2 /* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
3 Written by Gaius Mulley (gaius@glam.ac.uk)
5 This file is part of groff.
7 groff is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License along
18 with groff; see the file COPYING. If not, write to the Free Software
19 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
23 extern int debug_state;
27 #include "stringclass.h"
31 static int no_of_statems = 0; // debugging aid
33 int_value::int_value()
34 : value(0), is_known(0)
38 int_value::~int_value()
42 void int_value::diff(FILE *fp, const char *s, int_value compare)
44 if (differs(compare)) {
48 fputs(i_to_a(compare.value), fp);
50 value = compare.value;
57 void int_value::set(int v)
63 void int_value::unset()
68 void int_value::set_if_unknown(int v)
74 int int_value::differs(int_value compare)
76 return compare.is_known
77 && (!is_known || value != compare.value);
80 bool_value::bool_value()
84 bool_value::~bool_value()
88 void bool_value::diff(FILE *fp, const char *s, bool_value compare)
90 if (differs(compare)) {
94 value = compare.value;
101 units_value::units_value()
105 units_value::~units_value()
109 void units_value::diff(FILE *fp, const char *s, units_value compare)
111 if (differs(compare)) {
115 fputs(i_to_a(compare.value), fp);
117 value = compare.value;
124 void units_value::set(hunits v)
127 value = v.to_units();
130 int units_value::differs(units_value compare)
132 return compare.is_known
133 && (!is_known || value != compare.value);
136 string_value::string_value()
137 : value(string("")), is_known(0)
141 string_value::~string_value()
145 void string_value::diff(FILE *fp, const char *s, string_value compare)
147 if (differs(compare)) {
151 fputs(compare.value.contents(), fp);
153 value = compare.value;
158 void string_value::set(string v)
164 void string_value::unset()
169 int string_value::differs(string_value compare)
171 return compare.is_known
172 && (!is_known || value != compare.value);
177 issue_no = no_of_statems;
181 statem::statem(statem *copy)
184 for (i = 0; i < LAST_BOOL; i++)
185 bool_values[i] = copy->bool_values[i];
186 for (i = 0; i < LAST_INT; i++)
187 int_values[i] = copy->int_values[i];
188 for (i = 0; i < LAST_UNITS; i++)
189 units_values[i] = copy->units_values[i];
190 for (i = 0; i < LAST_STRING; i++)
191 string_values[i] = copy->string_values[i];
192 issue_no = copy->issue_no;
199 void statem::flush(FILE *fp, statem *compare)
201 int_values[MTSM_FI].diff(fp, "devtag:.fi",
202 compare->int_values[MTSM_FI]);
203 int_values[MTSM_RJ].diff(fp, "devtag:.rj",
204 compare->int_values[MTSM_RJ]);
205 int_values[MTSM_SP].diff(fp, "devtag:.sp",
206 compare->int_values[MTSM_SP]);
207 units_values[MTSM_IN].diff(fp, "devtag:.in",
208 compare->units_values[MTSM_IN]);
209 units_values[MTSM_LL].diff(fp, "devtag:.ll",
210 compare->units_values[MTSM_LL]);
211 units_values[MTSM_PO].diff(fp, "devtag:.po",
212 compare->units_values[MTSM_PO]);
213 string_values[MTSM_TA].diff(fp, "devtag:.ta",
214 compare->string_values[MTSM_TA]);
215 units_values[MTSM_TI].diff(fp, "devtag:.ti",
216 compare->units_values[MTSM_TI]);
217 int_values[MTSM_CE].diff(fp, "devtag:.ce",
218 compare->int_values[MTSM_CE]);
219 bool_values[MTSM_EOL].diff(fp, "devtag:.eol",
220 compare->bool_values[MTSM_EOL]);
221 bool_values[MTSM_BR].diff(fp, "devtag:.br",
222 compare->bool_values[MTSM_BR]);
224 fprintf(stderr, "compared state %d\n", compare->issue_no);
229 void statem::add_tag(int_value_state t, int v)
231 int_values[t].set(v);
234 void statem::add_tag(units_value_state t, hunits v)
236 units_values[t].set(v);
239 void statem::add_tag(bool_value_state t)
241 bool_values[t].set(1);
244 void statem::add_tag(string_value_state t, string v)
246 string_values[t].set(v);
249 void statem::add_tag_if_unknown(int_value_state t, int v)
251 int_values[t].set_if_unknown(v);
254 void statem::sub_tag_ce()
256 int_values[MTSM_CE].unset();
260 * add_tag_ta - add the tab settings to the minimum troff state machine
263 void statem::add_tag_ta()
266 string s = string("");
270 t = curenv->tabs.distance_to_next_tab(l, &d);
275 s += as_string(l.to_units());
279 s += as_string(l.to_units());
283 s += as_string(l.to_units());
288 } while (t != TAB_NONE && l < curenv->get_line_length());
