source: fmtext.c @ 7e111f4

release-1.8release-1.9
Last change on this file since 7e111f4 was 7e111f4, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Replace owl_fmtext's buffer management with GString reallocs are hard. Let's go shopping^Wuse GString!
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File size: 28.0 KB
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1#include "owl.h"
2#include <stdlib.h>
3#include <string.h>
4
5/* initialize an fmtext with no data */
6void owl_fmtext_init_null(owl_fmtext *f)
7{
8  f->buff = g_string_new("");
9  f->default_attrs = OWL_FMTEXT_ATTR_NONE;
10  f->default_fgcolor = OWL_COLOR_DEFAULT;
11  f->default_bgcolor = OWL_COLOR_DEFAULT;
12}
13
14/* Clear the data from an fmtext, but don't deallocate memory. This
15   fmtext can then be appended to again. */
16void owl_fmtext_clear(owl_fmtext *f)
17{
18  g_string_truncate(f->buff, 0);
19  f->default_attrs = OWL_FMTEXT_ATTR_NONE;
20  f->default_fgcolor = OWL_COLOR_DEFAULT;
21  f->default_bgcolor = OWL_COLOR_DEFAULT;
22}
23
24int owl_fmtext_is_format_char(gunichar c)
25{
26  if ((c & ~OWL_FMTEXT_UC_ATTR_MASK) == OWL_FMTEXT_UC_ATTR) return 1;
27  if ((c & ~(OWL_FMTEXT_UC_ALLCOLOR_MASK)) == OWL_FMTEXT_UC_COLOR_BASE) return 1;
28  return 0;
29}
30/* append text to the end of 'f' with attribute 'attr' and color
31 * 'color'
32 */
33void owl_fmtext_append_attr(owl_fmtext *f, const char *text, char attr, short fgcolor, short bgcolor)
34{
35  int a = 0, fg = 0, bg = 0;
36 
37  if (attr != OWL_FMTEXT_ATTR_NONE) a=1;
38  if (fgcolor != OWL_COLOR_DEFAULT) fg=1;
39  if (bgcolor != OWL_COLOR_DEFAULT) bg=1;
40
41  /* Set attributes */
42  if (a)
43    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_ATTR | attr);
44  if (fg)
45    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_FGCOLOR | fgcolor);
46  if (bg)
47    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_BGCOLOR | bgcolor);
48
49  g_string_append(f->buff, text);
50
51  /* Reset attributes */
52  if (bg) g_string_append(f->buff, OWL_FMTEXT_UTF8_BGDEFAULT);
53  if (fg) g_string_append(f->buff, OWL_FMTEXT_UTF8_FGDEFAULT);
54  if (a)  g_string_append(f->buff, OWL_FMTEXT_UTF8_ATTR_NONE);
55}
56
57/* Append normal, uncolored text 'text' to 'f' */
58void owl_fmtext_append_normal(owl_fmtext *f, const char *text)
59{
60  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
61}
62
63/* Append normal, uncolored text specified by format string to 'f' */
64void owl_fmtext_appendf_normal(owl_fmtext *f, const char *fmt, ...)
65{
66  va_list ap;
67  char *buff;
68
69  va_start(ap, fmt);
70  buff = g_strdup_vprintf(fmt, ap);
71  va_end(ap);
72  if (!buff)
73    return;
74  owl_fmtext_append_attr(f, buff, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
75  owl_free(buff);
76}
77
78/* Append normal text 'text' to 'f' with color 'color' */
79void owl_fmtext_append_normal_color(owl_fmtext *f, const char *text, int fgcolor, int bgcolor)
80{
81  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, fgcolor, bgcolor);
82}
83
84/* Append bold text 'text' to 'f' */
85void owl_fmtext_append_bold(owl_fmtext *f, const char *text)
86{
87  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
88}
89
90/* Append reverse video text 'text' to 'f' */
91void owl_fmtext_append_reverse(owl_fmtext *f, const char *text)
92{
93  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
94}
95
96/* Append reversed and bold, uncolored text 'text' to 'f' */
97void owl_fmtext_append_reversebold(owl_fmtext *f, const char *text)
98{
99  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE | OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
100}
101
102/* Add the attribute 'attr' to the default atts for the text in 'f' */
103void owl_fmtext_addattr(owl_fmtext *f, char attr)
104{
105  /* add the attribute to all text */
106  f->default_attrs |= attr;
107}
108
109/* Set the default foreground color for this fmtext to 'color'.
110 * Only affects text that is colored default.
