex = $i; $props["font_size"] = $val; break; } } // `font-size` is mandatory if ($sizeIndex === null) { return []; } // `font-style`, `font-variant`, `font-weight` in any order $styleVariantWeight = \array_slice($components, 0, $sizeIndex); $stylePattern = "/^(italic|oblique)$/"; $variantPattern = "/^(small-caps)$/"; $weightPattern = "/^(bold|bolder|lighter|$number)$/"; if (\count($styleVariantWeight) > 3) { return []; } foreach ($styleVariantWeight as $val) { if ($val === "normal") { // Ignore any `normal` value, as it is valid and the initial // value for all three properties } elseif (!isset($props["font_style"]) && preg_match($stylePattern, $val)) { $props["font_style"] = $val; } elseif (!isset($props["font_variant"]) && preg_match($variantPattern, $val)) { $props["font_variant"] = $val; } elseif (!isset($props["font_weight"]) && preg_match($weightPattern, $val)) { $props["font_weight"] = $val; } else { // Duplicates and other values disallowed here return []; } } // Optional slash + `line-height` followed by mandatory `font-family` $lineFamily = \array_slice($components, $sizeIndex + 1); $hasLineHeight = $lineFamily !== [] && $lineFamily[0] === "/"; $lineHeight = $hasLineHeight ? \array_slice($lineFamily, 1, 1) : []; $fontFamily = $hasLineHeight ? \array_slice($lineFamily, 2) : $lineFamily; $lineHeightPattern = "/^(normal|$number(?:$unit)?)$/"; // Missing `font-family` or `line-height` after slash if ($fontFamily === [] || ($hasLineHeight && !preg_match($lineHeightPattern, $lineHeight[0])) ) { return []; } if ($hasLineHeight) { $props["line_height"] = $lineHeight[0]; } $props["font_family"] = implode("", $fontFamily); return $props; } /** * Compute `text-align`. * * If no alignment is set on the element and the direction is rtl then * the property is set to "right", otherwise it is set to "left". * * @link https://www.w3.org/TR/CSS21/text.html#propdef-text-align */ protected function _compute_text_align(string $val) { $alignment = strtolower($val); if ($alignment === "") { $alignment = $this->__get("direction") === "rtl" ? "right" : "left"; } if (!\in_array($alignment, self::TEXT_ALIGN_KEYWORDS, true)) { return null; } return $alignment; } /** * @link https://www.w3.org/TR/css-text-4/#word-spacing-property */ protected function _compute_word_spacing(string $val) { $val = strtolower($val); if ($val === "normal") { return 0.0; } return $this->compute_length_percentage($val); } /** * @link https://www.w3.org/TR/css-text-4/#letter-spacing-property */ protected function _compute_letter_spacing(string $val) { $val = strtolower($val); if ($val === "normal") { return 0.0; } return $this->compute_length_percentage($val); } /** * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-line-height */ protected function _compute_line_height(string $val) { $val = strtolower($val); if ($val === "normal") { return $val; } // Compute number values to string and lengths to float (in pt) if (is_numeric($val)) { return (string) $val; } $font_size = $this->__get("font_size"); $computed = $this->single_length_in_pt($val, $font_size); // Negative non-`calc` values are invalid if ($computed === null || ($computed < 0 && !preg_match("/^-?[_a-zA-Z]/", $val)) ) { return null; } return $computed; } /** * @link https://www.w3.org/TR/css-text-3/#text-indent-property */ protected function _compute_text_indent(string $val) { return $this->compute_length_percentage($val); } /** * @link https://www.w3.org/TR/CSS21/page.html#propdef-page-break-before */ protected function _compute_page_break_before(string $val) { $break = strtolower($val); if ($break === "left" || $break === "right") { $break = "always"; } return $break; } /** * @link https://www.w3.org/TR/CSS21/page.html#propdef-page-break-after */ protected function _compute_page_break_after(string $val) { $break = strtolower($val); if ($break === "left" || $break === "right") { $break = "always"; } return $break; } /** * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-width */ protected function _compute_width(string $val) { $val = strtolower($val); if ($val === "auto") { return $val; } return $this->compute_length_percentage_positive($val); } /** * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-height */ protected function _compute_height(string $val) { $val = strtolower($val); if ($val === "auto") { return $val; } return $this->compute_length_percentage_positive($val); } /** * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-min-width */ protected function _compute_min_width(string $val) { $val = strtolower($val); // Legacy support for `none`, not covered by spec if ($val === "auto" || $val === "none") { return "auto"; } return $this->compute_length_percentage_positive($val); } /** * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-min-height */ protected function _compute_min_height(string $val) { $val = strtolower($val); // Legacy support for `none`, not covered by spec if ($val === "auto" || $val === "none") { return "auto"; } return $this->compute_length_percentage_positive($val); } /** * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-max-width */ protected function _compute_max_width(string $val) { $val = strtolower($val); // Legacy support for `auto`, not covered by spec if ($val === "none" || $val === "auto") { return "none"; } return $this->compute_length_percentage_positive($val); } /** * @link https://www.w3.org/TR/CSS21/visudet.html#propdef-max-height */ protected function _compute_max_height(string $val) { $val = strtolower($val); // Legacy support for `auto`, not covered by spec if ($val === "none" || $val === "auto") { return "none"; } return $this->compute_length_percentage_positive($val); } /** * @link https://www.w3.org/TR/css-position-3/#inset-properties * @link https://www.w3.org/TR/css-position-3/#propdef-inset */ protected function _set_inset(string $val): array { return $this->set_quad_shorthand("inset", $val); } /** * @param string $val * @return float|string|null */ protected function compute_box_inset(string $val) { $val = strtolower($val); if ($val === "auto") { return $val; } return $this->compute_length_percentage($val); } protected function _compute_top(string $val) { return $this->compute_box_inset($val); } protected function _compute_right(string $val) { return $this->compute_box_inset($val); } protected function _compute_bottom(string $val) { return $this->compute_box_inset($val); } protected function _compute_left(string $val) { return $this->compute_box_inset($val); } /** * @link https://www.w3.org/TR/CSS21/box.html#margin-properties * @link https://www.w3.org/TR/CSS21/box.html#propdef-margin */ protected function _set_margin(string $val): array { return $this->set_quad_shorthand("margin", $val); } /** * @param string $val * @return float|string|null */ protected function compute_margin(string $val) { $val = strtolower($val); // Legacy support for `none` keyword, not covered by spec if ($val === "none") { return 0.0; } if ($val === "auto") { return $val; } return $this->compute_length_percentage($val); } protected function _compute_margin_top(string $val) { return $this->compute_margin($val); } protected function _compute_margin_right(string $val) { return $this->compute_margin($val); } protected function _compute_margin_bottom(string $val) { return $this->compute_margin($val); } protected function _compute_margin_left(string $val) { return $this->compute_margin($val); } /** * @link https://www.w3.org/TR/CSS21/box.html#padding-properties * @link https://www.w3.org/TR/CSS21/box.html#propdef-padding */ protected function _set_padding(string $val): array { return $this->set_quad_shorthand("padding", $val); } /** * @param string $val * @return float|string|null */ protected function compute_padding(string $val) { $val = strtolower($val); // Legacy support for `none` keyword, not covered by spec if ($val === "none") { return 0.0; } return $this->compute_length_percentage_positive($val); } protected function _compute_padding_top(string $val) { return $this->compute_padding($val); } protected function _compute_padding_right(string $val) { return $this->compute_padding($val); } protected function _compute_padding_bottom(string $val) { return $this->compute_padding($val); } protected function _compute_padding_left(string $val) { return $this->compute_padding($val); } /** * @param string $value `width || style || color` * @param string[] $styles The list of border styles to accept. * * @return string[]|null Array of `[width, style, color]`, or `null` if the declaration is invalid. */ protected function parse_border_side(string $value, array $styles = self::BORDER_STYLES): ?array { $value = strtolower($value); $components = $this->parse_property_value($value); $width = null; $style = null; $color = null; foreach ($components as $val) { if ($style === null && \in_array($val, $styles, true)) { $style = $val; } elseif ($color === null && $this->is_color_value($val)) { $color = $val; } elseif ($width === null) { // Assume width $width = $val; } else { // Duplicates are not allowed return null; } } return [$width, $style, $color]; } /** * @link https://www.w3.org/TR/CSS21/box.html#border-properties * @link https://www.w3.org/TR/CSS21/box.html#propdef-border */ protected function _set_border(string $value): array { $values = $this->parse_border_side($value); if ($values === null) { return []; } return array_merge( array_combine(self::$_props_shorthand["border_top"], $values), array_combine(self::$_props_shorthand["border_right"], $values), array_combine(self::$_props_shorthand["border_bottom"], $values), array_combine(self::$_props_shorthand["border_left"], $values) ); } /** * @param string $prop * @param string $value * @return array */ protected function set_border_side(string $prop, string $value): array { $values = $this->parse_border_side($value); if ($values === null) { return []; } return array_combine(self::$_props_shorthand[$prop], $values); } protected function _set_border_top(string $val): array { return $this->set_border_side("border_top", $val); } protected function _set_border_right(string $val): array { return $this->set_border_side("border_right", $val); } protected function _set_border_bottom(string $val): array { return $this->set_border_side("border_bottom", $val); } protected function _set_border_left(string $val): array { return $this->set_border_side("border_left", $val); } /** * @link https://www.w3.org/TR/CSS21/box.html#propdef-border-color */ protected function _set_border_color(string $val): array { return $this->set_quad_shorthand("border_color", $val); } protected function _compute_border_top_color(string $val) { return $this->compute_color_value($val); } protected function _compute_border_right_color(string $val) { return $this->compute_color_value($val); } protected function _compute_border_bottom_color(string $val) { return $this->compute_color_value($val); } protected function _compute_border_left_color(string $val) { return $this->compute_color_value($val); } /** * @link https://www.w3.org/TR/CSS21/box.html#propdef-border-style */ protected function _set_border_style(string $val): array { return $this->set_quad_shorthand("border_style", $val); } protected function _compute_border_top_style(string $val) { return $this->compute_border_style($val); } protected function _compute_border_right_style(string $val) { return $this->compute_border_style($val); } protected function _compute_border_bottom_style(string $val) { return $this->compute_border_style($val); } protected function _compute_border_left_style(string $val) { return $this->compute_border_style($val); } /** * @link https://www.w3.org/TR/CSS21/box.html#propdef-border-width */ protected function _set_border_width(string $val): array { return $this->set_quad_shorthand("border_width", $val); } protected function _compute_border_top_width(string $val) { return $this->compute_line_width($val, "border_top_style"); } protected function _compute_border_right_width(string $val) { return $this->compute_line_width($val, "border_right_style"); } protected function _compute_border_bottom_width(string $val) { return $this->compute_line_width($val, "border_bottom_style"); } protected function _compute_border_left_width(string $val) { return $this->compute_line_width($val, "border_left_style"); } /** * @link https://www.w3.org/TR/css-backgrounds-3/#corners * @link https://www.w3.org/TR/css-backgrounds-3/#propdef-border-radius */ protected function _set_border_radius(string $val): array { return $this->set_quad_shorthand("border_radius", $val); } protected function _compute_border_top_left_radius(string $val) { return $this->compute_length_percentage_positive($val); } protected function _compute_border_top_right_radius(string $val) { return $this->compute_length_percentage_positive($val); } protected function _compute_border_bottom_right_radius(string $val) { return $this->compute_length_percentage_positive($val); } protected function _compute_border_bottom_left_radius(string $val) { return $this->compute_length_percentage_positive($val); } /** * @link https://www.w3.org/TR/css-ui-4/#outline-props * @link https://www.w3.org/TR/css-ui-4/#propdef-outline */ protected function _set_outline(string $value): array { $values = $this->parse_border_side($value, self::OUTLINE_STYLES); if ($values === null) { return []; } return array_combine(self::$_props_shorthand["outline"], $values); } protected function _compute_outline_color(string $val) { return $this->compute_color_value($val); } protected function _compute_outline_style(string $val) { $val = strtolower($val); return \in_array($val, self::OUTLINE_STYLES, true) ? $val : null; } protected function _compute_outline_width(string $val) { return $this->compute_line_width($val, "outline_style"); } /** * @link https://www.w3.org/TR/css-ui-4/#propdef-outline-offset */ protected function _compute_outline_offset(string $val) { return $this->compute_length($val); } /** * Compute `border-spacing` to two lengths of the form * `[horizontal, vertical]`. * * @link https://www.w3.org/TR/CSS21/tables.html#propdef-border-spacing */ protected function _compute_border_spacing(string $val) { $val = strtolower($val); $parts = $this->parse_property_value($val); $count = \count($parts); if ($count === 0 || $count > 2) { return null; } $h = $this->compute_length_positive($parts[0]); $v = isset($parts[1]) ? $this->compute_length_positive($parts[1]) : $h; if ($h === null || $v === null) { return null; } return [$h, $v]; } /** * @link https://www.w3.org/TR/CSS21/generate.html#propdef-list-style-image */ protected function _compute_list_style_image(string $val) { $parsed_val = $this->_stylesheet->resolve_url($val); if ($parsed_val === "none") { return "none"; } else { return "url(\"" . str_replace("\"", "\\\"", $parsed_val) . "\")"; } } /** * @link https://www.w3.org/TR/CSS21/generate.html#propdef-list-style-type */ protected function _compute_list_style_position(string $val) { $val = strtolower($val); return $val === "inside" || $val === "outside" ? $val : null; } /** * @link https://www.w3.org/TR/CSS21/generate.html#propdef-list-style-type */ protected function _compute_list_style_type(string $val) { $val = strtolower($val); if ($val === "none") { return $val; } $ident = self::CSS_IDENTIFIER; return $val !== "default" && preg_match("/^$ident$/", $val) ? $val : null; } /** * Handle the `list-style` shorthand property. * * `[ list-style-position || list-style-image || list-style-type ]` * * @link https://www.w3.org/TR/css-lists-3/#list-style-property */ protected function _set_list_style(string $value): array { $components = $this->parse_property_value($value); $none = 0; $position = null; $image = null; $type = null; foreach ($components as $val) { $lower = strtolower($val); // `none` can occur max 2 times (for image and type each) if ($none < 2 && $lower === "none") { $none++; } elseif ($position === null && ($lower === "inside" || $lower === "outside")) { $position = $lower; } elseif ($image === null && strncmp($lower, "url(", 4) === 0) { $image = $val; } elseif ($type === null) { $type = $val; } else { // Duplicates are not allowed return []; } } // From the spec: // Using a value of `none` in the shorthand is potentially ambiguous, as // `none` is a valid value for both `list-style-image` and `list-style-type`. // To resolve this ambiguity, a value of `none` in the shorthand must be // applied to whichever of the two properties aren’t otherwise set by // the shorthand. if ($none === 2) { if ($image !