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_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  17 static void style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table);
  18 static void text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list);
  19 GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  20 static void style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background);
  21
  22 /**
  23  * glk_set_style:
  24  * @styl: The style to apply
  25  *
  26  * Changes the style of the current output stream. @styl should be one of the
  27  * <code>style_</code> constants. However, any value is actually legal; if the
  28  * interpreter does not recognize the style value, it will treat it as
  29  * %style_Normal.
  30  * <note><para>
  31  *  This policy allows for the future definition of styles without breaking old
  32  *  Glk libraries.
  33  * </para></note>
  34  */
  35 void
  36 glk_set_style(glui32 styl)
  37 {
  38         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  39         g_return_if_fail(glk_data->current_stream != NULL);
  40         glk_set_style_stream(glk_data->current_stream, styl);
  41 }
  42
  43 /* The first 11 tag names must correspond to the first 11 glk tag names as defined below */
  44 static const gchar* TAG_NAMES[] = {
  45         "normal",
  46         "emphasized",
  47         "preformatted",
  48         "header",
  49         "subheader",
  50         "alert",
  51         "note",
  52         "block-quote",
  53         "input",
  54         "user1",
  55         "user2",
  56         "hyperlink",
  57         "pager",
  58         "default"
  59 };
  60
  61 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
  62 static const gchar* GLK_TAG_NAMES[] = {
  63         "glk-normal",
  64         "glk-emphasized",
  65         "glk-preformatted",
  66         "glk-header",
  67         "glk-subheader",
  68         "glk-alert",
  69         "glk-note",
  70         "glk-block-quote",
  71         "glk-input",
  72         "glk-user1",
  73         "glk-user2"
  74 };
  75
  76 const gchar**
  77 style_get_tag_names()
  78 {
  79         return TAG_NAMES;
  80 }
  81
  82 /* Internal function: mapping from style enum to tag name */
  83 static const gchar*
  84 get_tag_name(glui32 style)
  85 {
  86         if(style >= CHIMARA_NUM_STYLES) {
  87                 WARNING("Unsupported style");
  88                 return "normal";
  89         } else {
  90                 return (gchar*) TAG_NAMES[style];
  91         }
  92 }
  93
  94 /* Internal function: mapping from glk style enum to tag name */
  95 static const gchar*
  96 get_glk_tag_name(glui32 style)
  97 {
  98         if(style >= style_NUMSTYLES) {
  99                 WARNING("Unsupported style");
 100                 return "normal";
 101         } else {
 102                 return (gchar*) GLK_TAG_NAMES[style];
 103         }
 104 }
 105
 106 /**
 107  * glk_set_style_stream:
 108  * @str: Output stream to change the style of
 109  * @styl: The style to apply
 110  *
 111  * This changes the style of the stream @str. See glk_set_style().
 112  */
 113 void
 114 glk_set_style_stream(strid_t str, glui32 styl) {
 115 #ifdef DEBUG_STYLES
 116         g_printf("glk_set_style(str->rock=%d, styl=%d)\n", str->rock, styl);
 117 #endif
 118
 119         if(str->window == NULL)
 120                 return;
 121
 122         flush_window_buffer(str->window);
 123         str->style = (gchar*) get_tag_name(styl);
 124         str->glk_style = (gchar*) get_glk_tag_name(styl);
 125 }
 126
 127 /* Internal function: call this to initialize the layout of the 'more' prompt. */
 128 void
 129 style_init_more_prompt(winid_t win)
 130 {
 131         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 132
 133         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
 134         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
 135 }
 136
 137 /* Internal function: call this to initialize the default styles to a textbuffer. */
 138 void
 139 style_init_textbuffer(GtkTextBuffer *buffer)
 140 {
 141         g_return_if_fail(buffer != NULL);
 142
 143         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 144
 145         /* Place the default text tags in the textbuffer's tag table */
 146         g_hash_table_foreach(glk_data->styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 147
 148         /* Copy the override text tags to the textbuffers's tag table */
 149         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 150 }
 151
 152
 153 /* Internal function: call this to initialize the default styles to a textgrid. */
 154 void
 155 style_init_textgrid(GtkTextBuffer *buffer)
 156 {
 157         g_return_if_fail(buffer != NULL);
 158
 159         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 160
 161         /* Place the default text tags in the textbuffer's tag table */
 162         g_hash_table_foreach(glk_data->styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 163
 164         /* Copy the current text tags to the textbuffers's tag table */
 165         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 166 }
 167
 168 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 169 static void
 170 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 171 {
 172         g_return_if_fail(key != NULL);
 173         g_return_if_fail(tag != NULL);
 174         g_return_if_fail(tag_table != NULL);
 175
 176         gtk_text_tag_table_add(tag_table, tag);
 177 }
 178
 179 /* Internal function used to iterate over a style table, copying it */
 180 static void
 181 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 182 {
 183         g_return_if_fail(key != NULL);
 184         g_return_if_fail(tag != NULL);
 185         g_return_if_fail(target_table != NULL);
 186
 187         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 188 }
 189
 190 /* Internal function that copies a text tag */
 191 GtkTextTag *
 192 gtk_text_tag_copy(GtkTextTag *tag)
 193 {
 194         GtkTextTag *copy;
 195
 196         g_return_val_if_fail(tag != NULL, NULL);
 197
 198         copy = gtk_text_tag_new(tag->name);
 199         gtk_text_attributes_copy_values(tag->values, copy->values);
 200
