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
 293 /* Reset style tables to the library's internal defaults */
 294 void
 295 reset_default_styles(ChimaraGlk *glk)
 296 {
 297         /* TODO: write this function */
 298 }
 299
 300 /* Copy the default styles to the current styles
 301  FIXME: This function is temporary and will not be needed later on */
 302 void
 303 copy_default_styles_to_current_styles(ChimaraGlk *glk)
 304 {
 305         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 306         g_hash_table_foreach(priv->default_styles->text_grid, style_table_copy, priv->current_styles->text_grid);
 307         g_hash_table_foreach(priv->default_styles->text_buffer, style_table_copy, priv->current_styles->text_buffer);
 308
 309         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->default_styles->text_buffer, "pager") );
 310         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 311 }
 312
 313 /* Create the CSS file scanner */
 314 GScanner *
 315 create_css_file_scanner(void)
 316 {
 317         GScanner *scanner = g_scanner_new(NULL);
 318         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 319         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 320         scanner->config->symbol_2_token = TRUE;
 321         scanner->config->cpair_comment_single = NULL;
 322         scanner->config->scan_float = FALSE;
 323         return scanner;
 324 }
 325
 326 /* Run the scanner over the CSS file, overriding the default styles */
 327 void
 328 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 329 {
 330         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 331                 if( !style_accept_style_selector(scanner, glk) )
 332                         break;
 333         }
 334
 335         g_scanner_destroy(scanner);
 336 }
 337
 338 /* Internal function: parses a token */
 339 static gboolean
 340 style_accept(GScanner *scanner, GTokenType token)
 341 {
 342         GTokenType next = g_scanner_get_next_token(scanner);
 343         if(next != token) {
 344                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 345                 return FALSE;
 346         }
 347         return TRUE;
 348 }
 349
 350 /* Internal function: parses a style selector */
 351 static gboolean
 352 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 353 {
 354         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 355
 356         GtkTextTag *current_tag;
 357         gchar *field;
 358         GTokenType token = g_scanner_get_next_token(scanner);
 359         GTokenValue value = g_scanner_cur_value(scanner);
 360
 361         if(
 362                 token != G_TOKEN_IDENTIFIER ||
 363                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 364         ) {
 365                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 366                 return FALSE;
 367         }
 368
 369         field = g_strdup(value.v_identifier);
 370
 371         if( !style_accept(scanner, '.') )
 372                 return FALSE;
 373
 374         token = g_scanner_get_next_token(scanner);
 375         value = g_scanner_cur_value(scanner);
 376
 377         if(token != G_TOKEN_IDENTIFIER) {
 378                 g_scanner_error(scanner, "CSS Error: style selector expected");
 379                 return FALSE;
 380         }
 381
 382         if( !strcmp(field, "buffer") )
 383                 current_tag = g_hash_table_lookup(priv->default_styles->text_buffer, value.v_identifier);
 384         else
 385                 current_tag = g_hash_table_lookup(priv->default_styles->text_grid, value.v_identifier);
 386
 387         if(current_tag == NULL) {
 388                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 389                 return FALSE;
 390         }
 391
 392         if( !style_accept(scanner, '{') )
 393                 return FALSE;
 394
 395         while( g_scanner_peek_next_token(scanner) != '}') {
 396                 if( !style_accept_style_hint(scanner, current_tag) )
 397                         return FALSE;
 398         }
 399
 400         if( !style_accept(scanner, '}') )
 401                 return FALSE;
 402
 403         return TRUE;
 404 }
 405
 406 /* Internal function: parses a style hint */
 407 static gboolean
 408 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 409 {
 410         GTokenType token = g_scanner_get_next_token(scanner);
 411         GTokenValue value = g_scanner_cur_value(scanner);
 412         gchar *hint;
 413
 414         if(token != G_TOKEN_IDENTIFIER) {
 415                 g_scanner_error(scanner, "CSS Error: style hint expected");
 416                 return FALSE;
 417         }
 418
 419         hint = g_strdup(value.v_identifier);
 420
 421         if( !style_accept(scanner, ':') )
 422                 return FALSE;
 423
 424         token = g_scanner_get_next_token(scanner);
 425         value = g_scanner_cur_value(scanner);
 426
 427         if( !strcmp(hint, "font-family") ) {
 428                 if(token != G_TOKEN_STRING) {
 429                         g_scanner_error(scanner, "CSS Error: string expected");
 430                         return FALSE;
 431                 }
 432                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 433         }
 434         else if( !strcmp(hint, "font-weight") ) {
 435                 if(token != G_TOKEN_IDENTIFIER) {
 436                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 437                         return FALSE;
 438                 }
 439
 440                 if( !strcmp(value.v_identifier, "bold") )
 441                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 442                 else if( !strcmp(value.v_identifier, "normal") )
 443                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 444                 else {
 445                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 446                         return FALSE;
 447                 }
 448         }
 449         else if( !strcmp(hint, "font-style") ) {
 450                 if(token != G_TOKEN_IDENTIFIER) {
 451                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 452                         return FALSE;
 453                 }
 454
 455                 if( !strcmp(value.v_identifier, "italic") )
 456                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 457                 else if( !strcmp(value.v_identifier, "normal") )
 458                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 459                 else {
 460                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 461                         return FALSE;
