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
 151
 152 /* Internal function: call this to initialize the default styles to a textgrid. */
 153 void
 154 style_init_textgrid(GtkTextBuffer *buffer)
 155 {
 156         g_return_if_fail(buffer != NULL);
 157
 158         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 159
 160         /* Place the default text tags in the textbuffer's tag table */
 161         g_hash_table_foreach(glk_data->styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 162
 163         /* Copy the current text tags to the textbuffers's tag table */
 164         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 165 }
 166
 167 /* Internal function used to iterate over a style table, copying it */
 168 static void
 169 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 170 {
 171         g_return_if_fail(key != NULL);
 172         g_return_if_fail(tag != NULL);
 173         g_return_if_fail(target_table != NULL);
 174
 175         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 176 }
 177
 178 /* Internal function that copies a text tag */
 179 GtkTextTag *
 180 gtk_text_tag_copy(GtkTextTag *tag)
 181 {
 182         GtkTextTag *copy;
 183
 184         g_return_val_if_fail(tag != NULL, NULL);
 185
 186         copy = gtk_text_tag_new(tag->name);
 187         gtk_text_attributes_copy_values(tag->values, copy->values);
 188
 189         #define _COPY_FLAG(flag) copy->flag = tag->flag
 190                 _COPY_FLAG (bg_color_set);
 191                 _COPY_FLAG (bg_color_set);
 192                 _COPY_FLAG (bg_stipple_set);
 193                 _COPY_FLAG (fg_color_set);
 194                 _COPY_FLAG (fg_stipple_set);
 195                 _COPY_FLAG (justification_set);
 196                 _COPY_FLAG (left_margin_set);
 197                 _COPY_FLAG (indent_set);
 198                 _COPY_FLAG (rise_set);
 199                 _COPY_FLAG (strikethrough_set);
 200                 _COPY_FLAG (right_margin_set);
 201                 _COPY_FLAG (pixels_above_lines_set);
 202                 _COPY_FLAG (pixels_below_lines_set);
 203                 _COPY_FLAG (pixels_inside_wrap_set);
 204                 _COPY_FLAG (tabs_set);
 205                 _COPY_FLAG (underline_set);
 206                 _COPY_FLAG (wrap_mode_set);
 207                 _COPY_FLAG (bg_full_height_set);
 208                 _COPY_FLAG (invisible_set);
 209                 _COPY_FLAG (editable_set);
 210                 _COPY_FLAG (language_set);
 211                 _COPY_FLAG (scale_set);
 212         #undef _COPY_FLAG
 213
 214         /* Copy the data that was added manually */
 215         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse-color" );
 216
 217         if(reverse_color) {
 218                 g_object_set_data( G_OBJECT(copy), "reverse-color", reverse_color );
 219         }
 220
 221         return copy;
 222 }
 223
 224 /* Internal function that constructs the default styles */
 225 void
 226 style_init(ChimaraGlk *glk)
 227 {
 228         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 229
 230         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 231         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 232         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 233         GHashTable *glk_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", 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, 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, 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", "weight", PANGO_WEIGHT_BOLD, 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", "weight", PANGO_WEIGHT_BOLD, 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", "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", 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", 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, 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, 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", "weight", PANGO_WEIGHT_BOLD, 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", "weight", PANGO_WEIGHT_BOLD, 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, "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", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 331         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 332
 333         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 334         g_object_set(pager_tag, "foreground", "#ffffff", "background", "#000000", NULL);
 335         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 336         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 337
 338         priv->styles->text_grid = default_text_grid_styles;
 339         priv->styles->text_buffer = default_text_buffer_styles;
 340
 341
 342         /* Initialize the GLK styles to empty tags */
 343         int i;
 344         for(i=0; i<style_NUMSTYLES; i++) {
 345                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 346                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 347                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 348                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 349         }
 350
 351         priv->glk_styles->text_grid = glk_text_grid_styles;
 352         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 353
 354 }
 355
 356 /* Reset style tables to the library's internal defaults */
 357 void
 358 reset_default_styles(ChimaraGlk *glk)
 359 {
 360         /* TODO: write this function */
 361 }
 362
 363 /* Create the CSS file scanner */
 364 GScanner *
 365 create_css_file_scanner(void)
 366 {
 367         GScanner *scanner = g_scanner_new(NULL);
