1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
3 * Implements hyperlink functionality for Djvu files.
4 * Copyright (C) 2006 Pauli Virtanen <pav@iki.fi>
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, or (at your option)
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.
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.
24 #include <libdjvu/miniexp.h>
25 #include "djvu-document.h"
26 #include "djvu-links.h"
27 #include "djvu-document-private.h"
28 #include "ev-document-links.h"
31 static gboolean number_from_miniexp(miniexp_t sexp, int *number)
33 if (miniexp_numberp (sexp)) {
34 *number = miniexp_to_int (sexp);
41 static gboolean string_from_miniexp(miniexp_t sexp, const char **str)
43 if (miniexp_stringp (sexp)) {
44 *str = miniexp_to_str (sexp);
51 static gboolean number_from_string_10(const gchar *str, guint64 *number)
55 *number = g_ascii_strtoull(str, &end_ptr, 10);
56 if (*end_ptr == '\0') {
64 get_djvu_link_dest (const DjvuDocument *djvu_document, const gchar *link_name, int base_page)
69 /* #pagenum, #+pageoffset, #-pageoffset */
70 if (g_str_has_prefix (link_name, "#")) {
71 if (base_page > 0 && g_str_has_prefix (link_name+1, "+")) {
72 if (number_from_string_10 (link_name + 2, &page_num)) {
73 return ev_link_dest_new_page (base_page + page_num);
75 } else if (base_page > 0 && g_str_has_prefix (link_name+1, "-")) {
76 if (number_from_string_10 (link_name + 2, &page_num)) {
77 return ev_link_dest_new_page (base_page - page_num);
80 if (number_from_string_10 (link_name + 1, &page_num)) {
81 return ev_link_dest_new_page (page_num - 1);
85 /* FIXME: component file identifiers */
92 get_djvu_link_action (const DjvuDocument *djvu_document, const gchar *link_name, int base_page)
94 EvLinkDest *ev_dest = NULL;
95 EvLinkAction *ev_action = NULL;
97 ev_dest = get_djvu_link_dest (djvu_document, link_name, base_page);
100 ev_action = ev_link_action_new_dest (ev_dest);
101 } else if (strstr(link_name, "://") != NULL) {
102 /* It's probably an URI */
103 ev_action = ev_link_action_new_external_uri (link_name);
105 /* FIXME: component file identifiers */
112 str_to_utf8 (const gchar *text)
114 static const gchar *encodings_to_try[2];
115 static gint n_encodings_to_try = 0;
116 gchar *utf8_text = NULL;
119 if (n_encodings_to_try == 0) {
120 const gchar *charset;
121 gboolean charset_is_utf8;
123 charset_is_utf8 = g_get_charset (&charset);
124 if (!charset_is_utf8) {
125 encodings_to_try[n_encodings_to_try++] = charset;
128 if (g_ascii_strcasecmp (charset, "ISO-8859-1") != 0) {
129 encodings_to_try[n_encodings_to_try++] = "ISO-8859-1";
133 for (i = 0; i < n_encodings_to_try; i++) {
134 utf8_text = g_convert (text, -1, "UTF-8",
145 * Builds the index GtkTreeModel from DjVu s-expr
149 * ("title12" "dest12"
157 build_tree (const DjvuDocument *djvu_document,
162 const char *title, *link_dest;
165 EvLinkAction *ev_action = NULL;
166 EvLink *ev_link = NULL;
167 GtkTreeIter tree_iter;
169 if (miniexp_car (iter) == miniexp_symbol ("bookmarks")) {
170 /* The (bookmarks) cons */
171 iter = miniexp_cdr (iter);
172 } else if ( miniexp_length (iter) >= 2 ) {
174 if (!string_from_miniexp (miniexp_car (iter), &title)) goto unknown_entry;
175 if (!string_from_miniexp (miniexp_cadr (iter), &link_dest)) goto unknown_entry;
177 if (!g_utf8_validate (title, -1, NULL)) {
180 utf8_title = str_to_utf8 (title);
181 title_markup = g_markup_escape_text (utf8_title, -1);
