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         "pager",
  57         "default"
  58 };
  59
  60 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
  61 static const gchar* GLK_TAG_NAMES[] = {
  62         "glk-normal",
  63         "glk-emphasized",
  64         "glk-preformatted",
  65         "glk-header",
  66         "glk-subheader",
  67         "glk-alert",
  68         "glk-note",
  69         "glk-block-quote",
  70         "glk-input",
  71         "glk-user1",
  72         "glk-user2"
  73 };
  74
  75 const gchar**
  76 style_get_tag_names()
  77 {
  78         return TAG_NAMES;
  79 }
  80
  81 /* Internal function: mapping from style enum to tag name */
  82 static const gchar*
  83 get_tag_name(glui32 style)
  84 {
  85         if(style >= CHIMARA_NUM_STYLES) {
  86                 WARNING("Unsupported style");
  87                 return "normal";
  88         } else {
  89                 return (gchar*) TAG_NAMES[style];
  90         }
  91 }
  92
  93 /* Internal function: mapping from glk style enum to tag name */
  94 static const gchar*
  95 get_glk_tag_name(glui32 style)
  96 {
  97         if(style >= style_NUMSTYLES) {
  98                 WARNING("Unsupported style");
  99                 return "normal";
 100         } else {
 101                 return (gchar*) GLK_TAG_NAMES[style];
 102         }
 103 }
 104
 105 /**
 106  * glk_set_style_stream:
 107  * @str: Output stream to change the style of
 108  * @styl: The style to apply
 109  *
 110  * This changes the style of the stream @str. See glk_set_style().
 111  */
 112 void
 113 glk_set_style_stream(strid_t str, glui32 styl) {
 114 #ifdef DEBUG_STYLES
 115         g_printf("glk_set_style(str->rock=%d, styl=%d)\n", str->rock, styl);
 116 #endif
 117
 118         if(str->window == NULL)
 119                 return;
 120
 121         flush_window_buffer(str->window);
 122         str->style = (gchar*) get_tag_name(styl);
 123         str->glk_style = (gchar*) get_glk_tag_name(styl);
 124 }
 125
 126 /* Internal function: call this to initialize the layout of the 'more' prompt. */
 127 void
 128 style_init_more_prompt(winid_t win)
 129 {
 130         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 131
 132         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
 133         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
 134 }
 135
 136 /* Internal function: call this to initialize the default styles to a textbuffer. */
 137 void
 138 style_init_textbuffer(GtkTextBuffer *buffer)
 139 {
 140         g_return_if_fail(buffer != NULL);
 141
 142         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 143
 144         /* Place the default text tags in the textbuffer's tag table */
 145         g_hash_table_foreach(glk_data->styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 146
 147         /* Copy the override text tags to the textbuffers's tag table */
 148         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 149
 150         /* Assign the 'default' tag the lowest priority */
 151         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
 152 }
 153
 154
 155 /* Internal function: call this to initialize the default styles to a textgrid. */
 156 void
 157 style_init_textgrid(GtkTextBuffer *buffer)
 158 {
 159         g_return_if_fail(buffer != NULL);
 160
 161         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 162
 163         /* Place the default text tags in the textbuffer's tag table */
 164         g_hash_table_foreach(glk_data->styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 165
 166         /* Copy the current text tags to the textbuffers's tag table */
 167         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 168
 169         /* Assign the 'default' tag the lowest priority */
 170         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
 171 }
 172
 173 /* Internal function used to iterate over a style table, copying it */
 174 static void
 175 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 176 {
 177         g_return_if_fail(key != NULL);
 178         g_return_if_fail(tag != NULL);
 179         g_return_if_fail(target_table != NULL);
 180
 181         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 182 }
 183
 184 /* Internal function that copies a text tag */
 185 GtkTextTag *
 186 gtk_text_tag_copy(GtkTextTag *tag)
 187 {
 188         GtkTextTag *copy;
 189         char *tag_name;
 190         GParamSpec **properties;
 191         unsigned nprops, count;
 192
 193         g_return_val_if_fail(tag != NULL, NULL);
 194
 195         g_object_get(tag, "name", &tag_name, NULL);
 196         copy = gtk_text_tag_new(tag_name);
 197         g_free(tag_name);
 198
 199         /* Copy all the original tag's properties to the new tag */
 200         properties = g_object_class_list_properties( G_OBJECT_GET_CLASS(tag), &nprops );
 201         for(count = 0; count < nprops; count++) {
 202
 203                 /* Only copy properties that are readable, writable, not construct-only,
 204                 and not deprecated */
 205                 GParamFlags flags = properties[count]->flags;
 206                 if(flags & G_PARAM_CONSTRUCT_ONLY
 207                         || flags & G_PARAM_DEPRECATED
 208                         || !(flags & G_PARAM_READABLE)
 209                         || !(flags & G_PARAM_WRITABLE))
 210                         continue;
 211
 212                 const char *prop_name = g_param_spec_get_name(properties[count]);
 213                 GValue prop_value = G_VALUE_INIT;
 214
 215                 g_value_init( &prop_value, G_PARAM_SPEC_VALUE_TYPE(properties[count]) );
 216                 g_object_get_property( G_OBJECT(tag), prop_name, &prop_value );
 217                 /* Don't copy the PangoTabArray if it is NULL, that prints a warning */
 218                 if(strcmp(prop_name, "tabs") == 0 && g_value_get_boxed(&prop_value) == NULL) {
 219                         g_value_unset(&prop_value);
 220                         continue;
 221                 }
 222                 g_object_set_property( G_OBJECT(copy), prop_name, &prop_value );
 223                 g_value_unset(&prop_value);
 224         }
 225         g_free(properties);
 226
 227         /* Copy the data that was added manually */
