external/bsd/mdocml/dist/man_macro.c

   1 /*      $Vendor-Id: man_macro.c,v 1.29 2009/10/24 05:45:05 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #include <assert.h>
  18 #include <ctype.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21
  22 #include "libman.h"
  23
  24 #define REW_REWIND      (0)             /* See rew_scope(). */
  25 #define REW_NOHALT      (1)             /* See rew_scope(). */
  26 #define REW_HALT        (2)             /* See rew_scope(). */
  27
  28 static  int              in_line_eoln(MACRO_PROT_ARGS);
  29 static  int              blk_imp(MACRO_PROT_ARGS);
  30 static  int              blk_close(MACRO_PROT_ARGS);
  31
  32 static  int              rew_scope(enum man_type, struct man *, int);
  33 static  int              rew_dohalt(int, enum man_type,
  34                                 const struct man_node *);
  35 static  int              rew_block(int, enum man_type,
  36                                 const struct man_node *);
  37
  38 const   struct man_macro __man_macros[MAN_MAX] = {
  39         { in_line_eoln, 0 }, /* br */
  40         { in_line_eoln, 0 }, /* TH */
  41         { blk_imp, MAN_SCOPED }, /* SH */
  42         { blk_imp, MAN_SCOPED }, /* SS */
  43         { blk_imp, MAN_SCOPED | MAN_FSCOPED }, /* TP */
  44         { blk_imp, 0 }, /* LP */
  45         { blk_imp, 0 }, /* PP */
  46         { blk_imp, 0 }, /* P */
  47         { blk_imp, 0 }, /* IP */
  48         { blk_imp, 0 }, /* HP */
  49         { in_line_eoln, MAN_SCOPED }, /* SM */
  50         { in_line_eoln, MAN_SCOPED }, /* SB */
  51         { in_line_eoln, 0 }, /* BI */
  52         { in_line_eoln, 0 }, /* IB */
  53         { in_line_eoln, 0 }, /* BR */
  54         { in_line_eoln, 0 }, /* RB */
  55         { in_line_eoln, MAN_SCOPED }, /* R */
  56         { in_line_eoln, MAN_SCOPED }, /* B */
  57         { in_line_eoln, MAN_SCOPED }, /* I */
  58         { in_line_eoln, 0 }, /* IR */
  59         { in_line_eoln, 0 }, /* RI */
  60         { in_line_eoln, 0 }, /* na */
  61         { in_line_eoln, 0 }, /* i */
  62         { in_line_eoln, 0 }, /* sp */
  63         { in_line_eoln, 0 }, /* nf */
  64         { in_line_eoln, 0 }, /* fi */
  65         { in_line_eoln, 0 }, /* r */
  66         { blk_close, 0 }, /* RE */
  67         { blk_imp, MAN_EXPLICIT }, /* RS */
  68         { in_line_eoln, 0 }, /* DT */
  69         { in_line_eoln, 0 }, /* UC */
  70         { in_line_eoln, 0 }, /* PD */
  71 };
  72
  73 const   struct man_macro * const man_macros = __man_macros;
  74
  75
  76 int
  77 man_unscope(struct man *m, const struct man_node *n)
  78 {
  79
  80         assert(n);
  81         m->next = MAN_NEXT_SIBLING;
  82
  83         /* LINTED */
  84         while (m->last != n) {
  85                 if ( ! man_valid_post(m))
  86                         return(0);
  87                 if ( ! man_action_post(m))
  88                         return(0);
  89                 m->last = m->last->parent;
  90                 assert(m->last);
  91         }
  92
  93         if ( ! man_valid_post(m))
  94                 return(0);
  95         return(man_action_post(m));
  96 }
  97
  98
  99 static int
 100 rew_block(int ntok, enum man_type type, const struct man_node *n)
 101 {
 102
 103         if (MAN_BLOCK == type && ntok == n->parent->tok &&
 104                         MAN_BODY == n->parent->type)
 105                 return(REW_REWIND);
 106         return(ntok == n->tok ? REW_HALT : REW_NOHALT);
 107 }
 108
 109
 110 /*
 111  * There are three scope levels: scoped to the root (all), scoped to the
 112  * section (all less sections), and scoped to subsections (all less
 113  * sections and subsections).
