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 #include <stdlib.h>
  23 #include <string.h>
  24 #include <glib/gprintf.h>
  25
  26 #include "viking.h"
  27 #include "curl_download.h"
  28
  29 #define GOOGLE_SEARCH_URL_FMT "http://maps.google.com/maps?q=%s&output=js"
  30 #define GOOGLE_SEARCH_PATTERN_1 "{center: {lat: "
  31 #define GOOGLE_SEARCH_PATTERN_2 ",lng: "
  32
  33 static gchar *last_search_str = NULL;
  34 static VikCoord *last_coord = NULL;
  35 static gchar *last_successful_search_str = NULL;
  36
  37 gchar * a_googlesearch_get_search_string_for_this_place(VikWindow *vw)
  38 {
  39   if (!last_coord)
  40     return NULL;
  41
  42   VikViewport *vvp = vik_window_viewport(vw);
  43   VikCoord *cur_center = vik_viewport_get_center(vvp);
  44   if (vik_coord_equals(cur_center, last_coord)) {
  45     return(last_successful_search_str);
  46   }
  47   else
  48     return NULL;
  49 }
  50
  51 static gboolean prompt_try_again(VikWindow *vw)
  52 {
  53   GtkWidget *dialog = NULL;
  54   gboolean ret = TRUE;
  55
  56   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  57   gtk_window_set_title(GTK_WINDOW(dialog), "Search");
  58
  59   GtkWidget *search_label = gtk_label_new("I don't know that place. Do you want another search?");
  60   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  61   gtk_widget_show_all(dialog);
  62
  63   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT )
  64     ret = FALSE;
  65
  66   gtk_widget_destroy(dialog);
  67   return ret;
  68 }
  69
  70 static gchar *  a_prompt_for_search_string(VikWindow *vw)
  71 {
  72   GtkWidget *dialog = NULL;
  73
  74   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  75   gtk_window_set_title(GTK_WINDOW(dialog), "Search");
  76
  77   GtkWidget *search_label = gtk_label_new("Enter address or place name:");
  78   GtkWidget *search_entry = gtk_entry_new();
  79   if (last_search_str)
  80     gtk_entry_set_text(GTK_ENTRY(search_entry), last_search_str);
  81
  82   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  83   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_entry, FALSE, FALSE, 5 );
  84   gtk_widget_show_all(dialog);
  85
  86   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT ) {
  87     gtk_widget_destroy(dialog);
  88     return NULL;
  89   }
  90
  91   gchar *search_str = g_strdup ( gtk_entry_get_text ( GTK_ENTRY(search_entry) ) );
  92
  93   gtk_widget_destroy(dialog);
  94
  95   if (search_str[0] != '\0') {
  96     if (last_search_str)
  97       g_free(last_search_str);
  98     last_search_str = g_strdup(search_str);
  99   }
 100
 101   return(search_str);   /* search_str needs to be freed by caller */
 102 }
 103
 104 static gboolean parse_file_for_latlon(gchar *file_name, struct LatLon *ll)
 105 {
 106   gchar *text, *pat;
 107   GMappedFile *mf;
 108   gsize len;
 109   gboolean found = TRUE;
 110   gchar lat_buf[32], lon_buf[32];
 111   gchar *s;
 112
 113   lat_buf[0] = lon_buf[0] = '\0';
 114
 115   if ((mf = g_mapped_file_new(file_name, FALSE, NULL)) == NULL) {
 116     g_critical("couldn't map temp file\n");
 117     exit(1);
 118   }
 119   len = g_mapped_file_get_length(mf);
 120   text = g_mapped_file_get_contents(mf);
 121
 122   if ((pat = g_strstr_len(text, len, GOOGLE_SEARCH_PATTERN_1)) == NULL) {
 123     found = FALSE;
 124     goto done;
 125   }
 126   pat += strlen(GOOGLE_SEARCH_PATTERN_1);
 127   s = lat_buf;
 128   if (*pat == '-')
 129     *s++ = *pat++;
 130   while ((s < (lat_buf + sizeof(lat_buf))) && (pat < (text + len)) &&
 131           (g_ascii_isdigit(*pat) || (*pat == '.')))
