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Diffstat (limited to 'src/positions.icc')
| -rw-r--r-- | src/positions.icc | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/src/positions.icc b/src/positions.icc new file mode 100644 index 000000000000..c0be81b7c00c --- /dev/null +++ b/src/positions.icc @@ -0,0 +1,285 @@ +/* Inline Functions for positions.{h,cc}. + + Copyright (C) 1989-1998, 2000, 2002 Free Software Foundation, Inc. + Written by Douglas C. Schmidt <schmidt@ics.uci.edu> + and Bruno Haible <bruno@clisp.org>. + + This file is part of GNU GPERF. + + GNU GPERF is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + GNU GPERF is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. + If not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +// This needs: +//#include <string.h> + +/* ---------------------------- Class Positions ---------------------------- */ + +/* Constructors. */ + +INLINE +Positions::Positions () + : _useall (false), + _size (0) +{ +} + +INLINE +Positions::Positions (int pos1) + : _useall (false), + _size (1) +{ + _positions[0] = pos1; +} + +INLINE +Positions::Positions (int pos1, int pos2) + : _useall (false), + _size (2) +{ + _positions[0] = pos1; + _positions[1] = pos2; +} + +/* Copy constructor. */ + +INLINE +Positions::Positions (const Positions& src) + : _useall (src._useall), + _size (src._size) +{ + memcpy (_positions, src._positions, _size * sizeof (_positions[0])); +} + +/* Assignment operator. */ + +INLINE Positions& +Positions::operator= (const Positions& src) +{ + _useall = src._useall; + _size = src._size; + memcpy (_positions, src._positions, _size * sizeof (_positions[0])); + return *this; +} + +/* Accessors. */ + +INLINE bool +Positions::is_useall () const +{ + return _useall; +} + +INLINE int +Positions::operator[] (unsigned int index) const +{ + return _positions[index]; +} + +INLINE unsigned int +Positions::get_size () const +{ + return _size; +} + +/* Write access. */ + +INLINE void +Positions::set_useall (bool useall) +{ + _useall = useall; + if (useall) + { + /* The positions are 0, 1, ..., MAX_KEY_POS-1, in descending order. */ + _size = MAX_KEY_POS; + int *ptr = _positions; + for (int i = MAX_KEY_POS - 1; i >= 0; i--) + *ptr++ = i; + } +} + +INLINE int * +Positions::pointer () +{ + return _positions; +} + +INLINE void +Positions::set_size (unsigned int size) +{ + _size = size; +} + +/* Sorts the array in reverse order. + Returns true if there are no duplicates, false otherwise. */ +INLINE bool +Positions::sort () +{ + if (_useall) + return true; + + /* Bubble sort. */ + bool duplicate_free = true; + int *base = _positions; + unsigned int len = _size; + + for (unsigned int i = 1; i < len; i++) + { + unsigned int j; + int tmp; + + for (j = i, tmp = base[j]; j > 0 && tmp >= base[j - 1]; j--) + if ((base[j] = base[j - 1]) == tmp) /* oh no, a duplicate!!! */ + duplicate_free = false; + + base[j] = tmp; + } + + return duplicate_free; +} + +/* Creates an iterator, returning the positions in descending order. */ +INLINE PositionIterator +Positions::iterator () const +{ + return PositionIterator (*this); +} + +/* Creates an iterator, returning the positions in descending order, + that apply to strings of length <= maxlen. */ +INLINE PositionIterator +Positions::iterator (int maxlen) const +{ + return PositionIterator (*this, maxlen); +} + +/* Creates an iterator, returning the positions in ascending order. */ +INLINE PositionReverseIterator +Positions::reviterator () const +{ + return PositionReverseIterator (*this); +} + +/* Creates an iterator, returning the positions in ascending order, + that apply to strings of length <= maxlen. */ +INLINE PositionReverseIterator +Positions::reviterator (int maxlen) const +{ + return PositionReverseIterator (*this, maxlen); +} + +/* ------------------------- Class PositionIterator ------------------------ */ + +/* Initializes an iterator through POSITIONS. */ +INLINE +PositionIterator::PositionIterator (Positions const& positions) + : _set (positions), + _index (0) +{ +} + +/* Initializes an iterator through POSITIONS, ignoring positions >= maxlen. */ +INLINE +PositionIterator::PositionIterator (Positions const& positions, int maxlen) + : _set (positions) +{ + if (positions._useall) + _index = (maxlen <= Positions::MAX_KEY_POS ? Positions::MAX_KEY_POS - maxlen : 0); + else + { + unsigned int index; + for (index = 0; + index < positions._size && positions._positions[index] >= maxlen; + index++) + ; + _index = index; + } +} + +/* Retrieves the next position, or EOS past the end. */ +INLINE int +PositionIterator::next () +{ + return (_index < _set._size ? _set._positions[_index++] : EOS); +} + +/* Returns the number of remaining positions, i.e. how often next() will + return a value != EOS. */ +INLINE unsigned int +PositionIterator::remaining () const +{ + return _set._size - _index; +} + +/* Copy constructor. */ +INLINE +PositionIterator::PositionIterator (const PositionIterator& src) + : _set (src._set), + _index (src._index) +{ +} + +/* --------------------- Class PositionReverseIterator --------------------- */ + +/* Initializes an iterator through POSITIONS. */ +INLINE +PositionReverseIterator::PositionReverseIterator (Positions const& positions) + : _set (positions), + _index (_set._size), + _minindex (0) +{ +} + +/* Initializes an iterator through POSITIONS, ignoring positions >= maxlen. */ +INLINE +PositionReverseIterator::PositionReverseIterator (Positions const& positions, int maxlen) + : _set (positions), + _index (_set._size) +{ + if (positions._useall) + _minindex = (maxlen <= Positions::MAX_KEY_POS ? Positions::MAX_KEY_POS - maxlen : 0); + else + { + unsigned int index; + for (index = 0; + index < positions._size && positions._positions[index] >= maxlen; + index++) + ; + _minindex = index; + } +} + +/* Retrieves the next position, or EOS past the end. */ +INLINE int +PositionReverseIterator::next () +{ + return (_index > _minindex ? _set._positions[--_index] : EOS); +} + +/* Returns the number of remaining positions, i.e. how often next() will + return a value != EOS. */ +INLINE unsigned int +PositionReverseIterator::remaining () const +{ + return _index - _minindex; +} + +/* Copy constructor. */ +INLINE +PositionReverseIterator::PositionReverseIterator (const PositionReverseIterator& src) + : _set (src._set), + _index (src._index), + _minindex (src._minindex) +{ +} |