mandoc should be a variable.

[mandoc.git] / roff.c

diff --git a/roff.c b/roff.c
index cd6fc6795c0e20b7c82f7a6522105f02043a52be..afea00b978b9320211ef56aac6a30d88901cca18 100644 (file)
--- a/roff.c
+++ b/roff.c
@@ -1,658 +1,426 @@
-/* $Id: roff.c,v 1.2 2008/11/24 18:32:39 kristaps Exp $ */
+/*     $Id: roff.c,v 1.76 2010/05/16 14:47:19 kristaps Exp $ */

 /*
 /*

- * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
+ * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>

  *
  * Permission to use, copy, modify, and distribute this software for any
  *
  * Permission to use, copy, modify, and distribute this software for any

- * purpose with or without fee is hereby granted, provided that the
- * above copyright notice and this permission notice appear in all
- * copies.
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.

  *
  *

- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
- * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
- * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

  */
  */

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+

 #include <assert.h>
 #include <assert.h>

-#include <ctype.h>
-#include <err.h>

 #include <stdlib.h>
 #include <stdlib.h>

-#include <stdio.h>

 #include <string.h>
 #include <string.h>

-#include <time.h>
-
-#include "libmdocml.h"
-#include "private.h"
-
-#define        ROFF_MAXARG       10
-
-enum   roffd { 
-       ROFF_ENTER = 0, 
-       ROFF_EXIT 
-};
-
-enum   rofftype { 
-       ROFF_TITLE, 
-       ROFF_COMMENT, 
-       ROFF_TEXT, 
-       ROFF_LAYOUT 
-};
+#include <stdio.h>

 
 

-#define        ROFFCALL_ARGS \
-       int tok, struct rofftree *tree, \
-       const char *argv[], enum roffd type
-
-struct rofftree;
-
-struct rofftok {
-       char             *name;
-       int             (*cb)(ROFFCALL_ARGS);
-       enum rofftype     type;
-       int               flags;
-#define        ROFF_NESTED      (1 << 0) 
-#define        ROFF_PARSED      (1 << 1)
-#define        ROFF_CALLABLE    (1 << 2)
-#define        ROFF_QUOTES      (1 << 3)
+#include "mandoc.h"
+#include "roff.h"
+
+#define        ROFF_CTL(c) \
+       ('.' == (c) || '\'' == (c))
+#if    0
+#define        ROFF_MDEBUG(p, str) \
+       fprintf(stderr, "%s: %s (%d:%d)\n", (str), \
+               roffs[(p)->last->tok].name, \
+               (p)->last->line, (p)->last->col)
+#else
+#define        ROFF_MDEBUG(p, str) while (/* CONSTCOND */ 0)
+#endif
+
+enum   rofft {
+       ROFF_if,
+       ROFF_ig,
+       ROFF_cblock,
+       ROFF_ccond,
+#if 0
+       ROFF_am,
+       ROFF_ami,
+       ROFF_de,
+       ROFF_dei,
+       ROFF_close,
+#endif
+       ROFF_MAX

 };
 
 };
 

-struct roffarg {
-       char             *name;
-       int               flags;
-#define        ROFF_VALUE       (1 << 0)
+struct roff {
+       struct roffnode *last; /* leaf of stack */
+       mandocmsg        msg; /* err/warn/fatal messages */
+       void            *data; /* privdata for messages */

 };
 
 struct roffnode {
 };
 
 struct roffnode {

-       int               tok;  
-       struct roffnode  *parent;
-       size_t            line;
+       enum rofft       tok; /* type of node */
+       struct roffnode *parent; /* up one in stack */
+       char            *end; /* end-token: custom */
+       int              line; /* parse line */
+       int              col; /* parse col */
+       int              endspan;

 };
 
 };
 