 368         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 369         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 370         scanner->config->symbol_2_token = TRUE;
 371         scanner->config->cpair_comment_single = NULL;
 372         scanner->config->scan_float = FALSE;
 373         return scanner;
 374 }
 375
 376 /* Run the scanner over the CSS file, overriding the default styles */
 377 void
 378 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 379 {
 380         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 381
 382         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 383                 if( !style_accept_style_selector(scanner, glk) )
 384                         break;
 385         }
 386
 387         g_scanner_destroy(scanner);
 388
 389         /* Update the pager prompt to the new style */
 390         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 391         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 392 }
 393
 394 /* Internal function: parses a token */
 395 static gboolean
 396 style_accept(GScanner *scanner, GTokenType token)
 397 {
 398         GTokenType next = g_scanner_get_next_token(scanner);
 399         if(next != token) {
 400                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 401                 return FALSE;
 402         }
 403         return TRUE;
 404 }
 405
 406 /* Internal function: parses a style selector */
 407 static gboolean
 408 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 409 {
 410         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 411
 412         GtkTextTag *current_tag;
 413         gchar *field;
 414         GTokenType token = g_scanner_get_next_token(scanner);
 415         GTokenValue value = g_scanner_cur_value(scanner);
 416
 417         if(
 418                 token != G_TOKEN_IDENTIFIER ||
 419                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 420         ) {
 421                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 422                 return FALSE;
 423         }
 424
 425         field = g_strdup(value.v_identifier);
 426
 427         /* Parse the tag name to change */
 428         if( g_scanner_peek_next_token(scanner) == '{') {
 429                 style_accept(scanner, '{');
 430                 if( !strcmp(field, "buffer") )
 431                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 432                 else
 433                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 434         } else {
 435                 if( !style_accept(scanner, '.') )
 436                         return FALSE;
 437
 438                 token = g_scanner_get_next_token(scanner);
 439                 value = g_scanner_cur_value(scanner);
 440
 441                 if(token != G_TOKEN_IDENTIFIER) {
 442                         g_scanner_error(scanner, "CSS Error: style selector expected");
 443                         return FALSE;
 444                 }
 445
 446                 if( !strcmp(field, "buffer") )
 447                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 448                 else
 449                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 450
 451                 if(current_tag == NULL) {
 452                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 453                         return FALSE;
 454                 }
 455
 456                 if( !style_accept(scanner, '{') )
 457                         return FALSE;
 458         }
 459
 460         while( g_scanner_peek_next_token(scanner) != '}') {
 461                 if( !style_accept_style_hint(scanner, current_tag) )
 462                         return FALSE;
 463         }
 464
 465         if( !style_accept(scanner, '}') )
 466                 return FALSE;
 467
 468         return TRUE;
 469 }
 470
 471 /* Internal function: parses a style hint */
 472 static gboolean
 473 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 474 {
 475         GTokenType token = g_scanner_get_next_token(scanner);
 476         GTokenValue value = g_scanner_cur_value(scanner);
 477         gchar *hint;
 478
 479         if(token != G_TOKEN_IDENTIFIER) {
 480                 g_scanner_error(scanner, "CSS Error: style hint expected");
 481                 return FALSE;
 482         }
 483
 484         hint = g_strdup(value.v_identifier);
 485
 486         if( !style_accept(scanner, ':') )
 487                 return FALSE;
 488
 489         token = g_scanner_get_next_token(scanner);
 490         value = g_scanner_cur_value(scanner);
 491
 492         if( !strcmp(hint, "font-family") ) {
 493                 if(token != G_TOKEN_STRING) {
 494                         g_scanner_error(scanner, "CSS Error: string expected");
 495                         return FALSE;
 496                 }
 497                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 498         }
 499         else if( !strcmp(hint, "font-weight") ) {
 500                 if(token != G_TOKEN_IDENTIFIER) {
 501                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 502                         return FALSE;
 503                 }
 504
 505                 if( !strcmp(value.v_identifier, "bold") )
 506                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 507                 else if( !strcmp(value.v_identifier, "normal") )
 508                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 509                 else {
 510                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 511                         return FALSE;
 512                 }
 513         }
 514         else if( !strcmp(hint, "font-style") ) {
 515                 if(token != G_TOKEN_IDENTIFIER) {
 516                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 517                         return FALSE;
