Moved prologue-pruning into action.c.

[mandoc.git] / validate.c

diff --git a/validate.c b/validate.c
index 7eb584dd661e2d6657e332a10395b447e4291be6..b68e6ad9013e8c1bf139e7ec3c6bb7dd90b458e3 100644 (file)
--- a/validate.c
+++ b/validate.c
@@ -1,4 +1,4 @@
-/* $Id: validate.c,v 1.6 2008/11/30 20:53:34 kristaps Exp $ */
+/* $Id: validate.c,v 1.43 2009/01/20 12:51:28 kristaps Exp $ */

 /*
  * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
  *
 /*
  * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
  *


@@ -16,455 +16,1113 @@
  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  * PERFORMANCE OF THIS SOFTWARE.
  */
  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  * PERFORMANCE OF THIS SOFTWARE.
  */

-#include <sys/param.h>
-

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

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

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

-#include <string.h>

 
 

-#include "libmdocml.h"

 #include "private.h"
 
 #include "private.h"
 

-#define        INDENT           4
-#define        COLUMNS          72
+typedef        int     (*v_pre)(struct mdoc *, struct mdoc_node *);
+typedef        int     (*v_post)(struct mdoc *);

 
 

-#ifdef __linux__ /* FIXME */
-#define        strlcat          strncat
-#endif
+/* FIXME: some sections should only occur in specific msecs. */
+/* FIXME: ignoring Pp. */
+/* FIXME: math symbols. */
+/* FIXME: valid character-escape checks. */
+/* FIXME: make sure required sections are included (NAME, ...). */

 
 

-enum   md_tok {
-       MD_BLKIN,
-       MD_BLKOUT,
-       MD_IN,
-       MD_OUT,
-       MD_TEXT
+struct valids {
+       v_pre   *pre;
+       v_post  *post;

 };
 
 };
 