-struct rofftree {
-       struct roffnode  *last;
-       time_t            date;
-       char              title[256];
-       char              section[256];
-       char              volume[256];
-       int               state;
-#define        ROFF_PRELUDE     (1 << 1)
-#define        ROFF_PRELUDE_Os  (1 << 2)
-#define        ROFF_PRELUDE_Dt  (1 << 3)
-#define        ROFF_PRELUDE_Dd  (1 << 4)
-#define        ROFF_BODY        (1 << 5)
-       struct md_mbuf  *mbuf; /* NULL if ROFF_EXIT and error. */
-
-       const struct md_args    *args;
-       const struct md_rbuf    *rbuf;
-       const roffin            *roffin;
-       const roffblkin         *roffblkin;
-       const roffout           *roffout;
-       const roffblkout        *roffblkout;
-};
+#define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
+                        enum rofft tok, /* tok of macro */ \
+                        char **bufp, /* input buffer */ \
+                        size_t *szp, /* size of input buffer */ \
+                        int ln, /* parse line */ \
+                        int ppos, /* original pos in buffer */ \
+                        int pos, /* current pos in buffer */ \
+                        int *offs /* reset offset of buffer data */

 
 

-static int               roff_Dd(ROFFCALL_ARGS);
-static int               roff_Dt(ROFFCALL_ARGS);
-static int               roff_Os(ROFFCALL_ARGS);
-
-static int               roff_layout(ROFFCALL_ARGS);
-static int               roff_text(ROFFCALL_ARGS);
-
-static struct roffnode  *roffnode_new(int, size_t, 
-                               struct rofftree *);
-static void              roffnode_free(int, struct rofftree *);
-
-static int               rofffindtok(const char *);
-static int               rofffindarg(const char *);
-static int               rofffindcallable(const char *);
-static int               roffargs(int, char *, char **);
-static int               roffparse(struct rofftree *, char *, size_t);
-static int               textparse(const struct rofftree *,
-                               const char *, size_t);
-
-
-static const struct rofftok tokens[ROFF_MAX] = {
-       { "\\\"",    NULL, ROFF_COMMENT, 0 },
-       {   "Dd", roff_Dd, ROFF_TITLE, 0 },
-       {   "Dt", roff_Dt, ROFF_TITLE, 0 },
-       {   "Os", roff_Os, ROFF_TITLE, 0 },
-       {   "Sh", roff_layout, ROFF_LAYOUT, ROFF_PARSED },
-       {   "An", roff_text, ROFF_TEXT, ROFF_PARSED },
-       {   "Li", roff_text, ROFF_TEXT, ROFF_PARSED | ROFF_CALLABLE },
-};
+typedef        enum rofferr (*roffproc)(ROFF_ARGS);

 
 

-static const struct roffarg tokenargs[ROFF_ARGMAX] = {
-       {  "split",     0 },
-       {  "nosplit",   0 },
+struct roffmac {
+       const char      *name; /* macro name */
+       roffproc         proc;

 };
 
 };
 

+static enum rofferr     roff_if(ROFF_ARGS);
+static enum rofferr     roff_ig(ROFF_ARGS);
+static enum rofferr     roff_cblock(ROFF_ARGS);
+static enum rofferr     roff_ccond(ROFF_ARGS);
+
+const  struct roffmac   roffs[ROFF_MAX] = {
+       { "if", roff_if },
+       { "ig", roff_ig },
+       { ".", roff_cblock },
+       { "\\}", roff_ccond },
+#if 0
+       { "am", roff_sub_ig, roff_new_ig },
+       { "ami", roff_sub_ig, roff_new_ig },
+       { "de", roff_sub_ig, roff_new_ig },
+       { "dei", roff_sub_ig, roff_new_ig },
+#endif
+};

 
 

