libchimara/style.c

   1 #include "style.h"
   2 #include <stdio.h>
   3 #include <fcntl.h>
   4
   5 extern GPrivate *glk_data_key;
   6 static gboolean chimara_style_initialized = FALSE;
   7
   8 static gboolean style_accept(GScanner *scanner, GTokenType token);
   9 static gboolean style_accept_style_selector(GScanner *scanner);
  10 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  11 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  12 static void style_table_copy(gpointer key, gpointer tag, gpointer target_table);
  13 static GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  14
  15 /**
  16  * glk_set_style:
  17  * @styl: The style to apply
  18  *
  19  * Changes the style of the current output stream. @styl should be one of the
  20  * <code>style_</code> constants listed above. However, any value is actually
  21  * legal; if the interpreter does not recognize the style value, it will treat
  22  * it as %style_Normal.
  23  * <note><para>
  24  *  This policy allows for the future definition of styles without breaking old
  25  *  Glk libraries.
  26  * </para></note>
  27  */
  28 void
  29 glk_set_style(glui32 styl)
  30 {
  31         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  32         g_return_if_fail(glk_data->current_stream != NULL);
  33         glk_set_style_stream(glk_data->current_stream, styl);
  34 }
  35
  36 /* Internal function: mapping from style enum to tag name */
  37 static gchar*
  38 get_tag_name(glui32 style)
  39 {
  40         if(style >= style_NUMSTYLES) {
  41                 WARNING("Unsupported style");
  42                 return "normal";
  43         } else {
  44                 return (gchar*) TAG_NAMES[style];
  45         }
  46 }
  47
  48 /**
  49  * glk_set_style_stream:
  50  * @str: Output stream to change the style of
  51  * @styl: The style to apply
  52  *
  53  * This changes the style of the stream @str. See glk_set_style().
  54  */
  55 void
  56 glk_set_style_stream(strid_t str, glui32 styl) {
  57         str->style = get_tag_name(styl);
  58 }
  59
  60 /* Internal function: call this to initialize the default styles to a textbuffer. */
  61 void
  62 style_init_textbuffer(GtkTextBuffer *buffer)
  63 {
  64         g_return_if_fail(buffer != NULL);
  65
  66         if( G_UNLIKELY(!chimara_style_initialized) ) {
  67                 style_init();
  68         }
  69
  70         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  71         g_hash_table_foreach(glk_data->current_styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  72 }
  73
  74 /* Internal function: call this to initialize the default styles to a textgrid. */
  75 void
  76 style_init_textgrid(GtkTextBuffer *buffer)
  77 {
  78         g_return_if_fail(buffer != NULL);
  79
  80         if( G_UNLIKELY(!chimara_style_initialized) ) {
  81                 style_init();
  82         }
  83
  84         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  85         g_hash_table_foreach(glk_data->current_styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  86 }
  87
  88 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
  89 static void
  90 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
  91 {
  92         gtk_text_tag_table_add( tag_table, gtk_text_tag_copy(tag) );
  93 }
  94
  95 /* Internal function used to iterate over a style table, copying it */
  96 static void
  97 style_table_copy(gpointer key, gpointer tag, gpointer target_table)
  98 {
  99         g_return_if_fail(key != NULL);
 100         g_return_if_fail(tag != NULL);
 101         g_return_if_fail(target_table != NULL);
 102
 103         g_hash_table_insert(target_table, key, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 104 }
 105
 106 /* Internal function that copies a text tag */
 107 static GtkTextTag*
 108 gtk_text_tag_copy(GtkTextTag *tag)
 109 {
 110         GtkTextTag *copy;
 111
 112         g_return_val_if_fail(tag != NULL, NULL);
 113
 114         copy = gtk_text_tag_new(tag->name);
 115         gtk_text_attributes_copy_values(tag->values, copy->values);
 116
 117         #define _COPY_FLAG(flag) copy->flag = tag->flag
 118                 _COPY_FLAG (bg_color_set);
 119                 _COPY_FLAG (bg_color_set);
 120                 _COPY_FLAG (bg_stipple_set);
 121                 _COPY_FLAG (fg_color_set);
 122                 _COPY_FLAG (fg_stipple_set);
 123                 _COPY_FLAG (justification_set);
 124                 _COPY_FLAG (left_margin_set);
 125                 _COPY_FLAG (indent_set);
 126                 _COPY_FLAG (rise_set);
 127                 _COPY_FLAG (strikethrough_set);
 128                 _COPY_FLAG (right_margin_set);
 129                 _COPY_FLAG (pixels_above_lines_set);
 130                 _COPY_FLAG (pixels_below_lines_set);
 131                 _COPY_FLAG (pixels_inside_wrap_set);
 132                 _COPY_FLAG (tabs_set);
 133                 _COPY_FLAG (underline_set);
 134                 _COPY_FLAG (wrap_mode_set);
 135                 _COPY_FLAG (bg_full_height_set);
 136                 _COPY_FLAG (invisible_set);
 137                 _COPY_FLAG (editable_set);
 138                 _COPY_FLAG (language_set);
 139         #undef _COPY_FLAG
 140
 141         return copy;
 142 }
 143
 144 /* Internal function that reads the default styles from a CSS file */
 145 void
 146 style_init()
 147 {
 148         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 149         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 150         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 151         GHashTable *current_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 152         GHashTable *current_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 153         GtkTextTag *tag;
