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81 lines
3.0 KiB
81 lines
3.0 KiB
/* |
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This file is part of Konsole, an X terminal. |
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Copyright 2007-2008 by Robert Knight <robertknight@gmail.com> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301 USA. |
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*/ |
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#ifndef EXTENDEDCHARTABLE_H |
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#define EXTENDEDCHARTABLE_H |
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// Qt |
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#include <QtCore/QHash> |
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namespace Konsole |
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{ |
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/** |
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* A table which stores sequences of unicode characters, referenced |
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* by hash keys. The hash key itself is the same size as a unicode |
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* character ( ushort ) so that it can occupy the same space in |
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* a structure. |
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*/ |
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class ExtendedCharTable |
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{ |
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public: |
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/** Constructs a new character table. */ |
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ExtendedCharTable(); |
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~ExtendedCharTable(); |
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/** |
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* Adds a sequences of unicode characters to the table and returns |
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* a hash code which can be used later to look up the sequence |
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* using lookupExtendedChar() |
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* |
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* If the same sequence already exists in the table, the hash |
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* of the existing sequence will be returned. |
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* |
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* @param unicodePoints An array of unicode character points |
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* @param length Length of @p unicodePoints |
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*/ |
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ushort createExtendedChar(const ushort* unicodePoints , ushort length); |
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/** |
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* Looks up and returns a pointer to a sequence of unicode characters |
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* which was added to the table using createExtendedChar(). |
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* |
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* @param hash The hash key returned by createExtendedChar() |
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* @param length This variable is set to the length of the |
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* character sequence. |
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* |
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* @return A unicode character sequence of size @p length. |
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*/ |
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ushort* lookupExtendedChar(ushort hash , ushort& length) const; |
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/** The global ExtendedCharTable instance. */ |
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static ExtendedCharTable instance; |
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private: |
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// calculates the hash key of a sequence of unicode points of size 'length' |
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ushort extendedCharHash(const ushort* unicodePoints , ushort length) const; |
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// tests whether the entry in the table specified by 'hash' matches the |
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// character sequence 'unicodePoints' of size 'length' |
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bool extendedCharMatch(ushort hash , const ushort* unicodePoints , ushort length) const; |
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// internal, maps hash keys to character sequence buffers. The first ushort |
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// in each value is the length of the buffer, followed by the ushorts in the buffer |
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// themselves. |
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QHash<ushort, ushort*> extendedCharTable; |
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}; |
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} |
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#endif // end of EXTENDEDCHARTABLE_H
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