75 lines
1.8 KiB
C++
75 lines
1.8 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 EXPR_H_
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#define EXPR_H_
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#include <string>
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#include <vector>
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#include "string_piece.h"
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using namespace std;
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class Evaluator;
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struct Loc;
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class Evaluable {
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public:
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virtual void Eval(Evaluator* ev, string* s) const = 0;
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string Eval(Evaluator*) const;
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protected:
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Evaluable();
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virtual ~Evaluable();
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};
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class Value : public Evaluable {
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public:
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virtual ~Value();
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virtual Value* Compact() { return this; }
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virtual bool IsLiteral() const { return false; }
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// Only safe after IsLiteral() returns true.
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virtual StringPiece GetLiteralValueUnsafe() const { return ""; }
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string DebugString() const;
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protected:
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Value();
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virtual string DebugString_() const = 0;
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};
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enum struct ParseExprOpt {
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NORMAL = 0,
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DEFINE,
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COMMAND,
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FUNC,
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};
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Value* ParseExprImpl(const Loc& loc, StringPiece s, const char* terms,
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ParseExprOpt opt,
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size_t* index_out, bool trim_right_space = false);
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Value* ParseExpr(const Loc& loc, StringPiece s,
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ParseExprOpt opt = ParseExprOpt::NORMAL);
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string JoinValues(const vector<Value*>& vals, const char* sep);
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Value* NewExpr2(Value* v1, Value* v2);
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Value* NewExpr3(Value* v1, Value* v2, Value* v3);
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Value* NewLiteral(StringPiece s);
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#endif // EXPR_H_
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