111 */
112void owl_fmtext_colorize(owl_fmtext *f, int color)
113{
114  f->default_fgcolor = color;
115}
116
117/* Set the default foreground color for this fmtext to 'color'.
118 * Only affects text that is colored default.
119 */
120void owl_fmtext_colorizebg(owl_fmtext *f, int color)
121{
122  f->default_bgcolor = color;
123}
124
125/* Internal function. Parse attrbute character. */
126static void _owl_fmtext_update_attributes(gunichar c, char *attr, short *fgcolor, short *bgcolor)
127{
128  if ((c & OWL_FMTEXT_UC_ATTR) == OWL_FMTEXT_UC_ATTR) {
129    *attr = c & OWL_FMTEXT_UC_ATTR_MASK;
130  }
131  else if ((c & OWL_FMTEXT_UC_COLOR_BASE) == OWL_FMTEXT_UC_COLOR_BASE) {
132    if ((c & OWL_FMTEXT_UC_BGCOLOR) == OWL_FMTEXT_UC_BGCOLOR) {
133      *bgcolor = (c == OWL_FMTEXT_UC_BGDEFAULT
134                  ? OWL_COLOR_DEFAULT
135                  : c & OWL_FMTEXT_UC_COLOR_MASK);
136    }
137    else if ((c & OWL_FMTEXT_UC_FGCOLOR) == OWL_FMTEXT_UC_FGCOLOR) {
138      *fgcolor = (c == OWL_FMTEXT_UC_FGDEFAULT
139                  ? OWL_COLOR_DEFAULT
140                  : c & OWL_FMTEXT_UC_COLOR_MASK);
141    }
142  }
143}
144
145/* Internal function. Scan for attribute characters. */
146static void _owl_fmtext_scan_attributes(const owl_fmtext *f, int start, char *attr, short *fgcolor, short *bgcolor)
147{
148  const char *p;
149  p = strchr(f->buff->str, OWL_FMTEXT_UC_STARTBYTE_UTF8);
150  while (p && p < f->buff->str + start) {
151    _owl_fmtext_update_attributes(g_utf8_get_char(p), attr, fgcolor, bgcolor);
152    p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
153  }
154} 
155
156/* Internal function.  Append text from 'in' between index 'start'
157 * inclusive and 'stop' exclusive, to the end of 'f'. This function
158 * works with bytes.
159 */
160static void _owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in, int start, int stop)
161{
162  int a = 0, fg = 0, bg = 0;
163  char attr = 0;
164  short fgcolor = OWL_COLOR_DEFAULT;
165  short bgcolor = OWL_COLOR_DEFAULT;
166
167  _owl_fmtext_scan_attributes(in, start, &attr, &fgcolor, &bgcolor);
168  if (attr != OWL_FMTEXT_ATTR_NONE) a=1;
169  if (fgcolor != OWL_COLOR_DEFAULT) fg=1;
170  if (bgcolor != OWL_COLOR_DEFAULT) bg=1;
171
172  if (a)
173    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_ATTR | attr);
174  if (fg)
175    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_FGCOLOR | fgcolor);
176  if (bg)
177    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_BGCOLOR | bgcolor);
178
179  g_string_append_len(f->buff, in->buff->str+start, stop-start);
180
181  /* Reset attributes */
182  g_string_append(f->buff, OWL_FMTEXT_UTF8_BGDEFAULT);
183  g_string_append(f->buff, OWL_FMTEXT_UTF8_FGDEFAULT);
184  g_string_append(f->buff, OWL_FMTEXT_UTF8_ATTR_NONE);
185}
186
187/* append fmtext 'in' to 'f' */
188void owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in)
189{
190  _owl_fmtext_append_fmtext(f, in, 0, in->buff->len);
191
192}
193
194/* Append 'nspaces' number of spaces to the end of 'f' */
195void owl_fmtext_append_spaces(owl_fmtext *f, int nspaces)
196{
197  int i;
198  for (i=0; i<nspaces; i++) {
199    owl_fmtext_append_normal(f, " ");
200  }
201}
202
203/* Return a plain version of the fmtext.  Caller is responsible for
204 * freeing the return
205 */
206char *owl_fmtext_print_plain(const owl_fmtext *f)
207{
208  return owl_strip_format_chars(f->buff->str);
209}
210
211static void _owl_fmtext_wattrset(WINDOW *w, int attrs)
212{
213  wattrset(w, A_NORMAL);
214  if (attrs & OWL_FMTEXT_ATTR_BOLD) wattron(w, A_BOLD);
215  if (attrs & OWL_FMTEXT_ATTR_REVERSE) wattron(w, A_REVERSE);
216  if (attrs & OWL_FMTEXT_ATTR_UNDERLINE) wattron(w, A_UNDERLINE);
217}
218
219static void _owl_fmtext_update_colorpair(short fg, short bg, short *pair)
220{
221  if (owl_global_get_hascolors(&g)) {
222    *pair = owl_fmtext_get_colorpair(fg, bg);
223  }
224}
225
226static void _owl_fmtext_wcolor_set(WINDOW *w, short pair)
227{
228  if (owl_global_get_hascolors(&g)) {
229      wcolor_set(w,pair,NULL);
230      wbkgdset(w, COLOR_PAIR(pair));
231  }
232}
233
234/* add the formatted text to the curses window 'w'.  The window 'w'
