source: trip-planner-front/node_modules/svgo/plugins/reusePaths.js@ 188ee53

Last change on this file since 188ee53 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1'use strict';
2
3/**
4 * @typedef {import('../lib/types').XastElement} XastElement
5 * @typedef {import('../lib/types').XastParent} XastParent
6 * @typedef {import('../lib/types').XastNode} XastNode
7 */
8
9const JSAPI = require('../lib/svgo/jsAPI.js');
10
11exports.type = 'visitor';
12exports.name = 'reusePaths';
13exports.active = false;
14exports.description =
15 'Finds <path> elements with the same d, fill, and ' +
16 'stroke, and converts them to <use> elements ' +
17 'referencing a single <path> def.';
18
19/**
20 * Finds <path> elements with the same d, fill, and stroke, and converts them to
21 * <use> elements referencing a single <path> def.
22 *
23 * @author Jacob Howcroft
24 *
25 * @type {import('../lib/types').Plugin<void>}
26 */
27exports.fn = () => {
28 /**
29 * @type {Map<string, Array<XastElement>>}
30 */
31 const paths = new Map();
32
33 return {
34 element: {
35 enter: (node) => {
36 if (node.name === 'path' && node.attributes.d != null) {
37 const d = node.attributes.d;
38 const fill = node.attributes.fill || '';
39 const stroke = node.attributes.stroke || '';
40 const key = d + ';s:' + stroke + ';f:' + fill;
41 let list = paths.get(key);
42 if (list == null) {
43 list = [];
44 paths.set(key, list);
45 }
46 list.push(node);
47 }
48 },
49
50 exit: (node, parentNode) => {
51 if (node.name === 'svg' && parentNode.type === 'root') {
52 /**
53 * @type {XastElement}
54 */
55 const rawDefs = {
56 type: 'element',
57 name: 'defs',
58 attributes: {},
59 children: [],
60 };
61 /**
62 * @type {XastElement}
63 */
64 const defsTag = new JSAPI(rawDefs, node);
65 let index = 0;
66 for (const list of paths.values()) {
67 if (list.length > 1) {
68 // add reusable path to defs
69 /**
70 * @type {XastElement}
71 */
72 const rawPath = {
73 type: 'element',
74 name: 'path',
75 attributes: { ...list[0].attributes },
76 children: [],
77 };
78 delete rawPath.attributes.transform;
79 let id;
80 if (rawPath.attributes.id == null) {
81 id = 'reuse-' + index;
82 index += 1;
83 rawPath.attributes.id = id;
84 } else {
85 id = rawPath.attributes.id;
86 delete list[0].attributes.id;
87 }
88 /**
89 * @type {XastElement}
90 */
91 const reusablePath = new JSAPI(rawPath, defsTag);
92 defsTag.children.push(reusablePath);
93 // convert paths to <use>
94 for (const pathNode of list) {
95 pathNode.name = 'use';
96 pathNode.attributes['xlink:href'] = '#' + id;
97 delete pathNode.attributes.d;
98 delete pathNode.attributes.stroke;
99 delete pathNode.attributes.fill;
100 }
101 }
102 }
103 if (defsTag.children.length !== 0) {
104 if (node.attributes['xmlns:xlink'] == null) {
105 node.attributes['xmlns:xlink'] = 'http://www.w3.org/1999/xlink';
106 }
107 node.children.unshift(defsTag);
108 }
109 }
110 },
111 },
112 };
113};
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