184 title_markup = g_markup_escape_text (title, -1);
187 ev_action = get_djvu_link_action (djvu_document, link_dest, -1);
189 if (g_str_has_suffix (link_dest, ".djvu")) {
190 /* FIXME: component file identifiers */
191 } else if (ev_action) {
192 ev_link = ev_link_new (title, ev_action);
193 gtk_tree_store_append (GTK_TREE_STORE (model), &tree_iter, parent);
194 gtk_tree_store_set (GTK_TREE_STORE (model), &tree_iter,
195 EV_DOCUMENT_LINKS_COLUMN_MARKUP, title_markup,
196 EV_DOCUMENT_LINKS_COLUMN_LINK, ev_link,
197 EV_DOCUMENT_LINKS_COLUMN_EXPAND, FALSE,
199 g_object_unref (ev_link);
201 gtk_tree_store_append (GTK_TREE_STORE (model), &tree_iter, parent);
202 gtk_tree_store_set (GTK_TREE_STORE (model), &tree_iter,
203 EV_DOCUMENT_LINKS_COLUMN_MARKUP, title_markup,
204 EV_DOCUMENT_LINKS_COLUMN_EXPAND, FALSE,
208 g_free (title_markup);
210 iter = miniexp_cddr (iter);
216 for (; iter != miniexp_nil; iter = miniexp_cdr (iter)) {
217 build_tree (djvu_document, model, parent, miniexp_car (iter));
222 g_warning ("DjvuLibre error: Unknown entry in bookmarks");
227 get_djvu_hyperlink_area (ddjvu_pageinfo_t *page_info,
229 EvLinkMapping *ev_link_mapping)
232 ddjvu_pageinfo_t info;
236 if ((miniexp_car (iter) == miniexp_symbol ("rect") || miniexp_car (iter) == miniexp_symbol ("oval"))
237 && miniexp_length (iter) == 5) {
238 /* FIXME: get bounding box for (oval) since Evince doesn't support shaped links */
239 int minx, miny, width, height;
241 iter = miniexp_cdr (iter);
242 if (!number_from_miniexp (miniexp_car (iter), &minx)) goto unknown_link;
243 iter = miniexp_cdr (iter);
244 if (!number_from_miniexp (miniexp_car (iter), &miny)) goto unknown_link;
245 iter = miniexp_cdr (iter);
246 if (!number_from_miniexp (miniexp_car (iter), &width)) goto unknown_link;
247 iter = miniexp_cdr (iter);
248 if (!number_from_miniexp (miniexp_car (iter), &height)) goto unknown_link;
250 ev_link_mapping->x1 = minx;
251 ev_link_mapping->x2 = (minx + width);
252 ev_link_mapping->y1 = (page_info->height - (miny + height));
253 ev_link_mapping->y2 = (page_info->height - miny);
254 } else if (miniexp_car (iter) == miniexp_symbol ("poly")
255 && miniexp_length (iter) >= 5 && miniexp_length (iter) % 2 == 1) {
257 /* FIXME: get bounding box since Evince doesn't support shaped links */
258 int minx = G_MAXINT, miny = G_MAXINT;
259 int maxx = G_MININT, maxy = G_MININT;
261 iter = miniexp_cdr(iter);
262 while (iter != miniexp_nil) {
265 if (!number_from_miniexp (miniexp_car(iter), &x)) goto unknown_link;
266 iter = miniexp_cdr (iter);
267 if (!number_from_miniexp (miniexp_car(iter), &y)) goto unknown_link;
268 iter = miniexp_cdr (iter);
270 minx = MIN (minx, x);
271 miny = MIN (miny, y);
272 maxx = MAX (maxx, x);
273 maxy = MAX (maxy, y);
276 ev_link_mapping->x1 = minx;
277 ev_link_mapping->x2 = maxx;
278 ev_link_mapping->y1 = (page_info->height - maxy);
279 ev_link_mapping->y2 = (page_info->height - miny);
288 g_warning("DjvuLibre error: Unknown hyperlink area %s", miniexp_to_name(miniexp_car(sexp)));
292 static EvLinkMapping *
293 get_djvu_hyperlink_mapping (DjvuDocument *djvu_document,
295 ddjvu_pageinfo_t *page_info,
298 EvLinkMapping *ev_link_mapping = NULL;
299 EvLinkAction *ev_action = NULL;
301 const char *url, *url_target, *comment;
303 ev_link_mapping = g_new (EvLinkMapping, 1);
307 if (miniexp_car (iter) != miniexp_symbol ("maparea")) goto unknown_mapping;
