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114 lines
2.7 KiB
114 lines
2.7 KiB
3 years ago
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'use strict';
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exports.type = 'visitor';
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exports.name = 'sortAttrs';
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exports.active = false;
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exports.description = 'Sort element attributes for better compression';
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/**
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* Sort element attributes for better compression
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*
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* @author Nikolay Frantsev
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*
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* @type {import('../lib/types').Plugin<{
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* order?: Array<string>
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* xmlnsOrder?: 'front' | 'alphabetical'
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* }>}
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*/
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exports.fn = (_root, params) => {
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const {
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order = [
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'id',
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'width',
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'height',
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'x',
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'x1',
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'x2',
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'y',
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'y1',
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'y2',
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'cx',
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'cy',
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'r',
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'fill',
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'stroke',
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'marker',
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'd',
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'points',
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],
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xmlnsOrder = 'front',
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} = params;
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/**
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* @type {(name: string) => number}
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*/
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const getNsPriority = (name) => {
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if (xmlnsOrder === 'front') {
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// put xmlns first
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if (name === 'xmlns') {
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return 3;
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}
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// xmlns:* attributes second
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if (name.startsWith('xmlns:')) {
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return 2;
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}
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}
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// other namespaces after and sort them alphabetically
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if (name.includes(':')) {
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return 1;
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}
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// other attributes
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return 0;
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};
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/**
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* @type {(a: [string, string], b: [string, string]) => number}
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*/
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const compareAttrs = ([aName], [bName]) => {
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// sort namespaces
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const aPriority = getNsPriority(aName);
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const bPriority = getNsPriority(bName);
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const priorityNs = bPriority - aPriority;
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if (priorityNs !== 0) {
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return priorityNs;
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}
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// extract the first part from attributes
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// for example "fill" from "fill" and "fill-opacity"
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const [aPart] = aName.split('-');
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const [bPart] = bName.split('-');
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// rely on alphabetical sort when the first part is the same
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if (aPart !== bPart) {
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const aInOrderFlag = order.includes(aPart) ? 1 : 0;
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const bInOrderFlag = order.includes(bPart) ? 1 : 0;
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// sort by position in order param
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if (aInOrderFlag === 1 && bInOrderFlag === 1) {
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return order.indexOf(aPart) - order.indexOf(bPart);
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}
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// put attributes from order param before others
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const priorityOrder = bInOrderFlag - aInOrderFlag;
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if (priorityOrder !== 0) {
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return priorityOrder;
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}
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}
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// sort alphabetically
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return aName < bName ? -1 : 1;
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};
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return {
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element: {
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enter: (node) => {
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const attrs = Object.entries(node.attributes);
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attrs.sort(compareAttrs);
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/**
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* @type {Record<string, string>}
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*/
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const sortedAttributes = {};
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for (const [name, value] of attrs) {
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sortedAttributes[name] = value;
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}
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node.attributes = sortedAttributes;
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},
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},
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};
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};
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