source: trip-planner-front/node_modules/svgo/plugins/mergeStyles.js@ 6a80231

Last change on this file since 6a80231 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.3 KB
Line 
1'use strict';
2
3/**
4 * @typedef {import('../lib/types').XastElement} XastElement
5 */
6
7const { visitSkip, detachNodeFromParent } = require('../lib/xast.js');
8const JSAPI = require('../lib/svgo/jsAPI.js');
9
10exports.name = 'mergeStyles';
11exports.type = 'visitor';
12exports.active = true;
13exports.description = 'merge multiple style elements into one';
14
15/**
16 * Merge multiple style elements into one.
17 *
18 * @author strarsis <strarsis@gmail.com>
19 *
20 * @type {import('../lib/types').Plugin<void>}
21 */
22exports.fn = () => {
23 /**
24 * @type {null | XastElement}
25 */
26 let firstStyleElement = null;
27 let collectedStyles = '';
28 let styleContentType = 'text';
29
30 return {
31 element: {
32 enter: (node, parentNode) => {
33 // skip <foreignObject> content
34 if (node.name === 'foreignObject') {
35 return visitSkip;
36 }
37
38 // collect style elements
39 if (node.name !== 'style') {
40 return;
41 }
42
43 // skip <style> with invalid type attribute
44 if (
45 node.attributes.type != null &&
46 node.attributes.type !== '' &&
47 node.attributes.type !== 'text/css'
48 ) {
49 return;
50 }
51
52 // extract style element content
53 let css = '';
54 for (const child of node.children) {
55 if (child.type === 'text') {
56 css += child.value;
57 }
58 if (child.type === 'cdata') {
59 styleContentType = 'cdata';
60 css += child.value;
61 }
62 }
63
64 // remove empty style elements
65 if (css.trim().length === 0) {
66 detachNodeFromParent(node, parentNode);
67 return;
68 }
69
70 // collect css and wrap with media query if present in attribute
71 if (node.attributes.media == null) {
72 collectedStyles += css;
73 } else {
74 collectedStyles += `@media ${node.attributes.media}{${css}}`;
75 delete node.attributes.media;
76 }
77
78 // combine collected styles in the first style element
79 if (firstStyleElement == null) {
80 firstStyleElement = node;
81 } else {
82 detachNodeFromParent(node, parentNode);
83 firstStyleElement.children = [
84 new JSAPI(
85 { type: styleContentType, value: collectedStyles },
86 firstStyleElement
87 ),
88 ];
89 }
90 },
91 },
92 };
93};
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