-int
-roff_free(struct rofftree *tree, int flush)
-{
-       int              error;
-
-       assert(tree->mbuf);
-       if ( ! flush)
-               tree->mbuf = NULL;
-
-       /* LINTED */
-       while (tree->last)
-               if ( ! (*tokens[tree->last->tok].cb)
-                               (tree->last->tok, tree, NULL, ROFF_EXIT))
-                       /* Disallow flushing. */
-                       tree->mbuf = NULL;
-
-       error = tree->mbuf ? 0 : 1;
-
-       if (tree->mbuf && (ROFF_PRELUDE & tree->state)) {
-               warnx("%s: prelude never finished", 
-                               tree->rbuf->name);
-               error = 1;
-       }
-
-       free(tree);
-       return(error ? 0 : 1);
-}
+static void             roff_free1(struct roff *);
+static enum rofft       roff_hash_find(const char *);
+static void             roffnode_cleanscope(struct roff *);
+static int              roffnode_push(struct roff *, 
+                               enum rofft, int, int);
+static void             roffnode_pop(struct roff *);
+static enum rofft       roff_parse(const char *, int *);

 
 
 
 

-struct rofftree *
-roff_alloc(const struct md_args *args, struct md_mbuf *out, 
-               const struct md_rbuf *in,
-               const roffin *roffin, const roffout *roffout,
-               const roffblkin *roffblkin, 
-               const roffblkout *roffblkout)
+/*
+ * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
+ * the nil-terminated string name could be found.
+ */
+static enum rofft
+roff_hash_find(const char *p)

 {
 {

-       struct rofftree *tree;
+       int              i;

 
 

-       if (NULL == (tree = calloc(1, sizeof(struct rofftree)))) {
-               warn("malloc");
-               return(NULL);
-       }
+       /* FIXME: make this be fast and efficient. */

 
 

-       tree->state = ROFF_PRELUDE;
-       tree->args = args;
-       tree->mbuf = out;
-       tree->rbuf = in;
-       tree->roffin = roffin;
-       tree->roffout = roffout;
-       tree->roffblkin = roffblkin;
-       tree->roffblkout = roffblkout;
+       for (i = 0; i < (int)ROFF_MAX; i++)
+               if (0 == strcmp(roffs[i].name, p))
+                       return((enum rofft)i);

 
 

-       return(tree);
+       return(ROFF_MAX);

 }
 
 
 }
 
 

-int
-roff_engine(struct rofftree *tree, char *buf, size_t sz)
+/*
+ * Pop the current node off of the stack of roff instructions currently
+ * pending.
+ */
+static void
+roffnode_pop(struct roff *r)

 {
 {

+       struct roffnode *p;

 
 

-       if (0 == sz) {
-               warnx("%s: blank line (line %zu)", 
-                               tree->rbuf->name, 
-                               tree->rbuf->line);
-               return(0);
-       } else if ('.' != *buf)
-               return(textparse(tree, buf, sz));
-
-       return(roffparse(tree, buf, sz));
+       assert(r->last);
+       p = r->last; 
+       r->last = r->last->parent;
+       if (p->end)
+               free(p->end);
+       free(p);

 }
 
 
 }
 
 

+/*
+ * Push a roff node onto the instruction stack.  This must later be
+ * removed with roffnode_pop().
+ */

 static int
 static int

-textparse(const struct rofftree *tree, const char *buf, size_t sz)
+roffnode_push(struct roff *r, enum rofft tok, int line, int col)

 {
 {

-       
-       if (NULL == tree->last) {
-               warnx("%s: unexpected text (line %zu)",
-                               tree->rbuf->name, 
-                               tree->rbuf->line);
-               return(0);
-       } else if (NULL == tree->last->parent) {
-               warnx("%s: disallowed text (line %zu)",
-                               tree->rbuf->name, 
-                               tree->rbuf->line);
+       struct roffnode *p;
+
+       if (NULL == (p = calloc(1, sizeof(struct roffnode)))) {
+               (*r->msg)(MANDOCERR_MEM, r->data, line, col, NULL);

                return(0);
        }
 
                return(0);
        }
 

-       /* Print text. */
+       p->tok = tok;
+       p->parent = r->last;
+       p->line = line;
+       p->col = col;

 
 

