libchimara/style.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include "chimara-glk-private.h"
   4 #include "glk.h"
   5 #include "style.h"
   6 #include "magic.h"
   7 #include "stream.h"
   8 #include "strio.h"
   9
  10 extern GPrivate *glk_data_key;
  11
  12 static gboolean style_accept(GScanner *scanner, GTokenType token);
  13 static gboolean style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk);
  14 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  15 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  16 static void style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table);
  17 static void text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list);
  18 GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  19
  20 /**
  21  * glk_set_style:
  22  * @styl: The style to apply
  23  *
  24  * Changes the style of the current output stream. @styl should be one of the
  25  * <code>style_</code> constants. However, any value is actually legal; if the
  26  * interpreter does not recognize the style value, it will treat it as
  27  * %style_Normal.
  28  * <note><para>
  29  *  This policy allows for the future definition of styles without breaking old
  30  *  Glk libraries.
  31  * </para></note>
  32  */
  33 void
  34 glk_set_style(glui32 styl)
  35 {
  36         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  37         g_return_if_fail(glk_data->current_stream != NULL);
  38         glk_set_style_stream(glk_data->current_stream, styl);
  39 }
  40
  41 /* The first 11 tag names must correspond to the first 11 glk tag names as defined below */
  42 static const gchar* TAG_NAMES[] = {
  43         "normal",
  44         "emphasized",
  45         "preformatted",
  46         "header",
  47         "subheader",
  48         "alert",
  49         "note",
  50         "block-quote",
  51         "input",
  52         "user1",
  53         "user2",
  54         "hyperlink",
  55         "pager",
  56         "default"
  57 };
  58
  59 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
  60 static const gchar* GLK_TAG_NAMES[] = {
  61         "glk-normal",
  62         "glk-emphasized",
  63         "glk-preformatted",
  64         "glk-header",
  65         "glk-subheader",
  66         "glk-alert",
  67         "glk-note",
  68         "glk-block-quote",
  69         "glk-input",
  70         "glk-user1",
  71         "glk-user2"
  72 };
  73
  74 const gchar**
  75 style_get_tag_names()
  76 {
  77         return TAG_NAMES;
  78 }
  79
  80 /* Internal function: mapping from style enum to tag name */
  81 static const gchar*
  82 get_tag_name(glui32 style)
  83 {
  84         if(style >= CHIMARA_NUM_STYLES) {
  85                 WARNING("Unsupported style");
  86                 return "normal";
  87         } else {
  88                 return (gchar*) TAG_NAMES[style];
  89         }
  90 }
  91
  92 /* Internal function: mapping from glk style enum to tag name */
  93 static const gchar*
  94 get_glk_tag_name(glui32 style)
  95 {
  96         if(style >= style_NUMSTYLES) {
  97                 WARNING("Unsupported style");
  98                 return "normal";
  99         } else {
 100                 return (gchar*) GLK_TAG_NAMES[style];
 101         }
 102 }
 103
 104 /**
 105  * glk_set_style_stream:
 106  * @str: Output stream to change the style of
 107  * @styl: The style to apply
 108  *
 109  * This changes the style of the stream @str. See glk_set_style().
