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         GtkTextTag *tag;
 235
 236         /* Initialise the default styles for a text grid */
 237         tag = gtk_text_tag_new("default");
 238         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 239         g_hash_table_insert(default_text_grid_styles, "default", tag);
 240
 241         tag = gtk_text_tag_new("normal");
 242         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 243
 244         tag = gtk_text_tag_new("emphasized");
 245         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 246         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 247
 248         tag = gtk_text_tag_new("preformatted");
 249         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 250
 251         tag = gtk_text_tag_new("header");
 252         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 253         g_hash_table_insert(default_text_grid_styles, "header", tag);
 254
 255         tag = gtk_text_tag_new("subheader");
 256         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 257         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 258
 259         tag = gtk_text_tag_new("alert");
 260         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 261         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 262
 263         tag = gtk_text_tag_new("note");
 264         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 265         g_hash_table_insert(default_text_grid_styles, "note", tag);
 266
 267         tag = gtk_text_tag_new("block-quote");
 268         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 269         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 270
 271         tag = gtk_text_tag_new("input");
 272         g_hash_table_insert(default_text_grid_styles, "input", tag);
 273
 274         tag = gtk_text_tag_new("user1");
 275         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 276
 277         tag = gtk_text_tag_new("user2");
 278         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 279
 280         tag = gtk_text_tag_new("hyperlink");
 281         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 282         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 283
 284         /* Initialise the default styles for a text buffer */
 285         tag = gtk_text_tag_new("default");
 286         g_object_set(tag, "family", "Serif", "family-set", TRUE, NULL);
 287         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 288
 289         tag = gtk_text_tag_new("normal");
 290         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 291
 292         tag = gtk_text_tag_new("emphasized");
 293         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 294         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 295
 296         tag = gtk_text_tag_new("preformatted");
 297         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 298         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 299
 300         tag = gtk_text_tag_new("header");
 301         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 302         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 303
 304         tag = gtk_text_tag_new("subheader");
 305         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 306         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 307
 308         tag = gtk_text_tag_new("alert");
 309         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 310         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 311
 312         tag = gtk_text_tag_new("note");
 313         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 314         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 315
 316         tag = gtk_text_tag_new("block-quote");
 317         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 318         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 319
 320         tag = gtk_text_tag_new("input");
 321         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 322
 323         tag = gtk_text_tag_new("user1");
 324         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 325
 326         tag = gtk_text_tag_new("user2");
 327         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 328
 329         tag = gtk_text_tag_new("hyperlink");
 330         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 331         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 332
 333         priv->styles->text_grid = default_text_grid_styles;
 334         priv->styles->text_buffer = default_text_buffer_styles;
 335
 336         style_reset_glk(glk);
 337 }
 338
 339 /* Reset the style hints set from the Glk program to be blank. Call this when
 340 starting a new game so that style hints from the previous game don't carry
 341 over. */
 342 void
 343 style_reset_glk(ChimaraGlk *glk)
 344 {
 345         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 346
 347         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 348         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 349         GtkTextTag *tag;
 350
 351         /* Initialize the GLK styles to empty tags */
 352         int i;
 353         for(i=0; i<style_NUMSTYLES; i++) {
 354                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 355                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 356                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 357                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 358         }
 359
 360         priv->glk_styles->text_grid = glk_text_grid_styles;
 361         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 362
 363 }
 364
 365 /* Reset style tables to the library's internal defaults */
 366 void
 367 reset_default_styles(ChimaraGlk *glk)
 368 {
 369         /* TODO: write this function */
 370 }
 371
 372 /* Create the CSS file scanner */
 373 GScanner *
 374 create_css_file_scanner(void)
 375 {
 376         GScanner *scanner = g_scanner_new(NULL);
 377         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 378         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 379         scanner->config->symbol_2_token = TRUE;
 380         scanner->config->cpair_comment_single = NULL;
