167 lines
5.3 KiB
C++
167 lines
5.3 KiB
C++
// -*- C++ -*-
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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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Written by James Clark (jjc@jclark.com)
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This file is part of groff.
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groff is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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groff is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with groff; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <assert.h>
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#include <string.h>
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#ifdef TRADITIONAL_CPP
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#define name2(a,b) a/**/b
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#else /* not TRADITIONAL_CPP */
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#define name2(a,b) name2x(a,b)
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#define name2x(a,b) a ## b
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#endif /* not TRADITIONAL_CPP */
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#define PTABLE(T) name2(T,_ptable)
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#define PASSOC(T) name2(T,_passoc)
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#define PTABLE_ITERATOR(T) name2(T,_ptable_iterator)
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extern unsigned next_ptable_size(unsigned);
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extern unsigned long hash_string(const char *);
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#define declare_ptable(T) \
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\
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struct PASSOC(T) { \
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char *key; \
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T *val; \
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PASSOC(T)(); \
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}; \
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\
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struct PTABLE(T); \
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\
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class PTABLE_ITERATOR(T) { \
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PTABLE(T) *p; \
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unsigned i; \
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public: \
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PTABLE_ITERATOR(T)(PTABLE(T) *); \
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int next(const char **, T **); \
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}; \
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\
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class PTABLE(T) { \
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PASSOC(T) *v; \
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unsigned size; \
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unsigned used; \
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enum { FULL_NUM = 2, FULL_DEN = 3, INITIAL_SIZE = 17 }; \
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public: \
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PTABLE(T)(); \
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~PTABLE(T)(); \
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void define(const char *, T *); \
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T *lookup(const char *); \
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friend class PTABLE_ITERATOR(T); \
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};
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#define implement_ptable(T) \
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\
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PASSOC(T)::PASSOC(T)() \
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: key(0), val(0) \
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{ \
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} \
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\
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PTABLE(T)::PTABLE(T)() \
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{ \
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v = new PASSOC(T)[size = INITIAL_SIZE]; \
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used = 0; \
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} \
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\
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PTABLE(T)::~PTABLE(T)() \
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{ \
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for (unsigned i = 0; i < size; i++) { \
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a_delete v[i].key; \
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delete v[i].val; \
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} \
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a_delete v; \
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} \
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\
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void PTABLE(T)::define(const char *key, T *val) \
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{ \
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assert(key != 0); \
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unsigned long h = hash_string(key); \
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for (unsigned n = unsigned(h % size); \
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v[n].key != 0; \
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n = (n == 0 ? size - 1 : n - 1)) \
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if (strcmp(v[n].key, key) == 0) { \
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delete v[n].val; \
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v[n].val = val; \
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return; \
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} \
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if (val == 0) \
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return; \
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if (used*FULL_DEN >= size*FULL_NUM) { \
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PASSOC(T) *oldv = v; \
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unsigned old_size = size; \
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size = next_ptable_size(size); \
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v = new PASSOC(T)[size]; \
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for (unsigned i = 0; i < old_size; i++) \
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if (oldv[i].key != 0) { \
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if (oldv[i].val == 0) \
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a_delete oldv[i].key; \
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else { \
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for (unsigned j = unsigned(hash_string(oldv[i].key) % size); \
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v[j].key != 0; \
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j = (j == 0 ? size - 1 : j - 1)) \
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; \
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v[j].key = oldv[i].key; \
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v[j].val = oldv[i].val; \
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} \
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} \
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for (n = unsigned(h % size); \
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v[n].key != 0; \
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n = (n == 0 ? size - 1 : n - 1)) \
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; \
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a_delete oldv; \
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} \
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char *temp = new char[strlen(key)+1]; \
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strcpy(temp, key); \
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v[n].key = temp; \
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v[n].val = val; \
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used++; \
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} \
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\
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T *PTABLE(T)::lookup(const char *key) \
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{ \
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assert(key != 0); \
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for (unsigned n = unsigned(hash_string(key) % size); \
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v[n].key != 0; \
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n = (n == 0 ? size - 1 : n - 1)) \
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if (strcmp(v[n].key, key) == 0) \
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return v[n].val; \
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return 0; \
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} \
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\
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PTABLE_ITERATOR(T)::PTABLE_ITERATOR(T)(PTABLE(T) *t) \
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: p(t), i(0) \
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{ \
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} \
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\
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int PTABLE_ITERATOR(T)::next(const char **keyp, T **valp) \
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{ \
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unsigned size = p->size; \
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PASSOC(T) *v = p->v; \
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for (; i < size; i++) \
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if (v[i].key != 0) { \
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*keyp = v[i].key; \
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*valp = v[i].val; \
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i++; \
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return 1; \
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} \
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return 0; \
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}
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