+       r->last = p;

        return(1);
 }
 
 
        return(1);
 }
 
 

-static int
-roffargs(int tok, char *buf, char **argv)
+static void
+roff_free1(struct roff *r)

 {
 {

-       int              i;
-
-       (void)tok;/* FIXME: quotable strings? */
-
-       assert(tok >= 0 && tok < ROFF_MAX);
-       assert('.' == *buf);
-
-       /* LINTED */
-       for (i = 0; *buf && i < ROFF_MAXARG; i++) {
-               argv[i] = buf++;
-               while (*buf && ! isspace(*buf))
-                       buf++;
-               if (0 == *buf) {
-                       continue;
-               }
-               *buf++ = 0;
-               while (*buf && isspace(*buf))
-                       buf++;
-       }
-       
-       assert(i > 0);
-       if (i < ROFF_MAXARG)
-               argv[i] = NULL;

 
 

-       return(ROFF_MAXARG > i);
+       while (r->last)
+               roffnode_pop(r);

 }
 
 
 }
 
 

-static int
-roffparse(struct rofftree *tree, char *buf, size_t sz)
+void
+roff_reset(struct roff *r)

 {
 {

-       int               tok, t;
-       struct roffnode  *node;
-       char             *argv[ROFF_MAXARG];
-       const char      **argvp;

 
 

-       assert(sz > 0);
+       roff_free1(r);
+}

 
 

-       /*
-        * Extract the token identifier from the buffer.  If there's no
-        * callback for the token (comment, etc.) then exit immediately.
-        * We don't do any error handling (yet), so if the token doesn't
-        * exist, die.
-        */

 
 

-       if (3 > sz) {
-               warnx("%s: malformed line (line %zu)", 
-                               tree->rbuf->name, 
-                               tree->rbuf->line);
-               return(0);
-       } else if (ROFF_MAX == (tok = rofffindtok(buf + 1))) {
-               warnx("%s: unknown line token `%c%c' (line %zu)",
-                               tree->rbuf->name, 
-                               *(buf + 1), *(buf + 2), 
-                               tree->rbuf->line);
-               return(0);
-       } else if (ROFF_COMMENT == tokens[tok].type) 
-               /* Ignore comment tokens. */
-               return(1);
-       
-       if ( ! roffargs(tok, buf, argv)) {
-               warnx("%s: too many arguments to `%s' (line %zu)",
-                               tree->rbuf->name, tokens[tok].name, 
-                               tree->rbuf->line);
-               return(0);
-       }
+void
+roff_free(struct roff *r)
+{

 
 

-       /* Domain cross-contamination (and sanity) checks. */
+       roff_free1(r);
+       free(r);
+}

 
 

-       switch (tokens[tok].type) {
-       case (ROFF_TITLE):
-               if (ROFF_PRELUDE & tree->state) {
-                       assert( ! (ROFF_BODY & tree->state));
-                       break;
-               }
-               assert(ROFF_BODY & tree->state);
-               warnx("%s: prelude token `%s' in body (line %zu)",
-                               tree->rbuf->name, tokens[tok].name, 
-                               tree->rbuf->line);
-               return(0);
-       case (ROFF_LAYOUT):
-               /* FALLTHROUGH */
-       case (ROFF_TEXT):
-               if (ROFF_BODY & tree->state) {
-                       assert( ! (ROFF_PRELUDE & tree->state));
-                       break;
-               }
-               assert(ROFF_PRELUDE & tree->state);
-               warnx("%s: body token `%s' in prelude (line %zu)",
-                               tree->rbuf->name, tokens[tok].name, 
-                               tree->rbuf->line);
-               return(0);
-       case (ROFF_COMMENT):
-               return(1);
-       default:
-               abort();
-       }

 
 

-       /*
-        * If this is a non-nestable layout token and we're below a
-        * token of the same type, then recurse upward to the token,
-        * closing out the interim scopes.
-        *
-        * If there's a nested token on the chain, then raise an error
-        * as nested tokens have corresponding "ending" tokens and we're
-        * breaking their scope.
-        */
+struct roff *
+roff_alloc(const mandocmsg msg, void *data)
+{
+       struct roff     *r;