 154
 155         /* Create the CSS file scanner */
 156         GScanner *scanner = g_scanner_new(NULL);
 157
 158         int f = open(glk_data->css_file, O_RDONLY);
 159         g_return_if_fail(f != -1);
 160         g_scanner_input_file(scanner, f);
 161         scanner->input_name = glk_data->css_file;
 162         scanner->config->cset_identifier_first = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ#";
 163         scanner->config->cset_identifier_nth = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789";
 164         scanner->config->symbol_2_token = TRUE;
 165         scanner->config->cpair_comment_single = NULL;
 166         scanner->config->scan_float = FALSE;
 167
 168         /* Initialise the default styles */
 169         g_hash_table_insert(default_text_grid_styles, "normal", gtk_text_tag_new("normal"));
 170
 171         tag = gtk_text_tag_new("emphasized");
 172         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 173         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 174
 175         tag = gtk_text_tag_new("preformatted");
 176         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 177         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 178
 179         tag = gtk_text_tag_new("header");
 180         g_object_set(tag, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 181         g_hash_table_insert(default_text_grid_styles, "header", tag);
 182
 183         tag = gtk_text_tag_new("subheader");
 184         g_object_set(tag, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 185         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 186
 187         tag = gtk_text_tag_new("alert");
 188         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 189         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 190
 191         tag = gtk_text_tag_new("note");
 192         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 193         g_hash_table_insert(default_text_grid_styles, "note", tag);
 194
 195         tag = gtk_text_tag_new("block-quote");
 196         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, NULL);
 197         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 198
 199         g_hash_table_insert(default_text_grid_styles, "input", gtk_text_tag_new("input"));
 200         g_hash_table_insert(default_text_grid_styles, "user1", gtk_text_tag_new("user1"));
 201         g_hash_table_insert(default_text_grid_styles, "user2", gtk_text_tag_new("user2"));
 202
 203         g_hash_table_foreach(default_text_grid_styles, style_table_copy, default_text_buffer_styles);
 204         glk_data->default_styles->text_grid = default_text_grid_styles;
 205         glk_data->default_styles->text_buffer = default_text_buffer_styles;
 206
 207         /* Run the scanner over the CSS file, overriding defaults */
 208         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 209                 if( !style_accept_style_selector(scanner) )
 210                         break;
 211         }
 212
 213         /* Set the current style to a copy of the default style */
 214         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 215         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 216         glk_data->current_styles->text_grid = current_text_grid_styles;
 217         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 218
 219         g_scanner_destroy(scanner);
 220
 221         chimara_style_initialized = TRUE;
 222 }
 223
 224 /* Internal function: parses a token */
 225 static gboolean
 226 style_accept(GScanner *scanner, GTokenType token)
 227 {
 228         GTokenType next = g_scanner_get_next_token(scanner);
 229         if(next != token ) {
 230                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 231                 return FALSE;
 232         } else {
 233                 return TRUE;
 234         }
 235 }
 236
 237 /* Internal function: parses a style selector */
 238 static gboolean
 239 style_accept_style_selector(GScanner *scanner)
 240 {
 241         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 242
 243         GtkTextTag *current_tag;
 244         gchar *field;
 245         GTokenType token = g_scanner_get_next_token(scanner);
 246         GTokenValue value = g_scanner_cur_value(scanner);
 247
 248         if(
 249                 token != G_TOKEN_IDENTIFIER ||
 250                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 251         ) {
 252                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 253                 return FALSE;
 254         }
 255
 256         field = g_strdup(value.v_identifier);
 257
 258         if( !style_accept(scanner, '.') )
 259                 return FALSE;
 260
 261         token = g_scanner_get_next_token(scanner);
 262         value = g_scanner_cur_value(scanner);
 263
 264         if(token != G_TOKEN_IDENTIFIER) {
 265                 g_scanner_error(scanner, "CSS Error: style selector expected");
 266                 return FALSE;
 267         }
 268
 269         if( !strcmp(field, "buffer") )
 270                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 271         else
 272                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 273
 274         if(current_tag == NULL) {
 275                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 276                 return FALSE;
 277         }
 278
 279         if( !style_accept(scanner, '{') )
 280                 return FALSE;
 281
 282         while( g_scanner_peek_next_token(scanner) != '}') {
 283                 if( !style_accept_style_hint(scanner, current_tag) )
 284                         return FALSE;
 285         }
 286
 287         if( !style_accept(scanner, '}') )
 288                 return FALSE;
