152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
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* Copyright (C) 2021-2022 Espen Jürgensen <espenjurgensen@gmail.com>
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*
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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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*
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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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*
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <limits.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include "smartpl_query.h"
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#include "parsers/smartpl_parser.h"
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#include "logger.h"
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#include "misc.h"
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#define SMARTPL_SIZE_MAX 8192
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int
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smartpl_query_parse_file(struct smartpl *smartpl, const char *file)
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{
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char *expression = NULL;
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size_t size;
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size_t got;
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int ret;
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FILE *f;
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f = fopen(file, "rb");
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if (!f)
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{
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DPRINTF(E_LOG, L_SCAN, "Could not open smart playlist '%s'\n", file);
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goto error;
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}
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fseek(f, 0, SEEK_END);
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size = ftell(f);
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if (size <= 0 || size > SMARTPL_SIZE_MAX)
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{
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DPRINTF(E_LOG, L_SCAN, "Smart playlist '%s' is zero bytes or too large (max size is %d)\n", file, SMARTPL_SIZE_MAX);
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goto error;
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}
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fseek(f, 0, SEEK_SET);
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CHECK_NULL(L_SCAN, expression = calloc(1, size + 1));
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got = fread(expression, 1, size, f);
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if (got != size)
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{
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DPRINTF(E_LOG, L_SCAN, "Unknown error reading smart playlist '%s'\n", file);
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goto error;
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}
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fclose(f);
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ret = smartpl_query_parse_string(smartpl, expression);
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free(expression);
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return ret;
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error:
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free(expression);
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if (f)
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fclose(f);
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return -1;
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}
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int
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smartpl_query_parse_string(struct smartpl *smartpl, const char *expression)
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{
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struct smartpl_result result;
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if (!expression)
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{
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DPRINTF(E_WARN, L_SCAN, "Parse smartpl query input is null\n");
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return -1;
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}
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DPRINTF(E_SPAM, L_SCAN, "Parse smartpl query input '%s'\n", expression);
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if (smartpl_lex_parse(&result, expression) != 0)
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{
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DPRINTF(E_LOG, L_SCAN, "Could not parse '%s': %s\n", expression, result.errmsg);
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return -1;
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}
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if (result.title[0] == '\0' || !result.where)
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{
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DPRINTF(E_LOG, L_SCAN, "Missing title or filter when parsing '%s'\n", expression);
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return -1;
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}
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free_smartpl(smartpl, 1);
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// Note the fields returned by the smartpl parser will not be prefixed with
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// "f." (unlike the daap parser results and most other queries). The reason is
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// that the smartpl syntax allows the user to request ordering by a calculated
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// field in a group query, and calculated fields are not in the "f" namespace.
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// An example of this happening is if the JSON API search is called with
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// type=album and the smartpl expression has "order+by+time_played+desc".
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smartpl->title = strdup(result.title);
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smartpl->query_where = strdup(result.where);
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smartpl->having = safe_strdup(result.having);
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smartpl->order = safe_strdup(result.order);
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smartpl->limit = result.limit;
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DPRINTF(E_SPAM, L_SCAN, "Parse smartpl query output '%s': WHERE %s HAVING %s ORDER BY %s LIMIT %d\n",
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smartpl->title, smartpl->query_where, smartpl->having, smartpl->order, smartpl->limit);
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return 0;
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}
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void
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free_smartpl(struct smartpl *smartpl, int content_only)
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{
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if (!smartpl)
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return;
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free(smartpl->title);
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free(smartpl->query_where);
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free(smartpl->having);
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free(smartpl->order);
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if (!content_only)
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free(smartpl);
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else
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memset(smartpl, 0, sizeof(struct smartpl));
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}
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