 228         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse-color" );
 229
 230         if(reverse_color) {
 231                 g_object_set_data( G_OBJECT(copy), "reverse-color", reverse_color );
 232         }
 233
 234         return copy;
 235 }
 236
 237 /* Internal function that constructs the default styles */
 238 void
 239 style_init(ChimaraGlk *glk)
 240 {
 241         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 242
 243         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 244         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 245         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 246         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 247         GtkTextTag *tag;
 248
 249         /* Initialise the default styles for a text grid */
 250         tag = gtk_text_tag_new("default");
 251         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 252         g_hash_table_insert(default_text_grid_styles, "default", tag);
 253
 254         tag = gtk_text_tag_new("normal");
 255         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 256
 257         tag = gtk_text_tag_new("emphasized");
 258         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 259         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 260
 261         tag = gtk_text_tag_new("preformatted");
 262         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 263
 264         tag = gtk_text_tag_new("header");
 265         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 266         g_hash_table_insert(default_text_grid_styles, "header", tag);
 267
 268         tag = gtk_text_tag_new("subheader");
 269         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 270         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 271
 272         tag = gtk_text_tag_new("alert");
 273         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 274         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 275
 276         tag = gtk_text_tag_new("note");
 277         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 278         g_hash_table_insert(default_text_grid_styles, "note", tag);
 279
 280         tag = gtk_text_tag_new("block-quote");
 281         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 282         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 283
 284         tag = gtk_text_tag_new("input");
 285         g_hash_table_insert(default_text_grid_styles, "input", tag);
 286
 287         tag = gtk_text_tag_new("user1");
 288         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 289
 290         tag = gtk_text_tag_new("user2");
 291         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 292
 293         tag = gtk_text_tag_new("hyperlink");
 294         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 295         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 296
 297         /* Initialise the default styles for a text buffer */
 298         tag = gtk_text_tag_new("default");
 299         g_object_set(tag, "family", "Serif", "family-set", TRUE, NULL);
 300         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 301
 302         tag = gtk_text_tag_new("normal");
 303         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 304
 305         tag = gtk_text_tag_new("emphasized");
 306         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 307         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 308
 309         tag = gtk_text_tag_new("preformatted");
 310         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 311         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 312
 313         tag = gtk_text_tag_new("header");
 314         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 315         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 316
 317         tag = gtk_text_tag_new("subheader");
 318         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 319         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 320
 321         tag = gtk_text_tag_new("alert");
 322         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 323         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 324
 325         tag = gtk_text_tag_new("note");
 326         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 327         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 328
 329         tag = gtk_text_tag_new("block-quote");
 330         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 331         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 332
 333         tag = gtk_text_tag_new("input");
 334         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 335
 336         tag = gtk_text_tag_new("user1");
 337         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 338
 339         tag = gtk_text_tag_new("user2");
 340         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 341
 342         tag = gtk_text_tag_new("hyperlink");
 343         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 344         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 345
 346         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 347         g_object_set(pager_tag, "family", "Monospace", "family-set", TRUE, "foreground", "#ffffff", "foreground-set", TRUE, "background", "#000000", "background-set", TRUE, NULL);
 348         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 349         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 350
 351         priv->styles->text_grid = default_text_grid_styles;
 352         priv->styles->text_buffer = default_text_buffer_styles;
 353
 354
 355         /* Initialize the GLK styles to empty tags */
 356         int i;
 357         for(i=0; i<style_NUMSTYLES; i++) {
 358                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 359                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 360                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 361                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 362         }
 363
 364         priv->glk_styles->text_grid = glk_text_grid_styles;
 365         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 366
 367 }
 368
 369 /* Reset style tables to the library's internal defaults */
 370 void
 371 reset_default_styles(ChimaraGlk *glk)