 462                 }
 463         }
 464         else if( !strcmp(hint, "font-size") ) {
 465                 if(token == G_TOKEN_INT)
 466                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 467                 else if(token == G_TOKEN_FLOAT)
 468                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 469                 else {
 470                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 471                         return FALSE;
 472                 }
 473         }
 474         else if( !strcmp(hint, "color") ) {
 475                 if(token != G_TOKEN_IDENTIFIER) {
 476                         g_scanner_error(scanner, "CSS Error: hex color expected");
 477                         return FALSE;
 478                 }
 479
 480                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 481         }
 482         else if( !strcmp(hint, "background-color") ) {
 483                 if(token != G_TOKEN_IDENTIFIER) {
 484                         g_scanner_error(scanner, "CSS Error: hex color expected");
 485                         return FALSE;
 486                 }
 487                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 488         }
 489         else if( !strcmp(hint, "text-align") ) {
 490                 if(token != G_TOKEN_IDENTIFIER) {
 491                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 492                         return FALSE;
 493                 }
 494
 495                 if( !strcmp(value.v_identifier, "left") )
 496                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 497                 else if( !strcmp(value.v_identifier, "right") )
 498                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 499                 else if( !strcmp(value.v_identifier, "center") )
 500                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 501                 else {
 502                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 503                         return FALSE;
 504                 }
 505         }
 506         else if( !strcmp(hint, "margin-left") ) {
 507                 if(token != G_TOKEN_INT) {
 508                         g_scanner_error(scanner, "CSS Error: integer expected");
 509                         return FALSE;
 510                 }
 511                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 512         }
 513         else if( !strcmp(hint, "margin-right") ) {
 514                 if(token != G_TOKEN_INT) {
 515                         g_scanner_error(scanner, "CSS Error: integer expected");
 516                         return FALSE;
 517                 }
 518                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 519         }
 520         else if( !strcmp(hint, "margin-top") ) {
 521                 if(token != G_TOKEN_INT) {
 522                         g_scanner_error(scanner, "CSS Error: integer expected");
 523                         return FALSE;
 524                 }
 525                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 526         }
 527         else if( !strcmp(hint, "margin-bottom") ) {
 528                 if(token != G_TOKEN_INT) {
 529                         g_scanner_error(scanner, "CSS Error: integer expected");
 530                         return FALSE;
 531                 }
 532                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 533         }
 534
 535         else {
 536                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 537                 return FALSE;
 538         }
 539
 540         if( !style_accept(scanner, ';') )
 541                 return FALSE;
 542
 543         return TRUE;
 544 }
 545
 546 /* Internal function: parses a glk color to a #hex-value */
 547 static void
 548 glkcolor_to_hex(glui32 val, gchar *buffer)
 549 {
 550         g_return_if_fail(buffer != NULL);
 551
 552         sprintf(buffer, "#%02X%02X%02X",
 553                 ((val & 0xff0000) >> 16),
 554                 ((val & 0x00ff00) >> 8),
 555                 (val & 0x0000ff)
 556         );
 557 }
 558
 559 /* Internal function: parses a glk color to a GdkColor */
 560 void
 561 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 562 {
 563         color->red = 256 * ((val & 0xff0000) >> 16);
 564         color->green = 256 * ((val & 0x00ff00) >> 8);
 565         color->blue = 256 * (val & 0x0000ff);
 566 }
 567
 568 /* Internal function: parses a GdkColor to a glk color */
 569 static glui32
 570 gdkcolor_to_glkcolor(GdkColor *color)
 571 {
 572         g_return_val_if_fail(color != NULL, 0);
 573         return (glui32) color->pixel;
 574 }
 575
 576 /* Internal function: changes a GTK tag to correspond with the given style. */
 577 static void
 578 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 hint, glsi32 val)
 579 {
 580         g_return_if_fail(tag != NULL);
 581
 582         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 583         GObject *tag_object = G_OBJECT(tag);
 584
 585         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 586
 587         int i = 0;
 588         gchar color[20];
 589         switch(hint) {
 590         case stylehint_Indentation:
 591                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 592                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 593                 break;
 594
 595         case stylehint_ParaIndentation:
 596                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 597                 break;
 598
 599         case stylehint_Justification:
 600                 switch(val) {
 601                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 602                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 603                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 604                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 605                         default:
 606                                 WARNING("Unknown justification");
 607                                 i = GTK_JUSTIFY_LEFT;
 608                 }
 609                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 610                 break;
 611
 612         case stylehint_Weight:
 613                 switch(val) {
 614                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 615                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 616                         case  1: i = PANGO_WEIGHT_BOLD; break;
 617                         default: WARNING("Unknown font weight");
 618                 }
