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#ifndef VALUE_H_
#define VALUE_H_
#include <memory>
#include <string>
#include <vector>
#include "string_piece.h"
using namespace std;
class Evaluator;
class Evaluable {
public:
virtual void Eval(Evaluator* ev, string* s) const = 0;
virtual shared_ptr<string> Eval(Evaluator*) const;
protected:
Evaluable();
virtual ~Evaluable();
};
class Value : public Evaluable {
public:
virtual ~Value();
virtual Value* Compact() { return this; }
string DebugString() const;
protected:
Value();
virtual string DebugString_() const = 0;
};
enum struct ParseExprOpt {
NORMAL = 0,
DEFINE,
COMMAND,
};
Value* ParseExprImpl(StringPiece s, const char* terms, ParseExprOpt opt,
size_t* index_out, bool trim_right_space = false);
Value* ParseExpr(StringPiece s, ParseExprOpt opt = ParseExprOpt::NORMAL);
string JoinValues(const vector<Value*>& vals, const char* sep);
Value* NewExpr3(Value* v1, Value* v2, Value* v3);
Value* NewLiteral(StringPiece s);
#endif // VALUE_H_
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