 372 {
 373         /* TODO: write this function */
 374 }
 375
 376 /* Create the CSS file scanner */
 377 GScanner *
 378 create_css_file_scanner(void)
 379 {
 380         GScanner *scanner = g_scanner_new(NULL);
 381         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 382         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 383         scanner->config->symbol_2_token = TRUE;
 384         scanner->config->cpair_comment_single = NULL;
 385         scanner->config->scan_float = FALSE;
 386         return scanner;
 387 }
 388
 389 /* Run the scanner over the CSS file, overriding the default styles */
 390 void
 391 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 392 {
 393         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 394                 if( !style_accept_style_selector(scanner, glk) )
 395                         break;
 396         }
 397
 398         g_scanner_destroy(scanner);
 399
 400         /* Update the pager prompt to the new style */
 401         style_update(glk);
 402 }
 403
 404 /* Internal function: parses a token */
 405 static gboolean
 406 style_accept(GScanner *scanner, GTokenType token)
 407 {
 408         GTokenType next = g_scanner_get_next_token(scanner);
 409         if(next != token) {
 410                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 411                 return FALSE;
 412         }
 413         return TRUE;
 414 }
 415
 416 /* Internal function: parses a style selector */
 417 static gboolean
 418 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 419 {
 420         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 421
 422         GtkTextTag *current_tag;
 423         gchar *field;
 424         GTokenType token = g_scanner_get_next_token(scanner);
 425         GTokenValue value = g_scanner_cur_value(scanner);
 426
 427         if(
 428                 token != G_TOKEN_IDENTIFIER ||
 429                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 430         ) {
 431                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 432                 return FALSE;
 433         }
 434
 435         field = g_strdup(value.v_identifier);
 436
 437         /* Parse the tag name to change */
 438         if( g_scanner_peek_next_token(scanner) == '{') {
 439                 style_accept(scanner, '{');
 440                 if( !strcmp(field, "buffer") )
 441                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 442                 else
 443                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 444         } else {
 445                 if( !style_accept(scanner, '.') )
 446                         return FALSE;
 447
 448                 token = g_scanner_get_next_token(scanner);
 449                 value = g_scanner_cur_value(scanner);
 450
 451                 if(token != G_TOKEN_IDENTIFIER) {
 452                         g_scanner_error(scanner, "CSS Error: style selector expected");
 453                         return FALSE;
 454                 }
 455
 456                 if( !strcmp(field, "buffer") )
 457                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 458                 else
 459                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 460
 461                 if(current_tag == NULL) {
 462                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 463                         return FALSE;
 464                 }
 465
 466                 if( !style_accept(scanner, '{') )
 467                         return FALSE;
 468         }
 469
 470         while( g_scanner_peek_next_token(scanner) != '}') {
 471                 if( !style_accept_style_hint(scanner, current_tag) )
 472                         return FALSE;
 473         }
 474
 475         if( !style_accept(scanner, '}') )
 476                 return FALSE;
 477
 478         return TRUE;
 479 }
 480
 481 /* Internal function: parses a style hint */
 482 static gboolean
 483 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 484 {
 485         GTokenType token = g_scanner_get_next_token(scanner);
 486         GTokenValue value = g_scanner_cur_value(scanner);
 487         gchar *hint;
 488
 489         if(token != G_TOKEN_IDENTIFIER) {
 490                 g_scanner_error(scanner, "CSS Error: style hint expected");
 491                 return FALSE;
 492         }
 493
 494         hint = g_strdup(value.v_identifier);
 495
 496         if( !style_accept(scanner, ':') )
 497                 return FALSE;
 498
 499         token = g_scanner_get_next_token(scanner);
 500         value = g_scanner_cur_value(scanner);
 501
 502         if( !strcmp(hint, "font-family") ) {
 503                 if(token != G_TOKEN_STRING) {
 504                         g_scanner_error(scanner, "CSS Error: string expected");
 505                         return FALSE;
 506                 }
 507                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 508         }
 509         else if( !strcmp(hint, "font-weight") ) {
 510                 if(token != G_TOKEN_IDENTIFIER) {
 511                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 512                         return FALSE;
 513                 }
 514
 515                 if( !strcmp(value.v_identifier, "bold") )
 516                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 517                 else if( !strcmp(value.v_identifier, "normal") )
 518                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 519                 else {
 520                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 521                         return FALSE;
 522                 }
 523         }
 524         else if( !strcmp(hint, "font-style") ) {
 525                 if(token != G_TOKEN_IDENTIFIER) {
 526                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 527                         return FALSE;
 528                 }
 529
 530                 if( !strcmp(value.v_identifier, "italic") )
 531                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 532                 else if( !strcmp(value.v_identifier, "normal") )
 533                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 534                 else {
 535                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 536                         return FALSE;
