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