libchimara/style.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include "chimara-glk-private.h"
   4 #include "glk.h"
   5 #include "style.h"
   6 #include "magic.h"
   7 #include "stream.h"
   8 #include "strio.h"
   9
  10 extern GPrivate *glk_data_key;
  11
  12 static gboolean style_accept(GScanner *scanner, GTokenType token);
  13 static gboolean style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk);
  14 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  15 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  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
  20 /**
  21  * glk_set_style:
  22  * @styl: The style to apply
  23  *
  24  * Changes the style of the current output stream. @styl should be one of the
  25  * <code>style_</code> constants. However, any value is actually legal; if the
  26  * interpreter does not recognize the style value, it will treat it as
  27  * %style_Normal.
  28  * <note><para>
  29  *  This policy allows for the future definition of styles without breaking old
  30  *  Glk libraries.
  31  * </para></note>
  32  */
  33 void
  34 glk_set_style(glui32 styl)
  35 {
  36         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  37         g_return_if_fail(glk_data->current_stream != NULL);
  38         glk_set_style_stream(glk_data->current_stream, styl);
  39 }
  40
  41 /* The first 11 tag names must correspond to the first 11 glk tag names as defined below */
  42 static const gchar* TAG_NAMES[] = {
  43         "normal",
  44         "emphasized",
  45         "preformatted",
  46         "header",
  47         "subheader",
  48         "alert",
  49         "note",
  50         "block-quote",
  51         "input",
  52         "user1",
  53         "user2",
  54         "hyperlink",
  55         "pager",
  56         "default"
  57 };
  58
  59 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
  60 static const gchar* GLK_TAG_NAMES[] = {
  61         "glk-normal",
  62         "glk-emphasized",
  63         "glk-preformatted",
  64         "glk-header",
  65         "glk-subheader",
  66         "glk-alert",
  67         "glk-note",
  68         "glk-block-quote",
  69         "glk-input",
  70         "glk-user1",
  71         "glk-user2"
  72 };
  73
  74 const gchar**
  75 style_get_tag_names()
  76 {
  77         return TAG_NAMES;
  78 }
  79
  80 /* Internal function: mapping from style enum to tag name */
  81 static const gchar*
  82 get_tag_name(glui32 style)
  83 {
  84         if(style >= CHIMARA_NUM_STYLES) {
  85                 WARNING("Unsupported style");
  86                 return "normal";
  87         } else {
  88                 return (gchar*) TAG_NAMES[style];
  89         }
  90 }
  91
  92 /* Internal function: mapping from glk style enum to tag name */
  93 static const gchar*
  94 get_glk_tag_name(glui32 style)
  95 {
  96         if(style >= style_NUMSTYLES) {
  97                 WARNING("Unsupported style");
  98                 return "normal";
  99         } else {
 100                 return (gchar*) GLK_TAG_NAMES[style];
 101         }
 102 }
 103
 104 /**
 105  * glk_set_style_stream:
 106  * @str: Output stream to change the style of
 107  * @styl: The style to apply
 108  *
 109  * This changes the style of the stream @str. See glk_set_style().