 
 

-       node = NULL;
-
-       if (ROFF_LAYOUT == tokens[tok].type && 
-                       ! (ROFF_NESTED & tokens[tok].flags)) {
-               for (node = tree->last; node; node = node->parent) {
-                       if (node->tok == tok)
-                               break;
-
-                       /* Don't break nested scope. */
-
-                       if ( ! (ROFF_NESTED & tokens[node->tok].flags))
-                               continue;
-                       warnx("%s: scope of %s (line %zu) broken by "
-                                       "%s (line %zu)", 
-                                       tree->rbuf->name, 
-                                       tokens[tok].name,
-                                       node->line, 
-                                       tokens[node->tok].name,
-                                       tree->rbuf->line);
-                       return(0);
-               }
+       if (NULL == (r = calloc(1, sizeof(struct roff)))) {
+               (*msg)(MANDOCERR_MEM, data, 0, 0, NULL);
+               return(0);

        }
 
        }
 

-       if (node) {
-               assert(ROFF_LAYOUT == tokens[tok].type);
-               assert( ! (ROFF_NESTED & tokens[tok].flags));
-               assert(node->tok == tok);
+       r->msg = msg;
+       r->data = data;
+       return(r);
+}

 
 

-               /* Clear up to last scoped token. */

 
 

-               /* LINTED */
-               do {
-                       t = tree->last->tok;
-                       if ( ! (*tokens[tree->last->tok].cb)
-                                       (tree->last->tok, tree, NULL, ROFF_EXIT))
-                               return(0);
-               } while (t != tok);
+enum rofferr
+roff_parseln(struct roff *r, int ln, 
+               char **bufp, size_t *szp, int pos, int *offs)
+{
+       enum rofft       t;
+       int              ppos;
+
+       if (r->last && ! ROFF_CTL((*bufp)[pos])) {
+               if (ROFF_ig == r->last->tok)
+                       return(ROFF_IGN);
+               roffnode_cleanscope(r);
+               /* FIXME: this assumes we're discarding! */
+               return(ROFF_IGN);
+       } else if ( ! ROFF_CTL((*bufp)[pos]))
+               return(ROFF_CONT);
+
+       /* There's nothing on the stack: make us anew. */
+
+       ppos = pos;
+       if (ROFF_MAX == (t = roff_parse(*bufp, &pos))) {
+               if (r->last && ROFF_ig == r->last->tok)
+                       return(ROFF_IGN);
+               return(ROFF_CONT);

        }
 
        }
 

-       /* Proceed with actual token processing. */
-
-       argvp = (const char **)&argv[1];
-       return((*tokens[tok].cb)(tok, tree, argvp, ROFF_ENTER));
+       assert(roffs[t].proc);
+       return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));

 }
 
 
 }
 
 

-static int
-rofffindarg(const char *name)
+int
+roff_endparse(struct roff *r)

 {
 {

-       size_t           i;

 
 

-       /* FIXME: use a table, this is slow but ok for now. */
-
-       /* LINTED */
-       for (i = 0; i < ROFF_ARGMAX; i++)
-               /* LINTED */
-               if (0 == strcmp(name, tokenargs[i].name))
-                       return((int)i);
-       
-       return(ROFF_ARGMAX);
+       if (NULL == r->last)
+               return(1);
+       return((*r->msg)(MANDOCERR_SCOPEEXIT, r->data, r->last->line, 
+                               r->last->col, NULL));

 }
 
 
 }
 
 

-static int
-rofffindtok(const char *name)
+/*
+ * Parse a roff node's type from the input buffer.  This must be in the
+ * form of ".foo xxx" in the usual way.
+ */
+static enum rofft
+roff_parse(const char *buf, int *pos)