 201         #define _COPY_FLAG(flag) copy->flag = tag->flag
 202                 _COPY_FLAG (bg_color_set);
 203                 _COPY_FLAG (bg_color_set);
 204                 _COPY_FLAG (bg_stipple_set);
 205                 _COPY_FLAG (fg_color_set);
 206                 _COPY_FLAG (fg_stipple_set);
 207                 _COPY_FLAG (justification_set);
 208                 _COPY_FLAG (left_margin_set);
 209                 _COPY_FLAG (indent_set);
 210                 _COPY_FLAG (rise_set);
 211                 _COPY_FLAG (strikethrough_set);
 212                 _COPY_FLAG (right_margin_set);
 213                 _COPY_FLAG (pixels_above_lines_set);
 214                 _COPY_FLAG (pixels_below_lines_set);
 215                 _COPY_FLAG (pixels_inside_wrap_set);
 216                 _COPY_FLAG (tabs_set);
 217                 _COPY_FLAG (underline_set);
 218                 _COPY_FLAG (wrap_mode_set);
 219                 _COPY_FLAG (bg_full_height_set);
 220                 _COPY_FLAG (invisible_set);
 221                 _COPY_FLAG (editable_set);
 222                 _COPY_FLAG (language_set);
 223                 _COPY_FLAG (scale_set);
 224         #undef _COPY_FLAG
 225
 226         /* Copy the data that was added manually */
 227         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse-color" );
 228
 229         if(reverse_color) {
 230                 g_object_set_data( G_OBJECT(copy), "reverse-color", reverse_color );
 231         }
 232
 233         return copy;
 234 }
 235
 236 /* Internal function that constructs the default styles */
 237 void
 238 style_init(ChimaraGlk *glk)
 239 {
 240         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 241
 242         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 243         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 244         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 245         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 246         GtkTextTag *tag;
 247
 248         PangoFontDescription *default_font_desc = pango_font_description_from_string("Serif");
 249         PangoFontDescription *monospace_font_desc = pango_font_description_from_string("Monospace");
 250
 251         /* Initialise the default styles for a text grid */
 252         tag = gtk_text_tag_new("default");
 253         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 254         g_hash_table_insert(default_text_grid_styles, "default", tag);
 255
 256         tag = gtk_text_tag_new("normal");
 257         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 258         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 259
 260         tag = gtk_text_tag_new("emphasized");
 261         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 262         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 263         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 264
 265         tag = gtk_text_tag_new("preformatted");
 266         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 267         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 268
 269         tag = gtk_text_tag_new("header");
 270         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 271         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 272         g_hash_table_insert(default_text_grid_styles, "header", tag);
 273
 274         tag = gtk_text_tag_new("subheader");
 275         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 276         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 277         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 278
 279         tag = gtk_text_tag_new("alert");
 280         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 281         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 282         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 283
 284         tag = gtk_text_tag_new("note");
 285         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 286         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 287         g_hash_table_insert(default_text_grid_styles, "note", tag);
 288
 289         tag = gtk_text_tag_new("block-quote");
 290         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 291         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 292         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 293
 294         tag = gtk_text_tag_new("input");
 295         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 296         g_hash_table_insert(default_text_grid_styles, "input", tag);
 297
 298         tag = gtk_text_tag_new("user1");
 299         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 300         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 301
 302         tag = gtk_text_tag_new("user2");
 303         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 304         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 305
 306         tag = gtk_text_tag_new("hyperlink");
 307         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 308         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 309
 310         /* Initialise the default styles for a text buffer */
 311         tag = gtk_text_tag_new("default");
 312         g_object_set(tag, "font-desc", default_font_desc, NULL);
 313         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 314
 315         tag = gtk_text_tag_new("normal");
 316         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 317         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 318
 319         tag = gtk_text_tag_new("emphasized");
 320         //g_object_set(tag, "font-desc", default_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 321         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 322         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 323
 324         tag = gtk_text_tag_new("preformatted");
 325         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 326         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 327
 328         tag = gtk_text_tag_new("header");
 329         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 330         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 331         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 332
