33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
/// <reference lib="dom" />
|
|
|
|
/* global document */
|
|
|
|
const element = document.createElement('i')
|
|
|
|
/**
|
|
* @param {string} value
|
|
* @returns {string | false}
|
|
*/
|
|
export function decodeNamedCharacterReference(value) {
|
|
const characterReference = '&' + value + ';'
|
|
element.innerHTML = characterReference
|
|
const character = element.textContent
|
|
|
|
// Some named character references do not require the closing semicolon
|
|
// (`¬`, for instance), which leads to situations where parsing the assumed
|
|
// named reference of `¬it;` will result in the string `¬it;`.
|
|
// When we encounter a trailing semicolon after parsing, and the character
|
|
// reference to decode was not a semicolon (`;`), we can assume that the
|
|
// matching was not complete.
|
|
if (
|
|
character.charCodeAt(character.length - 1) === 59 /* `;` */ &&
|
|
value !== 'semi'
|
|
) {
|
|
return false
|
|
}
|
|
|
|
// If the decoded string is equal to the input, the character reference was
|
|
// not valid.
|
|
return character === characterReference ? false : character
|
|
}
|