[string] make basic Format function

Author: mydeveloperday

appveyor.yml

@@ -9,6 +9,7 @@ platform:
 
 configuration:
   - Debug
+  - Release
 
 build:
   project: C:/projects/cpp-net-framework/build/cpp-net-framework.sln

src/framework/CMakeLists.txt

@@ -3,6 +3,7 @@ cmake_minimum_required (VERSION 2.6)
 SET(SOURCE
   System.cxx
   System/Object.cxx
+  System/String.cxx
   Path.cxx
   System/IO/FileInfo.cxx
   System/IO/StreamReader.cxx

src/framework/System/Object.cxx

@@ -5,7 +5,7 @@
 namespace System
 {
     /// basic to string operation of all base classes
-    String Object::ToString()
+    String Object::ToString() const
     {
         return String("Object");
     }

src/framework/System/Object.h

@@ -24,7 +24,7 @@ namespace System
         }
 
         /// function to print this object
-        virtual String ToString();
+        virtual String ToString() const;
     };
 }
 

src/framework/System/String.cxx

@@ -0,0 +1,19 @@
+
+#include "String.h"
+
+String String::Format(const String &fmt,const Object &a)
+{
+    String output;
+
+    output=fmt;
+
+    output = output.Replace("{0}",a.ToString());
+
+    return output;
+}
+
+
+String String::Format(const char* fmt,const char* a)
+{
+    return Format(String(fmt),String(a));
+}

src/framework/System/String.h

@@ -286,7 +286,7 @@ namespace System
         }
 
         /// turn the string into a string
-        virtual String ToString()
+        virtual String ToString() const
         {
             return (*this);
         }
@@ -296,6 +296,17 @@ namespace System
         {
             m_str.clear();
         }
+
+        /// TODO change to variable argument
+        /// for now stick with naive implementation
+        /// format a string with parameterizd arguments
+        String Format(const String& fmt,const Object& a);
+        String Format(const String& fmt,const Object& a,const Object& b);
+
+        /// TODO change to variable argument
+        /// for now stick with naive implementation
+        String Format(const char* fmt,const char* a);
+        String Format(const char* fmt,const char* a,const char* b);
     };
 
     /// the plus operator for two strings

src/unittests/String_Test.cxx

@@ -194,3 +194,12 @@ TEST(StringTest, Equals)
     EXPECT_TRUE(String("Hello").Equals("Hello", Ordinal));
     EXPECT_FALSE(String("Hello").Equals("hello", Ordinal));
 }
+
+TEST(StringTest, Format)
+{
+    String s;
+
+    s = s.Format("ABC{0}DEF","ABC");
+
+    EXPECT_EQ(String("ABCABCDEF"),String(s)) << "Wow!" << std::endl;
+}