 110  */
 111 void
 112 glk_set_style_stream(strid_t str, glui32 styl) {
 113         if(str->window == NULL)
 114                 return;
 115
 116         flush_window_buffer(str->window);
 117         str->style = (gchar*) get_tag_name(styl);
 118         str->glk_style = (gchar*) get_glk_tag_name(styl);
 119 }
 120
 121 /* Internal function: call this to initialize the layout of the 'more' prompt. */
 122 void
 123 style_init_more_prompt(winid_t win)
 124 {
 125         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 126
 127         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
 128         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
 129 }
 130
 131 /* Internal function: call this to initialize the default styles to a textbuffer. */
 132 void
 133 style_init_textbuffer(GtkTextBuffer *buffer)
 134 {
 135         g_return_if_fail(buffer != NULL);
 136
 137         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 138
 139         /* Place the default text tags in the textbuffer's tag table */
 140         g_hash_table_foreach(glk_data->styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 141
 142         /* Copy the override text tags to the textbuffers's tag table */
 143         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 144 }
 145
 146
 147 /* Internal function: call this to initialize the default styles to a textgrid. */
 148 void
 149 style_init_textgrid(GtkTextBuffer *buffer)
 150 {
 151         g_return_if_fail(buffer != NULL);
 152
 153         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 154
 155         /* Place the default text tags in the textbuffer's tag table */
 156         g_hash_table_foreach(glk_data->styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 157
 158         /* Copy the current text tags to the textbuffers's tag table */
 159         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 160 }
 161
 162 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 163 static void
 164 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 165 {
 166         g_return_if_fail(key != NULL);
 167         g_return_if_fail(tag != NULL);
 168         g_return_if_fail(tag_table != NULL);
 169
 170         gtk_text_tag_table_add(tag_table, tag);
 171 }
 172
 173 /* Internal function used to iterate over a style table, copying it */
 174 static void
 175 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 176 {
 177         g_return_if_fail(key != NULL);
 178         g_return_if_fail(tag != NULL);
 179         g_return_if_fail(target_table != NULL);
 180
 181         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 182 }
 183
 184 /* Internal function that copies a text tag */
 185 GtkTextTag *
 186 gtk_text_tag_copy(GtkTextTag *tag)
 187 {
 188         GtkTextTag *copy;
 189
 190         g_return_val_if_fail(tag != NULL, NULL);
 191
 192         copy = gtk_text_tag_new(tag->name);
 193         gtk_text_attributes_copy_values(tag->values, copy->values);
 194
 195         #define _COPY_FLAG(flag) copy->flag = tag->flag
 196                 _COPY_FLAG (bg_color_set);
 197                 _COPY_FLAG (bg_color_set);
 198                 _COPY_FLAG (bg_stipple_set);
 199                 _COPY_FLAG (fg_color_set);
 200                 _COPY_FLAG (fg_stipple_set);
 201                 _COPY_FLAG (justification_set);
 202                 _COPY_FLAG (left_margin_set);
 203                 _COPY_FLAG (indent_set);
 204                 _COPY_FLAG (rise_set);
 205                 _COPY_FLAG (strikethrough_set);
 206                 _COPY_FLAG (right_margin_set);
 207                 _COPY_FLAG (pixels_above_lines_set);
 208                 _COPY_FLAG (pixels_below_lines_set);
 209                 _COPY_FLAG (pixels_inside_wrap_set);
 210                 _COPY_FLAG (tabs_set);
 211                 _COPY_FLAG (underline_set);
 212                 _COPY_FLAG (wrap_mode_set);
 213                 _COPY_FLAG (bg_full_height_set);
 214                 _COPY_FLAG (invisible_set);
 215                 _COPY_FLAG (editable_set);
 216                 _COPY_FLAG (language_set);
 217         #undef _COPY_FLAG
 218
 219         /* Copy the data that was added manually */
 220         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse_color" );
 221
 222         if(reverse_color)
 223                 g_object_set_data( G_OBJECT(copy), "reverse_color", reverse_color );
 224
 225         return copy;
 226 }
 227
 228 /* Internal function that constructs the default styles */
 229 void
 230 style_init(ChimaraGlk *glk)
 231 {
 232         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 233
 234         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 235         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 236         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 237         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 238         GtkTextTag *tag;
 239
 240         PangoFontDescription *default_font_desc = pango_font_description_from_string("Serif");
 241         PangoFontDescription *monospace_font_desc = pango_font_description_from_string("Monospace");
 242
 243         /* Initialise the default styles for a text grid */
 244         tag = gtk_text_tag_new("default");
 245         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 246         g_hash_table_insert(default_text_grid_styles, "default", tag);
 247
 248         tag = gtk_text_tag_new("normal");
 249         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 250         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 251
 252         tag = gtk_text_tag_new("emphasized");
 253         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 254         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 255         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 256
 257         tag = gtk_text_tag_new("preformatted");
 258         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 259         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 260
 261         tag = gtk_text_tag_new("header");
 262         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 263         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 264         g_hash_table_insert(default_text_grid_styles, "header", tag);
 265
 266         tag = gtk_text_tag_new("subheader");
 267         //g_object_set(tag, "font-desc", monospace_font_desc, "weight", PANGO_WEIGHT_BOLD, NULL);
 268         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 269         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 270
 271         tag = gtk_text_tag_new("alert");
