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import {codes} from 'micromark-util-symbol/codes.js'
import {values} from 'micromark-util-symbol/values.js'
/**
* Turn the number (in string form as either hexa- or plain decimal) coming from
* a numeric character reference into a character.
*
* Sort of like `String.fromCharCode(Number.parseInt(value, base))`, but makes
* non-characters and control characters safe.
*
* @param {string} value
* Value to decode.
* @param {number} base
* Numeric base.
* @returns {string}
* Character.
*/
export function decodeNumericCharacterReference(value, base) {
const code = Number.parseInt(value, base)
if (
// C0 except for HT, LF, FF, CR, space.
code < codes.ht ||
code === codes.vt ||
(code > codes.cr && code < codes.space) ||
// Control character (DEL) of C0, and C1 controls.
(code > codes.tilde && code < 160) ||
// Lone high surrogates and low surrogates.
(code > 55295 && code < 57344) ||
// Noncharacters.
(code > 64975 && code < 65008) ||
/* eslint-disable no-bitwise */
(code & 65535) === 65535 ||
(code & 65535) === 65534 ||
/* eslint-enable no-bitwise */
// Out of range
code > 1114111
) {
return values.replacementCharacter
}
return String.fromCharCode(code)
}
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