 {
 {

-       size_t           i;
-
-       /* FIXME: use a table, this is slow but ok for now. */
-
-       /* LINTED */
-       for (i = 0; i < ROFF_MAX; i++)
-               /* LINTED */
-               if (0 == strncmp(name, tokens[i].name, 2))
-                       return((int)i);
-       
-       return(ROFF_MAX);
-}
+       int              j;
+       char             mac[5];
+       enum rofft       t;

 
 

+       assert(ROFF_CTL(buf[*pos]));
+       (*pos)++;

 
 

-static int
-rofffindcallable(const char *name)
-{
-       int              c;
+       while (buf[*pos] && (' ' == buf[*pos] || '\t' == buf[*pos]))
+               (*pos)++;

 
 

-       if (ROFF_MAX == (c = rofffindtok(name)))
+       if ('\0' == buf[*pos])

                return(ROFF_MAX);
                return(ROFF_MAX);

-       return(ROFF_CALLABLE & tokens[c].flags ? c : ROFF_MAX);
-}

 
 

+       for (j = 0; j < 4; j++, (*pos)++)
+               if ('\0' == (mac[j] = buf[*pos]))
+                       break;
+               else if (' ' == buf[*pos])
+                       break;

 
 

-/* FIXME: accept only struct rofftree *. */
-static struct roffnode *
-roffnode_new(int tokid, size_t line, struct rofftree *tree)
-{
-       struct roffnode *p;
-       
-       if (NULL == (p = malloc(sizeof(struct roffnode)))) {
-               warn("malloc");
-               return(NULL);
-       }
-
-       p->line = line;
-       p->tok = tokid;
-       p->parent = tree->last;
-       tree->last = p;
-       return(p);
-}
+       if (j == 4 || j < 1)
+               return(ROFF_MAX);

 
 

+       mac[j] = '\0';

 
 

-static void
-roffnode_free(int tokid, struct rofftree *tree)
-{
-       struct roffnode *p;
+       if (ROFF_MAX == (t = roff_hash_find(mac)))
+               return(t);

 
 

-       assert(tree->last);
-       assert(tree->last->tok == tokid);
+       while (buf[*pos] && ' ' == buf[*pos])
+               (*pos)++;

 
 

-       p = tree->last;
-       tree->last = tree->last->parent;
-       free(p);
+       return(t);

 }
 
 
 }
 
 

-/* FIXME: accept only struct rofftree *. */

 /* ARGSUSED */
 /* ARGSUSED */

-static int
-roff_Dd(ROFFCALL_ARGS)
+static enum rofferr
+roff_cblock(ROFF_ARGS)

 {
 
 {
 

-       assert(ROFF_PRELUDE & tree->state);
-       if (ROFF_PRELUDE_Dt & tree->state ||
-                       ROFF_PRELUDE_Dd & tree->state) {
-               warnx("%s: prelude `Dd' out-of-order (line %zu)",
-                               tree->rbuf->name, tree->rbuf->line);
-               return(0);
+       if (NULL == r->last) {
+               if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
+                       return(ROFF_ERR);
+               return(ROFF_IGN);

        }
 
        }
 

-       assert(NULL == tree->last);
-       tree->state |= ROFF_PRELUDE_Dd;
+       if (ROFF_ig != r->last->tok) {
+               if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
+                       return(ROFF_ERR);
+               return(ROFF_IGN);
+       }
+
+       if ((*bufp)[pos])
+               if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
+                       return(ROFF_ERR);
+
+       ROFF_MDEBUG(r, "closing ignore block");
+       roffnode_pop(r);
+       roffnode_cleanscope(r);
+       return(ROFF_IGN);

 
 

-       return(1);

 }
 
 
 }
 
 

-/* ARGSUSED */
-static int
-roff_Dt(ROFFCALL_ARGS)
+static void
+roffnode_cleanscope(struct roff *r)

