mirror of
https://github.com/pocoproject/poco.git
synced 2024-12-27 03:28:49 +01:00
152 lines
4.4 KiB
C++
152 lines
4.4 KiB
C++
//
|
|
// TextIterator.h
|
|
//
|
|
// $Id: //poco/Main/Foundation/include/Poco/TextIterator.h#2 $
|
|
//
|
|
// Library: Foundation
|
|
// Package: Text
|
|
// Module: TextIterator
|
|
//
|
|
// Definition of the TextIterator class.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person or organization
|
|
// obtaining a copy of the software and accompanying documentation covered by
|
|
// this license (the "Software") to use, reproduce, display, distribute,
|
|
// execute, and transmit the Software, and to prepare derivative works of the
|
|
// Software, and to permit third-parties to whom the Software is furnished to
|
|
// do so, all subject to the following:
|
|
//
|
|
// The copyright notices in the Software and this entire statement, including
|
|
// the above license grant, this restriction and the following disclaimer,
|
|
// must be included in all copies of the Software, in whole or in part, and
|
|
// all derivative works of the Software, unless such copies or derivative
|
|
// works are solely in the form of machine-executable object code generated by
|
|
// a source language processor.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
|
|
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
|
|
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
|
|
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
// DEALINGS IN THE SOFTWARE.
|
|
//
|
|
|
|
|
|
#ifndef Foundation_TextIterator_INCLUDED
|
|
#define Foundation_TextIterator_INCLUDED
|
|
|
|
|
|
#include "Poco/Foundation.h"
|
|
|
|
|
|
namespace Poco {
|
|
|
|
|
|
class TextEncoding;
|
|
|
|
|
|
class Foundation_API TextIterator
|
|
/// An unidirectional iterator for iterating over characters in a string.
|
|
/// The TextIterator uses a TextEncoding object to
|
|
/// work with multi-byte character encodings like UTF-8.
|
|
/// Characters are reported in Unicode.
|
|
///
|
|
/// Example: Count the number of UTF-8 characters in a string.
|
|
///
|
|
/// UTF8Encoding utf8Encoding;
|
|
/// std::string utf8String("....");
|
|
/// TextIterator it(utf8String, utf8Encoding);
|
|
/// TextIterator end(utf8String);
|
|
/// int n = 0;
|
|
/// while (it != end) { ++n; ++it; }
|
|
///
|
|
/// NOTE: When an UTF-16 encoding is used, surrogate pairs will be
|
|
/// reported as two separate characters, due to restrictions of
|
|
/// the TextEncoding class.
|
|
{
|
|
public:
|
|
TextIterator();
|
|
/// Creates an uninitialized TextIterator.
|
|
|
|
TextIterator(const std::string& str, const TextEncoding& encoding);
|
|
/// Creates a TextIterator for the given string.
|
|
/// The encoding object must not be deleted as long as the iterator
|
|
/// is in use.
|
|
|
|
TextIterator(const std::string::const_iterator& begin, const std::string::const_iterator& end, const TextEncoding& encoding);
|
|
/// Creates a TextIterator for the given range.
|
|
/// The encoding object must not be deleted as long as the iterator
|
|
/// is in use.
|
|
|
|
TextIterator(const std::string& str);
|
|
/// Creates an end TextIterator for the given string.
|
|
|
|
TextIterator(const std::string::const_iterator& end);
|
|
/// Creates an end TextIterator.
|
|
|
|
~TextIterator();
|
|
/// Destroys the TextIterator.
|
|
|
|
TextIterator(const TextIterator& it);
|
|
/// Copy constructor.
|
|
|
|
TextIterator& operator = (const TextIterator& it);
|
|
/// Assignment operator.
|
|
|
|
void swap(TextIterator& it);
|
|
/// Swaps the iterator with another one.
|
|
|
|
int operator * () const;
|
|
/// Returns the Unicode value of the current character.
|
|
/// If there is no valid character at the current position,
|
|
/// -1 is returned.
|
|
|
|
TextIterator& operator ++ ();
|
|
/// Prefix increment operator.
|
|
|
|
TextIterator operator ++ (int);
|
|
/// Postfix increment operator.
|
|
|
|
bool operator == (const TextIterator& it) const;
|
|
/// Compares two iterators for equality.
|
|
|
|
bool operator != (const TextIterator& it) const;
|
|
/// Compares two iterators for inequality.
|
|
|
|
private:
|
|
const TextEncoding* _pEncoding;
|
|
std::string::const_iterator _it;
|
|
std::string::const_iterator _end;
|
|
};
|
|
|
|
|
|
//
|
|
// inlines
|
|
//
|
|
inline bool TextIterator::operator == (const TextIterator& it) const
|
|
{
|
|
return _it == it._it;
|
|
}
|
|
|
|
|
|
inline bool TextIterator::operator != (const TextIterator& it) const
|
|
{
|
|
return _it != it._it;
|
|
}
|
|
|
|
|
|
inline void swap(TextIterator& it1, TextIterator& it2)
|
|
{
|
|
it1.swap(it2);
|
|
}
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_TextIterator_INCLUDED
|