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         PangoFontDescription *default_font_desc = pango_font_description_from_string("Serif");
 237         PangoFontDescription *monospace_font_desc = pango_font_description_from_string("Monospace");
 238
 239         /* Initialise the default styles for a text grid */
 240         tag = gtk_text_tag_new("default");
 241         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 242         g_hash_table_insert(default_text_grid_styles, "default", tag);
 243
 244         tag = gtk_text_tag_new("normal");
 245         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 246         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 247
 248         tag = gtk_text_tag_new("emphasized");
 249         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 250         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 251         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 252
 253         tag = gtk_text_tag_new("preformatted");
 254         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 255         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 256
 257         tag = gtk_text_tag_new("header");
 258         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 259         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 260         g_hash_table_insert(default_text_grid_styles, "header", tag);
 261
 262         tag = gtk_text_tag_new("subheader");
 263         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 264         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 265         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 266
 267         tag = gtk_text_tag_new("alert");
 268         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 269         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 270         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 271
 272         tag = gtk_text_tag_new("note");
 273         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 274         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 275         g_hash_table_insert(default_text_grid_styles, "note", tag);
 276
 277         tag = gtk_text_tag_new("block-quote");
 278         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 279         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 280         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 281
 282         tag = gtk_text_tag_new("input");
 283         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 284         g_hash_table_insert(default_text_grid_styles, "input", tag);
 285
 286         tag = gtk_text_tag_new("user1");
 287         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 288         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 289
 290         tag = gtk_text_tag_new("user2");
 291         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 292         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 293
 294         tag = gtk_text_tag_new("hyperlink");
 295         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 296         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 297
 298         /* Initialise the default styles for a text buffer */
 299         tag = gtk_text_tag_new("default");
 300         g_object_set(tag, "font-desc", default_font_desc, NULL);
 301         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 302
 303         tag = gtk_text_tag_new("normal");
 304         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 305         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 306
 307         tag = gtk_text_tag_new("emphasized");
 308         //g_object_set(tag, "font-desc", default_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 309         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 310         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 311
 312         tag = gtk_text_tag_new("preformatted");
 313         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 314         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 315
 316         tag = gtk_text_tag_new("header");
 317         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 318         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 319         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 320
 321         tag = gtk_text_tag_new("subheader");
 322         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 323         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 324         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 325
 326         tag = gtk_text_tag_new("alert");
 327         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 328         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 329         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 330
 331         tag = gtk_text_tag_new("note");
 332         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 333         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 334         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 335
 336         tag = gtk_text_tag_new("block-quote");
 337         //g_object_set(tag, "font-desc", default_font_desc, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 338         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 339         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 340
 341         tag = gtk_text_tag_new("input");
 342         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 343         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 344
 345         tag = gtk_text_tag_new("user1");
 346         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 347         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 348
 349         tag = gtk_text_tag_new("user2");
 350         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 351         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 352
 353         tag = gtk_text_tag_new("hyperlink");
 354         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 355         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 356         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 357
