Add skeleton ChimaraBrowser class
[projects/chimara/chimara.git] / libchimara / style.c
1 #include <stdio.h>
2 #include <string.h>
3 #include <math.h>
4 #include "chimara-glk-private.h"
5 #include "glk.h"
6 #include "style.h"
7 #include "magic.h"
8 #include "stream.h"
9 #include "strio.h"
10
11 extern GPrivate *glk_data_key;
12
13 static gboolean style_accept(GScanner *scanner, GTokenType token);
14 static gboolean style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk);
15 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
16 static void style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table);
17 static void text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list);
18 GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
19 static void style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background);
20
21 /**
22  * glk_set_style:
23  * @styl: The style to apply
24  *
25  * Changes the style of the current output stream. @styl should be one of the
26  * <code>style_</code> constants. However, any value is actually legal; if the 
27  * interpreter does not recognize the style value, it will treat it as 
28  * %style_Normal.
29  * <note><para>
30  *  This policy allows for the future definition of styles without breaking old
31  *  Glk libraries.
32  * </para></note>
33  */
34 void
35 glk_set_style(glui32 styl)
36 {
37         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
38         g_return_if_fail(glk_data->current_stream != NULL);
39         glk_set_style_stream(glk_data->current_stream, styl);
40 }
41
42 /* The first 11 tag names must correspond to the first 11 glk tag names as defined below */
43 static const gchar* TAG_NAMES[] = {
44         "normal",
45         "emphasized",
46         "preformatted",
47         "header",
48         "subheader",
49         "alert",
50         "note",
51         "block-quote",
52         "input",
53         "user1",
54         "user2",
55         "hyperlink",
56         "pager",
57         "default"
58 };
59
60 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
61 static const gchar* GLK_TAG_NAMES[] = {
62         "glk-normal",
63         "glk-emphasized",
64         "glk-preformatted",
65         "glk-header",
66         "glk-subheader",
67         "glk-alert",
68         "glk-note",
69         "glk-block-quote",
70         "glk-input",
71         "glk-user1",
72         "glk-user2"
73 };
74
75 const gchar**
76 style_get_tag_names()
77 {
78         return TAG_NAMES;
79 }
80
81 /* Internal function: mapping from style enum to tag name */
82 static const gchar*
83 get_tag_name(glui32 style)
84 {
85         if(style >= CHIMARA_NUM_STYLES) {
86                 WARNING("Unsupported style");
87                 return "normal";
88         } else {
89                 return (gchar*) TAG_NAMES[style];
90         }
91 }
92
93 /* Internal function: mapping from glk style enum to tag name */
94 static const gchar*
95 get_glk_tag_name(glui32 style)
96 {
97         if(style >= style_NUMSTYLES) {
98                 WARNING("Unsupported style");
99                 return "normal";
100         } else {
101                 return (gchar*) GLK_TAG_NAMES[style];
102         }
103 }
104
105 /** 
106  * glk_set_style_stream:
107  * @str: Output stream to change the style of
108  * @styl: The style to apply
109  *
110  * This changes the style of the stream @str. See glk_set_style().