 537                 }
 538         }
 539         else if( !strcmp(hint, "font-size") ) {
 540                 if(token == G_TOKEN_INT)
 541                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 542                 else if(token == G_TOKEN_FLOAT)
 543                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 544                 else {
 545                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 546                         return FALSE;
 547                 }
 548         }
 549         else if( !strcmp(hint, "color") ) {
 550                 if(token != G_TOKEN_IDENTIFIER) {
 551                         g_scanner_error(scanner, "CSS Error: hex color expected");
 552                         return FALSE;
 553                 }
 554
 555                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 556         }
 557         else if( !strcmp(hint, "background-color") ) {
 558                 if(token != G_TOKEN_IDENTIFIER) {
 559                         g_scanner_error(scanner, "CSS Error: hex color expected");
 560                         return FALSE;
 561                 }
 562                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 563         }
 564         else if( !strcmp(hint, "text-align") ) {
 565                 if(token != G_TOKEN_IDENTIFIER) {
 566                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 567                         return FALSE;
 568                 }
 569
 570                 if( !strcmp(value.v_identifier, "left") )
 571                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 572                 else if( !strcmp(value.v_identifier, "right") )
 573                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 574                 else if( !strcmp(value.v_identifier, "center") )
 575                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 576                 else {
 577                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 578                         return FALSE;
 579                 }
 580         }
 581         else if( !strcmp(hint, "margin-left") ) {
 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, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 587         }
 588         else if( !strcmp(hint, "margin-right") ) {
 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, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 594         }
 595         else if( !strcmp(hint, "margin-top") ) {
 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-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 601         }
 602         else if( !strcmp(hint, "margin-bottom") ) {
 603                 if(token != G_TOKEN_INT) {
 604                         g_scanner_error(scanner, "CSS Error: integer expected");
 605                         return FALSE;
 606                 }
 607                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 608         }
 609
 610         else {
 611                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 612                 return FALSE;
 613         }
 614
 615         if( !style_accept(scanner, ';') )
 616                 return FALSE;
 617
 618         return TRUE;
 619 }
 620
 621 /* Internal function: parses a glk color to a GdkColor */
 622 void
 623 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 624 {
 625         color->red = 256 * ((val & 0xff0000) >> 16);
 626         color->green = 256 * ((val & 0x00ff00) >> 8);
 627         color->blue = 256 * (val & 0x0000ff);
 628 }
 629
 630 /* Internal function: parses a glk color to a hex string */
 631 gchar*
 632 glkcolor_to_hex(glui32 val)
 633 {
 634         return g_strdup_printf("%04X%04X%04X",
 635                 256 * ((val & 0xff0000) >> 16),
 636                 256 * ((val & 0x00ff00) >> 8),
 637                 256 * (val & 0x0000ff)
 638         );
 639 }
 640
 641 /* Internal function: parses a gdk color to a hex string */
 642 gchar*
 643 gdkcolor_to_hex(GdkColor *color)
 644 {
 645         return g_strdup_printf("%04X%04X%04X",
 646                 color->red, color->green, color->blue
 647         );
 648 }
 649
 650 /* Internal function: parses a GdkColor to a glk color */
 651 static glui32
 652 gdkcolor_to_glkcolor(GdkColor *color)
 653 {
 654         g_return_val_if_fail(color != NULL, 0);
 655         return (glui32) color->pixel;
 656 }
 657
 658 /* Internal function: changes a GTK tag to correspond with the given style. */
 659 static void
 660 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 661 {
 662         g_return_if_fail(tag != NULL);
 663
 664         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 665         GObject *tag_object = G_OBJECT(tag);
 666
 667         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 668
 669         int i = 0;
 670         GdkColor color;
 671         switch(hint) {
 672         case stylehint_Indentation:
 673                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 674                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 675                 break;
 676
 677         case stylehint_ParaIndentation:
 678                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 679                 break;
 680
 681         case stylehint_Justification:
 682                 switch(val) {
 683                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 684                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 685                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 686                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 687                         default:
 688                                 WARNING("Unknown justification");
 689                                 i = GTK_JUSTIFY_LEFT;
 690                 }
 691                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 692                 break;
 693
 694         case stylehint_Weight:
 695                 switch(val) {
 696                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 697                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 698                         case  1: i = PANGO_WEIGHT_BOLD; break;
 699                         default: WARNING("Unknown font weight");
 700                 }