 272         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 273         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 274         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 275
 276         tag = gtk_text_tag_new("note");
 277         //g_object_set(tag, "font-desc", monospace_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 278         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 279         g_hash_table_insert(default_text_grid_styles, "note", tag);
 280
 281         tag = gtk_text_tag_new("block-quote");
 282         //g_object_set(tag, "font-desc", monospace_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 283         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 284         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 285
 286         tag = gtk_text_tag_new("input");
 287         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 288         g_hash_table_insert(default_text_grid_styles, "input", tag);
 289
 290         tag = gtk_text_tag_new("user1");
 291         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 292         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 293
 294         tag = gtk_text_tag_new("user2");
 295         //g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 296         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 297
 298         tag = gtk_text_tag_new("hyperlink");
 299         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 300         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 301
 302         /* Initialise the default styles for a text buffer */
 303         tag = gtk_text_tag_new("default");
 304         g_object_set(tag, "font-desc", default_font_desc, NULL);
 305         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 306
 307         tag = gtk_text_tag_new("normal");
 308         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 309         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 310
 311         tag = gtk_text_tag_new("emphasized");
 312         //g_object_set(tag, "font-desc", default_font_desc, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 313         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 314         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 315
 316         tag = gtk_text_tag_new("preformatted");
 317         g_object_set(tag, "font-desc", monospace_font_desc, NULL);
 318         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 319
 320         tag = gtk_text_tag_new("header");
 321         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 322         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 323         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 324
 325         tag = gtk_text_tag_new("subheader");
 326         //g_object_set(tag, "font-desc", default_font_desc, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 327         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 328         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 329
 330         tag = gtk_text_tag_new("alert");
 331         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 332         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 333         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 334
 335         tag = gtk_text_tag_new("note");
 336         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 337         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 338         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 339
 340         tag = gtk_text_tag_new("block-quote");
 341         //g_object_set(tag, "font-desc", default_font_desc, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 342         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 343         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 344
 345         tag = gtk_text_tag_new("input");
 346         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 347         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 348
 349         tag = gtk_text_tag_new("user1");
 350         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 351         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 352
 353         tag = gtk_text_tag_new("user2");
 354         //g_object_set(tag, "font-desc", default_font_desc, NULL);
 355         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 356
 357         tag = gtk_text_tag_new("hyperlink");
 358         //g_object_set(tag, "font-desc", default_font_desc, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 359         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 360         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 361
 362         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 363         g_object_set(pager_tag, "font-desc", default_font_desc, "foreground", "#ffffff", "background", "#000000", NULL);
 364         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 365         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 366
 367         pango_font_description_free(default_font_desc);
 368         pango_font_description_free(monospace_font_desc);
 369
 370         priv->styles->text_grid = default_text_grid_styles;
 371         priv->styles->text_buffer = default_text_buffer_styles;
 372
 373
 374         /* Initialize the GLK styles to empty tags */
 375         int i;
 376         for(i=0; i<style_NUMSTYLES; i++) {
 377                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 378                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 379                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 380                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 381         }
 382
 383         priv->glk_styles->text_grid = glk_text_grid_styles;
 384         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 385
 386 }
 387
 388 /* Reset style tables to the library's internal defaults */
 389 void
 390 reset_default_styles(ChimaraGlk *glk)
 391 {
 392         /* TODO: write this function */
 393 }
 394
 395 /* Copy the default styles to the current styles
 396  FIXME: This function is temporary and will not be needed later on */
 397 void
 398 copy_default_styles_to_current_styles(ChimaraGlk *glk)
 399 {
 400         /*
 401         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 402         g_hash_table_foreach(priv->styles->text_grid, style_table_copy, priv->glk_styles->text_grid);
 403         g_hash_table_foreach(priv->styles->text_buffer, style_table_copy, priv->glk_styles->text_buffer);
 404
 405         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 406         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 407         */
 408 }
 409
 410 /* Create the CSS file scanner */