 110  */
 111 void
 112 glk_set_style_stream(strid_t str, glui32 styl) {
 113         if(str->window == NULL)
 114                 return;
 115
 116         flush_window_buffer(str->window);
 117         str->style = (gchar*) get_tag_name(styl);
 118         str->glk_style = (gchar*) get_glk_tag_name(styl);
 119 }
 120
 121 /* Internal function: call this to initialize the layout of the 'more' prompt. */
 122 void
 123 style_init_more_prompt(winid_t win)
 124 {
 125         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 126
 127         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
 128         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
 129 }
 130
 131 /* Internal function: call this to initialize the default styles to a textbuffer. */
 132 void
 133 style_init_textbuffer(GtkTextBuffer *buffer)
 134 {
 135         g_return_if_fail(buffer != NULL);
 136
 137         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 138
 139         /* Place the default text tags in the textbuffer's tag table */
 140         g_hash_table_foreach(glk_data->styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 141
 142         /* Copy the override text tags to the textbuffers's tag table */
 143         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 144 }
 145
 146
 147 /* Internal function: call this to initialize the default styles to a textgrid. */
 148 void
 149 style_init_textgrid(GtkTextBuffer *buffer)
 150 {
 151         g_return_if_fail(buffer != NULL);
 152
 153         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 154
 155         /* Place the default text tags in the textbuffer's tag table */
 156         g_hash_table_foreach(glk_data->styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 157
 158         /* Copy the current text tags to the textbuffers's tag table */
 159         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 160 }
 161
 162 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 163 static void
 164 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 165 {
 166         g_return_if_fail(key != NULL);
 167         g_return_if_fail(tag != NULL);
 168         g_return_if_fail(tag_table != NULL);
 169
 170         gtk_text_tag_table_add(tag_table, tag);
 171 }
 172
 173 /* Internal function used to iterate over a style table, copying it */
 174 static void
 175 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 176 {
 177         g_return_if_fail(key != NULL);
 178         g_return_if_fail(tag != NULL);
 179         g_return_if_fail(target_table != NULL);
 180
 181         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 182 }
 183
 184 /* Internal function that copies a text tag */
 185 GtkTextTag *
 186 gtk_text_tag_copy(GtkTextTag *tag)
 187 {
 188         GtkTextTag *copy;
 189
 190         g_return_val_if_fail(tag != NULL, NULL);
 191
 192         copy = gtk_text_tag_new(tag->name);
 193         gtk_text_attributes_copy_values(tag->values, copy->values);
 194
 195         #define _COPY_FLAG(flag) copy->flag = tag->flag
 196                 _COPY_FLAG (bg_color_set);
 197                 _COPY_FLAG (bg_color_set);
 198                 _COPY_FLAG (bg_stipple_set);
 199                 _COPY_FLAG (fg_color_set);
 200                 _COPY_FLAG (fg_stipple_set);
 201                 _COPY_FLAG (justification_set);
 202                 _COPY_FLAG (left_margin_set);
 203                 _COPY_FLAG (indent_set);
 204                 _COPY_FLAG (rise_set);
 205                 _COPY_FLAG (strikethrough_set);
 206                 _COPY_FLAG (right_margin_set);
 207                 _COPY_FLAG (pixels_above_lines_set);
 208                 _COPY_FLAG (pixels_below_lines_set);
 209                 _COPY_FLAG (pixels_inside_wrap_set);
 210                 _COPY_FLAG (tabs_set);
 211                 _COPY_FLAG (underline_set);
 212                 _COPY_FLAG (wrap_mode_set);
 213                 _COPY_FLAG (bg_full_height_set);
 214                 _COPY_FLAG (invisible_set);
 215                 _COPY_FLAG (editable_set);
 216                 _COPY_FLAG (language_set);
 217         #undef _COPY_FLAG
 218
 219         /* Copy the data that was added manually */
 220         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse_color" );
 221
 222         if(reverse_color)
 223                 g_object_set_data( G_OBJECT(copy), "reverse_color", reverse_color );
 224
 225         return copy;
 226 }
 227
 228 /* Internal function that constructs the default styles */
 229 void
 230 style_init(ChimaraGlk *glk)
 231 {
 232         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 233
 234         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 235         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 236         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 237         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 238         GtkTextTag *tag;
 239
 240         PangoFontDescription *default_font_desc = pango_font_description_from_string("Serif");
 241         PangoFontDescription *monospace_font_desc = pango_font_description_from_string("Monospace");
 242
 243         /* Initialise the default styles for a text grid */
 244         tag = gtk_text_tag_new("default");
 245         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 246         g_hash_table_insert(default_text_grid_styles, "default", tag);
 247
 248         tag = gtk_text_tag_new("normal");
 249         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 250         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 251
 252         tag = gtk_text_tag_new("emphasized");
 253         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 254         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 255         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 256
 257         tag = gtk_text_tag_new("preformatted");
 258         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 259         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 260
 261         tag = gtk_text_tag_new("header");
 262         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 263         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 264         g_hash_table_insert(default_text_grid_styles, "header", tag);
 265
 266         tag = gtk_text_tag_new("subheader");
 267         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 268         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 269         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 270
 271         tag = gtk_text_tag_new("alert");