290 string_values[MTSM_TA].set(s);
294 void statem::update(statem *older, statem *newer, int_value_state t)
296 if (newer->int_values[t].differs(older->int_values[t])
297 && !newer->int_values[t].is_known)
298 newer->int_values[t].set(older->int_values[t].value);
301 void statem::update(statem *older, statem *newer, units_value_state t)
303 if (newer->units_values[t].differs(older->units_values[t])
304 && !newer->units_values[t].is_known)
305 newer->units_values[t].set(older->units_values[t].value);
308 void statem::update(statem *older, statem *newer, bool_value_state t)
310 if (newer->bool_values[t].differs(older->bool_values[t])
311 && !newer->bool_values[t].is_known)
312 newer->bool_values[t].set(older->bool_values[t].value);
315 void statem::update(statem *older, statem *newer, string_value_state t)
317 if (newer->string_values[t].differs(older->string_values[t])
318 && !newer->string_values[t].is_known)
319 newer->string_values[t].set(older->string_values[t].value);
322 void statem::merge(statem *newer, statem *older)
324 if (newer == 0 || older == 0)
326 update(older, newer, MTSM_EOL);
327 update(older, newer, MTSM_BR);
328 update(older, newer, MTSM_FI);
329 update(older, newer, MTSM_LL);
330 update(older, newer, MTSM_PO);
331 update(older, newer, MTSM_RJ);
332 update(older, newer, MTSM_SP);
333 update(older, newer, MTSM_TA);
334 update(older, newer, MTSM_TI);
335 update(older, newer, MTSM_CE);
343 stack::stack(statem *s, stack *n)
359 driver = new statem();
370 * push_state - push the current troff state and use `n' as
371 * the new troff state.
374 void mtsm::push_state(statem *n)
377 #if defined(DEBUGGING)
379 fprintf(stderr, "--> state %d pushed\n", n->issue_no) ; fflush(stderr);
381 sp = new stack(n, sp);
385 void mtsm::pop_state()
388 #if defined(DEBUGGING)
390 fprintf(stderr, "--> state popped\n") ; fflush(stderr);
393 fatal("empty state machine stack");
405 * inherit - scan the stack and collects inherited values.
408 void mtsm::inherit(statem *s, int reset_bool)
410 if (sp && sp->state) {
411 if (s->units_values[MTSM_IN].is_known
412 && sp->state->units_values[MTSM_IN].is_known)
413 s->units_values[MTSM_IN].value += sp->state->units_values[MTSM_IN].value;
414 s->update(sp->state, s, MTSM_FI);
415 s->update(sp->state, s, MTSM_LL);
416 s->update(sp->state, s, MTSM_PO);
417 s->update(sp->state, s, MTSM_RJ);
418 s->update(sp->state, s, MTSM_TA);
419 s->update(sp->state, s, MTSM_TI);
420 s->update(sp->state, s, MTSM_CE);
421 if (sp->state->bool_values[MTSM_BR].is_known
422 && sp->state->bool_values[MTSM_BR].value) {
424 sp->state->bool_values[MTSM_BR].set(0);
425 s->bool_values[MTSM_BR].set(1);
427 fprintf(stderr, "inherited br from pushed state %d\n",
428 sp->state->issue_no);
430 else if (s->bool_values[MTSM_BR].is_known
431 && s->bool_values[MTSM_BR].value)
432 if (! s->int_values[MTSM_CE].is_known)
433 s->bool_values[MTSM_BR].unset();
434 if (sp->state->bool_values[MTSM_EOL].is_known
435 && sp->state->bool_values[MTSM_EOL].value) {
437 sp->state->bool_values[MTSM_EOL].set(0);
438 s->bool_values[MTSM_EOL].set(1);
443 void mtsm::flush(FILE *fp, statem *s, string tag_list)
447 driver->flush(fp, s);
448 // Set rj, ce, ti to unknown if they were known and
449 // we have seen an eol or br. This ensures that these values
450 // are emitted during the next glyph (as they step from n..0
452 if ((driver->bool_values[MTSM_EOL].is_known
453 && driver->bool_values[MTSM_EOL].value)
454 || (driver->bool_values[MTSM_BR].is_known
455 && driver->bool_values[MTSM_BR].value)) {
456 if (driver->units_values[MTSM_TI].is_known)
457 driver->units_values[MTSM_TI].is_known = 0;
458 if (driver->int_values[MTSM_RJ].is_known
459 && driver->int_values[MTSM_RJ].value > 0)
460 driver->int_values[MTSM_RJ].is_known = 0;
461 if (driver->int_values[MTSM_CE].is_known
462 && driver->int_values[MTSM_CE].value > 0)
463 driver->int_values[MTSM_CE].is_known = 0;
465 // reset the boolean values
466 driver->bool_values[MTSM_BR].set(0);
467 driver->bool_values[MTSM_EOL].set(0);
469 driver->int_values[MTSM_SP].set(0);
470 // lastly write out any direct tag entries
471 if (tag_list != string("")) {
472 string t = tag_list + '\0';
473 fputs(t.contents(), fp);
479 * display_state - dump out a synopsis of the state to stderr.
