source: fmtext.c @ 4cf7b1b

release-1.7release-1.8release-1.9
Last change on this file since 4cf7b1b was f7456bc, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Add owl_fmtext_line_number and test.
  • Property mode set to 100644
File size: 28.5 KB
Line 
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->textlen = 0;
9  f->bufflen = 5;
10  f->textbuff = owl_malloc(5);
11  f->textbuff[0] = 0;
12  f->default_attrs = OWL_FMTEXT_ATTR_NONE;
13  f->default_fgcolor = OWL_COLOR_DEFAULT;
14  f->default_bgcolor = OWL_COLOR_DEFAULT;
15}
16
17/* Clear the data from an fmtext, but don't deallocate memory. This
18   fmtext can then be appended to again. */
19void owl_fmtext_clear(owl_fmtext *f)
20{
21  f->textlen = 0;
22  f->textbuff[0] = 0;
23  f->default_attrs = OWL_FMTEXT_ATTR_NONE;
24  f->default_fgcolor = OWL_COLOR_DEFAULT;
25  f->default_bgcolor = OWL_COLOR_DEFAULT;
26}
27
28static void _owl_fmtext_realloc(owl_fmtext *f, int newlen)
29{
30    if(newlen + 1 > f->bufflen) {
31      f->textbuff = owl_realloc(f->textbuff, newlen + 1);
32      f->bufflen = newlen+1;
33  }
34}
35
36int owl_fmtext_is_format_char(gunichar c)
37{
38  if ((c & ~OWL_FMTEXT_UC_ATTR_MASK) == OWL_FMTEXT_UC_ATTR) return 1;
39  if ((c & ~(OWL_FMTEXT_UC_ALLCOLOR_MASK)) == OWL_FMTEXT_UC_COLOR_BASE) return 1;
40  return 0;
41}
42/* append text to the end of 'f' with attribute 'attr' and color
43 * 'color'
44 */
45void owl_fmtext_append_attr(owl_fmtext *f, const char *text, char attr, short fgcolor, short bgcolor)
46{
47  char attrbuff[6];
48  int newlen, a = 0, fg = 0, bg = 0;
49 
50  if (attr != OWL_FMTEXT_ATTR_NONE) a=1;
51  if (fgcolor != OWL_COLOR_DEFAULT) fg=1;
52  if (bgcolor != OWL_COLOR_DEFAULT) bg=1;
53
54  /* Plane-16 characters in UTF-8 are 4 bytes long. */
55  newlen = strlen(f->textbuff) + strlen(text) + (8 * (a + fg + bg));
56  _owl_fmtext_realloc(f, newlen);
57
58  /* Set attributes */
59  if (a)
60    strncat(f->textbuff, attrbuff,
61            g_unichar_to_utf8(OWL_FMTEXT_UC_ATTR | attr, attrbuff));
62  if (fg)
63    strncat(f->textbuff, attrbuff,
64            g_unichar_to_utf8(OWL_FMTEXT_UC_FGCOLOR | fgcolor, attrbuff));
65  if (bg)
66    strncat(f->textbuff, attrbuff,
67            g_unichar_to_utf8(OWL_FMTEXT_UC_BGCOLOR | bgcolor, attrbuff));
68 
69  strcat(f->textbuff, text);
70
71  /* Reset attributes */
72  if (bg) strcat(f->textbuff, OWL_FMTEXT_UTF8_BGDEFAULT);
73  if (fg) strcat(f->textbuff, OWL_FMTEXT_UTF8_FGDEFAULT);
74  if (a)  strcat(f->textbuff, OWL_FMTEXT_UTF8_ATTR_NONE);
75  f->textlen=newlen;
76}
77
78/* Append normal, uncolored text 'text' to 'f' */
79void owl_fmtext_append_normal(owl_fmtext *f, const char *text)
80{
81  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
82}
83
84/* Append normal, uncolored text specified by format string to 'f' */
85void owl_fmtext_appendf_normal(owl_fmtext *f, const char *fmt, ...)
86{
87  va_list ap;
88  char *buff;
89
90  va_start(ap, fmt);
91  buff = g_strdup_vprintf(fmt, ap);
92  va_end(ap);
93  if (!buff)
94    return;
95  owl_fmtext_append_attr(f, buff, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
96  owl_free(buff);
97}
98
99/* Append normal text 'text' to 'f' with color 'color' */
100void owl_fmtext_append_normal_color(owl_fmtext *f, const char *text, int fgcolor, int bgcolor)
101{
102  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, fgcolor, bgcolor);
103}
104
105/* Append bold text 'text' to 'f' */
106void owl_fmtext_append_bold(owl_fmtext *f, const char *text)
107{
108  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
109}
110
111/* Append reverse video text 'text' to 'f' */
112void owl_fmtext_append_reverse(owl_fmtext *f, const char *text)
113{
114  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
115}
116
117/* Append reversed and bold, uncolored text 'text' to 'f' */
118void owl_fmtext_append_reversebold(owl_fmtext *f, const char *text)
119{
120  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE | OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
121}
122
123/* Add the attribute 'attr' to the default atts for the text in 'f' */
124void owl_fmtext_addattr(owl_fmtext *f, char attr)
125{
126  /* add the attribute to all text */
127  f->default_attrs |= attr;
128}
129
130/* Set the default foreground color for this fmtext to 'color'.