235 * must already be initiatlized with curses
236 */
237static void _owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w, int do_search)
238{
239  /* char *tmpbuff; */
240  /* int position, trans1, trans2, trans3, len, lastsame; */
241  char *s, *p;
242  char attr;
243  short fg, bg, pair = 0;
244 
245  if (w==NULL) {
246    owl_function_debugmsg("Hit a null window in owl_fmtext_curs_waddstr.");
247    return;
248  }
249
250  s = f->buff->str;
251  /* Set default attributes. */
252  attr = f->default_attrs;
253  fg = f->default_fgcolor;
254  bg = f->default_bgcolor;
255  _owl_fmtext_wattrset(w, attr);
256  _owl_fmtext_update_colorpair(fg, bg, &pair);
257  _owl_fmtext_wcolor_set(w, pair);
258
259  /* Find next possible format character. */
260  p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
261  while(p) {
262    if (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
263      /* Deal with all text from last insert to here. */
264      char tmp;
265   
266      tmp = p[0];
267      p[0] = '\0';
268      if (do_search && owl_global_is_search_active(&g)) {
269        /* Search is active, so highlight search results. */
270        int start, end;
271        while (owl_regex_compare(owl_global_get_search_re(&g), s, &start, &end) == 0) {
272          /* Prevent an infinite loop matching the empty string. */
273          if (end == 0)
274            break;
275
276          /* Found search string, highlight it. */
277
278          waddnstr(w, s, start);
279
280          _owl_fmtext_wattrset(w, attr ^ OWL_FMTEXT_ATTR_REVERSE);
281          _owl_fmtext_wcolor_set(w, pair);
282         
283          waddnstr(w, s + start, end - start);
284
285          _owl_fmtext_wattrset(w, attr);
286          _owl_fmtext_wcolor_set(w, pair);
287
288          s += end;
289        }
290      }
291      /* Deal with remaining part of string. */
292      waddstr(w, s);
293      p[0] = tmp;
294
295      /* Deal with new attributes. Initialize to defaults, then
296         process all consecutive formatting characters. */
297      attr = f->default_attrs;
298      fg = f->default_fgcolor;
299      bg = f->default_bgcolor;
300      while (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
301        _owl_fmtext_update_attributes(g_utf8_get_char(p), &attr, &fg, &bg);
302        p = g_utf8_next_char(p);
303      }
304      _owl_fmtext_wattrset(w, attr | f->default_attrs);
305      if (fg == OWL_COLOR_DEFAULT) fg = f->default_fgcolor;
306      if (bg == OWL_COLOR_DEFAULT) bg = f->default_bgcolor;
307      _owl_fmtext_update_colorpair(fg, bg, &pair);
308      _owl_fmtext_wcolor_set(w, pair);
309
310      /* Advance to next non-formatting character. */
311      s = p;
312      p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
313    }
314    else {
315      p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
316    }
317  }
318  if (s) {
319    waddstr(w, s);
320  }
321  wbkgdset(w, 0);
322}
323
324void owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w)
325{
326  _owl_fmtext_curs_waddstr(f, w, 1);
327}
328
329void owl_fmtext_curs_waddstr_without_search(const owl_fmtext *f, WINDOW *w)
330{
331  _owl_fmtext_curs_waddstr(f, w, 0);
332}
333
334/* Expands tabs. Tabs are expanded as if given an initial indent of start. */
335void owl_fmtext_expand_tabs(const owl_fmtext *in, owl_fmtext *out, int start) {
336  int col = start, numcopied = 0;
337  char *ptr;
338
339  /* Copy the default attributes. */
340  out->default_attrs = in->default_attrs;
341  out->default_fgcolor = in->default_fgcolor;
342  out->default_bgcolor = in->default_bgcolor;
343
344  for (ptr = in->buff->str;
345       ptr < in->buff->str + in->buff->len;
346       ptr = g_utf8_next_char(ptr)) {
347    gunichar c = g_utf8_get_char(ptr);
348    int chwidth;
349    if (c == '\t') {
350      /* Copy up to this tab */
351      _owl_fmtext_append_fmtext(out, in, numcopied, ptr - in->buff->str);
352      /* and then copy spaces for the tab. */
353      chwidth = OWL_TAB_WIDTH - (col % OWL_TAB_WIDTH);
354      owl_fmtext_append_spaces(out, chwidth);
355      col += chwidth;
356      numcopied = g_utf8_next_char(ptr) - in->buff->str;
357    } else {
358      /* Just update col. We'll append later. */