-struct md_valid {
-       const struct md_args    *args;
-       const struct md_rbuf    *rbuf;
-
-       struct md_mbuf  *mbuf;
-       struct rofftree *tree;
-       size_t           indent;
-       size_t           pos;
-       enum md_tok      last;
-       int              flags;
-#define        MD_LITERAL      (1 << 0) /* FIXME */
+/* Utility checks. */
+
+static int     pre_check_parent(struct mdoc *, struct mdoc_node *, 
+                       int, enum mdoc_type);
+static int     pre_check_msecs(struct mdoc *, struct mdoc_node *, 
+                       int, enum mdoc_msec *);
+static int     pre_check_stdarg(struct mdoc *, struct mdoc_node *);
+static int     post_check_children_count(struct mdoc *);
+static int     post_check_children_lt(struct mdoc *, const char *, int);
+static int     post_check_children_gt(struct mdoc *, const char *, int);
+static int     post_check_children_wgt(struct mdoc *, const char *, int);
+static int     post_check_children_eq(struct mdoc *, const char *, int);
+static int     post_check_children_weq(struct mdoc *, const char *, int);
+
+/* Specific pre-child-parse routines. */
+
+static int     pre_display(struct mdoc *, struct mdoc_node *);
+static int     pre_sh(struct mdoc *, struct mdoc_node *);
+static int     pre_ss(struct mdoc *, struct mdoc_node *);
+static int     pre_bd(struct mdoc *, struct mdoc_node *);
+static int     pre_bl(struct mdoc *, struct mdoc_node *);
+static int     pre_it(struct mdoc *, struct mdoc_node *);
+static int     pre_cd(struct mdoc *, struct mdoc_node *);
+static int     pre_er(struct mdoc *, struct mdoc_node *);
+static int     pre_ex(struct mdoc *, struct mdoc_node *);
+static int     pre_rv(struct mdoc *, struct mdoc_node *);
+static int     pre_an(struct mdoc *, struct mdoc_node *);
+static int     pre_st(struct mdoc *, struct mdoc_node *);
+static int     pre_prologue(struct mdoc *, struct mdoc_node *);
+static int     pre_prologue(struct mdoc *, struct mdoc_node *);
+static int     pre_prologue(struct mdoc *, struct mdoc_node *);
+
+/* Specific post-child-parse routines. */
+
+static int     herr_ge1(struct mdoc *);
+static int     herr_le1(struct mdoc *);
+static int     herr_eq0(struct mdoc *);
+static int     eerr_eq0(struct mdoc *);
+static int     eerr_le1(struct mdoc *);
+static int     eerr_le2(struct mdoc *);
+static int     eerr_eq1(struct mdoc *);
+static int     eerr_ge1(struct mdoc *);
+static int     ewarn_eq0(struct mdoc *);
+static int     ewarn_eq1(struct mdoc *);
+static int     bwarn_ge1(struct mdoc *);
+static int     ewarn_ge1(struct mdoc *);
+static int     ebool(struct mdoc *);
+static int     post_sh(struct mdoc *);
+static int     post_bl(struct mdoc *);
+static int     post_it(struct mdoc *);
+static int     post_ex(struct mdoc *);
+static int     post_an(struct mdoc *);
+static int     post_at(struct mdoc *);
+static int     post_xr(struct mdoc *);
+static int     post_nm(struct mdoc *);
+static int     post_bf(struct mdoc *);
+static int     post_root(struct mdoc *);
+
+/* Collections of pre-child-parse routines. */
+
+static v_pre   pres_prologue[] = { pre_prologue, NULL };
+static v_pre   pres_d1[] = { pre_display, NULL };
+static v_pre   pres_bd[] = { pre_display, pre_bd, NULL };
+static v_pre   pres_bl[] = { pre_bl, NULL };
+static v_pre   pres_it[] = { pre_it, NULL };
+static v_pre   pres_ss[] = { pre_ss, NULL };
+static v_pre   pres_sh[] = { pre_sh, NULL };
+static v_pre   pres_cd[] = { pre_cd, NULL };
+static v_pre   pres_er[] = { pre_er, NULL };
+static v_pre   pres_ex[] = { pre_ex, NULL };
+static v_pre   pres_rv[] = { pre_rv, NULL };
+static v_pre   pres_an[] = { pre_an, NULL };
+static v_pre   pres_st[] = { pre_st, NULL };
+
+/* Collections of post-child-parse routines. */
+
+static v_post  posts_bool[] = { eerr_eq1, ebool, NULL };
+static v_post  posts_bd[] = { herr_eq0, bwarn_ge1, NULL };
+static v_post  posts_text[] = { eerr_ge1, NULL };
+static v_post  posts_wtext[] = { ewarn_ge1, NULL };
+static v_post  posts_notext[] = { eerr_eq0, NULL };
+static v_post  posts_wline[] = { bwarn_ge1, herr_eq0, NULL };
+static v_post  posts_sh[] = { herr_ge1, bwarn_ge1, post_sh, NULL };
+static v_post  posts_bl[] = { herr_eq0, bwarn_ge1, post_bl, NULL };
+static v_post  posts_it[] = { post_it, NULL };
+static v_post  posts_in[] = { ewarn_eq1, NULL };
+static v_post  posts_ss[] = { herr_ge1, NULL };
+static v_post  posts_pp[] = { ewarn_eq0, NULL };
+static v_post  posts_ex[] = { eerr_le1, post_ex, NULL };
+static v_post  posts_an[] = { post_an, NULL };
+static v_post  posts_at[] = { post_at, NULL };
+static v_post  posts_xr[] = { eerr_ge1, eerr_le2, post_xr, NULL };
+static v_post  posts_nm[] = { post_nm, NULL };
+static v_post  posts_bf[] = { herr_le1, post_bf, NULL };