 381         scanner->config->scan_float = FALSE;
 382         return scanner;
 383 }
 384
 385 /* Run the scanner over the CSS file, overriding the default styles */
 386 void
 387 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 388 {
 389         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 390                 if( !style_accept_style_selector(scanner, glk) )
 391                         break;
 392         }
 393
 394         g_scanner_destroy(scanner);
 395 }
 396
 397 /* Internal function: parses a token */
 398 static gboolean
 399 style_accept(GScanner *scanner, GTokenType token)
 400 {
 401         GTokenType next = g_scanner_get_next_token(scanner);
 402         if(next != token) {
 403                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 404                 return FALSE;
 405         }
 406         return TRUE;
 407 }
 408
 409 /* Internal function: parses a style selector */
 410 static gboolean
 411 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 412 {
 413         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 414
 415         GtkTextTag *current_tag;
 416         gchar *field;
 417         GTokenType token = g_scanner_get_next_token(scanner);
 418         GTokenValue value = g_scanner_cur_value(scanner);
 419
 420         if(
 421                 token != G_TOKEN_IDENTIFIER ||
 422                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 423         ) {
 424                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 425                 return FALSE;
 426         }
 427
 428         field = g_strdup(value.v_identifier);
 429
 430         /* Parse the tag name to change */
 431         if( g_scanner_peek_next_token(scanner) == '{') {
 432                 style_accept(scanner, '{');
 433                 if( !strcmp(field, "buffer") )
 434                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 435                 else
 436                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 437         } else {
 438                 if( !style_accept(scanner, '.') )
 439                         return FALSE;
 440
 441                 token = g_scanner_get_next_token(scanner);
 442                 value = g_scanner_cur_value(scanner);
 443
 444                 if(token != G_TOKEN_IDENTIFIER) {
 445                         g_scanner_error(scanner, "CSS Error: style selector expected");
 446                         return FALSE;
 447                 }
 448
 449                 if( !strcmp(field, "buffer") )
 450                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 451                 else
 452                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 453
 454                 if(current_tag == NULL) {
 455                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 456                         return FALSE;
 457                 }
 458
 459                 if( !style_accept(scanner, '{') )
 460                         return FALSE;
 461         }
 462
 463         while( g_scanner_peek_next_token(scanner) != '}') {
 464                 if( !style_accept_style_hint(scanner, current_tag) )
 465                         return FALSE;
 466         }
 467
 468         if( !style_accept(scanner, '}') )
 469                 return FALSE;
 470
 471         return TRUE;
 472 }
 473
 474 /* Internal function: parses a style hint */
 475 static gboolean
 476 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 477 {
 478         GTokenType token = g_scanner_get_next_token(scanner);
 479         GTokenValue value = g_scanner_cur_value(scanner);
 480         gchar *hint;
 481
 482         if(token != G_TOKEN_IDENTIFIER) {
 483                 g_scanner_error(scanner, "CSS Error: style hint expected");
 484                 return FALSE;
 485         }
 486
 487         hint = g_strdup(value.v_identifier);
 488
 489         if( !style_accept(scanner, ':') )
 490                 return FALSE;
 491
 492         token = g_scanner_get_next_token(scanner);
 493         value = g_scanner_cur_value(scanner);
 494
 495         if( !strcmp(hint, "font-family") ) {
 496                 if(token != G_TOKEN_STRING) {
 497                         g_scanner_error(scanner, "CSS Error: string expected");
 498                         return FALSE;
 499                 }
 500                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 501         }
 502         else if( !strcmp(hint, "font-weight") ) {
 503                 if(token != G_TOKEN_IDENTIFIER) {
 504                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 505                         return FALSE;
 506                 }
 507
 508                 if( !strcmp(value.v_identifier, "bold") )
 509                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 510                 else if( !strcmp(value.v_identifier, "normal") )
 511                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 512                 else {
 513                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 514                         return FALSE;
 515                 }
 516         }
 517         else if( !strcmp(hint, "font-style") ) {
 518                 if(token != G_TOKEN_IDENTIFIER) {
 519                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 520                         return FALSE;
 521                 }
 522
 523                 if( !strcmp(value.v_identifier, "italic") )
 524                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 525                 else if( !strcmp(value.v_identifier, "normal") )
 526                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 527                 else {
 528                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 529                         return FALSE;
 530                 }
 531         }
 532         else if( !strcmp(hint, "font-size") ) {
 533                 if(token == G_TOKEN_INT)
 534                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 535                 else if(token == G_TOKEN_FLOAT)
 536                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 537                 else {
 538                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 539                         return FALSE;
