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_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 static void style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background);
  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         "default"
  57 };
  58
  59 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
  60 static const gchar* GLK_TAG_NAMES[] = {
  61         "glk-normal",
  62         "glk-emphasized",
  63         "glk-preformatted",
  64         "glk-header",
  65         "glk-subheader",
  66         "glk-alert",
  67         "glk-note",
  68         "glk-block-quote",
  69         "glk-input",
  70         "glk-user1",
  71         "glk-user2"
  72 };
  73
  74 const gchar**
  75 style_get_tag_names()
  76 {
  77         return TAG_NAMES;
  78 }
  79
  80 /* Internal function: mapping from style enum to tag name */
  81 static const gchar*
  82 get_tag_name(glui32 style)
  83 {
  84         if(style >= CHIMARA_NUM_STYLES) {
  85                 WARNING("Unsupported style");
  86                 return "normal";
  87         } else {
  88                 return (gchar*) TAG_NAMES[style];
  89         }
  90 }
  91
  92 /* Internal function: mapping from glk style enum to tag name */
  93 static const gchar*
  94 get_glk_tag_name(glui32 style)
  95 {
  96         if(style >= style_NUMSTYLES) {
  97                 WARNING("Unsupported style");
  98                 return "normal";
  99         } else {
 100                 return (gchar*) GLK_TAG_NAMES[style];
 101         }
 102 }
 103
 104 /**
 105  * glk_set_style_stream:
 106  * @str: Output stream to change the style of
 107  * @styl: The style to apply
 108  *
 109  * This changes the style of the stream @str. See glk_set_style().
 110  */
 111 void
 112 glk_set_style_stream(strid_t str, glui32 styl) {
 113 #ifdef DEBUG_STYLES
 114         g_printf("glk_set_style(str->rock=%d, styl=%d)\n", str->rock, styl);
 115 #endif
 116
 117         if(str->window == NULL)
 118                 return;
 119
 120         flush_window_buffer(str->window);
 121         str->style = (gchar*) get_tag_name(styl);
 122         str->glk_style = (gchar*) get_glk_tag_name(styl);
 123 }
 124
 125 /* Internal function: call this to initialize the default styles to a textbuffer. */
 126 void
 127 style_init_textbuffer(GtkTextBuffer *buffer)
 128 {
 129         g_return_if_fail(buffer != NULL);
 130
 131         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 132
 133         /* Place the default text tags in the textbuffer's tag table */
 134         g_hash_table_foreach(glk_data->styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 135
 136         /* Copy the override text tags to the textbuffers's tag table */
 137         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 138
 139         /* Assign the 'default' tag the lowest priority */
 140         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
 141 }
 142
 143
 144 /* Internal function: call this to initialize the default styles to a textgrid. */
 145 void
 146 style_init_textgrid(GtkTextBuffer *buffer)
 147 {
 148         g_return_if_fail(buffer != NULL);
 149
 150         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 151
 152         /* Place the default text tags in the textbuffer's tag table */
 153         g_hash_table_foreach(glk_data->styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 154
 155         /* Copy the current text tags to the textbuffers's tag table */
 156         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 157
 158         /* Assign the 'default' tag the lowest priority */
 159         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
 160 }
 161
 162 /* Internal function used to iterate over a style table, copying it */
 163 static void
 164 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 165 {
 166         g_return_if_fail(key != NULL);
 167         g_return_if_fail(tag != NULL);
 168         g_return_if_fail(target_table != NULL);
 169
 170         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 171 }
 172
 173 /* Internal function that copies a text tag */
 174 GtkTextTag *
 175 gtk_text_tag_copy(GtkTextTag *tag)
 176 {
 177         GtkTextTag *copy;
 178         char *tag_name;
 179         GParamSpec **properties;
 180         unsigned nprops, count;
 181
 182         g_return_val_if_fail(tag != NULL, NULL);
 183
 184         g_object_get(tag, "name", &tag_name, NULL);
 185         copy = gtk_text_tag_new(tag_name);
 186         g_free(tag_name);
 187
 188         /* Copy all the original tag's properties to the new tag */
 189         properties = g_object_class_list_properties( G_OBJECT_GET_CLASS(tag), &nprops );
 190         for(count = 0; count < nprops; count++) {
 191
 192                 /* Only copy properties that are readable, writable, not construct-only,
 193                 and not deprecated */
 194                 GParamFlags flags = properties[count]->flags;
 195                 if(flags & G_PARAM_CONSTRUCT_ONLY
 196                         || flags & G_PARAM_DEPRECATED
 197                         || !(flags & G_PARAM_READABLE)
 198                         || !(flags & G_PARAM_WRITABLE))
 199                         continue;
 200
 201                 const char *prop_name = g_param_spec_get_name(properties[count]);
 202                 GValue prop_value = G_VALUE_INIT;
 203
 204                 g_value_init( &prop_value, G_PARAM_SPEC_VALUE_TYPE(properties[count]) );
 205                 g_object_get_property( G_OBJECT(tag), prop_name, &prop_value );
 206                 /* Don't copy the PangoTabArray if it is NULL, that prints a warning */
 207                 if(strcmp(prop_name, "tabs") == 0 && g_value_get_boxed(&prop_value) == NULL) {
 208                         g_value_unset(&prop_value);
 209                         continue;
 210                 }
 211                 g_object_set_property( G_OBJECT(copy), prop_name, &prop_value );
 212                 g_value_unset(&prop_value);
 213         }
 214         g_free(properties);
 215
 216         /* Copy the data that was added manually */
 217         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse-color" );
 218
 219         if(reverse_color) {