 619                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 620                 break;
 621
 622         case stylehint_Size:
 623                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 624                 break;
 625
 626         case stylehint_Oblique:
 627                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 628                 break;
 629
 630         case stylehint_Proportional:
 631         {
 632                 gchar *font_family;
 633                 GtkTextTag *font_tag = g_hash_table_lookup(
 634                     wintype == wintype_TextBuffer? glk_data->default_styles->text_buffer : glk_data->default_styles->text_grid,
 635                     val? "normal" : "preformatted");
 636                 g_object_get(font_tag, "family", &font_family, NULL);
 637                 g_object_set(tag_object, "family", font_family, "family-set", TRUE, NULL);
 638                 g_free(font_family);
 639         }
 640                 break;
 641
 642         case stylehint_TextColor:
 643                 glkcolor_to_hex(val, color);
 644
 645                 if(!reverse_color)
 646                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 647                 else
 648                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 649
 650                 break;
 651
 652         case stylehint_BackColor:
 653                 glkcolor_to_hex(val, color);
 654
 655                 if(!reverse_color)
 656                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 657                 else
 658                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 659
 660                 break;
 661
 662         case stylehint_ReverseColor:
 663                 if(reverse_color != val) {
 664                         /* Flip the fore- and background colors */
 665                         GdkColor* foreground_color;
 666                         GdkColor* background_color;
 667                         gint f_set, b_set = 0;
 668                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 669
 670                         if(f_set)
 671                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 672                         if(b_set)
 673                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 674
 675                         if(b_set)
 676                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 677                         else
 678                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 679
 680                         if(f_set)
 681                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 682                         else
 683                                 g_object_set(tag_object, "background", "#000000", NULL);
 684
 685                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 686                 }
 687                 break;
 688
 689         default:
 690                 WARNING("Unknown style hint");
 691         }
 692 }
 693
 694 /* Internal function: queries a text tag for the value of a given style hint */
 695 static gint
 696 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 697 {
 698         gint intval;
 699         GdkColor *colval;
 700
 701         g_return_val_if_fail(tag != NULL, 0);
 702
 703         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 704
 705         switch(hint) {
 706         case stylehint_Indentation:
 707                 g_object_get(tag, "left_margin", &intval, NULL);
 708                 return intval/5;
 709
 710         case stylehint_ParaIndentation:
 711                 g_object_get(tag, "indent", &intval, NULL);
 712                 return intval/5;
 713
 714         case stylehint_Justification:
 715                 g_object_get(tag, "justification", &intval, NULL);
 716                 switch(intval) {
 717                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 718                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 719                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 720                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 721                         default:
 722                                 WARNING("Unknown justification");
 723                                 return stylehint_just_LeftFlush;
 724                 }
 725
 726         case stylehint_Weight:
 727                 g_object_get(tag, "weight", &intval, NULL);
 728                 switch(intval) {
 729                         case PANGO_WEIGHT_LIGHT: return -1;
 730                         case PANGO_WEIGHT_NORMAL: return 0;
 731                         case PANGO_WEIGHT_BOLD: return 1;
 732                         default: WARNING("Unknown font weight"); return 0;
 733                 }
 734
 735         case stylehint_Size:
 736                 g_object_get(tag, "size", &intval, NULL);
 737                 return (intval/2)-14;
 738
 739         case stylehint_Oblique:
 740                 g_object_get(tag, "style", &intval , NULL);
 741                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 742
 743         case stylehint_Proportional:
 744                 /* Use pango_font_family_is_monospace()? */
 745         {
 746                 gchar *font_family, *query_font_family;
 747                 GtkTextTag *font_tag = g_hash_table_lookup(
 748                     wintype == wintype_TextBuffer? glk_data->default_styles->text_buffer : glk_data->default_styles->text_grid,
 749                     "preformatted");
 750                 g_object_get(font_tag, "family", &font_family, NULL);
 751                 g_object_get(tag, "family", &query_font_family, NULL);
 752                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 753                 g_free(font_family);
 754                 g_free(query_font_family);
 755                 return retval;
 756         }
 757
 758         case stylehint_TextColor:
 759                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 760                 return gdkcolor_to_glkcolor(colval);
 761
 762         case stylehint_BackColor:
 763                 g_object_get(tag, "background-gdk", &colval, NULL);
 764                 return gdkcolor_to_glkcolor(colval);
 765
 766         case stylehint_ReverseColor:
 767                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 768
 769         default:
 770                 WARNING("Unknown style hint");
 771         }
 772
 773         return 0;
 774 }
 775
 776 /**
 777  * glk_stylehint_set:
 778  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 779  * @styl: The style to set a hint for.
