119 lines
2.8 KiB
JavaScript
119 lines
2.8 KiB
JavaScript
/* eslint-disable no-cond-assign, default-case */
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const escapeForRegexp = require('escape-string-regexp');
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const URL_PATTERN = /url\(#([^ ]+?)\s*\)/g;
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const defaultPattern = '[id]';
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/**
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* @param {string} id
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* @param {string|Function} pattern
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*/
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function renameId(id, pattern) {
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const result = (typeof pattern === 'function' ? pattern(id) : pattern).toString();
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const re = new RegExp(escapeForRegexp('[id]'), 'g');
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return result.replace(re, id);
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}
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/**
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* @param {string|Function} [pattern]
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* @returns {Function}
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*/
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function plugin(pattern) {
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const p = pattern || defaultPattern;
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return (tree) => {
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const mappedIds = {};
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tree.match({ attrs: { id: /.*/ } }, (node) => {
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const { attrs } = node;
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const currentId = attrs.id;
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const newId = renameId(currentId, p);
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attrs.id = newId;
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mappedIds[currentId] = {
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id: newId,
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referenced: false,
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node
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};
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return node;
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});
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tree.match({ tag: /.*/ }, (node) => {
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const { attrs } = node;
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if (node.tag === 'style') {
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while (true) {
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const content = Array.isArray(node.content) ? node.content.join('') : node.content.toString();
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const match = URL_PATTERN.exec(content);
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if (match === null) {
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break;
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}
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const id = match[1];
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if (mappedIds[id]) {
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mappedIds[id].referenced = true;
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const re = new RegExp(escapeForRegexp(match[0]), 'g');
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node.content = content.replace(re, `url(#${mappedIds[id].id})`);
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}
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}
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}
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if ('attrs' in node === false) {
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return node;
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}
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Object.keys(attrs).forEach((attrName) => {
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const value = attrs[attrName];
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let id;
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let match;
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while ((match = URL_PATTERN.exec(value)) !== null) {
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id = match[1];
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if (mappedIds[id]) {
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mappedIds[id].referenced = true;
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const re = new RegExp(escapeForRegexp(match[0]), 'g');
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attrs[attrName] = value.replace(re, `url(#${mappedIds[id].id})`);
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}
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}
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let idObj;
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switch (attrName) {
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case 'href':
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case 'xlink:href':
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if (value.substring(0, 1) !== '#') {
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break;
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}
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id = value.substring(1);
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idObj = mappedIds[id];
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if (idObj) {
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idObj.referenced = false;
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attrs[attrName] = `#${idObj.id}`;
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}
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break;
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case 'for':
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if (node.tag !== 'label') {
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break;
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}
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id = value;
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idObj = mappedIds[id];
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if (idObj) {
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idObj.referenced = false;
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attrs[attrName] = idObj.id;
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}
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break;
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}
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});
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return node;
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});
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return tree;
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};
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}
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module.exports = plugin;
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