 220                 g_object_set_data( G_OBJECT(copy), "reverse-color", reverse_color );
 221         }
 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         /* Initialise the default styles for a text grid */
 239         tag = gtk_text_tag_new("default");
 240         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 241         g_hash_table_insert(default_text_grid_styles, "default", tag);
 242
 243         tag = gtk_text_tag_new("normal");
 244         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 245
 246         tag = gtk_text_tag_new("emphasized");
 247         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 248         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 249
 250         tag = gtk_text_tag_new("preformatted");
 251         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 252
 253         tag = gtk_text_tag_new("header");
 254         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 255         g_hash_table_insert(default_text_grid_styles, "header", tag);
 256
 257         tag = gtk_text_tag_new("subheader");
 258         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 259         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 260
 261         tag = gtk_text_tag_new("alert");
 262         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 263         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 264
 265         tag = gtk_text_tag_new("note");
 266         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 267         g_hash_table_insert(default_text_grid_styles, "note", tag);
 268
 269         tag = gtk_text_tag_new("block-quote");
 270         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 271         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 272
 273         tag = gtk_text_tag_new("input");
 274         g_hash_table_insert(default_text_grid_styles, "input", tag);
 275
 276         tag = gtk_text_tag_new("user1");
 277         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 278
 279         tag = gtk_text_tag_new("user2");
 280         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 281
 282         tag = gtk_text_tag_new("hyperlink");
 283         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 284         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 285
 286         /* Initialise the default styles for a text buffer */
 287         tag = gtk_text_tag_new("default");
 288         g_object_set(tag, "family", "Serif", "family-set", TRUE, NULL);
 289         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 290
 291         tag = gtk_text_tag_new("normal");
 292         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 293
 294         tag = gtk_text_tag_new("emphasized");
 295         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 296         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 297
 298         tag = gtk_text_tag_new("preformatted");
 299         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 300         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 301
 302         tag = gtk_text_tag_new("header");
 303         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 304         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 305
 306         tag = gtk_text_tag_new("subheader");
 307         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 308         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 309
 310         tag = gtk_text_tag_new("alert");
 311         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 312         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 313
 314         tag = gtk_text_tag_new("note");
 315         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 316         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 317
 318         tag = gtk_text_tag_new("block-quote");
 319         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 320         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 321
 322         tag = gtk_text_tag_new("input");
 323         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 324
 325         tag = gtk_text_tag_new("user1");
 326         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 327
 328         tag = gtk_text_tag_new("user2");
 329         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 330
 331         tag = gtk_text_tag_new("hyperlink");
 332         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 333         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 334
 335         priv->styles->text_grid = default_text_grid_styles;
 336         priv->styles->text_buffer = default_text_buffer_styles;
 337
 338         /* Initialize the GLK styles to empty tags */
 339         int i;
 340         for(i=0; i<style_NUMSTYLES; i++) {
 341                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 342                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 343                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 344                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 345         }
 346
 347         priv->glk_styles->text_grid = glk_text_grid_styles;
 348         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 349
 350 }
 351
 352 /* Reset style tables to the library's internal defaults */
 353 void
 354 reset_default_styles(ChimaraGlk *glk)
 355 {
 356         /* TODO: write this function */
 357 }
 358
 359 /* Create the CSS file scanner */
 360 GScanner *
 361 create_css_file_scanner(void)
 362 {
 363         GScanner *scanner = g_scanner_new(NULL);
 364         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 365         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 366         scanner->config->symbol_2_token = TRUE;
 367         scanner->config->cpair_comment_single = NULL;
 368         scanner->config->scan_float = FALSE;
 369         return scanner;
 370 }
 371
 372 /* Run the scanner over the CSS file, overriding the default styles */
 373 void
 374 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 375 {
 376         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 377                 if( !style_accept_style_selector(scanner, glk) )
