more unknown work

__if.cpp

@@ -1,30 +1,34 @@
 #include "__if.h"
 #include "Exception.h"
 #include <iostream>
+#include "Expression.h"
 
 namespace jet {
 
    __if::__if(coreutils::ZString &in, coreutils::MString &out) : Tag(in, out) {
 
-      if(keywordExists(coreutils::ZString("value1"))) {	   
-	 if(keywordExists(coreutils::ZString("expr")))
+      coreutils::MString result;
+
+      if(keywordExists("value1")) {
+	 if(keywordExists("expr"))
 	   throw coreutils::Exception("Either value1 or expr can be specified but not both.");
-	 if(keywordExists(coreutils::ZString("value2"))) {
-	    if(keywordExists(coreutils::ZString("type"))) {
-	       // process here
+	 if(keywordExists("value2")) {
+	    if(keywordExists("type")) {
+
 	    } else
 	      throw coreutils::Exception("type expected if value1 and value2 specified.");
 	 } else
 	   throw coreutils::Exception("value2 required if value1 specified.");
-      } else if(keywordExists(coreutils::ZString("expr"))) {
-	 if(keywordExists(coreutils::ZString("value2")))
+      } else if(keywordExists("expr")) {
+   	   if(keywordExists("value2"))
 	        throw coreutils::Exception("value2 should not be specified with expr.");
-	 if(keywordExists(coreutils::ZString("type")))
+	      if(keywordExists("type"))
 	        throw coreutils::Exception("type should not be specified with expr.");
-	 // process here
+	      result = Expression(keywords["expr"]);
+         std::cout << "result1: " << result << std::endl;
       }
-      
-      if(true) {
+      std::cout << "result2: " << result << std::endl;
+      if(result.boolValue()) {
 	      parseContainer(container);
       }