131 * Only affects text that is colored default.
132 */
133void owl_fmtext_colorize(owl_fmtext *f, int color)
134{
135  f->default_fgcolor = color;
136}
137
138/* Set the default foreground color for this fmtext to 'color'.
139 * Only affects text that is colored default.
140 */
141void owl_fmtext_colorizebg(owl_fmtext *f, int color)
142{
143  f->default_bgcolor = color;
144}
145
146/* Internal function. Parse attrbute character. */
147static void _owl_fmtext_update_attributes(gunichar c, char *attr, short *fgcolor, short *bgcolor)
148{
149  if ((c & OWL_FMTEXT_UC_ATTR) == OWL_FMTEXT_UC_ATTR) {
150    *attr = c & OWL_FMTEXT_UC_ATTR_MASK;
151  }
152  else if ((c & OWL_FMTEXT_UC_COLOR_BASE) == OWL_FMTEXT_UC_COLOR_BASE) {
153    if ((c & OWL_FMTEXT_UC_BGCOLOR) == OWL_FMTEXT_UC_BGCOLOR) {
154      *bgcolor = (c == OWL_FMTEXT_UC_BGDEFAULT
155                  ? OWL_COLOR_DEFAULT
156                  : c & OWL_FMTEXT_UC_COLOR_MASK);
157    }
158    else if ((c & OWL_FMTEXT_UC_FGCOLOR) == OWL_FMTEXT_UC_FGCOLOR) {
159      *fgcolor = (c == OWL_FMTEXT_UC_FGDEFAULT
160                  ? OWL_COLOR_DEFAULT
161                  : c & OWL_FMTEXT_UC_COLOR_MASK);
162    }
163  }
164}
165
166/* Internal function. Scan for attribute characters. */
167static void _owl_fmtext_scan_attributes(const owl_fmtext *f, int start, char *attr, short *fgcolor, short *bgcolor)
168{
169  const char *p;
170  p = strchr(f->textbuff, OWL_FMTEXT_UC_STARTBYTE_UTF8);
171  while (p && p < f->textbuff + start) {
172    _owl_fmtext_update_attributes(g_utf8_get_char(p), attr, fgcolor, bgcolor);
173    p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
174  }
175} 
176
177/* Internal function.  Append text from 'in' between index 'start'
178 * inclusive and 'stop' exclusive, to the end of 'f'. This function
179 * works with bytes.
180 */
181static void _owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in, int start, int stop)
182{
183  char attrbuff[6];
184  int newlen, a = 0, fg = 0, bg = 0;
185  char attr = 0;
186  short fgcolor = OWL_COLOR_DEFAULT;
187  short bgcolor = OWL_COLOR_DEFAULT;
188
189  _owl_fmtext_scan_attributes(in, start, &attr, &fgcolor, &bgcolor);
190  if (attr != OWL_FMTEXT_ATTR_NONE) a=1;
191  if (fgcolor != OWL_COLOR_DEFAULT) fg=1;
192  if (bgcolor != OWL_COLOR_DEFAULT) bg=1;
193
194  /* We will reset to defaults after appending the text. We may need
195     to set initial attributes. */
196  newlen=strlen(f->textbuff)+(stop-start) + (4 * (a + fg + bg)) + 12;
197  _owl_fmtext_realloc(f, newlen);
198
199  if (a)
200    strncat(f->textbuff, attrbuff,
201            g_unichar_to_utf8(OWL_FMTEXT_UC_ATTR | attr, attrbuff));
202  if (fg)
203    strncat(f->textbuff, attrbuff,
204            g_unichar_to_utf8(OWL_FMTEXT_UC_FGCOLOR | fgcolor, attrbuff));
205  if (bg)
206    strncat(f->textbuff, attrbuff,
207            g_unichar_to_utf8(OWL_FMTEXT_UC_BGCOLOR | bgcolor, attrbuff));
208
209  strncat(f->textbuff, in->textbuff+start, stop-start);
210
211  /* Reset attributes */
212  strcat(f->textbuff, OWL_FMTEXT_UTF8_BGDEFAULT);
213  strcat(f->textbuff, OWL_FMTEXT_UTF8_FGDEFAULT);
214  strcat(f->textbuff, OWL_FMTEXT_UTF8_ATTR_NONE);
215
216  f->textbuff[newlen]='\0';
217  f->textlen=newlen;
218}
219
220/* append fmtext 'in' to 'f' */
221void owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in)
222{
223  _owl_fmtext_append_fmtext(f, in, 0, in->textlen);
224
225}
226
227/* Append 'nspaces' number of spaces to the end of 'f' */
228void owl_fmtext_append_spaces(owl_fmtext *f, int nspaces)
229{
230  int i;
231  for (i=0; i<nspaces; i++) {
232    owl_fmtext_append_normal(f, " ");
233  }
234}
235
236/* Return a plain version of the fmtext.  Caller is responsible for
237 * freeing the return
238 */
239char *owl_fmtext_print_plain(const owl_fmtext *f)
240{
241  return owl_strip_format_chars(f->textbuff);
242}
243
244static void _owl_fmtext_wattrset(WINDOW *w, int attrs)
245{
246  wattrset(w, A_NORMAL);
247  if (attrs & OWL_FMTEXT_ATTR_BOLD) wattron(w, A_BOLD);