 333         tag = gtk_text_tag_new("subheader");
 334         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 335         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 336         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 337
 338         tag = gtk_text_tag_new("alert");
 339         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 340         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 341         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 342
 343         tag = gtk_text_tag_new("note");
 344         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 345         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 346         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 347
 348         tag = gtk_text_tag_new("block-quote");
 349         //g_object_set(tag, "font-desc", default_font_desc, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 350         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 351         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 352
 353         tag = gtk_text_tag_new("input");
 354         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 355         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 356
 357         tag = gtk_text_tag_new("user1");
 358         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 359         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 360
 361         tag = gtk_text_tag_new("user2");
 362         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 363         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 364
 365         tag = gtk_text_tag_new("hyperlink");
 366         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 367         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 368         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 369
 370         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 371         g_object_set(pager_tag, "font-desc", default_font_desc, "foreground", "#ffffff", "background", "#000000", NULL);
 372         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 373         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 374
 375         pango_font_description_free(default_font_desc);
 376         pango_font_description_free(monospace_font_desc);
 377
 378         priv->styles->text_grid = default_text_grid_styles;
 379         priv->styles->text_buffer = default_text_buffer_styles;
 380
 381
 382         /* Initialize the GLK styles to empty tags */
 383         int i;
 384         for(i=0; i<style_NUMSTYLES; i++) {
 385                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 386                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 387                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 388                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 389         }
 390
 391         priv->glk_styles->text_grid = glk_text_grid_styles;
 392         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 393
 394 }
 395
 396 /* Reset style tables to the library's internal defaults */
 397 void
 398 reset_default_styles(ChimaraGlk *glk)
 399 {
 400         /* TODO: write this function */
 401 }
 402
 403 /* Copy the default styles to the current styles
 404  FIXME: This function is temporary and will not be needed later on */
 405 void
 406 copy_default_styles_to_current_styles(ChimaraGlk *glk)
 407 {
 408         /*
 409         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 410         g_hash_table_foreach(priv->styles->text_grid, style_table_copy, priv->glk_styles->text_grid);
 411         g_hash_table_foreach(priv->styles->text_buffer, style_table_copy, priv->glk_styles->text_buffer);
 412
 413         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 414         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 415         */
 416 }
 417
 418 /* Create the CSS file scanner */
 419 GScanner *
 420 create_css_file_scanner(void)
 421 {
 422         GScanner *scanner = g_scanner_new(NULL);
 423         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 424         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 425         scanner->config->symbol_2_token = TRUE;
 426         scanner->config->cpair_comment_single = NULL;
 427         scanner->config->scan_float = FALSE;
 428         return scanner;
 429 }
 430
 431 /* Run the scanner over the CSS file, overriding the default styles */
 432 void
 433 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 434 {
 435         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 436
 437         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 438                 if( !style_accept_style_selector(scanner, glk) )
 439                         break;
 440         }
 441
 442         g_scanner_destroy(scanner);
 443
 444         /* Update the pager prompt to the new style */
 445         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 446         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 447 }
 448
 449 /* Internal function: parses a token */
 450 static gboolean
 451 style_accept(GScanner *scanner, GTokenType token)
 452 {
 453         GTokenType next = g_scanner_get_next_token(scanner);
 454         if(next != token) {
 455                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 456                 return FALSE;
 457         }
 458         return TRUE;
 459 }
 460
 461 /* Internal function: parses a style selector */
 462 static gboolean
 463 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 464 {
 465         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 466
 467         GtkTextTag *current_tag;
 468         gchar *field;
 469         GTokenType token = g_scanner_get_next_token(scanner);
 470         GTokenValue value = g_scanner_cur_value(scanner);
 471
 472         if(
 473                 token != G_TOKEN_IDENTIFIER ||
 474                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 475         ) {
 476                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 477                 return FALSE;
 478         }
 479
 480         field = g_strdup(value.v_identifier);
 481
 482         /* Parse the tag name to change */