 289
 290         return TRUE;
 291 }
 292
 293 /* Internal function: parses a style hint */
 294 static gboolean
 295 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 296 {
 297         GTokenType token = g_scanner_get_next_token(scanner);
 298         GTokenValue value = g_scanner_cur_value(scanner);
 299         gchar *hint;
 300
 301         if(token != G_TOKEN_IDENTIFIER) {
 302                 g_scanner_error(scanner, "CSS Error: style hint expected");
 303                 return FALSE;
 304         }
 305
 306         hint = g_strdup(value.v_identifier);
 307
 308         if( !style_accept(scanner, ':') )
 309                 return FALSE;
 310
 311         token = g_scanner_get_next_token(scanner);
 312         value = g_scanner_cur_value(scanner);
 313
 314         if( !strcmp(hint, "font-family") ) {
 315                 if(token != G_TOKEN_STRING) {
 316                         g_scanner_error(scanner, "CSS Error: string expected");
 317                         return FALSE;
 318                 }
 319                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 320         }
 321         else if( !strcmp(hint, "font-weight") ) {
 322                 if(token != G_TOKEN_IDENTIFIER) {
 323                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 324                         return FALSE;
 325                 }
 326
 327                 if( !strcmp(value.v_identifier, "bold") )
 328                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 329                 else if( !strcmp(value.v_identifier, "normal") )
 330                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 331                 else {
 332                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 333                         return FALSE;
 334                 }
 335         }
 336         else if( !strcmp(hint, "font-style") ) {
 337                 if(token != G_TOKEN_IDENTIFIER) {
 338                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 339                         return FALSE;
 340                 }
 341
 342                 if( !strcmp(value.v_identifier, "italic") )
 343                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 344                 else if( !strcmp(value.v_identifier, "normal") )
 345                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 346                 else {
 347                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 348                         return FALSE;
 349                 }
 350         }
 351         else if( !strcmp(hint, "font-size") ) {
 352                 if(token == G_TOKEN_INT)
 353                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 354                 else if(token == G_TOKEN_FLOAT)
 355                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 356                 else {
 357                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 358                         return FALSE;
 359                 }
 360         }
 361         else if( !strcmp(hint, "color") ) {
 362                 if(token != G_TOKEN_IDENTIFIER) {
 363                         g_scanner_error(scanner, "CSS Error: hex color expected");
 364                         return FALSE;
 365                 }
 366
 367                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 368         }
 369         else if( !strcmp(hint, "background-color") ) {
 370                 if(token != G_TOKEN_IDENTIFIER) {
 371                         g_scanner_error(scanner, "CSS Error: hex color expected");
 372                         return FALSE;
 373                 }
 374                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 375         }
 376         else if( !strcmp(hint, "text-align") ) {
 377                 if(token != G_TOKEN_IDENTIFIER) {
 378                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 379                         return FALSE;
 380                 }
 381
 382                 if( !strcmp(value.v_identifier, "left") )
 383                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 384                 else if( !strcmp(value.v_identifier, "right") )
 385                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 386                 else if( !strcmp(value.v_identifier, "center") )
 387                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 388                 else {
 389                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 390                         return FALSE;
 391                 }
 392         }
 393         else if( !strcmp(hint, "margin-left") ) {
 394                 if(token != G_TOKEN_INT) {
 395                         g_scanner_error(scanner, "CSS Error: integer expected");
 396                         return FALSE;
 397                 }
 398                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 399         }
 400         else if( !strcmp(hint, "margin-right") ) {
 401                 if(token != G_TOKEN_INT) {
 402                         g_scanner_error(scanner, "CSS Error: integer expected");
 403                         return FALSE;
 404                 }
 405                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 406         }
 407         else if( !strcmp(hint, "margin-top") ) {
 408                 if(token != G_TOKEN_INT) {
 409                         g_scanner_error(scanner, "CSS Error: integer expected");
 410                         return FALSE;
 411                 }
 412                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 413         }
 414         else if( !strcmp(hint, "margin-bottom") ) {
 415                 if(token != G_TOKEN_INT) {
 416                         g_scanner_error(scanner, "CSS Error: integer expected");
