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77 lines
2.0 KiB
77 lines
2.0 KiB
// 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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// All NewExpr calls take ownership of the Value instances. |
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static Value* NewExpr(Value* v1, Value* v2); |
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static Value* NewExpr(Value* v1, Value* v2, Value* v3); |
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static Value* NewExpr(vector<Value*>* values); |
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static Value* NewLiteral(StringPiece s); |
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virtual ~Value(); |
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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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static string DebugString(const Value*); |
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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, |
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StringPiece s, |
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const char* terms, |
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ParseExprOpt opt, |
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size_t* index_out, |
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bool trim_right_space = false); |
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Value* ParseExpr(const Loc& loc, |
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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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#endif // EXPR_H_
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