 780  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 781  * @val: The style hint. The meaning of this depends on @hint.
 782  *
 783  * Sets a hint about the appearance of one style for a particular type of
 784  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 785  * all types of window.
 786  * <note><para>
 787  *  There is no equivalent constant to set a hint for all styles of a single
 788  *  window type.
 789  * </para></note>
 790  */
 791 void
 792 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 793 {
 794         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 795
 796         GtkTextTag *to_change;
 797         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 798                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 799                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, hint, val);
 800         }
 801
 802         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 803                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 804                 apply_stylehint_to_tag(to_change, wintype_TextGrid, hint, val);
 805         }
 806 }
 807
 808 /**
 809  * glk_stylehint_clear:
 810  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 811  * @styl: The style to set a hint for.
 812  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 813  *
 814  * Clears a hint about the appearance of one style for a particular type of
 815  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 816  * which clears a hint for all types of window.
 817  * <note><para>
 818  *  There is no equivalent constant to reset a hint for all styles of a single
 819  *  window type.
 820  * </para></note>
 821  */
 822 void
 823 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 824 {
 825         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 826         GtkTextTag *tag;
 827
 828         switch(wintype) {
 829         case wintype_TextBuffer:
 830                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 831                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 832                 break;
 833         case wintype_TextGrid:
 834                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 835                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 836         default:
 837                 return;
 838         }
 839 }
 840
 841 /**
 842  * glk_style_distinguish:
 843  * @win: The window in which the styles are to be distinguished.
 844  * @styl1: The first style to be distinguished from the second style.
 845  * @styl2: The second style to be distinguished from the first style.
 846  *
 847  * Decides whether two styles are visually distinguishable in the given window.
 848  * The exact meaning of this is left for the library to determine.
 849  * <note><title>Chimara</title><para>
 850  *   Currently, all styles of one window are assumed to be mutually
 851  *   distinguishable.
 852  * </para></note>
 853  *
 854  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 855  * are not, it returns %FALSE (0).
 856  */
 857 glui32
 858 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 859 {
 860         /* FIXME */
 861         return styl1 != styl2;
 862 }
 863
 864 /**
 865  * glk_style_measure:
 866  * @win: The window from which to take the style.
 867  * @styl: The style to perform the measurement on.
 868  * @hint: The stylehint to measure.
 869  * @result: Address to write the result to.
 870  *
 871  * Tries to test an attribute of one style in the given window @win. The library
 872  * may not be able to determine the attribute; if not, this returns %FALSE (0).
 873  * If it can, it returns %TRUE (1) and stores the value in the location pointed
 874  * at by @result.
