Added support for call expressions in default args.

The conversion of an expression to a string has been moved to the generator because a function may have been renamed or converted to a property.
However, since that string is language-specific, it should be created in the generator anyway. Therefore we should (over time):
1. Move any string manipulation from the pass for default args to the printer for expressions which is in turn used only by the generator;
2. Remove the Statement.String property (when 1. is entirely complete).

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/AST/Expression.cs

@@ -31,8 +31,7 @@ namespace CppSharp.AST
         {
             var printAsHex = IsHexadecimal && Type.IsUnsigned;
             var format = printAsHex ? "x" : string.Empty;
-            var value = Type.IsUnsigned ? Value.ToString(format) :
-                ((long)Value).ToString(format);
+            var value = Value.ToString(format);
             return printAsHex ? "0x" + value : value;
         }
 
@@ -66,6 +65,7 @@ namespace CppSharp.AST
     {
         public CallExpr()
         {
+            Class = StatementClass.Call;
             Arguments = new List<Expression>();
         }
 
@@ -81,6 +81,7 @@ namespace CppSharp.AST
     {
         public CXXConstructExpr()
         {
+            Class = StatementClass.ConstructorReference;
             Arguments = new List<Expression>();
         }
 

src/AST/Statement.cs

@@ -5,6 +5,7 @@
         Any,
         BinaryOperator,
         DeclarationReference,
+        Call,
         ConstructorReference,
         CXXOperatorCall,
         ImplicitCast,

src/Generator/Generators/CSharp/CSharpExpressionPrinter.cs

@@ -1,5 +1,7 @@
-using CppSharp.AST;
+using System.Linq;
+using CppSharp.AST;
 using CppSharp.Types;
+using Type = CppSharp.AST.Type;
 
 namespace CppSharp.Generators.CSharp
 {
@@ -21,20 +23,52 @@ namespace CppSharp.Generators.CSharp
         }
 
     }
-    public class CSharpExpressionPrinter : IExpressionPrinter<CSharpExpressionPrinterResult>,
-        IExpressionVisitor<CSharpExpressionPrinterResult>
+
+    public class CSharpExpressionPrinter : IExpressionPrinter<CSharpExpressionPrinterResult>
+    {
+        public CSharpExpressionPrinter(CSharpTypePrinter typePrinter)
         {
+            this.typePrinter = typePrinter;
+        }
+
         public CSharpExpressionPrinterResult VisitExpression(Expression expr)
         {
-            return new CSharpExpressionPrinterResult()
+            switch (expr.Class)
+            {
+                case StatementClass.Call:
+                    var callExpr = (CallExpr) expr;
+                    switch (callExpr.Declaration.GenerationKind)
+                    {
+                        case GenerationKind.Generate:
+                        case GenerationKind.Link:
+                            return new CSharpExpressionPrinterResult
                             {
-                Value = expr.ToString(),
+                                Value = string.Format("{0}.{1}({2})",
+                                    typePrinter.VisitDeclaration(callExpr.Declaration.Namespace),
+                                    callExpr.Declaration.Name,
+                                    string.Join(", ", callExpr.Arguments.Select(VisitExpression)))
                             };
+                        case GenerationKind.Internal:
+                            // a non-ctor can only be internal if it's been converted to a property
+                            return new CSharpExpressionPrinterResult
+                            {
+                                Value = string.Format("{0}.{1}",
+                                    typePrinter.VisitDeclaration(callExpr.Declaration.Namespace),
+                                    callExpr.Declaration.Name)
+                            };
+                        default:
+                            return new CSharpExpressionPrinterResult { Value = expr.String };
+                    }
+                default:
+                    return new CSharpExpressionPrinterResult { Value = expr.String };
+            }
         }
 
         public string ToString(Type type)
         {
             throw new System.NotImplementedException();
         }
+
+        private readonly CSharpTypePrinter typePrinter;
     }
 }

src/Generator/Generators/CSharp/CSharpGenerator.cs

@@ -12,7 +12,7 @@ namespace CppSharp.Generators.CSharp
         public CSharpGenerator(Driver driver) : base(driver)
         {
             typePrinter = new CSharpTypePrinter(driver);
-            expressionPrinter = new CSharpExpressionPrinter();
+            expressionPrinter = new CSharpExpressionPrinter(typePrinter);
             CppSharp.AST.Type.TypePrinterDelegate += type => type.Visit(typePrinter).Type;
         }
 

