src/plugins/rssyl/libfeed/parser_atom10.c

   1 /*
   2  * Copyright (C) 2006 Andrej Kacian <andrej@kacian.sk>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public
  15  * License along with this program; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19 #define __USE_GNU
  20
  21 #include <glib.h>
  22 #include <expat.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25
  26 #include "feed.h"
  27 #include "feeditem.h"
  28 #include "date.h"
  29 #include "parser.h"
  30 #include "parser_atom10.h"
  31
  32 void feed_parser_atom10_start(void *data, const gchar *el, const gchar **attr)
  33 {
  34         FeedParserCtx *ctx = (FeedParserCtx *)data;
  35         gchar *a = NULL;
  36
  37         if( ctx->depth == 1 ) {
  38
  39                 if( !strcmp(el, "entry") ) {
  40                         /* Start of new feed item found.
  41                          * Create a new FeedItem, freeing the one we already have, if any. */
  42                         if( ctx->curitem != NULL )
  43                                 feed_item_free(ctx->curitem);
  44                         ctx->curitem = feed_item_new(ctx->feed);
  45                         ctx->location = FEED_LOC_ATOM10_ENTRY;
  46                 } else if( !strcmp(el, "author") ) {
  47                         /* Start of author info for the feed found.
  48                          * Set correct location. */
  49                         ctx->location = FEED_LOC_ATOM10_AUTHOR;
  50                 } else if( !strcmp(el, "link") ) {
  51                         if (!feed_parser_get_attribute_value(attr, "rel")) {
  52                                 /* Link tag for the feed */
  53                                 g_free(ctx->feed->link);
  54                                 ctx->feed->link =
  55                                         g_strdup(feed_parser_get_attribute_value(attr, "href"));
  56                         }
  57                 } else ctx->location = FEED_LOC_ATOM10_NONE;
  58
  59         } else if( ctx->depth == 2 ) {
  60
  61                 /* Make sure we are in one of known locations within the XML structure.
  62                  * This condition should never be true on a valid Atom feed. */
  63                 if (ctx->location != FEED_LOC_ATOM10_AUTHOR &&
  64                                 ctx->location != FEED_LOC_ATOM10_ENTRY) {
  65                         ctx->depth++;
  66                         return;
  67                 }
  68
  69                 if( !strcmp(el, "author") ) {
  70                         /* Start of author info for current feed item.
  71                          * Set correct location. */
  72                         ctx->location = FEED_LOC_ATOM10_AUTHOR;
  73                 } else if( !strcmp(el, "link") ) {
  74                         /* Capture item URL, from the "url" XML attribute. */
  75                         if (ctx->curitem && ctx->location == FEED_LOC_ATOM10_ENTRY)
  76                   ctx->curitem->url = g_strdup(feed_parser_get_attribute_value(attr, "href"));
  77                 } else if( !strcmp(el, "source") ) {
  78                         ctx->location = FEED_LOC_ATOM10_SOURCE;
  79                 } else ctx->location = FEED_LOC_ATOM10_ENTRY;
  80
  81                 if( !strcmp(el, "title") ) {
  82                         a = feed_parser_get_attribute_value(attr, "type");
  83                         if( !a || !strcmp(a, "text") )
  84                                 ctx->curitem->title_format = FEED_ITEM_TITLE_TEXT;
  85                         else if( !strcmp(a, "html") )
  86                                 ctx->curitem->title_format = FEED_ITEM_TITLE_HTML;
  87                         else if( !strcmp(a, "xhtml") )
  88                                 ctx->curitem->title_format = FEED_ITEM_TITLE_XHTML;
  89                         else
  90                                 ctx->curitem->title_format = FEED_ITEM_TITLE_UNKNOWN;
  91                 } else if (!strcmp(el, "content") ) {
  92                         a = feed_parser_get_attribute_value(attr, "type");
  93                         if (a && !strcmp(a, "xhtml")) {
  94                                 ctx->curitem->xhtml_content = TRUE;
  95                                 ctx->location = FEED_LOC_ATOM10_CONTENT;
  96                         }
  97                 }
  98         }
  99
 100         ctx->depth++;
 101 }
 102
 103 void feed_parser_atom10_end(void *data, const gchar *el)
 104 {
 105         FeedParserCtx *ctx = (FeedParserCtx *)data;
 106         Feed *feed = ctx->feed;
 107         gchar *text = NULL, *tmp;
 108
 109         if( ctx->str != NULL )
 110                 text = ctx->str->str;
 111         else
 112                 text = "";
 113
 114         switch( ctx->depth ) {
 115
 116                 case 0:
 117                         /* Just in case. */
 118                         break;
 119
 120                 case 1:
 121
 122                         if( !strcmp(el, "feed") ) {
 123                                 /* We have finished parsing the feed, reverse the list
 124                                  * so it's not upside down. */
 125                                 feed->items = g_slist_reverse(ctx->feed->items);
 126                         }
 127
 128                         break;
 129
 130                 case 2:
 131
 132                         /* decide if we just received </entry>, so we can
 133                          * add a complete item to feed */
 134                         if( !strcmp(el, "entry") ) {
 135
 136                                 /* Fix up URL, if it is relative */
 137                                 if (ctx->curitem->url != NULL &&
 138                                                 !strstr(ctx->curitem->url, "://") &&
 139                                                 ctx->feed->link != NULL) {
 140                                         tmp = g_strconcat(ctx->feed->link,
 141                                                         (ctx->curitem->url[0] == '/' ? "" : "/"),
 142                                                         ctx->curitem->url, NULL);
 143                                         feed_item_set_url(ctx->curitem, tmp);
 144                                         g_free(tmp);
 145                                 }
