source: trip-planner-front/node_modules/svgo/plugins/removeUselessStrokeAndFill.js@ 76712b2

Last change on this file since 76712b2 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1'use strict';
2
3const { visit, visitSkip, detachNodeFromParent } = require('../lib/xast.js');
4const { collectStylesheet, computeStyle } = require('../lib/style.js');
5const { elemsGroups } = require('./_collections.js');
6
7exports.type = 'visitor';
8exports.name = 'removeUselessStrokeAndFill';
9exports.active = true;
10exports.description = 'removes useless stroke and fill attributes';
11
12/**
13 * Remove useless stroke and fill attrs.
14 *
15 * @author Kir Belevich
16 *
17 * @type {import('../lib/types').Plugin<{
18 * stroke?: boolean,
19 * fill?: boolean,
20 * removeNone?: boolean
21 * }>}
22 */
23exports.fn = (root, params) => {
24 const {
25 stroke: removeStroke = true,
26 fill: removeFill = true,
27 removeNone = false,
28 } = params;
29
30 // style and script elements deoptimise this plugin
31 let hasStyleOrScript = false;
32 visit(root, {
33 element: {
34 enter: (node) => {
35 if (node.name === 'style' || node.name === 'script') {
36 hasStyleOrScript = true;
37 }
38 },
39 },
40 });
41 if (hasStyleOrScript) {
42 return null;
43 }
44
45 const stylesheet = collectStylesheet(root);
46
47 return {
48 element: {
49 enter: (node, parentNode) => {
50 // id attribute deoptimise the whole subtree
51 if (node.attributes.id != null) {
52 return visitSkip;
53 }
54 if (elemsGroups.shape.includes(node.name) == false) {
55 return;
56 }
57 const computedStyle = computeStyle(stylesheet, node);
58 const stroke = computedStyle.stroke;
59 const strokeOpacity = computedStyle['stroke-opacity'];
60 const strokeWidth = computedStyle['stroke-width'];
61 const markerEnd = computedStyle['marker-end'];
62 const fill = computedStyle.fill;
63 const fillOpacity = computedStyle['fill-opacity'];
64 const computedParentStyle =
65 parentNode.type === 'element'
66 ? computeStyle(stylesheet, parentNode)
67 : null;
68 const parentStroke =
69 computedParentStyle == null ? null : computedParentStyle.stroke;
70
71 // remove stroke*
72 if (removeStroke) {
73 if (
74 stroke == null ||
75 (stroke.type === 'static' && stroke.value == 'none') ||
76 (strokeOpacity != null &&
77 strokeOpacity.type === 'static' &&
78 strokeOpacity.value === '0') ||
79 (strokeWidth != null &&
80 strokeWidth.type === 'static' &&
81 strokeWidth.value === '0')
82 ) {
83 // stroke-width may affect the size of marker-end
84 // marker is not visible when stroke-width is 0
85 if (
86 (strokeWidth != null &&
87 strokeWidth.type === 'static' &&
88 strokeWidth.value === '0') ||
89 markerEnd == null
90 ) {
91 for (const name of Object.keys(node.attributes)) {
92 if (name.startsWith('stroke')) {
93 delete node.attributes[name];
94 }
95 }
96 // set explicit none to not inherit from parent
97 if (
98 parentStroke != null &&
99 parentStroke.type === 'static' &&
100 parentStroke.value !== 'none'
101 ) {
102 node.attributes.stroke = 'none';
103 }
104 }
105 }
106 }
107
108 // remove fill*
109 if (removeFill) {
110 if (
111 (fill != null && fill.type === 'static' && fill.value === 'none') ||
112 (fillOpacity != null &&
113 fillOpacity.type === 'static' &&
114 fillOpacity.value === '0')
115 ) {
116 for (const name of Object.keys(node.attributes)) {
117 if (name.startsWith('fill-')) {
118 delete node.attributes[name];
119 }
120 }
121 if (
122 fill == null ||
123 (fill.type === 'static' && fill.value !== 'none')
124 ) {
125 node.attributes.fill = 'none';
126 }
127 }
128 }
129
130 if (removeNone) {
131 if (
132 (stroke == null || node.attributes.stroke === 'none') &&
133 ((fill != null &&
134 fill.type === 'static' &&
135 fill.value === 'none') ||
136 node.attributes.fill === 'none')
137 ) {
138 detachNodeFromParent(node, parentNode);
139 }
140 }
141 },
142 },
143 };
144};
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