 272         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 273         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 274         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 275
 276         tag = gtk_text_tag_new("note");
 277         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 278         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 279         g_hash_table_insert(default_text_grid_styles, "note", tag);
 280
 281         tag = gtk_text_tag_new("block-quote");
 282         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 283         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 284         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 285
 286         tag = gtk_text_tag_new("input");
 287         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 288         g_hash_table_insert(default_text_grid_styles, "input", tag);
 289
 290         tag = gtk_text_tag_new("user1");
 291         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 292         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 293
 294         tag = gtk_text_tag_new("user2");
 295         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 296         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 297
 298         tag = gtk_text_tag_new("hyperlink");
 299         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 300         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 301
 302         /* Initialise the default styles for a text buffer */
 303         tag = gtk_text_tag_new("default");
 304         g_object_set(tag, "font-desc", default_font_desc, NULL);
 305         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 306
 307         tag = gtk_text_tag_new("normal");
 308         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 309         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 310
 311         tag = gtk_text_tag_new("emphasized");
 312         //g_object_set(tag, "font-desc", default_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 313         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 314         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 315
 316         tag = gtk_text_tag_new("preformatted");
 317         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 318         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 319
 320         tag = gtk_text_tag_new("header");
 321         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 322         g_object_set(tag, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 323         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 324
 325         tag = gtk_text_tag_new("subheader");
 326         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 327         g_object_set(tag, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 328         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 329
 330         tag = gtk_text_tag_new("alert");
 331         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 332         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 333         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 334
 335         tag = gtk_text_tag_new("note");
 336         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 337         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 338         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 339
 340         tag = gtk_text_tag_new("block-quote");
 341         //g_object_set(tag, "font-desc", default_font_desc, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 342         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 343         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 344
 345         tag = gtk_text_tag_new("input");
 346         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 347         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 348
 349         tag = gtk_text_tag_new("user1");
 350         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 351         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 352
 353         tag = gtk_text_tag_new("user2");
 354         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 355         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 356
 357         tag = gtk_text_tag_new("hyperlink");
 358         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 359         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 360         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 361
 362         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 363         g_object_set(pager_tag, "font-desc", default_font_desc, "foreground", "#ffffff", "background", "#000000", NULL);
 364         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 365         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 366
 367         pango_font_description_free(default_font_desc);
 368         pango_font_description_free(monospace_font_desc);
 369
 370         priv->styles->text_grid = default_text_grid_styles;
 371         priv->styles->text_buffer = default_text_buffer_styles;
 372
 373
 374         /* Initialize the GLK styles to empty tags */
 375         int i;
 376         for(i=0; i<style_NUMSTYLES; i++) {
 377                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 378                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 379                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 380         }
 381
 382         priv->glk_styles->text_grid = glk_text_grid_styles;
 383         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 384
 385 }
 386
 387 /* Reset style tables to the library's internal defaults */
 388 void
 389 reset_default_styles(ChimaraGlk *glk)
 390 {
 391         /* TODO: write this function */
 392 }
 393
 394 /* Copy the default styles to the current styles
 395  FIXME: This function is temporary and will not be needed later on */
 396 void
 397 copy_default_styles_to_current_styles(ChimaraGlk *glk)
 398 {
 399         /*
 400         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 401         g_hash_table_foreach(priv->styles->text_grid, style_table_copy, priv->glk_styles->text_grid);
 402         g_hash_table_foreach(priv->styles->text_buffer, style_table_copy, priv->glk_styles->text_buffer);
 403
 404         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 405         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 406         */
 407 }
 408
 409 /* Create the CSS file scanner */
 410 GScanner *
 411 create_css_file_scanner(void)
 412 {
 413         GScanner *scanner = g_scanner_new(NULL);
