libchimara/style.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <math.h>
   4 #include "chimara-glk-private.h"
   5 #include "glk.h"
   6 #include "style.h"
   7 #include "magic.h"
   8 #include "stream.h"
   9 #include "strio.h"
  10
  11 extern GPrivate *glk_data_key;
  12
  13 static gboolean style_accept(GScanner *scanner, GTokenType token);
  14 static gboolean style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk);
  15 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  16 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  17 static void style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table);
  18 static void text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list);
  19 GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  20
  21 /**
  22  * glk_set_style:
  23  * @styl: The style to apply
  24  *
  25  * Changes the style of the current output stream. @styl should be one of the
  26  * <code>style_</code> constants. However, any value is actually legal; if the
  27  * interpreter does not recognize the style value, it will treat it as
  28  * %style_Normal.
  29  * <note><para>
  30  *  This policy allows for the future definition of styles without breaking old
  31  *  Glk libraries.
  32  * </para></note>
  33  */
  34 void
  35 glk_set_style(glui32 styl)
  36 {
  37         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  38         g_return_if_fail(glk_data->current_stream != NULL);
  39         glk_set_style_stream(glk_data->current_stream, styl);
  40 }
  41
  42 /* The first 11 tag names must correspond to the first 11 glk tag names as defined below */
  43 static const gchar* TAG_NAMES[] = {
  44         "normal",
  45         "emphasized",
  46         "preformatted",
  47         "header",
  48         "subheader",
  49         "alert",
  50         "note",
  51         "block-quote",
  52         "input",
  53         "user1",
  54         "user2",
  55         "hyperlink",
  56         "pager",
  57         "default"
  58 };
  59
  60 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
  61 static const gchar* GLK_TAG_NAMES[] = {
  62         "glk-normal",
  63         "glk-emphasized",
  64         "glk-preformatted",
  65         "glk-header",
  66         "glk-subheader",
  67         "glk-alert",
  68         "glk-note",
  69         "glk-block-quote",
  70         "glk-input",
  71         "glk-user1",
  72         "glk-user2"
  73 };
  74
  75 const gchar**
  76 style_get_tag_names()
  77 {
  78         return TAG_NAMES;
  79 }
  80
  81 /* Internal function: mapping from style enum to tag name */
  82 static const gchar*
  83 get_tag_name(glui32 style)
  84 {
  85         if(style >= CHIMARA_NUM_STYLES) {
  86                 WARNING("Unsupported style");
  87                 return "normal";
  88         } else {
  89                 return (gchar*) TAG_NAMES[style];
  90         }
  91 }
  92
  93 /* Internal function: mapping from glk style enum to tag name */
  94 static const gchar*
  95 get_glk_tag_name(glui32 style)
  96 {
  97         if(style >= style_NUMSTYLES) {
  98                 WARNING("Unsupported style");
  99                 return "normal";
 100         } else {
 101                 return (gchar*) GLK_TAG_NAMES[style];
 102         }
 103 }
 104
 105 /**
 106  * glk_set_style_stream:
 107  * @str: Output stream to change the style of
 108  * @styl: The style to apply
 109  *
 110  * This changes the style of the stream @str. See glk_set_style().
