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- 'use strict';
- var uncurryThis = require('../internals/function-uncurry-this');
- var hasOwn = require('../internals/has-own-property');
-
- var $SyntaxError = SyntaxError;
- var $parseInt = parseInt;
- var fromCharCode = String.fromCharCode;
- var at = uncurryThis(''.charAt);
- var slice = uncurryThis(''.slice);
- var exec = uncurryThis(/./.exec);
-
- var codePoints = {
- '\\"': '"',
- '\\\\': '\\',
- '\\/': '/',
- '\\b': '\b',
- '\\f': '\f',
- '\\n': '\n',
- '\\r': '\r',
- '\\t': '\t'
- };
-
- var IS_4_HEX_DIGITS = /^[\da-f]{4}$/i;
- // eslint-disable-next-line regexp/no-control-character -- safe
- var IS_C0_CONTROL_CODE = /^[\u0000-\u001F]$/;
-
- module.exports = function (source, i) {
- var unterminated = true;
- var value = '';
- while (i < source.length) {
- var chr = at(source, i);
- if (chr === '\\') {
- var twoChars = slice(source, i, i + 2);
- if (hasOwn(codePoints, twoChars)) {
- value += codePoints[twoChars];
- i += 2;
- } else if (twoChars === '\\u') {
- i += 2;
- var fourHexDigits = slice(source, i, i + 4);
- if (!exec(IS_4_HEX_DIGITS, fourHexDigits)) throw new $SyntaxError('Bad Unicode escape at: ' + i);
- value += fromCharCode($parseInt(fourHexDigits, 16));
- i += 4;
- } else throw new $SyntaxError('Unknown escape sequence: "' + twoChars + '"');
- } else if (chr === '"') {
- unterminated = false;
- i++;
- break;
- } else {
- if (exec(IS_C0_CONTROL_CODE, chr)) throw new $SyntaxError('Bad control character in string literal at: ' + i);
- value += chr;
- i++;
- }
- }
- if (unterminated) throw new $SyntaxError('Unterminated string at: ' + i);
- return { value: value, end: i };
- };
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