/
Style.php
3747 lines (3283 loc) · 112 KB
/
Style.php
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<?php
/**
* @package dompdf
* @link http://dompdf.github.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @author Helmut Tischer <htischer@weihenstephan.org>
* @author Fabien Ménager <fabien.menager@gmail.com>
* @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
* @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
* @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