 540                 }
 541         }
 542         else if( !strcmp(hint, "color") ) {
 543                 if(token != G_TOKEN_IDENTIFIER) {
 544                         g_scanner_error(scanner, "CSS Error: hex color expected");
 545                         return FALSE;
 546                 }
 547
 548                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 549         }
 550         else if( !strcmp(hint, "background-color") ) {
 551                 if(token != G_TOKEN_IDENTIFIER) {
 552                         g_scanner_error(scanner, "CSS Error: hex color expected");
 553                         return FALSE;
 554                 }
 555                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 556         }
 557         else if( !strcmp(hint, "text-align") ) {
 558                 if(token != G_TOKEN_IDENTIFIER) {
 559                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 560                         return FALSE;
 561                 }
 562
 563                 if( !strcmp(value.v_identifier, "left") )
 564                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 565                 else if( !strcmp(value.v_identifier, "right") )
 566                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 567                 else if( !strcmp(value.v_identifier, "center") )
 568                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 569                 else {
 570                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 571                         return FALSE;
 572                 }
 573         }
 574         else if( !strcmp(hint, "margin-left") ) {
 575                 if(token != G_TOKEN_INT) {
 576                         g_scanner_error(scanner, "CSS Error: integer expected");
 577                         return FALSE;
 578                 }
 579                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 580         }
 581         else if( !strcmp(hint, "margin-right") ) {
 582                 if(token != G_TOKEN_INT) {
 583                         g_scanner_error(scanner, "CSS Error: integer expected");
 584                         return FALSE;
 585                 }
 586                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 587         }
 588         else if( !strcmp(hint, "margin-top") ) {
 589                 if(token != G_TOKEN_INT) {
 590                         g_scanner_error(scanner, "CSS Error: integer expected");
 591                         return FALSE;
 592                 }
 593                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 594         }
 595         else if( !strcmp(hint, "margin-bottom") ) {
 596                 if(token != G_TOKEN_INT) {
 597                         g_scanner_error(scanner, "CSS Error: integer expected");
 598                         return FALSE;
 599                 }
 600                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 601         }
 602
 603         else {
 604                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 605                 return FALSE;
 606         }
 607
 608         if( !style_accept(scanner, ';') )
 609                 return FALSE;
 610
 611         return TRUE;
 612 }
 613
 614 /* Internal function: parses a glk color to a GdkColor */
 615 void
 616 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 617 {
 618         color->red = 256 * ((val & 0xff0000) >> 16);
 619         color->green = 256 * ((val & 0x00ff00) >> 8);
 620         color->blue = 256 * (val & 0x0000ff);
 621 }
 622
 623 /* Internal function: parses a glk color to a hex string */
 624 gchar*
 625 glkcolor_to_hex(glui32 val)
 626 {
 627         return g_strdup_printf("%04X%04X%04X",
 628                 256 * ((val & 0xff0000) >> 16),
 629                 256 * ((val & 0x00ff00) >> 8),
 630                 256 * (val & 0x0000ff)
 631         );
 632 }
 633
 634 /* Internal function: parses a gdk color to a hex string */
 635 gchar*
 636 gdkcolor_to_hex(GdkColor *color)
 637 {
 638         return g_strdup_printf("%04X%04X%04X",
 639                 color->red, color->green, color->blue
 640         );
 641 }
 642
 643 /* Internal function: parses a GdkColor to a glk color */
 644 static glui32
 645 gdkcolor_to_glkcolor(GdkColor *color)
 646 {
 647         g_return_val_if_fail(color != NULL, 0);
 648         return (glui32) color->pixel;
 649 }
 650
 651 /* Internal function: changes a GTK tag to correspond with the given style. */
 652 static void
 653 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 654 {
 655         g_return_if_fail(tag != NULL);
 656
 657         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 658         GObject *tag_object = G_OBJECT(tag);
 659
 660         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 661
 662         int i = 0;
 663         GdkColor color;
 664         switch(hint) {
 665         case stylehint_Indentation:
 666                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 667                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 668                 break;
 669
 670         case stylehint_ParaIndentation:
 671                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 672                 break;
 673
 674         case stylehint_Justification:
 675                 switch(val) {
 676                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 677                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 678                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 679                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 680                         default:
 681                                 WARNING("Unknown justification");
 682                                 i = GTK_JUSTIFY_LEFT;
 683                 }
 684                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 685                 break;
 686
 687         case stylehint_Weight:
 688                 switch(val) {
 689                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 690                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 691                         case  1: i = PANGO_WEIGHT_BOLD; break;