 {
 
 {
 

-       assert(ROFF_PRELUDE & tree->state);
-       if ( ! (ROFF_PRELUDE_Dd & tree->state) ||
-                       (ROFF_PRELUDE_Dt & tree->state)) {
-               warnx("%s: prelude `Dt' out-of-order (line %zu)",
-                               tree->rbuf->name, tree->rbuf->line);
-               return(0);
+       while (r->last) {
+               if (--r->last->endspan < 0)
+                       break;
+               ROFF_MDEBUG(r, "closing implicit scope");
+               roffnode_pop(r);

        }
        }

-
-       assert(NULL == tree->last);
-       tree->state |= ROFF_PRELUDE_Dt;
-
-       return(1);

 }
 
 
 /* ARGSUSED */
 }
 
 
 /* ARGSUSED */

-static int
-roff_Os(ROFFCALL_ARGS)
+static enum rofferr
+roff_ccond(ROFF_ARGS)

 {
 
 {
 

-       if (ROFF_EXIT == type) {
-               roffnode_free(ROFF_Os, tree);
-               return(1);
-       } 
+       if (NULL == r->last) {
+               if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
+                       return(ROFF_ERR);
+               return(ROFF_IGN);
+       }

 
 

-       assert(ROFF_PRELUDE & tree->state);
-       if ( ! (ROFF_PRELUDE_Dt & tree->state) ||
-                       ! (ROFF_PRELUDE_Dd & tree->state)) {
-               warnx("%s: prelude `Os' out-of-order (line %zu)",
-                               tree->rbuf->name, tree->rbuf->line);
-               return(0);
+       if (ROFF_if != r->last->tok) {
+               if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
+                       return(ROFF_ERR);
+               return(ROFF_IGN);

        }
 
        }
 

-       assert(NULL == tree->last);
-       if (NULL == roffnode_new(ROFF_Os, tree->rbuf->line, tree))
-               return(0);
+       if (r->last->endspan > -1) {
+               if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
+                       return(ROFF_ERR);
+               return(ROFF_IGN);
+       }

 
 

-       tree->state |= ROFF_PRELUDE_Os;
-       tree->state &= ~ROFF_PRELUDE;
-       tree->state |= ROFF_BODY;
+       if ((*bufp)[pos])
+               if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
+                       return(ROFF_ERR);

 
 

-       return(1);
+       ROFF_MDEBUG(r, "closing explicit scope");
+       roffnode_pop(r);
+       roffnode_cleanscope(r);
+       return(ROFF_IGN);

 }
 
 
 }
 
 

-/* ARGUSED */
-static int
-roffnextopt(const char ***in, char **val)
+/* ARGSUSED */
+static enum rofferr
+roff_ig(ROFF_ARGS)

 {
 {

-       const char      *arg, **argv;
-       int              v;
-
-       *val = NULL;
-       argv = *in;
-       assert(argv);

 
 

-       if (NULL == (arg = *argv))
-               return(-1);
-       if ('-' != *arg)
-               return(-1);
-       if (ROFF_ARGMAX == (v = rofffindarg(&arg[1])))
-               return(-1);
-       if ( ! (ROFF_VALUE & tokenargs[v].flags))
-               return(v);
+       if ( ! roffnode_push(r, tok, ln, ppos))
+               return(ROFF_ERR);

 
 

-       *in = ++argv;
+       ROFF_MDEBUG(r, "opening ignore block");

 
 

-       /* FIXME: what if this looks like a roff token or argument? */
+       /* FIXME: warn about end of line. */

 
 

-       return(*argv ? v : ROFF_ARGMAX);
+       return(ROFF_IGN);

 }
 
 
 /* ARGSUSED */
 }
 
 
 /* ARGSUSED */

-static int
-roff_layout(ROFFCALL_ARGS) 
+static enum rofferr
+roff_if(ROFF_ARGS)