 378                         break;
 379         }
 380
 381         g_scanner_destroy(scanner);
 382 }
 383
 384 /* Internal function: parses a token */
 385 static gboolean
 386 style_accept(GScanner *scanner, GTokenType token)
 387 {
 388         GTokenType next = g_scanner_get_next_token(scanner);
 389         if(next != token) {
 390                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 391                 return FALSE;
 392         }
 393         return TRUE;
 394 }
 395
 396 /* Internal function: parses a style selector */
 397 static gboolean
 398 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 399 {
 400         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 401
 402         GtkTextTag *current_tag;
 403         gchar *field;
 404         GTokenType token = g_scanner_get_next_token(scanner);
 405         GTokenValue value = g_scanner_cur_value(scanner);
 406
 407         if(
 408                 token != G_TOKEN_IDENTIFIER ||
 409                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 410         ) {
 411                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 412                 return FALSE;
 413         }
 414
 415         field = g_strdup(value.v_identifier);
 416
 417         /* Parse the tag name to change */
 418         if( g_scanner_peek_next_token(scanner) == '{') {
 419                 style_accept(scanner, '{');
 420                 if( !strcmp(field, "buffer") )
 421                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 422                 else
 423                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 424         } else {
 425                 if( !style_accept(scanner, '.') )
 426                         return FALSE;
 427
 428                 token = g_scanner_get_next_token(scanner);
 429                 value = g_scanner_cur_value(scanner);
 430
 431                 if(token != G_TOKEN_IDENTIFIER) {
 432                         g_scanner_error(scanner, "CSS Error: style selector expected");
 433                         return FALSE;
 434                 }
 435
 436                 if( !strcmp(field, "buffer") )
 437                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 438                 else
 439                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 440
 441                 if(current_tag == NULL) {
 442                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 443                         return FALSE;
 444                 }
 445
 446                 if( !style_accept(scanner, '{') )
 447                         return FALSE;
 448         }
 449
 450         while( g_scanner_peek_next_token(scanner) != '}') {
 451                 if( !style_accept_style_hint(scanner, current_tag) )
 452                         return FALSE;
 453         }
 454
 455         if( !style_accept(scanner, '}') )
 456                 return FALSE;
 457
 458         return TRUE;
 459 }
 460
 461 /* Internal function: parses a style hint */
 462 static gboolean
 463 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 464 {
 465         GTokenType token = g_scanner_get_next_token(scanner);
 466         GTokenValue value = g_scanner_cur_value(scanner);
 467         gchar *hint;
 468
 469         if(token != G_TOKEN_IDENTIFIER) {
 470                 g_scanner_error(scanner, "CSS Error: style hint expected");
 471                 return FALSE;
 472         }
 473
 474         hint = g_strdup(value.v_identifier);
 475
 476         if( !style_accept(scanner, ':') )
 477                 return FALSE;
 478
 479         token = g_scanner_get_next_token(scanner);
 480         value = g_scanner_cur_value(scanner);
 481
 482         if( !strcmp(hint, "font-family") ) {
 483                 if(token != G_TOKEN_STRING) {
 484                         g_scanner_error(scanner, "CSS Error: string expected");
 485                         return FALSE;
 486                 }
 487                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 488         }
 489         else if( !strcmp(hint, "font-weight") ) {
 490                 if(token != G_TOKEN_IDENTIFIER) {
 491                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 492                         return FALSE;
 493                 }
 494
 495                 if( !strcmp(value.v_identifier, "bold") )
 496                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 497                 else if( !strcmp(value.v_identifier, "normal") )
 498                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 499                 else {
 500                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 501                         return FALSE;
 502                 }
 503         }
 504         else if( !strcmp(hint, "font-style") ) {
 505                 if(token != G_TOKEN_IDENTIFIER) {
 506                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 507                         return FALSE;
 508                 }
 509
 510                 if( !strcmp(value.v_identifier, "italic") )
 511                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 512                 else if( !strcmp(value.v_identifier, "normal") )
 513                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 514                 else {
 515                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 516                         return FALSE;
 517                 }
 518         }
 519         else if( !strcmp(hint, "font-size") ) {
 520                 if(token == G_TOKEN_INT)
 521                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 522                 else if(token == G_TOKEN_FLOAT)
 523                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 524                 else {
 525                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 526                         return FALSE;
 527                 }
 528         }
 529         else if( !strcmp(hint, "color") ) {
 530                 if(token != G_TOKEN_IDENTIFIER) {
 531                         g_scanner_error(scanner, "CSS Error: hex color expected");
 532                         return FALSE;
 533                 }
 534
