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on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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1 | 'use strict';
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2 |
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3 | const { detachNodeFromParent } = require('../lib/xast.js');
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4 | const { elemsGroups } = require('./_collections.js');
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5 |
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6 | exports.type = 'visitor';
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7 | exports.name = 'removeEmptyContainers';
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8 | exports.active = true;
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9 | exports.description = 'removes empty container elements';
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10 |
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11 | /**
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12 | * Remove empty containers.
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13 | *
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14 | * @see https://www.w3.org/TR/SVG11/intro.html#TermContainerElement
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15 | *
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16 | * @example
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17 | * <defs/>
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18 | *
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19 | * @example
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20 | * <g><marker><a/></marker></g>
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21 | *
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22 | * @author Kir Belevich
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23 | *
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24 | * @type {import('../lib/types').Plugin<void>}
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25 | */
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26 | exports.fn = () => {
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27 | return {
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28 | element: {
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29 | exit: (node, parentNode) => {
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30 | // remove only empty non-svg containers
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31 | if (
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32 | node.name === 'svg' ||
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33 | elemsGroups.container.includes(node.name) === false ||
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34 | node.children.length !== 0
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35 | ) {
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36 | return;
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37 | }
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38 | // empty patterns may contain reusable configuration
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39 | if (
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40 | node.name === 'pattern' &&
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41 | Object.keys(node.attributes).length !== 0
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42 | ) {
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43 | return;
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44 | }
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45 | // The <g> may not have content, but the filter may cause a rectangle
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46 | // to be created and filled with pattern.
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47 | if (node.name === 'g' && node.attributes.filter != null) {
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48 | return;
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49 | }
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50 | // empty <mask> hides masked element
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51 | if (node.name === 'mask' && node.attributes.id != null) {
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52 | return;
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53 | }
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54 | detachNodeFromParent(node, parentNode);
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55 | },
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56 | },
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57 | };
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58 | };
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