author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 06 Jul 2010 15:30:04 +0300 | |
changeset 10 | afe194b6b1cd |
permissions | -rw-r--r-- |
10
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/* |
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#ifndef TINYUTF16_H_ |
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#define TINYUTF16_H_ |
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|
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#include "tinyiterator.h" |
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|
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namespace analysis { |
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|
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namespace tiny { |
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|
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/** |
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* Translates given unicode character as utf16 and |
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* stores utf16 codes in the output stream |
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*/ |
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template <typename Stream> |
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void utf16put(Stream& out, int c) { |
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if ( c >= 0x00010000L ) { |
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c -= 0x00010000L; |
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out<<(wchar_t)(0xd800 + ((c >> 10) & 0x03ffL)); |
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out<<(wchar_t)(0xd800 + (c & 0x03ffL)); |
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} else { |
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out<<(wchar_t)(c); |
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} |
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} |
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|
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/** |
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* Writes unicode characters into the output |
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* stream as utf16 codes. |
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*/ |
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template <typename Output> |
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struct Utf16Output { |
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public: |
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Utf16Output(const Output& out) : out_(out) {}; |
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inline Utf16Output& operator<<(int c) { |
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utf16put(out_, c); |
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return *this; |
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} |
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|
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inline Utf16Output& operator<<(wchar_t c) { |
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return (*this)<<(int)c; |
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} |
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template <typename I> |
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Utf16Output& write(I source, int length) { |
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for (int i = 0; i < length; i++) { |
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(*this)<<source; ++source; |
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} |
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return *this; |
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} |
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template <typename I> |
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Utf16Output& operator<<(I source) { |
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for (;*source; ++source) { |
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(*this)<<*source; |
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} |
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return *this; |
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} |
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private: |
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Output out_; |
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}; |
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|
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/** |
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* Writes unicode characters into the given iterator as utf16 codes |
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*/ |
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template <typename Iterator> |
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struct Utf16Writer : public Utf16Output<IteratorOutput<Iterator> > { |
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public: |
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Utf16Writer(Iterator i) : Utf16Output<IteratorOutput<Iterator> >(IteratorOutput<Iterator>(i)) {} |
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}; |
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/** |
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* Calculates the size of all characters with the iterator as utf16 |
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* code points |
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*/ |
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template<typename Iterator> |
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int utf16size(Iterator i) { |
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int rv = 0; |
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for (;*i; ++i) { |
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rv += (*i >= 0x10000 ? 2 : 1); |
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} |
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return rv; |
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} |
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|
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/** |
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* Reads utf16 code points from given iterator and translates them |
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* as unicode characters. |
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*/ |
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template <typename Iterator> |
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struct Utf16Iterator { |
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public: |
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Utf16Iterator(Iterator i) : i_(i) { |
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operator++(); // cache first character |
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} |
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Utf16Iterator() : i_(), c_(0), offset_(0) {} |
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inline int operator*() const { |
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return c_; |
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}; |
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Utf16Iterator& operator++() { |
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offset_ = i_; |
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c_ = *i_; ++i_; |
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if ( c_ >= 0xd800 && c_ <= 0xdfff ) { |
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int c2 = *i_; ++i_; |
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if ( c2 >= 0xdc00 && c2 <= 0xdfff ){ |
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c_ = (((c_ & 0x03ffL) << 10) | ((c2 & 0x03ffL) << 0)) + 0x00010000L; |
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} |
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} |
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return *this; |
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} |
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operator int() {return offset_;} |
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private: |
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Iterator i_; |
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int c_; // current utf cached |
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int offset_; // characters read |
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}; |
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|
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/** |
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* Copies the iterator content into a wstring |
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*/ |
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template<class Iterator> |
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std::wstring utf16str(Iterator i) { |
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std::wostringstream ret; |
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while (*i) { |
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utf16put(ret, *i); |
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++i; |
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} |
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return ret.str(); |
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} |
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|
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} |
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} |
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|
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#endif /* TINYUTF16_H_ */ |