 411 GScanner *
 412 create_css_file_scanner(void)
 413 {
 414         GScanner *scanner = g_scanner_new(NULL);
 415         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 416         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 417         scanner->config->symbol_2_token = TRUE;
 418         scanner->config->cpair_comment_single = NULL;
 419         scanner->config->scan_float = FALSE;
 420         return scanner;
 421 }
 422
 423 /* Run the scanner over the CSS file, overriding the default styles */
 424 void
 425 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 426 {
 427         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 428
 429         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 430                 if( !style_accept_style_selector(scanner, glk) )
 431                         break;
 432         }
 433
 434         g_scanner_destroy(scanner);
 435
 436         /* Update the pager prompt to the new style */
 437         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 438         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 439 }
 440
 441 /* Internal function: parses a token */
 442 static gboolean
 443 style_accept(GScanner *scanner, GTokenType token)
 444 {
 445         GTokenType next = g_scanner_get_next_token(scanner);
 446         if(next != token) {
 447                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 448                 return FALSE;
 449         }
 450         return TRUE;
 451 }
 452
 453 /* Internal function: parses a style selector */
 454 static gboolean
 455 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 456 {
 457         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 458
 459         GtkTextTag *current_tag;
 460         gchar *field;
 461         GTokenType token = g_scanner_get_next_token(scanner);
 462         GTokenValue value = g_scanner_cur_value(scanner);
 463
 464         if(
 465                 token != G_TOKEN_IDENTIFIER ||
 466                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 467         ) {
 468                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 469                 return FALSE;
 470         }
 471
 472         field = g_strdup(value.v_identifier);
 473
 474         /* Parse the tag name to change */
 475         if( g_scanner_peek_next_token(scanner) == '{') {
 476                 style_accept(scanner, '{');
 477                 if( !strcmp(field, "buffer") )
 478                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 479                 else
 480                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 481         } else {
 482                 if( !style_accept(scanner, '.') )
 483                         return FALSE;
 484
 485                 token = g_scanner_get_next_token(scanner);
 486                 value = g_scanner_cur_value(scanner);
 487
 488                 if(token != G_TOKEN_IDENTIFIER) {
 489                         g_scanner_error(scanner, "CSS Error: style selector expected");
 490                         return FALSE;
 491                 }
 492
 493                 if( !strcmp(field, "buffer") )
 494                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 495                 else
 496                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 497
 498                 if(current_tag == NULL) {
 499                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 500                         return FALSE;
 501                 }
 502
 503                 if( !style_accept(scanner, '{') )
 504                         return FALSE;
 505         }
 506
 507         while( g_scanner_peek_next_token(scanner) != '}') {
 508                 if( !style_accept_style_hint(scanner, current_tag) )
 509                         return FALSE;
 510         }
 511
 512         if( !style_accept(scanner, '}') )
 513                 return FALSE;
 514
 515         return TRUE;
 516 }
 517
 518 /* Internal function: parses a style hint */
 519 static gboolean
 520 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 521 {
 522         GTokenType token = g_scanner_get_next_token(scanner);
 523         GTokenValue value = g_scanner_cur_value(scanner);
 524         gchar *hint;
 525
 526         if(token != G_TOKEN_IDENTIFIER) {
 527                 g_scanner_error(scanner, "CSS Error: style hint expected");
 528                 return FALSE;
 529         }
 530
 531         hint = g_strdup(value.v_identifier);
 532
 533         if( !style_accept(scanner, ':') )
 534                 return FALSE;
 535
 536         token = g_scanner_get_next_token(scanner);
 537         value = g_scanner_cur_value(scanner);
 538
 539         if( !strcmp(hint, "font-family") ) {
 540                 if(token != G_TOKEN_STRING) {
 541                         g_scanner_error(scanner, "CSS Error: string expected");
 542                         return FALSE;
 543                 }
 544                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 545         }
 546         else if( !strcmp(hint, "font-weight") ) {
 547                 if(token != G_TOKEN_IDENTIFIER) {
 548                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 549                         return FALSE;
 550                 }
 551
 552                 if( !strcmp(value.v_identifier, "bold") )
 553                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 554                 else if( !strcmp(value.v_identifier, "normal") )
 555                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 556                 else {
 557                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 558                         return FALSE;
 559                 }
 560         }
 561         else if( !strcmp(hint, "font-style") ) {
 562                 if(token != G_TOKEN_IDENTIFIER) {
 563                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 564                         return FALSE;
 565                 }
 566
 567                 if( !strcmp(value.v_identifier, "italic") )
 568                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 569                 else if( !strcmp(value.v_identifier, "normal") )
 570                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 571                 else {
 572                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 573                         return FALSE;
 574                 }
 575         }
 576         else if( !strcmp(hint, "font-size") ) {
 577                 if(token == G_TOKEN_INT)
 578                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 579                 else if(token == G_TOKEN_FLOAT)