 417                         return FALSE;
 418                 }
 419                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 420         }
 421
 422         else {
 423                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 424                 return FALSE;
 425         }
 426
 427         if( !style_accept(scanner, ';') )
 428                 return FALSE;
 429
 430         return TRUE;
 431 }
 432
 433 /* Internal function: parses a glk color to a #hex-value */
 434 static void
 435 color_format(glui32 val, gchar *buffer)
 436 {
 437         g_return_if_fail(buffer != NULL);
 438
 439         sprintf(buffer, "#%02X%02X%02X",
 440                 ((val & 0xff0000) >> 16),
 441                 ((val & 0x00ff00) >> 8),
 442                 (val & 0x0000ff)
 443         );
 444 }
 445
 446 /* Internal function: parses a GdkColor to a glk color */
 447 static glui32
 448 color_parse_gdk(GdkColor *color)
 449 {
 450         g_return_val_if_fail(color != NULL, 0);
 451         return (glui32) color->pixel;
 452 }
 453
 454 /* Internal function: changes a GTK tag to correspond with the given style. */
 455 static void
 456 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 457 {
 458         g_return_if_fail(tag != NULL);
 459
 460         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 461         GObject *tag_object = G_OBJECT(tag);
 462         gint reverse_color = 0;
 463
 464         /* FIXME where should we keep track of this?
 465         g_object_get(tag, "reverse_color", &reverse_color, NULL);
 466         */
 467
 468         int i = 0;
 469         gchar color[20];
 470         switch(hint) {
 471         case stylehint_Indentation:
 472                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 473                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 474                 break;
 475
 476         case stylehint_ParaIndentation:
 477                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 478                 break;
 479
 480         case stylehint_Justification:
 481                 switch(val) {
 482                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 483                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 484                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 485                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 486                         default:
 487                                 WARNING("Unknown justification");
 488                                 i = GTK_JUSTIFY_LEFT;
 489                 }
 490                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 491                 break;
 492
 493         case stylehint_Weight:
 494                 switch(val) {
 495                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 496                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 497                         case  1: i = PANGO_WEIGHT_BOLD; break;
 498                         default: WARNING("Unknown font weight");
 499                 }
 500                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 501                 break;
 502
 503         case stylehint_Size:
 504                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 505                 break;
 506
 507         case stylehint_Oblique:
 508                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 509                 break;
 510
 511         case stylehint_Proportional:
 512                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 513                 break;
 514
 515         case stylehint_TextColor:
 516                 color_format(val, color);
 517
 518                 if(!reverse_color)
 519                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 520                 else
 521                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 522
 523                 break;
 524
 525         case stylehint_BackColor:
 526                 color_format(val, color);
 527
 528                 if(!reverse_color)
 529                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 530                 else
 531                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 532
 533                 break;
 534
 535         case stylehint_ReverseColor:
 536                 if(reverse_color != val) {
 537                         /* Flip the fore- and background colors */
 538                         GdkColor* foreground_color;
 539                         GdkColor* background_color;
 540                         gint f_set, b_set = 0;
 541                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 542
 543                         if(f_set)
 544                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 545                         if(b_set)
 546                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 547
 548                         if(b_set)
 549                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 550                         else
 551                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 552
 553                         if(f_set)
 554                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 555                         else
 556                                 g_object_set(tag_object, "background", "#000000", NULL);
 557                 }
 558                 break;
 559
 560         default:
 561                 WARNING("Unknown style hint");
 562         }
 563 }
 564 /*Internal function: queries a text tag for the value of a given style hint */
 565 static gint
 566 query_tag(GtkTextTag *tag, glui32 hint)
 567 {
 568         gint intval;
 569         GObject *objval;
 570         GdkColor *colval;