 518                 }
 519
 520                 if( !strcmp(value.v_identifier, "italic") )
 521                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 522                 else if( !strcmp(value.v_identifier, "normal") )
 523                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 524                 else {
 525                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 526                         return FALSE;
 527                 }
 528         }
 529         else if( !strcmp(hint, "font-size") ) {
 530                 if(token == G_TOKEN_INT)
 531                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 532                 else if(token == G_TOKEN_FLOAT)
 533                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 534                 else {
 535                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 536                         return FALSE;
 537                 }
 538         }
 539         else if( !strcmp(hint, "color") ) {
 540                 if(token != G_TOKEN_IDENTIFIER) {
 541                         g_scanner_error(scanner, "CSS Error: hex color expected");
 542                         return FALSE;
 543                 }
 544
 545                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 546         }
 547         else if( !strcmp(hint, "background-color") ) {
 548                 if(token != G_TOKEN_IDENTIFIER) {
 549                         g_scanner_error(scanner, "CSS Error: hex color expected");
 550                         return FALSE;
 551                 }
 552                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 553         }
 554         else if( !strcmp(hint, "text-align") ) {
 555                 if(token != G_TOKEN_IDENTIFIER) {
 556                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 557                         return FALSE;
 558                 }
 559
 560                 if( !strcmp(value.v_identifier, "left") )
 561                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 562                 else if( !strcmp(value.v_identifier, "right") )
 563                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 564                 else if( !strcmp(value.v_identifier, "center") )
 565                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 566                 else {
 567                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 568                         return FALSE;
 569                 }
 570         }
 571         else if( !strcmp(hint, "margin-left") ) {
 572                 if(token != G_TOKEN_INT) {
 573                         g_scanner_error(scanner, "CSS Error: integer expected");
 574                         return FALSE;
 575                 }
 576                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 577         }
 578         else if( !strcmp(hint, "margin-right") ) {
 579                 if(token != G_TOKEN_INT) {
 580                         g_scanner_error(scanner, "CSS Error: integer expected");
 581                         return FALSE;
 582                 }
 583                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 584         }
 585         else if( !strcmp(hint, "margin-top") ) {
 586                 if(token != G_TOKEN_INT) {
 587                         g_scanner_error(scanner, "CSS Error: integer expected");
 588                         return FALSE;
 589                 }
 590                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 591         }
 592         else if( !strcmp(hint, "margin-bottom") ) {
 593                 if(token != G_TOKEN_INT) {
 594                         g_scanner_error(scanner, "CSS Error: integer expected");
 595                         return FALSE;
 596                 }
 597                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 598         }
 599
 600         else {
 601                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 602                 return FALSE;
 603         }
 604
 605         if( !style_accept(scanner, ';') )
 606                 return FALSE;
 607
 608         return TRUE;
 609 }
 610
 611 /* Internal function: parses a glk color to a GdkColor */
 612 void
 613 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 614 {
 615         color->red = 256 * ((val & 0xff0000) >> 16);
 616         color->green = 256 * ((val & 0x00ff00) >> 8);
 617         color->blue = 256 * (val & 0x0000ff);
 618 }
 619
 620 /* Internal function: parses a glk color to a hex string */
 621 gchar*
 622 glkcolor_to_hex(glui32 val)
 623 {
 624         return g_strdup_printf("%04X%04X%04X",
 625                 256 * ((val & 0xff0000) >> 16),
 626                 256 * ((val & 0x00ff00) >> 8),
 627                 256 * (val & 0x0000ff)
 628         );
 629 }
 630
 631 /* Internal function: parses a gdk color to a hex string */
 632 gchar*
 633 gdkcolor_to_hex(GdkColor *color)
 634 {
 635         return g_strdup_printf("%04X%04X%04X",
 636                 color->red, color->green, color->blue
 637         );
 638 }
 639
 640 /* Internal function: parses a GdkColor to a glk color */
 641 static glui32
 642 gdkcolor_to_glkcolor(GdkColor *color)
 643 {
 644         g_return_val_if_fail(color != NULL, 0);
 645         return (glui32) color->pixel;
 646 }
 647
 648 /* Internal function: changes a GTK tag to correspond with the given style. */
 649 static void
 650 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 651 {
 652         g_return_if_fail(tag != NULL);
 653
 654         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 655         GObject *tag_object = G_OBJECT(tag);
 656
 657         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 658