359      if (c == '\n') {
360        col = start;
361      } else if (!owl_fmtext_is_format_char(c)) {
362        col += mk_wcwidth(c);
363      }
364    }
365  }
366  /* Append anything we've missed. */
367  if (numcopied < in->buff->len)
368    _owl_fmtext_append_fmtext(out, in, numcopied, in->buff->len);
369}
370
371/* start with line 'aline' (where the first line is 0) and print
372 * 'lines' number of lines into 'out'
373 */
374int owl_fmtext_truncate_lines(const owl_fmtext *in, int aline, int lines, owl_fmtext *out)
375{
376  const char *ptr1, *ptr2;
377  int i, offset;
378 
379  /* find the starting line */
380  ptr1 = in->buff->str;
381  for (i = 0; i < aline; i++) {
382    ptr1 = strchr(ptr1, '\n');
383    if (!ptr1) return(-1);
384    ptr1++;
385  }
386 
387  /* ptr1 now holds the starting point */
388
389  /* copy the default attributes */
390  out->default_attrs = in->default_attrs;
391  out->default_fgcolor = in->default_fgcolor;
392  out->default_bgcolor = in->default_bgcolor;
393   
394  /* copy in the next 'lines' lines */
395  if (lines < 1) return(-1);
396
397  for (i = 0; i < lines; i++) {
398    offset = ptr1 - in->buff->str;
399    ptr2 = strchr(ptr1, '\n');
400    if (!ptr2) {
401      /* Copy to the end of the buffer. */
402      _owl_fmtext_append_fmtext(out, in, offset, in->buff->len);
403      return(-1);
404    }
405    /* Copy up to, and including, the new line. */
406    _owl_fmtext_append_fmtext(out, in, offset, (ptr2 - ptr1) + offset + 1);
407    ptr1 = ptr2 + 1;
408  }
409  return(0);
410}
411
412/* Implementation of owl_fmtext_truncate_cols. Does not support tabs in input. */
413void _owl_fmtext_truncate_cols_internal(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
414{
415  const char *ptr_s, *ptr_e, *ptr_c, *last;
416  int col, st, padding, chwidth;
417
418  /* copy the default attributes */
419  out->default_attrs = in->default_attrs;
420  out->default_fgcolor = in->default_fgcolor;
421  out->default_bgcolor = in->default_bgcolor;
422
423  last = in->buff->str + in->buff->len - 1;
424  ptr_s = in->buff->str;
425  while (ptr_s <= last) {
426    ptr_e=strchr(ptr_s, '\n');
427    if (!ptr_e) {
428      /* but this shouldn't happen if we end in a \n */
429      break;
430    }
431   
432    if (ptr_e == ptr_s) {
433      owl_fmtext_append_normal(out, "\n");
434      ++ptr_s;
435      continue;
436    }
437
438    col = 0;
439    st = 0;
440    padding = 0;
441    chwidth = 0;
442    ptr_c = ptr_s;
443    while(ptr_c < ptr_e) {
444      gunichar c = g_utf8_get_char(ptr_c);
445      if (!owl_fmtext_is_format_char(c)) {
446        chwidth = mk_wcwidth(c);
447        if (col + chwidth > bcol) break;
448       
449        if (col >= acol) {
450          if (st == 0) {
451            ptr_s = ptr_c;
452            padding = col - acol;
453            ++st;
454          }
455        }
456        col += chwidth;
457        chwidth = 0;
458      }
459      ptr_c = g_utf8_next_char(ptr_c);
460    }
461    if (st) {
462      /* lead padding */
463      owl_fmtext_append_spaces(out, padding);
464      if (ptr_c == ptr_e) {
465        /* We made it to the newline. Append up to, and including it. */
466        _owl_fmtext_append_fmtext(out, in, ptr_s - in->buff->str, ptr_c - in->buff->str + 1);
467      }
468      else if (chwidth > 1) {
469        /* Last char is wide, truncate. */
470        _owl_fmtext_append_fmtext(out, in, ptr_s - in->buff->str, ptr_c - in->buff->str);
471        owl_fmtext_append_normal(out, "\n");
472      }
473      else {
474        /* Last char fits perfectly, We stop at the next char to make
475         * sure we get it all. */
476        ptr_c = g_utf8_next_char(ptr_c);
477        _owl_fmtext_append_fmtext(out, in, ptr_s - in->buff->str, ptr_c - in->buff->str);
478      }
479    }
480    else {
481      owl_fmtext_append_normal(out, "\n");
482    }
483    ptr_s = g_utf8_next_char(ptr_e);
484  }
485}
486
487/* Truncate the message so that each line begins at column 'acol' and
488 * ends at 'bcol' or sooner.  The first column is number 0.  The new
489 * message is placed in 'out'.  The message is expected to end in a
490 * new line for now.