 414         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 415         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 416         scanner->config->symbol_2_token = TRUE;
 417         scanner->config->cpair_comment_single = NULL;
 418         scanner->config->scan_float = FALSE;
 419         return scanner;
 420 }
 421
 422 /* Run the scanner over the CSS file, overriding the default styles */
 423 void
 424 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 425 {
 426         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 427
 428         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 429                 if( !style_accept_style_selector(scanner, glk) )
 430                         break;
 431         }
 432
 433         g_scanner_destroy(scanner);
 434
 435         /* Update the pager prompt to the new style */
 436         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 437         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 438 }
 439
 440 /* Internal function: parses a token */
 441 static gboolean
 442 style_accept(GScanner *scanner, GTokenType token)
 443 {
 444         GTokenType next = g_scanner_get_next_token(scanner);
 445         if(next != token) {
 446                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 447                 return FALSE;
 448         }
 449         return TRUE;
 450 }
 451
 452 /* Internal function: parses a style selector */
 453 static gboolean
 454 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 455 {
 456         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 457
 458         GtkTextTag *current_tag;
 459         gchar *field;
 460         GTokenType token = g_scanner_get_next_token(scanner);
 461         GTokenValue value = g_scanner_cur_value(scanner);
 462
 463         if(
 464                 token != G_TOKEN_IDENTIFIER ||
 465                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 466         ) {
 467                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 468                 return FALSE;
 469         }
 470
 471         field = g_strdup(value.v_identifier);
 472
 473         /* Parse the tag name to change */
 474         if( g_scanner_peek_next_token(scanner) == '{') {
 475                 style_accept(scanner, '{');
 476                 if( !strcmp(field, "buffer") )
 477                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 478                 else
 479                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 480         } else {
 481                 if( !style_accept(scanner, '.') )
 482                         return FALSE;
 483
 484                 token = g_scanner_get_next_token(scanner);
 485                 value = g_scanner_cur_value(scanner);
 486
 487                 if(token != G_TOKEN_IDENTIFIER) {
 488                         g_scanner_error(scanner, "CSS Error: style selector expected");
 489                         return FALSE;
 490                 }
 491
 492                 if( !strcmp(field, "buffer") )
 493                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 494                 else
 495                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 496
 497                 if(current_tag == NULL) {
 498                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 499                         return FALSE;
 500                 }
 501
 502                 if( !style_accept(scanner, '{') )
 503                         return FALSE;
 504         }
 505
 506         while( g_scanner_peek_next_token(scanner) != '}') {
 507                 if( !style_accept_style_hint(scanner, current_tag) )
 508                         return FALSE;
 509         }
 510
 511         if( !style_accept(scanner, '}') )
 512                 return FALSE;
 513
 514         return TRUE;
 515 }
 516
 517 /* Internal function: parses a style hint */
 518 static gboolean
 519 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 520 {
 521         GTokenType token = g_scanner_get_next_token(scanner);
 522         GTokenValue value = g_scanner_cur_value(scanner);
 523         gchar *hint;
 524
 525         if(token != G_TOKEN_IDENTIFIER) {
 526                 g_scanner_error(scanner, "CSS Error: style hint expected");
 527                 return FALSE;
 528         }
 529
 530         hint = g_strdup(value.v_identifier);
 531
 532         if( !style_accept(scanner, ':') )
 533                 return FALSE;
 534
 535         token = g_scanner_get_next_token(scanner);
 536         value = g_scanner_cur_value(scanner);
 537
 538         if( !strcmp(hint, "font-family") ) {
 539                 if(token != G_TOKEN_STRING) {
 540                         g_scanner_error(scanner, "CSS Error: string expected");
 541                         return FALSE;
 542                 }
 543                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 544         }
 545         else if( !strcmp(hint, "font-weight") ) {
 546                 if(token != G_TOKEN_IDENTIFIER) {
 547                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 548                         return FALSE;
 549                 }
 550
 551                 if( !strcmp(value.v_identifier, "bold") )
 552                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 553                 else if( !strcmp(value.v_identifier, "normal") )
 554                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 555                 else {
 556                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 557                         return FALSE;
 558                 }
 559         }
 560         else if( !strcmp(hint, "font-style") ) {
 561                 if(token != G_TOKEN_IDENTIFIER) {
 562                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 563                         return FALSE;
 564                 }
 565
 566                 if( !strcmp(value.v_identifier, "italic") )
 567                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 568                 else if( !strcmp(value.v_identifier, "normal") )
 569                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 570                 else {
 571                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 572                         return FALSE;
 573                 }
 574         }
 575         else if( !strcmp(hint, "font-size") ) {
 576                 if(token == G_TOKEN_INT)
 577                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 578                 else if(token == G_TOKEN_FLOAT)
 579                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 580                 else {