 659         int i = 0;
 660         GdkColor color;
 661         switch(hint) {
 662         case stylehint_Indentation:
 663                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 664                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 665                 break;
 666
 667         case stylehint_ParaIndentation:
 668                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 669                 break;
 670
 671         case stylehint_Justification:
 672                 switch(val) {
 673                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 674                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 675                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 676                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 677                         default:
 678                                 WARNING("Unknown justification");
 679                                 i = GTK_JUSTIFY_LEFT;
 680                 }
 681                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 682                 break;
 683
 684         case stylehint_Weight:
 685                 switch(val) {
 686                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 687                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 688                         case  1: i = PANGO_WEIGHT_BOLD; break;
 689                         default: WARNING("Unknown font weight");
 690                 }
 691                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 692                 break;
 693
 694         case stylehint_Size:
 695                 {
 696                         gdouble scale = PANGO_SCALE_MEDIUM;
 697                         switch(val) {
 698                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 699                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 700                                 case -1: scale = PANGO_SCALE_SMALL; break;
 701                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 702                                 case  1: scale = PANGO_SCALE_LARGE; break;
 703                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 704                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 705                                 default:
 706                                         /* We follow Pango's convention of having each magnification
 707                                         step be a scaling of 1.2 */
 708                                         scale = pow(1.2, (double)val);
 709                         }
 710                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 711                 }
 712                 break;
 713
 714         case stylehint_Oblique:
 715                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 716                 break;
 717
 718         case stylehint_Proportional:
 719         {
 720                 gchar *font_family;
 721                 GtkTextTag *font_tag = g_hash_table_lookup(
 722                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 723                     val? "default" : "preformatted");
 724                 g_object_get(font_tag, "family", &font_family, NULL);
 725                 g_object_set(tag_object, "family", font_family, "family-set", TRUE, NULL);
 726                 g_free(font_family);
 727         }
 728                 break;
 729
 730         case stylehint_TextColor:
 731                 glkcolor_to_gdkcolor(val, &color);
 732
 733                 if(!reverse_color)
 734                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 735                 else
 736                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 737
 738                 break;
 739
 740         case stylehint_BackColor:
 741                 glkcolor_to_gdkcolor(val, &color);
 742
 743                 if(!reverse_color)
 744                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 745                 else
 746                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 747
 748                 break;
 749
 750         case stylehint_ReverseColor:
 751         {
 752                 // Determine the current colors
 753
 754                 // If all fails, use black/white
 755                 // FIXME: Use system theme here
 756                 GdkColor foreground, background;
 757                 gdk_color_parse("black", &foreground);
 758                 gdk_color_parse("white", &background);
 759                 GdkColor *current_foreground = &foreground;
 760                 GdkColor *current_background = &background;
 761
 762                 if(wintype == wintype_TextBuffer) {
 763                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 764                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 765                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 766                 }
 767                 else if(wintype == wintype_TextGrid) {
 768                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 769                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 770                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 771                 }
 772
 773                 if(val) {
 774                         /* Flip the fore- and background colors */
 775                         GdkColor *temp = current_foreground;
 776                         current_foreground = current_background;
 777                         current_background = temp;
 778                 }
 779
 780                 g_object_set(tag,
 781                         "foreground-gdk", current_foreground,
 782                         "foreground-set", TRUE,