 111  */
 112 void
 113 glk_set_style_stream(strid_t str, glui32 styl) {
 114         if(str->window == NULL)
 115                 return;
 116
 117         flush_window_buffer(str->window);
 118         str->style = (gchar*) get_tag_name(styl);
 119         str->glk_style = (gchar*) get_glk_tag_name(styl);
 120 }
 121
 122 /* Internal function: call this to initialize the layout of the 'more' prompt. */
 123 void
 124 style_init_more_prompt(winid_t win)
 125 {
 126         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 127
 128         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
 129         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
 130 }
 131
 132 /* Internal function: call this to initialize the default styles to a textbuffer. */
 133 void
 134 style_init_textbuffer(GtkTextBuffer *buffer)
 135 {
 136         g_return_if_fail(buffer != NULL);
 137
 138         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 139
 140         /* Place the default text tags in the textbuffer's tag table */
 141         g_hash_table_foreach(glk_data->styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 142
 143         /* Copy the override text tags to the textbuffers's tag table */
 144         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 145 }
 146
 147
 148 /* Internal function: call this to initialize the default styles to a textgrid. */
 149 void
 150 style_init_textgrid(GtkTextBuffer *buffer)
 151 {
 152         g_return_if_fail(buffer != NULL);
 153
 154         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 155
 156         /* Place the default text tags in the textbuffer's tag table */
 157         g_hash_table_foreach(glk_data->styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 158
 159         /* Copy the current text tags to the textbuffers's tag table */
 160         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 161 }
 162
 163 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 164 static void
 165 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 166 {
 167         g_return_if_fail(key != NULL);
 168         g_return_if_fail(tag != NULL);
 169         g_return_if_fail(tag_table != NULL);
 170
 171         gtk_text_tag_table_add(tag_table, tag);
 172 }
 173
 174 /* Internal function used to iterate over a style table, copying it */
 175 static void
 176 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 177 {
 178         g_return_if_fail(key != NULL);
 179         g_return_if_fail(tag != NULL);
 180         g_return_if_fail(target_table != NULL);
 181
 182         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 183 }
 184
 185 /* Internal function that copies a text tag */
 186 GtkTextTag *
 187 gtk_text_tag_copy(GtkTextTag *tag)
 188 {
 189         GtkTextTag *copy;
 190
 191         g_return_val_if_fail(tag != NULL, NULL);
 192
 193         copy = gtk_text_tag_new(tag->name);
 194         gtk_text_attributes_copy_values(tag->values, copy->values);
 195
 196         #define _COPY_FLAG(flag) copy->flag = tag->flag
 197                 _COPY_FLAG (bg_color_set);
 198                 _COPY_FLAG (bg_color_set);
 199                 _COPY_FLAG (bg_stipple_set);
 200                 _COPY_FLAG (fg_color_set);
 201                 _COPY_FLAG (fg_stipple_set);
 202                 _COPY_FLAG (justification_set);
 203                 _COPY_FLAG (left_margin_set);
 204                 _COPY_FLAG (indent_set);
 205                 _COPY_FLAG (rise_set);
 206                 _COPY_FLAG (strikethrough_set);
 207                 _COPY_FLAG (right_margin_set);
 208                 _COPY_FLAG (pixels_above_lines_set);
 209                 _COPY_FLAG (pixels_below_lines_set);
 210                 _COPY_FLAG (pixels_inside_wrap_set);
 211                 _COPY_FLAG (tabs_set);
 212                 _COPY_FLAG (underline_set);
 213                 _COPY_FLAG (wrap_mode_set);
 214                 _COPY_FLAG (bg_full_height_set);
 215                 _COPY_FLAG (invisible_set);
 216                 _COPY_FLAG (editable_set);
 217                 _COPY_FLAG (language_set);
 218                 _COPY_FLAG (scale_set);
 219         #undef _COPY_FLAG
 220
 221         /* Copy the data that was added manually */
 222         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse_color" );
 223
 224         if(reverse_color)
 225                 g_object_set_data( G_OBJECT(copy), "reverse_color", reverse_color );
 226
 227         return copy;
 228 }
 229
 230 /* Internal function that constructs the default styles */
 231 void
 232 style_init(ChimaraGlk *glk)
 233 {
 234         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 235
 236         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 237         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 238         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 239         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 240         GtkTextTag *tag;
 241
 242         PangoFontDescription *default_font_desc = pango_font_description_from_string("Serif");
 243         PangoFontDescription *monospace_font_desc = pango_font_description_from_string("Monospace");
 244
 245         /* Initialise the default styles for a text grid */
 246         tag = gtk_text_tag_new("default");
 247         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 248         g_hash_table_insert(default_text_grid_styles, "default", tag);
 249
 250         tag = gtk_text_tag_new("normal");
 251         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 252         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 253
 254         tag = gtk_text_tag_new("emphasized");
 255         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 256         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 257         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 258
 259         tag = gtk_text_tag_new("preformatted");
 260         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 261         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 262
 263         tag = gtk_text_tag_new("header");
 264         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 265         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 266         g_hash_table_insert(default_text_grid_styles, "header", tag);
 267
 268         tag = gtk_text_tag_new("subheader");
 269         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 270         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 271         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 272
 273         tag = gtk_text_tag_new("alert");
 274         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 275         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 276         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 277
