added if control structure

components/compiler/controlparser.hpp

@@ -0,0 +1,64 @@
+#ifndef COMPILER_CONTROLPARSER_H_INCLUDED
+#define COMPILER_CONTROLPARSER_H_INCLUDED
+
+#include <vector>
+
+#include <components/interpreter/types.hpp>
+
+#include "parser.hpp"
+#include "exprparser.hpp"
+#include "lineparser.hpp"
+
+namespace Compiler
+{
+    class Locals;
+    class Literals;
+    
+    // Control structure parser
+    
+    class ControlParser : public Parser
+    {
+            enum State
+            {
+                StartState,
+                IfState, IfEndState, IfBodyState,
+                IfElseifEndState, IfElseifBodyState,
+                IfElseEndState, IfElseBodyState,
+                IfEndifState
+            };
+            
+            typedef std::vector<Interpreter::Type_Code> Codes;
+            typedef std::vector<std::pair<Codes, Codes> > IfCodes;
+            
+            Locals& mLocals;  
+            Literals& mLiterals;    
+            Codes mCode;
+            Codes mCodeBlock;
+            IfCodes mIfCode; // condition, body
+            LineParser mLineParser;
+            ExprParser mExprParser;
+            State mState;
+                
+        public:
+        
+            ControlParser (ErrorHandler& errorHandler, Context& context, Locals& locals,
+                Literals& literals);
+
+            void appendCode (std::vector<Interpreter::Type_Code>& code) const;
+            ///< store generated code in \æ code.
+
+            virtual bool parseKeyword (int keyword, const TokenLoc& loc, Scanner& scanner);
+            ///< Handle a keyword token.
+            /// \return fetch another token?
+
+            virtual bool parseSpecial (int code, const TokenLoc& loc, Scanner& scanner);
+            ///< Handle a special character token.
+            /// \return fetch another token?
+
+            void reset();
+            ///< Reset parser to clean state.
+    };
+}
+
+#endif
+