 358         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 359         g_object_set(pager_tag, "font-desc", default_font_desc, "foreground", "#ffffff", "background", "#000000", NULL);
 360         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 361         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 362
 363         pango_font_description_free(default_font_desc);
 364         pango_font_description_free(monospace_font_desc);
 365
 366         priv->styles->text_grid = default_text_grid_styles;
 367         priv->styles->text_buffer = default_text_buffer_styles;
 368
 369
 370         /* Initialize the GLK styles to empty tags */
 371         int i;
 372         for(i=0; i<style_NUMSTYLES; i++) {
 373                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 374                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 375                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 376                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 377         }
 378
 379         priv->glk_styles->text_grid = glk_text_grid_styles;
 380         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 381
 382 }
 383
 384 /* Reset style tables to the library's internal defaults */
 385 void
 386 reset_default_styles(ChimaraGlk *glk)
 387 {
 388         /* TODO: write this function */
 389 }
 390
 391 /* Create the CSS file scanner */
 392 GScanner *
 393 create_css_file_scanner(void)
 394 {
 395         GScanner *scanner = g_scanner_new(NULL);
 396         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 397         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 398         scanner->config->symbol_2_token = TRUE;
 399         scanner->config->cpair_comment_single = NULL;
 400         scanner->config->scan_float = FALSE;
 401         return scanner;
 402 }
 403
 404 /* Run the scanner over the CSS file, overriding the default styles */
 405 void
 406 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 407 {
 408         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 409
 410         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 411                 if( !style_accept_style_selector(scanner, glk) )
 412                         break;
 413         }
 414
 415         g_scanner_destroy(scanner);
 416
 417         /* Update the pager prompt to the new style */
 418         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 419         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 420 }
 421
 422 /* Internal function: parses a token */
 423 static gboolean
 424 style_accept(GScanner *scanner, GTokenType token)
 425 {
 426         GTokenType next = g_scanner_get_next_token(scanner);
 427         if(next != token) {
 428                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 429                 return FALSE;
 430         }
 431         return TRUE;
 432 }
 433
 434 /* Internal function: parses a style selector */
 435 static gboolean
 436 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 437 {
 438         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 439
 440         GtkTextTag *current_tag;
 441         gchar *field;
 442         GTokenType token = g_scanner_get_next_token(scanner);
 443         GTokenValue value = g_scanner_cur_value(scanner);
 444
 445         if(
 446                 token != G_TOKEN_IDENTIFIER ||
 447                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 448         ) {
 449                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 450                 return FALSE;
 451         }
 452
 453         field = g_strdup(value.v_identifier);
 454
 455         /* Parse the tag name to change */
 456         if( g_scanner_peek_next_token(scanner) == '{') {
 457                 style_accept(scanner, '{');
 458                 if( !strcmp(field, "buffer") )
 459                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 460                 else
 461                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 462         } else {
 463                 if( !style_accept(scanner, '.') )
 464                         return FALSE;
 465
 466                 token = g_scanner_get_next_token(scanner);
 467                 value = g_scanner_cur_value(scanner);
 468
 469                 if(token != G_TOKEN_IDENTIFIER) {
 470                         g_scanner_error(scanner, "CSS Error: style selector expected");
 471                         return FALSE;
 472                 }
 473
 474                 if( !strcmp(field, "buffer") )
 475                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 476                 else
 477                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 478
 479                 if(current_tag == NULL) {
 480                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 481                         return FALSE;
 482                 }
 483
 484                 if( !style_accept(scanner, '{') )
 485                         return FALSE;
 486         }
 487
 488         while( g_scanner_peek_next_token(scanner) != '}') {
 489                 if( !style_accept_style_hint(scanner, current_tag) )
 490                         return FALSE;
 491         }
 492
 493         if( !style_accept(scanner, '}') )
 494                 return FALSE;
 495
 496         return TRUE;
 497 }
 498
 499 /* Internal function: parses a style hint */
 500 static gboolean
 501 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 502 {
 503         GTokenType token = g_scanner_get_next_token(scanner);
 504         GTokenValue value = g_scanner_cur_value(scanner);
 505         gchar *hint;
 506
 507         if(token != G_TOKEN_IDENTIFIER) {
 508                 g_scanner_error(scanner, "CSS Error: style hint expected");
 509                 return FALSE;
 510         }
 511
 512         hint = g_strdup(value.v_identifier);
 513
 514         if( !style_accept(scanner, ':') )
 515                 return FALSE;
 516
 517         token = g_scanner_get_next_token(scanner);
 518         value = g_scanner_cur_value(scanner);
 519