 146
 147                                 /* append the complete feed item */
 148                                 if( ctx->curitem->id && ctx->curitem->title
 149                                                 && ctx->curitem->date_modified ) {
 150                                         feed->items =
 151                                                 g_slist_prepend(feed->items, (gpointer)ctx->curitem);
 152                                 }
 153
 154                                 /* since it's in the linked list, lose this pointer */
 155                                 ctx->curitem = NULL;
 156
 157                         } else if( !strcmp(el, "title") ) {     /* so it wasn't end of item */
 158                                 FILL(feed->title)
 159                         } else if( !strcmp(el, "summary" ) ) {
 160                                 FILL(feed->description)
 161                         } else if( !strcmp(el, "updated" ) ) {
 162                                 feed->date = parseISO8601Date(text);
 163                         }
 164                         /* FIXME: add more later */
 165
 166                         break;
 167
 168                 case 3:
 169
 170                         if( ctx->curitem == NULL )
 171                                 break;
 172
 173                         switch(ctx->location) {
 174
 175                                 /* We're in feed/entry */
 176                                 case FEED_LOC_ATOM10_ENTRY:
 177                                         if( !strcmp(el, "title") ) {
 178                                                 FILL(ctx->curitem->title)
 179                                         } else if( !strcmp(el, "summary") ) {
 180                                                 FILL(ctx->curitem->summary)
 181                                         } else if( !strcmp(el, "content") ) {
 182                                                 if (!ctx->curitem->xhtml_content)
 183                                                         FILL(ctx->curitem->text)
 184                                         } else if( !strcmp(el, "id") ) {
 185                                                 FILL(ctx->curitem->id)
 186                                                 feed_item_set_id_permalink(ctx->curitem, TRUE);
 187                                         } else if( !strcmp(el, "published") ) {
 188                                                 ctx->curitem->date_published = parseISO8601Date(text);
 189                                         } else if( !strcmp(el, "updated") ) {
 190                                                 ctx->curitem->date_modified = parseISO8601Date(text);
 191                                         }
 192
 193                                         break;
 194
 195                                 /* We're in feed/author or about to leave feed/entry/author */
 196                                 case FEED_LOC_ATOM10_AUTHOR:
 197                                         if( !strcmp(el, "author" ) ) {
 198                                                 /* We just finished parsing <author> */
 199                                                 ctx->curitem->author = g_strdup_printf("%s%s%s%s%s",
 200                                                                 ctx->name ? ctx->name : "",
 201                                                                 ctx->name && ctx->mail ? " <" : ctx->mail ? "<" : "",
 202                                                                 ctx->mail ? ctx->mail : "",
 203                                                                 ctx->mail ? ">" : "",
 204                                                                 !ctx->name && !ctx->mail ? "N/A" : "");
 205                                                 ctx->location = FEED_LOC_ATOM10_ENTRY;
 206                                         } else if( !strcmp(el, "name") ) {
 207                                                 FILL(feed->author)
 208                                         }
 209
 210                                         break;
 211                         }
 212
 213                         break;
 214
 215                 case 4:
 216
 217                         if( ctx->curitem == NULL )
 218                                 break;
 219
 220                         switch(ctx->location) {
 221
 222                                 /* We're in feed/entry/author */
 223                                 case FEED_LOC_ATOM10_AUTHOR:
 224                                         if( !strcmp(el, "name") ) {
 225                                                 FILL(ctx->name)
 226                                         } else if( !strcmp(el, "email") ) {
 227                                                 FILL(ctx->mail)
 228                                         }
 229
 230                                         break;
 231
 232                                 /* We're in feed/entry/source */
 233                                 case FEED_LOC_ATOM10_SOURCE:
 234                                         if( !strcmp(el, "title" ) ) {
 235                                                 FILL(ctx->curitem->sourcetitle)
 236                                         } else if( !strcmp(el, "id" ) ) {
 237                                                 FILL(ctx->curitem->sourceid)
 238                                         } else if( !strcmp(el, "updated" ) ) {
 239                                                 ctx->curitem->sourcedate = parseISO8601Date(text);
 240                                         }
 241
 242                                         break;
 243
 244                                 case FEED_LOC_ATOM10_CONTENT:
 245                                         if (!strcmp(el, "div") && ctx->curitem->xhtml_content)
 246                                                 FILL(ctx->curitem->text)
 247                                         break;
 248
 249                                 }
 250
 251
 252                         break;
 253         }
 254
 255         if( ctx->str != NULL ) {
 256                 g_string_free(ctx->str, TRUE);
 257                 ctx->str = NULL;
 258         }
 259         ctx->str = NULL;
 260
 261         ctx->depth--;
 262 }