 580                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 581                 else {
 582                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 583                         return FALSE;
 584                 }
 585         }
 586         else if( !strcmp(hint, "color") ) {
 587                 if(token != G_TOKEN_IDENTIFIER) {
 588                         g_scanner_error(scanner, "CSS Error: hex color expected");
 589                         return FALSE;
 590                 }
 591
 592                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 593         }
 594         else if( !strcmp(hint, "background-color") ) {
 595                 if(token != G_TOKEN_IDENTIFIER) {
 596                         g_scanner_error(scanner, "CSS Error: hex color expected");
 597                         return FALSE;
 598                 }
 599                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 600         }
 601         else if( !strcmp(hint, "text-align") ) {
 602                 if(token != G_TOKEN_IDENTIFIER) {
 603                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 604                         return FALSE;
 605                 }
 606
 607                 if( !strcmp(value.v_identifier, "left") )
 608                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 609                 else if( !strcmp(value.v_identifier, "right") )
 610                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 611                 else if( !strcmp(value.v_identifier, "center") )
 612                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 613                 else {
 614                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 615                         return FALSE;
 616                 }
 617         }
 618         else if( !strcmp(hint, "margin-left") ) {
 619                 if(token != G_TOKEN_INT) {
 620                         g_scanner_error(scanner, "CSS Error: integer expected");
 621                         return FALSE;
 622                 }
 623                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 624         }
 625         else if( !strcmp(hint, "margin-right") ) {
 626                 if(token != G_TOKEN_INT) {
 627                         g_scanner_error(scanner, "CSS Error: integer expected");
 628                         return FALSE;
 629                 }
 630                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 631         }
 632         else if( !strcmp(hint, "margin-top") ) {
 633                 if(token != G_TOKEN_INT) {
 634                         g_scanner_error(scanner, "CSS Error: integer expected");
 635                         return FALSE;
 636                 }
 637                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 638         }
 639         else if( !strcmp(hint, "margin-bottom") ) {
 640                 if(token != G_TOKEN_INT) {
 641                         g_scanner_error(scanner, "CSS Error: integer expected");
 642                         return FALSE;
 643                 }
 644                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 645         }
 646
 647         else {
 648                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 649                 return FALSE;
 650         }
 651
 652         if( !style_accept(scanner, ';') )
 653                 return FALSE;
 654
 655         return TRUE;
 656 }
 657
 658 /* Internal function: parses a glk color to a #hex-value */
 659 static void
 660 glkcolor_to_hex(glui32 val, gchar *buffer)
 661 {
 662         g_return_if_fail(buffer != NULL);
 663
 664         sprintf(buffer, "#%02X%02X%02X",
 665                 ((val & 0xff0000) >> 16),
 666                 ((val & 0x00ff00) >> 8),
 667                 (val & 0x0000ff)
 668         );
 669 }
 670
 671 /* Internal function: parses a glk color to a GdkColor */
 672 void
 673 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 674 {
 675         color->red = 256 * ((val & 0xff0000) >> 16);
 676         color->green = 256 * ((val & 0x00ff00) >> 8);
 677         color->blue = 256 * (val & 0x0000ff);
 678 }
 679
 680 /* Internal function: parses a GdkColor to a glk color */
 681 static glui32
 682 gdkcolor_to_glkcolor(GdkColor *color)
 683 {
 684         g_return_val_if_fail(color != NULL, 0);
 685         return (glui32) color->pixel;
 686 }
 687
 688 /* Internal function: changes a GTK tag to correspond with the given style. */
 689 static void
 690 apply_stylehint_to_tag(GtkTextTag *tag, GtkTextTag *default_tag, glui32 wintype, glui32 hint, glsi32 val)
 691 {
 692         g_return_if_fail(tag != NULL);
 693
 694         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 695         GObject *tag_object = G_OBJECT(tag);
 696
 697         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 698
 699         int i = 0;
 700         gchar color[20];
 701         switch(hint) {
 702         case stylehint_Indentation:
 703                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 704                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 705                 break;
 706
 707         case stylehint_ParaIndentation:
 708                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 709                 break;
 710
 711         case stylehint_Justification:
 712                 switch(val) {
 713                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 714                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 715                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 716                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 717                         default:
 718                                 WARNING("Unknown justification");
 719                                 i = GTK_JUSTIFY_LEFT;
 720                 }
 721                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 722                 break;
 723
 724         case stylehint_Weight:
 725                 switch(val) {
 726                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 727                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 728                         case  1: i = PANGO_WEIGHT_BOLD; break;
 729                         default: WARNING("Unknown font weight");
 730                 }
 731                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 732                 break;
 733
 734         case stylehint_Size:
 735                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 736                 break;
 737
 738         case stylehint_Oblique:
