Extract 'refineBinaryExpressionType' into TypeSystem.

pkg/analyzer/lib/src/summary/link.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This library is capable of producing linked summaries from unlinked
  * ones (or prelinked ones).  It functions by building a miniature
  * element model to represent the contents of the summaries, and then
  * scanning the element model to gather linked information and adding
  * it to the summary data structures.
@@ skipping 2328 matching lines @@
     stack.length -= n;
     return result;
   }
 
   void _pushBinaryOperatorType(
       DartType left, TokenType operator, DartType right) {
     if (left is InterfaceType) {
       MethodElement method = left.lookUpMethod(operator.lexeme, library);
       if (method != null) {
         DartType type = method.returnType;
-        type = _refineBinaryExpressionType(operator, type, left, right);
+        type = linker.typeSystem.refineBinaryExpressionType(
+            typeProvider, left, operator, right, type);
         stack.add(type);
         return;
       }
     }
     stack.add(DynamicTypeImpl.instance);
   }
 
   /**
    * Extract the property with the given [propertyName], apply the operator
    * with the given [operandType], push the type of applying operand of the
    * given [operandType].
    */
   void _pushPropertyBinaryExpression(DartType targetType, String propertyName,
       TokenType operator, DartType operandType) {
     DartType propertyType = _getPropertyType(targetType, propertyName);
     _pushBinaryOperatorType(propertyType, operator, operandType);
   }
 
-  DartType _refineBinaryExpressionType(TokenType operator, DartType currentType,
-      DartType leftType, DartType rightType) {
-    DartType intType = typeProvider.intType;
-    if (leftType == intType) {
-      // int op double
-      if (operator == TokenType.MINUS ||
-          operator == TokenType.PERCENT ||
-          operator == TokenType.PLUS ||
-          operator == TokenType.STAR) {
-        DartType doubleType = typeProvider.doubleType;
-        if (rightType == doubleType) {
-          return doubleType;
-        }
-      }
-      // int op int
-      if (operator == TokenType.MINUS ||
-          operator == TokenType.PERCENT ||
-          operator == TokenType.PLUS ||
-          operator == TokenType.STAR ||
-          operator == TokenType.TILDE_SLASH) {
-        if (rightType == intType) {
-          return intType;
-        }
-      }
-    }
-    // default
-    return currentType;
-  }
-
   static TokenType _convertAssignOperatorToTokenType(
       UnlinkedExprAssignOperator o) {
     switch (o) {
       case UnlinkedExprAssignOperator.assign:
         return null;
       case UnlinkedExprAssignOperator.ifNull:
         return TokenType.QUESTION_QUESTION;
       case UnlinkedExprAssignOperator.multiply:
         return TokenType.STAR;
       case UnlinkedExprAssignOperator.divide:
@@ skipping 2007 matching lines @@
    * there are no type parameters in scope.
    */
   TypeParameterizedElementForLink get _typeParameterContext;
 
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 
   @override
   String toString() => '$enclosingElement.$name';
 }