 535                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 536         }
 537         else if( !strcmp(hint, "background-color") ) {
 538                 if(token != G_TOKEN_IDENTIFIER) {
 539                         g_scanner_error(scanner, "CSS Error: hex color expected");
 540                         return FALSE;
 541                 }
 542                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 543         }
 544         else if( !strcmp(hint, "text-align") ) {
 545                 if(token != G_TOKEN_IDENTIFIER) {
 546                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 547                         return FALSE;
 548                 }
 549
 550                 if( !strcmp(value.v_identifier, "left") )
 551                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 552                 else if( !strcmp(value.v_identifier, "right") )
 553                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 554                 else if( !strcmp(value.v_identifier, "center") )
 555                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 556                 else {
 557                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 558                         return FALSE;
 559                 }
 560         }
 561         else if( !strcmp(hint, "margin-left") ) {
 562                 if(token != G_TOKEN_INT) {
 563                         g_scanner_error(scanner, "CSS Error: integer expected");
 564                         return FALSE;
 565                 }
 566                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 567         }
 568         else if( !strcmp(hint, "margin-right") ) {
 569                 if(token != G_TOKEN_INT) {
 570                         g_scanner_error(scanner, "CSS Error: integer expected");
 571                         return FALSE;
 572                 }
 573                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 574         }
 575         else if( !strcmp(hint, "margin-top") ) {
 576                 if(token != G_TOKEN_INT) {
 577                         g_scanner_error(scanner, "CSS Error: integer expected");
 578                         return FALSE;
 579                 }
 580                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 581         }
 582         else if( !strcmp(hint, "margin-bottom") ) {
 583                 if(token != G_TOKEN_INT) {
 584                         g_scanner_error(scanner, "CSS Error: integer expected");
 585                         return FALSE;
 586                 }
 587                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 588         }
 589
 590         else {
 591                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 592                 return FALSE;
 593         }
 594
 595         if( !style_accept(scanner, ';') )
 596                 return FALSE;
 597
 598         return TRUE;
 599 }
 600
 601 /* Internal function: parses a glk color to a GdkColor */
 602 void
 603 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 604 {
 605         color->red = 256 * ((val & 0xff0000) >> 16);
 606         color->green = 256 * ((val & 0x00ff00) >> 8);
 607         color->blue = 256 * (val & 0x0000ff);
 608 }
 609
 610 /* Internal function: parses a glk color to a hex string */
 611 gchar*
 612 glkcolor_to_hex(glui32 val)
 613 {
 614         return g_strdup_printf("%04X%04X%04X",
 615                 256 * ((val & 0xff0000) >> 16),
 616                 256 * ((val & 0x00ff00) >> 8),
 617                 256 * (val & 0x0000ff)
 618         );
 619 }
 620
 621 /* Internal function: parses a gdk color to a hex string */
 622 gchar*
 623 gdkcolor_to_hex(GdkColor *color)
 624 {
 625         return g_strdup_printf("%04X%04X%04X",
 626                 color->red, color->green, color->blue
 627         );
 628 }
 629
 630 /* Internal function: parses a GdkColor to a glk color */
 631 static glui32
 632 gdkcolor_to_glkcolor(GdkColor *color)
 633 {
 634         g_return_val_if_fail(color != NULL, 0);
 635         return (glui32) color->pixel;
 636 }
 637
 638 /* Internal function: changes a GTK tag to correspond with the given style. */
 639 static void
 640 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 641 {
 642         g_return_if_fail(tag != NULL);
 643
 644         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 645         GObject *tag_object = G_OBJECT(tag);
 646
 647         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 648
 649         int i = 0;
 650         GdkColor color;
 651         switch(hint) {
 652         case stylehint_Indentation:
 653                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 654                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 655                 break;
 656
 657         case stylehint_ParaIndentation:
 658                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 659                 break;
 660
 661         case stylehint_Justification:
 662                 switch(val) {
 663                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 664                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 665                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 666                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 667                         default:
 668                                 WARNING("Unknown justification");
 669                                 i = GTK_JUSTIFY_LEFT;
 670                 }
 671                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 672                 break;
 673
 674         case stylehint_Weight:
 675                 switch(val) {
 676                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 677                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 678                         case  1: i = PANGO_WEIGHT_BOLD; break;
 679                         default: WARNING("Unknown font weight");
 680                 }
 681                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 682                 break;
 683
 684         case stylehint_Size:
 685                 {
 686                         gdouble scale = PANGO_SCALE_MEDIUM;
 687                         switch(val) {