 483         if( g_scanner_peek_next_token(scanner) == '{') {
 484                 style_accept(scanner, '{');
 485                 if( !strcmp(field, "buffer") )
 486                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 487                 else
 488                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 489         } else {
 490                 if( !style_accept(scanner, '.') )
 491                         return FALSE;
 492
 493                 token = g_scanner_get_next_token(scanner);
 494                 value = g_scanner_cur_value(scanner);
 495
 496                 if(token != G_TOKEN_IDENTIFIER) {
 497                         g_scanner_error(scanner, "CSS Error: style selector expected");
 498                         return FALSE;
 499                 }
 500
 501                 if( !strcmp(field, "buffer") )
 502                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 503                 else
 504                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 505
 506                 if(current_tag == NULL) {
 507                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 508                         return FALSE;
 509                 }
 510
 511                 if( !style_accept(scanner, '{') )
 512                         return FALSE;
 513         }
 514
 515         while( g_scanner_peek_next_token(scanner) != '}') {
 516                 if( !style_accept_style_hint(scanner, current_tag) )
 517                         return FALSE;
 518         }
 519
 520         if( !style_accept(scanner, '}') )
 521                 return FALSE;
 522
 523         return TRUE;
 524 }
 525
 526 /* Internal function: parses a style hint */
 527 static gboolean
 528 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 529 {
 530         GTokenType token = g_scanner_get_next_token(scanner);
 531         GTokenValue value = g_scanner_cur_value(scanner);
 532         gchar *hint;
 533
 534         if(token != G_TOKEN_IDENTIFIER) {
 535                 g_scanner_error(scanner, "CSS Error: style hint expected");
 536                 return FALSE;
 537         }
 538
 539         hint = g_strdup(value.v_identifier);
 540
 541         if( !style_accept(scanner, ':') )
 542                 return FALSE;
 543
 544         token = g_scanner_get_next_token(scanner);
 545         value = g_scanner_cur_value(scanner);
 546
 547         if( !strcmp(hint, "font-family") ) {
 548                 if(token != G_TOKEN_STRING) {
 549                         g_scanner_error(scanner, "CSS Error: string expected");
 550                         return FALSE;
 551                 }
 552                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 553         }
 554         else if( !strcmp(hint, "font-weight") ) {
 555                 if(token != G_TOKEN_IDENTIFIER) {
 556                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 557                         return FALSE;
 558                 }
 559
 560                 if( !strcmp(value.v_identifier, "bold") )
 561                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 562                 else if( !strcmp(value.v_identifier, "normal") )
 563                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 564                 else {
 565                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 566                         return FALSE;
 567                 }
 568         }
 569         else if( !strcmp(hint, "font-style") ) {
 570                 if(token != G_TOKEN_IDENTIFIER) {
 571                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 572                         return FALSE;
 573                 }
 574
 575                 if( !strcmp(value.v_identifier, "italic") )
 576                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 577                 else if( !strcmp(value.v_identifier, "normal") )
 578                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 579                 else {
 580                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 581                         return FALSE;
 582                 }
 583         }
 584         else if( !strcmp(hint, "font-size") ) {
 585                 if(token == G_TOKEN_INT)
 586                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 587                 else if(token == G_TOKEN_FLOAT)
 588                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 589                 else {
 590                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 591                         return FALSE;
 592                 }
 593         }
 594         else if( !strcmp(hint, "color") ) {
 595                 if(token != G_TOKEN_IDENTIFIER) {
 596                         g_scanner_error(scanner, "CSS Error: hex color expected");
 597                         return FALSE;
 598                 }
 599
 600                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 601         }
 602         else if( !strcmp(hint, "background-color") ) {
 603                 if(token != G_TOKEN_IDENTIFIER) {
 604                         g_scanner_error(scanner, "CSS Error: hex color expected");
 605                         return FALSE;
 606                 }
 607                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 608         }
 609         else if( !strcmp(hint, "text-align") ) {
 610                 if(token != G_TOKEN_IDENTIFIER) {
 611                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 612                         return FALSE;
 613                 }
 614
 615                 if( !strcmp(value.v_identifier, "left") )
 616                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 617                 else if( !strcmp(value.v_identifier, "right") )
 618                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 619                 else if( !strcmp(value.v_identifier, "center") )
 620                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 621                 else {
 622                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 623                         return FALSE;
 624                 }
 625         }
 626         else if( !strcmp(hint, "margin-left") ) {
