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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 AST_H_
#define AST_H_
#include <string>
#include <vector>
#include "loc.h"
#include "string_piece.h"
using namespace std;
class Evaluator;
class Value;
enum struct AssignOp {
EQ,
COLON_EQ,
PLUS_EQ,
QUESTION_EQ,
};
enum struct AssignDirective {
NONE = 0,
OVERRIDE = 1,
EXPORT = 2,
};
enum struct CondOp {
IFEQ,
IFNEQ,
IFDEF,
IFNDEF,
};
struct AST {
public:
virtual ~AST();
Loc loc() const { return loc_; }
void set_loc(Loc loc) { loc_ = loc; }
StringPiece orig() const { return orig_; }
virtual void Eval(Evaluator* ev) const = 0;
virtual string DebugString() const = 0;
protected:
AST();
private:
Loc loc_;
StringPiece orig_;
};
struct RuleAST : public AST {
Value* expr;
char term;
Value* after_term;
virtual ~RuleAST();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct AssignAST : public AST {
Value* lhs;
Value* rhs;
StringPiece orig_rhs;
AssignOp op;
AssignDirective directive;
virtual ~AssignAST();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct CommandAST : public AST {
Value* expr;
StringPiece orig;
virtual ~CommandAST();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct IfAST : public AST {
CondOp op;
Value* lhs;
Value* rhs;
vector<AST*> true_asts;
vector<AST*> false_asts;
virtual ~IfAST();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct IncludeAST : public AST {
Value* expr;
bool should_exist;
virtual ~IncludeAST();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct ExportAST : public AST {
Value* expr;
bool is_export;
virtual ~ExportAST();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
#endif // AST_H_
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