111  */
112 void
113 glk_set_style_stream(strid_t str, glui32 styl) {
114 #ifdef DEBUG_STYLES
115         g_printf("glk_set_style(str->rock=%d, styl=%d)\n", str->rock, styl);
116 #endif
117
118         if(str->window == NULL)
119                 return;
120
121         flush_window_buffer(str->window);
122         str->style = (gchar*) get_tag_name(styl);
123         str->glk_style = (gchar*) get_glk_tag_name(styl);
124 }
125
126 /* Internal function: call this to initialize the layout of the 'more' prompt. */
127 void
128 style_init_more_prompt(winid_t win)
129 {
130         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
131
132         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
133         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
134 }
135
136 /* Internal function: call this to initialize the default styles to a textbuffer. */
137 void
138 style_init_textbuffer(GtkTextBuffer *buffer)
139 {
140         g_return_if_fail(buffer != NULL);
141
142         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
143
144         /* Place the default text tags in the textbuffer's tag table */
145         g_hash_table_foreach(glk_data->styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
146
147         /* Copy the override text tags to the textbuffers's tag table */
148         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
149
150         /* Assign the 'default' tag the lowest priority */
151         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
152 }
153
154
155 /* Internal function: call this to initialize the default styles to a textgrid. */
156 void
157 style_init_textgrid(GtkTextBuffer *buffer)
158 {
159         g_return_if_fail(buffer != NULL);
160         
161         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
162
163         /* Place the default text tags in the textbuffer's tag table */
164         g_hash_table_foreach(glk_data->styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
165
166         /* Copy the current text tags to the textbuffers's tag table */
167         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
168
169         /* Assign the 'default' tag the lowest priority */
170         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
171 }
172
173 /* Internal function used to iterate over a style table, copying it */
174 static void
175 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
176 {
177         g_return_if_fail(key != NULL);
178         g_return_if_fail(tag != NULL);
179         g_return_if_fail(target_table != NULL);
180
181         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
182 }
183
184 /* Internal function that copies a text tag */
185 GtkTextTag *
186 gtk_text_tag_copy(GtkTextTag *tag)
187 {
188         GtkTextTag *copy;
189
190         g_return_val_if_fail(tag != NULL, NULL);
191
192         copy = gtk_text_tag_new(tag->name);
193         gtk_text_attributes_copy_values(tag->values, copy->values);
194         
195         #define _COPY_FLAG(flag) copy->flag = tag->flag
196                 _COPY_FLAG (bg_color_set);
197                 _COPY_FLAG (bg_color_set);
198                 _COPY_FLAG (bg_stipple_set);
199                 _COPY_FLAG (fg_color_set);
200                 _COPY_FLAG (fg_stipple_set);
201                 _COPY_FLAG (justification_set);
202                 _COPY_FLAG (left_margin_set);
203                 _COPY_FLAG (indent_set);
204                 _COPY_FLAG (rise_set);
205                 _COPY_FLAG (strikethrough_set);
206                 _COPY_FLAG (right_margin_set);
207                 _COPY_FLAG (pixels_above_lines_set);
208                 _COPY_FLAG (pixels_below_lines_set);
209                 _COPY_FLAG (pixels_inside_wrap_set);
210                 _COPY_FLAG (tabs_set);
211                 _COPY_FLAG (underline_set);
212                 _COPY_FLAG (wrap_mode_set);
213                 _COPY_FLAG (bg_full_height_set);
214                 _COPY_FLAG (invisible_set);
215                 _COPY_FLAG (editable_set);
216                 _COPY_FLAG (language_set);
217                 _COPY_FLAG (scale_set);
218         #undef _COPY_FLAG
219
220         /* Copy the data that was added manually */
221         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse-color" );
222
223         if(reverse_color) {
224                 g_object_set_data( G_OBJECT(copy), "reverse-color", reverse_color );
225         }
226
227         return copy;
228 }
229
230 /* Internal function that constructs the default styles */
231 void
232 style_init(ChimaraGlk *glk)
233 {
234         CHIMARA_GLK_USE_PRIVATE(glk, priv);
235         
236         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
237         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
238         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
239         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
240         GtkTextTag *tag;
241
242         PangoFontDescription *default_font_desc = pango_font_description_from_string("Serif");
243         PangoFontDescription *monospace_font_desc = pango_font_description_from_string("Monospace");
244         
245         /* Initialise the default styles for a text grid */
246         tag = gtk_text_tag_new("default");
247         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
248         g_hash_table_insert(default_text_grid_styles, "default", tag);
249
250         tag = gtk_text_tag_new("normal");
251         g_hash_table_insert(default_text_grid_styles, "normal", tag);
252
253         tag = gtk_text_tag_new("emphasized");
254         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
255         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
256
257         tag = gtk_text_tag_new("preformatted");
258         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
259
260         tag = gtk_text_tag_new("header");
261         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
262         g_hash_table_insert(default_text_grid_styles, "header", tag);
263
264         tag = gtk_text_tag_new("subheader");
265         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
266         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
267
268         tag = gtk_text_tag_new("alert");
269         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
270         g_hash_table_insert(default_text_grid_styles, "alert", tag);
271
272         tag = gtk_text_tag_new("note");
273         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
