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properties.c
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/*
* lib/css/src/properties.c
*
* Copyright (c) 2023-2025, Liu Chao <i@lc-soft.io> All rights reserved.
*
* SPDX-License-Identifier: MIT
*
* This file is part of LCUI, distributed under the MIT License found in the
* LICENSE.TXT file in the root directory of this source tree.
*/
#include <errno.h>
#include <css/properties.h>
#include <css/value.h>
#include <css/style_value.h>
#include <css/computed.h>
#define DEFINE_PROP(PROP_KEY, PROP_NAME, VALDEF, INIT) \
extern int css_cascade_##PROP_KEY(const css_style_array_value_t, \
css_computed_style_t *); \
css_register_property_with_key(css_prop_##PROP_KEY, PROP_NAME, VALDEF, \
INIT, css_cascade_##PROP_KEY)
#define DEFINE_SHORTHAND_PROP(PROP_KEY, NAME, VALDEF) \
extern int css_parse_##PROP_KEY(css_propdef_t *, const char *, \
css_style_decl_t *); \
css_register_shorthand_property(NAME, VALDEF, css_parse_##PROP_KEY)
static struct css_properties_module {
/**
* 样式属性列表
* css_propdef_t*[]
*/
css_propdef_t **list;
unsigned list_length;
/**
* 简写样式属性列表
* css_propdef_t*[]
*/
css_propdef_t **shorthand_list;
unsigned shorthand_list_length;
/**
* 样式属性表，以名称索引
* dict_t<string, css_propdef_t>
*/
dict_t *map;
} css_properties;
static void css_propdef_destroy(css_propdef_t *prop)
{
if (prop->name) {
free(prop->name);
}
css_valdef_destroy(prop->valdef);
css_style_value_destroy(&prop->initial_value);
prop->name = NULL;
prop->valdef = NULL;
free(prop);
}
int css_register_shorthand_property(const char *name, const char *syntax,
int (*parse)(css_propdef_t *, const char *,
css_style_decl_t *))
{
css_propdef_t *prop;
css_propdef_t **props;
prop = calloc(1, sizeof(css_propdef_t));
if (!prop) {
return -ENOMEM;
}
prop->valdef = css_compile_valdef(syntax);
if (!prop->valdef) {
logger_error("[css] [shorthand proeprty: %s] invalid value "
"definition: %s\n",
name, syntax);
free(prop);
return -1;
}
props = realloc(css_properties.shorthand_list,
(css_properties.shorthand_list_length + 1) *
sizeof(css_propdef_t *));
if (!props) {
free(prop);
return -ENOMEM;
}
prop->key = -1;
prop->parse = parse;
prop->name = strdup2(name);
props[css_properties.shorthand_list_length] = prop;
css_properties.shorthand_list_length++;
css_properties.shorthand_list = props;
dict_add(css_properties.map, prop->name, prop);
return 0;
}
static int css_register_property_with_key(
unsigned key, const char *name, const char *syntax,
const char *initial_value,
int (*cascade)(const css_style_array_value_t, css_computed_style_t *))
{
unsigned i;
css_propdef_t *prop;
css_propdef_t **props;
prop = calloc(1, sizeof(css_propdef_t));
if (!prop) {
return -ENOMEM;
}
prop->valdef = css_compile_valdef(syntax);
if (!prop->valdef) {
logger_error(
"[css] [proeprty: %s] invalid value definition: %s\n", name,
syntax);
free(prop);
return -1;
}
if (css_parse_value(prop->valdef, initial_value, &prop->initial_value) <
0) {
logger_error("[css] [property: %s] invalid initial value: %s\n",
name, initial_value);
css_valdef_destroy(prop->valdef);
free(prop);
return -1;
}
prop->name = strdup2(name);
prop->key = key;
prop->cascade = cascade;
if (key >= css_properties.list_length) {
props = realloc(css_properties.list,
(key + 1) * sizeof(css_propdef_t *));
if (!props) {
css_propdef_destroy(prop);
return -ENOMEM;
}
for (i = css_properties.list_length; i <= key; ++i) {
props[i] = NULL;
}
css_properties.list = props;
css_properties.list_length = key + 1;
}
css_properties.list[prop->key] = prop;
dict_add(css_properties.map, prop->name, prop);
return prop->key;
}
int css_register_property(const char *name, const char *definition,
const char *initial_value,
int (*cascade)(const css_style_array_value_t,
css_computed_style_t *))
{
return css_register_property_with_key((int)css_properties.list_length,
name, definition, initial_value,
cascade);
}
css_propdef_t *css_get_propdef_by_name(const char *name)
{
return dict_fetch_value(css_properties.map, name);
}
css_propdef_t *css_get_propdef(int key)
{
if (key >= 0 && (size_t)key < css_properties.list_length) {
return css_properties.list[key];
}
return NULL;
}
unsigned css_get_prop_count(void)
{
return css_properties.list_length;
}
void css_init_properties(void)
{
static dict_type_t dt = { 0 };
dict_init_string_key_type(&dt);
css_properties.map = dict_create(&dt, NULL);
css_properties.list = NULL;
css_properties.list_length = 0;
css_properties.shorthand_list = NULL;
css_properties.shorthand_list_length = 0;
css_register_valdef_alias("line-width", "<length>");