 114  */
 115 static int
 116 rew_dohalt(int tok, enum man_type type, const struct man_node *n)
 117 {
 118         int              c;
 119
 120         if (MAN_ROOT == n->type)
 121                 return(REW_HALT);
 122         assert(n->parent);
 123         if (MAN_ROOT == n->parent->type)
 124                 return(REW_REWIND);
 125         if (MAN_VALID & n->flags)
 126                 return(REW_NOHALT);
 127
 128         /* Rewind to ourselves, first. */
 129         if (type == n->type && tok == n->tok)
 130                 return(REW_REWIND);
 131
 132         switch (tok) {
 133         case (MAN_SH):
 134                 break;
 135         case (MAN_SS):
 136                 /* Rewind to a section, if a block. */
 137                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 138                         return(c);
 139                 break;
 140         case (MAN_RS):
 141                 /* Rewind to a subsection, if a block. */
 142                 if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
 143                         return(c);
 144                 /* Rewind to a section, if a block. */
 145                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 146                         return(c);
 147                 break;
 148         default:
 149                 /* Rewind to an offsetter, if a block. */
 150                 if (REW_NOHALT != (c = rew_block(MAN_RS, type, n)))
 151                         return(c);
 152                 /* Rewind to a subsection, if a block. */
 153                 if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
 154                         return(c);
 155                 /* Rewind to a section, if a block. */
 156                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 157                         return(c);
 158                 break;
 159         }
 160
 161         return(REW_NOHALT);
 162 }
 163
 164
 165 /*
 166  * Rewinding entails ascending the parse tree until a coherent point,
 167  * for example, the `SH' macro will close out any intervening `SS'
 168  * scopes.  When a scope is closed, it must be validated and actioned.
 169  */
 170 static int
 171 rew_scope(enum man_type type, struct man *m, int tok)
 172 {
 173         struct man_node *n;
 174         int              c;
 175
 176         /* LINTED */
 177         for (n = m->last; n; n = n->parent) {
 178                 /*
 179                  * Whether we should stop immediately (REW_HALT), stop
 180                  * and rewind until this point (REW_REWIND), or keep
 181                  * rewinding (REW_NOHALT).
 182                  */
 183                 c = rew_dohalt(tok, type, n);
 184                 if (REW_HALT == c)
 185                         return(1);
 186                 if (REW_REWIND == c)
 187                         break;
 188         }
 189
 190         /* Rewind until the current point. */
 191
 192         assert(n);
 193         return(man_unscope(m, n));
 194 }
 195
 196
 197 /* ARGSUSED */
 198 int
 199 blk_close(MACRO_PROT_ARGS)
 200 {
 201         int                      ntok;
 202         const struct man_node   *nn;
 203
 204         switch (tok) {
 205         case (MAN_RE):
 206                 ntok = MAN_RS;
 207                 break;
 208         default:
 209                 abort();
 210                 /* NOTREACHED */
 211         }
 212
 213         for (nn = m->last->parent; nn; nn = nn->parent)
 214                 if (ntok == nn->tok)
 215                         break;
 216
 217         if (NULL == nn)
 218                 if ( ! man_pwarn(m, line, ppos, WNOSCOPE))
 219                         return(0);
 220
 221         if ( ! rew_scope(MAN_BODY, m, ntok))
 222                 return(0);
 223         if ( ! rew_scope(MAN_BLOCK, m, ntok))
 224                 return(0);
 225         m->next = MAN_NEXT_SIBLING;
 226         return(1);
 227 }
 228
 229
 230 /*
 231  * Parse an implicit-block macro.  These contain a MAN_HEAD and a
 232  * MAN_BODY contained within a MAN_BLOCK.  Rules for closing out other
 233  * scopes, such as `SH' closing out an `SS', are defined in the rew
 234  * routines.