 692                         default: WARNING("Unknown font weight");
 693                 }
 694                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 695                 break;
 696
 697         case stylehint_Size:
 698                 {
 699                         gdouble scale = PANGO_SCALE_MEDIUM;
 700                         switch(val) {
 701                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 702                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 703                                 case -1: scale = PANGO_SCALE_SMALL; break;
 704                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 705                                 case  1: scale = PANGO_SCALE_LARGE; break;
 706                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 707                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 708                                 default:
 709                                         /* We follow Pango's convention of having each magnification
 710                                         step be a scaling of 1.2 */
 711                                         scale = pow(1.2, (double)val);
 712                         }
 713                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 714                 }
 715                 break;
 716
 717         case stylehint_Oblique:
 718                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 719                 break;
 720
 721         case stylehint_Proportional:
 722         {
 723                 gchar *font_family;
 724                 gboolean family_set;
 725
 726                 if(wintype != wintype_TextBuffer) {
 727                         if(val)
 728                                 WARNING("Style hint 'propotional' only supported on text buffers.");
 729
 730                         break;
 731                 }
 732
 733                 GtkTextTag *font_tag = g_hash_table_lookup(glk_data->styles->text_buffer, val? "default" : "preformatted");
 734                 g_object_get(font_tag, "family", &font_family, "family-set", &family_set, NULL);
 735                 g_object_set(tag_object, "family", font_family, "family-set", family_set, NULL);
 736                 g_free(font_family);
 737         }
 738                 break;
 739
 740         case stylehint_TextColor:
 741                 glkcolor_to_gdkcolor(val, &color);
 742
 743                 if(!reverse_color)
 744                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 745                 else
 746                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 747
 748                 break;
 749
 750         case stylehint_BackColor:
 751                 glkcolor_to_gdkcolor(val, &color);
 752
 753                 if(!reverse_color)
 754                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 755                 else
 756                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 757
 758                 break;
 759
 760         case stylehint_ReverseColor:
 761         {
 762                 // Determine the current colors
 763
 764                 // If all fails, use black/white
 765                 // FIXME: Use system theme here
 766                 GdkColor foreground, background;
 767                 gdk_color_parse("black", &foreground);
 768                 gdk_color_parse("white", &background);
 769                 GdkColor *current_foreground = &foreground;
 770                 GdkColor *current_background = &background;
 771
 772                 if(wintype == wintype_TextBuffer) {
 773                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 774                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 775                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 776                 }
 777                 else if(wintype == wintype_TextGrid) {
 778                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 779                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 780                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 781                 }
 782
 783                 if(val) {
 784                         /* Flip the fore- and background colors */
 785                         GdkColor *temp = current_foreground;
 786                         current_foreground = current_background;
 787                         current_background = temp;
 788                 }
 789
 790                 g_object_set(tag,
 791                         "foreground-gdk", current_foreground,
 792                         "foreground-set", TRUE,
 793                         "background-gdk", current_background,
 794                         "background-set", TRUE,
 795                         NULL
 796                 );
 797
 798                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 799                 break;
 800         }
 801
 802         default:
 803                 WARNING("Unknown style hint");
 804         }
 805 }
 806
 807 /* Internal function: queries a text tag for the value of a given style hint */
 808 static gint
 809 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 810 {
 811         gint intval;
 812         gdouble doubleval;
 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, "scale", &doubleval, NULL);
 851                 return (gint)round(log(doubleval) / log(1.2));
 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 #ifdef DEBUG_STYLES
 909         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 910 #endif
 911
 912         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 913
 914         GtkTextTag *to_change;
 915         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 916                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 917                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 918         }
 919
 920         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 921                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 922                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 923         }
 924 }
 925
 926 /**
 927  * glk_stylehint_clear:
 928  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 929  * @styl: The style to set a hint for.