 688                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 689                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 690                                 case -1: scale = PANGO_SCALE_SMALL; break;
 691                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 692                                 case  1: scale = PANGO_SCALE_LARGE; break;
 693                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 694                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 695                                 default:
 696                                         /* We follow Pango's convention of having each magnification
 697                                         step be a scaling of 1.2 */
 698                                         scale = pow(1.2, (double)val);
 699                         }
 700                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 701                 }
 702                 break;
 703
 704         case stylehint_Oblique:
 705                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 706                 break;
 707
 708         case stylehint_Proportional:
 709         {
 710                 gchar *font_family;
 711                 gboolean family_set;
 712
 713                 if(wintype != wintype_TextBuffer) {
 714                         if(val)
 715                                 WARNING("Style hint 'propotional' only supported on text buffers.");
 716
 717                         break;
 718                 }
 719
 720                 GtkTextTag *font_tag = g_hash_table_lookup(glk_data->styles->text_buffer, val? "default" : "preformatted");
 721                 g_object_get(font_tag, "family", &font_family, "family-set", &family_set, NULL);
 722                 g_object_set(tag_object, "family", font_family, "family-set", family_set, NULL);
 723                 g_free(font_family);
 724         }
 725                 break;
 726
 727         case stylehint_TextColor:
 728                 glkcolor_to_gdkcolor(val, &color);
 729
 730                 if(!reverse_color)
 731                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 732                 else
 733                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 734
 735                 break;
 736
 737         case stylehint_BackColor:
 738                 glkcolor_to_gdkcolor(val, &color);
 739
 740                 if(!reverse_color)
 741                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 742                 else
 743                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 744
 745                 break;
 746
 747         case stylehint_ReverseColor:
 748         {
 749                 // Determine the current colors
 750
 751                 // If all fails, use black/white
 752                 // FIXME: Use system theme here
 753                 GdkColor foreground, background;
 754                 gdk_color_parse("black", &foreground);
 755                 gdk_color_parse("white", &background);
 756                 GdkColor *current_foreground = &foreground;
 757                 GdkColor *current_background = &background;
 758
 759                 if(wintype == wintype_TextBuffer) {
 760                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 761                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 762                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 763                 }
 764                 else if(wintype == wintype_TextGrid) {
 765                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 766                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 767                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 768                 }
 769
 770                 if(val) {
 771                         /* Flip the fore- and background colors */
 772                         GdkColor *temp = current_foreground;
 773                         current_foreground = current_background;
 774                         current_background = temp;
 775                 }
 776
 777                 g_object_set(tag,
 778                         "foreground-gdk", current_foreground,
 779                         "foreground-set", TRUE,
 780                         "background-gdk", current_background,
 781                         "background-set", TRUE,
 782                         NULL
 783                 );
 784
 785                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 786                 break;
 787         }
 788
 789         default:
 790                 WARNING("Unknown style hint");
 791         }
 792 }
 793
 794 /* Internal function: queries a text tag for the value of a given style hint */
 795 static gint
 796 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 797 {
 798         gint intval;
 799         gdouble doubleval;
 800         GdkColor *colval;
 801
 802         g_return_val_if_fail(tag != NULL, 0);
 803
 804         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 805
 806         switch(hint) {
 807         case stylehint_Indentation:
 808                 g_object_get(tag, "left_margin", &intval, NULL);
 809                 return intval/5;
 810
 811         case stylehint_ParaIndentation:
 812                 g_object_get(tag, "indent", &intval, NULL);
 813                 return intval/5;
 814
 815         case stylehint_Justification:
 816                 g_object_get(tag, "justification", &intval, NULL);
 817                 switch(intval) {
 818                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 819                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 820                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 821                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 822                         default:
 823                                 WARNING("Unknown justification");
 824                                 return stylehint_just_LeftFlush;
 825                 }
 826
 827         case stylehint_Weight:
 828                 g_object_get(tag, "weight", &intval, NULL);
 829                 switch(intval) {
 830                         case PANGO_WEIGHT_LIGHT: return -1;