 739                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 740                 break;
 741
 742         case stylehint_Proportional:
 743         {
 744                 gchar *font_family;
 745                 GtkTextTag *font_tag = g_hash_table_lookup(
 746                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 747                     val? "normal" : "preformatted");
 748                 g_object_get(font_tag, "family", &font_family, NULL);
 749                 g_object_set(tag_object, "family", font_family, "family-set", TRUE, NULL);
 750                 g_free(font_family);
 751         }
 752                 break;
 753
 754         case stylehint_TextColor:
 755                 glkcolor_to_hex(val, color);
 756
 757                 if(!reverse_color)
 758                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 759                 else
 760                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 761
 762                 break;
 763
 764         case stylehint_BackColor:
 765                 glkcolor_to_hex(val, color);
 766
 767                 if(!reverse_color)
 768                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 769                 else
 770                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 771
 772                 break;
 773
 774         case stylehint_ReverseColor:
 775                 if(reverse_color != val) {
 776                         /* Flip the fore- and background colors */
 777                         GdkColor* foreground_color;
 778                         GdkColor* background_color;
 779                         gint f_set, b_set, df_set, db_set = 0;
 780                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 781                         g_object_get(default_tag, "foreground-set", &df_set, "background-set", &db_set, NULL);
 782
 783                         if(f_set)
 784                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 785                         else if(df_set)
 786                                 g_object_get(default_tag, "foreground-gdk", &foreground_color, NULL);
 787                         if(b_set)
 788                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 789                         else if(db_set)
 790                                 g_object_get(default_tag, "background-gdk", &background_color, NULL);
 791
 792                         if(b_set || db_set)
 793                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 794                         else
 795                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 796
 797                         if(f_set || df_set)
 798                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 799                         else
 800                                 g_object_set(tag_object, "background", "#000000", NULL);
 801
 802                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 803                 }
 804                 break;
 805
 806         default:
 807                 WARNING("Unknown style hint");
 808         }
 809 }
 810
 811 /* Internal function: queries a text tag for the value of a given style hint */
 812 static gint
 813 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 814 {
 815         gint intval;
 816         GdkColor *colval;
 817
 818         g_return_val_if_fail(tag != NULL, 0);
 819
 820         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 821
 822         switch(hint) {
 823         case stylehint_Indentation:
 824                 g_object_get(tag, "left_margin", &intval, NULL);
 825                 return intval/5;
 826
 827         case stylehint_ParaIndentation:
 828                 g_object_get(tag, "indent", &intval, NULL);
 829                 return intval/5;
 830
 831         case stylehint_Justification:
 832                 g_object_get(tag, "justification", &intval, NULL);
 833                 switch(intval) {
 834                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 835                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 836                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 837                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 838                         default:
 839                                 WARNING("Unknown justification");
 840                                 return stylehint_just_LeftFlush;
 841                 }
 842
 843         case stylehint_Weight:
 844                 g_object_get(tag, "weight", &intval, NULL);
 845                 switch(intval) {
 846                         case PANGO_WEIGHT_LIGHT: return -1;
 847                         case PANGO_WEIGHT_NORMAL: return 0;
 848                         case PANGO_WEIGHT_BOLD: return 1;
 849                         default: WARNING("Unknown font weight"); return 0;
 850                 }
 851
 852         case stylehint_Size:
 853                 g_object_get(tag, "size", &intval, NULL);
 854                 return (intval/2)-14;
 855
 856         case stylehint_Oblique:
 857                 g_object_get(tag, "style", &intval , NULL);
 858                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 859
 860         case stylehint_Proportional:
 861                 /* Use pango_font_family_is_monospace()? */
 862         {
 863                 gchar *font_family, *query_font_family;
 864                 GtkTextTag *font_tag = g_hash_table_lookup(
 865                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 866                     "preformatted");
 867                 g_object_get(font_tag, "family", &font_family, NULL);
 868                 g_object_get(tag, "family", &query_font_family, NULL);
 869                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 870                 g_free(font_family);
 871                 g_free(query_font_family);
 872                 return retval;
 873         }
 874
 875         case stylehint_TextColor:
 876                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 877                 return gdkcolor_to_glkcolor(colval);
 878
 879         case stylehint_BackColor:
 880                 g_object_get(tag, "background-gdk", &colval, NULL);
 881                 return gdkcolor_to_glkcolor(colval);
 882
 883         case stylehint_ReverseColor:
 884                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 885
 886         default:
 887                 WARNING("Unknown style hint");
 888         }
 889
 890         return 0;
 891 }
 892
 893 /**
 894  * glk_stylehint_set:
 895  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 896  * @styl: The style to set a hint for.