 930  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 931  *
 932  * Clears a hint about the appearance of one style for a particular type of
 933  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 934  * which clears a hint for all types of window.
 935  * <note><para>
 936  *  There is no equivalent constant to reset a hint for all styles of a single
 937  *  window type.
 938  * </para></note>
 939  */
 940 void
 941 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 942 {
 943 #ifdef DEBUG_STYLES
 944         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 945 #endif
 946
 947         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 948         GtkTextTag *tag;
 949
 950         switch(wintype) {
 951         case wintype_TextBuffer:
 952                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 953                 if(tag) {
 954                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 955                 }
 956                 break;
 957         case wintype_TextGrid:
 958                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 959                 if(tag) {
 960                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 961                 }
 962         default:
 963                 return;
 964         }
 965 }
 966
 967 /**
 968  * glk_style_distinguish:
 969  * @win: The window in which the styles are to be distinguished.
 970  * @styl1: The first style to be distinguished from the second style.
 971  * @styl2: The second style to be distinguished from the first style.
 972  *
 973  * Decides whether two styles are visually distinguishable in the given window.
 974  * The exact meaning of this is left for the library to determine.
 975  * <note><title>Chimara</title><para>
 976  *   Currently, all styles of one window are assumed to be mutually
 977  *   distinguishable.
 978  * </para></note>
 979  *
 980  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 981  * are not, it returns %FALSE (0).
 982  */
 983 glui32
 984 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 985 {
 986 #ifdef DEBUG_STYLES
 987         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
 988 #endif
 989
 990         /* FIXME */
 991         return styl1 != styl2;
 992 }
 993
 994 /**
 995  * glk_style_measure:
 996  * @win: The window from which to take the style.
 997  * @styl: The style to perform the measurement on.
 998  * @hint: The stylehint to measure.
 999  * @result: Address to write the result to.
1000  *
1001  * Tries to test an attribute of one style in the given window @win. The library
1002  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1003  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1004  * at by @result.
1005  * <note><para>
1006  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1007  * </para></note>
1008  *
1009  * The meaning of the value depends on the hint which was tested:
1010  * <variablelist>
1011  * <varlistentry>
1012  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1013  *   <listitem><para>The indentation and paragraph indentation. These are in a
1014  *   metric which is platform-dependent.</para>
1015  *   <note><para>Most likely either characters or pixels.</para></note>
1016  *   </listitem>
1017  * </varlistentry>
1018  * <varlistentry>
1019  *   <term>%stylehint_Justification</term>
1020  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1021  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1022  *   %stylehint_just_RightFlush.</para></listitem>
1023  * </varlistentry>
1024  * <varlistentry>
1025  *   <term>%stylehint_Size</term>
1026  *   <listitem><para>The font size. Again, this is in a platform-dependent
1027  *   metric.</para>
1028  *   <note><para>Pixels, points, or simply 1 if the library does not support
1029  *   varying font sizes.</para></note>
1030  *   </listitem>
1031  * </varlistentry>
1032  * <varlistentry>
1033  *   <term>%stylehint_Weight</term>
1034  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1035  *   and -1 for light-weight fonts.</para></listitem>
1036  * </varlistentry>
1037  * <varlistentry>
1038  *   <term>%stylehint_Oblique</term>
1039  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1040  *   </listitem>
1041  * </varlistentry>
1042  * <varlistentry>
1043  *   <term>%stylehint_Proportional</term>
1044  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1045  *   </para></listitem>
1046  * </varlistentry>
1047  * <varlistentry>
1048  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1049  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1050  *   described in <link
1051  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1052  *   Appearance of Styles</link>.</para></listitem>
1053  * </varlistentry>
1054  * <varlistentry>
1055  *   <term>%stylehint_ReverseColor</term>
1056  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1057  *   colors are reversed.</para></listitem>
1058  * </varlistentry>
1059  * </variablelist>
1060  * Signed values, such as the %stylehint_Weight value, are cast to
1061  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1062  * in a more natural context.
