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node_modules/core-js/internals/parse-json-string.js

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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 $SyntaxError('Bad Unicode escape at: ' + i);
+        value += fromCharCode($parseInt(fourHexDigits, 16));
+        i += 4;
+      } else throw $SyntaxError('Unknown escape sequence: "' + twoChars + '"');
+    } else if (chr == '"') {
+      unterminated = false;
+      i++;
+      break;
+    } else {
+      if (exec(IS_C0_CONTROL_CODE, chr)) throw $SyntaxError('Bad control character in string literal at: ' + i);
+      value += chr;
+      i++;
+    }
+  }
+  if (unterminated) throw $SyntaxError('Unterminated string at: ' + i);
+  return { value: value, end: i };
+};