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114 lines
3.3 KiB
114 lines
3.3 KiB
3 years ago
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'use strict';
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/**
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* @typedef {import('../lib/types').XastElement} XastElement
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* @typedef {import('../lib/types').XastParent} XastParent
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* @typedef {import('../lib/types').XastNode} XastNode
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*/
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const JSAPI = require('../lib/svgo/jsAPI.js');
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exports.type = 'visitor';
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exports.name = 'reusePaths';
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exports.active = false;
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exports.description =
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'Finds <path> elements with the same d, fill, and ' +
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'stroke, and converts them to <use> elements ' +
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'referencing a single <path> def.';
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/**
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* Finds <path> elements with the same d, fill, and stroke, and converts them to
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* <use> elements referencing a single <path> def.
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*
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* @author Jacob Howcroft
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*
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* @type {import('../lib/types').Plugin<void>}
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*/
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exports.fn = () => {
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/**
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* @type {Map<string, Array<XastElement>>}
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*/
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const paths = new Map();
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return {
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element: {
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enter: (node) => {
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if (node.name === 'path' && node.attributes.d != null) {
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const d = node.attributes.d;
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const fill = node.attributes.fill || '';
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const stroke = node.attributes.stroke || '';
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const key = d + ';s:' + stroke + ';f:' + fill;
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let list = paths.get(key);
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if (list == null) {
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list = [];
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paths.set(key, list);
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}
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list.push(node);
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}
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},
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exit: (node, parentNode) => {
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if (node.name === 'svg' && parentNode.type === 'root') {
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/**
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* @type {XastElement}
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*/
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const rawDefs = {
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type: 'element',
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name: 'defs',
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attributes: {},
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children: [],
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};
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/**
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* @type {XastElement}
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*/
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const defsTag = new JSAPI(rawDefs, node);
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let index = 0;
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for (const list of paths.values()) {
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if (list.length > 1) {
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// add reusable path to defs
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/**
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* @type {XastElement}
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*/
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const rawPath = {
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type: 'element',
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name: 'path',
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attributes: { ...list[0].attributes },
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children: [],
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};
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delete rawPath.attributes.transform;
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let id;
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if (rawPath.attributes.id == null) {
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id = 'reuse-' + index;
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index += 1;
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rawPath.attributes.id = id;
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} else {
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id = rawPath.attributes.id;
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delete list[0].attributes.id;
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}
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/**
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* @type {XastElement}
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*/
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const reusablePath = new JSAPI(rawPath, defsTag);
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defsTag.children.push(reusablePath);
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// convert paths to <use>
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for (const pathNode of list) {
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pathNode.name = 'use';
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pathNode.attributes['xlink:href'] = '#' + id;
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delete pathNode.attributes.d;
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delete pathNode.attributes.stroke;
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delete pathNode.attributes.fill;
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}
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}
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}
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if (defsTag.children.length !== 0) {
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if (node.attributes['xmlns:xlink'] == null) {
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node.attributes['xmlns:xlink'] = 'http://www.w3.org/1999/xlink';
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}
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node.children.unshift(defsTag);
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}
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}
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},
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},
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};
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};
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