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