 627                 if(token != G_TOKEN_INT) {
 628                         g_scanner_error(scanner, "CSS Error: integer expected");
 629                         return FALSE;
 630                 }
 631                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 632         }
 633         else if( !strcmp(hint, "margin-right") ) {
 634                 if(token != G_TOKEN_INT) {
 635                         g_scanner_error(scanner, "CSS Error: integer expected");
 636                         return FALSE;
 637                 }
 638                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 639         }
 640         else if( !strcmp(hint, "margin-top") ) {
 641                 if(token != G_TOKEN_INT) {
 642                         g_scanner_error(scanner, "CSS Error: integer expected");
 643                         return FALSE;
 644                 }
 645                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 646         }
 647         else if( !strcmp(hint, "margin-bottom") ) {
 648                 if(token != G_TOKEN_INT) {
 649                         g_scanner_error(scanner, "CSS Error: integer expected");
 650                         return FALSE;
 651                 }
 652                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 653         }
 654
 655         else {
 656                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 657                 return FALSE;
 658         }
 659
 660         if( !style_accept(scanner, ';') )
 661                 return FALSE;
 662
 663         return TRUE;
 664 }
 665
 666 /* Internal function: parses a glk color to a GdkColor */
 667 void
 668 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 669 {
 670         color->red = 256 * ((val & 0xff0000) >> 16);
 671         color->green = 256 * ((val & 0x00ff00) >> 8);
 672         color->blue = 256 * (val & 0x0000ff);
 673 }
 674
 675 /* Internal function: parses a GdkColor to a glk color */
 676 static glui32
 677 gdkcolor_to_glkcolor(GdkColor *color)
 678 {
 679         g_return_val_if_fail(color != NULL, 0);
 680         return (glui32) color->pixel;
 681 }
 682
 683 /* Internal function: changes a GTK tag to correspond with the given style. */
 684 static void
 685 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 686 {
 687         g_return_if_fail(tag != NULL);
 688
 689         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 690         GObject *tag_object = G_OBJECT(tag);
 691
 692         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 693
 694         int i = 0;
 695         GdkColor color;
 696         switch(hint) {
 697         case stylehint_Indentation:
 698                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 699                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 700                 break;
 701
 702         case stylehint_ParaIndentation:
 703                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 704                 break;
 705
 706         case stylehint_Justification:
 707                 switch(val) {
 708                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 709                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 710                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 711                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 712                         default:
 713                                 WARNING("Unknown justification");
 714                                 i = GTK_JUSTIFY_LEFT;
 715                 }
 716                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 717                 break;
 718
 719         case stylehint_Weight:
 720                 switch(val) {
 721                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 722                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 723                         case  1: i = PANGO_WEIGHT_BOLD; break;
 724                         default: WARNING("Unknown font weight");
 725                 }
 726                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 727                 break;
 728
 729         case stylehint_Size:
 730                 {
 731                         gdouble scale = PANGO_SCALE_MEDIUM;
 732                         switch(val) {
 733                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 734                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 735                                 case -1: scale = PANGO_SCALE_SMALL; break;
 736                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 737                                 case  1: scale = PANGO_SCALE_LARGE; break;
 738                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 739                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 740                                 default:
 741                                         /* We follow Pango's convention of having each magnification
 742                                         step be a scaling of 1.2 */
 743                                         scale = pow(1.2, (double)val);
 744                         }
 745                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 746                 }
 747                 break;
 748
 749         case stylehint_Oblique:
 750                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 751                 break;
 752
 753         case stylehint_Proportional:
 754         {
 755                 gchar *font_family;
 756                 GtkTextTag *font_tag = g_hash_table_lookup(
 757                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 758                     val? "default" : "preformatted");
 759                 g_object_get(font_tag, "family", &font_family, NULL);
 760                 g_object_set(tag_object, "family", font_family, "family-set", TRUE, NULL);
 761                 g_free(font_family);
 762         }
 763                 break;
 764
 765         case stylehint_TextColor:
 766                 glkcolor_to_gdkcolor(val, &color);
 767
 768                 if(!reverse_color)
 769                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 770                 else