 581                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 582                         return FALSE;
 583                 }
 584         }
 585         else if( !strcmp(hint, "color") ) {
 586                 if(token != G_TOKEN_IDENTIFIER) {
 587                         g_scanner_error(scanner, "CSS Error: hex color expected");
 588                         return FALSE;
 589                 }
 590
 591                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 592         }
 593         else if( !strcmp(hint, "background-color") ) {
 594                 if(token != G_TOKEN_IDENTIFIER) {
 595                         g_scanner_error(scanner, "CSS Error: hex color expected");
 596                         return FALSE;
 597                 }
 598                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 599         }
 600         else if( !strcmp(hint, "text-align") ) {
 601                 if(token != G_TOKEN_IDENTIFIER) {
 602                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 603                         return FALSE;
 604                 }
 605
 606                 if( !strcmp(value.v_identifier, "left") )
 607                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 608                 else if( !strcmp(value.v_identifier, "right") )
 609                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 610                 else if( !strcmp(value.v_identifier, "center") )
 611                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 612                 else {
 613                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 614                         return FALSE;
 615                 }
 616         }
 617         else if( !strcmp(hint, "margin-left") ) {
 618                 if(token != G_TOKEN_INT) {
 619                         g_scanner_error(scanner, "CSS Error: integer expected");
 620                         return FALSE;
 621                 }
 622                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 623         }
 624         else if( !strcmp(hint, "margin-right") ) {
 625                 if(token != G_TOKEN_INT) {
 626                         g_scanner_error(scanner, "CSS Error: integer expected");
 627                         return FALSE;
 628                 }
 629                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 630         }
 631         else if( !strcmp(hint, "margin-top") ) {
 632                 if(token != G_TOKEN_INT) {
 633                         g_scanner_error(scanner, "CSS Error: integer expected");
 634                         return FALSE;
 635                 }
 636                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 637         }
 638         else if( !strcmp(hint, "margin-bottom") ) {
 639                 if(token != G_TOKEN_INT) {
 640                         g_scanner_error(scanner, "CSS Error: integer expected");
 641                         return FALSE;
 642                 }
 643                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 644         }
 645
 646         else {
 647                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 648                 return FALSE;
 649         }
 650
 651         if( !style_accept(scanner, ';') )
 652                 return FALSE;
 653
 654         return TRUE;
 655 }
 656
 657 /* Internal function: parses a glk color to a #hex-value */
 658 static void
 659 glkcolor_to_hex(glui32 val, gchar *buffer)
 660 {
 661         g_return_if_fail(buffer != NULL);
 662
 663         sprintf(buffer, "#%02X%02X%02X",
 664                 ((val & 0xff0000) >> 16),
 665                 ((val & 0x00ff00) >> 8),
 666                 (val & 0x0000ff)
 667         );
 668 }
 669
 670 /* Internal function: parses a glk color to a GdkColor */
 671 void
 672 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 673 {
 674         color->red = 256 * ((val & 0xff0000) >> 16);
 675         color->green = 256 * ((val & 0x00ff00) >> 8);
 676         color->blue = 256 * (val & 0x0000ff);
 677 }
 678
 679 /* Internal function: parses a GdkColor to a glk color */
 680 static glui32
 681 gdkcolor_to_glkcolor(GdkColor *color)
 682 {
 683         g_return_val_if_fail(color != NULL, 0);
 684         return (glui32) color->pixel;
 685 }
 686
 687 /* Internal function: changes a GTK tag to correspond with the given style. */
 688 static void
 689 apply_stylehint_to_tag(GtkTextTag *tag, GtkTextTag *default_tag, glui32 wintype, glui32 hint, glsi32 val)
 690 {
 691         g_return_if_fail(tag != NULL);
 692
 693         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 694         GObject *tag_object = G_OBJECT(tag);
 695
 696         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 697
 698         int i = 0;
 699         gchar color[20];
 700         switch(hint) {
 701         case stylehint_Indentation:
 702                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 703                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 704                 break;
 705
 706         case stylehint_ParaIndentation:
 707                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 708                 break;
 709
 710         case stylehint_Justification:
 711                 switch(val) {
 712                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 713                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 714                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 715                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 716                         default:
 717                                 WARNING("Unknown justification");
 718                                 i = GTK_JUSTIFY_LEFT;
 719                 }
 720                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 721                 break;
 722
 723         case stylehint_Weight:
 724                 switch(val) {
 725                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 726                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 727                         case  1: i = PANGO_WEIGHT_BOLD; break;
 728                         default: WARNING("Unknown font weight");
 729                 }
 730                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 731                 break;
 732
 733         case stylehint_Size:
 734                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 735                 break;
 736
 737         case stylehint_Oblique:
 738                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 739                 break;
