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