 520         if( !strcmp(hint, "font-family") ) {
 521                 if(token != G_TOKEN_STRING) {
 522                         g_scanner_error(scanner, "CSS Error: string expected");
 523                         return FALSE;
 524                 }
 525                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 526         }
 527         else if( !strcmp(hint, "font-weight") ) {
 528                 if(token != G_TOKEN_IDENTIFIER) {
 529                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 530                         return FALSE;
 531                 }
 532
 533                 if( !strcmp(value.v_identifier, "bold") )
 534                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 535                 else if( !strcmp(value.v_identifier, "normal") )
 536                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 537                 else {
 538                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 539                         return FALSE;
 540                 }
 541         }
 542         else if( !strcmp(hint, "font-style") ) {
 543                 if(token != G_TOKEN_IDENTIFIER) {
 544                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 545                         return FALSE;
 546                 }
 547
 548                 if( !strcmp(value.v_identifier, "italic") )
 549                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 550                 else if( !strcmp(value.v_identifier, "normal") )
 551                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 552                 else {
 553                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 554                         return FALSE;
 555                 }
 556         }
 557         else if( !strcmp(hint, "font-size") ) {
 558                 if(token == G_TOKEN_INT)
 559                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 560                 else if(token == G_TOKEN_FLOAT)
 561                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 562                 else {
 563                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 564                         return FALSE;
 565                 }
 566         }
 567         else if( !strcmp(hint, "color") ) {
 568                 if(token != G_TOKEN_IDENTIFIER) {
 569                         g_scanner_error(scanner, "CSS Error: hex color expected");
 570                         return FALSE;
 571                 }
 572
 573                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 574         }
 575         else if( !strcmp(hint, "background-color") ) {
 576                 if(token != G_TOKEN_IDENTIFIER) {
 577                         g_scanner_error(scanner, "CSS Error: hex color expected");
 578                         return FALSE;
 579                 }
 580                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 581         }
 582         else if( !strcmp(hint, "text-align") ) {
 583                 if(token != G_TOKEN_IDENTIFIER) {
 584                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 585                         return FALSE;
 586                 }
 587
 588                 if( !strcmp(value.v_identifier, "left") )
 589                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 590                 else if( !strcmp(value.v_identifier, "right") )
 591                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 592                 else if( !strcmp(value.v_identifier, "center") )
 593                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 594                 else {
 595                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 596                         return FALSE;
 597                 }
 598         }
 599         else if( !strcmp(hint, "margin-left") ) {
 600                 if(token != G_TOKEN_INT) {
 601                         g_scanner_error(scanner, "CSS Error: integer expected");
 602                         return FALSE;
 603                 }
 604                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 605         }
 606         else if( !strcmp(hint, "margin-right") ) {
 607                 if(token != G_TOKEN_INT) {
 608                         g_scanner_error(scanner, "CSS Error: integer expected");
 609                         return FALSE;
 610                 }
 611                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 612         }
 613         else if( !strcmp(hint, "margin-top") ) {
 614                 if(token != G_TOKEN_INT) {
 615                         g_scanner_error(scanner, "CSS Error: integer expected");
 616                         return FALSE;
 617                 }
 618                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 619         }
 620         else if( !strcmp(hint, "margin-bottom") ) {
 621                 if(token != G_TOKEN_INT) {
 622                         g_scanner_error(scanner, "CSS Error: integer expected");
 623                         return FALSE;
 624                 }
 625                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 626         }
 627
 628         else {
 629                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 630                 return FALSE;
 631         }
 632
 633         if( !style_accept(scanner, ';') )
 634                 return FALSE;
 635
 636         return TRUE;
 637 }
 638
 639 /* Internal function: parses a glk color to a GdkColor */
 640 void
 641 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 642 {
 643         color->red = 256 * ((val & 0xff0000) >> 16);
 644         color->green = 256 * ((val & 0x00ff00) >> 8);
 645         color->blue = 256 * (val & 0x0000ff);
 646 }
 647
 648 /* Internal function: parses a glk color to a hex string */
 649 gchar*
 650 glkcolor_to_hex(glui32 val)
 651 {
 652         return g_strdup_printf("%04X%04X%04X",
 653                 256 * ((val & 0xff0000) >> 16),
 654                 256 * ((val & 0x00ff00) >> 8),
 655                 256 * (val & 0x0000ff)
 656         );
 657 }
 658