css_register_valdef_alias("line-style", "none | solid");
css_register_valdef_alias("length-percentage",
"<length> | <percentage>");
css_register_valdef_alias("shadow", "<length>{2,4} && <color>?");
css_register_valdef_alias(
"content-position", "center | start | end | flex-start | flex-end");
css_register_valdef_alias(
"content-distribution",
"space-between | space-around | space-evenly | stretch");
css_register_valdef_alias("image", "<url>");
css_register_valdef_alias("bg-image", "none | <image>");
css_register_valdef_alias(
"bg-position",
"["
" [ left | center | right | top | bottom | <length-percentage> ] |"
" [ left | center | right | <length-percentage> ]"
" [ top | center | bottom | <length-percentage> ] |"
" [ center | [ left | right ] <length-percentage>? ] &&"
" [ center | [ top | bottom ] <length-percentage>? ]"
"]");
css_register_valdef_alias(
"bg-size",
"[ <length> | <percentage> | auto ]{1,2} | cover | contain");
css_register_valdef_alias("repeat-style",
"repeat-x | repeat-x | repeat | no-repeat");
css_register_valdef_alias("flex-grow", "<number>");
css_register_valdef_alias("flex-shrink", "<number>");
css_register_valdef_alias("flex-basis",
"auto | content | <length-percentage>");
css_register_valdef_alias("margin-top", "auto | <length-percentage>");
css_register_valdef_alias("padding-top", "auto | <length-percentage>");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/visibility */
DEFINE_PROP(visibility, "visibility", "visible | hidden", "visible");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/width */
DEFINE_PROP(width, "width",
"auto | fit-content | <length> | <percentage>", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/height */
DEFINE_PROP(height, "height", "auto | <length> | <percentage>", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/min-width */
DEFINE_PROP(min_width, "min-width",
"auto | min-content | <length> | <percentage>", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/min-height */
DEFINE_PROP(min_height, "min-height", "auto | min-content | <length> | <percentage>",
"auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/max-width */
DEFINE_PROP(max_width, "max-width", "auto | <length> | <percentage>",
"auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/max-height */
DEFINE_PROP(max_height, "max-height", "auto | <length> | <percentage>",
"auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/display */
DEFINE_PROP(display, "display",
"none | block | inline-block | flex | inline-flex",
"block");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/z-index */
DEFINE_PROP(z_index, "z-index", "auto | <integer>", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/top */
DEFINE_PROP(top, "top", "<length> | <percentage> | auto", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSSright */
DEFINE_PROP(right, "right", "<length> | <percentage> | auto", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/left */
DEFINE_PROP(left, "left", "<length> | <percentage> | auto", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/bottom */
DEFINE_PROP(bottom, "bottom", "<length> | <percentage> | auto", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/position */
DEFINE_PROP(position, "position", "static | relative | absolute",
"static");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/opacity */
DEFINE_PROP(opacity, "opacity", "<number> | <percentage>", "1");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/vertical-align
*/
DEFINE_PROP(vertical_align, "vertical-align", "middle | bottom | top",
"top");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background */
DEFINE_SHORTHAND_PROP(
background, "background",
"<bg-image> || <bg-position> || <bg-size> || <repeat-style> || "
"<color>");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-color */
DEFINE_PROP(background_color, "background-color", "<color>",
"transparent");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-clip */
DEFINE_PROP(background_clip, "background-clip",
"border-box | padding-box | content-box", "border-box");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-position
*/
DEFINE_SHORTHAND_PROP(background_position, "background-position",
"<bg-position>");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-position-x
*/
DEFINE_PROP(background_position_x, "background-position-x",
"center | left | right | <length-percentage>", "0%");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-position-y
*/
DEFINE_PROP(background_position_y, "background-position-y",
"center | top | bottom | <length-percentage>", "0%");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-repeat
