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58 lines
1.5 KiB
58 lines
1.5 KiB
'use strict';
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const { detachNodeFromParent } = require('../lib/xast.js');
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const { elemsGroups } = require('./_collections.js');
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exports.type = 'visitor';
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exports.name = 'removeEmptyContainers';
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exports.active = true;
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exports.description = 'removes empty container elements';
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/**
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* Remove empty containers.
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*
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* @see https://www.w3.org/TR/SVG11/intro.html#TermContainerElement
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*
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* @example
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* <defs/>
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*
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* @example
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* <g><marker><a/></marker></g>
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*
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* @author Kir Belevich
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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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return {
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element: {
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exit: (node, parentNode) => {
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// remove only empty non-svg containers
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if (
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node.name === 'svg' ||
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elemsGroups.container.includes(node.name) === false ||
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node.children.length !== 0
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) {
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return;
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}
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// empty patterns may contain reusable configuration
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if (
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node.name === 'pattern' &&
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Object.keys(node.attributes).length !== 0
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) {
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return;
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}
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// The <g> may not have content, but the filter may cause a rectangle
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// to be created and filled with pattern.
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if (node.name === 'g' && node.attributes.filter != null) {
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return;
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}
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// empty <mask> hides masked element
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if (node.name === 'mask' && node.attributes.id != null) {
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return;
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}
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detachNodeFromParent(node, parentNode);
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},
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},
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};
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};
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