man_macro.c

   1 /*      $Id: man_macro.c,v 1.28 2009/08/22 09:10:38 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 };
  71
  72 const   struct man_macro * const man_macros = __man_macros;
  73
  74
  75 int
  76 man_unscope(struct man *m, const struct man_node *n)
  77 {
  78
  79         assert(n);
  80         m->next = MAN_NEXT_SIBLING;
  81
  82         /* LINTED */
  83         while (m->last != n) {
  84                 if ( ! man_valid_post(m))
  85                         return(0);
  86                 if ( ! man_action_post(m))
  87                         return(0);
  88                 m->last = m->last->parent;
  89                 assert(m->last);
  90         }
  91
  92         if ( ! man_valid_post(m))
  93                 return(0);
  94         return(man_action_post(m));
  95 }
  96
  97
  98 static int
  99 rew_block(int ntok, enum man_type type, const struct man_node *n)
 100 {
 101
 102         if (MAN_BLOCK == type && ntok == n->parent->tok &&
 103                         MAN_BODY == n->parent->type)
 104                 return(REW_REWIND);
 105         return(ntok == n->tok ? REW_HALT : REW_NOHALT);
 106 }
 107
 108
 109 /*
 110  * There are three scope levels: scoped to the root (all), scoped to the
 111  * section (all less sections), and scoped to subsections (all less
 112  * sections and subsections).
 113  */
 114 static int
 115 rew_dohalt(int tok, enum man_type type, const struct man_node *n)
 116 {
 117         int              c;
 118
 119         if (MAN_ROOT == n->type)
 120                 return(REW_HALT);
 121         assert(n->parent);
 122         if (MAN_ROOT == n->parent->type)
 123                 return(REW_REWIND);
 124         if (MAN_VALID & n->flags)
 125                 return(REW_NOHALT);
 126
 127         /* Rewind to ourselves, first. */
 128         if (type == n->type && tok == n->tok)
 129                 return(REW_REWIND);
 130
 131         switch (tok) {
 132         case (MAN_SH):
 133                 break;
 134         case (MAN_SS):
 135                 /* Rewind to a section, if a block. */
 136                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 137                         return(c);
 138                 break;
 139         case (MAN_RS):
 140                 /* Rewind to a subsection, if a block. */
 141                 if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
 142                         return(c);
 143                 /* Rewind to a section, if a block. */
 144                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 145                         return(c);
 146                 break;
 147         default:
 148                 /* Rewind to an offsetter, if a block. */
 149                 if (REW_NOHALT != (c = rew_block(MAN_RS, type, n)))
 150                         return(c);
 151                 /* Rewind to a subsection, if a block. */
 152                 if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
 153                         return(c);
 154                 /* Rewind to a section, if a block. */
 155                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 156                         return(c);
 157                 break;
 158         }
 159
 160         return(REW_NOHALT);
 161 }
 162
 163
 164 /*
 165  * Rewinding entails ascending the parse tree until a coherent point,
 166  * for example, the `SH' macro will close out any intervening `SS'
 167  * scopes.  When a scope is closed, it must be validated and actioned.
 168  */
 169 static int
 170 rew_scope(enum man_type type, struct man *m, int tok)
 171 {
 172         struct man_node *n;
 173         int              c;
 174
 175         /* LINTED */
 176         for (n = m->last; n; n = n->parent) {
 177                 /*
 178                  * Whether we should stop immediately (REW_HALT), stop
 179                  * and rewind until this point (REW_REWIND), or keep
 180                  * rewinding (REW_NOHALT).
 181                  */
 182                 c = rew_dohalt(tok, type, n);
 183                 if (REW_HALT == c)
 184                         return(1);
 185                 if (REW_REWIND == c)
 186                         break;
 187         }
 188
 189         /* Rewind until the current point. */
 190
 191         assert(n);
 192         return(man_unscope(m, n));
 193 }
 194
 195
 196 /* ARGSUSED */
 197 int
 198 blk_close(MACRO_PROT_ARGS)
 199 {
 200         int                      ntok;
 201         const struct man_node   *nn;
 202
 203         switch (tok) {
 204         case (MAN_RE):
 205                 ntok = MAN_RS;
 206                 break;
 207         default:
 208                 abort();
 209                 /* NOTREACHED */
 210         }
 211
 212         for (nn = m->last->parent; nn; nn = nn->parent)
 213                 if (ntok == nn->tok)
 214                         break;
 215
 216         if (NULL == nn)
 217                 if ( ! man_pwarn(m, line, ppos, WNOSCOPE))
 218                         return(0);
 219
 220         if ( ! rew_scope(MAN_BODY, m, ntok))
 221                 return(0);
 222         if ( ! rew_scope(MAN_BLOCK, m, ntok))
 223                 return(0);
 224         m->next = MAN_NEXT_SIBLING;
 225         return(1);
 226 }
 227
 228
 229 /*
 230  * Parse an implicit-block macro.  These contain a MAN_HEAD and a
 231  * MAN_BODY contained within a MAN_BLOCK.  Rules for closing out other
 232  * scopes, such as `SH' closing out an `SS', are defined in the rew
 233  * routines.