 278         tag = gtk_text_tag_new("note");
 279         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 280         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 281         g_hash_table_insert(default_text_grid_styles, "note", tag);
 282
 283         tag = gtk_text_tag_new("block-quote");
 284         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 285         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 286         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 287
 288         tag = gtk_text_tag_new("input");
 289         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 290         g_hash_table_insert(default_text_grid_styles, "input", tag);
 291
 292         tag = gtk_text_tag_new("user1");
 293         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 294         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 295
 296         tag = gtk_text_tag_new("user2");
 297         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 298         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 299
 300         tag = gtk_text_tag_new("hyperlink");
 301         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 302         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 303
 304         /* Initialise the default styles for a text buffer */
 305         tag = gtk_text_tag_new("default");
 306         g_object_set(tag, "font-desc", default_font_desc, NULL);
 307         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 308
 309         tag = gtk_text_tag_new("normal");
 310         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 311         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 312
 313         tag = gtk_text_tag_new("emphasized");
 314         //g_object_set(tag, "font-desc", default_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 315         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 316         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 317
 318         tag = gtk_text_tag_new("preformatted");
 319         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 320         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 321
 322         tag = gtk_text_tag_new("header");
 323         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 324         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 325         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 326
 327         tag = gtk_text_tag_new("subheader");
 328         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 329         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 330         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 331
 332         tag = gtk_text_tag_new("alert");
 333         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 334         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 335         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 336
 337         tag = gtk_text_tag_new("note");
 338         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 339         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 340         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 341
 342         tag = gtk_text_tag_new("block-quote");
 343         //g_object_set(tag, "font-desc", default_font_desc, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 344         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 345         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 346
 347         tag = gtk_text_tag_new("input");
 348         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 349         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 350
 351         tag = gtk_text_tag_new("user1");
 352         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 353         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 354
 355         tag = gtk_text_tag_new("user2");
 356         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 357         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 358
 359         tag = gtk_text_tag_new("hyperlink");
 360         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 361         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 362         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 363
 364         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 365         g_object_set(pager_tag, "font-desc", default_font_desc, "foreground", "#ffffff", "background", "#000000", NULL);
 366         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 367         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 368
 369         pango_font_description_free(default_font_desc);
 370         pango_font_description_free(monospace_font_desc);
 371
 372         priv->styles->text_grid = default_text_grid_styles;
 373         priv->styles->text_buffer = default_text_buffer_styles;
 374
 375
 376         /* Initialize the GLK styles to empty tags */
 377         int i;
 378         for(i=0; i<style_NUMSTYLES; i++) {
 379                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 380                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 381                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 382                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 383         }
 384
 385         priv->glk_styles->text_grid = glk_text_grid_styles;
 386         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 387
 388 }
 389
 390 /* Reset style tables to the library's internal defaults */
 391 void
 392 reset_default_styles(ChimaraGlk *glk)
 393 {
 394         /* TODO: write this function */
 395 }
 396
 397 /* Copy the default styles to the current styles
 398  FIXME: This function is temporary and will not be needed later on */
 399 void
 400 copy_default_styles_to_current_styles(ChimaraGlk *glk)
 401 {
 402         /*
 403         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 404         g_hash_table_foreach(priv->styles->text_grid, style_table_copy, priv->glk_styles->text_grid);
 405         g_hash_table_foreach(priv->styles->text_buffer, style_table_copy, priv->glk_styles->text_buffer);
 406
 407         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 408         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 409         */
 410 }
 411
 412 /* Create the CSS file scanner */
 413 GScanner *
 414 create_css_file_scanner(void)
 415 {
 416         GScanner *scanner = g_scanner_new(NULL);
 417         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 418         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 419         scanner->config->symbol_2_token = TRUE;
 420         scanner->config->cpair_comment_single = NULL;
 421         scanner->config->scan_float = FALSE;
 422         return scanner;
 423 }
