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100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
//
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// StreamTokenizer.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/StreamTokenizer.h#1 $
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//
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// Library: Foundation
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// Package: Streams
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// Module: StreamTokenizer
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//
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// Definition of the StreamTokenizer class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_StreamTokenizer_INCLUDED
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#define Foundation_StreamTokenizer_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Token.h"
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#include <istream>
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#include <vector>
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namespace Poco {
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class Foundation_API StreamTokenizer
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/// A stream tokenizer splits an input stream
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/// into a sequence of tokens of different kinds.
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/// Various token kinds can be registered with
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/// the tokenizer.
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{
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public:
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StreamTokenizer();
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/// Creates a StreamTokenizer with no attached stream.
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StreamTokenizer(std::istream& istr);
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/// Creates a StreamTokenizer with no attached stream.
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virtual ~StreamTokenizer();
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/// Destroys the StreamTokenizer and deletes all
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/// registered tokens.
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void attachToStream(std::istream& istr);
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/// Attaches the tokenizer to an input stream.
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void addToken(Token* pToken);
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/// Adds a token class to the tokenizer. The
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/// tokenizer takes ownership of the token and
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/// deletes it when no longer needed. Comment
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/// and whitespace tokens will be marked as
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/// ignorable, which means that next() will not
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/// return them.
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void addToken(Token* pToken, bool ignore);
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/// Adds a token class to the tokenizer. The
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/// tokenizer takes ownership of the token and
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/// deletes it when no longer needed.
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/// If ignore is true, the token will be marked
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/// as ignorable, which means that next() will
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/// not return it.
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const Token* next();
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/// Extracts the next token from the input stream.
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/// Returns a pointer to an EOFToken if there are
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/// no more characters to read.
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/// Returns a pointer to an InvalidToken if an
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/// invalid character is encountered.
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/// If a token is marked as ignorable, it will not
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/// be returned, and the next token will be
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/// examined.
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/// Never returns a NULL pointer.
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/// You must not delete the token returned by next().
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private:
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struct TokenInfo
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{
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Token* pToken;
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bool ignore;
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};
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typedef std::vector<TokenInfo> TokenVec;
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TokenVec _tokens;
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std::istream* _pIstr;
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InvalidToken _invalidToken;
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EOFToken _eofToken;
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};
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} // namespace Poco
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#endif // Foundation_StreamTokenizer_INCLUDED
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