491 *
492 * NOTE: This needs to be modified to deal with backing up if we find
493 * a SPACING COMBINING MARK at the end of a line. If that happens, we
494 * should back up to the last non-mark character and stop there.
495 *
496 * NOTE: If a line ends at bcol, we omit the newline. This is so printing
497 * to ncurses works.
498 */
499void owl_fmtext_truncate_cols(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
500{
501  owl_fmtext notabs;
502
503  /* _owl_fmtext_truncate_cols_internal cannot handle tabs. */
504  if (strchr(in->buff->str, '\t')) {
505    owl_fmtext_init_null(&notabs);
506    owl_fmtext_expand_tabs(in, &notabs, 0);
507    _owl_fmtext_truncate_cols_internal(&notabs, acol, bcol, out);
508    owl_fmtext_cleanup(&notabs);
509  } else {
510    _owl_fmtext_truncate_cols_internal(in, acol, bcol, out);
511  }
512}
513
514/* Return the number of lines in 'f' */
515int owl_fmtext_num_lines(const owl_fmtext *f)
516{
517  int lines, i;
518  char *lastbreak, *p;
519
520  lines=0;
521  lastbreak = f->buff->str;
522  for (i = 0; i < f->buff->len; i++) {
523    if (f->buff->str[i]=='\n') {
524      lastbreak = f->buff->str + i;
525      lines++;
526    }
527  }
528
529  /* Check if there's a trailing line; formatting characters don't count. */
530  for (p = g_utf8_next_char(lastbreak);
531       p < f->buff->str + f->buff->len;
532       p = g_utf8_next_char(p)) {
533    if (!owl_fmtext_is_format_char(g_utf8_get_char(p))) {
534      lines++;
535      break;
536    }
537  }
538
539  return(lines);
540}
541
542/* Returns the line number, starting at 0, of the character which
543 * contains the byte at 'offset'. Note that a trailing newline is part
544 * of the line it ends. Also, while a trailing line of formatting
545 * characters does not contribute to owl_fmtext_num_lines, those
546 * characters are considered on a new line. */
547int owl_fmtext_line_number(const owl_fmtext *f, int offset)
548{
549  int i, lineno = 0;
550  if (offset >= f->buff->len)
551    offset = f->buff->len - 1;
552  for (i = 0; i < offset; i++) {
553    if (f->buff->str[i] == '\n')
554      lineno++;
555  }
556  return lineno;
557}
558
559/* Searches for line 'lineno' in 'f'. The returned range, [start,
560 * end), forms a half-open interval for the extent of the line. */
561void owl_fmtext_line_extents(const owl_fmtext *f, int lineno, int *o_start, int *o_end)
562{
563  int start, end;
564  char *newline;
565  for (start = 0; lineno > 0 && start < f->buff->len; start++) {
566    if (f->buff->str[start] == '\n')
567      lineno--;
568  }
569  newline = strchr(f->buff->str + start, '\n');
570  /* Include the newline, if it is there. */
571  end = newline ? newline - f->buff->str + 1 : f->buff->len;
572  if (o_start) *o_start = start;
573  if (o_end) *o_end = end;
574}
575
576const char *owl_fmtext_get_text(const owl_fmtext *f)
577{
578  return f->buff->str;
579}
580
581int owl_fmtext_num_bytes(const owl_fmtext *f)
582{
583  return f->buff->len;
584}
585
586/* set the charater at 'index' to be 'char'.  If index is out of
587 * bounds don't do anything. If c or char at index is not ASCII, don't
588 * do anything because it's not UTF-8 safe. */
589void owl_fmtext_set_char(owl_fmtext *f, int index, char ch)
590{
591  if ((index < 0) || (index > f->buff->len - 1)) return;
592  /* NOT ASCII*/
593  if (f->buff->str[index] & 0x80 || ch & 0x80) return;
594  f->buff->str[index] = ch;
595}
596
597/* Make a copy of the fmtext 'src' into 'dst' */
598void owl_fmtext_copy(owl_fmtext *dst, const owl_fmtext *src)
599{
600  dst->buff = g_string_new(src->buff->str);
601  dst->default_attrs = src->default_attrs;
602  dst->default_fgcolor = src->default_fgcolor;
603  dst->default_bgcolor = src->default_bgcolor;
604}
605
606/* Search 'f' for the regex 're' for matches starting at
607 * 'start'. Returns the offset of the first match, -1 if not
608 * found. This is a case-insensitive search.
