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127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "rdf-int.h"
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#define SEP '|'
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typedef struct _QuerySegmentStruct {
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RDF_Resource s;
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int num;
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int inversep;
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} QuerySegmentStruct;
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typedef QuerySegmentStruct* QuerySegment;
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QuerySegment*
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parseQuery (char* query, RDF_Resource *root, int *numSegments) {
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int len = strlen(query);
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int count ;
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char* rootURL = getMem(100);
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QuerySegment* ans;
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*numSegments = 0;
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for (count = 0; count < len; count++) {
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if (query[count] != SEP) {
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if (!*numSegments) rootURL[count] = query[count];
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} else
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(*numSegments)++;
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}
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*root = getResource(rootURL, 1);
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freeMem(rootURL);
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ans = (QuerySegment*)getMem(*numSegments * (sizeof(QuerySegment)));
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query = strchr(query, SEP)+1;
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for (count = 0; count < *numSegments; count++) {
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char *surl = getMem(100);
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int num = -1;
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char* nquery = strchr(query, SEP) ;
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QuerySegment nq = (QuerySegment)getMem(sizeof(QuerySegmentStruct));
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if (query[0] == '!') {
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memcpy(surl, query+1, (nquery ? nquery-query-1 : strlen(query)-1));
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nq->inversep = 1;
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} else {
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memcpy(surl, query, (nquery ? nquery-query : strlen(query)));
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}
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if (strchr(surl, '[') && strchr(surl, ']')) {
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int n = strchr(surl, '[') - surl;
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surl[n] = '\0';
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sscanf(&surl[n+1], "%i]", &num);
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if (num == -1) num = 4096;
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nq->s = getResource(surl, 1);
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nq->num = num;
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} else {
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nq->s = getResource(surl, 1);
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nq->num = 4096;
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}
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freeMem(surl);
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ans[count] = nq;
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if (nquery) {
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query = nquery+1;
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} else break;
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}
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return ans;
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}
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char**
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processRDFQuery (char* query) {
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RDF_Resource root;
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int numSegments;
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int count = 0;
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char** ans = NULL;
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QuerySegment* querySegments = parseQuery(query, &root, &numSegments);
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int n = 0;
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QuerySegment current = NULL;
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QuerySegment prev = NULL;
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char** currentValArray = (char**)getMem(sizeof(RDF_Resource)*2);
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char** newValArray = (char**)getMem(4096 * sizeof(RDF_Resource));
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currentValArray[0] = (char*) root;
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for (n = 0; n < numSegments; n++) {
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QuerySegment q = querySegments[n];
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int nc = 0;
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int ansType = ((n == numSegments-1) ? RDF_STRING_TYPE : RDF_RESOURCE_TYPE);
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count = 0;
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for (nc = 0; currentValArray[nc] != NULL; nc++) {
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RDF_Cursor c = getSlotValues(NULL, (RDF_Resource)currentValArray[nc], q->s,
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ansType, q->inversep, 1);
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RDF_Resource ans;
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int lc = 0;
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while (c && (lc++ < q->num) && (ans = nextValue(c))) {
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newValArray[count++] = (char*) ans;
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}
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if (c) disposeCursor(c);
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}
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freeMem(currentValArray);
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currentValArray = newValArray;
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newValArray = (char**) getMem(4096 * sizeof(RDF_Resource));
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}
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freeMem(newValArray);
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if (count > 0) {
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ans = (char**)getMem((count+1) * sizeof(char*));
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memcpy(ans, currentValArray, (count * sizeof(char*)));
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}
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freeMem(currentValArray);
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for (n = 0; n < numSegments; n++) freeMem(querySegments[n]);
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return ans;
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}
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