 875  * <note><para>
 876  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
 877  * </para></note>
 878  *
 879  * The meaning of the value depends on the hint which was tested:
 880  * <variablelist>
 881  * <varlistentry>
 882  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
 883  *   <listitem><para>The indentation and paragraph indentation. These are in a
 884  *   metric which is platform-dependent.</para>
 885  *   <note><para>Most likely either characters or pixels.</para></note>
 886  *   </listitem>
 887  * </varlistentry>
 888  * <varlistentry>
 889  *   <term>%stylehint_Justification</term>
 890  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
 891  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
 892  *   %stylehint_just_RightFlush.</para></listitem>
 893  * </varlistentry>
 894  * <varlistentry>
 895  *   <term>%stylehint_Size</term>
 896  *   <listitem><para>The font size. Again, this is in a platform-dependent
 897  *   metric.</para>
 898  *   <note><para>Pixels, points, or simply 1 if the library does not support
 899  *   varying font sizes.</para></note>
 900  *   </listitem>
 901  * </varlistentry>
 902  * <varlistentry>
 903  *   <term>%stylehint_Weight</term>
 904  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
 905  *   and -1 for light-weight fonts.</para></listitem>
 906  * </varlistentry>
 907  * <varlistentry>
 908  *   <term>%stylehint_Oblique</term>
 909  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
 910  *   </listitem>
 911  * </varlistentry>
 912  * <varlistentry>
 913  *   <term>%stylehint_Proportional</term>
 914  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
 915  *   </para></listitem>
 916  * </varlistentry>
 917  * <varlistentry>
 918  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
 919  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
 920  *   described in <link
 921  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
 922  *   Appearance of Styles</link>.</para></listitem>
 923  * </varlistentry>
 924  * <varlistentry>
 925  *   <term>%stylehint_ReverseColor</term>
 926  *   <listitem><para>0 for normal printing, 1 if the foreground and background
 927  *   colors are reversed.</para></listitem>
 928  * </varlistentry>
 929  * </variablelist>
 930  *
 931  * Returns: TRUE upon successul retrieval, otherwise FALSE.
 932  */
 933 glui32
 934 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 935 {
 936         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 937         GtkTextTag *tag;
 938
 939         switch(win->type) {
 940         case wintype_TextBuffer:
 941                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 942                 if(result)
 943                         *result = query_tag(tag, win->type, hint);
 944                 break;
 945         case wintype_TextGrid:
 946                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 947                 if(result)
 948                         *result = query_tag(tag, win->type, hint);
 949         default:
 950                 return FALSE;
 951         }
 952
 953         return TRUE;
 954 }
 955
 956 /* Internal function returning the current default font for a window type
 957  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
 958  * supported for now */
 959 PangoFontDescription *
 960 get_current_font(guint32 wintype)
 961 {
 962         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 963         GtkTextTag *normal;
 964
 965         switch(wintype) {
 966         case wintype_TextGrid:
 967                 normal = g_hash_table_lookup(glk_data->current_styles->text_grid, "normal");
 968                 break;
 969         case wintype_TextBuffer:
 970                 normal = g_hash_table_lookup(glk_data->current_styles->text_buffer, "normal");
 971                 break;
 972         default:
 973                 return NULL;
 974         }
 975
 976         PangoFontDescription *font;
 977         g_object_get( G_OBJECT(normal), "font-desc", &font, NULL );
 978
 979         return font;
 980 }
 981
 982 /* Internal function copying the attributes of a text tag to a pango attribute list */
 983 static void
 984 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
 985 {
 986         gboolean set;
 987         GdkColor *foreground, *background;
 988         gchar *string;
 989         PangoFontDescription *font_desc;
 990         gboolean strikethrough;
 991         PangoUnderline underline;
 992
 993         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
 994         if(set) {
 995                 pango_attr_list_insert(
 996                         list,
 997                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
 998                 );
 999         }
1000         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1001         if(set) {
1002                 pango_attr_list_insert(
1003                         list,
1004                         pango_attr_background_new(background->red, background->green, background->blue)
1005                 );
1006         }
1007         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1008         if(set) {
1009                 pango_attr_list_insert(
1010                         list,
1011                         pango_attr_language_new( pango_language_from_string(string) )
1012                 );
1013         }
1014
1015         /* Font description updates the following properties simultaniously:
1016          * family, style, weight, variant, stretch, size
1017          */
1018         g_object_get(tag, "font-desc", &font_desc, NULL);
1019         pango_attr_list_insert(
1020                 list,
1021                 pango_attr_font_desc_new(font_desc)
1022         );
1023
1024         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1025         if(set) {
1026                 pango_attr_list_insert(
1027                         list,
1028                         pango_attr_strikethrough_new(strikethrough)
1029                 );
1030         }
1031         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1032         if(set) {
1033                 pango_attr_list_insert(
1034                         list,
1035                         pango_attr_underline_new(underline)
1036                 );
1037         }
1038 }