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

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+'use strict';
+// adapted from https://github.com/jridgewell/string-dedent
+var getBuiltIn = require('../internals/get-built-in');
+var uncurryThis = require('../internals/function-uncurry-this');
+
+var fromCharCode = String.fromCharCode;
+var fromCodePoint = getBuiltIn('String', 'fromCodePoint');
+var charAt = uncurryThis(''.charAt);
+var charCodeAt = uncurryThis(''.charCodeAt);
+var stringIndexOf = uncurryThis(''.indexOf);
+var stringSlice = uncurryThis(''.slice);
+
+var ZERO_CODE = 48;
+var NINE_CODE = 57;
+var LOWER_A_CODE = 97;
+var LOWER_F_CODE = 102;
+var UPPER_A_CODE = 65;
+var UPPER_F_CODE = 70;
+
+var isDigit = function (str, index) {
+  var c = charCodeAt(str, index);
+  return c >= ZERO_CODE && c <= NINE_CODE;
+};
+
+var parseHex = function (str, index, end) {
+  if (end >= str.length) return -1;
+  var n = 0;
+  for (; index < end; index++) {
+    var c = hexToInt(charCodeAt(str, index));
+    if (c === -1) return -1;
+    n = n * 16 + c;
+  }
+  return n;
+};
+
+var hexToInt = function (c) {
+  if (c >= ZERO_CODE && c <= NINE_CODE) return c - ZERO_CODE;
+  if (c >= LOWER_A_CODE && c <= LOWER_F_CODE) return c - LOWER_A_CODE + 10;
+  if (c >= UPPER_A_CODE && c <= UPPER_F_CODE) return c - UPPER_A_CODE + 10;
+  return -1;
+};
+
+module.exports = function (raw) {
+  var out = '';
+  var start = 0;
+  // We need to find every backslash escape sequence, and cook the escape into a real char.
+  var i = 0;
+  var n;
+  while ((i = stringIndexOf(raw, '\\', i)) > -1) {
+    out += stringSlice(raw, start, i);
+    // If the backslash is the last char of the string, then it was an invalid sequence.
+    // This can't actually happen in a tagged template literal, but could happen if you manually
+    // invoked the tag with an array.
+    if (++i === raw.length) return;
+    var next = charAt(raw, i++);
+    switch (next) {
+      // Escaped control codes need to be individually processed.
+      case 'b':
+        out += '\b';
+        break;
+      case 't':
+        out += '\t';
+        break;
+      case 'n':
+        out += '\n';
+        break;
+      case 'v':
+        out += '\v';
+        break;
+      case 'f':
+        out += '\f';
+        break;
+      case 'r':
+        out += '\r';
+        break;
+      // Escaped line terminators just skip the char.
+      case '\r':
+        // Treat `\r\n` as a single terminator.
+        if (i < raw.length && charAt(raw, i) === '\n') ++i;
+      // break omitted
+      case '\n':
+      case '\u2028':
+      case '\u2029':
+        break;
+      // `\0` is a null control char, but `\0` followed by another digit is an illegal octal escape.
+      case '0':
+        if (isDigit(raw, i)) return;
+        out += '\0';
+        break;
+      // Hex escapes must contain 2 hex chars.
+      case 'x':
+        n = parseHex(raw, i, i + 2);
+        if (n === -1) return;
+        i += 2;
+        out += fromCharCode(n);
+        break;
+      // Unicode escapes contain either 4 chars, or an unlimited number between `{` and `}`.
+      // The hex value must not overflow 0x10FFFF.
+      case 'u':
+        if (i < raw.length && charAt(raw, i) === '{') {
+          var end = stringIndexOf(raw, '}', ++i);
+          if (end === -1) return;
+          n = parseHex(raw, i, end);
+          i = end + 1;
+        } else {
+          n = parseHex(raw, i, i + 4);
+          i += 4;
+        }
+        if (n === -1 || n > 0x10FFFF) return;
+        out += fromCodePoint(n);
+        break;
+      default:
+        if (isDigit(next, 0)) return;
+        out += next;
+    }
+    start = i;
+  }
+  return out + stringSlice(raw, start);
+};