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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\Exception;
use Dompdf\FontMetrics;
use Dompdf\Frame;
/**
* 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
* @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 string[]|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
* @property string $font_variant
* @property string $font_weight
* @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
* @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 string $quotes
* @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
* @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+)?";
/**
* 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
*/
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
*/
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
*/
protected static $_defaults = null;
/**
* List of inherited properties
*
* @link https://www.w3.org/TR/CSS21/propidx.html
*
* @var array
*/
protected static $_inherited = null;
/**
* Caches method_exists result
*
* @var array<bool>
*/
protected static $_methods_cache = [];
/**
* The stylesheet this style belongs to
*
* @var Stylesheet
*/
protected $_stylesheet;
/**
* Media queries attached to the style
*
* @var array
*/
protected $_media_queries;
/**
* Properties set by an `!important` declaration.
*
* @var array
*/
protected $_important_props = [];
/**
* Specified (or declared) values of the CSS properties.
*
* https://www.w3.org/TR/css-cascade-3/#value-stages
*
* @var array
*/
protected $_props = [];
/**
* Computed values of the CSS properties.
*
* @var array
*/
protected $_props_computed = [];
/**
* Used values of the CSS properties.
*
* @var array
*/
protected $_props_used = [];
/**
* Marks properties with non-final used values that should be cleared on
* style reset.
*
* @var array
*/
protected $non_final_used = [];
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
*/
protected static $_dependent_props = [];
/**
* 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%"];
$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"] = "normal";
$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"] = "none";
$d["transform_origin"] = "50% 50%";
// for @font-face
$d["src"] = "";
$d["unicode_range"] = "";
// vendor-prefixed properties
$d["_dompdf_keep"] = "";
// Properties that inherit by default
self::$_inherited = [
"azimuth",
"background_image_resolution",
"border_collapse",
"border_spacing",
"caption_side",
"color",
"cursor",
"direction",
"elevation",
"empty_cells",
"font_family",
"font_size",
"font_style",
"font_variant",
"font_weight",
"font",
"image_resolution",
"letter_spacing",
"line_height",
"list_style_image",
"list_style_position",
"list_style_type",
"list_style",
"orphans",
"overflow_wrap",
"pitch_range",
"pitch",
"quotes",
"richness",
"speak_header",
"speak_numeral",
"speak_punctuation",
"speak",
"speech_rate",
"stress",
"text_align",
"text_indent",
"text_transform",
"visibility",
"voice_family",
"volume",
"white_space",
"widows",
"word_break",
"word_spacing",
];
// 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[$val] = true;
}
}
}
/**
* Clear all non-final used values.
*
* @return void
*/
public function reset(): void
{
foreach (array_keys($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_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)(.*)?$/";
if (!preg_match($pattern, $l, $matches)) {
return null;
}
$v = (float) $matches[1];
$unit = mb_strtolower($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;
}
/**
* 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) {
foreach (self::$_inherited as $prop) {
// For properties that inherit by default: When the cascade did
// not result in a value, inherit the parent value. Inheritance
// is handled via the specific sub-properties for shorthands
if (isset($this->_props[$prop]) || isset(self::$_props_shorthand[$prop])) {
continue;
}
if (isset($parent->_props[$prop])) {
$parent_val = $parent->computed($prop);
$this->_props[$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);
$this->_props[$prop] = $parent_val;
$this->_props_computed[$prop] = $parent_val;
$this->_props_used[$prop] = null;
} 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;
}
$this->_props[$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]);
}
}
}
/**
* 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
{
$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;
}
if ($prop !== "content" && \is_string($val) && mb_strpos($val, "url") === false && mb_strlen($val) > 1) {
$val = mb_strtolower(trim(str_replace(["\n", "\t"], [" "], $val)));
}
if (isset(self::$_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";
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, $clear_dependencies);
}
}
}
} else {
// Legacy support for `word-break: break-word`
// https://www.w3.org/TR/css-text-3/#valdef-word-break-break-word
if ($prop === "word_break" && $val === "break-word") {
$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") {
$val = \in_array($prop, self::$_inherited, true)
? "inherit"
: "initial";
}
// https://www.w3.org/TR/css-cascade-3/#valdef-all-initial
if ($val === "initial") {
$val = self::$_defaults[$prop];
}
$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;
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[$prop])) {
throw new Exception("'$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[$prop])) {
throw new Exception("'$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[$prop])) {
throw new Exception("'$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") {
$val = self::$_defaults[$prop];
}
// Check for values which are already computed
if (!\is_string($val)) {
return $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 $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)) {
$val = $this->_props[$prop] ?? self::$_defaults[$prop];
$computed = $this->compute_prop($prop, $val);
$this->_props_computed[$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\"'");
}
/**
* 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: we should be using the calculated prop rather than perform the entire family parsing operation again
$fontMetrics = $this->getFontMetrics();
$DEBUGCSS = $this->_stylesheet->get_dompdf()->getOptions()->getDebugCss();
// Select the appropriate font. First determine the subtype, then check
// the specified font-families for a candidate.