 235  */
 236 int
 237 blk_imp(MACRO_PROT_ARGS)
 238 {
 239         int              w, la;
 240         char            *p;
 241         struct man_node *n;
 242
 243         /* Close out prior scopes. */
 244
 245         if ( ! rew_scope(MAN_BODY, m, tok))
 246                 return(0);
 247         if ( ! rew_scope(MAN_BLOCK, m, tok))
 248                 return(0);
 249
 250         /* Allocate new block & head scope. */
 251
 252         if ( ! man_block_alloc(m, line, ppos, tok))
 253                 return(0);
 254         if ( ! man_head_alloc(m, line, ppos, tok))
 255                 return(0);
 256
 257         n = m->last;
 258
 259         /* Add line arguments. */
 260
 261         for (;;) {
 262                 la = *pos;
 263                 w = man_args(m, line, pos, buf, &p);
 264
 265                 if (-1 == w)
 266                         return(0);
 267                 if (0 == w)
 268                         break;
 269
 270                 if ( ! man_word_alloc(m, line, la, p))
 271                         return(0);
 272         }
 273
 274         /* Close out head and open body (unless MAN_SCOPE). */
 275
 276         if (MAN_SCOPED & man_macros[tok].flags) {
 277                 /* If we're forcing scope (`TP'), keep it open. */
 278                 if (MAN_FSCOPED & man_macros[tok].flags) {
 279                         m->flags |= MAN_BLINE;
 280                         return(1);
 281                 } else if (n == m->last) {
 282                         m->flags |= MAN_BLINE;
 283                         return(1);
 284                 }
 285         }
 286
 287         if ( ! rew_scope(MAN_HEAD, m, tok))
 288                 return(0);
 289
 290         return(man_body_alloc(m, line, ppos, tok));
 291 }
 292
 293
 294 int
 295 in_line_eoln(MACRO_PROT_ARGS)
 296 {
 297         int              w, la;
 298         char            *p;
 299         struct man_node *n;
 300
 301         if ( ! man_elem_alloc(m, line, ppos, tok))
 302                 return(0);
 303
 304         n = m->last;
 305
 306         for (;;) {
 307                 la = *pos;
 308                 w = man_args(m, line, pos, buf, &p);
 309
 310                 if (-1 == w)
 311                         return(0);
 312                 if (0 == w)
 313                         break;
 314
 315                 if ( ! man_word_alloc(m, line, la, p))
 316                         return(0);
 317         }
 318
 319         if (n == m->last && MAN_SCOPED & man_macros[tok].flags) {
 320                 m->flags |= MAN_ELINE;
 321                 return(1);
 322         }
 323
 324         /*
 325          * Note that when TH is pruned, we'll be back at the root, so
 326          * make sure that we don't clobber as its sibling.
 327          */
 328
 329         for ( ; m->last; m->last = m->last->parent) {
 330                 if (m->last == n)
 331                         break;
 332                 if (m->last->type == MAN_ROOT)
 333                         break;
 334                 if ( ! man_valid_post(m))
 335                         return(0);
 336                 if ( ! man_action_post(m))
 337                         return(0);
 338         }
 339
 340         assert(m->last);
 341
 342         /*
 343          * Same here regarding whether we're back at the root.
 344          */
 345
 346         if (m->last->type != MAN_ROOT && ! man_valid_post(m))
 347                 return(0);
 348         if (m->last->type != MAN_ROOT && ! man_action_post(m))
 349                 return(0);
 350         if (m->last->type != MAN_ROOT)
 351                 m->next = MAN_NEXT_SIBLING;
 352
 353         return(1);
 354 }
 355
 356
 357 int
 358 man_macroend(struct man *m)
 359 {
 360         struct man_node *n;
 361
 362         n = MAN_VALID & m->last->flags ?
 363                 m->last->parent : m->last;
 364
 365         for ( ; n; n = n->parent) {
 366                 if (MAN_BLOCK != n->type)
 367                         continue;
 368                 if ( ! (MAN_EXPLICIT & man_macros[n->tok].flags))
 369                         continue;
 370                 if ( ! man_nwarn(m, n, WEXITSCOPE))
 371                         return(0);
 372         }
 373
 374         return(man_unscope(m, m->first));
 375 }
 376