609 */
610int owl_fmtext_search(const owl_fmtext *f, const owl_regex *re, int start)
611{
612  int offset;
613  if (start > f->buff->len ||
614      owl_regex_compare(re, f->buff->str + start, &offset, NULL) != 0)
615    return -1;
616  return offset + start;
617}
618
619
620/* Append the text 'text' to 'f' and interpret the zephyr style
621 * formatting syntax to set appropriate attributes.
622 */
623void owl_fmtext_append_ztext(owl_fmtext *f, const char *text)
624{
625  int stacksize, curattrs, curcolor;
626  const char *ptr, *txtptr, *tmpptr;
627  char *buff;
628  int attrstack[32], chrstack[32], colorstack[32];
629
630  curattrs=OWL_FMTEXT_ATTR_NONE;
631  curcolor=OWL_COLOR_DEFAULT;
632  stacksize=0;
633  txtptr=text;
634  while (1) {
635    ptr=strpbrk(txtptr, "@{[<()>]}");
636    if (!ptr) {
637      /* add all the rest of the text and exit */
638      owl_fmtext_append_attr(f, txtptr, curattrs, curcolor, OWL_COLOR_DEFAULT);
639      return;
640    } else if (ptr[0]=='@') {
641      /* add the text up to this point then deal with the stack */
642      buff=owl_malloc(ptr-txtptr+20);
643      strncpy(buff, txtptr, ptr-txtptr);
644      buff[ptr-txtptr]='\0';
645      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
646      owl_free(buff);
647
648      /* update pointer to point at the @ */
649      txtptr=ptr;
650
651      /* now the stack */
652
653      /* if we've hit our max stack depth, print the @ and move on */
654      if (stacksize==32) {
655        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
656        txtptr++;
657        continue;
658      }
659
660      /* if it's an @@, print an @ and continue */
661      if (txtptr[1]=='@') {
662        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
663        txtptr+=2;
664        continue;
665      }
666       
667      /* if there's no opener, print the @ and continue */
668      tmpptr=strpbrk(txtptr, "(<[{ ");
669      if (!tmpptr || tmpptr[0]==' ') {
670        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
671        txtptr++;
672        continue;
673      }
674
675      /* check what command we've got, push it on the stack, start
676         using it, and continue ... unless it's a color command */
677      buff=owl_malloc(tmpptr-ptr+20);
678      strncpy(buff, ptr, tmpptr-ptr);
679      buff[tmpptr-ptr]='\0';
680      if (!strcasecmp(buff, "@bold")) {
681        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
682        chrstack[stacksize]=tmpptr[0];
683        colorstack[stacksize]=curcolor;
684        stacksize++;
685        curattrs|=OWL_FMTEXT_ATTR_BOLD;
686        txtptr+=6;
687        owl_free(buff);
688        continue;
689      } else if (!strcasecmp(buff, "@b")) {
690        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
691        chrstack[stacksize]=tmpptr[0];
692        colorstack[stacksize]=curcolor;
693        stacksize++;
694        curattrs|=OWL_FMTEXT_ATTR_BOLD;
695        txtptr+=3;
696        owl_free(buff);
697        continue;
698      } else if (!strcasecmp(buff, "@i")) {
699        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
700        chrstack[stacksize]=tmpptr[0];
701        colorstack[stacksize]=curcolor;
702        stacksize++;
703        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
704        txtptr+=3;
705        owl_free(buff);
706        continue;
707      } else if (!strcasecmp(buff, "@italic")) {
708        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
709        chrstack[stacksize]=tmpptr[0];
710        colorstack[stacksize]=curcolor;
711        stacksize++;
712        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
713        txtptr+=8;
714        owl_free(buff);
715        continue;
716      } else if (!strcasecmp(buff, "@")) {