248  if (attrs & OWL_FMTEXT_ATTR_REVERSE) wattron(w, A_REVERSE);
249  if (attrs & OWL_FMTEXT_ATTR_UNDERLINE) wattron(w, A_UNDERLINE);
250}
251
252static void _owl_fmtext_update_colorpair(short fg, short bg, short *pair)
253{
254  if (owl_global_get_hascolors(&g)) {
255    *pair = owl_fmtext_get_colorpair(fg, bg);
256  }
257}
258
259static void _owl_fmtext_wcolor_set(WINDOW *w, short pair)
260{
261  if (owl_global_get_hascolors(&g)) {
262      wcolor_set(w,pair,NULL);
263      wbkgdset(w, COLOR_PAIR(pair));
264  }
265}
266
267/* add the formatted text to the curses window 'w'.  The window 'w'
268 * must already be initiatlized with curses
269 */
270static void _owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w, int do_search)
271{
272  /* char *tmpbuff; */
273  /* int position, trans1, trans2, trans3, len, lastsame; */
274  char *s, *p;
275  char attr;
276  short fg, bg, pair = 0;
277 
278  if (w==NULL) {
279    owl_function_debugmsg("Hit a null window in owl_fmtext_curs_waddstr.");
280    return;
281  }
282
283  s = f->textbuff;
284  /* Set default attributes. */
285  attr = f->default_attrs;
286  fg = f->default_fgcolor;
287  bg = f->default_bgcolor;
288  _owl_fmtext_wattrset(w, attr);
289  _owl_fmtext_update_colorpair(fg, bg, &pair);
290  _owl_fmtext_wcolor_set(w, pair);
291
292  /* Find next possible format character. */
293  p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
294  while(p) {
295    if (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
296      /* Deal with all text from last insert to here. */
297      char tmp;
298   
299      tmp = p[0];
300      p[0] = '\0';
301      if (do_search && owl_global_is_search_active(&g)) {
302        /* Search is active, so highlight search results. */
303        char tmp2;
304        int start, end;
305        while (owl_regex_compare(owl_global_get_search_re(&g), s, &start, &end) == 0) {
306          /* Prevent an infinite loop matching the empty string. */
307          if (end == 0)
308            break;
309
310          /* Found search string, highlight it. */
311
312          tmp2 = s[start];
313          s[start] = '\0';
314          waddstr(w, s);
315          s[start] = tmp2;
316
317          _owl_fmtext_wattrset(w, attr ^ OWL_FMTEXT_ATTR_REVERSE);
318          _owl_fmtext_wcolor_set(w, pair);
319         
320          tmp2 = s[end];
321          s[end] = '\0';
322          waddstr(w, s + start);
323          s[end] = tmp2;
324
325          _owl_fmtext_wattrset(w, attr);
326          _owl_fmtext_wcolor_set(w, pair);
327
328          s += end;
329        }
330      }
331      /* Deal with remaining part of string. */
332      waddstr(w, s);
333      p[0] = tmp;
334
335      /* Deal with new attributes. Initialize to defaults, then
336         process all consecutive formatting characters. */
337      attr = f->default_attrs;
338      fg = f->default_fgcolor;
339      bg = f->default_bgcolor;
340      while (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
341        _owl_fmtext_update_attributes(g_utf8_get_char(p), &attr, &fg, &bg);
342        p = g_utf8_next_char(p);
343      }
344      _owl_fmtext_wattrset(w, attr | f->default_attrs);
345      if (fg == OWL_COLOR_DEFAULT) fg = f->default_fgcolor;
346      if (bg == OWL_COLOR_DEFAULT) bg = f->default_bgcolor;
347      _owl_fmtext_update_colorpair(fg, bg, &pair);
348      _owl_fmtext_wcolor_set(w, pair);
349
350      /* Advance to next non-formatting character. */
351      s = p;
352      p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
353    }
354    else {
355      p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
356    }
357  }
358  if (s) {
359    waddstr(w, s);
360  }
361  wbkgdset(w, 0);
362}
363
364void owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w)
365{
366  _owl_fmtext_curs_waddstr(f, w, 1);
367}
368
369void owl_fmtext_curs_waddstr_without_search(const owl_fmtext *f, WINDOW *w)
370{
371  _owl_fmtext_curs_waddstr(f, w, 0);
372}
373
374/* Expands tabs. Tabs are expanded as if given an initial indent of start. */