 424
 425 /* Run the scanner over the CSS file, overriding the default styles */
 426 void
 427 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 428 {
 429         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 430
 431         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 432                 if( !style_accept_style_selector(scanner, glk) )
 433                         break;
 434         }
 435
 436         g_scanner_destroy(scanner);
 437
 438         /* Update the pager prompt to the new style */
 439         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 440         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 441 }
 442
 443 /* Internal function: parses a token */
 444 static gboolean
 445 style_accept(GScanner *scanner, GTokenType token)
 446 {
 447         GTokenType next = g_scanner_get_next_token(scanner);
 448         if(next != token) {
 449                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 450                 return FALSE;
 451         }
 452         return TRUE;
 453 }
 454
 455 /* Internal function: parses a style selector */
 456 static gboolean
 457 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 458 {
 459         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 460
 461         GtkTextTag *current_tag;
 462         gchar *field;
 463         GTokenType token = g_scanner_get_next_token(scanner);
 464         GTokenValue value = g_scanner_cur_value(scanner);
 465
 466         if(
 467                 token != G_TOKEN_IDENTIFIER ||
 468                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 469         ) {
 470                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 471                 return FALSE;
 472         }
 473
 474         field = g_strdup(value.v_identifier);
 475
 476         /* Parse the tag name to change */
 477         if( g_scanner_peek_next_token(scanner) == '{') {
 478                 style_accept(scanner, '{');
 479                 if( !strcmp(field, "buffer") )
 480                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 481                 else
 482                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 483         } else {
 484                 if( !style_accept(scanner, '.') )
 485                         return FALSE;
 486
 487                 token = g_scanner_get_next_token(scanner);
 488                 value = g_scanner_cur_value(scanner);
 489
 490                 if(token != G_TOKEN_IDENTIFIER) {
 491                         g_scanner_error(scanner, "CSS Error: style selector expected");
 492                         return FALSE;
 493                 }
 494
 495                 if( !strcmp(field, "buffer") )
 496                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 497                 else
 498                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 499
 500                 if(current_tag == NULL) {
 501                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 502                         return FALSE;
 503                 }
 504
 505                 if( !style_accept(scanner, '{') )
 506                         return FALSE;
 507         }
 508
 509         while( g_scanner_peek_next_token(scanner) != '}') {
 510                 if( !style_accept_style_hint(scanner, current_tag) )
 511                         return FALSE;
 512         }
 513
 514         if( !style_accept(scanner, '}') )
 515                 return FALSE;
 516
 517         return TRUE;
 518 }
 519
 520 /* Internal function: parses a style hint */
 521 static gboolean
 522 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 523 {
 524         GTokenType token = g_scanner_get_next_token(scanner);
 525         GTokenValue value = g_scanner_cur_value(scanner);
 526         gchar *hint;
 527
 528         if(token != G_TOKEN_IDENTIFIER) {
 529                 g_scanner_error(scanner, "CSS Error: style hint expected");
 530                 return FALSE;
 531         }
 532
 533         hint = g_strdup(value.v_identifier);
 534
 535         if( !style_accept(scanner, ':') )
 536                 return FALSE;
 537
 538         token = g_scanner_get_next_token(scanner);
 539         value = g_scanner_cur_value(scanner);
 540
 541         if( !strcmp(hint, "font-family") ) {
 542                 if(token != G_TOKEN_STRING) {
 543                         g_scanner_error(scanner, "CSS Error: string expected");
 544                         return FALSE;
 545                 }
 546                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 547         }
 548         else if( !strcmp(hint, "font-weight") ) {
 549                 if(token != G_TOKEN_IDENTIFIER) {
 550                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 551                         return FALSE;
 552                 }
 553
 554                 if( !strcmp(value.v_identifier, "bold") )
 555                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 556                 else if( !strcmp(value.v_identifier, "normal") )
 557                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 558                 else {
 559                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 560                         return FALSE;
 561                 }
 562         }
 563         else if( !strcmp(hint, "font-style") ) {
 564                 if(token != G_TOKEN_IDENTIFIER) {
 565                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 566                         return FALSE;
 567                 }
 568
 569                 if( !strcmp(value.v_identifier, "italic") )
 570                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 571                 else if( !strcmp(value.v_identifier, "normal") )
 572                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 573                 else {
 574                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 575                         return FALSE;
 576                 }
 577         }
 578         else if( !strcmp(hint, "font-size") ) {
 579                 if(token == G_TOKEN_INT)
 580                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 581                 else if(token == G_TOKEN_FLOAT)
 582                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 583                 else {
 584                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 585                         return FALSE;
 586                 }
 587         }
 588         else if( !strcmp(hint, "color") ) {
 589                 if(token != G_TOKEN_IDENTIFIER) {
 590                         g_scanner_error(scanner, "CSS Error: hex color expected");
 591                         return FALSE;
 592                 }
 593