// Resolve font-weight
$weight = $this->__get("font_weight");
if ($weight === 'bold') {
$weight = 700;
} elseif (preg_match('/^[0-9]+$/', $weight, $match)) {
$weight = (int)$match[0];
} else {
$weight = 400;
}
// Resolve font-style
$font_style = $this->__get("font_style");
$subtype = $fontMetrics->getType($weight . ' ' . $font_style);
$families = preg_split("/\s*,\s*/", $computed);
$font = null;
foreach ($families as $family) {
//remove leading and trailing string delimiters, e.g. on font names with spaces;
//remove leading and trailing whitespace
$family = trim($family, " \t\n\r\x0B\"'");
if ($DEBUGCSS) {
print '(' . $family . ')';
}
$font = $fontMetrics->getFont($family, $subtype);
if ($font) {
if ($DEBUGCSS) {
print "<pre>[get_font_family:";
print '(' . $computed . '.' . $font_style . '.' . $weight . '.' . $subtype . ')';
print '(' . $font . ")get_font_family]\n</pre>";
}
return $font;
}
}
$family = null;
if ($DEBUGCSS) {
print '(default)';
}
$font = $fontMetrics->getFont($family, $subtype);
if ($font) {
if ($DEBUGCSS) {
print '(' . $font . ")get_font_family]\n</pre>";
}
return $font;
}
throw new Exception("Unable to find a suitable font replacement for: '" . $computed . "'");
}
/**
* @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)) {
return $computed;
}
$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);
}
/**
* 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);
}
/**
* @param string $value
* @param int $default
*
* @return array|string
*/
protected function parse_counter_prop(string $value, int $default)
{
$ident = self::CSS_IDENTIFIER;
$integer = self::CSS_INTEGER;
$pattern = "/($ident)(?:\s+($integer))?/";
if (!preg_match_all($pattern, $value, $matches, PREG_SET_ORDER)) {
return "none";
}
$counters = [];
foreach ($matches as $match) {
$counter = $match[1];
$value = isset($match[2]) ? (int) $match[2] : $default;
$counters[$counter] = $value;
}
return $counters;
}
/**
* @param string $computed
* @return array|string
*
* @link https://www.w3.org/TR/CSS21/generate.html#propdef-counter-increment
*/
protected function _get_counter_increment($computed)
{
if ($computed === "none") {
return $computed;
}
return $this->parse_counter_prop($computed, 1);
}
/**
* @param string $computed
* @return array|string
*
* @link https://www.w3.org/TR/CSS21/generate.html#propdef-counter-reset
*/
protected function _get_counter_reset($computed)
{
if ($computed === "none") {
return $computed;
}
return $this->parse_counter_prop($computed, 0);
}
/**
* @param string $computed
* @return string[]|string
*
* @link https://www.w3.org/TR/CSS21/generate.html#propdef-content
*/
protected function _get_content($computed)
{
if ($computed === "normal" || $computed === "none") {
return $computed;
}
return $this->parse_property_value($computed);
}
/*==============================*/
/**
* Parse a property value into its components.
