more work on variables.

Global.cpp

@@ -30,5 +30,31 @@ namespace jet {
    void Global::removeSession(coreutils::MString sessionId) {
       sessions.erase(sessionId);
    }
+
+   coreutils::ZString Global::getVariable(coreutils::ZString &variable) {
+      if(variable.ifNext("$[")) {
+	 if(variable.ifNext("!")) {
+	    return variables[renderVariableName(variable)];
+	 } if(variable.ifNext(":")) {
+	    // TODO: should only allow CGI variable name. Allow variable substitution.
+	 } if(variable.ifNext("@")) {
+	    // TODO: should only allow environment variables. Allow substitution.
+	 } else {
+	    return variables[renderVariableName(variable)];
+	 }
+	 throw coreutils::Exception("expected variable name or type designator.");	 
+      } if(variable.ifNext("#[")) {
+	 // TODO: this local variable type has no special naming conventions. We
+	 // just need to do nested variable substitution for the entry.
+	 
+      }
+      throw coreutils::Exception("Expecting a variable initializer ('$[' or '#[').");
+   }
+
+   coreutils::MString Global::renderVariableName(coreutils::ZString &variable) {
+      coreutils::MString name = variable.getTokenInclude("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._-");
+      if(variable.ifNext("]"))
+	return name;
+   }
    
 }