Work on if, call and system tags.

__if.cpp

@@ -8,7 +8,8 @@ namespace jet {
    __if::__if(coreutils::ZString &in, coreutils::MString &parent, Global &global) : Tag(in, parent, global, "else") {
 
       coreutils::MString result;
-
+      bool booleanResult = false;
+      
       if(variableDefined("value1")) {
 	 if(variableDefined("expr"))
 	   throw coreutils::Exception("Either value1 or expr can be specified but not both.");
@@ -19,15 +20,27 @@ namespace jet {
 	      throw coreutils::Exception("type expected if value1 and value2 specified.");
 	 } else
 	   throw coreutils::Exception("value2 required if value1 specified.");
-	 std::cout << variables["value1"].str() << "' and value2 '" << variables["value2"].str() << "' comparison" << std::endl;
+	 if(!variableDefined("type"))
+	   throw coreutils::Exception("type required for a value1 and value2 comparison.");
+	 int rc = variables["value1"].compare(variables["value2"]);
+	 if(((variables["type"] == "eq") && (rc == 0)) ||
+	    ((variables["type"] == "ne") && (rc != 0)) ||
+	    ((variables["type"] == "lt") && (rc == -1)) || 
+	    ((variables["type"] == "le") && (rc != 1)) ||
+	    ((variables["type"] == "gt") && (rc == 1)) ||
+	    ((variables["type"] == "ge") && (rc != -1)))
+	   booleanResult = true;
+	 else
+	   throw coreutils::Exception("type value must be 'eq','ne','lt','le','gt','ge'.");
       } else if(variableDefined("expr")) {
-   	   if(variableDefined("value2"))
-	        throw coreutils::Exception("value2 should not be specified with expr.");
-	      if(variableDefined("type"))
-	        throw coreutils::Exception("type should not be specified with expr.");
-	      result = Expression(variables["expr"]);
+	 if(variableDefined("value2"))
+	   throw coreutils::Exception("value2 should not be specified with expr.");
+	 if(variableDefined("type"))
+	   throw coreutils::Exception("type should not be specified with expr.");
+	 result = Expression(variables["expr"]);
+	 booleanResult = true;
       }
-      if(result.boolValue()) 
+      if(booleanResult) 
 	processContainer(container);
       else
 	if(hasContainer2)