 783                         "background-gdk", current_background,
 784                         "background-set", TRUE,
 785                         NULL
 786                 );
 787
 788                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 789                 break;
 790         }
 791
 792         default:
 793                 WARNING("Unknown style hint");
 794         }
 795 }
 796
 797 /* Internal function: queries a text tag for the value of a given style hint */
 798 static gint
 799 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 800 {
 801         gint intval;
 802         gdouble doubleval;
 803         GdkColor *colval;
 804
 805         g_return_val_if_fail(tag != NULL, 0);
 806
 807         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 808
 809         switch(hint) {
 810         case stylehint_Indentation:
 811                 g_object_get(tag, "left_margin", &intval, NULL);
 812                 return intval/5;
 813
 814         case stylehint_ParaIndentation:
 815                 g_object_get(tag, "indent", &intval, NULL);
 816                 return intval/5;
 817
 818         case stylehint_Justification:
 819                 g_object_get(tag, "justification", &intval, NULL);
 820                 switch(intval) {
 821                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 822                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 823                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 824                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 825                         default:
 826                                 WARNING("Unknown justification");
 827                                 return stylehint_just_LeftFlush;
 828                 }
 829
 830         case stylehint_Weight:
 831                 g_object_get(tag, "weight", &intval, NULL);
 832                 switch(intval) {
 833                         case PANGO_WEIGHT_LIGHT: return -1;
 834                         case PANGO_WEIGHT_NORMAL: return 0;
 835                         case PANGO_WEIGHT_BOLD: return 1;
 836                         default: WARNING("Unknown font weight"); return 0;
 837                 }
 838
 839         case stylehint_Size:
 840                 g_object_get(tag, "scale", &doubleval, NULL);
 841                 return (gint)round(log(doubleval) / log(1.2));
 842
 843         case stylehint_Oblique:
 844                 g_object_get(tag, "style", &intval , NULL);
 845                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 846
 847         case stylehint_Proportional:
 848                 /* Use pango_font_family_is_monospace()? */
 849         {
 850                 gchar *font_family, *query_font_family;
 851                 GtkTextTag *font_tag = g_hash_table_lookup(
 852                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 853                     "preformatted");
 854                 g_object_get(font_tag, "family", &font_family, NULL);
 855                 g_object_get(tag, "family", &query_font_family, NULL);
 856                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 857                 g_free(font_family);
 858                 g_free(query_font_family);
 859                 return retval;
 860         }
 861
 862         case stylehint_TextColor:
 863                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 864                 return gdkcolor_to_glkcolor(colval);
 865
 866         case stylehint_BackColor:
 867                 g_object_get(tag, "background-gdk", &colval, NULL);
 868                 return gdkcolor_to_glkcolor(colval);
 869
 870         case stylehint_ReverseColor:
 871                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 872
 873         default:
 874                 WARNING("Unknown style hint");
 875         }
 876
 877         return 0;
 878 }
 879
 880 /**
 881  * glk_stylehint_set:
 882  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 883  * @styl: The style to set a hint for.
 884  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 885  * @val: The style hint. The meaning of this depends on @hint.
 886  *
 887  * Sets a hint about the appearance of one style for a particular type of
 888  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 889  * all types of window.
 890  * <note><para>
 891  *  There is no equivalent constant to set a hint for all styles of a single
 892  *  window type.
 893  * </para></note>
 894  */
 895 void
 896 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 897 {
 898 #ifdef DEBUG_STYLES
 899         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 900 #endif
 901
 902         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 903
 904         GtkTextTag *to_change;
 905         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 906                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 907                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 908         }
 909
 910         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 911                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 912                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 913         }
 914 }
 915
 916 /**
 917  * glk_stylehint_clear:
 918  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 919  * @styl: The style to set a hint for.
 920  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 921  *
 922  * Clears a hint about the appearance of one style for a particular type of
 923  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 924  * which clears a hint for all types of window.
 925  * <note><para>
 926  *  There is no equivalent constant to reset a hint for all styles of a single
 927  *  window type.