== null || $type !== null) { return []; } $image = "none"; $type = "none"; } elseif ($none === 1) { if ($image !== null && $type !== null) { return []; } $image = $image ?? "none"; $type = $type ?? "none"; } return [ "list_style_position" => $position, "list_style_image" => $image, "list_style_type" => $type ]; } /** * @param string $value * @param int $default * @param bool $sumDuplicates * * @return array|string|null */ protected function compute_counter_prop(string $value, int $default, bool $sumDuplicates = false) { $lower = strtolower($value); if ($lower === "none") { return $lower; } $ident = self::CSS_IDENTIFIER; $integer = self::CSS_INTEGER; $counterDef = "($ident)(?:\s+($integer))?"; $validationPattern = "/^$counterDef(\s+$counterDef)*$/"; if (!preg_match($validationPattern, $value)) { return null; } preg_match_all("/$counterDef/", $value, $matches, PREG_SET_ORDER); $counters = []; foreach ($matches as $match) { $name = $match[1]; if (!$this->isValidCounterName($name)) { return null; } $value = isset($match[2]) ? (int) $match[2] : $default; $counters[$name] = $sumDuplicates ? ($counters[$name] ?? 0) + $value : $value; } return $counters; } /** * @link https://www.w3.org/TR/CSS21/generate.html#propdef-counter-increment */ protected function _compute_counter_increment(string $val) { return $this->compute_counter_prop($val, 1, true); } /** * @link https://www.w3.org/TR/CSS21/generate.html#propdef-counter-reset */ protected function _compute_counter_reset(string $val) { return $this->compute_counter_prop($val, 0); } /** * @link https://www.w3.org/TR/css-content-3/#quotes */ protected function _compute_quotes(string $val) { $lower = strtolower($val); // `auto` is resolved in the getter, so it can inherit as is if ($lower === "none" || $lower === "auto") { return $lower; } $components = $this->parse_property_value($val); $quotes = []; foreach ($components as $value) { if (strncmp($value, '"', 1) !== 0 && strncmp($value, "'", 1) !== 0 ) { return null; } $quotes[] = $this->_stylesheet->parse_string($value); } if ($quotes === [] || \count($quotes) % 2 !== 0) { return null; } return array_chunk($quotes, 2); } /** * @link https://www.w3.org/TR/CSS21/generate.html#propdef-content * @link https://www.w3.org/TR/css-content-3/#propdef-content */ protected function _compute_content(string $val) { $lower = strtolower($val); if ($lower === "normal" || $lower === "none") { return $lower; } $components = $this->parse_property_value($val); $parts = []; if ($components === []) { return null; } foreach ($components as $value) { // String if (strncmp($value, '"', 1) === 0 || strncmp($value, "'", 1) === 0) { $parts[] = new StringPart($this->_stylesheet->parse_string($value)); continue; } $lower = strtolower($value); // Keywords if ($lower === "open-quote") { $parts[] = new OpenQuote; continue; } elseif ($lower === "close-quote") { $parts[] = new CloseQuote; continue; } elseif ($lower === "no-open-quote") { $parts[] = new NoOpenQuote; continue; } elseif ($lower === "no-close-quote") { $parts[] = new NoCloseQuote; continue; } // Functional components $pos = strpos($lower, "("); if ($pos === false) { return null; } // `parse_property_value` ensures that the value is of the form // `function(arguments)` at this point $function = substr($lower, 0, $pos); $arguments = trim(substr($value, $pos + 1, -1)); // attr() if ($function === "attr") { $attr = strtolower($arguments); if ($attr === "") { return null; } $parts[] = new Attr($attr); } // counter(name [, style]) elseif ($function === "counter") { $ident = self::CSS_IDENTIFIER; if (!preg_match("/^($ident)(?:\s*,\s*($ident))?$/", $arguments, $matches)) { return null; } $name = $matches[1]; $type = isset($matches[2]) ? strtolower($matches[2]) : "decimal"; if (!$this->isValidCounterName($name) || !