 897  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 898  * @val: The style hint. The meaning of this depends on @hint.
 899  *
 900  * Sets a hint about the appearance of one style for a particular type of
 901  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 902  * all types of window.
 903  * <note><para>
 904  *  There is no equivalent constant to set a hint for all styles of a single
 905  *  window type.
 906  * </para></note>
 907  */
 908 void
 909 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 910 {
 911         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 912
 913         GtkTextTag *to_change, *default_tag;
 914         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 915                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 916                 default_tag = g_hash_table_lookup( glk_data->styles->text_buffer, get_tag_name(styl) );
 917                 apply_stylehint_to_tag(to_change, default_tag, wintype_TextBuffer, hint, val);
 918         }
 919
 920         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 921                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 922                 default_tag = g_hash_table_lookup( glk_data->styles->text_grid, get_tag_name(styl) );
 923                 apply_stylehint_to_tag(to_change, default_tag, wintype_TextGrid, hint, val);
 924         }
 925 }
 926
 927 /**
 928  * glk_stylehint_clear:
 929  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 930  * @styl: The style to set a hint for.
 931  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 932  *
 933  * Clears a hint about the appearance of one style for a particular type of
 934  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 935  * which clears a hint for all types of window.
 936  * <note><para>
 937  *  There is no equivalent constant to reset a hint for all styles of a single
 938  *  window type.
 939  * </para></note>
 940  */
 941 void
 942 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 943 {
 944         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 945         GtkTextTag *tag;
 946
 947         switch(wintype) {
 948         case wintype_TextBuffer:
 949                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 950                 if(tag) {
 951                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 952                 }
 953                 break;
 954         case wintype_TextGrid:
 955                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 956                 if(tag) {
 957                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 958                 }
 959         default:
 960                 return;
 961         }
 962 }
 963
 964 /**
 965  * glk_style_distinguish:
 966  * @win: The window in which the styles are to be distinguished.
 967  * @styl1: The first style to be distinguished from the second style.
 968  * @styl2: The second style to be distinguished from the first style.
 969  *
 970  * Decides whether two styles are visually distinguishable in the given window.
 971  * The exact meaning of this is left for the library to determine.
 972  * <note><title>Chimara</title><para>
 973  *   Currently, all styles of one window are assumed to be mutually
 974  *   distinguishable.
 975  * </para></note>
 976  *
 977  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 978  * are not, it returns %FALSE (0).
 979  */
 980 glui32
 981 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 982 {
 983         /* FIXME */
 984         return styl1 != styl2;
 985 }
 986
 987 /**
 988  * glk_style_measure:
 989  * @win: The window from which to take the style.
 990  * @styl: The style to perform the measurement on.
 991  * @hint: The stylehint to measure.
 992  * @result: Address to write the result to.
 993  *
 994  * Tries to test an attribute of one style in the given window @win. The library
 995  * may not be able to determine the attribute; if not, this returns %FALSE (0).
 996  * If it can, it returns %TRUE (1) and stores the value in the location pointed
 997  * at by @result.