 659 /* Internal function: parses a gdk color to a hex string */
 660 gchar*
 661 gdkcolor_to_hex(GdkColor *color)
 662 {
 663         return g_strdup_printf("%04X%04X%04X",
 664                 color->red, color->green, color->blue
 665         );
 666 }
 667
 668 /* Internal function: parses a GdkColor to a glk color */
 669 static glui32
 670 gdkcolor_to_glkcolor(GdkColor *color)
 671 {
 672         g_return_val_if_fail(color != NULL, 0);
 673         return (glui32) color->pixel;
 674 }
 675
 676 /* Internal function: changes a GTK tag to correspond with the given style. */
 677 static void
 678 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 679 {
 680         g_return_if_fail(tag != NULL);
 681
 682         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 683         GObject *tag_object = G_OBJECT(tag);
 684
 685         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 686
 687         int i = 0;
 688         GdkColor color;
 689         switch(hint) {
 690         case stylehint_Indentation:
 691                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 692                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 693                 break;
 694
 695         case stylehint_ParaIndentation:
 696                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 697                 break;
 698
 699         case stylehint_Justification:
 700                 switch(val) {
 701                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 702                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 703                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 704                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 705                         default:
 706                                 WARNING("Unknown justification");
 707                                 i = GTK_JUSTIFY_LEFT;
 708                 }
 709                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 710                 break;
 711
 712         case stylehint_Weight:
 713                 switch(val) {
 714                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 715                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 716                         case  1: i = PANGO_WEIGHT_BOLD; break;
 717                         default: WARNING("Unknown font weight");
 718                 }
 719                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 720                 break;
 721
 722         case stylehint_Size:
 723                 {
 724                         gdouble scale = PANGO_SCALE_MEDIUM;
 725                         switch(val) {
 726                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 727                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 728                                 case -1: scale = PANGO_SCALE_SMALL; break;
 729                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 730                                 case  1: scale = PANGO_SCALE_LARGE; break;
 731                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 732                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 733                                 default:
 734                                         /* We follow Pango's convention of having each magnification
 735                                         step be a scaling of 1.2 */
 736                                         scale = pow(1.2, (double)val);
 737                         }
 738                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 739                 }
 740                 break;
 741
 742         case stylehint_Oblique:
 743                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 744                 break;
 745
 746         case stylehint_Proportional:
 747         {
 748                 gchar *font_family;
 749                 GtkTextTag *font_tag = g_hash_table_lookup(
 750                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 751                     val? "default" : "preformatted");
 752                 g_object_get(font_tag, "family", &font_family, NULL);
 753                 g_object_set(tag_object, "family", font_family, "family-set", TRUE, NULL);
 754                 g_free(font_family);
 755         }
 756                 break;
 757
 758         case stylehint_TextColor:
 759                 glkcolor_to_gdkcolor(val, &color);
 760
 761                 if(!reverse_color)
 762                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 763                 else
 764                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 765
 766                 break;
 767
 768         case stylehint_BackColor:
 769                 glkcolor_to_gdkcolor(val, &color);
 770
 771                 if(!reverse_color)
 772                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 773                 else
 774                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 775
 776                 break;
 777
 778         case stylehint_ReverseColor:
 779         {
 780                 // Determine the current colors
 781
 782                 // If all fails, use black/white
 783                 // FIXME: Use system theme here
 784                 GdkColor foreground, background;
 785                 gdk_color_parse("black", &foreground);
 786                 gdk_color_parse("white", &background);
 787                 GdkColor *current_foreground = &foreground;
 788                 GdkColor *current_background = &background;
 789
 790                 if(wintype == wintype_TextBuffer) {
 791                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 792                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 793                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 794                 }
 795                 else if(wintype == wintype_TextGrid) {
 796                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 797                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 798                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 799                 }