 571
 572         g_return_val_if_fail(tag != NULL, 0);
 573
 574         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 575
 576         switch(hint) {
 577         case stylehint_Indentation:
 578                 g_object_get(tag, "left_margin", &intval, NULL);
 579                 return intval/5;
 580                 break;
 581
 582         case stylehint_ParaIndentation:
 583                 g_object_get(tag, "indent", &intval, NULL);
 584                 return intval/5;
 585                 break;
 586
 587         case stylehint_Justification:
 588                 g_object_get(tag, "justification", &intval, NULL);
 589                 switch(intval) {
 590                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 591                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 592                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 593                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 594                         default:
 595                                 WARNING("Unknown justification");
 596                                 return stylehint_just_LeftFlush;
 597                 }
 598                 break;
 599
 600         case stylehint_Weight:
 601                 g_object_get(tag, "weight", &intval, NULL);
 602                 switch(intval) {
 603                         case PANGO_WEIGHT_LIGHT: return -1; break;
 604                         case PANGO_WEIGHT_NORMAL: return 0; break;
 605                         case PANGO_WEIGHT_BOLD: return 1; break;
 606                         default: WARNING("Unknown font weight"); return 0;
 607                 }
 608                 break;
 609
 610         case stylehint_Size:
 611                 g_object_get(tag, "size", &intval, NULL);
 612                 return (intval/2)-14;
 613                 break;
 614
 615         case stylehint_Oblique:
 616                 g_object_get(tag, "style", &intval , NULL);
 617                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 618                 break;
 619
 620         case stylehint_Proportional:
 621                 g_object_get(tag, "font-desc", &objval, NULL);
 622                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 623                 break;
 624
 625         case stylehint_TextColor:
 626                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 627                 return color_parse_gdk(colval);
 628                 break;
 629
 630         case stylehint_BackColor:
 631                 g_object_get(tag, "background-gdk", &colval, NULL);
 632                 return color_parse_gdk(colval);
 633                 break;
 634
 635         case stylehint_ReverseColor:
 636                 /* FIXME: implement this */
 637                 return 0;
 638                 break;
 639
 640         default:
 641                 WARNING("Unknown style hint");
 642         }
 643
 644         return 0;
 645 }
 646
 647 /**
 648  * glk_stylehint_set:
 649  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 650  * @styl: The style to set a hint for.
 651  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 652  * @val: The style hint. The meaning of this depends on @hint.
 653  *
 654  * Sets a hint about the appearance of one style for a particular type of
 655  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 656  * all types of window.
 657  * <note><para>
 658  *  There is no equivalent constant to set a hint for all styles of a single
 659  *  window type.
 660  * </para></note>
 661  */
 662 void
 663 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 664 {
 665         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 666
 667         if( G_UNLIKELY(!chimara_style_initialized) ) {
 668                 style_init();
 669         }
 670
 671         GtkTextTag *to_change;
 672         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 673                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 674                 apply_stylehint_to_tag(to_change, hint, val);
 675         }
 676
 677         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 678                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 679                 apply_stylehint_to_tag(to_change, hint, val);
 680         }
 681 }
 682
 683 void
 684 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 685 {
 686         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 687         GtkTextTag *tag;
 688
 689         switch(wintype) {
 690         case wintype_TextBuffer:
 691                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 692                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 693                 break;
 694         case wintype_TextGrid:
 695                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 696                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 697         default:
 698                 return;
 699         }
 700 }
 701
 702 glui32
 703 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 704 {
 705         return styl1 != styl2;
 706 }
 707
 708 glui32
 709 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 710 {
 711         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 712         GtkTextTag *tag;
 713
 714         switch(win->type) {
 715         case wintype_TextBuffer:
 716                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 717                 *result = query_tag(tag, hint);
 718                 break;
 719         case wintype_TextGrid:
 720                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 721                 *result = query_tag(tag, hint);
 722         default:
 723                 return FALSE;
 724         }
 725
 726         return TRUE;
 727 }