untangle fix-regexp-well-known-symbol-logic by moving feature detection to related modules

Author: zloirock

packages/core-js/internals/fix-regexp-well-known-symbol-logic.js

@@ -10,47 +10,7 @@ var createNonEnumerableProperty = require('../internals/create-non-enumerable-pr
 var SPECIES = wellKnownSymbol('species');
 var RegExpPrototype = RegExp.prototype;
 
-var REPLACE_SUPPORTS_NAMED_GROUPS = !fails(function () {
-  // #replace needs built-in support for named groups.
-  // #match works fine because it just return the exec results, even if it has
-  // a "grops" property.
-  var re = /./;
-  re.exec = function () {
-    var result = [];
-    result.groups = { a: '7' };
-    return result;
-  };
-  return ''.replace(re, '$<a>') !== '7';
-});
-
-// IE <= 11 replaces $0 with the whole match, as if it was $&
-// https://stackoverflow.com/questions/6024666/getting-ie-to-replace-a-regex-with-the-literal-string-0
-var REPLACE_KEEPS_$0 = (function () {
-  // eslint-disable-next-line regexp/prefer-escape-replacement-dollar-char -- required for testing
-  return 'a'.replace(/./, '$0') === '$0';
-})();
-
-var REPLACE = wellKnownSymbol('replace');
-// Safari <= 13.0.3(?) substitutes nth capture where n>m with an empty string
-var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = (function () {
-  if (/./[REPLACE]) {
-    return /./[REPLACE]('a', '$0') === '';
-  }
-  return false;
-})();
-
-// Chrome 51 has a buggy "split" implementation when RegExp#exec !== nativeExec
-// Weex JS has frozen built-in prototypes, so use try / catch wrapper
-var SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {
-  // eslint-disable-next-line regexp/no-empty-group -- required for testing
-  var re = /(?:)/;
-  var originalExec = re.exec;
-  re.exec = function () { return originalExec.apply(this, arguments); };
-  var result = 'ab'.split(re);
-  return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';
-});
-
-module.exports = function (KEY, length, exec, sham) {
+module.exports = function (KEY, length, exec, FORCED, sham) {
   var SYMBOL = wellKnownSymbol(KEY);
 
   var DELEGATES_TO_SYMBOL = !fails(function () {
@@ -87,12 +47,7 @@ module.exports = function (KEY, length, exec, sham) {
   if (
     !DELEGATES_TO_SYMBOL ||
     !DELEGATES_TO_EXEC ||
-    (KEY === 'replace' && !(
-      REPLACE_SUPPORTS_NAMED_GROUPS &&
-      REPLACE_KEEPS_$0 &&
-      !REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE
-    )) ||
-    (KEY === 'split' && !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC)
+    FORCED
   ) {
     var nativeRegExpMethod = /./[SYMBOL];
     var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {
@@ -107,9 +62,6 @@ module.exports = function (KEY, length, exec, sham) {
         return { done: true, value: nativeMethod.call(str, regexp, arg2) };
       }
       return { done: false };
-    }, {
-      REPLACE_KEEPS_$0: REPLACE_KEEPS_$0,
-      REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE: REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE
     });
     var stringMethod = methods[0];
     var regexMethod = methods[1];

packages/core-js/modules/es.string.replace.js

@@ -7,18 +7,47 @@ var requireObjectCoercible = require('../internals/require-object-coercible');
 var advanceStringIndex = require('../internals/advance-string-index');
 var getSubstitution = require('../internals/get-substitution');
 var regExpExec = require('../internals/regexp-exec-abstract');
+var fails = require('../internals/fails');
+var wellKnownSymbol = require('../internals/well-known-symbol');
 
+var REPLACE = wellKnownSymbol('replace');
 var max = Math.max;
 var min = Math.min;
 
 var maybeToString = function (it) {
   return it === undefined ? it : String(it);
 };
 
+var REPLACE_SUPPORTS_NAMED_GROUPS = !fails(function () {
+  // #replace needs built-in support for named groups.
+  // #match works fine because it just return the exec results, even if it has
+  // a "groups" property.
+  var re = /./;
+  re.exec = function () {
+    var result = [];
+    result.groups = { a: '7' };
+    return result;
+  };
+  return ''.replace(re, '$<a>') !== '7';
+});
+
+// IE <= 11 replaces $0 with the whole match, as if it was $&
+// https://stackoverflow.com/questions/6024666/getting-ie-to-replace-a-regex-with-the-literal-string-0
+var REPLACE_KEEPS_$0 = (function () {
+  // eslint-disable-next-line regexp/prefer-escape-replacement-dollar-char -- required for testing
+  return 'a'.replace(/./, '$0') === '$0';
+})();
+
+// Safari <= 13.0.3(?) substitutes nth capture where n>m with an empty string
+var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = (function () {
+  if (/./[REPLACE]) {
+    return /./[REPLACE]('a', '$0') === '';
+  }
+  return false;
+})();
+
 // @@replace logic
-fixRegExpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, maybeCallNative, reason) {
-  var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE;
-  var REPLACE_KEEPS_$0 = reason.REPLACE_KEEPS_$0;
+fixRegExpWellKnownSymbolLogic('replace', 2, function (_, nativeReplace, maybeCallNative) {
   var UNSAFE_SUBSTITUTE = REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE ? '$' : '$0';
 
   return [
@@ -95,4 +124,4 @@ fixRegExpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, ma
       return accumulatedResult + S.slice(nextSourcePosition);
     }
   ];
-});
+}, !REPLACE_SUPPORTS_NAMED_GROUPS || !REPLACE_KEEPS_$0 || REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE);

packages/core-js/modules/es.string.split.js

@@ -9,12 +9,24 @@ var toLength = require('../internals/to-length');
 var callRegExpExec = require('../internals/regexp-exec-abstract');
 var regexpExec = require('../internals/regexp-exec');
 var stickyHelpers = require('../internals/regexp-sticky-helpers');
+var fails = require('../internals/fails');
 
 var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
 var arrayPush = [].push;
 var min = Math.min;
 var MAX_UINT32 = 0xFFFFFFFF;
 
+// Chrome 51 has a buggy "split" implementation when RegExp#exec !== nativeExec
+// Weex JS has frozen built-in prototypes, so use try / catch wrapper
+var SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {
+  // eslint-disable-next-line regexp/no-empty-group -- required for testing
+  var re = /(?:)/;
+  var originalExec = re.exec;
+  re.exec = function () { return originalExec.apply(this, arguments); };
+  var result = 'ab'.split(re);
+  return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';
+});
+
 // @@split logic
 fixRegExpWellKnownSymbolLogic('split', 2, function (SPLIT, nativeSplit, maybeCallNative) {
   var internalSplit;
@@ -131,4 +143,4 @@ fixRegExpWellKnownSymbolLogic('split', 2, function (SPLIT, nativeSplit, maybeCal
       return A;
     }
   ];
-}, UNSUPPORTED_Y);
+}, !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC, UNSUPPORTED_Y);