 740
 741         case stylehint_Proportional:
 742         {
 743                 gchar *font_family;
 744                 GtkTextTag *font_tag = g_hash_table_lookup(
 745                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 746                     val? "normal" : "preformatted");
 747                 g_object_get(font_tag, "family", &font_family, NULL);
 748                 g_object_set(tag_object, "family", font_family, "family-set", TRUE, NULL);
 749                 g_free(font_family);
 750         }
 751                 break;
 752
 753         case stylehint_TextColor:
 754                 glkcolor_to_hex(val, color);
 755
 756                 if(!reverse_color)
 757                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 758                 else
 759                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 760
 761                 break;
 762
 763         case stylehint_BackColor:
 764                 glkcolor_to_hex(val, color);
 765
 766                 if(!reverse_color)
 767                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 768                 else
 769                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 770
 771                 break;
 772
 773         case stylehint_ReverseColor:
 774                 if(reverse_color != val) {
 775                         /* Flip the fore- and background colors */
 776                         GdkColor* foreground_color;
 777                         GdkColor* background_color;
 778                         gint f_set, b_set, df_set, db_set = 0;
 779                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 780                         g_object_get(default_tag, "foreground-set", &df_set, "background-set", &db_set, NULL);
 781
 782                         if(f_set)
 783                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 784                         else if(df_set)
 785                                 g_object_get(default_tag, "foreground-gdk", &foreground_color, NULL);
 786                         if(b_set)
 787                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 788                         else if(db_set)
 789                                 g_object_get(default_tag, "background-gdk", &background_color, NULL);
 790
 791                         if(b_set || db_set)
 792                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 793                         else
 794                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 795
 796                         if(f_set || df_set)
 797                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 798                         else
 799                                 g_object_set(tag_object, "background", "#000000", NULL);
 800
 801                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 802                 }
 803                 break;
 804
 805         default:
 806                 WARNING("Unknown style hint");
 807         }
 808 }
 809
 810 /* Internal function: queries a text tag for the value of a given style hint */
 811 static gint
 812 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 813 {
 814         gint intval;
 815         GdkColor *colval;
 816
 817         g_return_val_if_fail(tag != NULL, 0);
 818
 819         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 820
 821         switch(hint) {
 822         case stylehint_Indentation:
 823                 g_object_get(tag, "left_margin", &intval, NULL);
 824                 return intval/5;
 825
 826         case stylehint_ParaIndentation:
 827                 g_object_get(tag, "indent", &intval, NULL);
 828                 return intval/5;
 829
 830         case stylehint_Justification:
 831                 g_object_get(tag, "justification", &intval, NULL);
 832                 switch(intval) {
 833                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 834                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 835                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 836                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 837                         default:
 838                                 WARNING("Unknown justification");
 839                                 return stylehint_just_LeftFlush;
 840                 }
 841
 842         case stylehint_Weight:
 843                 g_object_get(tag, "weight", &intval, NULL);
 844                 switch(intval) {
 845                         case PANGO_WEIGHT_LIGHT: return -1;
 846                         case PANGO_WEIGHT_NORMAL: return 0;
 847                         case PANGO_WEIGHT_BOLD: return 1;
 848                         default: WARNING("Unknown font weight"); return 0;
 849                 }
 850
 851         case stylehint_Size:
 852                 g_object_get(tag, "size", &intval, NULL);
 853                 return (intval/2)-14;
 854
 855         case stylehint_Oblique:
 856                 g_object_get(tag, "style", &intval , NULL);
 857                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 858
 859         case stylehint_Proportional:
 860                 /* Use pango_font_family_is_monospace()? */
 861         {
 862                 gchar *font_family, *query_font_family;
 863                 GtkTextTag *font_tag = g_hash_table_lookup(
 864                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 865                     "preformatted");
 866                 g_object_get(font_tag, "family", &font_family, NULL);
 867                 g_object_get(tag, "family", &query_font_family, NULL);
 868                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 869                 g_free(font_family);
 870                 g_free(query_font_family);
 871                 return retval;
 872         }
 873
 874         case stylehint_TextColor:
 875                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 876                 return gdkcolor_to_glkcolor(colval);
 877
 878         case stylehint_BackColor:
 879                 g_object_get(tag, "background-gdk", &colval, NULL);
 880                 return gdkcolor_to_glkcolor(colval);
 881
 882         case stylehint_ReverseColor:
 883                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 884
 885         default:
 886                 WARNING("Unknown style hint");
 887         }
 888
 889         return 0;
 890 }
 891
 892 /**
 893  * glk_stylehint_set:
 894  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 895  * @styl: The style to set a hint for.
