ClickHouse/base/poco/Foundation/include/Poco/StringTokenizer.h

//
// StringTokenizer.h
//
// Library: Foundation
// Package: Core
// Module:  StringTokenizer
//
// Definition of the StringTokenizer class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_StringTokenizer_INCLUDED
#define Foundation_StringTokenizer_INCLUDED


#include <cstddef>
#include <vector>
#include "Poco/Exception.h"
#include "Poco/Foundation.h"


namespace Poco
{


class Foundation_API StringTokenizer
/// A simple tokenizer that splits a string into
/// tokens, which are separated by separator characters.
/// An iterator is used to iterate over all tokens.
{
public:
    enum Options
    {
        TOK_IGNORE_EMPTY = 1, /// ignore empty tokens
        TOK_TRIM = 2 /// remove leading and trailing whitespace from tokens
    };

    typedef std::vector<std::string> TokenVec;
    typedef TokenVec::const_iterator Iterator;

    StringTokenizer(const std::string & str, const std::string & separators, int options = 0);
    /// Splits the given string into tokens. The tokens are expected to be
    /// separated by one of the separator characters given in separators.
    /// Additionally, options can be specified:
    ///   * TOK_IGNORE_EMPTY: empty tokens are ignored
    ///   * TOK_TRIM: trailing and leading whitespace is removed from tokens.

    ~StringTokenizer();
    /// Destroys the tokenizer.

    Iterator begin() const;
    Iterator end() const;

    const std::string & operator[](std::size_t index) const;
    /// Returns const reference the index'th token.
    /// Throws a RangeException if the index is out of range.

    std::string & operator[](std::size_t index);
    /// Returns reference to the index'th token.
    /// Throws a RangeException if the index is out of range.

    bool has(const std::string & token) const;
    /// Returns true if token exists, false otherwise.

    std::string::size_type find(const std::string & token, std::string::size_type pos = 0) const;
    /// Returns the index of the first occurrence of the token
    /// starting at position pos.
    /// Throws a NotFoundException if the token is not found.

    std::size_t replace(const std::string & oldToken, const std::string & newToken, std::string::size_type pos = 0);
    /// Starting at position pos, replaces all subsequent tokens having value
    /// equal to oldToken with newToken.
    /// Returns the number of modified tokens.

    std::size_t count() const;
    /// Returns the total number of tokens.

    std::size_t count(const std::string & token) const;
    /// Returns the number of tokens equal to the specified token.

private:
    StringTokenizer(const StringTokenizer &);
    StringTokenizer & operator=(const StringTokenizer &);

    void trim(std::string & token);

    TokenVec _tokens;
};


//
// inlines
//


inline StringTokenizer::Iterator StringTokenizer::begin() const
{
    return _tokens.begin();
}


inline StringTokenizer::Iterator StringTokenizer::end() const
{
    return _tokens.end();
}


inline std::string & StringTokenizer::operator[](std::size_t index)
{
    if (index >= _tokens.size())
        throw RangeException();
    return _tokens[index];
}


inline const std::string & StringTokenizer::operator[](std::size_t index) const
{
    if (index >= _tokens.size())
        throw RangeException();
    return _tokens[index];
}


inline std::size_t StringTokenizer::count() const
{
    return _tokens.size();
}


} // namespace Poco


#endif // Foundation_StringTokenizer_INCLUDED