 234  */
 235 int
 236 blk_imp(MACRO_PROT_ARGS)
 237 {
 238         int              w, la;
 239         char            *p;
 240         struct man_node *n;
 241
 242         /* Close out prior scopes. */
 243
 244         if ( ! rew_scope(MAN_BODY, m, tok))
 245                 return(0);
 246         if ( ! rew_scope(MAN_BLOCK, m, tok))
 247                 return(0);
 248
 249         /* Allocate new block & head scope. */
 250
 251         if ( ! man_block_alloc(m, line, ppos, tok))
 252                 return(0);
 253         if ( ! man_head_alloc(m, line, ppos, tok))
 254                 return(0);
 255
 256         n = m->last;
 257
 258         /* Add line arguments. */
 259
 260         for (;;) {
 261                 la = *pos;
 262                 w = man_args(m, line, pos, buf, &p);
 263
 264                 if (-1 == w)
 265                         return(0);
 266                 if (0 == w)
 267                         break;
 268
 269                 if ( ! man_word_alloc(m, line, la, p))
 270                         return(0);
 271         }
 272
 273         /* Close out head and open body (unless MAN_SCOPE). */
 274
 275         if (MAN_SCOPED & man_macros[tok].flags) {
 276                 /* If we're forcing scope (`TP'), keep it open. */
 277                 if (MAN_FSCOPED & man_macros[tok].flags) {
 278                         m->flags |= MAN_BLINE;
 279                         return(1);
 280                 } else if (n == m->last) {
 281                         m->flags |= MAN_BLINE;
 282                         return(1);
 283                 }
 284         }
 285
 286         if ( ! rew_scope(MAN_HEAD, m, tok))
 287                 return(0);
 288
 289         return(man_body_alloc(m, line, ppos, tok));
 290 }
 291
 292
 293 int
 294 in_line_eoln(MACRO_PROT_ARGS)
 295 {
 296         int              w, la;
 297         char            *p;
 298         struct man_node *n;
 299
 300         if ( ! man_elem_alloc(m, line, ppos, tok))
 301                 return(0);
 302
 303         n = m->last;
 304
 305         for (;;) {
 306                 la = *pos;
 307                 w = man_args(m, line, pos, buf, &p);
 308
 309                 if (-1 == w)
 310                         return(0);
 311                 if (0 == w)
 312                         break;
 313
 314                 if ( ! man_word_alloc(m, line, la, p))
 315                         return(0);
 316         }
 317
 318         if (n == m->last && MAN_SCOPED & man_macros[tok].flags) {
 319                 m->flags |= MAN_ELINE;
 320                 return(1);
 321         }
 322
 323         /*
 324          * Note that when TH is pruned, we'll be back at the root, so
 325          * make sure that we don't clobber as its sibling.
 326          */
 327
 328         for ( ; m->last; m->last = m->last->parent) {
 329                 if (m->last == n)
 330                         break;
 331                 if (m->last->type == MAN_ROOT)
 332                         break;
 333                 if ( ! man_valid_post(m))
 334                         return(0);
 335                 if ( ! man_action_post(m))
 336                         return(0);
 337         }
 338
 339         assert(m->last);
 340
 341         /*
 342          * Same here regarding whether we're back at the root.
 343          */
 344
 345         if (m->last->type != MAN_ROOT && ! man_valid_post(m))
 346                 return(0);
 347         if (m->last->type != MAN_ROOT && ! man_action_post(m))
 348                 return(0);
 349         if (m->last->type != MAN_ROOT)
 350                 m->next = MAN_NEXT_SIBLING;
 351
 352         return(1);
 353 }
 354
 355
 356 int
 357 man_macroend(struct man *m)
 358 {
 359         struct man_node *n;
 360
 361         n = MAN_VALID & m->last->flags ?
 362                 m->last->parent : m->last;
 363
 364         for ( ; n; n = n->parent) {
 365                 if (MAN_BLOCK != n->type)
 366                         continue;
 367                 if ( ! (MAN_EXPLICIT & man_macros[n->tok].flags))
 368                         continue;
 369                 if ( ! man_nwarn(m, n, WEXITSCOPE))
 370                         return(0);
 371         }
 372
 373         return(man_unscope(m, m->first));
 374 }
 375