mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-15 20:24:07 +00:00
147 lines
3.8 KiB
C++
147 lines
3.8 KiB
C++
//
|
|
// TextBufferIterator.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Text
|
|
// Module: TextBufferIterator
|
|
//
|
|
// Definition of the TextBufferIterator class.
|
|
//
|
|
// Copyright (c) 2010, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_TextBufferIterator_INCLUDED
|
|
#define Foundation_TextBufferIterator_INCLUDED
|
|
|
|
|
|
#include <cstdlib>
|
|
#include "Poco/Foundation.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
class TextEncoding;
|
|
|
|
|
|
class Foundation_API TextBufferIterator
|
|
/// An unidirectional iterator for iterating over characters in a buffer.
|
|
/// The TextBufferIterator 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 buffer.
|
|
///
|
|
/// UTF8Encoding utf8Encoding;
|
|
/// char buffer[] = "...";
|
|
/// TextBufferIterator it(buffer, utf8Encoding);
|
|
/// TextBufferIterator end(it.end());
|
|
/// 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.
|
|
///
|
|
/// For iterating over the characters in a std::string, see the
|
|
/// TextIterator class.
|
|
{
|
|
public:
|
|
TextBufferIterator();
|
|
/// Creates an uninitialized TextBufferIterator.
|
|
|
|
TextBufferIterator(const char * begin, const TextEncoding & encoding);
|
|
/// Creates a TextBufferIterator for the given buffer, which must be 0-terminated.
|
|
/// The encoding object must not be deleted as long as the iterator
|
|
/// is in use.
|
|
|
|
TextBufferIterator(const char * begin, std::size_t size, const TextEncoding & encoding);
|
|
/// Creates a TextBufferIterator for the given buffer with the given size.
|
|
/// The encoding object must not be deleted as long as the iterator
|
|
/// is in use.
|
|
|
|
TextBufferIterator(const char * begin, const char * end, const TextEncoding & encoding);
|
|
/// Creates a TextBufferIterator for the given range.
|
|
/// The encoding object must not be deleted as long as the iterator
|
|
/// is in use.
|
|
|
|
TextBufferIterator(const char * end);
|
|
/// Creates an end TextBufferIterator for the given buffer.
|
|
|
|
~TextBufferIterator();
|
|
/// Destroys the TextBufferIterator.
|
|
|
|
TextBufferIterator(const TextBufferIterator & it);
|
|
/// Copy constructor.
|
|
|
|
TextBufferIterator & operator=(const TextBufferIterator & it);
|
|
/// Assignment operator.
|
|
|
|
void swap(TextBufferIterator & 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.
|
|
|
|
TextBufferIterator & operator++();
|
|
/// Prefix increment operator.
|
|
|
|
TextBufferIterator operator++(int);
|
|
/// Postfix increment operator.
|
|
|
|
bool operator==(const TextBufferIterator & it) const;
|
|
/// Compares two iterators for equality.
|
|
|
|
bool operator!=(const TextBufferIterator & it) const;
|
|
/// Compares two iterators for inequality.
|
|
|
|
TextBufferIterator end() const;
|
|
/// Returns the end iterator for the range handled
|
|
/// by the iterator.
|
|
|
|
private:
|
|
const TextEncoding * _pEncoding;
|
|
const char * _it;
|
|
const char * _end;
|
|
};
|
|
|
|
|
|
//
|
|
// inlines
|
|
//
|
|
inline bool TextBufferIterator::operator==(const TextBufferIterator & it) const
|
|
{
|
|
return _it == it._it;
|
|
}
|
|
|
|
|
|
inline bool TextBufferIterator::operator!=(const TextBufferIterator & it) const
|
|
{
|
|
return _it != it._it;
|
|
}
|
|
|
|
|
|
inline void swap(TextBufferIterator & it1, TextBufferIterator & it2)
|
|
{
|
|
it1.swap(it2);
|
|
}
|
|
|
|
|
|
inline TextBufferIterator TextBufferIterator::end() const
|
|
{
|
|
return TextBufferIterator(_end);
|
|
}
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_TextBufferIterator_INCLUDED
|