Added a tree interpreter

1 files changed, 44 insertions, 0 deletions

diff --git a/JSImpl/src/ASTInterpreter.h b/JSImpl/src/ASTInterpreter.h
new file mode 100644
index 0000000..1ffecde
--- /dev/null
+++ b/JSImpl/src/ASTInterpreter.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include "ExpressionVisitor.h"
+#include <stack>
+#include <string>
+#include <unordered_map>
+
+class ASTInterpreter : public ExpressionVisitor
+{
+public:
+	ASTInterpreter();
+	~ASTInterpreter();
+
+        typedef double value_type;
+        typedef std::stack<value_type> ValueStack;
+
+        ValueStack Run(Expression* program);
+
+	virtual void Visit(LiteralNull* e) override;
+	virtual void Visit(LiteralUndefined* e) override;
+	virtual void Visit(LiteralString* e) override;
+	virtual void Visit(LiteralNumber* e) override;
+	virtual void Visit(LiteralBoolean* e) override;
+	virtual void Visit(BinaryExpression* e) override;
+	virtual void Visit(UnaryExpression* e) override;
+	virtual void Visit(IdentifierExpression* e) override;
+	virtual void Visit(ListExpression* e) override;
+	virtual void Visit(VariableDefinitionExpression* e) override;
+	virtual void Visit(BlockStatement* e) override;
+	virtual void Visit(LabeledStatement* e) override;
+	virtual void Visit(IfStatement* e) override;
+	virtual void Visit(SwitchStatement* e) override;
+	virtual void Visit(CaseStatement *) override;
+	virtual void Visit(WhileStatement* e) override;
+	virtual void Visit(ForStatement* e) override;
+	virtual void Visit(FunctionDeclaration* e) override;
+	virtual void Visit(TopStatements* e) override;
+	virtual void Visit(EmptyExpression* e) override;
+private:
+        void RunExpression(const ExpressionPtr& e);
+        bool EvalToBool(const ExpressionPtr& e);
+        ValueStack m_Evaluation;
+        std::unordered_map<std::string, ValueStack> m_Variables;
+};