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -2065,7 +2065,7 @@ namespace CppSharp.Generators.CSharp
                     string.Join(", ",
                         method.Parameters.Where(
                             p => p.Kind == ParameterKind.Regular).Select(
-                                p => p.Ignore ? p.DefaultArgument.String : p.Name)));
+                                p => p.Ignore ? ExpressionPrinter.VisitExpression(p.DefaultArgument).Value : p.Name)));
             }
 
             if (method.IsPure)
@@ -2145,11 +2145,11 @@ namespace CppSharp.Generators.CSharp
             PopBlock(NewLineKind.BeforeNextBlock);
         }
 
-        private static string OverloadParamNameWithDefValue(Parameter p, ref int index)
+        private string OverloadParamNameWithDefValue(Parameter p, ref int index)
         {
-            return (p.Type.IsPointerToPrimitiveType() && p.Usage == ParameterUsage.InOut && p.HasDefaultValue)
+            return p.Type.IsPointerToPrimitiveType() && p.Usage == ParameterUsage.InOut && p.HasDefaultValue
                 ? "ref param" + index++
-                : p.DefaultArgument.String;
+                : ExpressionPrinter.VisitExpression(p.DefaultArgument).Value;
         }
 
         private void GenerateOverloadCall(Function function)
@@ -2745,7 +2745,7 @@ namespace CppSharp.Generators.CSharp
                 select string.Format("{0}{1} {2}", GetParameterUsage(param.Usage),
                     typeName, param.Name +
                         (param.DefaultArgument == null || !Options.GenerateDefaultValuesForArguments ?
-                            string.Empty : " = " + param.DefaultArgument.String)));
+                            string.Empty : " = " + ExpressionPrinter.VisitExpression(param.DefaultArgument))));
         }
 
         #endregion

src/Generator/Passes/HandleDefaultParamValuesPass.cs

@@ -66,6 +66,9 @@ namespace CppSharp.Passes
             if (CheckForDefaultPointer(desugared, ref result))
                 return true;
 
+            if (expression.Class == StatementClass.Call)
+                return expression.Declaration.Ignore ? false : (bool?) null;
+
             var defaultConstruct = CheckForDefaultConstruct(desugared, expression, ref result);
             if (defaultConstruct != false)
                 return defaultConstruct;

tests/CSharp/CSharp.Tests.cs

@@ -197,6 +197,8 @@ public class CSharpTests : GeneratorTestFixture
             methodsWithDefaultValues.DefaultIntExpressionWithEnum();
             methodsWithDefaultValues.DefaultCtorWithMoreThanOneArg();
             methodsWithDefaultValues.DefaultWithRefManagedLong();
+            methodsWithDefaultValues.DefaultWithFunctionCall();
+            methodsWithDefaultValues.DefaultWithPropertyCall();
         }
     }
 
@@ -238,11 +240,15 @@ public class CSharpTests : GeneratorTestFixture
     public void TestImplicitCtor()
     {
         Foo foo = new Foo { A = 10 };
-        MethodsWithDefaultValues m = foo;
+        using (MethodsWithDefaultValues m = foo)
+        {
             Assert.AreEqual(foo.A, m.A);
-        MethodsWithDefaultValues m1 = 5;
+        }
+        using (MethodsWithDefaultValues m1 = 5)
+        {
             Assert.AreEqual(5, m1.A);
         }
+    }
 
     [Test]
     public void TestStructWithPrivateFields()

tests/CSharp/CSharp.cpp

@@ -43,6 +43,16 @@ void Foo::setNoParams()
 
 const int Foo::rename;
 
+int Foo::makeFunctionCall()
+{
+    return 1;
+}
+
+int Foo::propertyCall()
+{
+    return 1;
+}
+
 const Foo& Bar::operator[](int i) const
 {
     return m_foo;
@@ -484,6 +494,14 @@ void MethodsWithDefaultValues::defaultWithRefManagedLong(long long* i)
 {
 }
 
+void MethodsWithDefaultValues::defaultWithFunctionCall(int f)
+{
+}
+
+void MethodsWithDefaultValues::defaultWithPropertyCall(int f)
+{
+}
+
 int MethodsWithDefaultValues::getA()
 {
     return m_foo.A;

tests/CSharp/CSharp.h

@@ -17,6 +17,8 @@ public:
     void setNoParams();
 
     static const int rename = 5;
+    static int makeFunctionCall();
+    static int propertyCall();
 
 protected:
     int P;
@@ -364,6 +366,8 @@ public:
     void defaultCtorWithMoreThanOneArg(QMargins m = QMargins(0, 0, 0, 0));
     void defaultWithComplexArgs(const QRect& rectangle = QRect(QPoint(0, 0), QSize(-1, -1)));
     void defaultWithRefManagedLong(long long* i = 0);
+    void defaultWithFunctionCall(int f = Foo::makeFunctionCall());
+    void defaultWithPropertyCall(int f = Foo::propertyCall());
     int getA();
 private:
     Foo m_foo;