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// https://github.com/iamakulov/unescape-js/blob/master/src/index.js
/**
* \\ - matches the backslash which indicates the beginning of an escape sequence
* (
* u\{([0-9A-Fa-f]+)\} - first alternative; matches the variable-length hexadecimal escape sequence (\u{ABCD0})
* |
* u([0-9A-Fa-f]{4}) - second alternative; matches the 4-digit hexadecimal escape sequence (\uABCD)
* |
* x([0-9A-Fa-f]{2}) - third alternative; matches the 2-digit hexadecimal escape sequence (\xA5)
* |
* ([1-7][0-7]{0,2}|[0-7]{2,3}) - fourth alternative; matches the up-to-3-digit octal escape sequence (\5 or \512)
* |
* (['"tbrnfv0\\]) - fifth alternative; matches the special escape characters (\t, \n and so on)
* |
* \U([0-9A-Fa-f]+) - sixth alternative; matches the 8-digit hexadecimal escape sequence used by python (\U0001F3B5)
* )
*/
const jsEscapeRegex = /\\(u\{([0-9A-Fa-f]+)\}|u([0-9A-Fa-f]{4})|x([0-9A-Fa-f]{2})|([1-7][0-7]{0,2}|[0-7]{2,3})|(['"tbrnfv0\\]))|\\U([0-9A-Fa-f]{8})/g
const usualEscapeSequences: Record<string, string> = {
'0': '\0',
'b': '\b',
'f': '\f',
'n': '\n',
'r': '\r',
't': '\t',
'v': '\v',
'\'': '\'',
'"': '"',
'\\': '\\',
}
const fromHex = (str: string) => String.fromCodePoint(parseInt(str, 16))
const fromOct = (str: string) => String.fromCodePoint(parseInt(str, 8))
const unescape = (str: string) => {
return str.replace(jsEscapeRegex, (_, __, varHex, longHex, shortHex, octal, specialCharacter, python) => {
if (varHex !== undefined)
return fromHex(varHex)
else if (longHex !== undefined)
return fromHex(longHex)
else if (shortHex !== undefined)
return fromHex(shortHex)
else if (octal !== undefined)
return fromOct(octal)
else if (python !== undefined)
return fromHex(python)
else
return usualEscapeSequences[specialCharacter]
})
}
export default unescape
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