*
* @param string $value
*
* @return string[]
*/
protected function parse_property_value(string $value): array
{
$ident = self::CSS_IDENTIFIER;
$number = self::CSS_NUMBER;
$pattern = "/\n" .
"\s* \" ( (?:[^\"]|\\\\[\"])* ) (?<!\\\\)\" |\n" . // String ""
"\s* ' ( (?:[^']|\\\\['])* ) (?<!\\\\)' |\n" . // String ''
"\s* ($ident \\([^)]*\\) ) |\n" . // Functional
"\s* ($ident) |\n" . // Keyword
"\s* (\#[0-9a-fA-F]*) |\n" . // Hex value
"\s* ($number [a-zA-Z%]*) |\n" . // Number (+ unit/percentage)
"\s* ([\/,;]) \n" . // Delimiter
"/Sx";
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
$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_length(string $val): ?float
{
return mb_strpos($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);
return $computed !== null && $computed >= 0 ? $computed : null;
}
/**
* @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 ($computed === null) {
return null;
}
// Retain valid percentage declarations
return mb_strpos($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);
if ($computed === null || $computed < 0) {
return null;
}
// Retain valid percentage declarations
return mb_strpos($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 $style_prop): ?float
{
// Border-width keywords
if ($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 $val): ?string
{
return \in_array($val, self::BORDER_STYLES, true) ? $val : null;
}
/**
* 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 $val)
{
// Make sure that common valid, but unsupported display types have an
// appropriate fallback display type
switch ($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 ($parsed_val === "none") {
return "none";
} else {
return "url($parsed_val)";
}
}
/**
* @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-repeat
*/
protected function _compute_background_repeat(string $val)
{
$keywords = ["repeat", "repeat-x", "repeat-y", "no-repeat"];
return \in_array($val, $keywords, true) ? $val : null;
}
/**
* @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-attachment
*/
protected function _compute_background_attachment(string $val)
{
$keywords = ["scroll", "fixed"];
return \in_array($val, $keywords, true) ? $val : null;
}
/**
* @link https://www.w3.org/TR/CSS21/colors.html#propdef-background-position
*/
protected function _compute_background_position(string $val)
{
$parts = preg_split("/\s+/", $val);
if (\count($parts) > 2) {
return null;
}
switch ($parts[0]) {
case "left":
$x = "0%";
break;
case "right":
$x = "100%";
break;
case "top":
$y = "0%";
break;
case "bottom":
$y = "100%";
break;
case "center":
$x = "50%";
$y = "50%";
break;
default:
$x = $parts[0];
break;
}
if (isset($parts[1])) {
switch ($parts[1]) {
case "left":
$x = "0%";
break;
case "right":
$x = "100%";
break;
case "top":
$y = "0%";
break;
case "bottom":
$y = "100%";
break;
case "center":
if ($parts[0] === "left" || $parts[0] === "right" || $parts[0] === "center") {
$y = "50%";
} else {
$x = "50%";
}
break;
default:
$y = $parts[1];
break;
}
} else {
$y = "50%";
}
if (!isset($x)) {
$x = "0%";
}
if (!isset($y)) {
$y = "0%";
}
return [$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 $val)
{
if ($val === "cover" || $val === "contain") {
return $val;
}
$parts = preg_split("/\s+/", $val);
if (\count($parts) > 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 $val) {
if ($val === "none" || mb_substr($val, 0, 4) === "url(") {
$props["background_image"] = $val;
} elseif ($val === "scroll" || $val === "fixed") {
$props["background_attachment"] = $val;
} elseif ($val === "repeat" || $val === "repeat-x" || $val === "repeat-y" || $val === "no-repeat") {
$props["background_repeat"] = $val;
} elseif ($this->is_color_value($val)) {
$props["background_color"] = $val;
} else {
$pos_size[] = $val;
}
}
if (\count($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-size
*/
protected function _compute_font_size(string $size)
{
$parent_font_size = isset($this->parent_style)
? $this->parent_style->__get("font_size")
: self::$default_font_size;
switch ($size) {
case "xx-small":
case "x-small":
case "small":
case "medium":
case "large":
case "x-large":
case "xx-large":
$fs = self::$default_font_size * self::$font_size_keywords[$size];
break;
case "smaller":
$fs = 8 / 9 * $parent_font_size;
break;
case "larger":
$fs = 6 / 5 * $parent_font_size;
break;
default:
$fs = $this->single_length_in_pt($size, $parent_font_size, $parent_font_size);
break;
}
return $fs;
}
/**
* @link https://www.w3.org/TR/CSS21/fonts.html#font-boldness
*/
protected function _compute_font_weight(string $weight)
{
$computed_weight = $weight;
if ($weight === "bolder") {
//TODO: One font weight heavier than the parent element (among the available weights of the font).