717        attrstack[stacksize]=OWL_FMTEXT_ATTR_NONE;
718        chrstack[stacksize]=tmpptr[0];
719        colorstack[stacksize]=curcolor;
720        stacksize++;
721        txtptr+=2;
722        owl_free(buff);
723        continue;
724
725        /* if it's a color read the color, set the current color and
726           continue */
727      } else if (!strcasecmp(buff, "@color") 
728                 && owl_global_get_hascolors(&g)
729                 && owl_global_is_colorztext(&g)) {
730        owl_free(buff);
731        txtptr+=7;
732        tmpptr=strpbrk(txtptr, "@{[<()>]}");
733        if (tmpptr &&
734            ((txtptr[-1]=='(' && tmpptr[0]==')') ||
735             (txtptr[-1]=='<' && tmpptr[0]=='>') ||
736             (txtptr[-1]=='[' && tmpptr[0]==']') ||
737             (txtptr[-1]=='{' && tmpptr[0]=='}'))) {
738
739          /* grab the color name */
740          buff=owl_malloc(tmpptr-txtptr+20);
741          strncpy(buff, txtptr, tmpptr-txtptr);
742          buff[tmpptr-txtptr]='\0';
743
744          /* set it as the current color */
745          curcolor=owl_util_string_to_color(buff);
746          if (curcolor == OWL_COLOR_INVALID)
747              curcolor = OWL_COLOR_DEFAULT;
748          owl_free(buff);
749          txtptr=tmpptr+1;
750          continue;
751
752        } else {
753
754        }
755
756      } else {
757        /* if we didn't understand it, we'll print it.  This is different from zwgc
758         * but zwgc seems to be smarter about some screw cases than I am
759         */
760        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
761        txtptr++;
762        continue;
763      }
764
765    } else if (ptr[0]=='}' || ptr[0]==']' || ptr[0]==')' || ptr[0]=='>') {
766      /* add the text up to this point first */
767      buff=owl_malloc(ptr-txtptr+20);
768      strncpy(buff, txtptr, ptr-txtptr);
769      buff[ptr-txtptr]='\0';
770      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
771      owl_free(buff);
772
773      /* now deal with the closer */
774      txtptr=ptr;
775
776      /* first, if the stack is empty we must bail (just print and go) */
777      if (stacksize==0) {
778        buff=owl_malloc(5);
779        buff[0]=ptr[0];
780        buff[1]='\0';
781        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
782        owl_free(buff);
783        txtptr++;
784        continue;
785      }
786
787      /* if the closing char is what's on the stack, turn off the
788         attribue and pop the stack */
789      if ((ptr[0]==')' && chrstack[stacksize-1]=='(') ||
790          (ptr[0]=='>' && chrstack[stacksize-1]=='<') ||
791          (ptr[0]==']' && chrstack[stacksize-1]=='[') ||
792          (ptr[0]=='}' && chrstack[stacksize-1]=='{')) {
793        int i;
794        stacksize--;
795        curattrs=OWL_FMTEXT_ATTR_NONE;
796        curcolor = colorstack[stacksize];
797        for (i=0; i<stacksize; i++) {
798          curattrs|=attrstack[i];
799        }
800        txtptr+=1;
801        continue;
802      } else {
803        /* otherwise print and continue */
804        buff=owl_malloc(5);
805        buff[0]=ptr[0];
806        buff[1]='\0';
807        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
808        owl_free(buff);
809        txtptr++;
810        continue;
811      }
812    } else {
813      /* we've found an unattached opener, print everything and move on */
814      buff=owl_malloc(ptr-txtptr+20);
815      strncpy(buff, txtptr, ptr-txtptr+1);
816      buff[ptr-txtptr+1]='\0';
817      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
818      owl_free(buff);
819      txtptr=ptr+1;
820      continue;
821    }
822  }
823}
824
825/* requires that the list values are strings or NULL.
826 * joins the elements together with join_with.