375void owl_fmtext_expand_tabs(const owl_fmtext *in, owl_fmtext *out, int start) {
376  int col = start, numcopied = 0;
377  char *ptr;
378
379  /* Copy the default attributes. */
380  out->default_attrs = in->default_attrs;
381  out->default_fgcolor = in->default_fgcolor;
382  out->default_bgcolor = in->default_bgcolor;
383
384  for (ptr = in->textbuff;
385       ptr < in->textbuff + in->textlen;
386       ptr = g_utf8_next_char(ptr)) {
387    gunichar c = g_utf8_get_char(ptr);
388    int chwidth;
389    if (c == '\t') {
390      /* Copy up to this tab */
391      _owl_fmtext_append_fmtext(out, in, numcopied, ptr - in->textbuff);
392      /* and then copy spaces for the tab. */
393      chwidth = OWL_TAB_WIDTH - (col % OWL_TAB_WIDTH);
394      owl_fmtext_append_spaces(out, chwidth);
395      col += chwidth;
396      numcopied = g_utf8_next_char(ptr) - in->textbuff;
397    } else {
398      /* Just update col. We'll append later. */
399      if (c == '\n') {
400        col = start;
401      } else if (!owl_fmtext_is_format_char(c)) {
402        col += mk_wcwidth(c);
403      }
404    }
405  }
406  /* Append anything we've missed. */
407  if (numcopied < in->textlen)
408    _owl_fmtext_append_fmtext(out, in, numcopied, in->textlen);
409}
410
411/* start with line 'aline' (where the first line is 0) and print
412 * 'lines' number of lines into 'out'
413 */
414int owl_fmtext_truncate_lines(const owl_fmtext *in, int aline, int lines, owl_fmtext *out)
415{
416  const char *ptr1, *ptr2;
417  int i, offset;
418 
419  /* find the starting line */
420  ptr1 = in->textbuff;
421  for (i = 0; i < aline; i++) {
422    ptr1 = strchr(ptr1, '\n');
423    if (!ptr1) return(-1);
424    ptr1++;
425  }
426 
427  /* ptr1 now holds the starting point */
428
429  /* copy the default attributes */
430  out->default_attrs = in->default_attrs;
431  out->default_fgcolor = in->default_fgcolor;
432  out->default_bgcolor = in->default_bgcolor;
433   
434  /* copy in the next 'lines' lines */
435  if (lines < 1) return(-1);
436
437  for (i = 0; i < lines; i++) {
438    offset = ptr1 - in->textbuff;
439    ptr2 = strchr(ptr1, '\n');
440    if (!ptr2) {
441      /* Copy to the end of the buffer. */
442      _owl_fmtext_append_fmtext(out, in, offset, in->textlen);
443      return(-1);
444    }
445    /* Copy up to, and including, the new line. */
446    _owl_fmtext_append_fmtext(out, in, offset, (ptr2 - ptr1) + offset + 1);
447    ptr1 = ptr2 + 1;
448  }
449  return(0);
450}
451
452/* Implementation of owl_fmtext_truncate_cols. Does not support tabs in input. */
453void _owl_fmtext_truncate_cols_internal(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
454{
455  const char *ptr_s, *ptr_e, *ptr_c, *last;
456  int col, st, padding, chwidth;
457
458  /* copy the default attributes */
459  out->default_attrs = in->default_attrs;
460  out->default_fgcolor = in->default_fgcolor;
461  out->default_bgcolor = in->default_bgcolor;
462
463  last=in->textbuff+in->textlen-1;
464  ptr_s=in->textbuff;
465  while (ptr_s <= last) {
466    ptr_e=strchr(ptr_s, '\n');
467    if (!ptr_e) {
468      /* but this shouldn't happen if we end in a \n */
469      break;
470    }
471   
472    if (ptr_e == ptr_s) {
473      owl_fmtext_append_normal(out, "\n");
474      ++ptr_s;
475      continue;
476    }
477
478    col = 0;
479    st = 0;
480    padding = 0;
481    chwidth = 0;
482    ptr_c = ptr_s;
483    while(ptr_c < ptr_e) {
484      gunichar c = g_utf8_get_char(ptr_c);
485      if (!owl_fmtext_is_format_char(c)) {
486        chwidth = mk_wcwidth(c);
487        if (col + chwidth > bcol) break;
488       
489        if (col >= acol) {
490          if (st == 0) {
491            ptr_s = ptr_c;
492            padding = col - acol;
493            ++st;
494          }
495        }
496        col += chwidth;
497        chwidth = 0;
498      }
499      ptr_c = g_utf8_next_char(ptr_c);
500    }
501    if (st) {
502      /* lead padding */
503      owl_fmtext_append_spaces(out, padding);
504      if (ptr_c == ptr_e) {