$this->isValidCounterStyleName($type) ) { return null; } $parts[] = new Counter($name, $type); } // counters(name, string [, style]) elseif ($function === "counters") { $ident = self::CSS_IDENTIFIER; $string = self::CSS_STRING; if (!preg_match("/^($ident)\s*,\s*($string)(?:\s*,\s*($ident))?$/", $arguments, $matches)) { return null; } $name = $matches[1]; $string = $this->_stylesheet->parse_string($matches[2]); $type = isset($matches[3]) ? strtolower($matches[3]) : "decimal"; if (!$this->isValidCounterName($name) || !$this->isValidCounterStyleName($type) ) { return null; } $parts[] = new Counters($name, $string, $type); } // url() elseif ($function === "url") { $url = $this->_stylesheet->parse_string($arguments); $parts[] = new Url($url); } else { return null; } } return $parts; } /** * @link https://www.w3.org/TR/css-page-3/#page-size-prop */ protected function _compute_size(string $val) { $val = strtolower($val); if ($val === "auto") { return $val; } $parts = $this->parse_property_value($val); $count = \count($parts); if ($count === 0 || $count > 3) { return null; } $size = null; $orientation = null; $lengths = []; foreach ($parts as $part) { if ($size === null && isset(CPDF::$PAPER_SIZES[$part])) { $size = $part; } elseif ($orientation === null && ($part === "portrait" || $part === "landscape")) { $orientation = $part; } else { $lengths[] = $part; } } if ($size !== null && $lengths !== []) { return null; } if ($size !== null) { // Standard paper size [$l1, $l2] = \array_slice(CPDF::$PAPER_SIZES[$size], 2, 2); } elseif ($lengths === []) { // Orientation only, use default paper size $dims = $this->_stylesheet->get_dompdf()->getPaperSize(); [$l1, $l2] = \array_slice($dims, 2, 2); } else { // Custom paper size $l1 = $this->compute_length_positive($lengths[0]); $l2 = isset($lengths[1]) ? $this->compute_length_positive($lengths[1]) : $l1; if ($l1 === null || $l2 === null) { return null; } } if (($orientation === "portrait" && $l1 > $l2) || ($orientation === "landscape" && $l2 > $l1) ) { return [$l2, $l1]; } return [$l1, $l2]; } /** * @link https://www.w3.org/TR/css-transforms-1/#transform-property */ protected function _compute_transform(string $val) { $val = strtolower($val); if ($val === "none") { return []; } $parts = $this->parse_property_value($val); $transforms = []; if ($parts === []) { return null; } foreach ($parts as $part) { if (!preg_match("/^([a-z]+)\((.+)\)$/s", $part, $matches)) { return null; } $name = $matches[1]; $arguments = trim($matches[2]); $values = $this->parse_property_value($arguments); $values = array_values(array_filter($values, function ($v) { return $v !== ","; })); $count = \count($values); if ($count === 0) { return null; } switch ($name) { // case "matrix": // if ($count !== 6) { // return null; // } // $values = array_map([$this, "compute_number"], $values); // break; // <length-percentage> units case "translate": if ($count > 2) { return null; } $values = [ $this->compute_length_percentage($values[0]), isset($values[1]) ? $this->compute_length_percentage($values[1]) : 0.0 ]; break; case "translatex": if ($count > 1) { return null; } $name = "translate"; $values = [$this->compute_length_percentage($values[0]), 0.0]; break; case "translatey": if ($count > 1) { return null; } $name = "translate"; $values = [0.0, $this->compute_length_percentage($values[0])]; break; // <number> units case "scale": if ($count > 2) { return null; } $v0 = $this->compute_number($values[0]); $v1 = isset($values[1]) ? $this->compute_number($values[1]) : $v0; $values = [$v0, $v1]; break; case "scalex": if ($count > 1) { return null; } $name = "scale"; $values = [$this->compute_number($values[0]), 1.0]; break; case "scaley": if ($count > 1) { return null; } $name = "scale"; $values = [1.0, $this->compute_number($values[0])]; break; // <angle> units case "rotate": if ($count > 1) { return null; } $values = [$this->compute_angle_or_zero($values[0])]; break; case "skew": if ($count > 2) { return null; } $values = [ $this->compute_angle_or_zero($values[0]), isset($values[1]) ? $this->compute_angle_or_zero($values[1]) : 