 831                         case PANGO_WEIGHT_NORMAL: return 0;
 832                         case PANGO_WEIGHT_BOLD: return 1;
 833                         default: WARNING("Unknown font weight"); return 0;
 834                 }
 835
 836         case stylehint_Size:
 837                 g_object_get(tag, "scale", &doubleval, NULL);
 838                 return (gint)round(log(doubleval) / log(1.2));
 839
 840         case stylehint_Oblique:
 841                 g_object_get(tag, "style", &intval , NULL);
 842                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 843
 844         case stylehint_Proportional:
 845                 /* Use pango_font_family_is_monospace()? */
 846         {
 847                 gchar *font_family, *query_font_family;
 848                 GtkTextTag *font_tag = g_hash_table_lookup(
 849                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 850                     "preformatted");
 851                 g_object_get(font_tag, "family", &font_family, NULL);
 852                 g_object_get(tag, "family", &query_font_family, NULL);
 853                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 854                 g_free(font_family);
 855                 g_free(query_font_family);
 856                 return retval;
 857         }
 858
 859         case stylehint_TextColor:
 860                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 861                 return gdkcolor_to_glkcolor(colval);
 862
 863         case stylehint_BackColor:
 864                 g_object_get(tag, "background-gdk", &colval, NULL);
 865                 return gdkcolor_to_glkcolor(colval);
 866
 867         case stylehint_ReverseColor:
 868                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 869
 870         default:
 871                 WARNING("Unknown style hint");
 872         }
 873
 874         return 0;
 875 }
 876
 877 /**
 878  * glk_stylehint_set:
 879  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 880  * @styl: The style to set a hint for.
 881  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 882  * @val: The style hint. The meaning of this depends on @hint.
 883  *
 884  * Sets a hint about the appearance of one style for a particular type of
 885  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 886  * all types of window.
 887  * <note><para>
 888  *  There is no equivalent constant to set a hint for all styles of a single
 889  *  window type.
 890  * </para></note>
 891  */
 892 void
 893 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 894 {
 895 #ifdef DEBUG_STYLES
 896         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 897 #endif
 898
 899         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 900
 901         GtkTextTag *to_change;
 902         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 903                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 904                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 905         }
 906
 907         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 908                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 909                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 910         }
 911 }
 912
 913 /**
 914  * glk_stylehint_clear:
 915  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 916  * @styl: The style to set a hint for.
 917  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 918  *
 919  * Clears a hint about the appearance of one style for a particular type of
 920  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 921  * which clears a hint for all types of window.
 922  * <note><para>
 923  *  There is no equivalent constant to reset a hint for all styles of a single
 924  *  window type.
 925  * </para></note>
 926  */
 927 void
 928 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 929 {
 930 #ifdef DEBUG_STYLES
 931         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 932 #endif
 933
 934         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 935         GtkTextTag *tag;
 936
 937         switch(wintype) {
 938         case wintype_TextBuffer:
 939                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 940                 if(tag) {
 941                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 942                 }
 943                 break;
 944         case wintype_TextGrid:
 945                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 946                 if(tag) {
 947                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 948                 }
 949         default:
 950                 return;
 951         }
 952 }
 953
 954 /**
 955  * glk_style_distinguish:
 956  * @win: The window in which the styles are to be distinguished.
 957  * @styl1: The first style to be distinguished from the second style.
 958  * @styl2: The second style to be distinguished from the first style.
 959  *
 960  * Decides whether two styles are visually distinguishable in the given window.
 961  * The exact meaning of this is left for the library to determine.
 962  * <note><title>Chimara</title><para>
 963  *   Currently, all styles of one window are assumed to be mutually
 964  *   distinguishable.
 965  * </para></note>
 966  *
 967  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 968  * are not, it returns %FALSE (0).
 969  */
 970 glui32
 971 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 972 {
 973 #ifdef DEBUG_STYLES
 974         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
 975 #endif
 976
 977         /* FIXME */
 978         return styl1 != styl2;
 979 }
 980
 981 /**
 982  * glk_style_measure:
 983  * @win: The window from which to take the style.
 984  * @styl: The style to perform the measurement on.
 985  * @hint: The stylehint to measure.
 986  * @result: Address to write the result to.
 987  *
 988  * Tries to test an attribute of one style in the given window @win. The library
 989  * may not be able to determine the attribute; if not, this returns %FALSE (0).
 990  * If it can, it returns %TRUE (1) and stores the value in the location pointed
 991  * at by @result.
