gecko-dev/rdf/opendir/gs.c

230 строки
5.2 KiB
C
Исходник Обычный вид История

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
// 39204897
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
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#include <ctype.h>
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#include "rdf-int.h"
#include "gs.h"
typedef struct _TrieNodeStruct {
char c;
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struct _TrieNodeStruct* child;
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struct _TrieNodeStruct* next;
struct _TrieTargetStruct* targets;
} TrieNodeStruct;
typedef TrieNodeStruct* TNS;
typedef struct _TrieTargetStruct {
RDF_Resource label;
RDF_Resource target;
struct _TrieTargetStruct* next;
RDFT db;
} TrieTargetStruct;
typedef TrieTargetStruct* TTS;
static TNS gRootNode = 0;
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int
addTarget (RDFT db, TNS node, RDF_Resource label, RDF_Resource targetNode) {
TTS target ;
int n = 0;
/* for (target = node->targets; target != null; target = target->next) {
if (target->target == targetNode) return 0;
n++;
} */
target = (TTS) fgetMem(sizeof(TrieTargetStruct));
target->next = node->targets;
node->targets = target;
target->label = label;
target->target = targetNode;
target->db = db;
return n;
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}
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TNS
findChildOfChar (TNS node, char c) {
TNS ch = node->child;
char c1 = tolower(c);
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int n = 0;
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while (ch) {
if (c1 == ch->c) return ch;
ch = ch->next;
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n++;
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}
return 0;
}
TNS
findChildOfString (TNS node, char* str) {
size_t size = strlen(str);
size_t n = 0;
while (n < size) {
char c = str[n++];
node = findChildOfChar(node, c);
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if (!node) return 0;
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}
return node;
}
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void RDFGS_AddSearchIndex (RDFT db, char* string, RDF_Resource label, RDF_Resource target) {
size_t size = strlen(string);
size_t n = 0;
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char* stk = 0;
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TNS prev, next;
if (!gRootNode) gRootNode = (TNS) getMem(sizeof(TrieNodeStruct));
prev = gRootNode;
next = 0;
while (n < size) {
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char c = string[n++];
if (!wsCharp(c) && (c != '/')) {
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if (!stk) stk = &string[n-1];
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next = (TNS) findChildOfChar(prev, c);
if (!next) {
next = (TNS)fgetMem(sizeof(TrieNodeStruct));
next->next = prev->child;
prev->child = next;
next->c = tolower(c);
}
prev = next;
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} else if (next) {
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int n = addTarget(db, next, label, target);
stk = 0;
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prev = gRootNode;
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next = 0;
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}
}
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if (next) {
addTarget(db, next, label, target);
prev = gRootNode;
next = 0;
}
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}
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void
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countChildren (TNS node, size_t *n, size_t *m) {
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TNS ch;
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TTS tg ;
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if (node->targets) (*n)++;
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for (tg = node->targets; tg; tg = tg->next) (*m)++;
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ch = node->child;
while (ch) {
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countChildren(ch, n, m);
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ch = ch->next;
}
}
void
fillUpChildren (RDF_Cursor c, TNS node) {
TNS ch;
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if (node->targets) *((TTS*)c->pdata1 + c->count++) = node->targets;
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ch = node->child;
while (ch) {
fillUpChildren(c, ch);
ch = ch->next;
}
}
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RDF_Cursor RDFGS_Search (RDFT db, char* searchString, RDF_Resource label) {
RDF_Cursor c = (RDF_Cursor) getMem(sizeof(RDF_CursorStruct));
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size_t n = 0;
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size_t m = 0;
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c->searchString = searchString;
c->s = label;
c->db = db;
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c->pdata = findChildOfString(gRootNode, searchString);
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if (!c->pdata) return c;
countChildren((TNS)c->pdata, &n, &m);
c->pdata2 = (RDF_Resource*) getMem(sizeof(RDF_Resource) * (m+1));
c->off1 = m;
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if (n > 0) {
c->count = 0;
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c->pdata1 = getMem(sizeof(TTS) * (n+1));
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fillUpChildren(c, (TNS)c->pdata);
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c->count = 1;
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}
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if (c->pdata) c->pdata = ((TNS)c->pdata)->targets;
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return c;
}
void RDFGS_DisposeCursor (RDF_Cursor c) {
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if (c->pdata1) freeMem(c->pdata1);
if (c->pdata2) freeMem(c->pdata2);
freeMem(c);
}
int
alreadyAdded(RDF_Resource node, RDF_Cursor c) {
int n =0;
while (c->pdata2[n] && (n < c->off)) {
if (c->pdata2[n] == node) return 1;
n++;
}
return 0;
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}
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RDF_Resource RDFGS_NextValue (RDF_Cursor c) {
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if (!c->pdata) {
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return 0;
} else {
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TTS currentTTS = (TTS) c->pdata;
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while (currentTTS) {
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if (((!c->s) || (c->s == currentTTS->label)) &&
(!alreadyAdded(currentTTS->target, c))) {
RDF_Resource ans = currentTTS->target;
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c->pdata = currentTTS = currentTTS->next;
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if (!currentTTS && (c->pdata1)) {
c->pdata = ((TTS*)c->pdata1)[c->count++];
}
if (c->off < c->off1) c->pdata2[c->off++] = ans;
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return ans;
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}
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c->pdata = currentTTS = currentTTS->next;
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if (!currentTTS && (c->pdata1)) {
c->pdata = currentTTS = ((TTS*)c->pdata1)[c->count++];
}
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}
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}
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return 0;
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}