 928  * </para></note>
 929  */
 930 void
 931 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 932 {
 933 #ifdef DEBUG_STYLES
 934         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 935 #endif
 936
 937         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 938         GtkTextTag *tag;
 939
 940         switch(wintype) {
 941         case wintype_TextBuffer:
 942                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 943                 if(tag) {
 944                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 945                 }
 946                 break;
 947         case wintype_TextGrid:
 948                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 949                 if(tag) {
 950                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 951                 }
 952         default:
 953                 return;
 954         }
 955 }
 956
 957 /**
 958  * glk_style_distinguish:
 959  * @win: The window in which the styles are to be distinguished.
 960  * @styl1: The first style to be distinguished from the second style.
 961  * @styl2: The second style to be distinguished from the first style.
 962  *
 963  * Decides whether two styles are visually distinguishable in the given window.
 964  * The exact meaning of this is left for the library to determine.
 965  * <note><title>Chimara</title><para>
 966  *   Currently, all styles of one window are assumed to be mutually
 967  *   distinguishable.
 968  * </para></note>
 969  *
 970  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 971  * are not, it returns %FALSE (0).
 972  */
 973 glui32
 974 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 975 {
 976 #ifdef DEBUG_STYLES
 977         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
 978 #endif
 979
 980         /* FIXME */
 981         return styl1 != styl2;
 982 }
 983
 984 /**
 985  * glk_style_measure:
 986  * @win: The window from which to take the style.
 987  * @styl: The style to perform the measurement on.
 988  * @hint: The stylehint to measure.
 989  * @result: Address to write the result to.
 990  *
 991  * Tries to test an attribute of one style in the given window @win. The library
 992  * may not be able to determine the attribute; if not, this returns %FALSE (0).
 993  * If it can, it returns %TRUE (1) and stores the value in the location pointed
 994  * at by @result.
 995  * <note><para>
 996  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
 997  * </para></note>
 998  *
 999  * The meaning of the value depends on the hint which was tested:
1000  * <variablelist>
1001  * <varlistentry>
1002  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1003  *   <listitem><para>The indentation and paragraph indentation. These are in a
1004  *   metric which is platform-dependent.</para>
1005  *   <note><para>Most likely either characters or pixels.</para></note>
1006  *   </listitem>
1007  * </varlistentry>
1008  * <varlistentry>
1009  *   <term>%stylehint_Justification</term>
1010  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1011  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1012  *   %stylehint_just_RightFlush.</para></listitem>
1013  * </varlistentry>
1014  * <varlistentry>
1015  *   <term>%stylehint_Size</term>
1016  *   <listitem><para>The font size. Again, this is in a platform-dependent
1017  *   metric.</para>
1018  *   <note><para>Pixels, points, or simply 1 if the library does not support
1019  *   varying font sizes.</para></note>
1020  *   </listitem>
1021  * </varlistentry>
1022  * <varlistentry>
1023  *   <term>%stylehint_Weight</term>
1024  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1025  *   and -1 for light-weight fonts.</para></listitem>
1026  * </varlistentry>
1027  * <varlistentry>
1028  *   <term>%stylehint_Oblique</term>
1029  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1030  *   </listitem>
1031  * </varlistentry>
1032  * <varlistentry>
1033  *   <term>%stylehint_Proportional</term>
1034  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1035  *   </para></listitem>
1036  * </varlistentry>
1037  * <varlistentry>
1038  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1039  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1040  *   described in <link
1041  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1042  *   Appearance of Styles</link>.</para></listitem>
1043  * </varlistentry>
1044  * <varlistentry>
1045  *   <term>%stylehint_ReverseColor</term>
1046  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1047  *   colors are reversed.</para></listitem>
1048  * </varlistentry>
1049  * </variablelist>
1050  * Signed values, such as the %stylehint_Weight value, are cast to
1051  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1052  * in a more natural context.
