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#pragma once
#include "ExpressionVisitor.h"
#include <stack>
#include <string>
#include <unordered_map>
class ASTInterpreter : public ExpressionVisitor
{
public:
ASTInterpreter();
~ASTInterpreter();
typedef double value_type;
typedef IPLStack<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;
value_type& ModifyVariable(const IPLString& name);
private:
void RunExpression(const ExpressionPtr& e);
bool EvalToBool(const ExpressionPtr& e);
void EnterScope();
void LeaveScope();
friend struct VariableScope;
ValueStack m_Evaluation;
IPLUnorderedMap<IPLString, ValueStack> m_Variables;
typedef IPLVector<IPLString> Scope;
IPLStack<Scope> m_Scopes;
};
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