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176 lines (158 loc) · 5.47 KB
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import { collectStylesheet } from '../lib/style.js';
import { detachNodeFromParent, querySelectorAll } from '../lib/xast.js';
export const name = 'reusePaths';
export const description =
'Finds <path> elements with the same d, fill, and ' +
'stroke, and converts them to <use> elements ' +
'referencing a single <path> def.';
/**
* Finds <path> elements with the same d, fill, and stroke, and converts them to
* <use> elements referencing a single <path> def.
*
* @author Jacob Howcroft
*
* @type {import('../lib/types.js').Plugin}
* @since 1.2.0
*/
export const fn = (root) => {
const stylesheet = collectStylesheet(root);
/** @type {Map<string, import('../lib/types.js').XastElement[]>} */
const paths = new Map();
/**
* Reference to the first defs element that is a direct child of the svg
* element if one exists.
*
* @type {import('../lib/types.js').XastElement}
* @see https://developer.mozilla.org/en-US/docs/Web/SVG/Element/defs
*/
let svgDefs;
/**
* Set of hrefs that reference the id of another node.
*
* @type {Set<string>}
*/
const hrefs = new Set();
return {
element: {
enter: (node, parentNode) => {
if (node.name === 'path' && node.attributes.d != null) {
const d = node.attributes.d;
const fill = node.attributes.fill || '';
const stroke = node.attributes.stroke || '';
const key = d + ';s:' + stroke + ';f:' + fill;
let list = paths.get(key);
if (list == null) {
list = [];
paths.set(key, list);
}
list.push(node);
}
if (
svgDefs == null &&
node.name === 'defs' &&
parentNode.type === 'element' &&
parentNode.name === 'svg'
) {
svgDefs = node;
}
if (node.name === 'use') {
for (const name of ['href', 'xlink:href']) {
const href = node.attributes[name];
if (href != null && href.startsWith('#') && href.length > 1) {
hrefs.add(href.slice(1));
}
}
}
},
exit: (node, parentNode) => {
if (node.name === 'svg' && parentNode.type === 'root') {
let defsTag = svgDefs;
if (defsTag == null) {
defsTag = {
type: 'element',
name: 'defs',
attributes: {},
children: [],
};
}
let index = 0;
for (const list of paths.values()) {
if (list.length > 1) {
/** @type {import('../lib/types.js').XastElement} */
const reusablePath = {
type: 'element',
name: 'path',
attributes: {},
children: [],
};
for (const attr of ['fill', 'stroke', 'd']) {
if (list[0].attributes[attr] != null) {
reusablePath.attributes[attr] = list[0].attributes[attr];
}
}
const originalId = list[0].attributes.id;
if (
originalId == null ||
hrefs.has(originalId) ||
stylesheet.rules.some(
(rule) => rule.selector === `#${originalId}`,
)
) {
reusablePath.attributes.id = 'reuse-' + index++;
} else {
reusablePath.attributes.id = originalId;
delete list[0].attributes.id;
}
defsTag.children.push(reusablePath);
// convert paths to <use>
for (const pathNode of list) {
delete pathNode.attributes.d;
delete pathNode.attributes.stroke;
delete pathNode.attributes.fill;
if (
defsTag.children.includes(pathNode) &&
pathNode.children.length === 0
) {
if (Object.keys(pathNode.attributes).length === 0) {
detachNodeFromParent(pathNode, defsTag);
continue;
}
if (
Object.keys(pathNode.attributes).length === 1 &&
pathNode.attributes.id != null
) {
detachNodeFromParent(pathNode, defsTag);
const selector = `[xlink\\:href=#${pathNode.attributes.id}], [href=#${pathNode.attributes.id}]`;
for (const child of querySelectorAll(node, selector)) {
if (child.type !== 'element') {
continue;
}
for (const name of ['href', 'xlink:href']) {
if (child.attributes[name] != null) {
child.attributes[name] =
'#' + reusablePath.attributes.id;
}
}
}
continue;
}
}
pathNode.name = 'use';
pathNode.attributes['xlink:href'] =
'#' + reusablePath.attributes.id;
}
}
}
if (defsTag.children.length !== 0) {
if (node.attributes['xmlns:xlink'] == null) {
node.attributes['xmlns:xlink'] = 'http://www.w3.org/1999/xlink';
}
if (svgDefs == null) {
node.children.unshift(defsTag);
}
}
}
},
},
};
};