SymbolScope.hpp

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#pragma once
 
#include "AstGlobal.h"
#include <unordered_map>
#include <string>
#include <vector>
#include "AstUtil/SharedPtr.hpp"
#include "AstScript/Expr.hpp"
 
AST_NAMESPACE_BEGIN
 
 
 
class AST_SCRIPT_API ISymbolScope
{
public:
    virtual ~ISymbolScope() = default;
 
    virtual errc_t addSymbol(StringView name, Expr* expr) = 0;
 
    virtual Expr* findSymbol(StringView name, bool searchParent = true) const = 0;
 
    virtual Expr* resolveSymbol(StringView name) = 0;
};
 
 
class AST_SCRIPT_API SymbolScope: public ISymbolScope{
public:
    using SymbolMap = std::unordered_map<std::string, SharedPtr<Expr>>;
    using SymbolPair = std::pair<std::string, SharedPtr<Expr>>;
    using SymbolList = std::vector<SymbolPair>;
 
    SymbolScope() = default;
 
    explicit SymbolScope(SymbolScope* parent)
        : parent_(parent)
    {}
 
    ~SymbolScope() = default;
 
public:
    errc_t addSymbol(StringView name, Expr* expr) override;
 
    Expr* findSymbol(StringView name, bool searchParent = true) const override;
 
    Expr* resolveSymbol(StringView name) override;
 
public:
    void setSymbol(StringView name, Expr* expr);
 
    errc_t removeSymbol(StringView name);
 
    bool hasSymbol(StringView name, bool searchParent = true) const;
 
    SymbolList getSymbols() const;
 
    SymbolScope* parent() const;
 
    void setParent(SymbolScope* parent);
 
protected:
    SymbolMap    symbols_;              
    SymbolScope* parent_ = nullptr;     
};
 
AST_NAMESPACE_END