$computed_weight = "bold";
} elseif ($weight === "lighter") {
//TODO: One font weight lighter than the parent element (among the available weights of the font).
$computed_weight = "normal";
}
return $computed_weight;
}
/**
* 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
{
$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(?:$unit))$/";
$sizeIndex = null;
// Find index of font-size to split the component list
foreach ($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);
$stylePattern = "/^(italic|oblique)$/";
$variantPattern = "/^(small-caps)$/";
$weightPattern = "/^(bold|bolder|lighter|100|200|300|400|500|600|700|800|900)$/";
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 = $val;
if ($alignment === "") {
$alignment = "left";
if ($this->__get("direction") === "rtl") {
$alignment = "right";
}
}
if (!\in_array($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 $val)
{
if ($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 $val)
{
if ($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 $val)
{
if ($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);
return $computed !== null && $computed >= 0 ? $computed : null;
}
/**
* @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 $break)
{
if ($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 $break)
{
if ($break === "left" || $break === "right") {
$break = "always";
}
return $break;
}
/**
* @link https://www.w3.org/TR/CSS21/visudet.html#propdef-width
*/
protected function _compute_width(string $val)
{
if ($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 $val)
{
if ($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 $val)
{
// Legacy support for `none`, not covered by spec
if ($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 $val)
{
// Legacy support for `none`, not covered by spec
if ($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 $val)
{
// Legacy support for `auto`, not covered by spec
if ($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 $val)
{
// Legacy support for `auto`, not covered by spec
if ($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 $val)
{
if ($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 $val)
{
// Legacy support for `none` keyword, not covered by spec
if ($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 $val)
{
// Legacy support for `none` keyword, not covered by spec
if ($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 array 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
{
$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 $val)
{
return \in_array($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)
{
$parts = preg_split("/\s+/", $val);
if (\count($parts) > 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 ($parsed_val === "none") {
return "none";
} else {
return "url($parsed_val)";
}
}
/**
* @link https://www.w3.org/TR/CSS21/generate.html#propdef-list-style
*/
protected function _set_list_style(string $value): array
{
static $positions = ["inside", "outside"];
static $types = [
"disc", "circle", "square",
"decimal-leading-zero", "decimal", "1",
"lower-roman", "upper-roman", "a", "A",
"lower-greek",
"lower-latin", "upper-latin",
"lower-alpha", "upper-alpha",
"armenian", "georgian", "hebrew",
"cjk-ideographic", "hiragana", "katakana",
"hiragana-iroha", "katakana-iroha", "none"
];
$components = $this->parse_property_value($value);
$props = [];
foreach ($components as $val) {
/* https://www.w3.org/TR/CSS21/generate.html#list-style
* A value of 'none' for the 'list-style' property sets both 'list-style-type' and 'list-style-image' to 'none'
*/
if ($val === "none") {
$props["list_style_type"] = $val;
$props["list_style_image"] = $val;
continue;
}
//On setting or merging or inheriting list_style_image as well as list_style_type,
//and url exists, then url has precedence, otherwise fall back to list_style_type
//Firefox is wrong here (list_style_image gets overwritten on explicit list_style_type)
//Internet Explorer 7/8 and dompdf is right.