 771                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 772
 773                 break;
 774
 775         case stylehint_BackColor:
 776                 glkcolor_to_gdkcolor(val, &color);
 777
 778                 if(!reverse_color)
 779                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 780                 else
 781                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 782
 783                 break;
 784
 785         case stylehint_ReverseColor:
 786         {
 787                 // Determine the current colors
 788
 789                 // If all fails, use black/white
 790                 // FIXME: Use system theme here
 791                 GdkColor foreground, background;
 792                 gdk_color_parse("black", &foreground);
 793                 gdk_color_parse("white", &background);
 794                 GdkColor *current_foreground = &foreground;
 795                 GdkColor *current_background = &background;
 796
 797                 if(wintype == wintype_TextBuffer) {
 798                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 799                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 800                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 801                 }
 802                 else if(wintype == wintype_TextGrid) {
 803                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 804                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 805                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 806                 }
 807
 808                 if(val) {
 809                         /* Flip the fore- and background colors */
 810                         GdkColor *temp = current_foreground;
 811                         current_foreground = current_background;
 812                         current_background = temp;
 813                 }
 814
 815                 g_object_set(tag,
 816                         "foreground-gdk", current_foreground,
 817                         "foreground-set", TRUE,
 818                         "background-gdk", current_background,
 819                         "background-set", TRUE,
 820                         NULL
 821                 );
 822
 823                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 824                 break;
 825         }
 826
 827         default:
 828                 WARNING("Unknown style hint");
 829         }
 830 }
 831
 832 /* Internal function: queries a text tag for the value of a given style hint */
 833 static gint
 834 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 835 {
 836         gint intval;
 837         gdouble doubleval;
 838         GdkColor *colval;
 839
 840         g_return_val_if_fail(tag != NULL, 0);
 841
 842         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 843
 844         switch(hint) {
 845         case stylehint_Indentation:
 846                 g_object_get(tag, "left_margin", &intval, NULL);
 847                 return intval/5;
 848
 849         case stylehint_ParaIndentation:
 850                 g_object_get(tag, "indent", &intval, NULL);
 851                 return intval/5;
 852
 853         case stylehint_Justification:
 854                 g_object_get(tag, "justification", &intval, NULL);
 855                 switch(intval) {
 856                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 857                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 858                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 859                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 860                         default:
 861                                 WARNING("Unknown justification");
 862                                 return stylehint_just_LeftFlush;
 863                 }
 864
 865         case stylehint_Weight:
 866                 g_object_get(tag, "weight", &intval, NULL);
 867                 switch(intval) {
 868                         case PANGO_WEIGHT_LIGHT: return -1;
 869                         case PANGO_WEIGHT_NORMAL: return 0;
 870                         case PANGO_WEIGHT_BOLD: return 1;
 871                         default: WARNING("Unknown font weight"); return 0;
 872                 }
 873
 874         case stylehint_Size:
 875                 g_object_get(tag, "scale", &doubleval, NULL);
 876                 return (gint)round(log(doubleval) / log(1.2));
 877
 878         case stylehint_Oblique:
 879                 g_object_get(tag, "style", &intval , NULL);
 880                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 881
 882         case stylehint_Proportional:
 883                 /* Use pango_font_family_is_monospace()? */
 884         {
 885                 gchar *font_family, *query_font_family;
 886                 GtkTextTag *font_tag = g_hash_table_lookup(
 887                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 888                     "preformatted");
 889                 g_object_get(font_tag, "family", &font_family, NULL);
 890                 g_object_get(tag, "family", &query_font_family, NULL);
 891                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 892                 g_free(font_family);
 893                 g_free(query_font_family);
 894                 return retval;
 895         }
 896
 897         case stylehint_TextColor:
 898                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 899                 return gdkcolor_to_glkcolor(colval);
 900
 901         case stylehint_BackColor:
 902                 g_object_get(tag, "background-gdk", &colval, NULL);
 903                 return gdkcolor_to_glkcolor(colval);
 904
 905         case stylehint_ReverseColor:
 906                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 907
 908         default:
 909                 WARNING("Unknown style hint");
 910         }
 911
 912         return 0;
 913 }
 914
 915 /**
 916  * glk_stylehint_set:
 917  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 918  * @styl: The style to set a hint for.
 919  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 920  * @val: The style hint. The meaning of this depends on @hint.