274         g_hash_table_insert(default_text_grid_styles, "note", tag);
275
276         tag = gtk_text_tag_new("block-quote");
277         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
278         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
279
280         tag = gtk_text_tag_new("input");
281         g_hash_table_insert(default_text_grid_styles, "input", tag);
282
283         tag = gtk_text_tag_new("user1");
284         g_hash_table_insert(default_text_grid_styles, "user1", tag);
285
286         tag = gtk_text_tag_new("user2");
287         g_hash_table_insert(default_text_grid_styles, "user2", tag);
288
289         tag = gtk_text_tag_new("hyperlink");
290         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
291         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
292
293         /* Initialise the default styles for a text buffer */
294         tag = gtk_text_tag_new("default");
295         g_object_set(tag, "family", "Serif", "family-set", TRUE, NULL);
296         g_hash_table_insert(default_text_buffer_styles, "default", tag);
297
298         tag = gtk_text_tag_new("normal");
299         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
300
301         tag = gtk_text_tag_new("emphasized");
302         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
303         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
304
305         tag = gtk_text_tag_new("preformatted");
306         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
307         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
308
309         tag = gtk_text_tag_new("header");
310         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
311         g_hash_table_insert(default_text_buffer_styles, "header", tag);
312
313         tag = gtk_text_tag_new("subheader");
314         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
315         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
316
317         tag = gtk_text_tag_new("alert");
318         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
319         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
320
321         tag = gtk_text_tag_new("note");
322         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
323         g_hash_table_insert(default_text_buffer_styles, "note", tag);
324
325         tag = gtk_text_tag_new("block-quote");
326         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
327         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
328
329         tag = gtk_text_tag_new("input");
330         g_hash_table_insert(default_text_buffer_styles, "input", tag);
331
332         tag = gtk_text_tag_new("user1");
333         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
334
335         tag = gtk_text_tag_new("user2");
336         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
337
338         tag = gtk_text_tag_new("hyperlink");
339         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
340         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
341
342         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
343         g_object_set(pager_tag, "family", "Monospace", "family-set", TRUE, "foreground", "#ffffff", "foreground-set", TRUE, "background", "#000000", "background-set", TRUE, NULL);
344         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
345         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
346
347         pango_font_description_free(default_font_desc);
348         pango_font_description_free(monospace_font_desc);
349         
350         priv->styles->text_grid = default_text_grid_styles;
351         priv->styles->text_buffer = default_text_buffer_styles;
352
353
354         /* Initialize the GLK styles to empty tags */
355         int i;
356         for(i=0; i<style_NUMSTYLES; i++) {
357                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
358                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
359                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
360                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
361         }
362
363         priv->glk_styles->text_grid = glk_text_grid_styles;
364         priv->glk_styles->text_buffer = glk_text_buffer_styles;
365
366 }
367
368 /* Reset style tables to the library's internal defaults */
369 void
370 reset_default_styles(ChimaraGlk *glk)
371 {
372         /* TODO: write this function */
373 }
374
375 /* Create the CSS file scanner */
376 GScanner *
377 create_css_file_scanner(void)
378 {
379         GScanner *scanner = g_scanner_new(NULL);
380         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
381         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
382         scanner->config->symbol_2_token = TRUE;
383         scanner->config->cpair_comment_single = NULL;
384         scanner->config->scan_float = FALSE;
385         return scanner;
386 }
387
388 /* Run the scanner over the CSS file, overriding the default styles */
389 void
390 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
391 {
392         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
393                 if( !style_accept_style_selector(scanner, glk) )
394                         break;
395         }
396
397         g_scanner_destroy(scanner);
398
399         /* Update the pager prompt to the new style */
400         style_update(glk);
401 }
402
403 /* Internal function: parses a token */
404 static gboolean
405 style_accept(GScanner *scanner, GTokenType token)
406 {
407         GTokenType next = g_scanner_get_next_token(scanner);
408         if(next != token) {
409                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
410                 return FALSE;
411         }
412         return TRUE;
413 }
414
415 /* Internal function: parses a style selector */
416 static gboolean
417 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
418 {
419         CHIMARA_GLK_USE_PRIVATE(glk, priv);
420
421         GtkTextTag *current_tag;
422         gchar *field;
423         GTokenType token = g_scanner_get_next_token(scanner);
424         GTokenValue value = g_scanner_cur_value(scanner);
425
426         if(
427                 token != G_TOKEN_IDENTIFIER ||
428                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
429         ) {
430                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
431                 return FALSE;
432         }
433
