58 lines
1.3 KiB
Plaintext
58 lines
1.3 KiB
Plaintext
import {characterEntitiesLegacy} from 'character-entities-legacy'
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import {characterEntitiesHtml4} from 'character-entities-html4'
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import {dangerous} from '../constant/dangerous.js'
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const own = {}.hasOwnProperty
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/**
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* `characterEntitiesHtml4` but inverted.
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*
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* @type {Record<string, string>}
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*/
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const characters = {}
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/** @type {string} */
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let key
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for (key in characterEntitiesHtml4) {
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if (own.call(characterEntitiesHtml4, key)) {
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characters[characterEntitiesHtml4[key]] = key
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}
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}
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const notAlphanumericRegex = /[^\dA-Za-z]/
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/**
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* Configurable ways to encode characters as named references.
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*
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* @param {number} code
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* @param {number} next
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* @param {boolean|undefined} omit
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* @param {boolean|undefined} attribute
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* @returns {string}
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*/
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export function toNamed(code, next, omit, attribute) {
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const character = String.fromCharCode(code)
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if (own.call(characters, character)) {
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const name = characters[character]
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const value = '&' + name
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if (
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omit &&
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characterEntitiesLegacy.includes(name) &&
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!dangerous.includes(name) &&
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(!attribute ||
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(next &&
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next !== 61 /* `=` */ &&
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notAlphanumericRegex.test(String.fromCharCode(next))))
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) {
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return value
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}
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return value + ';'
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}
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return ''
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}
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