 896  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 897  * @val: The style hint. The meaning of this depends on @hint.
 898  *
 899  * Sets a hint about the appearance of one style for a particular type of
 900  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 901  * all types of window.
 902  * <note><para>
 903  *  There is no equivalent constant to set a hint for all styles of a single
 904  *  window type.
 905  * </para></note>
 906  */
 907 void
 908 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 909 {
 910         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 911
 912         GtkTextTag *to_change, *default_tag;
 913         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 914                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 915                 default_tag = g_hash_table_lookup( glk_data->styles->text_buffer, get_tag_name(styl) );
 916                 apply_stylehint_to_tag(to_change, default_tag, wintype_TextBuffer, hint, val);
 917         }
 918
 919         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 920                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 921                 default_tag = g_hash_table_lookup( glk_data->styles->text_grid, get_tag_name(styl) );
 922                 apply_stylehint_to_tag(to_change, default_tag, wintype_TextGrid, hint, val);
 923         }
 924 }
 925
 926 /**
 927  * glk_stylehint_clear:
 928  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 929  * @styl: The style to set a hint for.
 930  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 931  *
 932  * Clears a hint about the appearance of one style for a particular type of
 933  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 934  * which clears a hint for all types of window.
 935  * <note><para>
 936  *  There is no equivalent constant to reset a hint for all styles of a single
 937  *  window type.
 938  * </para></note>
 939  */
 940 void
 941 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 942 {
 943         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 944         GtkTextTag *tag;
 945
 946         switch(wintype) {
 947         case wintype_TextBuffer:
 948                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 949                 if(tag) {
 950                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 951                 }
 952                 break;
 953         case wintype_TextGrid:
 954                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 955                 if(tag) {
 956                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 957                 }
 958         default:
 959                 return;
 960         }
 961 }
 962
 963 /**
 964  * glk_style_distinguish:
 965  * @win: The window in which the styles are to be distinguished.
 966  * @styl1: The first style to be distinguished from the second style.
 967  * @styl2: The second style to be distinguished from the first style.
 968  *
 969  * Decides whether two styles are visually distinguishable in the given window.
 970  * The exact meaning of this is left for the library to determine.
 971  * <note><title>Chimara</title><para>
 972  *   Currently, all styles of one window are assumed to be mutually
 973  *   distinguishable.
 974  * </para></note>
 975  *
 976  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 977  * are not, it returns %FALSE (0).
 978  */
 979 glui32
 980 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 981 {
 982         /* FIXME */
 983         return styl1 != styl2;
 984 }
 985
 986 /**
 987  * glk_style_measure:
 988  * @win: The window from which to take the style.
 989  * @styl: The style to perform the measurement on.
 990  * @hint: The stylehint to measure.
 991  * @result: Address to write the result to.
 992  *
 993  * Tries to test an attribute of one style in the given window @win. The library
 994  * may not be able to determine the attribute; if not, this returns %FALSE (0).
 995  * If it can, it returns %TRUE (1) and stores the value in the location pointed
 996  * at by @result.
