src/googlesearch.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Created by Quy Tonthat <qtonthat@gmail.com>
  21  */
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <glib.h>
  29 #include <glib/gstdio.h>
  30 #include <glib/gprintf.h>
  31 #include <glib/gi18n.h>
  32
  33 #include "viking.h"
  34 #include "util.h"
  35 #include "curl_download.h"
  36
  37 #define GOOGLE_SEARCH_URL_FMT "http://maps.google.com/maps?q=%s&output=js"
  38 #define GOOGLE_SEARCH_PATTERN_1 "{center:{lat:"
  39 #define GOOGLE_SEARCH_PATTERN_2 ",lng:"
  40 #define GOOGLE_SEARCH_NOT_FOUND "not understand the location"
  41
  42 static gchar *last_search_str = NULL;
  43 static VikCoord *last_coord = NULL;
  44 static gchar *last_successful_search_str = NULL;
  45
  46 static DownloadOptions googlesearch_options = { "http://maps.google.com/", 0, a_check_map_file };
  47
  48 gchar * a_googlesearch_get_search_string_for_this_place(VikWindow *vw)
  49 {
  50   if (!last_coord)
  51     return NULL;
  52
  53   VikViewport *vvp = vik_window_viewport(vw);
  54   const VikCoord *cur_center = vik_viewport_get_center(vvp);
  55   if (vik_coord_equals(cur_center, last_coord)) {
  56     return(last_successful_search_str);
  57   }
  58   else
  59     return NULL;
  60 }
  61
  62 static gboolean prompt_try_again(VikWindow *vw)
  63 {
  64   GtkWidget *dialog = NULL;
  65   gboolean ret = TRUE;
  66
  67   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  68   gtk_window_set_title(GTK_WINDOW(dialog), _("Search"));
  69
  70   GtkWidget *search_label = gtk_label_new(_("I don't know that place. Do you want another search?"));
  71   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  72   gtk_widget_show_all(dialog);
  73
  74   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT )
  75     ret = FALSE;
  76
  77   gtk_widget_destroy(dialog);
  78   return ret;
  79 }
  80
  81 static gchar *  a_prompt_for_search_string(VikWindow *vw)
  82 {
  83   GtkWidget *dialog = NULL;
  84
  85   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  86   gtk_window_set_title(GTK_WINDOW(dialog), _("Search"));
  87
  88   GtkWidget *search_label = gtk_label_new(_("Enter address or place name:"));
  89   GtkWidget *search_entry = gtk_entry_new();
  90   if (last_search_str)
  91     gtk_entry_set_text(GTK_ENTRY(search_entry), last_search_str);
  92
  93   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  94   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_entry, FALSE, FALSE, 5 );
  95   gtk_widget_show_all(dialog);
  96
  97   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT ) {
  98     gtk_widget_destroy(dialog);
  99     return NULL;
 100   }
 101
 102   gchar *search_str = g_strdup ( gtk_entry_get_text ( GTK_ENTRY(search_entry) ) );
 103
 104   gtk_widget_destroy(dialog);
 105
 106   if (search_str[0] != '\0') {
 107     if (last_search_str)
 108       g_free(last_search_str);
 109     last_search_str = g_strdup(search_str);
 110   }
 111
 112   return(search_str);   /* search_str needs to be freed by caller */
 113 }
 114
 115 static gboolean parse_file_for_latlon(gchar *file_name, struct LatLon *ll)
 116 {
 117   gchar *text, *pat;
 118   GMappedFile *mf;
 119   gsize len;
 120   gboolean found = TRUE;
 121   gchar lat_buf[32], lon_buf[32];
 122   gchar *s;
 123
 124   lat_buf[0] = lon_buf[0] = '\0';
 125
 126   if ((mf = g_mapped_file_new(file_name, FALSE, NULL)) == NULL) {
 127     g_critical(_("couldn't map temp file"));
 128     exit(1);
 129   }
 130   len = g_mapped_file_get_length(mf);
 131   text = g_mapped_file_get_contents(mf);
 132
 133   if (g_strstr_len(text, len, GOOGLE_SEARCH_NOT_FOUND) != NULL) {
 134     found = FALSE;
 135     goto done;
 136   }
 137
 138   if ((pat = g_strstr_len(text, len, GOOGLE_SEARCH_PATTERN_1)) == NULL) {
 139     found = FALSE;
 140     goto done;
 141   }
 142   pat += strlen(GOOGLE_SEARCH_PATTERN_1);
 143   s = lat_buf;
 144   if (*pat == '-')
 145     *s++ = *pat++;
 146   while ((s < (lat_buf + sizeof(lat_buf))) && (pat < (text + len)) &&
 147           (g_ascii_isdigit(*pat) || (*pat == '.')))
