@technobuddha/library
Version:
A large library of useful functions
73 lines • 4.89 kB
JavaScript
// cspell:ignore unnnn
/**
* Unescape a string encoded in Javascript style
*
* | Escape Sequence | Character | Hex |
* | -------------------- | ------------------ | -------------------- |
* | \\b | Backspace | 0x08 |
* | \\t | Tab | 0x09 |
* | \\n | Newline | 0x0a |
* | \\v | Vertical Tab | 0x0b |
* | \\f | Form Feed | 0x0c |
* | \\r | Carriage Return | 0x0d |
* | \\" | Double Quote | 0x22 |
* | \\' | Single Quote | 0x27 |
* | \\\\ | Backslash | 0x5c |
* | \\n…n[^1] | Octal Escape | 0x0000-0x01ff |
* | \\xnn | Hexadecimal Escape | 0x0000-0x00ff |
* | \\unnnn | Unicode Escape | 0x00000-0x00ffff |
* | \\u\{code-point\} | Code Point Escape | 0x00000-0x10ffff |
* @param input - the string to unescape
* @returns the string with escapes resolved
* @example
* ```typescript
* unescapeJS('Hello\\nWorld'); // "Hello\nWorld"
* unescapeJS('\\u20ac'); // "€"
* unescapeJS('\\x48\\x65\\x6c\\x6c\\x6f'); // "Hello"
* unescapeJS('\\u{1F600}'); // "😀"
* ```
* @group Programming
* @category Escaping
*/
export function unescapeJS(input) {
return input.replaceAll(
//cspell:ignore bfnrtv
/\\(([bfnrtv"'\\])|([0-7]{1,3})|(x[0-9a-fA-F]{2})|(u[0-9a-fA-F]{4})|(u\{[0-9a-fA-F]{1,}\})|.)/gu, (escape) => {
const c = escape.charAt(1);
if (c === 'b') {
return '\b';
}
if (c === 'f') {
return '\f';
}
if (c === 'n') {
return '\n';
}
if (c === 'r') {
return '\r';
}
if (c === 't') {
return '\t';
}
if (c === 'v') {
return '\v';
}
if (c >= '0' && c <= '7') {
// eslint-disable-next-line unicorn/prefer-code-point
return String.fromCharCode(Number.parseInt(escape.slice(1), 8));
}
if (c === 'x') {
// eslint-disable-next-line unicorn/prefer-code-point
return String.fromCharCode(Number.parseInt(escape.slice(2), 16));
}
if (c === 'u') {
if (escape.charAt(2) === '{') {
return String.fromCodePoint(Number.parseInt(escape.slice(3, -1), 16));
}
// eslint-disable-next-line unicorn/prefer-code-point
return String.fromCharCode(Number.parseInt(escape.slice(2), 16));
}
return escape.slice(1);
});
}
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