 800
 801                 if(val) {
 802                         /* Flip the fore- and background colors */
 803                         GdkColor *temp = current_foreground;
 804                         current_foreground = current_background;
 805                         current_background = temp;
 806                 }
 807
 808                 g_object_set(tag,
 809                         "foreground-gdk", current_foreground,
 810                         "foreground-set", TRUE,
 811                         "background-gdk", current_background,
 812                         "background-set", TRUE,
 813                         NULL
 814                 );
 815
 816                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 817                 break;
 818         }
 819
 820         default:
 821                 WARNING("Unknown style hint");
 822         }
 823 }
 824
 825 /* Internal function: queries a text tag for the value of a given style hint */
 826 static gint
 827 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 828 {
 829         gint intval;
 830         gdouble doubleval;
 831         GdkColor *colval;
 832
 833         g_return_val_if_fail(tag != NULL, 0);
 834
 835         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 836
 837         switch(hint) {
 838         case stylehint_Indentation:
 839                 g_object_get(tag, "left_margin", &intval, NULL);
 840                 return intval/5;
 841
 842         case stylehint_ParaIndentation:
 843                 g_object_get(tag, "indent", &intval, NULL);
 844                 return intval/5;
 845
 846         case stylehint_Justification:
 847                 g_object_get(tag, "justification", &intval, NULL);
 848                 switch(intval) {
 849                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 850                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 851                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 852                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 853                         default:
 854                                 WARNING("Unknown justification");
 855                                 return stylehint_just_LeftFlush;
 856                 }
 857
 858         case stylehint_Weight:
 859                 g_object_get(tag, "weight", &intval, NULL);
 860                 switch(intval) {
 861                         case PANGO_WEIGHT_LIGHT: return -1;
 862                         case PANGO_WEIGHT_NORMAL: return 0;
 863                         case PANGO_WEIGHT_BOLD: return 1;
 864                         default: WARNING("Unknown font weight"); return 0;
 865                 }
 866
 867         case stylehint_Size:
 868                 g_object_get(tag, "scale", &doubleval, NULL);
 869                 return (gint)round(log(doubleval) / log(1.2));
 870
 871         case stylehint_Oblique:
 872                 g_object_get(tag, "style", &intval , NULL);
 873                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 874
 875         case stylehint_Proportional:
 876                 /* Use pango_font_family_is_monospace()? */
 877         {
 878                 gchar *font_family, *query_font_family;
 879                 GtkTextTag *font_tag = g_hash_table_lookup(
 880                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 881                     "preformatted");
 882                 g_object_get(font_tag, "family", &font_family, NULL);
 883                 g_object_get(tag, "family", &query_font_family, NULL);
 884                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 885                 g_free(font_family);
 886                 g_free(query_font_family);
 887                 return retval;
 888         }
 889
 890         case stylehint_TextColor:
 891                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 892                 return gdkcolor_to_glkcolor(colval);
 893
 894         case stylehint_BackColor:
 895                 g_object_get(tag, "background-gdk", &colval, NULL);
 896                 return gdkcolor_to_glkcolor(colval);
 897
 898         case stylehint_ReverseColor:
 899                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 900
 901         default:
 902                 WARNING("Unknown style hint");
 903         }
 904
 905         return 0;
 906 }
 907
 908 /**
 909  * glk_stylehint_set:
 910  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 911  * @styl: The style to set a hint for.
 912  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 913  * @val: The style hint. The meaning of this depends on @hint.
 914  *
 915  * Sets a hint about the appearance of one style for a particular type of
 916  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 917  * all types of window.
 918  * <note><para>
 919  *  There is no equivalent constant to set a hint for all styles of a single
 920  *  window type.
 921  * </para></note>
 922  */
 923 void
 924 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 925 {
 926 #ifdef DEBUG_STYLES
 927         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 928 #endif
 929
 930         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 931
 932         GtkTextTag *to_change;
 933         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 934                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 935                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 936         }
 937
 938         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 939                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 940                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 941         }
 942 }
 943
 944 /**
 945  * glk_stylehint_clear:
 946  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 947  * @styl: The style to set a hint for.
 948  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 949  *
 950  * Clears a hint about the appearance of one style for a particular type of
 951  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 952  * which clears a hint for all types of window.