 148     *s++ = *pat++;
 149   *s = '\0';
 150   if ((pat >= (text + len)) || (lat_buf[0] == '\0')) {
 151     found = FALSE;
 152     goto done;
 153   }
 154
 155   if (strncmp(pat, GOOGLE_SEARCH_PATTERN_2, strlen(GOOGLE_SEARCH_PATTERN_2))) {
 156       found = FALSE;
 157       goto done;
 158   }
 159
 160   pat += strlen(GOOGLE_SEARCH_PATTERN_2);
 161   s = lon_buf;
 162
 163   if (*pat == '-')
 164     *s++ = *pat++;
 165   while ((s < (lon_buf + sizeof(lon_buf))) && (pat < (text + len)) &&
 166           (g_ascii_isdigit(*pat) || (*pat == '.')))
 167     *s++ = *pat++;
 168   *s = '\0';
 169   if ((pat >= (text + len)) || (lon_buf[0] == '\0')) {
 170     found = FALSE;
 171     goto done;
 172   }
 173
 174   ll->lat = g_ascii_strtod(lat_buf, NULL);
 175   ll->lon = g_ascii_strtod(lon_buf, NULL);
 176
 177 done:
 178   g_mapped_file_free(mf);
 179   return (found);
 180
 181 }
 182
 183 static int google_search_get_coord(VikWindow *vw, VikViewport *vvp, gchar *srch_str, VikCoord *coord)
 184 {
 185   FILE *tmp_file;
 186   int tmp_fd;
 187   gchar *tmpname;
 188   gchar *uri;
 189   gchar *escaped_srch_str;
 190   int ret = 0;  /* OK */
 191   struct LatLon ll;
 192
 193   g_debug("%s: raw search: %s", __FUNCTION__, srch_str);
 194
 195   escaped_srch_str = uri_escape(srch_str);
 196
 197   g_debug("%s: escaped search: %s", __FUNCTION__, escaped_srch_str);
 198
 199   if ((tmp_fd = g_file_open_tmp ("vikgsearch.XXXXXX", &tmpname, NULL)) == -1) {
 200     g_critical(_("couldn't open temp file"));
 201     exit(1);
 202   }
 203
 204   tmp_file = fdopen(tmp_fd, "r+");
 205   //uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, srch_str);
 206   uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, escaped_srch_str);
 207
 208   /* TODO: curl may not be available */
 209   if (curl_download_uri(uri, tmp_file, &googlesearch_options)) {  /* error */
 210     fclose(tmp_file);
 211     tmp_file = NULL;
 212     ret = -1;
 213     goto done;
 214   }
 215
 216   fclose(tmp_file);
 217   tmp_file = NULL;
 218   if (!parse_file_for_latlon(tmpname, &ll)) {
 219     ret = -1;
 220     goto done;
 221   }
 222
 223   vik_coord_load_from_latlon ( coord, vik_viewport_get_coord_mode(vvp), &ll );
 224
 225   if (last_coord)
 226     g_free(last_coord);
 227   last_coord = g_malloc(sizeof(VikCoord));
 228   *last_coord = *coord;
 229   if (last_successful_search_str)
 230     g_free(last_successful_search_str);
 231   last_successful_search_str = g_strdup(last_search_str);
 232
 233 done:
 234   g_free(escaped_srch_str);
 235   g_free(uri);
 236   g_remove(tmpname);
 237   g_free(tmpname);
 238   return ret;
 239 }
 240
 241 void a_google_search(VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp)
 242 {
 243   VikCoord new_center;
 244   gchar *s_str;
 245   gboolean more = TRUE;
 246
 247   do {
 248     s_str = a_prompt_for_search_string(vw);
 249     if ((!s_str) || (s_str[0] == 0)) {
 250       more = FALSE;
 251     }
 252
 253     else if (!google_search_get_coord(vw, vvp, s_str, &new_center)) {
 254       vik_viewport_set_center_coord(vvp, &new_center);
 255       vik_layers_panel_emit_update(vlp);
 256       more = FALSE;
 257     }
 258     else if (!prompt_try_again(vw))
 259         more = FALSE;
 260     g_free(s_str);
 261   } while (more);
 262 }
 263