From df766870acbdadb26573b9d3ead550d9e6653b03 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Rafa=C5=82=20D=C5=82ugo=C5=82=C4=99cki?=
 <rafal@dlugolecki.net.pl>
Date: Sun, 3 May 2015 01:26:01 +0200
Subject: [PATCH] Added mechanism to understand passed Argument value.

---
 include/argument.h | 48 +++++++++++++++++++++++++++++++++++++++++++---
 include/command.h  | 19 ++++++++----------
 2 files changed, 53 insertions(+), 14 deletions(-)

diff --git a/include/argument.h b/include/argument.h
index 3ac1d71..159f5eb 100644
--- a/include/argument.h
+++ b/include/argument.h
@@ -2,6 +2,7 @@
 #define __COMMAND_ARGUMENT_H
 
 #include <string>
+#include <sstream>
 #include <iostream>
 
 #include "parameter.h"
@@ -10,15 +11,22 @@
 namespace command {
     /**
      * Class responsible for handling commandline arguments.
-     * Arguments are required,x non-named parameters of program.
+     * Arguments are required, non-named parameters of program.
+     * Accepts
      *
      * Example:
      *  ./myprog ARGUMENT
      */
     template<typename ArgumentType>
     class Argument : public Parameter, public Callable<ArgumentType> {
+    protected:
+        /** Variable indicating if current Argument was already used or not */
+        bool used = false;
+
+        ArgumentType argument;
     public:
         typedef class Argument Type;
+
         /**
          * Default constructor.
          *
@@ -28,13 +36,47 @@ namespace command {
         Argument(const std::string & description, void (*function)(ArgumentType))
             : Parameter(description), Callable<ArgumentType>(function) {
         }
+
+        /**
+         *
+         */
         virtual ~Argument() { }
 
+        /**
+         *
+         */
         virtual void handle() {
-            this->call(std::string("A"));
+            this->call(argument);
         }
 
-        virtual bool understand(const std::string &) {
+        /**
+         * Method used for checking if Argument understands user value.
+         * If so current Argument is flagged as used, and no more checks against
+         * it will be done in future.
+         *
+         * If conversion from passed value to ArgumentType is impossible, it is
+         * ignored.
+         *
+         * @param argv command line value against which test will be made.
+         *
+         * @return If passed argv is succesfully converted to ArgumentType,
+         *  returns true, and Argument is set as used one. If there was an error
+         *  during conversion, method returns false and can be used to check
+         *  against next value.
+         */
+        virtual bool understand(const std::string & argv) {
+            if (!used) {
+                std::stringstream ss;
+
+                ss << argv;
+                ss >> argument;
+
+                if (!ss.fail()) {
+                    used = true;
+                    return true;
+                }
+            }
+
             return false;
         }
     };
diff --git a/include/command.h b/include/command.h
index 0c18cdf..ec08681 100644
--- a/include/command.h
+++ b/include/command.h
@@ -27,7 +27,6 @@ namespace command {
             : parameters(params) {
 
             matchArguments(argc, argv);
-            invoke();
         }
 
         /**
@@ -42,16 +41,14 @@ namespace command {
         /**
          * Matches user passed arguments with available parameter handlers.
          */
-        void matchArguments(unsigned int , char **) {
-//             param->passUserValue();
-        }
-
-        /**
-         * Invokes passed parameter handlers
-         */
-        void invoke() {
-            for(Parameter *param : parameters) {
-                param->handle();
+        void matchArguments(unsigned int argc, char *argv[]) {
+            for (unsigned int i = 1; i < argc; i++) {
+                for(Parameter *param : parameters) {
+                    if (param->understand(argv[i])) {
+                        param->handle();
+                        break;
+                    }
+                }
             }
         }
     };
-- 
2.30.2