161 lines
2.8 KiB
C++
161 lines
2.8 KiB
C++
// Copyright 2015 Google Inc. All rights reserved
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef STMT_H_
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#define STMT_H_
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#include <string>
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#include <vector>
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#include "loc.h"
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#include "string_piece.h"
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#include "symtab.h"
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using namespace std;
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class Evaluator;
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class Value;
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enum struct AssignOp {
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EQ,
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COLON_EQ,
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PLUS_EQ,
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QUESTION_EQ,
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};
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enum struct AssignDirective {
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NONE = 0,
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OVERRIDE = 1,
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EXPORT = 2,
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};
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enum struct CondOp {
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IFEQ,
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IFNEQ,
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IFDEF,
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IFNDEF,
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};
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struct Stmt {
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public:
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virtual ~Stmt();
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Loc loc() const { return loc_; }
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void set_loc(Loc loc) { loc_ = loc; }
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StringPiece orig() const { return orig_; }
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virtual void Eval(Evaluator* ev) const = 0;
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virtual string DebugString() const = 0;
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protected:
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Stmt();
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private:
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Loc loc_;
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StringPiece orig_;
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};
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struct RuleStmt : public Stmt {
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Value* expr;
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char term;
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Value* after_term;
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virtual ~RuleStmt();
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virtual void Eval(Evaluator* ev) const;
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virtual string DebugString() const;
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};
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struct AssignStmt : public Stmt {
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Value* lhs;
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Value* rhs;
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StringPiece orig_rhs;
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AssignOp op;
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AssignDirective directive;
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AssignStmt()
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: lhs_sym_cache_(Symbol::IsUninitialized{}) {
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}
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virtual ~AssignStmt();
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virtual void Eval(Evaluator* ev) const;
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virtual string DebugString() const;
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Symbol GetLhsSymbol(Evaluator* ev) const;
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private:
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mutable Symbol lhs_sym_cache_;
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};
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struct CommandStmt : public Stmt {
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Value* expr;
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StringPiece orig;
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virtual ~CommandStmt();
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virtual void Eval(Evaluator* ev) const;
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virtual string DebugString() const;
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};
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struct IfStmt : public Stmt {
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CondOp op;
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Value* lhs;
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Value* rhs;
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vector<Stmt*> true_stmts;
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vector<Stmt*> false_stmts;
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virtual ~IfStmt();
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virtual void Eval(Evaluator* ev) const;
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virtual string DebugString() const;
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};
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struct IncludeStmt : public Stmt {
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Value* expr;
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bool should_exist;
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virtual ~IncludeStmt();
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virtual void Eval(Evaluator* ev) const;
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virtual string DebugString() const;
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};
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struct ExportStmt : public Stmt {
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Value* expr;
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bool is_export;
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virtual ~ExportStmt();
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virtual void Eval(Evaluator* ev) const;
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virtual string DebugString() const;
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};
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struct ParseErrorStmt : public Stmt {
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string msg;
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virtual ~ParseErrorStmt();
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virtual void Eval(Evaluator* ev) const;
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virtual string DebugString() const;
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};
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#endif // STMT_H_
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