 997  * <note><para>
 998  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
 999  * </para></note>
1000  *
1001  * The meaning of the value depends on the hint which was tested:
1002  * <variablelist>
1003  * <varlistentry>
1004  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1005  *   <listitem><para>The indentation and paragraph indentation. These are in a
1006  *   metric which is platform-dependent.</para>
1007  *   <note><para>Most likely either characters or pixels.</para></note>
1008  *   </listitem>
1009  * </varlistentry>
1010  * <varlistentry>
1011  *   <term>%stylehint_Justification</term>
1012  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1013  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1014  *   %stylehint_just_RightFlush.</para></listitem>
1015  * </varlistentry>
1016  * <varlistentry>
1017  *   <term>%stylehint_Size</term>
1018  *   <listitem><para>The font size. Again, this is in a platform-dependent
1019  *   metric.</para>
1020  *   <note><para>Pixels, points, or simply 1 if the library does not support
1021  *   varying font sizes.</para></note>
1022  *   </listitem>
1023  * </varlistentry>
1024  * <varlistentry>
1025  *   <term>%stylehint_Weight</term>
1026  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1027  *   and -1 for light-weight fonts.</para></listitem>
1028  * </varlistentry>
1029  * <varlistentry>
1030  *   <term>%stylehint_Oblique</term>
1031  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1032  *   </listitem>
1033  * </varlistentry>
1034  * <varlistentry>
1035  *   <term>%stylehint_Proportional</term>
1036  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1037  *   </para></listitem>
1038  * </varlistentry>
1039  * <varlistentry>
1040  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1041  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1042  *   described in <link
1043  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1044  *   Appearance of Styles</link>.</para></listitem>
1045  * </varlistentry>
1046  * <varlistentry>
1047  *   <term>%stylehint_ReverseColor</term>
1048  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1049  *   colors are reversed.</para></listitem>
1050  * </varlistentry>
1051  * </variablelist>
1052  *
1053  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1054  */
1055 glui32
1056 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1057 {
1058         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1059         GtkTextTag *tag;
1060
1061         switch(win->type) {
1062         case wintype_TextBuffer:
1063                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1064                 if(result)
1065                         *result = query_tag(tag, win->type, hint);
1066                 break;
1067         case wintype_TextGrid:
1068                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1069                 if(result)
1070                         *result = query_tag(tag, win->type, hint);
1071         default:
1072                 return FALSE;
1073         }
1074
1075         return TRUE;
1076 }
1077
1078 /* Internal function returning the current default font for a window type
1079  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1080  * supported for now */
1081 PangoFontDescription *
1082 get_current_font(guint32 wintype)
1083 {
1084         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1085         GtkTextTag *normal;
1086
1087         switch(wintype) {
1088         case wintype_TextGrid:
1089                 normal = g_hash_table_lookup(glk_data->styles->text_grid, "normal");
1090                 break;
1091         case wintype_TextBuffer:
1092                 normal = g_hash_table_lookup(glk_data->styles->text_buffer, "normal");
1093                 break;
1094         default:
1095                 return NULL;
1096         }
1097
1098         PangoFontDescription *font;
1099         g_object_get( G_OBJECT(normal), "font-desc", &font, NULL );
1100
1101         return font;
1102 }
1103
1104 /* Internal function copying the attributes of a text tag to a pango attribute list */
1105 static void
1106 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1107 {
1108         gboolean set;
1109         GdkColor *foreground, *background;
1110         gchar *string;
1111         PangoFontDescription *font_desc;
1112         gboolean strikethrough;
1113         PangoUnderline underline;
1114
1115         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1116         if(set) {
1117                 pango_attr_list_insert(
1118                         list,
1119                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1120                 );
1121         }
1122         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1123         if(set) {
1124                 pango_attr_list_insert(
1125                         list,
1126                         pango_attr_background_new(background->red, background->green, background->blue)
1127                 );
1128         }
1129         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1130         if(set) {
1131                 pango_attr_list_insert(
1132                         list,
1133                         pango_attr_language_new( pango_language_from_string(string) )
1134                 );
1135         }
1136
1137         /* Font description updates the following properties simultaniously:
1138          * family, style, weight, variant, stretch, size
1139          */
1140         g_object_get(tag, "font-desc", &font_desc, NULL);
1141         pango_attr_list_insert(
1142                 list,
1143                 pango_attr_font_desc_new(font_desc)
1144         );
1145
1146         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1147         if(set) {
1148                 pango_attr_list_insert(
1149                         list,
1150                         pango_attr_strikethrough_new(strikethrough)
1151                 );
1152         }
1153         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1154         if(set) {
1155                 pango_attr_list_insert(
1156                         list,
1157                         pango_attr_underline_new(underline)
1158                 );
1159         }
1160 }
1161
1162 /* Update pager and reverse video tags */
1163 void
1164 style_update(ChimaraGlk *glk)
1165 {
1166         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1167
1168         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1169         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1170 }