/******************************************************************** * gnc-html-history.c -- keep a HTML history * * Copyright (C) 2000 Bill Gribble * * * * This program is free software; you can redistribute it and/or * * modify it under the terms of the GNU General Public License as * * published by the Free Software Foundation; either version 2 of * * the License, or (at your option) any later version. * * * * This program is distributed in the hope that it will be useful, * * but WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * * GNU General Public License for more details. * * * * You should have received a copy of the GNU General Public License* * along with this program; if not, contact: * * * * Free Software Foundation Voice: +1-617-542-5942 * * 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652 * * Boston, MA 02110-1301, USA gnu@gnu.org * ********************************************************************/ #include #include #include #include "gnc-html-history.h" struct _gnc_html_history { GList * nodes; GList * current_node; GList * last_node; /* call this whenever a node is destroyed */ gnc_html_history_destroy_cb destroy_cb; gpointer destroy_cb_data; }; /******************************************************************** * gnc_html_history_new ********************************************************************/ gnc_html_history * gnc_html_history_new(void) { gnc_html_history * hist = g_new0(gnc_html_history, 1); hist->nodes = NULL; hist->current_node = NULL; hist->last_node = NULL; return hist; } /******************************************************************** * gnc_html_history_destroy ********************************************************************/ void gnc_html_history_destroy(gnc_html_history * hist) { GList * n; for (n = hist->nodes; n ; n = n->next) { if (hist->destroy_cb) { (hist->destroy_cb)((gnc_html_history_node *)n->data, hist->destroy_cb_data); } gnc_html_history_node_destroy((gnc_html_history_node *)n->data); } g_list_free(hist->nodes); hist->nodes = NULL; hist->current_node = NULL; hist->last_node = NULL; g_free(hist); } /******************************************************************** * gnc_html_history_set_node_destroy_cb ********************************************************************/ void gnc_html_history_set_node_destroy_cb(gnc_html_history * hist, gnc_html_history_destroy_cb cb, gpointer cb_data) { hist->destroy_cb = cb; hist->destroy_cb_data = cb_data; } static int g_strcmp(char * a, char * b) { if (!a && b) { return 1; } else if (a && !b) { return -1; } else if (!a && !b) { return 0; } else { return strcmp(a, b); } } /******************************************************************** * gnc_html_history_append ********************************************************************/ void gnc_html_history_append(gnc_html_history * hist, gnc_html_history_node * node) { GList * n; gnc_html_history_node * hn; if (hist->current_node) { hn = hist->current_node->data; if ((hn->type == node->type) && !g_strcmp(hn->location, node->location) && !g_strcmp(hn->label, node->label)) { if (hist->destroy_cb) { (hist->destroy_cb)(hn, hist->destroy_cb_data); } gnc_html_history_node_destroy(node); return; } /* blow away the history after this point, if there is one */ for (n = hist->current_node->next; n; n = n->next) { if (hist->destroy_cb) { (hist->destroy_cb)((gnc_html_history_node *)n->data, hist->destroy_cb_data); } gnc_html_history_node_destroy((gnc_html_history_node *)n->data); } g_list_free(hist->current_node->next); hist->current_node->next = NULL; hist->last_node = hist->current_node; } n = g_list_alloc(); n->data = (gpointer) node; n->next = NULL; n->prev = NULL; if (hist->nodes && hist->last_node) { n->prev = hist->last_node; /* back pointer */ hist->last_node->next = n; /* add n to the list */ hist->last_node = n; /* n is last */ hist->current_node = n; } else { /* this is the first entry in the list */ if (hist->nodes) { g_print ("???? hist->nodes non-NULL, but no last_node!\n"); } hist->nodes = n; hist->last_node = n; hist->current_node = n; } } /******************************************************************** * gnc_html_history_get_current ********************************************************************/ gnc_html_history_node * gnc_html_history_get_current(gnc_html_history * hist) { if (!hist || !(hist->current_node)) return NULL; return hist->current_node->data; } /******************************************************************** * gnc_html_history_forward ********************************************************************/ gnc_html_history_node * gnc_html_history_forward(gnc_html_history * hist) { if (!hist || !(hist->current_node)) { return NULL; } if (hist->current_node->next) { hist->current_node = hist->current_node->next; } return hist->current_node->data; } /******************************************************************** * gnc_html_history_back ********************************************************************/ gnc_html_history_node * gnc_html_history_back(gnc_html_history * hist) { if (!hist || !(hist->current_node)) { return NULL; } if (hist->current_node->prev) { hist->current_node = hist->current_node->prev; } return hist->current_node->data; } /******************************************************************** * gnc_html_history_back_p * is it possible to go back? ********************************************************************/ int gnc_html_history_back_p(gnc_html_history * hist) { if (hist && hist->current_node && hist->current_node->prev) { return TRUE; } else { return FALSE; } } /******************************************************************** * gnc_html_history_forward_p * is it possible to go forward? ********************************************************************/ int gnc_html_history_forward_p(gnc_html_history * hist) { if (hist && hist->current_node && hist->current_node->next) { return TRUE; } else { return FALSE; } } /******************************************************************** * gnc_html_history_node_new ********************************************************************/ gnc_html_history_node * gnc_html_history_node_new(URLType type, const gchar * location, const gchar * label) { gnc_html_history_node * rv = g_new0(gnc_html_history_node, 1); rv->type = g_strdup(type); rv->location = g_strdup(location); rv->label = g_strdup(label); return rv; } /******************************************************************** * gnc_html_history_node_destroy ********************************************************************/ void gnc_html_history_node_destroy(gnc_html_history_node * node) { /* free the url resources and cached text */ g_free(node->type); g_free(node->location); g_free(node->label); node->location = NULL; node->label = NULL; g_free(node); }