if (mb_substr($val, 0, 4) === "url(") {
$props["list_style_image"] = $val;
continue;
}
if (\in_array($val, $types, true)) {
$props["list_style_type"] = $val;
} elseif (\in_array($val, $positions, true)) {
$props["list_style_position"] = $val;
}
}
return $props;
}
/**
* @link https://www.w3.org/TR/css-page-3/#page-size-prop
*/
protected function _compute_size(string $val)
{
if ($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];
}
/**
* @param string $computed
* @return array
*
* @link https://www.w3.org/TR/css-transforms-1/#transform-property
*/
protected function _get_transform($computed)
{
//TODO: should be handled in setter (lengths set to absolute)
$number = "\s*([^,\s]+)\s*";
$tr_value = "\s*([^,\s]+)\s*";
$angle = "\s*([^,\s]+(?:deg|rad)?)\s*";
if (!preg_match_all("/[a-z]+\([^\)]+\)/i", $computed, $parts, PREG_SET_ORDER)) {
return [];
}
$functions = [
//"matrix" => "\($number,$number,$number,$number,$number,$number\)",
"translate" => "\($tr_value(?:,$tr_value)?\)",
"translateX" => "\($tr_value\)",
"translateY" => "\($tr_value\)",
"scale" => "\($number(?:,$number)?\)",
"scaleX" => "\($number\)",
"scaleY" => "\($number\)",
"rotate" => "\($angle\)",
"skew" => "\($angle(?:,$angle)?\)",
"skewX" => "\($angle\)",
"skewY" => "\($angle\)",
];
$transforms = [];
foreach ($parts as $part) {
$t = $part[0];
foreach ($functions as $name => $pattern) {
if (preg_match("/$name\s*$pattern/i", $t, $matches)) {
$values = \array_slice($matches, 1);
switch ($name) {
// <angle> units
case "rotate":
case "skew":
case "skewX":
case "skewY":
foreach ($values as $i => $value) {
if (strpos($value, "rad")) {
$values[$i] = rad2deg((float) $value);
} else {
$values[$i] = (float) $value;
}
}
switch ($name) {
case "skew":
if (!isset($values[1])) {
$values[1] = 0;
}
break;
case "skewX":
$name = "skew";
$values = [$values[0], 0];
break;
case "skewY":
$name = "skew";
$values = [0, $values[0]];
break;
}
break;
// <translation-value> units
case "translate":
$values[0] = $this->length_in_pt($values[0], (float)$this->length_in_pt($this->width));
if (isset($values[1])) {
$values[1] = $this->length_in_pt($values[1], (float)$this->length_in_pt($this->height));
} else {
$values[1] = 0;
}
break;
case "translateX":
$name = "translate";
$values = [$this->length_in_pt($values[0], (float)$this->length_in_pt($this->width)), 0];
break;
case "translateY":
$name = "translate";
$values = [0, $this->length_in_pt($values[0], (float)$this->length_in_pt($this->height))];
break;
// <number> units
case "scale":
if (!isset($values[1])) {
$values[1] = $values[0];
}
break;
case "scaleX":
$name = "scale";
$values = [$values[0], 1.0];
break;
case "scaleY":
$name = "scale";
$values = [1.0, $values[0]];
break;
}
$transforms[] = [
$name,
$values,
];
}
}
}
return $transforms;
}
/**
* @param string $computed
* @return array
*
* @link https://www.w3.org/TR/css-transforms-1/#transform-origin-property
*/
protected function _get_transform_origin($computed)
{
//TODO: should be handled in setter
$values = preg_split("/\s+/", $computed);
$values = array_map(function ($value) {
if (\in_array($value, ["top", "left"], true)) {
return 0;
} elseif (\in_array($value, ["bottom", "right"], true)) {
return "100%";
} else {
return $value;
}
}, $values);
if (!isset($values[1])) {
$values[1] = $values[0];
}
return $values;
}
/**
* @param string $val
* @return string|null
*/
protected function parse_image_resolution(string $val): ?string
{
// If exif data could be get:
// $re = '/^\s*(\d+|normal|auto)(?:\s*,\s*(\d+|normal))?\s*$/';
$re = '/^\s*(\d+|normal|auto)\s*$/';
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 $val)
{
if ($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";
}
}
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