 992  * <note><para>
 993  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
 994  * </para></note>
 995  *
 996  * The meaning of the value depends on the hint which was tested:
 997  * <variablelist>
 998  * <varlistentry>
 999  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1000  *   <listitem><para>The indentation and paragraph indentation. These are in a
1001  *   metric which is platform-dependent.</para>
1002  *   <note><para>Most likely either characters or pixels.</para></note>
1003  *   </listitem>
1004  * </varlistentry>
1005  * <varlistentry>
1006  *   <term>%stylehint_Justification</term>
1007  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1008  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1009  *   %stylehint_just_RightFlush.</para></listitem>
1010  * </varlistentry>
1011  * <varlistentry>
1012  *   <term>%stylehint_Size</term>
1013  *   <listitem><para>The font size. Again, this is in a platform-dependent
1014  *   metric.</para>
1015  *   <note><para>Pixels, points, or simply 1 if the library does not support
1016  *   varying font sizes.</para></note>
1017  *   </listitem>
1018  * </varlistentry>
1019  * <varlistentry>
1020  *   <term>%stylehint_Weight</term>
1021  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1022  *   and -1 for light-weight fonts.</para></listitem>
1023  * </varlistentry>
1024  * <varlistentry>
1025  *   <term>%stylehint_Oblique</term>
1026  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1027  *   </listitem>
1028  * </varlistentry>
1029  * <varlistentry>
1030  *   <term>%stylehint_Proportional</term>
1031  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1032  *   </para></listitem>
1033  * </varlistentry>
1034  * <varlistentry>
1035  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1036  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1037  *   described in <link
1038  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1039  *   Appearance of Styles</link>.</para></listitem>
1040  * </varlistentry>
1041  * <varlistentry>
1042  *   <term>%stylehint_ReverseColor</term>
1043  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1044  *   colors are reversed.</para></listitem>
1045  * </varlistentry>
1046  * </variablelist>
1047  * Signed values, such as the %stylehint_Weight value, are cast to
1048  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1049  * in a more natural context.
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 #ifdef DEBUG_STYLES
1057         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1058 #endif
1059
1060         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
1061         GtkTextTag *tag;
1062
1063         switch(win->type) {
1064         case wintype_TextBuffer:
1065                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1066                 if(result)
1067                         *result = query_tag(tag, win->type, hint);
1068                 break;
1069         case wintype_TextGrid:
1070                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1071                 if(result)
1072                         *result = query_tag(tag, win->type, hint);
1073         default:
1074                 return FALSE;
1075         }
1076
1077         return TRUE;
1078 }
1079
1080 /* Internal function returning the current default font for a window type
1081  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1082  * supported for now */
1083 PangoFontDescription *
1084 get_current_font(guint32 wintype)
1085 {
1086         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
1087         GHashTable *styles, *glk_styles;
1088         PangoFontDescription *font;
1089
1090         switch(wintype) {
1091         case wintype_TextGrid:
1092                 styles = glk_data->styles->text_grid;
1093                 glk_styles = glk_data->glk_styles->text_grid;
1094                 font = pango_font_description_from_string("Monospace");
1095                 break;
1096         case wintype_TextBuffer:
1097                 styles = glk_data->styles->text_buffer;
1098                 glk_styles = glk_data->glk_styles->text_buffer;
1099                 font = pango_font_description_from_string("Serif");
1100                 break;
1101         default:
1102                 return NULL;
1103         }
1104
1105         PangoAttrList *list = pango_attr_list_new();
1106
1107         text_tag_to_attr_list( g_hash_table_lookup(styles, "default"), list );
1108         PangoAttrIterator *it = pango_attr_list_get_iterator(list);
1109         pango_attr_iterator_get_font(it, font, NULL, NULL);
1110         pango_attr_iterator_destroy(it);
1111
1112         text_tag_to_attr_list( g_hash_table_lookup(styles, "normal"), list );
1113         it = pango_attr_list_get_iterator(list);
1114         pango_attr_iterator_get_font(it, font, NULL, NULL);
1115         pango_attr_iterator_destroy(it);
1116
1117         text_tag_to_attr_list( g_hash_table_lookup(glk_styles, "glk-normal"), list );
1118         it = pango_attr_list_get_iterator(list);
1119         pango_attr_iterator_get_font(it, font, NULL, NULL);
1120         pango_attr_iterator_destroy(it);
1121
1122         /* Make a copy of the family, preventing it's destruction at the end of this function. */
1123         pango_font_description_set_family( font, pango_font_description_get_family(font) );
1124
1125         pango_attr_list_unref(list);
1126
1127         return font;
1128 }
1129
1130 /* Internal function copying the attributes of a text tag to a pango attribute list */
1131 static void
1132 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1133 {
1134         gboolean set;
1135         GdkColor *foreground, *background;
1136         gchar *string;
1137         PangoFontDescription *font_desc;
1138         gboolean strikethrough;
1139         PangoUnderline underline;
1140
1141         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1142         if(set) {
1143                 pango_attr_list_insert(
1144                         list,
1145                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1146                 );
1147         }
1148         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1149         if(set) {
1150                 pango_attr_list_insert(
1151                         list,
1152                         pango_attr_background_new(background->red, background->green, background->blue)
1153                 );
1154         }
1155         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1156         if(set) {
1157                 pango_attr_list_insert(
1158                         list,
1159                         pango_attr_language_new( pango_language_from_string(string) )
1160                 );
1161         }
1162
1163         /* Font description updates the following properties simultaniously:
1164          * family, style, weight, variant, stretch, size.
