Some work on Expressions

inc/AST/ASTVisitor.h

@@ -1,6 +1,7 @@
 #ifndef ASTVISITOR_H
 #define ASTVISITOR_H
 
+#include "ConstantExpression.h"
 #include "VariableDefinition.h"
 #include "ParameterList.h"
 
@@ -9,6 +10,7 @@ public:
 	ASTVisitor();
 	virtual ~ASTVisitor();
 
+	virtual void visit(ConstantExpression* e) = 0;
 	virtual void visit(ParameterList* e) = 0;
 	virtual void visit(VariableDefinition* e) = 0;
 };

inc/AST/ConstantExpression.h

@@ -0,0 +1,19 @@
+#ifndef CONSTANTEXPRESSION_H
+#define CONSTANTEXPRESSION_H
+
+#include "AST/Expression.h"
+#include <string>
+
+class ConstantExpression : public Expression {
+public:
+	ConstantExpression(std::string value);
+	virtual ~ConstantExpression();
+
+	virtual void accept(ASTVisitor* visitor);
+
+	std::string getValue();
+private:
+	std::string value_;
+};
+
+#endif // CONSTANTEXPRESSION_H

inc/AST/Expression.h

@@ -0,0 +1,14 @@
+#ifndef EXPRESSION_H
+#define EXPRESSION_H
+
+#include "AST/ASTElement.h"
+
+class Expression : public ASTElement {
+public:
+	Expression();
+	virtual ~Expression();
+
+	virtual void accept(ASTVisitor* visitor) = 0;
+};
+
+#endif // EXPRESSION_H