434         field = g_strdup(value.v_identifier);
435
436         /* Parse the tag name to change */
437         if( g_scanner_peek_next_token(scanner) == '{') {
438                 style_accept(scanner, '{');
439                 if( !strcmp(field, "buffer") )
440                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
441                 else
442                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
443         } else {
444                 if( !style_accept(scanner, '.') )
445                         return FALSE;
446
447                 token = g_scanner_get_next_token(scanner);
448                 value = g_scanner_cur_value(scanner);
449
450                 if(token != G_TOKEN_IDENTIFIER) {
451                         g_scanner_error(scanner, "CSS Error: style selector expected");
452                         return FALSE;
453                 }
454
455                 if( !strcmp(field, "buffer") )
456                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
457                 else
458                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
459
460                 if(current_tag == NULL) {
461                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
462                         return FALSE;
463                 }
464
465                 if( !style_accept(scanner, '{') )
466                         return FALSE;
467         }
468
469         while( g_scanner_peek_next_token(scanner) != '}') {
470                 if( !style_accept_style_hint(scanner, current_tag) )
471                         return FALSE;
472         }
473                 
474         if( !style_accept(scanner, '}') )
475                 return FALSE;
476
477         return TRUE;
478 }
479
480 /* Internal function: parses a style hint */
481 static gboolean
482 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
483 {
484         GTokenType token = g_scanner_get_next_token(scanner);
485         GTokenValue value = g_scanner_cur_value(scanner);
486         gchar *hint;
487
488         if(token != G_TOKEN_IDENTIFIER) {
489                 g_scanner_error(scanner, "CSS Error: style hint expected");
490                 return FALSE;
491         }
492
493         hint = g_strdup(value.v_identifier);
494
495         if( !style_accept(scanner, ':') )
496                 return FALSE;
497
498         token = g_scanner_get_next_token(scanner);
499         value = g_scanner_cur_value(scanner);
500
501         if( !strcmp(hint, "font-family") ) {
502                 if(token != G_TOKEN_STRING) {
503                         g_scanner_error(scanner, "CSS Error: string expected");
504                         return FALSE;
505                 }
506                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
507         }
508         else if( !strcmp(hint, "font-weight") ) {
509                 if(token != G_TOKEN_IDENTIFIER) {
510                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
511                         return FALSE;
512                 }
513
514                 if( !strcmp(value.v_identifier, "bold") )
515                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
516                 else if( !strcmp(value.v_identifier, "normal") )
517                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
518                 else {
519                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
520                         return FALSE;
521                 }
522         }
523         else if( !strcmp(hint, "font-style") ) {
524                 if(token != G_TOKEN_IDENTIFIER) {
525                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
526                         return FALSE;
527                 }
528
529                 if( !strcmp(value.v_identifier, "italic") )
530                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
531                 else if( !strcmp(value.v_identifier, "normal") )
532                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
533                 else {
534                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
535                         return FALSE;
536                 }
537         }
538         else if( !strcmp(hint, "font-size") ) {
539                 if(token == G_TOKEN_INT) 
540                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
541                 else if(token == G_TOKEN_FLOAT)
542                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
543                 else {
544                         g_scanner_error(scanner, "CSS Error: integer or float expected");
545                         return FALSE;
546                 }
547         }
548         else if( !strcmp(hint, "color") ) {
549                 if(token != G_TOKEN_IDENTIFIER) {
550                         g_scanner_error(scanner, "CSS Error: hex color expected");
551                         return FALSE;
552                 }
553
554                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
555         }
556         else if( !strcmp(hint, "background-color") ) {
557                 if(token != G_TOKEN_IDENTIFIER) {
558                         g_scanner_error(scanner, "CSS Error: hex color expected");
559                         return FALSE;
560                 }
561                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
562         }
563         else if( !strcmp(hint, "text-align") ) {
564                 if(token != G_TOKEN_IDENTIFIER) {
565                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
566                         return FALSE;
567                 }
568                 
569                 if( !strcmp(value.v_identifier, "left") )
570                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
571                 else if( !strcmp(value.v_identifier, "right") )
572                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
573                 else if( !strcmp(value.v_identifier, "center") )
574                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
575                 else {
576                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
577                         return FALSE;
578                 }
579         }
580         else if( !strcmp(hint, "margin-left") ) {
581                 if(token != G_TOKEN_INT) {
582                         g_scanner_error(scanner, "CSS Error: integer expected");
583                         return FALSE;
584                 }