309 iter = miniexp_cdr(iter);
311 if (miniexp_caar(iter) == miniexp_symbol("url")) {
312 if (!string_from_miniexp (miniexp_cadr (miniexp_car (iter)), &url)) goto unknown_mapping;
313 if (!string_from_miniexp (miniexp_caddr (miniexp_car (iter)), &url_target)) goto unknown_mapping;
315 if (!string_from_miniexp (miniexp_car(iter), &url)) goto unknown_mapping;
319 iter = miniexp_cdr (iter);
320 if (!string_from_miniexp (miniexp_car(iter), &comment)) goto unknown_mapping;
322 iter = miniexp_cdr (iter);
323 if (!get_djvu_hyperlink_area (page_info, miniexp_car(iter), ev_link_mapping)) goto unknown_mapping;
325 iter = miniexp_cdr (iter);
326 /* FIXME: DjVu hyperlink attributes are ignored */
328 ev_action = get_djvu_link_action (djvu_document, url, page);
329 if (!ev_action) goto unknown_mapping;
331 ev_link_mapping->link = ev_link_new (comment, ev_action);
333 return ev_link_mapping;
336 if (ev_link_mapping) g_free(ev_link_mapping);
337 g_warning("DjvuLibre error: Unknown hyperlink %s", miniexp_to_name(miniexp_car(sexp)));
343 djvu_links_has_document_links (EvDocumentLinks *document_links)
345 DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
348 while ((outline = ddjvu_document_get_outline (djvu_document->d_document)) == miniexp_dummy)
349 djvu_handle_events (djvu_document, TRUE);
352 ddjvu_miniexp_release (djvu_document->d_document, outline);
360 djvu_links_get_links (EvDocumentLinks *document_links,
364 DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
365 GList *retval = NULL;
366 miniexp_t page_annotations = miniexp_nil;
367 miniexp_t *hyperlinks = NULL, *iter = NULL;
368 EvLinkMapping *ev_link_mapping;
369 ddjvu_pageinfo_t page_info;
371 while ((page_annotations = ddjvu_document_get_pageanno (djvu_document->d_document, page)) == miniexp_dummy)
372 djvu_handle_events (djvu_document, TRUE);
374 while (ddjvu_document_get_pageinfo (djvu_document->d_document, page, &page_info) < DDJVU_JOB_OK)
375 djvu_handle_events(djvu_document, TRUE);
377 if (page_annotations) {
378 hyperlinks = ddjvu_anno_get_hyperlinks (page_annotations);
380 for (iter = hyperlinks; *iter; ++iter) {
381 ev_link_mapping = get_djvu_hyperlink_mapping (djvu_document, page, &page_info, *iter);
382 if (ev_link_mapping) {
383 ev_link_mapping->x1 *= scale_factor;
384 ev_link_mapping->x2 *= scale_factor;
385 ev_link_mapping->y1 *= scale_factor;
386 ev_link_mapping->y2 *= scale_factor;
387 retval = g_list_prepend (retval, ev_link_mapping);
392 ddjvu_miniexp_release (djvu_document->d_document, page_annotations);
399 djvu_links_find_link_dest (EvDocumentLinks *document_links,
400 const gchar *link_name)
402 DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
403 EvLinkDest *ev_dest = NULL;
405 ev_dest = get_djvu_link_dest (DJVU_DOCUMENT (document_links), link_name, -1);
408 g_warning ("DjvuLibre error: unknown link destination %s", link_name);
415 djvu_links_get_links_model (EvDocumentLinks *document_links)
417 DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
418 GtkTreeModel *model = NULL;
419 miniexp_t outline = miniexp_nil;
421 while ((outline = ddjvu_document_get_outline (djvu_document->d_document)) == miniexp_dummy)
422 djvu_handle_events (djvu_document, TRUE);
425 model = (GtkTreeModel *) gtk_tree_store_new (EV_DOCUMENT_LINKS_COLUMN_NUM_COLUMNS,
430 build_tree (djvu_document, model, NULL, outline);
432 ddjvu_miniexp_release (djvu_document->d_document, outline);