827 * If format_fn is specified, passes it the list element value
828 * and it will return a string which this needs to free. */
829void owl_fmtext_append_list(owl_fmtext *f, const owl_list *l, const char *join_with, char *(format_fn)(const char *))
830{
831  int i, size;
832  const char *elem;
833  char *text;
834
835  size = owl_list_get_size(l);
836  for (i=0; i<size; i++) {
837    elem = owl_list_get_element(l,i);
838    if (elem && format_fn) {
839      text = format_fn(elem);
840      if (text) {
841        owl_fmtext_append_normal(f, text);
842        owl_free(text);
843      }
844    } else if (elem) {
845      owl_fmtext_append_normal(f, elem);
846    }
847    if ((i < size-1) && join_with) {
848      owl_fmtext_append_normal(f, join_with);
849    }
850  }
851}
852
853/* Free all memory allocated by the object */
854void owl_fmtext_cleanup(owl_fmtext *f)
855{
856  if (f->buff) g_string_free(f->buff, true);
857  f->buff = NULL;
858}
859
860/*** Color Pair manager ***/
861void owl_fmtext_init_colorpair_mgr(owl_colorpair_mgr *cpmgr)
862{
863  /* This could be a bitarray if we wanted to save memory. */
864  short i, j;
865  cpmgr->next = 8;
866 
867  /* The test is <= because we allocate COLORS+1 entries. */
868  cpmgr->pairs = owl_malloc((COLORS+1) * sizeof(short*));
869  for(i = 0; i <= COLORS; i++) {
870    cpmgr->pairs[i] = owl_malloc((COLORS+1) * sizeof(short));
871    for(j = 0; j <= COLORS; j++) {
872      cpmgr->pairs[i][j] = -1;
873    }
874  }
875  if (owl_global_get_hascolors(&g)) {
876    for(i = 0; i < 8; i++) {
877      short fg, bg;
878      if (i >= COLORS) continue;
879      pair_content(i, &fg, &bg);
880      cpmgr->pairs[fg+1][bg+1] = i;
881    }
882  }
883}
884
885/* Reset used list */
886void owl_fmtext_reset_colorpairs(void)
887{
888  if (owl_global_get_hascolors(&g)) {
889    short i, j;
890    owl_colorpair_mgr *cpmgr = owl_global_get_colorpair_mgr(&g);
891    cpmgr->next = 8;
892   
893    /* The test is <= because we allocated COLORS+1 entries. */
894    for(i = 0; i <= COLORS; i++) {
895      for(j = 0; j <= COLORS; j++) {
896        cpmgr->pairs[i][j] = -1;
897      }
898    }
899    for(i = 0; i < 8; i++) {
900      short fg, bg;
901      if (i >= COLORS) continue;
902      pair_content(i, &fg, &bg);
903      cpmgr->pairs[fg+1][bg+1] = i;
904    }
905  }
906}
907
908/* Assign pairs by request */
909short owl_fmtext_get_colorpair(int fg, int bg)
910{
911  owl_colorpair_mgr *cpmgr;
912  short pair;
913
914  /* Sanity (Bounds) Check */
915  if (fg > COLORS || fg < OWL_COLOR_DEFAULT) fg = OWL_COLOR_DEFAULT;
916  if (bg > COLORS || bg < OWL_COLOR_DEFAULT) bg = OWL_COLOR_DEFAULT;
917           
918#ifdef HAVE_USE_DEFAULT_COLORS
919  if (fg == OWL_COLOR_DEFAULT) fg = -1;
920#else
921  if (fg == OWL_COLOR_DEFAULT) fg = 0;
922  if (bg == OWL_COLOR_DEFAULT) bg = 0;
923#endif
924
925  /* looking for a pair we already set up for this draw. */
926  cpmgr = owl_global_get_colorpair_mgr(&g);
927  pair = cpmgr->pairs[fg+1][bg+1];
928  if (!(pair != -1 && pair < cpmgr->next)) {
929    /* If we didn't find a pair, search for a free one to assign. */
930    pair = (cpmgr->next < COLOR_PAIRS) ? cpmgr->next : -1;
931    if (pair != -1) {
932      /* We found a free pair, initialize it. */
933      init_pair(pair, fg, bg);
934      cpmgr->pairs[fg+1][bg+1] = pair;
935      cpmgr->next++;
936    }
937    else if (bg != OWL_COLOR_DEFAULT) {
938      /* We still don't have a pair, drop the background color. Too bad. */
939      owl_function_debugmsg("colorpairs: color shortage - dropping background color.");
940      pair = owl_fmtext_get_colorpair(fg, OWL_COLOR_DEFAULT);
941    }
942    else {
943      /* We still don't have a pair, defaults all around. */
944      owl_function_debugmsg("colorpairs: color shortage - dropping foreground and background color.");
945      pair = 0;
946    }
947  }
948  return pair;
949}
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