585                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
586         }
587         else if( !strcmp(hint, "margin-right") ) {
588                 if(token != G_TOKEN_INT) {
589                         g_scanner_error(scanner, "CSS Error: integer expected");
590                         return FALSE;
591                 }
592                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
593         }
594         else if( !strcmp(hint, "margin-top") ) {
595                 if(token != G_TOKEN_INT) {
596                         g_scanner_error(scanner, "CSS Error: integer expected");
597                         return FALSE;
598                 }
599                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
600         }
601         else if( !strcmp(hint, "margin-bottom") ) {
602                 if(token != G_TOKEN_INT) {
603                         g_scanner_error(scanner, "CSS Error: integer expected");
604                         return FALSE;
605                 }
606                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
607         }
608                 
609         else {
610                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
611                 return FALSE;
612         }
613
614         if( !style_accept(scanner, ';') )
615                 return FALSE;
616
617         return TRUE;
618 }
619
620 /* Internal function: parses a glk color to a GdkColor */
621 void
622 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
623 {
624         color->red = 256 * ((val & 0xff0000) >> 16);
625         color->green = 256 * ((val & 0x00ff00) >> 8);
626         color->blue = 256 * (val & 0x0000ff);
627 }
628
629 /* Internal function: parses a glk color to a hex string */
630 gchar*
631 glkcolor_to_hex(glui32 val)
632 {
633         return g_strdup_printf("%04X%04X%04X",
634                 256 * ((val & 0xff0000) >> 16),
635                 256 * ((val & 0x00ff00) >> 8),
636                 256 * (val & 0x0000ff)
637         );
638 }
639
640 /* Internal function: parses a gdk color to a hex string */
641 gchar*
642 gdkcolor_to_hex(GdkColor *color)
643 {
644         return g_strdup_printf("%04X%04X%04X",
645                 color->red, color->green, color->blue
646         );
647 }
648
649 /* Internal function: parses a GdkColor to a glk color */
650 static glui32
651 gdkcolor_to_glkcolor(GdkColor *color)
652 {
653         g_return_val_if_fail(color != NULL, 0);
654         return (glui32) color->pixel;
655 }
656
657 /* Internal function: changes a GTK tag to correspond with the given style. */
658 static void
659 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
660 {
661         g_return_if_fail(tag != NULL);
662
663         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
664         GObject *tag_object = G_OBJECT(tag);
665
666         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
667
668         int i = 0;
669         GdkColor color;
670         switch(hint) {
671         case stylehint_Indentation:
672                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
673                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
674                 break;
675         
676         case stylehint_ParaIndentation:
677                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
678                 break;
679
680         case stylehint_Justification:
681                 switch(val) {
682                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
683                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
684                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
685                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
686                         default: 
687                                 WARNING("Unknown justification");
688                                 i = GTK_JUSTIFY_LEFT;
689                 }
690                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
691                 break;
692
693         case stylehint_Weight:
694                 switch(val) {
695                         case -1: i = PANGO_WEIGHT_LIGHT; break;
696                         case  0: i = PANGO_WEIGHT_NORMAL; break;
697                         case  1: i = PANGO_WEIGHT_BOLD; break;
698                         default: WARNING("Unknown font weight");
699                 }
700                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
701                 break;
702
703         case stylehint_Size:
704                 {
705                         gdouble scale = PANGO_SCALE_MEDIUM;
706                         switch(val) {
707                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
708                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
709                                 case -1: scale = PANGO_SCALE_SMALL; break;
710                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
711                                 case  1: scale = PANGO_SCALE_LARGE; break;
712                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
713                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
714                                 default:
715                                         /* We follow Pango's convention of having each magnification
716                                         step be a scaling of 1.2 */
717                                         scale = pow(1.2, (double)val);
718                         }
719                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
720                 }
721                 break;
722
723         case stylehint_Oblique:
724                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
725                 break;
726
727         case stylehint_Proportional:
728         {
729                 gchar *font_family;
730                 gboolean family_set;
731
732                 if(wintype != wintype_TextBuffer) {
733                         if(val)
734                                 WARNING("Style hint 'propotional' only supported on text buffers.");
735
736                         break;
737                 }
738
739                 GtkTextTag *font_tag = g_hash_table_lookup(glk_data->styles->text_buffer, val? "default" : "preformatted");
740                 g_object_get(font_tag, "family", &font_family, "family-set", &family_set, NULL);
741                 g_object_set(tag_object, "family", font_family, "family-set", family_set, NULL);
