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