mdw@git.distorted.org.uk Git - disorder/blob - disobedience/help.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2007 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include "disobedience.h"
  22 #include "table.h"
  23 #include "html.h"
  24 #include "manual.h"
  25
  26 VECTOR_TYPE(markstack, GtkTextMark *, xrealloc);
  27
  28 /** @brief Known tag type */
  29 struct tag {
  30   /** @brief HTML tag name */
  31   const char *name;
  32
  33   /** @brief Called to set up the tag */
  34   void (*init)(GtkTextTag *tag);
  35
  36   /** @brief GTK+ tag object */
  37   GtkTextTag *tag;
  38 };
  39
  40 static void init_bold(GtkTextTag *tag) {
  41   g_object_set(G_OBJECT(tag), "weight", PANGO_WEIGHT_BOLD, (char *)0);
  42 }
  43
  44 static void init_italic(GtkTextTag *tag) {
  45   g_object_set(G_OBJECT(tag), "style", PANGO_STYLE_ITALIC, (char *)0);
  46 }
  47
  48 /** @brief Table of known tags
  49  *
  50  * Keep in alphabetical order
  51  */
  52 static  struct tag tags[] = {
  53   { "b", init_bold, 0 },
  54   { "i", init_italic, 0 }
  55 };
  56
  57 /** @brief Number of known tags */
  58 #define NTAGS (sizeof tags / sizeof *tags)
  59
  60 /** @brief State structure for insert_html() */
  61 struct state {
  62   /** @brief The buffer to insert into */
  63   GtkTextBuffer *buffer;
  64
  65   /** @brief True if we are inside <body> */
  66   int body;
  67
  68   /** @brief Stack of marks corresponding to tags */
  69   struct markstack marks[1];
  70
  71 };
  72
  73 /** @brief Called for an open tag */
  74 static void html_open(const char *tag,
  75                       hash attribute((unused)) *attrs,
  76                       void *u) {
  77   struct state *const s = u;
  78   GtkTextIter iter[1];
  79
  80   if(!strcmp(tag, "body"))
  81     s->body = 1;
  82   if(!s->body)
  83     return;
  84   /* push a mark for the start of the region */
  85   gtk_text_buffer_get_iter_at_mark(s->buffer, iter,
  86                                    gtk_text_buffer_get_insert(s->buffer));
  87   markstack_append(s->marks,
  88                    gtk_text_buffer_create_mark(s->buffer,
  89                                                0/* mark_name */,
  90                                                iter,
  91                                                TRUE/*left_gravity*/));
  92 }
  93
  94 /** @brief Called for a close tag */
  95 static void html_close(const char *tag,
  96                        void *u) {
  97   struct state *const s = u;
  98   GtkTextIter start[1], end[1];
  99   int n;
 100
 101   if(!strcmp(tag, "body"))
 102     s->body = 0;
 103   if(!s->body)
 104     return;
 105   /* see if this is a known tag */
 106   if((n = TABLE_FIND(tags, struct tag, name, tag)) < 0)
 107     return;
 108   /* pop the mark at the start of the region */
 109   assert(s->marks->nvec > 0);
 110   gtk_text_buffer_get_iter_at_mark(s->buffer, start,
 111                                    s->marks->vec[--s->marks->nvec]);
 112   gtk_text_buffer_get_iter_at_mark(s->buffer, end,
 113                                    gtk_text_buffer_get_insert(s->buffer));
 114   /* apply a tag */
 115   gtk_text_buffer_apply_tag(s->buffer, tags[n].tag, start, end);
 116   /* don't need the start mark any more */
 117   gtk_text_buffer_delete_mark(s->buffer, s->marks->vec[s->marks->nvec]);
 118 }
 119
 120 /** @brief Called for text */
 121 static void html_text(const char *text,
 122                       void *u) {
 123   struct state *const s = u;
 124
 125   /* ignore header */
 126   if(!s->body)
 127     return;
 128   gtk_text_buffer_insert_at_cursor(s->buffer, text, strlen(text));
 129 }
 130
 131 /** @brief Callbacks for insert_html() */
 132 static const struct html_parser_callbacks insert_html_callbacks = {
 133   html_open,
 134   html_close,
 135   html_text
 136 };
 137
 138 /** @brief Insert @p html into @p buffer at cursor */
 139 static void insert_html(GtkTextBuffer *buffer,
 140                         const char *html) {
 141   struct state s[1];
 142   size_t n;
 143   GtkTextTagTable *tagtable;
 144
 145   memset(s, 0, sizeof *s);
 146   s->buffer = buffer;
 147   markstack_init(s->marks);
 148   /* initialize tags */
 149   if(!tags[0].tag)
 150     for(n = 0; n < NTAGS; ++n)
 151       tags[n].init(tags[n].tag = gtk_text_tag_new(0));
 152   /* add tags to this buffer */
 153   tagtable = gtk_text_buffer_get_tag_table(s->buffer);
 154   for(n = 0; n < NTAGS; ++n)
 155     gtk_text_tag_table_add(tagtable, tags[n].tag);
 156   /* convert the input */
 157   html_parse(&insert_html_callbacks, html, s);
 158 }
 159
 160 static GtkTextBuffer *html_buffer(const char *html) {
 161   GtkTextBuffer *buffer = gtk_text_buffer_new(NULL);
 162
 163   insert_html(buffer, html);
 164   return buffer;
 165 }
 166
 167 static GtkWidget *help_window;
 168
 169 void popup_help(void) {
 170   GtkWidget *view;
 171
 172   if(help_window) {
 173     gtk_window_present(GTK_WINDOW(help_window));
 174     return;
 175   }
 176   help_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 177   g_signal_connect(help_window, "destroy",
 178                    G_CALLBACK(gtk_widget_destroyed), &help_window);
 179   gtk_window_set_title(GTK_WINDOW(help_window), "Disobedience Manual");
 180   view = gtk_text_view_new_with_buffer(html_buffer(manual));
 181   gtk_container_add(GTK_CONTAINER(help_window),
 182                     scroll_widget(view,
 183                                   "help"));
 184   gtk_widget_show_all(help_window);
 185 }
 186
 187 /*
 188 Local Variables:
 189 c-basic-offset:2
 190 comment-column:40
 191 fill-column:79
 192 indent-tabs-mode:nil
 193 End:
 194 */