742                 g_free(font_family);
743         }
744                 break;
745
746         case stylehint_TextColor:
747                 glkcolor_to_gdkcolor(val, &color);
748
749                 if(!reverse_color)
750                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
751                 else
752                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
753
754                 break;
755
756         case stylehint_BackColor:
757                 glkcolor_to_gdkcolor(val, &color);
758
759                 if(!reverse_color)
760                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
761                 else
762                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
763
764                 break;
765
766         case stylehint_ReverseColor:
767         {
768                 // Determine the current colors
769                 
770                 // If all fails, use black/white
771                 // FIXME: Use system theme here
772                 GdkColor foreground, background;
773                 gdk_color_parse("black", &foreground);
774                 gdk_color_parse("white", &background);
775                 GdkColor *current_foreground = &foreground;
776                 GdkColor *current_background = &background;
777
778                 if(wintype == wintype_TextBuffer) {
779                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
780                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
781                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
782                 }
783                 else if(wintype == wintype_TextGrid) {
784                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
785                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
786                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
787                 }
788
789                 if(val) {
790                         /* Flip the fore- and background colors */
791                         GdkColor *temp = current_foreground;
792                         current_foreground = current_background;
793                         current_background = temp;
794                 }
795
796                 g_object_set(tag,
797                         "foreground-gdk", current_foreground,
798                         "foreground-set", TRUE,
799                         "background-gdk", current_background,
800                         "background-set", TRUE,
801                         NULL
802                 );
803
804                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
805                 break;
806         }
807
808         default:
809                 WARNING("Unknown style hint");
810         }
811 }
812
813 /* Internal function: queries a text tag for the value of a given style hint */
814 static gint
815 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
816 {
817         gint intval;
818         gdouble doubleval;
819         GdkColor *colval;
820
821         g_return_val_if_fail(tag != NULL, 0);
822
823         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
824
825         switch(hint) {
826         case stylehint_Indentation:
827                 g_object_get(tag, "left_margin", &intval, NULL);
828                 return intval/5;
829         
830         case stylehint_ParaIndentation:
831                 g_object_get(tag, "indent", &intval, NULL);
832                 return intval/5;
833
834         case stylehint_Justification:
835                 g_object_get(tag, "justification", &intval, NULL);
836                 switch(intval) {
837                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
838                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
839                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
840                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
841                         default: 
842                                 WARNING("Unknown justification");
843                                 return stylehint_just_LeftFlush;
844                 }
845
846         case stylehint_Weight:
847                 g_object_get(tag, "weight", &intval, NULL);
848                 switch(intval) {
849                         case PANGO_WEIGHT_LIGHT: return -1;
850                         case PANGO_WEIGHT_NORMAL: return 0;
851                         case PANGO_WEIGHT_BOLD: return 1;
852                         default: WARNING("Unknown font weight"); return 0;
853                 }
854
855         case stylehint_Size:
856                 g_object_get(tag, "scale", &doubleval, NULL);
857                 return (gint)round(log(doubleval) / log(1.2));
858
859         case stylehint_Oblique:
860                 g_object_get(tag, "style", &intval , NULL);
861                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
862
863         case stylehint_Proportional:
864                 /* Use pango_font_family_is_monospace()? */
865         {
866                 gchar *font_family, *query_font_family;
867                 GtkTextTag *font_tag = g_hash_table_lookup(
868                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
869                     "preformatted");
870                 g_object_get(font_tag, "family", &font_family, NULL);
871                 g_object_get(tag, "family", &query_font_family, NULL);
872                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
873                 g_free(font_family);
874                 g_free(query_font_family);
875                 return retval;
876         }
877
878         case stylehint_TextColor:
879                 g_object_get(tag, "foreground-gdk", &colval, NULL);
880                 return gdkcolor_to_glkcolor(colval);
881
882         case stylehint_BackColor:
883                 g_object_get(tag, "background-gdk", &colval, NULL);
884                 return gdkcolor_to_glkcolor(colval);
885
886         case stylehint_ReverseColor:
887                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
888
889         default:
890                 WARNING("Unknown style hint");
891         }
892         
893         return 0;
894 }
895
896 /**
897  * glk_stylehint_set:
898  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
899  * @styl: The style to set a hint for.
900  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
901  * @val: The style hint. The meaning of this depends on @hint.
