'use strict'; /** * @typedef {import('../lib/types').XastElement} XastElement */ const { visitSkip } = require('../lib/xast.js'); const { referencesProps } = require('./_collections.js'); exports.name = 'cleanupIds'; exports.description = 'removes unused IDs and minifies used'; const regReferencesUrl = /\burl\((["'])?#(.+?)\1\)/; const regReferencesHref = /^#(.+?)$/; const regReferencesBegin = /(\D+)\./; const generateIdChars = [ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ]; const maxIdIndex = generateIdChars.length - 1; /** * Check if an ID starts with any one of a list of strings. * * @type {(string: string, prefixes: Array) => boolean} */ const hasStringPrefix = (string, prefixes) => { for (const prefix of prefixes) { if (string.startsWith(prefix)) { return true; } } return false; }; /** * Generate unique minimal ID. * * @type {(currentId: null | Array) => Array} */ const generateId = (currentId) => { if (currentId == null) { return [0]; } currentId[currentId.length - 1] += 1; for (let i = currentId.length - 1; i > 0; i--) { if (currentId[i] > maxIdIndex) { currentId[i] = 0; if (currentId[i - 1] !== undefined) { currentId[i - 1]++; } } } if (currentId[0] > maxIdIndex) { currentId[0] = 0; currentId.unshift(0); } return currentId; }; /** * Get string from generated ID array. * * @type {(arr: Array) => string} */ const getIdString = (arr) => { return arr.map((i) => generateIdChars[i]).join(''); }; /** * Remove unused and minify used IDs * (only if there are no any