 {
 {

-       int              i, c, argcp[ROFF_MAXARG];
-       char            *v, *argvp[ROFF_MAXARG];
-
-       if (ROFF_EXIT == type) {
-               roffnode_free(tok, tree);
-               return((*tree->roffblkout[tok])(tok));
-       } 
-
-       i = 0;
-       while (-1 != (c = roffnextopt(&argv, &v))) {
-               if (ROFF_ARGMAX == c) {
-                       warnx("%s: error parsing `%s' args (line %zu)", 
-                                       tree->rbuf->name, 
-                                       tokens[tok].name,
-                                       tree->rbuf->line);
-                       return(0);
-               }
-               argcp[i] = c;
-               argvp[i] = v;
-               argv++;
-       }
-
-       if (NULL == roffnode_new(tok, tree->rbuf->line, tree))
-               return(0);
-
-       if ( ! (*tree->roffin[tok])(tok, argcp, argvp))
-               return(0);
-
-       if ( ! (ROFF_PARSED & tokens[tok].flags)) {
-               /* TODO: print all tokens. */

 
 

-               if ( ! ((*tree->roffout[tok])(tok)))
-                       return(0);
-               return((*tree->roffblkin[tok])(tok));
-       }
-
-       while (*argv) {
-               if (2 >= strlen(*argv) && ROFF_MAX != 
-                               (c = rofffindcallable(*argv)))
-                       if ( ! (*tokens[c].cb)(c, tree, 
-                                               argv + 1, ROFF_ENTER))
-                               return(0);
-
-               /* TODO: print token. */
-               argv++;
-       }
-
-       if ( ! ((*tree->roffout[tok])(tok)))
-               return(0);
-
-       return((*tree->roffblkin[tok])(tok));
-}
+       /*
+        * Read ahead past the conditional.
+        * FIXME: this does not work, as conditionals don't end on
+        * whitespace, but are parsed according to a formal grammar.
+        * It's good enough for now, however.
+        */

 
 

+       if ( ! roffnode_push(r, tok, ln, ppos))
+               return(ROFF_ERR);

 
 

-/* ARGSUSED */
-static int
-roff_text(ROFFCALL_ARGS) 
-{
-       int              i, c, argcp[ROFF_MAXARG];
-       char            *v, *argvp[ROFF_MAXARG];
-
-       i = 0;
-       while (-1 != (c = roffnextopt(&argv, &v))) {
-               if (ROFF_ARGMAX == c) {
-                       warnx("%s: error parsing `%s' args (line %zu)", 
-                                       tree->rbuf->name, 
-                                       tokens[tok].name,
-                                       tree->rbuf->line);
-                       return(0);
-               }
-               argcp[i] = c;
-               argvp[i] = v;
-               argv++;
-       }
+       while ((*bufp)[pos] && ' ' != (*bufp)[pos])
+               pos++;
+       while (' ' == (*bufp)[pos])
+               pos++;

 
 

-       if ( ! (*tree->roffin[tok])(tok, argcp, argvp))
-               return(0);
+       /* Don't evaluate: just assume NO. */

 
 

-       if ( ! (ROFF_PARSED & tokens[tok].flags)) {
-               /* TODO: print all tokens. */
-               return((*tree->roffout[tok])(tok));
-       }
+       r->last->endspan = 1;

 
 

-       while (*argv) {
-               if (2 >= strlen(*argv) && ROFF_MAX != 
-                               (c = rofffindcallable(*argv)))
-                       if ( ! (*tokens[c].cb)(c, tree, 
-                                               argv + 1, ROFF_ENTER))
-                               return(0);
+       if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
+               ROFF_MDEBUG(r, "opening explicit scope");
+               r->last->endspan = -1;
+               pos += 2;
+       } else
+               ROFF_MDEBUG(r, "opening implicit scope");

 
 

-               /* TODO: print token. */
-               argv++;
-       }
+       if ('\0' == (*bufp)[pos])
+               return(ROFF_IGN);

 
 

-       return((*tree->roffout[tok])(tok));
+       *offs = pos;
+       return(ROFF_RERUN);

 }
 }