*/
DEFINE_PROP(background_repeat, "background-repeat", "<repeat-style>",
"repeat");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-size */
DEFINE_PROP(background_size, "background-size", "<bg-size>",
"auto auto");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/background-image */
DEFINE_PROP(background_image, "background-image", "none | <image>",
"none");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/padding-left
*/
DEFINE_PROP(padding_left, "padding-left", "<padding-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/padding-right
*/
DEFINE_PROP(padding_right, "padding-right", "<padding-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/padding-top */
DEFINE_PROP(padding_top, "padding-top", "<padding-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/padding-bottom
*/
DEFINE_PROP(padding_bottom, "padding-bottom", "<padding-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/padding
*/
DEFINE_SHORTHAND_PROP(padding, "padding", "<padding-top>{1,4}");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/margin-left */
DEFINE_PROP(margin_left, "margin-left", "<margin-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/margin-right
*/
DEFINE_PROP(margin_right, "margin-right", "<margin-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/margin-top */
DEFINE_PROP(margin_top, "margin-top", "<margin-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/margin-bottom
*/
DEFINE_PROP(margin_bottom, "margin-bottom", "<margin-top>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/margin
*/
DEFINE_SHORTHAND_PROP(margin, "margin", "<margin-top>{1,4}");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-top-color */
DEFINE_PROP(border_top_color, "border-top-color", "<color>",
"transparent");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-right-color
*/
DEFINE_PROP(border_right_color, "border-right-color", "<color>",
"transparent");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom-color
*/
DEFINE_PROP(border_bottom_color, "border-bottom-color", "<color>",
"transparent");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-left-color */
DEFINE_PROP(border_left_color, "border-left-color", "<color>",
"transparent");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-color */
DEFINE_SHORTHAND_PROP(border_color, "border-color", "<color>");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-top-width */
DEFINE_PROP(border_top_width, "border-top-width", "<line-width>", "0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-right-width
*/
DEFINE_PROP(border_right_width, "border-right-width", "<line-width>",
"0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom-width
*/
DEFINE_PROP(border_bottom_width, "border-bottom-width", "<line-width>",
"0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-left-width */
DEFINE_PROP(border_left_width, "border-left-width", "<line-width>",
"0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-width */
DEFINE_SHORTHAND_PROP(border_width, "border-width",
"<line-width>{1,4}");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-top-style */
DEFINE_PROP(border_top_style, "border-top-style", "<line-style>",
"none");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-right-style
*/
DEFINE_PROP(border_right_style, "border-right-style", "<line-style>",
"none");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom-style
*/
DEFINE_PROP(border_bottom_style, "border-bottom-style", "<line-style>",
"none");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-left-style */
DEFINE_PROP(border_left_style, "border-left-style", "<line-style>",
"none");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-style */
DEFINE_SHORTHAND_PROP(border_style, "border-style",
"<line-style>{1,4}");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-top-left-radius
*/
DEFINE_PROP(border_top_left_radius, "border-top-left-radius",
"<length>", "0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-top-right-radius
*/
DEFINE_PROP(border_top_right_radius, "border-top-right-radius",
"<length>", "0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom-left-radius
*/
DEFINE_PROP(border_bottom_left_radius, "border-bottom-left-radius",
"<length>", "0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom-right-radius
*/
DEFINE_PROP(border_bottom_right_radius, "border-bottom-right-radius",
"<length>", "0");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius
*/
DEFINE_SHORTHAND_PROP(border_radius, "border-radius", "<length>{1,4}");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-top */