 701                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 702                 break;
 703
 704         case stylehint_Size:
 705                 {
 706                         gdouble scale = PANGO_SCALE_MEDIUM;
 707                         switch(val) {
 708                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 709                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 710                                 case -1: scale = PANGO_SCALE_SMALL; break;
 711                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 712                                 case  1: scale = PANGO_SCALE_LARGE; break;
 713                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 714                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 715                                 default:
 716                                         /* We follow Pango's convention of having each magnification
 717                                         step be a scaling of 1.2 */
 718                                         scale = pow(1.2, (double)val);
 719                         }
 720                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 721                 }
 722                 break;
 723
 724         case stylehint_Oblique:
 725                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 726                 break;
 727
 728         case stylehint_Proportional:
 729         {
 730                 gchar *font_family;
 731                 gboolean family_set;
 732
 733                 if(wintype != wintype_TextBuffer) {
 734                         if(val)
 735                                 WARNING("Style hint 'propotional' only supported on text buffers.");
 736
 737                         break;
 738                 }
 739
 740                 GtkTextTag *font_tag = g_hash_table_lookup(glk_data->styles->text_buffer, val? "default" : "preformatted");
 741                 g_object_get(font_tag, "family", &font_family, "family-set", &family_set, NULL);
 742                 g_object_set(tag_object, "family", font_family, "family-set", family_set, NULL);
 743                 g_free(font_family);
 744         }
 745                 break;
 746
 747         case stylehint_TextColor:
 748                 glkcolor_to_gdkcolor(val, &color);
 749
 750                 if(!reverse_color)
 751                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 752                 else
 753                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 754
 755                 break;
 756
 757         case stylehint_BackColor:
 758                 glkcolor_to_gdkcolor(val, &color);
 759
 760                 if(!reverse_color)
 761                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 762                 else
 763                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 764
 765                 break;
 766
 767         case stylehint_ReverseColor:
 768         {
 769                 // Determine the current colors
 770
 771                 // If all fails, use black/white
 772                 // FIXME: Use system theme here
 773                 GdkColor foreground, background;
 774                 gdk_color_parse("black", &foreground);
 775                 gdk_color_parse("white", &background);
 776                 GdkColor *current_foreground = &foreground;
 777                 GdkColor *current_background = &background;
 778
 779                 if(wintype == wintype_TextBuffer) {
 780                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 781                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 782                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 783                 }
 784                 else if(wintype == wintype_TextGrid) {
 785                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 786                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 787                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 788                 }
 789
 790                 if(val) {
 791                         /* Flip the fore- and background colors */
 792                         GdkColor *temp = current_foreground;
 793                         current_foreground = current_background;
 794                         current_background = temp;
 795                 }
 796
 797                 g_object_set(tag,
 798                         "foreground-gdk", current_foreground,
 799                         "foreground-set", TRUE,
 800                         "background-gdk", current_background,
 801                         "background-set", TRUE,
 802                         NULL
 803                 );
 804
 805                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 806                 break;
 807         }
 808
 809         default:
 810                 WARNING("Unknown style hint");
 811         }
 812 }
 813
 814 /* Internal function: queries a text tag for the value of a given style hint */
 815 static gint
 816 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 817 {
 818         gint intval;
 819         gdouble doubleval;
 820         GdkColor *colval;
 821
 822         g_return_val_if_fail(tag != NULL, 0);
 823
 824         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 825
 826         switch(hint) {
 827         case stylehint_Indentation:
 828                 g_object_get(tag, "left_margin", &intval, NULL);
 829                 return intval/5;
 830
 831         case stylehint_ParaIndentation:
 832                 g_object_get(tag, "indent", &intval, NULL);
 833                 return intval/5;
 834
 835         case stylehint_Justification:
 836                 g_object_get(tag, "justification", &intval, NULL);
 837                 switch(intval) {
 838                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 839                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 840                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 841                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 842                         default:
 843                                 WARNING("Unknown justification");
 844                                 return stylehint_just_LeftFlush;
 845                 }
 846
 847         case stylehint_Weight:
 848                 g_object_get(tag, "weight", &intval, NULL);
 849                 switch(intval) {
 850                         case PANGO_WEIGHT_LIGHT: return -1;
 851                         case PANGO_WEIGHT_NORMAL: return 0;
 852                         case PANGO_WEIGHT_BOLD: return 1;
 853                         default: WARNING("Unknown font weight"); return 0;
 854                 }
 855
 856         case stylehint_Size:
 857                 g_object_get(tag, "scale", &doubleval, NULL);
 858                 return (gint)round(log(doubleval) / log(1.2));
 859
 860         case stylehint_Oblique:
 861                 g_object_get(tag, "style", &intval , NULL);
 862                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 863
 864         case stylehint_Proportional:
 865                 /* Use pango_font_family_is_monospace()? */
 866         {
 867                 gchar *font_family, *query_font_family;
 868                 GtkTextTag *font_tag = g_hash_table_lookup(
 869                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 870                     "preformatted");
 871                 g_object_get(font_tag, "family", &font_family, NULL);
 872                 g_object_get(tag, "family", &query_font_family, NULL);
 873                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 874                 g_free(font_family);
 875                 g_free(query_font_family);
 876                 return retval;
 877         }
 878
 879         case stylehint_TextColor:
 880                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 881                 return gdkcolor_to_glkcolor(colval);
 882
 883         case stylehint_BackColor:
 884                 g_object_get(tag, "background-gdk", &colval, NULL);
 885                 return gdkcolor_to_glkcolor(colval);
 886
 887         case stylehint_ReverseColor:
 888                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 889
 890         default:
 891                 WARNING("Unknown style hint");
 892         }
 893
 894         return 0;
 895 }
 896
 897 /**
 898  * glk_stylehint_set:
 899  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 900  * @styl: The style to set a hint for.
 901  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 902  * @val: The style hint. The meaning of this depends on @hint.
 903  *
 904  * Sets a hint about the appearance of one style for a particular type of
 905  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 906  * all types of window.
 907  * <note><para>
 908  *  There is no equivalent constant to set a hint for all styles of a single
 909  *  window type.
 910  * </para></note>
 911  */
 912 void
 913 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 914 {
 915 #ifdef DEBUG_STYLES
 916         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 917 #endif
 918
 919         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 920
 921         GtkTextTag *to_change;
 922         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 923                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 924                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 925         }
 926
 927         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 928                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 929                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 930         }
 931 }
 932
 933 /**
 934  * glk_stylehint_clear:
 935  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 936  * @styl: The style to set a hint for.
 937  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 938  *
 939  * Clears a hint about the appearance of one style for a particular type of
 940  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 941  * which clears a hint for all types of window.
 942  * <note><para>
 943  *  There is no equivalent constant to reset a hint for all styles of a single
 944  *  window type.
 945  * </para></note>
 946  */
 947 void
 948 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 949 {
 950 #ifdef DEBUG_STYLES
 951         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 952 #endif
 953
 954         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 955         GtkTextTag *tag;
 956
 957         switch(wintype) {
 958         case wintype_TextBuffer:
 959                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 960                 if(tag) {
 961                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 962                 }
 963                 break;
 964         case wintype_TextGrid:
 965                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 966                 if(tag) {
 967                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 968                 }
 969         default:
 970                 return;
 971         }
 972 }
 973
 974 /**
 975  * glk_style_distinguish:
 976  * @win: The window in which the styles are to be distinguished.
 977  * @styl1: The first style to be distinguished from the second style.
 978  * @styl2: The second style to be distinguished from the first style.
 979  *
 980  * Decides whether two styles are visually distinguishable in the given window.
 981  * The exact meaning of this is left for the library to determine.
 982  * <note><title>Chimara</title><para>
 983  *   Currently, all styles of one window are assumed to be mutually
 984  *   distinguishable.
 985  * </para></note>
 986  *
 987  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 988  * are not, it returns %FALSE (0).
 989  */
 990 glui32
 991 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 992 {
 993 #ifdef DEBUG_STYLES
 994         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
 995 #endif
 996
 997         /* FIXME */
 998         return styl1 != styl2;
 999 }
1000
1001 /**
1002  * glk_style_measure:
1003  * @win: The window from which to take the style.
1004  * @styl: The style to perform the measurement on.
1005  * @hint: The stylehint to measure.
1006  * @result: Address to write the result to.
1007  *
1008  * Tries to test an attribute of one style in the given window @win. The library
1009  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1010  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1011  * at by @result.
