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