482 void statem::display_state()
484 fprintf(stderr, " <state ");
485 if (bool_values[MTSM_BR].is_known)
486 if (bool_values[MTSM_BR].value)
487 fprintf(stderr, "[br]");
489 fprintf(stderr, "[!br]");
490 if (bool_values[MTSM_EOL].is_known)
491 if (bool_values[MTSM_EOL].value)
492 fprintf(stderr, "[eol]");
494 fprintf(stderr, "[!eol]");
495 if (int_values[MTSM_SP].is_known)
496 if (int_values[MTSM_SP].value)
497 fprintf(stderr, "[sp %d]", int_values[MTSM_SP].value);
499 fprintf(stderr, "[!sp]");
500 fprintf(stderr, ">");
504 int mtsm::has_changed(int_value_state t, statem *s)
506 return driver->int_values[t].differs(s->int_values[t]);
509 int mtsm::has_changed(units_value_state t, statem *s)
511 return driver->units_values[t].differs(s->units_values[t]);
514 int mtsm::has_changed(bool_value_state t, statem *s)
516 return driver->bool_values[t].differs(s->bool_values[t]);
519 int mtsm::has_changed(string_value_state t, statem *s)
521 return driver->string_values[t].differs(s->string_values[t]);
524 int mtsm::changed(statem *s)
526 if (s == 0 || !is_html)
530 int result = has_changed(MTSM_EOL, s)
531 || has_changed(MTSM_BR, s)
532 || has_changed(MTSM_FI, s)
533 || has_changed(MTSM_IN, s)
534 || has_changed(MTSM_LL, s)
535 || has_changed(MTSM_PO, s)
536 || has_changed(MTSM_RJ, s)
537 || has_changed(MTSM_SP, s)
538 || has_changed(MTSM_TA, s)
539 || has_changed(MTSM_CE, s);
544 void mtsm::add_tag(FILE *fp, string s)
548 fputs(s.contents(), fp);
555 state_set::state_set()
556 : boolset(0), intset(0), unitsset(0), stringset(0)
560 state_set::~state_set()
564 void state_set::incl(bool_value_state b)
566 boolset |= 1 << (int)b;
569 void state_set::incl(int_value_state i)
571 intset |= 1 << (int)i;
574 void state_set::incl(units_value_state u)
576 unitsset |= 1 << (int)u;
579 void state_set::incl(string_value_state s)
581 stringset |= 1 << (int)s;
584 void state_set::excl(bool_value_state b)
586 boolset &= ~(1 << (int)b);
589 void state_set::excl(int_value_state i)
591 intset &= ~(1 << (int)i);
594 void state_set::excl(units_value_state u)
596 unitsset &= ~(1 << (int)u);
599 void state_set::excl(string_value_state s)
601 stringset &= ~(1 << (int)s);
604 int state_set::is_in(bool_value_state b)
606 return (boolset & (1 << (int)b)) != 0;
609 int state_set::is_in(int_value_state i)
611 return (intset & (1 << (int)i)) != 0;
614 int state_set::is_in(units_value_state u)
616 return (unitsset & (1 << (int)u) != 0);
619 int state_set::is_in(string_value_state s)
621 return (stringset & (1 << (int)s) != 0);
624 void state_set::add(units_value_state, int n)
629 units state_set::val(units_value_state)