1063  *
1064  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1065  */
1066 glui32
1067 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1068 {
1069 #ifdef DEBUG_STYLES
1070         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1071 #endif
1072
1073         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
1074         GtkTextTag *tag;
1075
1076         switch(win->type) {
1077         case wintype_TextBuffer:
1078                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1079                 if(result)
1080                         *result = query_tag(tag, win->type, hint);
1081                 break;
1082         case wintype_TextGrid:
1083                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1084                 if(result)
1085                         *result = query_tag(tag, win->type, hint);
1086         default:
1087                 return FALSE;
1088         }
1089
1090         return TRUE;
1091 }
1092
1093 /* Internal function returning the current default font for a window type
1094  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1095  * supported for now */
1096 PangoFontDescription *
1097 get_current_font(guint32 wintype)
1098 {
1099         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
1100         GHashTable *styles, *glk_styles;
1101         PangoFontDescription *font;
1102
1103         switch(wintype) {
1104         case wintype_TextGrid:
1105                 styles = glk_data->styles->text_grid;
1106                 glk_styles = glk_data->glk_styles->text_grid;
1107                 font = pango_font_description_from_string("Monospace");
1108                 break;
1109         case wintype_TextBuffer:
1110                 styles = glk_data->styles->text_buffer;
1111                 glk_styles = glk_data->glk_styles->text_buffer;
1112                 font = pango_font_description_from_string("Serif");
1113                 break;
1114         default:
1115                 return NULL;
1116         }
1117
1118         PangoAttrList *list = pango_attr_list_new();
1119
1120         text_tag_to_attr_list( g_hash_table_lookup(styles, "default"), list );
1121         PangoAttrIterator *it = pango_attr_list_get_iterator(list);
1122         pango_attr_iterator_get_font(it, font, NULL, NULL);
1123         pango_attr_iterator_destroy(it);
1124
1125         text_tag_to_attr_list( g_hash_table_lookup(styles, "normal"), list );
1126         it = pango_attr_list_get_iterator(list);
1127         pango_attr_iterator_get_font(it, font, NULL, NULL);
1128         pango_attr_iterator_destroy(it);
1129
1130         text_tag_to_attr_list( g_hash_table_lookup(glk_styles, "glk-normal"), list );
1131         it = pango_attr_list_get_iterator(list);
1132         pango_attr_iterator_get_font(it, font, NULL, NULL);
1133         pango_attr_iterator_destroy(it);
1134
1135         /* Make a copy of the family, preventing it's destruction at the end of this function. */
1136         pango_font_description_set_family( font, pango_font_description_get_family(font) );
1137
1138         pango_attr_list_unref(list);
1139
1140         return font;
1141 }
1142
1143 /* Internal function copying the attributes of a text tag to a pango attribute list */
1144 static void
1145 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1146 {
1147         gboolean set;
1148         GdkColor *foreground, *background;
1149         gchar *string;
1150         PangoFontDescription *font_desc;
1151         gboolean strikethrough;
1152         PangoUnderline underline;
1153
1154         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1155         if(set) {
1156                 pango_attr_list_insert(
1157                         list,
1158                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1159                 );
1160         }
1161         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1162         if(set) {
1163                 pango_attr_list_insert(
1164                         list,
1165                         pango_attr_background_new(background->red, background->green, background->blue)
1166                 );
1167         }
1168         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1169         if(set) {
1170                 pango_attr_list_insert(
1171                         list,
1172                         pango_attr_language_new( pango_language_from_string(string) )
1173                 );
1174         }
1175
1176         /* Font description updates the following properties simultaniously:
1177          * family, style, weight, variant, stretch, size.