1053  *
1054  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1055  */
1056 glui32
1057 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1058 {
1059 #ifdef DEBUG_STYLES
1060         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1061 #endif
1062
1063         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1064         GtkTextTag *tag;
1065
1066         switch(win->type) {
1067         case wintype_TextBuffer:
1068                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1069                 if(result)
1070                         *result = query_tag(tag, win->type, hint);
1071                 break;
1072         case wintype_TextGrid:
1073                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1074                 if(result)
1075                         *result = query_tag(tag, win->type, hint);
1076         default:
1077                 return FALSE;
1078         }
1079
1080         return TRUE;
1081 }
1082
1083 /* Internal function returning the current default font for a window type
1084  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1085  * supported for now */
1086 PangoFontDescription *
1087 get_current_font(guint32 wintype)
1088 {
1089         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1090         GtkTextTag *tag;
1091
1092         switch(wintype) {
1093         case wintype_TextGrid:
1094                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1095                 return pango_font_description_from_string("Monospace");
1096                 break;
1097         case wintype_TextBuffer:
1098                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1099                 return pango_font_description_from_string("Serif");
1100                 break;
1101         default:
1102                 return NULL;
1103         }
1104
1105         PangoFontDescription *font;
1106         return font;
1107 }
1108
1109 /* Internal function copying the attributes of a text tag to a pango attribute list */
1110 static void
1111 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1112 {
1113         gboolean set;
1114         GdkColor *foreground, *background;
1115         gchar *string;
1116         PangoFontDescription *font_desc;
1117         gboolean strikethrough;
1118         PangoUnderline underline;
1119
1120         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1121         if(set) {
1122                 pango_attr_list_insert(
1123                         list,
1124                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1125                 );
1126         }
1127         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1128         if(set) {
1129                 pango_attr_list_insert(
1130                         list,
1131                         pango_attr_background_new(background->red, background->green, background->blue)
1132                 );
1133         }
1134         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1135         if(set) {
1136                 pango_attr_list_insert(
1137                         list,
1138                         pango_attr_language_new( pango_language_from_string(string) )
1139                 );
1140         }
1141
1142         /* Font description updates the following properties simultaniously:
1143          * family, style, weight, variant, stretch, size.
1144          * FIXME: Except it doesn't really.
1145          */
1146         g_object_get(tag, "font-desc", &font_desc, NULL);
1147         pango_attr_list_insert(
1148                 list,
1149                 pango_attr_font_desc_new(font_desc)
1150         );
1151
1152         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1153         if(set) {
1154                 pango_attr_list_insert(
1155                         list,
1156                         pango_attr_strikethrough_new(strikethrough)
1157                 );
1158         }
1159         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1160         if(set) {
1161                 pango_attr_list_insert(
1162                         list,
1163                         pango_attr_underline_new(underline)
1164                 );
1165         }
1166 }
1167
1168 /* Update pager and reverse video tags */
1169 void
1170 style_update(ChimaraGlk *glk)
1171 {
1172         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1173
1174         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1175         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1176 }
1177
1178 /* Determine the current colors used to render the text for a given stream.
1179  * This can be set in a number of places */
1180 static void
1181 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1182 {
1183         gboolean foreground_set = FALSE;
1184         gboolean background_set = FALSE;
1185         gint reverse_color;
1186
1187         // Default color
1188         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1189         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1190         if(foreground_set)
1191                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1192         if(background_set)
1193                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1194
1195         // Player defined color
1196         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1197         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1198         if(foreground_set)
1199                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1200         if(background_set)
1201                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1202
1203         // GLK defined color
1204         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1205         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1206         if(foreground_set)
1207                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1208         if(background_set)
1209                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1210
1211 }
1212
1213 /* Determine the current colors used to render the text for a given stream.
1214  * This can be set in a number of places */
1215 void
1216 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1217 {
1218         VALID_STREAM(str, return);
1219         g_return_if_fail(str->window != NULL);
1220         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1221
1222         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1223         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1224         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1225         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1226         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1227
1228         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1229
1230         gboolean foreground_set, background_set;
1231
1232         // Windows can have zcolors defined
1233         if(str->window->zcolor) {
1234                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1235                 if(foreground_set)
1236                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1237                 if(background_set)
1238                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1239         }
1240 }