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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef EXPR_H_
#define EXPR_H_
#include <string>
#include <vector>
#include "string_piece.h"
using namespace std;
class Evaluator;
struct Loc;
class Evaluable {
public:
virtual void Eval(Evaluator* ev, string* s) const = 0;
string Eval(Evaluator*) const;
protected:
Evaluable();
virtual ~Evaluable();
};
class Value : public Evaluable {
public:
virtual ~Value();
virtual Value* Compact() { return this; }
virtual bool IsLiteral() const { return false; }
// Only safe after IsLiteral() returns true.
virtual StringPiece GetLiteralValueUnsafe() const { return ""; }
string DebugString() const;
protected:
Value();
virtual string DebugString_() const = 0;
};
enum struct ParseExprOpt {
NORMAL = 0,
DEFINE,
COMMAND,
FUNC,
};
Value* ParseExprImpl(const Loc& loc,
StringPiece s,
const char* terms,
ParseExprOpt opt,
size_t* index_out,
bool trim_right_space = false);
Value* ParseExpr(const Loc& loc,
StringPiece s,
ParseExprOpt opt = ParseExprOpt::NORMAL);
string JoinValues(const vector<Value*>& vals, const char* sep);
Value* NewExpr2(Value* v1, Value* v2);
Value* NewExpr3(Value* v1, Value* v2, Value* v3);
Value* NewLiteral(StringPiece s);
#endif // EXPR_H_
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