1012  * <note><para>
1013  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1014  * </para></note>
1015  *
1016  * The meaning of the value depends on the hint which was tested:
1017  * <variablelist>
1018  * <varlistentry>
1019  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1020  *   <listitem><para>The indentation and paragraph indentation. These are in a
1021  *   metric which is platform-dependent.</para>
1022  *   <note><para>Most likely either characters or pixels.</para></note>
1023  *   </listitem>
1024  * </varlistentry>
1025  * <varlistentry>
1026  *   <term>%stylehint_Justification</term>
1027  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1028  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1029  *   %stylehint_just_RightFlush.</para></listitem>
1030  * </varlistentry>
1031  * <varlistentry>
1032  *   <term>%stylehint_Size</term>
1033  *   <listitem><para>The font size. Again, this is in a platform-dependent
1034  *   metric.</para>
1035  *   <note><para>Pixels, points, or simply 1 if the library does not support
1036  *   varying font sizes.</para></note>
1037  *   </listitem>
1038  * </varlistentry>
1039  * <varlistentry>
1040  *   <term>%stylehint_Weight</term>
1041  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1042  *   and -1 for light-weight fonts.</para></listitem>
1043  * </varlistentry>
1044  * <varlistentry>
1045  *   <term>%stylehint_Oblique</term>
1046  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1047  *   </listitem>
1048  * </varlistentry>
1049  * <varlistentry>
1050  *   <term>%stylehint_Proportional</term>
1051  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1052  *   </para></listitem>
1053  * </varlistentry>
1054  * <varlistentry>
1055  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1056  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1057  *   described in <link
1058  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1059  *   Appearance of Styles</link>.</para></listitem>
1060  * </varlistentry>
1061  * <varlistentry>
1062  *   <term>%stylehint_ReverseColor</term>
1063  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1064  *   colors are reversed.</para></listitem>
1065  * </varlistentry>
1066  * </variablelist>
1067  * Signed values, such as the %stylehint_Weight value, are cast to
1068  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1069  * in a more natural context.
1070  *
1071  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1072  */
1073 glui32
1074 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1075 {
1076 #ifdef DEBUG_STYLES
1077         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1078 #endif
1079
1080         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1081         GtkTextTag *tag;
1082
1083         switch(win->type) {
1084         case wintype_TextBuffer:
1085                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1086                 if(result)
1087                         *result = query_tag(tag, win->type, hint);
1088                 break;
1089         case wintype_TextGrid:
1090                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1091                 if(result)
1092                         *result = query_tag(tag, win->type, hint);
1093         default:
1094                 return FALSE;
1095         }
1096
1097         return TRUE;
1098 }
1099
1100 /* Internal function returning the current default font for a window type
1101  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1102  * supported for now */
1103 PangoFontDescription *
1104 get_current_font(guint32 wintype)
1105 {
1106         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1107         GHashTable *styles, *glk_styles;
1108         PangoFontDescription *font;
1109
1110         switch(wintype) {
1111         case wintype_TextGrid:
1112                 styles = glk_data->styles->text_grid;
1113                 glk_styles = glk_data->glk_styles->text_grid;
1114                 font = pango_font_description_from_string("Monospace");
1115                 break;
1116         case wintype_TextBuffer:
1117                 styles = glk_data->styles->text_buffer;
1118                 glk_styles = glk_data->glk_styles->text_buffer;
1119                 font = pango_font_description_from_string("Serif");
1120                 break;
1121         default:
1122                 return NULL;
1123         }
1124
1125         PangoAttrList *list = pango_attr_list_new();
1126
1127         text_tag_to_attr_list( g_hash_table_lookup(styles, "default"), list );
1128         PangoAttrIterator *it = pango_attr_list_get_iterator(list);
1129         pango_attr_iterator_get_font(it, font, NULL, NULL);
1130         pango_attr_iterator_destroy(it);
1131
1132         text_tag_to_attr_list( g_hash_table_lookup(styles, "normal"), list );
1133         it = pango_attr_list_get_iterator(list);
1134         pango_attr_iterator_get_font(it, font, NULL, NULL);
1135         pango_attr_iterator_destroy(it);
1136
1137         text_tag_to_attr_list( g_hash_table_lookup(glk_styles, "glk-normal"), list );
1138         it = pango_attr_list_get_iterator(list);
1139         pango_attr_iterator_get_font(it, font, NULL, NULL);
1140         pango_attr_iterator_destroy(it);
1141
1142         /* Make a copy of the family, preventing it's destruction at the end of this function. */
1143         pango_font_description_set_family( font, pango_font_description_get_family(font) );
1144
1145         pango_attr_list_unref(list);
1146
1147         return font;
1148 }
1149
1150 /* Internal function copying the attributes of a text tag to a pango attribute list */
1151 static void
1152 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1153 {
1154         gboolean set;
1155         GdkColor *foreground, *background;
1156         gchar *string;
1157         PangoFontDescription *font_desc;
1158         gboolean strikethrough;
1159         PangoUnderline underline;
1160
1161         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1162         if(set) {
1163                 pango_attr_list_insert(
1164                         list,
1165                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1166                 );
1167         }
1168         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1169         if(set) {
1170                 pango_attr_list_insert(
1171                         list,
1172                         pango_attr_background_new(background->red, background->green, background->blue)
1173                 );
1174         }
1175         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1176         if(set) {
1177                 pango_attr_list_insert(
1178                         list,
1179                         pango_attr_language_new( pango_language_from_string(string) )
1180                 );
1181         }
1182
1183         /* Font description updates the following properties simultaniously:
1184          * family, style, weight, variant, stretch, size.