505        /* We made it to the newline. Append up to, and including it. */
506        _owl_fmtext_append_fmtext(out, in, ptr_s - in->textbuff, ptr_c - in->textbuff + 1);
507      }
508      else if (chwidth > 1) {
509        /* Last char is wide, truncate. */
510        _owl_fmtext_append_fmtext(out, in, ptr_s - in->textbuff, ptr_c - in->textbuff);
511        owl_fmtext_append_normal(out, "\n");
512      }
513      else {
514        /* Last char fits perfectly, We stop at the next char to make
515         * sure we get it all. */
516        ptr_c = g_utf8_next_char(ptr_c);
517        _owl_fmtext_append_fmtext(out, in, ptr_s - in->textbuff, ptr_c - in->textbuff);
518      }
519    }
520    else {
521      owl_fmtext_append_normal(out, "\n");
522    }
523    ptr_s = g_utf8_next_char(ptr_e);
524  }
525}
526
527/* Truncate the message so that each line begins at column 'acol' and
528 * ends at 'bcol' or sooner.  The first column is number 0.  The new
529 * message is placed in 'out'.  The message is expected to end in a
530 * new line for now.
531 *
532 * NOTE: This needs to be modified to deal with backing up if we find
533 * a SPACING COMBINING MARK at the end of a line. If that happens, we
534 * should back up to the last non-mark character and stop there.
535 *
536 * NOTE: If a line ends at bcol, we omit the newline. This is so printing
537 * to ncurses works.
538 */
539void owl_fmtext_truncate_cols(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
540{
541  owl_fmtext notabs;
542
543  /* _owl_fmtext_truncate_cols_internal cannot handle tabs. */
544  if (strchr(in->textbuff, '\t')) {
545    owl_fmtext_init_null(&notabs);
546    owl_fmtext_expand_tabs(in, &notabs, 0);
547    _owl_fmtext_truncate_cols_internal(&notabs, acol, bcol, out);
548    owl_fmtext_cleanup(&notabs);
549  } else {
550    _owl_fmtext_truncate_cols_internal(in, acol, bcol, out);
551  }
552}
553
554/* Return the number of lines in 'f' */
555int owl_fmtext_num_lines(const owl_fmtext *f)
556{
557  int lines, i;
558  char *lastbreak, *p;
559
560  lines=0;
561  lastbreak = f->textbuff;
562  for (i=0; i<f->textlen; i++) {
563    if (f->textbuff[i]=='\n') {
564      lastbreak = f->textbuff + i;
565      lines++;
566    }
567  }
568
569  /* Check if there's a trailing line; formatting characters don't count. */
570  for (p = g_utf8_next_char(lastbreak);
571       p < f->textbuff + f->textlen;
572       p = g_utf8_next_char(p)) {
573    if (!owl_fmtext_is_format_char(g_utf8_get_char(p))) {
574      lines++;
575      break;
576    }
577  }
578
579  return(lines);
580}
581
582/* Returns the line number, starting at 0, of the character which
583 * contains the byte at 'offset'. Note that a trailing newline is part
584 * of the line it ends. Also, while a trailing line of formatting
585 * characters does not contribute to owl_fmtext_num_lines, those
586 * characters are considered on a new line. */
587int owl_fmtext_line_number(const owl_fmtext *f, int offset)
588{
589  int i, lineno = 0;
590  if (offset >= f->textlen)
591    offset = f->textlen - 1;
592  for (i = 0; i < offset; i++) {
593    if (f->textbuff[i] == '\n')
594      lineno++;
595  }
596  return lineno;
597}
598
599const char *owl_fmtext_get_text(const owl_fmtext *f)
600{
601  return(f->textbuff);
602}
603
604int owl_fmtext_num_bytes(const owl_fmtext *f)
605{
606  return(f->textlen);
607}
608
609/* set the charater at 'index' to be 'char'.  If index is out of
610 * bounds don't do anything. If c or char at index is not ASCII, don't
611 * do anything because it's not UTF-8 safe. */
612void owl_fmtext_set_char(owl_fmtext *f, int index, char ch)
613{
614  if ((index < 0) || (index > f->textlen-1)) return;
615  /* NOT ASCII*/
616  if (f->textbuff[index] & 0x80 || ch & 0x80) return; 
617  f->textbuff[index]=ch;
618}
619
620/* Make a copy of the fmtext 'src' into 'dst' */
621void owl_fmtext_copy(owl_fmtext *dst, const owl_fmtext *src)
622{
623  int mallocsize;
624
625  if (src->textlen==0) {
626    mallocsize=5;
627  } else {
628    mallocsize=src->textlen+2;