 594                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 595         }
 596         else if( !strcmp(hint, "background-color") ) {
 597                 if(token != G_TOKEN_IDENTIFIER) {
 598                         g_scanner_error(scanner, "CSS Error: hex color expected");
 599                         return FALSE;
 600                 }
 601                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 602         }
 603         else if( !strcmp(hint, "text-align") ) {
 604                 if(token != G_TOKEN_IDENTIFIER) {
 605                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 606                         return FALSE;
 607                 }
 608
 609                 if( !strcmp(value.v_identifier, "left") )
 610                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 611                 else if( !strcmp(value.v_identifier, "right") )
 612                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 613                 else if( !strcmp(value.v_identifier, "center") )
 614                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 615                 else {
 616                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 617                         return FALSE;
 618                 }
 619         }
 620         else if( !strcmp(hint, "margin-left") ) {
 621                 if(token != G_TOKEN_INT) {
 622                         g_scanner_error(scanner, "CSS Error: integer expected");
 623                         return FALSE;
 624                 }
 625                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 626         }
 627         else if( !strcmp(hint, "margin-right") ) {
 628                 if(token != G_TOKEN_INT) {
 629                         g_scanner_error(scanner, "CSS Error: integer expected");
 630                         return FALSE;
 631                 }
 632                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 633         }
 634         else if( !strcmp(hint, "margin-top") ) {
 635                 if(token != G_TOKEN_INT) {
 636                         g_scanner_error(scanner, "CSS Error: integer expected");
 637                         return FALSE;
 638                 }
 639                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 640         }
 641         else if( !strcmp(hint, "margin-bottom") ) {
 642                 if(token != G_TOKEN_INT) {
 643                         g_scanner_error(scanner, "CSS Error: integer expected");
 644                         return FALSE;
 645                 }
 646                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 647         }
 648
 649         else {
 650                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 651                 return FALSE;
 652         }
 653
 654         if( !style_accept(scanner, ';') )
 655                 return FALSE;
 656
 657         return TRUE;
 658 }
 659
 660 /* Internal function: parses a glk color to a GdkColor */
 661 void
 662 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 663 {
 664         color->red = 256 * ((val & 0xff0000) >> 16);
 665         color->green = 256 * ((val & 0x00ff00) >> 8);
 666         color->blue = 256 * (val & 0x0000ff);
 667 }
 668
 669 /* Internal function: parses a GdkColor to a glk color */
 670 static glui32
 671 gdkcolor_to_glkcolor(GdkColor *color)
 672 {
 673         g_return_val_if_fail(color != NULL, 0);
 674         return (glui32) color->pixel;
 675 }
 676
 677 /* Internal function: changes a GTK tag to correspond with the given style. */
 678 static void
 679 apply_stylehint_to_tag(GtkTextTag *tag, GtkTextTag *default_tag, glui32 wintype, glui32 hint, glsi32 val)
 680 {
 681         g_return_if_fail(tag != NULL);
 682
 683         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 684         GObject *tag_object = G_OBJECT(tag);
 685
 686         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 687
 688         int i = 0;
 689         GdkColor color;
 690         switch(hint) {
 691         case stylehint_Indentation:
 692                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 693                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 694                 break;
 695
 696         case stylehint_ParaIndentation:
 697                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 698                 break;
 699
 700         case stylehint_Justification:
 701                 switch(val) {
 702                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 703                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 704                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 705                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 706                         default:
 707                                 WARNING("Unknown justification");
 708                                 i = GTK_JUSTIFY_LEFT;
 709                 }
 710                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 711                 break;
 712
 713         case stylehint_Weight:
 714                 switch(val) {
 715                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 716                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 717                         case  1: i = PANGO_WEIGHT_BOLD; break;
 718                         default: WARNING("Unknown font weight");
 719                 }
 720                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 721                 break;
 722
 723         case stylehint_Size:
 724                 {
 725                         gdouble scale = PANGO_SCALE_MEDIUM;
 726                         switch(val) {
 727                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 728                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 729                                 case -1: scale = PANGO_SCALE_SMALL; break;
 730                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 731                                 case  1: scale = PANGO_SCALE_LARGE; break;
 732                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 733                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 734                                 default:
 735                                         /* We follow Pango's convention of having each magnification
 736                                         step be a scaling of 1.2 */
 737                                         scale = pow(1.2, (double)val);
 738                         }
 739                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 740                 }
 741                 break;
 742
 743         case stylehint_Oblique:
 744                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 745                 break;
 746
