Expr.hpp

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#pragma once
 
#include "AstGlobal.h"
#include "AstUtil/Object.hpp"
#include "AstUtil/ObjectNamed.hpp"
#include "AstScript/ScriptAPI.hpp"
 
AST_NAMESPACE_BEGIN
 
class Value;   
 
class AST_SCRIPT_API Expr: public ObjectNamed  // 表达式需要名称吗??
{
public:
    using ObjectNamed::ObjectNamed;
    ~Expr() override = default;
 
    virtual void accept(ExprVisitor& visitor) = 0;
 
    virtual Value* eval() const = 0;
 
    Expr* expand() const;
 
    virtual errc_t setValue(Value* val) {return eErrorReadonly;};
 
    virtual errc_t setValueDouble(double val);
 
    virtual errc_t getValueDouble(double& val) const;
 
    virtual std::string getExpression(Object* context=nullptr) const = 0;
};
 
 
AST_NAMESPACE_END