902  *
903  * Sets a hint about the appearance of one style for a particular type of 
904  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for 
905  * all types of window.
906  * <note><para>
907  *  There is no equivalent constant to set a hint for all styles of a single 
908  *  window type.
909  * </para></note>
910  */
911 void
912 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
913 {
914 #ifdef DEBUG_STYLES
915         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
916 #endif
917
918         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
919
920         GtkTextTag *to_change;
921         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
922                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
923                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
924         }
925
926         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
927                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
928                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
929         }
930 }
931
932 /**
933  * glk_stylehint_clear:
934  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
935  * @styl: The style to set a hint for.
936  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
937  *
938  * Clears a hint about the appearance of one style for a particular type of 
939  * window to its default value. You can also set @wintype to %wintype_AllTypes, 
940  * which clears a hint for all types of window.
941  * <note><para>
942  *  There is no equivalent constant to reset a hint for all styles of a single 
943  *  window type.
944  * </para></note>
945  */
946 void
947 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
948 {
949 #ifdef DEBUG_STYLES
950         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
951 #endif
952
953         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
954         GtkTextTag *tag;
955
956         switch(wintype) {
957         case wintype_TextBuffer:
958                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
959                 if(tag) {
960                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
961                 }
962                 break;
963         case wintype_TextGrid:
964                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
965                 if(tag) {
966                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
967                 }
968         default:
969                 return;
970         }
971 }
972
973 /**
974  * glk_style_distinguish:
975  * @win: The window in which the styles are to be distinguished.
976  * @styl1: The first style to be distinguished from the second style.
977  * @styl2: The second style to be distinguished from the first style.
978  * 
979  * Decides whether two styles are visually distinguishable in the given window.
980  * The exact meaning of this is left for the library to determine.
981  * <note><title>Chimara</title><para>
982  *   Currently, all styles of one window are assumed to be mutually
983  *   distinguishable.
984  * </para></note>
985  * 
986  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they 
987  * are not, it returns %FALSE (0).
988  */
989 glui32
990 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
991 {
992 #ifdef DEBUG_STYLES
993         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
994 #endif
995
996         /* FIXME */
997         return styl1 != styl2;
998 }
999
1000 /**
1001  * glk_style_measure:
1002  * @win: The window from which to take the style.
1003  * @styl: The style to perform the measurement on.
1004  * @hint: The stylehint to measure.
1005  * @result: Address to write the result to.
1006  * 
1007  * Tries to test an attribute of one style in the given window @win. The library
1008  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1009  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1010  * at by @result. 
1011  * <note><para>
1012  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1013  * </para></note>
1014  *
1015  * The meaning of the value depends on the hint which was tested:
1016  * <variablelist>
1017  * <varlistentry>
1018  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1019  *   <listitem><para>The indentation and paragraph indentation. These are in a
1020  *   metric which is platform-dependent.</para>
1021  *   <note><para>Most likely either characters or pixels.</para></note>
1022  *   </listitem>
1023  * </varlistentry>
1024  * <varlistentry>
1025  *   <term>%stylehint_Justification</term>
1026  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1027  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1028  *   %stylehint_just_RightFlush.</para></listitem>
1029  * </varlistentry>
1030  * <varlistentry>
1031  *   <term>%stylehint_Size</term>
1032  *   <listitem><para>The font size. Again, this is in a platform-dependent
1033  *   metric.</para>
1034  *   <note><para>Pixels, points, or simply 1 if the library does not support
1035  *   varying font sizes.</para></note>
1036  *   </listitem>
1037  * </varlistentry>
1038  * <varlistentry>
1039  *   <term>%stylehint_Weight</term>
1040  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1041  *   and -1 for light-weight fonts.</para></listitem>
1042  * </varlistentry>
1043  * <varlistentry>
1044  *   <term>%stylehint_Oblique</term>
1045  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1046  *   </listitem>
1047  * </varlistentry>
1048  * <varlistentry>
1049  *   <term>%stylehint_Proportional</term>
1050  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1051  *   </para></listitem>
1052  * </varlistentry>
1053  * <varlistentry>
1054  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1055  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1056  *   described in <link 
1057  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1058  *   Appearance of Styles</link>.</para></listitem>
1059  * </varlistentry>
1060  * <varlistentry>
1061  *   <term>%stylehint_ReverseColor</term>
1062  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1063  *   colors are reversed.</para></listitem>
1064  * </varlistentry>
1065  * </variablelist>
1066  * Signed values, such as the %stylehint_Weight value, are cast to
1067  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1068  * in a more natural context.