1165          * FIXME: Except it doesn't really.
1166          */
1167         g_object_get(tag, "font-desc", &font_desc, NULL);
1168         pango_attr_list_insert(
1169                 list,
1170                 pango_attr_font_desc_new(font_desc)
1171         );
1172
1173         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1174         if(set) {
1175                 pango_attr_list_insert(
1176                         list,
1177                         pango_attr_strikethrough_new(strikethrough)
1178                 );
1179         }
1180         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1181         if(set) {
1182                 pango_attr_list_insert(
1183                         list,
1184                         pango_attr_underline_new(underline)
1185                 );
1186         }
1187 }
1188
1189 /* Determine the current colors used to render the text for a given stream.
1190  * This can be set in a number of places */
1191 static void
1192 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1193 {
1194         gboolean foreground_set = FALSE;
1195         gboolean background_set = FALSE;
1196         gint reverse_color;
1197
1198         // Default color
1199         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1200         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1201         if(foreground_set)
1202                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1203         if(background_set)
1204                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1205
1206         // Player defined color
1207         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1208         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1209         if(foreground_set)
1210                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1211         if(background_set)
1212                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1213
1214         // GLK defined color
1215         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1216         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1217         if(foreground_set)
1218                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1219         if(background_set)
1220                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1221
1222 }
1223
1224 /* Determine the current colors used to render the text for a given stream.
1225  * This can be set in a number of places */
1226 void
1227 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1228 {
1229         VALID_STREAM(str, return);
1230         g_return_if_fail(str->window != NULL);
1231         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1232
1233         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1234         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1235         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1236         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1237         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1238
1239         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1240
1241         gboolean foreground_set, background_set;
1242
1243         // Windows can have zcolors defined
1244         if(str->window->zcolor) {
1245                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1246                 if(foreground_set)
1247                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1248                 if(background_set)
1249                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1250         }
1251 }
1252
1253 /* Apply styles to a segment of text in a GtkTextBuffer, combining multiple
1254  * GtkTextTags.
1255  */
1256 void
1257 style_apply(winid_t win, GtkTextIter *start, GtkTextIter *end)
1258 {
1259         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
1260         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1261
1262         GtkTextTag *default_tag = gtk_text_tag_table_lookup(tags, "default");
1263         GtkTextTag *style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->style);
1264         GtkTextTag *glk_style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->glk_style);
1265
1266         // Player's style overrides
1267         gtk_text_buffer_apply_tag(buffer, style_tag, start, end);
1268
1269         // GLK Program's style overrides
1270         gtk_text_buffer_apply_tag(buffer, glk_style_tag, start, end);
1271
1272         // Default style
1273         gtk_text_buffer_apply_tag(buffer, default_tag, start, end);
1274
1275         // Link style overrides
1276         if(win->window_stream->hyperlink_mode) {
1277                 GtkTextTag *link_style_tag = gtk_text_tag_table_lookup(tags, "hyperlink");
1278                 GtkTextTag *link_tag = win->current_hyperlink->tag;
1279                 gtk_text_buffer_apply_tag(buffer, link_style_tag, start, end);
1280                 gtk_text_buffer_apply_tag(buffer, link_tag, start, end);
1281         }
1282
1283         // GLK Program's style overrides using garglk_set_zcolors()
1284         if(win->zcolor != NULL) {
1285                 gtk_text_buffer_apply_tag(buffer, win->zcolor, start, end);
1286         }
1287
1288         // GLK Program's style overrides using garglk_set_reversevideo()
1289         if(win->zcolor_reversed != NULL) {
1290                 gtk_text_buffer_apply_tag(buffer, win->zcolor_reversed, start, end);
1291         }
1292 }
1293