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62 lines
1.8 KiB
62 lines
1.8 KiB
2 years ago
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'use strict';
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exports.type = 'visitor';
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exports.name = 'removeUnusedNS';
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exports.active = true;
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exports.description = 'removes unused namespaces declaration';
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/**
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* Remove unused namespaces declaration from svg element
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* which are not used in elements or attributes
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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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/**
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* @type {Set<string>}
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*/
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const unusedNamespaces = new Set();
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return {
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element: {
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enter: (node, parentNode) => {
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// collect all namespaces from svg element
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// (such as xmlns:xlink="http://www.w3.org/1999/xlink")
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if (node.name === 'svg' && parentNode.type === 'root') {
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for (const name of Object.keys(node.attributes)) {
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if (name.startsWith('xmlns:')) {
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const local = name.slice('xmlns:'.length);
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unusedNamespaces.add(local);
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}
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}
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}
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if (unusedNamespaces.size !== 0) {
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// preserve namespace used in nested elements names
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if (node.name.includes(':')) {
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const [ns] = node.name.split(':');
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if (unusedNamespaces.has(ns)) {
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unusedNamespaces.delete(ns);
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}
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}
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// preserve namespace used in nested elements attributes
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for (const name of Object.keys(node.attributes)) {
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if (name.includes(':')) {
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const [ns] = name.split(':');
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unusedNamespaces.delete(ns);
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}
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}
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}
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},
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exit: (node, parentNode) => {
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// remove unused namespace attributes from svg element
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if (node.name === 'svg' && parentNode.type === 'root') {
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for (const name of unusedNamespaces) {
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delete node.attributes[`xmlns:${name}`];
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}
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}
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},
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},
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};
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};
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