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svgo/plugins/removeDeprecatedAttrs.js
2025-05-04 17:39:44 +01:00

121 lines
2.9 KiB
JavaScript

import * as csswhat from 'css-what';
import { attrsGroupsDeprecated, elems } from './_collections.js';
import { collectStylesheet } from '../lib/style.js';
/**
* @typedef RemoveDeprecatedAttrsParams
* @property {boolean=} removeUnsafe
*/
export const name = 'removeDeprecatedAttrs';
export const description = 'removes deprecated attributes';
/**
* @param {import('../lib/types.js').Stylesheet} stylesheet
* @returns {Set<string>}
*/
function extractAttributesInStylesheet(stylesheet) {
const attributesInStylesheet = new Set();
stylesheet.rules.forEach((rule) => {
const selectors = csswhat.parse(rule.selector);
selectors.forEach((subselector) => {
subselector.forEach((segment) => {
if (segment.type !== 'attribute') {
return;
}
attributesInStylesheet.add(segment.name);
});
});
});
return attributesInStylesheet;
}
/**
* @param {import('../lib/types.js').XastElement} node
* @param {{ safe?: Set<string>; unsafe?: Set<string> }|undefined} deprecatedAttrs
* @param {import('../lib/types.js').DefaultPlugins['removeDeprecatedAttrs']} params
* @param {Set<string>} attributesInStylesheet
*/
function processAttributes(
node,
deprecatedAttrs,
params,
attributesInStylesheet,
) {
if (!deprecatedAttrs) {
return;
}
if (deprecatedAttrs.safe) {
deprecatedAttrs.safe.forEach((name) => {
if (attributesInStylesheet.has(name)) {
return;
}
delete node.attributes[name];
});
}
if (params.removeUnsafe && deprecatedAttrs.unsafe) {
deprecatedAttrs.unsafe.forEach((name) => {
if (attributesInStylesheet.has(name)) {
return;
}
delete node.attributes[name];
});
}
}
/**
* Remove deprecated attributes.
*
* @type {import('../lib/types.js').Plugin<RemoveDeprecatedAttrsParams>}
*/
export function fn(root, params) {
const stylesheet = collectStylesheet(root);
const attributesInStylesheet = extractAttributesInStylesheet(stylesheet);
return {
element: {
enter: (node) => {
const elemConfig = elems[node.name];
if (!elemConfig) {
return;
}
// Special cases
// Removing deprecated xml:lang is safe when the lang attribute exists.
if (
elemConfig.attrsGroups.has('core') &&
node.attributes['xml:lang'] &&
!attributesInStylesheet.has('xml:lang') &&
node.attributes['lang']
) {
delete node.attributes['xml:lang'];
}
// General cases
elemConfig.attrsGroups.forEach((attrsGroup) => {
processAttributes(
node,
attrsGroupsDeprecated[attrsGroup],
params,
attributesInStylesheet,
);
});
processAttributes(
node,
elemConfig.deprecated,
params,
attributesInStylesheet,
);
},
},
};
}