 921  *
 922  * Sets a hint about the appearance of one style for a particular type of
 923  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 924  * all types of window.
 925  * <note><para>
 926  *  There is no equivalent constant to set a hint for all styles of a single
 927  *  window type.
 928  * </para></note>
 929  */
 930 void
 931 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 932 {
 933 #ifdef DEBUG_STYLES
 934         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 935 #endif
 936
 937         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 938
 939         GtkTextTag *to_change;
 940         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 941                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 942                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 943         }
 944
 945         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 946                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 947                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 948         }
 949 }
 950
 951 /**
 952  * glk_stylehint_clear:
 953  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 954  * @styl: The style to set a hint for.
 955  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 956  *
 957  * Clears a hint about the appearance of one style for a particular type of
 958  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 959  * which clears a hint for all types of window.
 960  * <note><para>
 961  *  There is no equivalent constant to reset a hint for all styles of a single
 962  *  window type.
 963  * </para></note>
 964  */
 965 void
 966 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 967 {
 968 #ifdef DEBUG_STYLES
 969         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 970 #endif
 971
 972         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 973         GtkTextTag *tag;
 974
 975         switch(wintype) {
 976         case wintype_TextBuffer:
 977                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 978                 if(tag) {
 979                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 980                 }
 981                 break;
 982         case wintype_TextGrid:
 983                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 984                 if(tag) {
 985                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 986                 }
 987         default:
 988                 return;
 989         }
 990 }
 991
 992 /**
 993  * glk_style_distinguish:
 994  * @win: The window in which the styles are to be distinguished.
 995  * @styl1: The first style to be distinguished from the second style.
 996  * @styl2: The second style to be distinguished from the first style.
 997  *
 998  * Decides whether two styles are visually distinguishable in the given window.
 999  * The exact meaning of this is left for the library to determine.
1000  * <note><title>Chimara</title><para>
1001  *   Currently, all styles of one window are assumed to be mutually
1002  *   distinguishable.
1003  * </para></note>
1004  *
1005  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
1006  * are not, it returns %FALSE (0).
1007  */
1008 glui32
1009 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
1010 {
1011 #ifdef DEBUG_STYLES
1012         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
1013 #endif
1014
1015         /* FIXME */
1016         return styl1 != styl2;
1017 }
1018
1019 /**
1020  * glk_style_measure:
1021  * @win: The window from which to take the style.
1022  * @styl: The style to perform the measurement on.
1023  * @hint: The stylehint to measure.
1024  * @result: Address to write the result to.
1025  *
1026  * Tries to test an attribute of one style in the given window @win. The library
1027  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1028  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1029  * at by @result.
1030  * <note><para>
1031  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1032  * </para></note>
1033  *
1034  * The meaning of the value depends on the hint which was tested:
1035  * <variablelist>
1036  * <varlistentry>
1037  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1038  *   <listitem><para>The indentation and paragraph indentation. These are in a
1039  *   metric which is platform-dependent.</para>
1040  *   <note><para>Most likely either characters or pixels.</para></note>
1041  *   </listitem>
1042  * </varlistentry>
1043  * <varlistentry>
1044  *   <term>%stylehint_Justification</term>
1045  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1046  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1047  *   %stylehint_just_RightFlush.</para></listitem>
1048  * </varlistentry>
1049  * <varlistentry>
1050  *   <term>%stylehint_Size</term>
1051  *   <listitem><para>The font size. Again, this is in a platform-dependent
1052  *   metric.</para>
1053  *   <note><para>Pixels, points, or simply 1 if the library does not support
1054  *   varying font sizes.</para></note>
1055  *   </listitem>
1056  * </varlistentry>
1057  * <varlistentry>
1058  *   <term>%stylehint_Weight</term>
1059  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1060  *   and -1 for light-weight fonts.</para></listitem>
1061  * </varlistentry>
1062  * <varlistentry>
1063  *   <term>%stylehint_Oblique</term>
1064  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1065  *   </listitem>
1066  * </varlistentry>
1067  * <varlistentry>
1068  *   <term>%stylehint_Proportional</term>
1069  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1070  *   </para></listitem>
1071  * </varlistentry>
1072  * <varlistentry>
1073  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1074  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1075  *   described in <link
1076  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1077  *   Appearance of Styles</link>.</para></listitem>
1078  * </varlistentry>
1079  * <varlistentry>
1080  *   <term>%stylehint_ReverseColor</term>
1081  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1082  *   colors are reversed.</para></listitem>
1083  * </varlistentry>
1084  * </variablelist>
1085  *
1086  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1087  */
1088 glui32
1089 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1090 {
1091 #ifdef DEBUG_STYLES
1092         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1093 #endif
1094
1095         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1096         GtkTextTag *tag;
1097
1098         switch(win->type) {
1099         case wintype_TextBuffer:
1100                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1101                 if(result)
1102                         *result = query_tag(tag, win->type, hint);
1103                 break;
1104         case wintype_TextGrid:
1105                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1106                 if(result)
1107                         *result = query_tag(tag, win->type, hint);
1108         default:
1109                 return FALSE;
1110         }
1111
1112         return TRUE;
1113 }
1114
1115 /* Internal function returning the current default font for a window type
1116  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1117  * supported for now */
1118 PangoFontDescription *
1119 get_current_font(guint32 wintype)
1120 {
1121         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1122         GtkTextTag *tag;
1123
1124         switch(wintype) {
1125         case wintype_TextGrid:
1126                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1127                 break;
1128         case wintype_TextBuffer:
1129                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1130                 break;
1131         default:
1132                 return NULL;
1133         }
1134
1135         PangoFontDescription *font;
1136         g_object_get( G_OBJECT(tag), "font-desc", &font, NULL );
1137
1138         return font;
1139 }
1140
1141 /* Internal function copying the attributes of a text tag to a pango attribute list */
1142 static void
1143 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1144 {
1145         gboolean set;
1146         GdkColor *foreground, *background;
1147         gchar *string;
1148         PangoFontDescription *font_desc;
1149         gboolean strikethrough;
1150         PangoUnderline underline;
1151
1152         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1153         if(set) {
1154                 pango_attr_list_insert(
1155                         list,
1156                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1157                 );
1158         }
1159         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1160         if(set) {
1161                 pango_attr_list_insert(
1162                         list,
1163                         pango_attr_background_new(background->red, background->green, background->blue)
1164                 );
1165         }
1166         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1167         if(set) {
1168                 pango_attr_list_insert(
1169                         list,
1170                         pango_attr_language_new( pango_language_from_string(string) )
1171                 );
1172         }
1173
1174         /* Font description updates the following properties simultaniously:
1175          * family, style, weight, variant, stretch, size
1176          */
1177         g_object_get(tag, "font-desc", &font_desc, NULL);
1178         pango_attr_list_insert(
1179                 list,
1180                 pango_attr_font_desc_new(font_desc)
1181         );
1182
1183         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1184         if(set) {
1185                 pango_attr_list_insert(
1186                         list,
1187                         pango_attr_strikethrough_new(strikethrough)
1188                 );
1189         }
1190         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1191         if(set) {
1192                 pango_attr_list_insert(
1193                         list,
1194                         pango_attr_underline_new(underline)
1195                 );
1196         }
1197 }
1198
1199 /* Update pager and reverse video tags */
1200 void
1201 style_update(ChimaraGlk *glk)
1202 {
1203         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1204
1205         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1206         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1207 }
1208
1209 /* Determine the current colors used to render the text for a given stream.
1210  * This can be set in a number of places */
1211 static void
1212 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1213 {
1214         gboolean foreground_set = FALSE;
1215         gboolean background_set = FALSE;
1216         gint reverse_color;
1217
1218         // Default color
1219         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1220         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1221         if(foreground_set)
1222                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1223         if(background_set)
1224                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1225
1226         // Player defined color
1227         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1228         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1229         if(foreground_set)
1230                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1231         if(background_set)
1232                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1233
1234         // GLK defined color
1235         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1236         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1237         if(foreground_set)
1238                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1239         if(background_set)
1240                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1241
1242 }
1243
1244 /* Determine the current colors used to render the text for a given stream.
1245  * This can be set in a number of places */
1246 void
1247 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1248 {
1249         VALID_STREAM(str, return);
1250         g_return_if_fail(str->window != NULL);
1251         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1252
1253         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1254         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1255         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1256         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1257         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1258
1259         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1260
1261         gboolean foreground_set, background_set;
1262
1263         // Windows can have zcolors defined
1264         if(str->window->zcolor) {
1265                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1266                 if(foreground_set)
1267                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1268                 if(background_set)
1269                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1270         }
1271 }