compareTo

idea/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java

@@ -567,17 +567,17 @@ public class JetTypeInferrer {
                 result = null; // TODO : This is not an expression, in fact!
             }
             else if (comparisonOperations.contains(operationType)) {
-                JetExpression left = expression.getLeft();
-                JetExpression deparenthesized = deparenthesize(left);
-                if (deparenthesized instanceof JetArrayAccessExpression) {
-                    JetArrayAccessExpression arrayAccessExpression = (JetArrayAccessExpression) deparenthesized;
-                    resolveArrayAccessToLValue(arrayAccessExpression, expression.getRight(), expression.getOperationReference());
+                JetType compareToReturnType = getTypeForBinaryCall(expression, "compareTo", scope);
+                if (compareToReturnType != null) {
+                    TypeConstructor constructor = compareToReturnType.getConstructor();
+                    JetStandardLibrary standardLibrary = semanticServices.getStandardLibrary();
+                    TypeConstructor intTypeConstructor = standardLibrary.getInt().getTypeConstructor();
+                    if (constructor.equals(intTypeConstructor)) {
+                        result = standardLibrary.getBooleanType();
+                    } else {
+                        semanticServices.getErrorHandler().structuralError(operationSign.getNode(), "compareTo must return Int, but returns " + compareToReturnType);
+                    }
                 }
-                else {
-                    getType(scope, expression.getRight(), false);
-                    //throw new UnsupportedOperationException();
-                }
-                result = null; // TODO : This is not an expression, in fact!
             } else {
                 semanticServices.getErrorHandler().structuralError(operationSign.getNode(), "Unknown operation");
             }

idea/testData/resolve/ResolveOfInfixExpressions.jet

@@ -59,5 +59,8 @@ fun <T> tt(t : T) : T {
   `inc`++y
   `dec`--y
   y`dec`--
-
+  1 `std::Int.compareTo(Double)`> 2.0
+  1 `std::Int.compareTo(Double)`< 2.0
+  1 `std::Int.compareTo(Double)`>= 2.0
+  1 `std::Int.compareTo(Double)`<= 2.0
 }

idea/tests/org/jetbrains/jet/resolve/JetResolveTest.java

@@ -31,6 +31,7 @@ public class JetResolveTest extends ExtensibleResolveTestCase {
         nameToDescriptor.put("std::Int.plus(Int)", standardFunction(lib.getInt(), "plus", lib.getIntType()));
         FunctionDescriptor descriptorForGet = standardFunction(lib.getArray(), Collections.singletonList(new TypeProjection(lib.getIntType())), "get", lib.getIntType());
         nameToDescriptor.put("std::Array.get(Int)", descriptorForGet.getOriginal());
+        nameToDescriptor.put("std::Int.compareTo(Double)", standardFunction(lib.getInt(), "compareTo", lib.getDoubleType()));
         @NotNull
         FunctionDescriptor descriptorForSet = standardFunction(lib.getArray(), Collections.singletonList(new TypeProjection(lib.getIntType())), "set", lib.getIntType(), lib.getIntType());
         nameToDescriptor.put("std::Array.set(Int, Int)", descriptorForSet.getOriginal());