0.0 ]; break; case "skewx": if ($count > 1) { return null; } $name = "skew"; $values = [$this->compute_angle_or_zero($values[0]), 0.0]; break; case "skewy": if ($count > 1) { return null; } $name = "skew"; $values = [0.0, $this->compute_angle_or_zero($values[0])]; break; default: return null; } foreach ($values as $v) { if ($v === null) { return null; } } $transforms[] = [$name, $values]; } return $transforms; } /** * @link https://www.w3.org/TR/css-transforms-1/#transform-origin-property */ protected function _compute_transform_origin(string $val) { $val = strtolower($val); $parts = $this->parse_property_value($val); $count = \count($parts); if ($count === 0 || $count > 3) { return null; } $v1 = $parts[0]; $v2 = $parts[1] ?? "center"; [$x, $y] = $this->computeBackgroundPositionTransformOrigin($v1, $v2); $z = $count === 3 ? $this->compute_length($parts[2]) : 0.0; if ($x === null || $y === null || $z === null) { return null; } return [$x, $y, $z]; } /** * @param string $val * @return string|null */ protected function parse_image_resolution(string $val): ?string { // If exif data could be get: // $re = '/^\s*(\d+|normal|auto)(?:\s*,\s*(\d+|normal))?\s*$/'; $val = strtolower($val); $re = '/^\s*(\d+|normal|auto)\s*$/'; if (!preg_match($re, $val, $matches)) { return null; } return $matches[1]; } /** * auto | normal | dpi */ protected function _compute_background_image_resolution(string $val) { return $this->parse_image_resolution($val); } /** * auto | normal | dpi */ protected function _compute_image_resolution(string $val) { return $this->parse_image_resolution($val); } /** * @link https://www.w3.org/TR/css-break-3/#propdef-orphans */ protected function _compute_orphans(string $val) { return $this->compute_integer($val); } /** * @link https://www.w3.org/TR/css-break-3/#propdef-widows */ protected function _compute_widows(string $val) { return $this->compute_integer($val); } /** * @link https://www.w3.org/TR/css-color-4/#propdef-opacity */ protected function _compute_opacity(string $val) { $number = self::CSS_NUMBER; $pattern = "/^($number)(%?)$/"; if (!preg_match($pattern, $val, $matches)) { return null; } $v = (float) $matches[1]; $percent = $matches[2] === "%"; $opacity = $percent ? ($v / 100) : $v; return max(0.0, min($opacity, 1.0)); } /** * @link https://www.w3.org/TR/CSS21//visuren.html#propdef-z-index */ protected function _compute_z_index(string $val) { $val = strtolower($val); if ($val === "auto") { return $val; } return $this->compute_integer($val); } /** * @param FontMetrics $fontMetrics * @return $this */ public function setFontMetrics(FontMetrics $fontMetrics) { $this->fontMetrics = $fontMetrics; return $this; } /** * @return FontMetrics */ public function getFontMetrics() { return $this->fontMetrics; } /** * Generate a string representation of the Style * * This dumps the entire property array into a string via print_r. Useful * for debugging. * * @return string */ /*DEBUGCSS print: see below additional debugging util*/ public function __toString(): string { $parent_font_size = $this->parent_style ? $this->parent_style->font_size : self::$default_font_size; return print_r(array_merge(["parent_font_size" => $parent_font_size], $this->_props), true); } /*DEBUGCSS*/ public function debug_print(): void { $parent_font_size = $this->parent_style ? $this->parent_style->font_size : self::$default_font_size; print " parent_font_size:" . $parent_font_size . ";\n"; print " Props [\n"; print " specified [\n"; foreach ($this->_props as $prop => $val) { print ' ' . $prop . ': ' . preg_replace("/\r\n/", ' ', print_r($val, true)); if (isset($this->_important_props[$prop])) { print ' !important'; } print ";\n"; } print " ]\n"; print " computed [\n"; foreach ($this->_props_computed as $prop => $val) { print ' ' . $prop . ': ' . preg_replace("/\r\n/", ' ', print_r($val, true)); print ";\n"; } print " ]\n"; print " cached [\n"; foreach ($this->_props_used as $prop => $val) { print ' ' . $prop . ': ' . preg_replace("/\r\n/", ' ', print_r($val, true)); print ";\n"; } print " ]\n"; print " ]\n"; } }