 132     *s++ = *pat++;
 133   *s = '\0';
 134   if ((pat >= (text + len)) || (lat_buf[0] == '\0')) {
 135     found = FALSE;
 136     goto done;
 137   }
 138
 139   if (strncmp(pat, GOOGLE_SEARCH_PATTERN_2, strlen(GOOGLE_SEARCH_PATTERN_2))) {
 140       found = FALSE;
 141       goto done;
 142   }
 143
 144   pat += strlen(GOOGLE_SEARCH_PATTERN_2);
 145   s = lon_buf;
 146
 147   if (*pat == '-')
 148     *s++ = *pat++;
 149   while ((s < (lon_buf + sizeof(lon_buf))) && (pat < (text + len)) &&
 150           (g_ascii_isdigit(*pat) || (*pat == '.')))
 151     *s++ = *pat++;
 152   *s = '\0';
 153   if ((pat >= (text + len)) || (lon_buf[0] == '\0')) {
 154     found = FALSE;
 155     goto done;
 156   }
 157
 158   ll->lat = g_ascii_strtod(lat_buf, NULL);
 159   ll->lon = g_ascii_strtod(lon_buf, NULL);
 160
 161 done:
 162   g_mapped_file_free(mf);
 163   return (found);
 164
 165 }
 166
 167 gchar *uri_escape(gchar *str)
 168 {
 169   gchar *esc_str = g_malloc(3*strlen(str));
 170   gchar *dst = esc_str;
 171   gchar *src;
 172
 173   for (src = str; *src; src++) {
 174     if (*src == ' ')
 175      *dst++ = '+';
 176     else if (g_ascii_isalnum(*src))
 177      *dst++ = *src;
 178     else {
 179       g_sprintf(dst, "%%%02X", *src);
 180       dst += 3;
 181     }
 182   }
 183
 184     return(esc_str);
 185 }
 186
 187 static int google_search_get_coord(VikWindow *vw, VikViewport *vvp, gchar *srch_str, VikCoord *coord)
 188 {
 189   FILE *tmp_file;
 190   int tmp_fd;
 191   gchar *tmpname;
 192   gchar *uri;
 193   gchar *escaped_srch_str;
 194   int ret = 0;  /* OK */
 195   struct LatLon ll;
 196
 197   escaped_srch_str = uri_escape(srch_str);
 198
 199   if ((tmp_fd = g_file_open_tmp (NULL, &tmpname, NULL)) == -1) {
 200     g_critical("couldn't open temp file\n");
 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)) {  /* error */
 210     fprintf(stderr, "DEBUG: %s() download error\n", __PRETTY_FUNCTION__);
 211     fclose(tmp_file);
 212     ret = -1;
 213     goto done;
 214   }
 215
 216   fclose(tmp_file);
 217   if (!parse_file_for_latlon(tmpname, &ll)) {
 218     ret = -1;
 219     goto done;
 220   }
 221
 222   vik_coord_load_from_latlon ( coord, vik_viewport_get_coord_mode(vvp), &ll );
 223
 224   if (last_coord)
 225     g_free(last_coord);
 226   last_coord = g_malloc(sizeof(VikCoord));
 227   *last_coord = *coord;
 228   if (last_successful_search_str)
 229     g_free(last_successful_search_str);
 230   last_successful_search_str = g_strdup(last_search_str);
 231
 232 done:
 233   g_free(escaped_srch_str);
 234   g_free(uri);
 235   remove(tmpname);
 236   g_free(tmpname);
 237   return ret;
 238 }
 239
 240 void a_google_search(VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp)
 241 {
 242   VikCoord new_center;
 243   gchar *s_str;
 244   gboolean more = TRUE;
 245
 246   do {
 247     s_str = a_prompt_for_search_string(vw);
 248     if ((!s_str) || (s_str[0] == 0)) {
 249       more = FALSE;
 250     }
 251
 252     else if (!google_search_get_coord(vw, vvp, s_str, &new_center)) {
 253       vik_viewport_set_center_coord(vvp, &new_center);
 254       vik_layers_panel_emit_update(vlp);
 255       more = FALSE;
 256     }
 257     else if (!prompt_try_again(vw))
 258         more = FALSE;
 259     g_free(s_str);
 260   } while (more);
 261 }
 262