DEFINE_SHORTHAND_PROP(border_top, "border-top",
"<line-width> || <line-style> || <color>");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-right */
DEFINE_SHORTHAND_PROP(border_right, "border-right",
"<line-width> || <line-style> || <color>");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom */
DEFINE_SHORTHAND_PROP(border_bottom, "border-bottom",
"<line-width> || <line-style> || <color>");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border-left */
DEFINE_SHORTHAND_PROP(border_left, "border-left",
"<line-width> || <line-style> || <color>");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/border
*/
DEFINE_SHORTHAND_PROP(border, "border",
"<line-width> || <line-style> || <color>");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow */
DEFINE_PROP(box_shadow, "box-shadow", "none | <shadow>", "none");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/pointer-events
*/
DEFINE_PROP(pointer_events, "pointer-events", "auto | none", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/box-sizing */
DEFINE_PROP(box_sizing, "box-sizing", "content-box | border-box",
"content-box");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/flex */
DEFINE_SHORTHAND_PROP(flex, "flex",
"initial | none | [ <flex-grow> || <flex-shrink> "
"|| <flex-basis> ]");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/flex-basis */
DEFINE_PROP(flex_basis, "flex-basis", "auto | <length>", "auto");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/flex-direction
*/
DEFINE_PROP(flex_direction, "flex-direction", "row | column", "row");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/flex-grow */
DEFINE_PROP(flex_grow, "flex-grow", "<flex-grow>", "0");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/flex-shrink */
DEFINE_PROP(flex_shrink, "flex-shrink", "<flex-shrink>", "1");
/** @see https://developer.mozilla.org/en-US/do/cs/Web/CSS/flex-wrap */
DEFINE_PROP(flex_wrap, "flex-wrap", "nowrap | wrap", "nowrap");
/** @see
* https://developer.mozilla.org/en-US/docs/Web/CSS/justify-content */
DEFINE_PROP(justify_content, "justify-content",
"normal | <content-distribution> | <content-position>",
"normal");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/align-content
*/
DEFINE_PROP(align_content, "align-content",
"normal | <content-distribution> | <content-position>",
"normal");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/align-items */
DEFINE_PROP(align_items, "align-items",
"normal | stretch | flex-start | flex-end | center",
"normal");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/color */
DEFINE_PROP(color, "color", "<color>", "#000");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/font-family */
DEFINE_PROP(font_family, "font-family", "<font-family>", "system-ui");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/font-size */
DEFINE_PROP(font_size, "font-size",
"small | medium | large | <length> | <percentage>",
"medium");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/font-style */
DEFINE_PROP(font_style, "font-style", "normal | italic | oblique",
"normal");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight */
DEFINE_PROP(font_weight, "font-weight", "normal | bold | <number>",
"normal");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/text-align */
DEFINE_PROP(text_align, "text-align", "left | center | right", "left");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/line-height */
DEFINE_PROP(line_height, "line-height",
"normal | <number> | <length-percentage>", "normal");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/content */
DEFINE_PROP(content, "content", "<string> | none", "none");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/white-space */
DEFINE_PROP(white_space, "white-space", "normal | nowrap", "normal");
/** @see https://developer.mozilla.org/en-US/docs/Web/CSS/word-break */
DEFINE_PROP(word_break, "word-break", "normal | break-all", "normal");
}
void css_destroy_properties(void)
{
unsigned i;
dict_destroy(css_properties.map);
for (i = 0; i < css_properties.list_length; ++i) {
if (css_properties.list[i]) {
css_propdef_destroy(css_properties.list[i]);
css_properties.list[i] = NULL;
}
}
for (i = 0; i < css_properties.shorthand_list_length; ++i) {
if (css_properties.shorthand_list[i]) {
css_propdef_destroy(css_properties.shorthand_list[i]);
css_properties.shorthand_list[i] = NULL;
}
}
free(css_properties.list);
free(css_properties.shorthand_list);
css_properties.map = NULL;
css_properties.list = NULL;
css_properties.list_length = 0;
css_properties.shorthand_list = NULL;
css_properties.shorthand_list_length = 0;
}