 998  * <note><para>
 999  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1000  * </para></note>
1001  *
1002  * The meaning of the value depends on the hint which was tested:
1003  * <variablelist>
1004  * <varlistentry>
1005  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1006  *   <listitem><para>The indentation and paragraph indentation. These are in a
1007  *   metric which is platform-dependent.</para>
1008  *   <note><para>Most likely either characters or pixels.</para></note>
1009  *   </listitem>
1010  * </varlistentry>
1011  * <varlistentry>
1012  *   <term>%stylehint_Justification</term>
1013  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1014  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1015  *   %stylehint_just_RightFlush.</para></listitem>
1016  * </varlistentry>
1017  * <varlistentry>
1018  *   <term>%stylehint_Size</term>
1019  *   <listitem><para>The font size. Again, this is in a platform-dependent
1020  *   metric.</para>
1021  *   <note><para>Pixels, points, or simply 1 if the library does not support
1022  *   varying font sizes.</para></note>
1023  *   </listitem>
1024  * </varlistentry>
1025  * <varlistentry>
1026  *   <term>%stylehint_Weight</term>
1027  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1028  *   and -1 for light-weight fonts.</para></listitem>
1029  * </varlistentry>
1030  * <varlistentry>
1031  *   <term>%stylehint_Oblique</term>
1032  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1033  *   </listitem>
1034  * </varlistentry>
1035  * <varlistentry>
1036  *   <term>%stylehint_Proportional</term>
1037  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1038  *   </para></listitem>
1039  * </varlistentry>
1040  * <varlistentry>
1041  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1042  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1043  *   described in <link
1044  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1045  *   Appearance of Styles</link>.</para></listitem>
1046  * </varlistentry>
1047  * <varlistentry>
1048  *   <term>%stylehint_ReverseColor</term>
1049  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1050  *   colors are reversed.</para></listitem>
1051  * </varlistentry>
1052  * </variablelist>
1053  *
1054  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1055  */
1056 glui32
1057 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1058 {
1059         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1060         GtkTextTag *tag;
1061
1062         switch(win->type) {
1063         case wintype_TextBuffer:
1064                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1065                 if(result)
1066                         *result = query_tag(tag, win->type, hint);
1067                 break;
1068         case wintype_TextGrid:
1069                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1070                 if(result)
1071                         *result = query_tag(tag, win->type, hint);
1072         default:
1073                 return FALSE;
1074         }
1075
1076         return TRUE;
1077 }
1078
1079 /* Internal function returning the current default font for a window type
1080  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1081  * supported for now */
1082 PangoFontDescription *
1083 get_current_font(guint32 wintype)
1084 {
1085         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1086         GtkTextTag *tag;
1087
1088         switch(wintype) {
1089         case wintype_TextGrid:
1090                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1091                 break;
1092         case wintype_TextBuffer:
1093                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1094                 break;
1095         default:
1096                 return NULL;
1097         }
1098
1099         PangoFontDescription *font;
1100         g_object_get( G_OBJECT(tag), "font-desc", &font, NULL );
1101
1102         return font;
1103 }
1104
1105 /* Internal function copying the attributes of a text tag to a pango attribute list */
1106 static void
1107 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1108 {
1109         gboolean set;
1110         GdkColor *foreground, *background;
1111         gchar *string;
1112         PangoFontDescription *font_desc;
1113         gboolean strikethrough;
1114         PangoUnderline underline;
1115
1116         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1117         if(set) {
1118                 pango_attr_list_insert(
1119                         list,
1120                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1121                 );
1122         }
1123         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1124         if(set) {
1125                 pango_attr_list_insert(
1126                         list,
1127                         pango_attr_background_new(background->red, background->green, background->blue)
1128                 );
1129         }
1130         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1131         if(set) {
1132                 pango_attr_list_insert(
1133                         list,
1134                         pango_attr_language_new( pango_language_from_string(string) )
1135                 );
1136         }
1137
1138         /* Font description updates the following properties simultaniously:
1139          * family, style, weight, variant, stretch, size
1140          */
1141         g_object_get(tag, "font-desc", &font_desc, NULL);
1142         pango_attr_list_insert(
1143                 list,
1144                 pango_attr_font_desc_new(font_desc)
1145         );
1146
1147         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1148         if(set) {
1149                 pango_attr_list_insert(
1150                         list,
1151                         pango_attr_strikethrough_new(strikethrough)
1152                 );
1153         }
1154         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1155         if(set) {
1156                 pango_attr_list_insert(
1157                         list,
1158                         pango_attr_underline_new(underline)
1159                 );
1160         }
1161 }
1162
1163 /* Update pager and reverse video tags */
1164 void
1165 style_update(ChimaraGlk *glk)
1166 {
1167         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1168
1169         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1170         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1171 }