629  }
630  dst->textlen=src->textlen;
631  dst->bufflen=mallocsize;
632  dst->textbuff=owl_malloc(mallocsize);
633  memcpy(dst->textbuff, src->textbuff, src->textlen+1);
634  dst->default_attrs = src->default_attrs;
635  dst->default_fgcolor = src->default_fgcolor;
636  dst->default_bgcolor = src->default_bgcolor;
637}
638
639/* Search 'f' for the regex 're' for matches starting at
640 * 'start'. Returns the offset of the first match, -1 if not
641 * found. This is a case-insensitive search.
642 */
643int owl_fmtext_search(const owl_fmtext *f, const owl_regex *re, int start)
644{
645  int offset;
646  if (start > f->textlen ||
647      owl_regex_compare(re, f->textbuff + start, &offset, NULL) != 0)
648    return -1;
649  return offset + start;
650}
651
652
653/* Append the text 'text' to 'f' and interpret the zephyr style
654 * formatting syntax to set appropriate attributes.
655 */
656void owl_fmtext_append_ztext(owl_fmtext *f, const char *text)
657{
658  int stacksize, curattrs, curcolor;
659  const char *ptr, *txtptr, *tmpptr;
660  char *buff;
661  int attrstack[32], chrstack[32], colorstack[32];
662
663  curattrs=OWL_FMTEXT_ATTR_NONE;
664  curcolor=OWL_COLOR_DEFAULT;
665  stacksize=0;
666  txtptr=text;
667  while (1) {
668    ptr=strpbrk(txtptr, "@{[<()>]}");
669    if (!ptr) {
670      /* add all the rest of the text and exit */
671      owl_fmtext_append_attr(f, txtptr, curattrs, curcolor, OWL_COLOR_DEFAULT);
672      return;
673    } else if (ptr[0]=='@') {
674      /* add the text up to this point then deal with the stack */
675      buff=owl_malloc(ptr-txtptr+20);
676      strncpy(buff, txtptr, ptr-txtptr);
677      buff[ptr-txtptr]='\0';
678      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
679      owl_free(buff);
680
681      /* update pointer to point at the @ */
682      txtptr=ptr;
683
684      /* now the stack */
685
686      /* if we've hit our max stack depth, print the @ and move on */
687      if (stacksize==32) {
688        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
689        txtptr++;
690        continue;
691      }
692
693      /* if it's an @@, print an @ and continue */
694      if (txtptr[1]=='@') {
695        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
696        txtptr+=2;
697        continue;
698      }
699       
700      /* if there's no opener, print the @ and continue */
701      tmpptr=strpbrk(txtptr, "(<[{ ");
702      if (!tmpptr || tmpptr[0]==' ') {
703        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
704        txtptr++;
705        continue;
706      }
707
708      /* check what command we've got, push it on the stack, start
709         using it, and continue ... unless it's a color command */
710      buff=owl_malloc(tmpptr-ptr+20);
711      strncpy(buff, ptr, tmpptr-ptr);
712      buff[tmpptr-ptr]='\0';
713      if (!strcasecmp(buff, "@bold")) {
714        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
715        chrstack[stacksize]=tmpptr[0];
716        colorstack[stacksize]=curcolor;
717        stacksize++;
718        curattrs|=OWL_FMTEXT_ATTR_BOLD;
719        txtptr+=6;
720        owl_free(buff);
721        continue;
722      } else if (!strcasecmp(buff, "@b")) {
723        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
724        chrstack[stacksize]=tmpptr[0];
725        colorstack[stacksize]=curcolor;
726        stacksize++;
727        curattrs|=OWL_FMTEXT_ATTR_BOLD;
728        txtptr+=3;
729        owl_free(buff);
730        continue;
731      } else if (!strcasecmp(buff, "@i")) {
732        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
733        chrstack[stacksize]=tmpptr[0];
734        colorstack[stacksize]=curcolor;
735        stacksize++;
736        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
737        txtptr+=3;
738        owl_free(buff);
739        continue;
740      } else if (!strcasecmp(buff, "@italic")) {
741        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
742        chrstack[stacksize]=tmpptr[0];
