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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 STMT_H_
#define STMT_H_
#include <string>
#include <vector>
#include "loc.h"
#include "string_piece.h"
#include "symtab.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 Stmt {
public:
virtual ~Stmt();
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:
Stmt();
private:
Loc loc_;
StringPiece orig_;
};
struct RuleStmt : public Stmt {
Value* expr;
char term;
Value* after_term;
virtual ~RuleStmt();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct AssignStmt : public Stmt {
Value* lhs;
Value* rhs;
StringPiece orig_rhs;
AssignOp op;
AssignDirective directive;
AssignStmt() : lhs_sym_cache_(Symbol::IsUninitialized{}) {}
virtual ~AssignStmt();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
Symbol GetLhsSymbol(Evaluator* ev) const;
private:
mutable Symbol lhs_sym_cache_;
};
struct CommandStmt : public Stmt {
Value* expr;
StringPiece orig;
virtual ~CommandStmt();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct IfStmt : public Stmt {
CondOp op;
Value* lhs;
Value* rhs;
vector<Stmt*> true_stmts;
vector<Stmt*> false_stmts;
virtual ~IfStmt();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct IncludeStmt : public Stmt {
Value* expr;
bool should_exist;
virtual ~IncludeStmt();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct ExportStmt : public Stmt {
Value* expr;
bool is_export;
virtual ~ExportStmt();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
struct ParseErrorStmt : public Stmt {
string msg;
virtual ~ParseErrorStmt();
virtual void Eval(Evaluator* ev) const;
virtual string DebugString() const;
};
#endif // STMT_H_
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