 953  * <note><para>
 954  *  There is no equivalent constant to reset a hint for all styles of a single
 955  *  window type.
 956  * </para></note>
 957  */
 958 void
 959 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 960 {
 961 #ifdef DEBUG_STYLES
 962         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 963 #endif
 964
 965         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 966         GtkTextTag *tag;
 967
 968         switch(wintype) {
 969         case wintype_TextBuffer:
 970                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 971                 if(tag) {
 972                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 973                 }
 974                 break;
 975         case wintype_TextGrid:
 976                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 977                 if(tag) {
 978                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 979                 }
 980         default:
 981                 return;
 982         }
 983 }
 984
 985 /**
 986  * glk_style_distinguish:
 987  * @win: The window in which the styles are to be distinguished.
 988  * @styl1: The first style to be distinguished from the second style.
 989  * @styl2: The second style to be distinguished from the first style.
 990  *
 991  * Decides whether two styles are visually distinguishable in the given window.
 992  * The exact meaning of this is left for the library to determine.
 993  * <note><title>Chimara</title><para>
 994  *   Currently, all styles of one window are assumed to be mutually
 995  *   distinguishable.
 996  * </para></note>
 997  *
 998  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 999  * are not, it returns %FALSE (0).
1000  */
1001 glui32
1002 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
1003 {
1004 #ifdef DEBUG_STYLES
1005         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
1006 #endif
1007
1008         /* FIXME */
1009         return styl1 != styl2;
1010 }
1011
1012 /**
1013  * glk_style_measure:
1014  * @win: The window from which to take the style.
1015  * @styl: The style to perform the measurement on.
1016  * @hint: The stylehint to measure.
1017  * @result: Address to write the result to.
1018  *
1019  * Tries to test an attribute of one style in the given window @win. The library
1020  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1021  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1022  * at by @result.
1023  * <note><para>
1024  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1025  * </para></note>
1026  *
1027  * The meaning of the value depends on the hint which was tested:
1028  * <variablelist>
1029  * <varlistentry>
1030  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1031  *   <listitem><para>The indentation and paragraph indentation. These are in a
1032  *   metric which is platform-dependent.</para>
1033  *   <note><para>Most likely either characters or pixels.</para></note>
1034  *   </listitem>
1035  * </varlistentry>
1036  * <varlistentry>
1037  *   <term>%stylehint_Justification</term>
1038  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1039  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1040  *   %stylehint_just_RightFlush.</para></listitem>
1041  * </varlistentry>
1042  * <varlistentry>
1043  *   <term>%stylehint_Size</term>
1044  *   <listitem><para>The font size. Again, this is in a platform-dependent
1045  *   metric.</para>
1046  *   <note><para>Pixels, points, or simply 1 if the library does not support
1047  *   varying font sizes.</para></note>
1048  *   </listitem>
1049  * </varlistentry>
1050  * <varlistentry>
1051  *   <term>%stylehint_Weight</term>
1052  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1053  *   and -1 for light-weight fonts.</para></listitem>
1054  * </varlistentry>
1055  * <varlistentry>
1056  *   <term>%stylehint_Oblique</term>
1057  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1058  *   </listitem>
1059  * </varlistentry>
1060  * <varlistentry>
1061  *   <term>%stylehint_Proportional</term>
1062  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1063  *   </para></listitem>
1064  * </varlistentry>
1065  * <varlistentry>
1066  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1067  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1068  *   described in <link
1069  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1070  *   Appearance of Styles</link>.</para></listitem>
1071  * </varlistentry>
1072  * <varlistentry>
1073  *   <term>%stylehint_ReverseColor</term>
1074  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1075  *   colors are reversed.</para></listitem>
1076  * </varlistentry>
1077  * </variablelist>
1078  *
1079  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1080  */
1081 glui32
1082 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1083 {
1084 #ifdef DEBUG_STYLES
1085         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1086 #endif
1087
1088         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1089         GtkTextTag *tag;
1090
1091         switch(win->type) {
1092         case wintype_TextBuffer:
1093                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1094                 if(result)
1095                         *result = query_tag(tag, win->type, hint);
1096                 break;
1097         case wintype_TextGrid:
1098                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1099                 if(result)
1100                         *result = query_tag(tag, win->type, hint);
1101         default:
1102                 return FALSE;
1103         }
1104
1105         return TRUE;
1106 }
1107
1108 /* Internal function returning the current default font for a window type
1109  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1110  * supported for now */
1111 PangoFontDescription *
1112 get_current_font(guint32 wintype)