 747         case stylehint_Proportional:
 748         {
 749                 gchar *font_family;
 750                 GtkTextTag *font_tag = g_hash_table_lookup(
 751                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 752                     val? "default" : "preformatted");
 753                 g_object_get(font_tag, "family", &font_family, NULL);
 754                 g_object_set(tag_object, "family", font_family, "family-set", TRUE, NULL);
 755                 g_free(font_family);
 756         }
 757                 break;
 758
 759         case stylehint_TextColor:
 760                 glkcolor_to_gdkcolor(val, &color);
 761
 762                 if(!reverse_color)
 763                         g_object_set(tag_object, "foreground", &color, "foreground-set", TRUE, NULL);
 764                 else
 765                         g_object_set(tag_object, "background", &color, "background-set", TRUE, NULL);
 766
 767                 break;
 768
 769         case stylehint_BackColor:
 770                 glkcolor_to_gdkcolor(val, &color);
 771
 772                 if(!reverse_color)
 773                         g_object_set(tag_object, "background", &color, "background-set", TRUE, NULL);
 774                 else
 775                         g_object_set(tag_object, "foreground", &color, "background-set", TRUE, NULL);
 776
 777                 break;
 778
 779         case stylehint_ReverseColor:
 780                 if(reverse_color != val) {
 781                         /* Flip the fore- and background colors */
 782                         GdkColor* foreground_color;
 783                         GdkColor* background_color;
 784                         gint f_set, b_set, df_set, db_set = 0;
 785                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 786                         g_object_get(default_tag, "foreground-set", &df_set, "background-set", &db_set, NULL);
 787
 788                         if(f_set)
 789                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 790                         else if(df_set)
 791                                 g_object_get(default_tag, "foreground-gdk", &foreground_color, NULL);
 792                         if(b_set)
 793                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 794                         else if(db_set)
 795                                 g_object_get(default_tag, "background-gdk", &background_color, NULL);
 796
 797                         if(b_set || db_set)
 798                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 799                         else
 800                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 801
 802                         if(f_set || df_set)
 803                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 804                         else
 805                                 g_object_set(tag_object, "background", "#000000", NULL);
 806
 807                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 808                 }
 809                 break;
 810
 811         default:
 812                 WARNING("Unknown style hint");
 813         }
 814 }
 815
 816 /* Internal function: queries a text tag for the value of a given style hint */
 817 static gint
 818 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 819 {
 820         gint intval;
 821         gdouble doubleval;
 822         GdkColor *colval;
 823
 824         g_return_val_if_fail(tag != NULL, 0);
 825
 826         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 827
 828         switch(hint) {
 829         case stylehint_Indentation:
 830                 g_object_get(tag, "left_margin", &intval, NULL);
 831                 return intval/5;
 832
 833         case stylehint_ParaIndentation:
 834                 g_object_get(tag, "indent", &intval, NULL);
 835                 return intval/5;
 836
 837         case stylehint_Justification:
 838                 g_object_get(tag, "justification", &intval, NULL);
 839                 switch(intval) {
 840                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 841                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 842                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 843                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 844                         default:
 845                                 WARNING("Unknown justification");
 846                                 return stylehint_just_LeftFlush;
 847                 }
 848
 849         case stylehint_Weight:
 850                 g_object_get(tag, "weight", &intval, NULL);
 851                 switch(intval) {
 852                         case PANGO_WEIGHT_LIGHT: return -1;
 853                         case PANGO_WEIGHT_NORMAL: return 0;
 854                         case PANGO_WEIGHT_BOLD: return 1;
 855                         default: WARNING("Unknown font weight"); return 0;
 856                 }
 857
 858         case stylehint_Size:
 859                 g_object_get(tag, "scale", &doubleval, NULL);
 860                 return (gint)round(log(doubleval) / log(1.2));
 861
 862         case stylehint_Oblique:
 863                 g_object_get(tag, "style", &intval , NULL);
 864                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 865
 866         case stylehint_Proportional:
 867                 /* Use pango_font_family_is_monospace()? */
 868         {
 869                 gchar *font_family, *query_font_family;
 870                 GtkTextTag *font_tag = g_hash_table_lookup(
 871                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 872                     "preformatted");
 873                 g_object_get(font_tag, "family", &font_family, NULL);
 874                 g_object_get(tag, "family", &query_font_family, NULL);
 875                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 876                 g_free(font_family);
 877                 g_free(query_font_family);
 878                 return retval;
 879         }
 880
 881         case stylehint_TextColor:
 882                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 883                 return gdkcolor_to_glkcolor(colval);
 884
 885         case stylehint_BackColor:
 886                 g_object_get(tag, "background-gdk", &colval, NULL);
 887                 return gdkcolor_to_glkcolor(colval);
 888
 889         case stylehint_ReverseColor:
 890                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 891
 892         default:
 893                 WARNING("Unknown style hint");
 894         }
 895
 896         return 0;
 897 }
 898
 899 /**
 900  * glk_stylehint_set:
 901  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 902  * @styl: The style to set a hint for.