1178          * FIXME: Except it doesn't really.
1179          */
1180         g_object_get(tag, "font-desc", &font_desc, NULL);
1181         pango_attr_list_insert(
1182                 list,
1183                 pango_attr_font_desc_new(font_desc)
1184         );
1185
1186         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1187         if(set) {
1188                 pango_attr_list_insert(
1189                         list,
1190                         pango_attr_strikethrough_new(strikethrough)
1191                 );
1192         }
1193         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1194         if(set) {
1195                 pango_attr_list_insert(
1196                         list,
1197                         pango_attr_underline_new(underline)
1198                 );
1199         }
1200 }
1201
1202 /* Determine the current colors used to render the text for a given stream.
1203  * This can be set in a number of places */
1204 static void
1205 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1206 {
1207         gboolean foreground_set = FALSE;
1208         gboolean background_set = FALSE;
1209         gint reverse_color;
1210
1211         // Default color
1212         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1213         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1214         if(foreground_set)
1215                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1216         if(background_set)
1217                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1218
1219         // Player defined color
1220         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1221         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1222         if(foreground_set)
1223                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1224         if(background_set)
1225                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1226
1227         // GLK defined color
1228         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1229         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1230         if(foreground_set)
1231                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1232         if(background_set)
1233                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1234
1235 }
1236
1237 /* Determine the current colors used to render the text for a given stream.
1238  * This can be set in a number of places */
1239 void
1240 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1241 {
1242         VALID_STREAM(str, return);
1243         g_return_if_fail(str->window != NULL);
1244         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1245
1246         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1247         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1248         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1249         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1250         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1251
1252         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1253
1254         gboolean foreground_set, background_set;
1255
1256         // Windows can have zcolors defined
1257         if(str->window->zcolor) {
1258                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1259                 if(foreground_set)
1260                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1261                 if(background_set)
1262                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1263         }
1264 }
1265
1266 /* Apply styles to a segment of text in a GtkTextBuffer, combining multiple
1267  * GtkTextTags.
1268  */
1269 void
1270 style_apply(winid_t win, GtkTextIter *start, GtkTextIter *end)
1271 {
1272         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
1273         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1274
1275         GtkTextTag *default_tag = gtk_text_tag_table_lookup(tags, "default");
1276         GtkTextTag *style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->style);
1277         GtkTextTag *glk_style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->glk_style);
1278
1279         // Player's style overrides
1280         gtk_text_buffer_apply_tag(buffer, style_tag, start, end);
1281
1282         // GLK Program's style overrides
1283         gtk_text_buffer_apply_tag(buffer, glk_style_tag, start, end);
1284
1285         // Default style
1286         gtk_text_buffer_apply_tag(buffer, default_tag, start, end);
1287
1288         // Link style overrides
1289         if(win->window_stream->hyperlink_mode) {
1290                 GtkTextTag *link_style_tag = gtk_text_tag_table_lookup(tags, "hyperlink");
1291                 GtkTextTag *link_tag = win->current_hyperlink->tag;
1292                 gtk_text_buffer_apply_tag(buffer, link_style_tag, start, end);
1293                 gtk_text_buffer_apply_tag(buffer, link_tag, start, end);
1294         }
1295
1296         // GLK Program's style overrides using garglk_set_zcolors()
1297         if(win->zcolor != NULL) {
1298                 gtk_text_buffer_apply_tag(buffer, win->zcolor, start, end);
1299         }
1300
1301         // GLK Program's style overrides using garglk_set_reversevideo()
1302         if(win->zcolor_reversed != NULL) {
1303                 gtk_text_buffer_apply_tag(buffer, win->zcolor_reversed, start, end);
1304         }
1305 }
1306