mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-15 20:24:07 +00:00
99 lines
2.5 KiB
C++
99 lines
2.5 KiB
C++
//
|
|
// StreamTokenizer.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Streams
|
|
// Module: StreamTokenizer
|
|
//
|
|
// Definition of the StreamTokenizer class.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_StreamTokenizer_INCLUDED
|
|
#define Foundation_StreamTokenizer_INCLUDED
|
|
|
|
|
|
#include <istream>
|
|
#include <vector>
|
|
#include "Poco/Foundation.h"
|
|
#include "Poco/Token.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
class Foundation_API StreamTokenizer
|
|
/// A stream tokenizer splits an input stream
|
|
/// into a sequence of tokens of different kinds.
|
|
/// Various token kinds can be registered with
|
|
/// the tokenizer.
|
|
{
|
|
public:
|
|
StreamTokenizer();
|
|
/// Creates a StreamTokenizer with no attached stream.
|
|
|
|
StreamTokenizer(std::istream & istr);
|
|
/// Creates a StreamTokenizer with no attached stream.
|
|
|
|
virtual ~StreamTokenizer();
|
|
/// Destroys the StreamTokenizer and deletes all
|
|
/// registered tokens.
|
|
|
|
void attachToStream(std::istream & istr);
|
|
/// Attaches the tokenizer to an input stream.
|
|
|
|
void addToken(Token * pToken);
|
|
/// Adds a token class to the tokenizer. The
|
|
/// tokenizer takes ownership of the token and
|
|
/// deletes it when no longer needed. Comment
|
|
/// and whitespace tokens will be marked as
|
|
/// ignorable, which means that next() will not
|
|
/// return them.
|
|
|
|
void addToken(Token * pToken, bool ignore);
|
|
/// Adds a token class to the tokenizer. The
|
|
/// tokenizer takes ownership of the token and
|
|
/// deletes it when no longer needed.
|
|
/// If ignore is true, the token will be marked
|
|
/// as ignorable, which means that next() will
|
|
/// not return it.
|
|
|
|
const Token * next();
|
|
/// Extracts the next token from the input stream.
|
|
/// Returns a pointer to an EOFToken if there are
|
|
/// no more characters to read.
|
|
/// Returns a pointer to an InvalidToken if an
|
|
/// invalid character is encountered.
|
|
/// If a token is marked as ignorable, it will not
|
|
/// be returned, and the next token will be
|
|
/// examined.
|
|
/// Never returns a NULL pointer.
|
|
/// You must not delete the token returned by next().
|
|
|
|
private:
|
|
struct TokenInfo
|
|
{
|
|
Token * pToken;
|
|
bool ignore;
|
|
};
|
|
|
|
typedef std::vector<TokenInfo> TokenVec;
|
|
|
|
TokenVec _tokens;
|
|
std::istream * _pIstr;
|
|
InvalidToken _invalidToken;
|
|
EOFToken _eofToken;
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_StreamTokenizer_INCLUDED
|