1113 {
1114         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1115         GtkTextTag *tag;
1116
1117         switch(wintype) {
1118         case wintype_TextGrid:
1119                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1120                 break;
1121         case wintype_TextBuffer:
1122                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1123                 break;
1124         default:
1125                 return NULL;
1126         }
1127
1128         PangoFontDescription *font;
1129         g_object_get( G_OBJECT(tag), "font-desc", &font, NULL );
1130
1131         return font;
1132 }
1133
1134 /* Internal function copying the attributes of a text tag to a pango attribute list */
1135 static void
1136 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1137 {
1138         gboolean set;
1139         GdkColor *foreground, *background;
1140         gchar *string;
1141         PangoFontDescription *font_desc;
1142         gboolean strikethrough;
1143         PangoUnderline underline;
1144
1145         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1146         if(set) {
1147                 pango_attr_list_insert(
1148                         list,
1149                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1150                 );
1151         }
1152         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1153         if(set) {
1154                 pango_attr_list_insert(
1155                         list,
1156                         pango_attr_background_new(background->red, background->green, background->blue)
1157                 );
1158         }
1159         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1160         if(set) {
1161                 pango_attr_list_insert(
1162                         list,
1163                         pango_attr_language_new( pango_language_from_string(string) )
1164                 );
1165         }
1166
1167         /* Font description updates the following properties simultaniously:
1168          * family, style, weight, variant, stretch, size
1169          */
1170         g_object_get(tag, "font-desc", &font_desc, NULL);
1171         pango_attr_list_insert(
1172                 list,
1173                 pango_attr_font_desc_new(font_desc)
1174         );
1175
1176         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1177         if(set) {
1178                 pango_attr_list_insert(
1179                         list,
1180                         pango_attr_strikethrough_new(strikethrough)
1181                 );
1182         }
1183         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1184         if(set) {
1185                 pango_attr_list_insert(
1186                         list,
1187                         pango_attr_underline_new(underline)
1188                 );
1189         }
1190 }
1191
1192 /* Update pager and reverse video tags */
1193 void
1194 style_update(ChimaraGlk *glk)
1195 {
1196         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1197
1198         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1199         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1200 }
1201
1202 /* Determine the current colors used to render the text for a given stream.
1203  * This can be set in a number of places */
1204 static void
1205 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1206 {
1207         gboolean foreground_set = FALSE;
1208         gboolean background_set = FALSE;
1209         gint reverse_color;
1210
1211         // Default color
1212         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1213         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1214         if(foreground_set)
1215                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1216         if(background_set)
1217                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1218
1219         // Player defined color
1220         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1221         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1222         if(foreground_set)
1223                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1224         if(background_set)
1225                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1226
1227         // GLK defined color
1228         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1229         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1230         if(foreground_set)
1231                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1232         if(background_set)
1233                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1234
1235 }
1236
1237 /* Determine the current colors used to render the text for a given stream.
1238  * This can be set in a number of places */
1239 void
1240 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1241 {
1242         VALID_STREAM(str, return);
1243         g_return_if_fail(str->window != NULL);
1244         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1245
1246         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1247         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1248         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1249         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1250         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1251
1252         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1253
1254         gboolean foreground_set, background_set;
1255
1256         // Windows can have zcolors defined
1257         if(str->window->zcolor) {
1258                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1259                 if(foreground_set)
1260                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1261                 if(background_set)
1262                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1263         }
1264 }