1069  * 
1070  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1071  */
1072 glui32
1073 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1074 {
1075 #ifdef DEBUG_STYLES
1076         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1077 #endif
1078
1079         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1080         GtkTextTag *tag;
1081
1082         switch(win->type) {
1083         case wintype_TextBuffer:
1084                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1085                 if(result)
1086                         *result = query_tag(tag, win->type, hint);
1087                 break;
1088         case wintype_TextGrid:
1089                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1090                 if(result)
1091                         *result = query_tag(tag, win->type, hint);
1092         default:
1093                 return FALSE;
1094         }
1095
1096         return TRUE;
1097 }
1098
1099 /* Internal function returning the current default font for a window type
1100  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1101  * supported for now */
1102 PangoFontDescription *
1103 get_current_font(guint32 wintype)
1104 {
1105         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1106         GtkTextTag *tag;
1107
1108         switch(wintype) {
1109         case wintype_TextGrid:
1110                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1111                 break;
1112         case wintype_TextBuffer:
1113                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1114                 break;
1115         default:
1116                 return NULL;
1117         }
1118
1119         PangoFontDescription *font;
1120         g_object_get( G_OBJECT(tag), "font-desc", &font, NULL );
1121
1122         return font;
1123 }
1124
1125 /* Internal function copying the attributes of a text tag to a pango attribute list */
1126 static void
1127 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1128 {
1129         gboolean set;
1130         GdkColor *foreground, *background;
1131         gchar *string;
1132         PangoFontDescription *font_desc;
1133         gboolean strikethrough;
1134         PangoUnderline underline;
1135
1136         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1137         if(set) {
1138                 pango_attr_list_insert(
1139                         list,
1140                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1141                 );
1142         }
1143         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1144         if(set) {
1145                 pango_attr_list_insert(
1146                         list,
1147                         pango_attr_background_new(background->red, background->green, background->blue)
1148                 );
1149         }
1150         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1151         if(set) {
1152                 pango_attr_list_insert(
1153                         list,
1154                         pango_attr_language_new( pango_language_from_string(string) )
1155                 );
1156         }
1157
1158         /* Font description updates the following properties simultaniously:
1159          * family, style, weight, variant, stretch, size
1160          */
1161         g_object_get(tag, "font-desc", &font_desc, NULL);
1162         pango_attr_list_insert(
1163                 list,
1164                 pango_attr_font_desc_new(font_desc)
1165         );
1166
1167         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1168         if(set) {
1169                 pango_attr_list_insert(
1170                         list,
1171                         pango_attr_strikethrough_new(strikethrough)
1172                 );
1173         }
1174         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1175         if(set) {
1176                 pango_attr_list_insert(
1177                         list,
1178                         pango_attr_underline_new(underline)
1179                 );
1180         }
1181 }
1182
1183 /* Update pager tag */
1184 void
1185 style_update(ChimaraGlk *glk)
1186 {
1187         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1188
1189         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1190         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1191 }
1192
1193 /* Determine the current colors used to render the text for a given stream. 
1194  * This can be set in a number of places */
1195 static void
1196 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1197 {
1198         gboolean foreground_set = FALSE;
1199         gboolean background_set = FALSE;
1200         gint reverse_color;
1201
1202         // Default color
1203         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1204         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1205         if(foreground_set)
1206                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1207         if(background_set)
1208                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1209
1210         // Player defined color
1211         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1212         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1213         if(foreground_set)
1214                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1215         if(background_set)
1216                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1217
1218         // GLK defined color
1219         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1220         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1221         if(foreground_set)
1222                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1223         if(background_set)
1224                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1225
1226 }
1227
1228 /* Determine the current colors used to render the text for a given stream. 
1229  * This can be set in a number of places */
1230 void
1231 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1232 {
1233         VALID_STREAM(str, return);
1234         g_return_if_fail(str->window != NULL);
1235         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1236         
1237         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) ); 
1238         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1239         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1240         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1241         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1242
1243         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1244
1245         gboolean foreground_set, background_set;
1246
1247         // Windows can have zcolors defined
1248         if(str->window->zcolor) {
1249                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1250                 if(foreground_set)
1251                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1252                 if(background_set)
1253                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1254         }
1255 }