743        colorstack[stacksize]=curcolor;
744        stacksize++;
745        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
746        txtptr+=8;
747        owl_free(buff);
748        continue;
749      } else if (!strcasecmp(buff, "@")) {
750        attrstack[stacksize]=OWL_FMTEXT_ATTR_NONE;
751        chrstack[stacksize]=tmpptr[0];
752        colorstack[stacksize]=curcolor;
753        stacksize++;
754        txtptr+=2;
755        owl_free(buff);
756        continue;
757
758        /* if it's a color read the color, set the current color and
759           continue */
760      } else if (!strcasecmp(buff, "@color") 
761                 && owl_global_get_hascolors(&g)
762                 && owl_global_is_colorztext(&g)) {
763        owl_free(buff);
764        txtptr+=7;
765        tmpptr=strpbrk(txtptr, "@{[<()>]}");
766        if (tmpptr &&
767            ((txtptr[-1]=='(' && tmpptr[0]==')') ||
768             (txtptr[-1]=='<' && tmpptr[0]=='>') ||
769             (txtptr[-1]=='[' && tmpptr[0]==']') ||
770             (txtptr[-1]=='{' && tmpptr[0]=='}'))) {
771
772          /* grab the color name */
773          buff=owl_malloc(tmpptr-txtptr+20);
774          strncpy(buff, txtptr, tmpptr-txtptr);
775          buff[tmpptr-txtptr]='\0';
776
777          /* set it as the current color */
778          curcolor=owl_util_string_to_color(buff);
779          if (curcolor == OWL_COLOR_INVALID)
780              curcolor = OWL_COLOR_DEFAULT;
781          owl_free(buff);
782          txtptr=tmpptr+1;
783          continue;
784
785        } else {
786
787        }
788
789      } else {
790        /* if we didn't understand it, we'll print it.  This is different from zwgc
791         * but zwgc seems to be smarter about some screw cases than I am
792         */
793        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
794        txtptr++;
795        continue;
796      }
797
798    } else if (ptr[0]=='}' || ptr[0]==']' || ptr[0]==')' || ptr[0]=='>') {
799      /* add the text up to this point first */
800      buff=owl_malloc(ptr-txtptr+20);
801      strncpy(buff, txtptr, ptr-txtptr);
802      buff[ptr-txtptr]='\0';
803      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
804      owl_free(buff);
805
806      /* now deal with the closer */
807      txtptr=ptr;
808
809      /* first, if the stack is empty we must bail (just print and go) */
810      if (stacksize==0) {
811        buff=owl_malloc(5);
812        buff[0]=ptr[0];
813        buff[1]='\0';
814        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
815        owl_free(buff);
816        txtptr++;
817        continue;
818      }
819
820      /* if the closing char is what's on the stack, turn off the
821         attribue and pop the stack */
822      if ((ptr[0]==')' && chrstack[stacksize-1]=='(') ||
823          (ptr[0]=='>' && chrstack[stacksize-1]=='<') ||
824          (ptr[0]==']' && chrstack[stacksize-1]=='[') ||
825          (ptr[0]=='}' && chrstack[stacksize-1]=='{')) {
826        int i;
827        stacksize--;
828        curattrs=OWL_FMTEXT_ATTR_NONE;
829        curcolor = colorstack[stacksize];
830        for (i=0; i<stacksize; i++) {
831          curattrs|=attrstack[i];
832        }
833        txtptr+=1;
834        continue;
835      } else {
836        /* otherwise print and continue */
837        buff=owl_malloc(5);
838        buff[0]=ptr[0];
839        buff[1]='\0';
840        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
841        owl_free(buff);
842        txtptr++;
843        continue;
844      }
845    } else {
846      /* we've found an unattached opener, print everything and move on */
847      buff=owl_malloc(ptr-txtptr+20);
848      strncpy(buff, txtptr, ptr-txtptr+1);
849      buff[ptr-txtptr+1]='\0';
850      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
851      owl_free(buff);
852      txtptr=ptr+1;
853      continue;
854    }
855  }
856}
857
858/* requires that the list values are strings or NULL.
859 * joins the elements together with join_with.