1185          * FIXME: Except it doesn't really.
1186          */
1187         g_object_get(tag, "font-desc", &font_desc, NULL);
1188         pango_attr_list_insert(
1189                 list,
1190                 pango_attr_font_desc_new(font_desc)
1191         );
1192
1193         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1194         if(set) {
1195                 pango_attr_list_insert(
1196                         list,
1197                         pango_attr_strikethrough_new(strikethrough)
1198                 );
1199         }
1200         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1201         if(set) {
1202                 pango_attr_list_insert(
1203                         list,
1204                         pango_attr_underline_new(underline)
1205                 );
1206         }
1207 }
1208
1209 /* Update pager tag */
1210 void
1211 style_update(ChimaraGlk *glk)
1212 {
1213         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1214
1215         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1216         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1217 }
1218
1219 /* Determine the current colors used to render the text for a given stream.
1220  * This can be set in a number of places */
1221 static void
1222 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1223 {
1224         gboolean foreground_set = FALSE;
1225         gboolean background_set = FALSE;
1226         gint reverse_color;
1227
1228         // Default color
1229         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1230         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1231         if(foreground_set)
1232                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1233         if(background_set)
1234                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1235
1236         // Player defined color
1237         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1238         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1239         if(foreground_set)
1240                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1241         if(background_set)
1242                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1243
1244         // GLK defined color
1245         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1246         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1247         if(foreground_set)
1248                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1249         if(background_set)
1250                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1251
1252 }
1253
1254 /* Determine the current colors used to render the text for a given stream.
1255  * This can be set in a number of places */
1256 void
1257 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1258 {
1259         VALID_STREAM(str, return);
1260         g_return_if_fail(str->window != NULL);
1261         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1262
1263         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1264         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1265         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1266         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1267         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1268
1269         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1270
1271         gboolean foreground_set, background_set;
1272
1273         // Windows can have zcolors defined
1274         if(str->window->zcolor) {
1275                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1276                 if(foreground_set)
1277                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1278                 if(background_set)
1279                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1280         }
1281 }
1282
1283 /* Apply styles to a segment of text in a GtkTextBuffer
1284  */
1285 void
1286 style_apply(winid_t win, GtkTextIter *start, GtkTextIter *end)
1287 {
1288         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
1289         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1290
1291         GtkTextTag *default_tag = gtk_text_tag_table_lookup(tags, "default");
1292         GtkTextTag *style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->style);
1293         GtkTextTag *glk_style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->glk_style);
1294
1295         // Player's style overrides
1296         gtk_text_buffer_apply_tag(buffer, style_tag, start, end);
1297
1298         // GLK Program's style overrides
1299         gtk_text_buffer_apply_tag(buffer, glk_style_tag, start, end);
1300
1301         // Default style
1302         gtk_text_buffer_apply_tag(buffer, default_tag, start, end);
1303
1304         // Link style overrides
1305         if(win->window_stream->hyperlink_mode) {
1306                 GtkTextTag *link_style_tag = gtk_text_tag_table_lookup(tags, "hyperlink");
1307                 GtkTextTag *link_tag = win->current_hyperlink->tag;
1308                 gtk_text_buffer_apply_tag(buffer, link_style_tag, start, end);
1309                 gtk_text_buffer_apply_tag(buffer, link_tag, start, end);
1310         }
1311
1312         // GLK Program's style overrides using garglk_set_zcolors()
1313         if(win->zcolor != NULL) {
1314                 gtk_text_buffer_apply_tag(buffer, win->zcolor, start, end);
1315         }
1316
1317         // GLK Program's style overrides using garglk_set_reversevideo()
1318         if(win->zcolor_reversed != NULL) {
1319                 gtk_text_buffer_apply_tag(buffer, win->zcolor_reversed, start, end);
1320         }
1321 }
1322