 903  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 904  * @val: The style hint. The meaning of this depends on @hint.
 905  *
 906  * Sets a hint about the appearance of one style for a particular type of
 907  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 908  * all types of window.
 909  * <note><para>
 910  *  There is no equivalent constant to set a hint for all styles of a single
 911  *  window type.
 912  * </para></note>
 913  */
 914 void
 915 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 916 {
 917         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 918
 919         GtkTextTag *to_change, *default_tag;
 920         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 921                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 922                 default_tag = g_hash_table_lookup( glk_data->styles->text_buffer, get_tag_name(styl) );
 923                 apply_stylehint_to_tag(to_change, default_tag, wintype_TextBuffer, hint, val);
 924         }
 925
 926         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 927                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 928                 default_tag = g_hash_table_lookup( glk_data->styles->text_grid, get_tag_name(styl) );
 929                 apply_stylehint_to_tag(to_change, default_tag, wintype_TextGrid, hint, val);
 930         }
 931 }
 932
 933 /**
 934  * glk_stylehint_clear:
 935  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 936  * @styl: The style to set a hint for.
 937  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 938  *
 939  * Clears a hint about the appearance of one style for a particular type of
 940  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 941  * which clears a hint for all types of window.
 942  * <note><para>
 943  *  There is no equivalent constant to reset a hint for all styles of a single
 944  *  window type.
 945  * </para></note>
 946  */
 947 void
 948 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 949 {
 950         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 951         GtkTextTag *tag;
 952
 953         switch(wintype) {
 954         case wintype_TextBuffer:
 955                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 956                 if(tag) {
 957                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 958                 }
 959                 break;
 960         case wintype_TextGrid:
 961                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 962                 if(tag) {
 963                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 964                 }
 965         default:
 966                 return;
 967         }
 968 }
 969
 970 /**
 971  * glk_style_distinguish:
 972  * @win: The window in which the styles are to be distinguished.
 973  * @styl1: The first style to be distinguished from the second style.
 974  * @styl2: The second style to be distinguished from the first style.
 975  *
 976  * Decides whether two styles are visually distinguishable in the given window.
 977  * The exact meaning of this is left for the library to determine.
 978  * <note><title>Chimara</title><para>
 979  *   Currently, all styles of one window are assumed to be mutually
 980  *   distinguishable.
 981  * </para></note>
 982  *
 983  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 984  * are not, it returns %FALSE (0).
 985  */
 986 glui32
 987 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 988 {
 989         /* FIXME */
 990         return styl1 != styl2;
 991 }
 992
 993 /**
 994  * glk_style_measure:
 995  * @win: The window from which to take the style.
 996  * @styl: The style to perform the measurement on.
 997  * @hint: The stylehint to measure.
 998  * @result: Address to write the result to.
 999  *
1000  * Tries to test an attribute of one style in the given window @win. The library
1001  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1002  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1003  * at by @result.