860 * If format_fn is specified, passes it the list element value
861 * and it will return a string which this needs to free. */
862void owl_fmtext_append_list(owl_fmtext *f, const owl_list *l, const char *join_with, char *(format_fn)(const char *))
863{
864  int i, size;
865  const char *elem;
866  char *text;
867
868  size = owl_list_get_size(l);
869  for (i=0; i<size; i++) {
870    elem = owl_list_get_element(l,i);
871    if (elem && format_fn) {
872      text = format_fn(elem);
873      if (text) {
874        owl_fmtext_append_normal(f, text);
875        owl_free(text);
876      }
877    } else if (elem) {
878      owl_fmtext_append_normal(f, elem);
879    }
880    if ((i < size-1) && join_with) {
881      owl_fmtext_append_normal(f, join_with);
882    }
883  }
884}
885
886/* Free all memory allocated by the object */
887void owl_fmtext_cleanup(owl_fmtext *f)
888{
889  if (f->textbuff) owl_free(f->textbuff);
890}
891
892/*** Color Pair manager ***/
893void owl_fmtext_init_colorpair_mgr(owl_colorpair_mgr *cpmgr)
894{
895  /* This could be a bitarray if we wanted to save memory. */
896  short i, j;
897  cpmgr->next = 8;
898 
899  /* The test is <= because we allocate COLORS+1 entries. */
900  cpmgr->pairs = owl_malloc((COLORS+1) * sizeof(short*));
901  for(i = 0; i <= COLORS; i++) {
902    cpmgr->pairs[i] = owl_malloc((COLORS+1) * sizeof(short));
903    for(j = 0; j <= COLORS; j++) {
904      cpmgr->pairs[i][j] = -1;
905    }
906  }
907  if (owl_global_get_hascolors(&g)) {
908    for(i = 0; i < 8; i++) {
909      short fg, bg;
910      if (i >= COLORS) continue;
911      pair_content(i, &fg, &bg);
912      cpmgr->pairs[fg+1][bg+1] = i;
913    }
914  }
915}
916
917/* Reset used list */
918void owl_fmtext_reset_colorpairs(void)
919{
920  if (owl_global_get_hascolors(&g)) {
921    short i, j;
922    owl_colorpair_mgr *cpmgr = owl_global_get_colorpair_mgr(&g);
923    cpmgr->next = 8;
924   
925    /* The test is <= because we allocated COLORS+1 entries. */
926    for(i = 0; i <= COLORS; i++) {
927      for(j = 0; j <= COLORS; j++) {
928        cpmgr->pairs[i][j] = -1;
929      }
930    }
931    for(i = 0; i < 8; i++) {
932      short fg, bg;
933      if (i >= COLORS) continue;
934      pair_content(i, &fg, &bg);
935      cpmgr->pairs[fg+1][bg+1] = i;
936    }
937  }
938}
939
940/* Assign pairs by request */
941short owl_fmtext_get_colorpair(int fg, int bg)
942{
943  owl_colorpair_mgr *cpmgr;
944  short pair;
945
946  /* Sanity (Bounds) Check */
947  if (fg > COLORS || fg < OWL_COLOR_DEFAULT) fg = OWL_COLOR_DEFAULT;
948  if (bg > COLORS || bg < OWL_COLOR_DEFAULT) bg = OWL_COLOR_DEFAULT;
949           
950#ifdef HAVE_USE_DEFAULT_COLORS
951  if (fg == OWL_COLOR_DEFAULT) fg = -1;
952#else
953  if (fg == OWL_COLOR_DEFAULT) fg = 0;
954  if (bg == OWL_COLOR_DEFAULT) bg = 0;
955#endif
956
957  /* looking for a pair we already set up for this draw. */
958  cpmgr = owl_global_get_colorpair_mgr(&g);
959  pair = cpmgr->pairs[fg+1][bg+1];
960  if (!(pair != -1 && pair < cpmgr->next)) {
961    /* If we didn't find a pair, search for a free one to assign. */
962    pair = (cpmgr->next < COLOR_PAIRS) ? cpmgr->next : -1;
963    if (pair != -1) {
964      /* We found a free pair, initialize it. */
965      init_pair(pair, fg, bg);
966      cpmgr->pairs[fg+1][bg+1] = pair;
967      cpmgr->next++;
968    }
969    else if (bg != OWL_COLOR_DEFAULT) {
970      /* We still don't have a pair, drop the background color. Too bad. */
971      owl_function_debugmsg("colorpairs: color shortage - dropping background color.");
972      pair = owl_fmtext_get_colorpair(fg, OWL_COLOR_DEFAULT);
973    }
974    else {
975      /* We still don't have a pair, defaults all around. */
976      owl_function_debugmsg("colorpairs: color shortage - dropping foreground and background color.");
977      pair = 0;
978    }
979  }
980  return pair;
981}
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