1004  * <note><para>
1005  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1006  * </para></note>
1007  *
1008  * The meaning of the value depends on the hint which was tested:
1009  * <variablelist>
1010  * <varlistentry>
1011  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1012  *   <listitem><para>The indentation and paragraph indentation. These are in a
1013  *   metric which is platform-dependent.</para>
1014  *   <note><para>Most likely either characters or pixels.</para></note>
1015  *   </listitem>
1016  * </varlistentry>
1017  * <varlistentry>
1018  *   <term>%stylehint_Justification</term>
1019  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1020  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1021  *   %stylehint_just_RightFlush.</para></listitem>
1022  * </varlistentry>
1023  * <varlistentry>
1024  *   <term>%stylehint_Size</term>
1025  *   <listitem><para>The font size. Again, this is in a platform-dependent
1026  *   metric.</para>
1027  *   <note><para>Pixels, points, or simply 1 if the library does not support
1028  *   varying font sizes.</para></note>
1029  *   </listitem>
1030  * </varlistentry>
1031  * <varlistentry>
1032  *   <term>%stylehint_Weight</term>
1033  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1034  *   and -1 for light-weight fonts.</para></listitem>
1035  * </varlistentry>
1036  * <varlistentry>
1037  *   <term>%stylehint_Oblique</term>
1038  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1039  *   </listitem>
1040  * </varlistentry>
1041  * <varlistentry>
1042  *   <term>%stylehint_Proportional</term>
1043  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1044  *   </para></listitem>
1045  * </varlistentry>
1046  * <varlistentry>
1047  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1048  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1049  *   described in <link
1050  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1051  *   Appearance of Styles</link>.</para></listitem>
1052  * </varlistentry>
1053  * <varlistentry>
1054  *   <term>%stylehint_ReverseColor</term>
1055  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1056  *   colors are reversed.</para></listitem>
1057  * </varlistentry>
1058  * </variablelist>
1059  *
1060  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1061  */
1062 glui32
1063 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1064 {
1065         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1066         GtkTextTag *tag;
1067
1068         switch(win->type) {
1069         case wintype_TextBuffer:
1070                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1071                 if(result)
1072                         *result = query_tag(tag, win->type, hint);
1073                 break;
1074         case wintype_TextGrid:
1075                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1076                 if(result)
1077                         *result = query_tag(tag, win->type, hint);
1078         default:
1079                 return FALSE;
1080         }
1081
1082         return TRUE;
1083 }
1084
1085 /* Internal function returning the current default font for a window type
1086  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1087  * supported for now */
1088 PangoFontDescription *
1089 get_current_font(guint32 wintype)
1090 {
1091         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1092         GtkTextTag *tag;
1093
1094         switch(wintype) {
1095         case wintype_TextGrid:
1096                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1097                 break;
1098         case wintype_TextBuffer:
1099                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1100                 break;
1101         default:
1102                 return NULL;
1103         }
1104
1105         PangoFontDescription *font;
1106         g_object_get( G_OBJECT(tag), "font-desc", &font, NULL );
1107
1108         return font;
1109 }
1110
1111 /* Internal function copying the attributes of a text tag to a pango attribute list */
1112 static void
1113 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1114 {
1115         gboolean set;
1116         GdkColor *foreground, *background;
1117         gchar *string;
1118         PangoFontDescription *font_desc;
1119         gboolean strikethrough;
1120         PangoUnderline underline;
1121
1122         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1123         if(set) {
1124                 pango_attr_list_insert(
1125                         list,
1126                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1127                 );
1128         }
1129         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1130         if(set) {
1131                 pango_attr_list_insert(
1132                         list,
1133                         pango_attr_background_new(background->red, background->green, background->blue)
1134                 );
1135         }
1136         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1137         if(set) {
1138                 pango_attr_list_insert(
1139                         list,
1140                         pango_attr_language_new( pango_language_from_string(string) )
1141                 );
1142         }
1143
1144         /* Font description updates the following properties simultaniously:
1145          * family, style, weight, variant, stretch, size
1146          */
1147         g_object_get(tag, "font-desc", &font_desc, NULL);
1148         pango_attr_list_insert(
1149                 list,
1150                 pango_attr_font_desc_new(font_desc)
1151         );
1152
1153         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1154         if(set) {
1155                 pango_attr_list_insert(
1156                         list,
1157                         pango_attr_strikethrough_new(strikethrough)
1158                 );
1159         }
1160         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1161         if(set) {
1162                 pango_attr_list_insert(
1163                         list,
1164                         pango_attr_underline_new(underline)
1165                 );
1166         }
1167 }
1168
1169 /* Update pager and reverse video tags */
1170 void
1171 style_update(ChimaraGlk *glk)
1172 {
1173         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1174
1175         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1176         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1177 }