+
+/* Per-macro pre- and post-child-check routine collections. */
+
+const  struct valids mdoc_valids[MDOC_MAX] = {
+       { NULL, NULL }, /* \" */
+       { pres_prologue, posts_text }, /* Dd */
+       { pres_prologue, NULL }, /* Dt */
+       { pres_prologue, NULL }, /* Os */
+       /* FIXME: NAME section internal ordering. */
+       { pres_sh, posts_sh }, /* Sh */ 
+       { pres_ss, posts_ss }, /* Ss */ 
+       { NULL, posts_pp }, /* Pp */ 
+       { pres_d1, posts_wline }, /* D1 */
+       { pres_d1, posts_wline }, /* Dl */
+       { pres_bd, posts_bd }, /* Bd */
+       { NULL, NULL }, /* Ed */
+       { pres_bl, posts_bl }, /* Bl */ 
+       { NULL, NULL }, /* El */
+       { pres_it, posts_it }, /* It */
+       { NULL, posts_text }, /* Ad */ 
+       { pres_an, posts_an }, /* An */ 
+       { NULL, NULL }, /* Ar */
+       { pres_cd, posts_text }, /* Cd */ 
+       { NULL, NULL }, /* Cm */
+       { NULL, posts_text }, /* Dv */ 
+       { pres_er, posts_text }, /* Er */ 
+       { NULL, posts_text }, /* Ev */ 
+       { pres_ex, posts_ex }, /* Ex */ 
+       { NULL, posts_text }, /* Fa */ 
+       /* FIXME: only in SYNOPSIS section. */
+       { NULL, posts_wtext }, /* Fd */
+       { NULL, NULL }, /* Fl */
+       { NULL, posts_text }, /* Fn */ 
+       { NULL, posts_wtext }, /* Ft */ 
+       { NULL, posts_text }, /* Ic */ 
+       { NULL, posts_in }, /* In */ 
+       { NULL, posts_text }, /* Li */
+       { NULL, posts_wtext }, /* Nd */
+       { NULL, posts_nm }, /* Nm */
+       { NULL, posts_wline }, /* Op */
+       { NULL, NULL }, /* Ot */
+       { NULL, NULL }, /* Pa */
+       { pres_rv, posts_notext }, /* Rv */
+       { pres_st, posts_notext }, /* St */ 
+       { NULL, posts_text }, /* Va */
+       { NULL, posts_text }, /* Vt */ 
+       { NULL, posts_xr }, /* Xr */ 
+       { NULL, posts_text }, /* %A */
+       { NULL, posts_text }, /* %B */
+       { NULL, posts_text }, /* %D */
+       { NULL, posts_text }, /* %I */
+       { NULL, posts_text }, /* %J */
+       { NULL, posts_text }, /* %N */
+       { NULL, posts_text }, /* %O */
+       { NULL, posts_text }, /* %P */
+       { NULL, posts_text }, /* %R */
+       { NULL, posts_text }, /* %T */
+       { NULL, posts_text }, /* %V */
+       { NULL, NULL }, /* Ac */
+       { NULL, NULL }, /* Ao */
+       { NULL, posts_wline }, /* Aq */
+       { NULL, posts_at }, /* At */ 
+       { NULL, NULL }, /* Bc */
+       { NULL, posts_bf }, /* Bf */
+       { NULL, NULL }, /* Bo */
+       { NULL, posts_wline }, /* Bq */
+       { NULL, NULL }, /* Bsx */
+       { NULL, NULL }, /* Bx */
+       { NULL, posts_bool }, /* Db */
+       { NULL, NULL }, /* Dc */
+       { NULL, NULL }, /* Do */
+       { NULL, posts_wline }, /* Dq */
+       { NULL, NULL }, /* Ec */
+       { NULL, NULL }, /* Ef */ /* -symbolic, etc. */
+       { NULL, posts_text }, /* Em */ 
+       { NULL, NULL }, /* Eo */
+       { NULL, NULL }, /* Fx */
+       { NULL, posts_text }, /* Ms */ 
+       { NULL, posts_notext }, /* No */
+       { NULL, posts_notext }, /* Ns */
+       { NULL, NULL }, /* Nx */
+       { NULL, NULL }, /* Ox */
+       { NULL, NULL }, /* Pc */
+       { NULL, NULL }, /* Pf */
+       { NULL, NULL }, /* Po */
+       { NULL, posts_wline }, /* Pq */
+       { NULL, NULL }, /* Qc */
+       { NULL, posts_wline }, /* Ql */
+       { NULL, NULL }, /* Qo */
+       { NULL, posts_wline }, /* Qq */
+       { NULL, NULL }, /* Re */
+       { NULL, NULL }, /* Rs */
+       { NULL, NULL }, /* Sc */
+       { NULL, NULL }, /* So */
+       { NULL, posts_wline }, /* Sq */
+       { NULL, posts_bool }, /* Sm */ 
+       { NULL, posts_text }, /* Sx */
+       { NULL, posts_text }, /* Sy */
+       { NULL, posts_text }, /* Tn */
+       { NULL, NULL }, /* Ux */
+       { NULL, NULL }, /* Xc */
+       { NULL, NULL }, /* Xo */
+       { NULL, NULL }, /* Fo */ 
+       { NULL, NULL }, /* Fc */ 
+       { NULL, NULL }, /* Oo */
+       { NULL, NULL }, /* Oc */
+       { NULL, NULL }, /* Bk */
+       { NULL, NULL }, /* Ek */
+       { NULL, posts_notext }, /* Bt */
+       { NULL, NULL }, /* Hf */
+       { NULL, NULL }, /* Fr */
+       { NULL, posts_notext }, /* Ud */

 };
 
 };
 

-static void             roffmsg(void *arg, enum roffmsg, 
-                               const char *, const char *, char *);
-static int              roffhead(void *);
-static int              rofftail(void *);
-static int              roffin(void *, int, int, int *, char **);
-static int              roffdata(void *, int, char *);
-static int              roffout(void *, int);
-static int              roffblkin(void *, int, int *, char **);
-static int              roffblkout(void *, int);
-static int              roffspecial(void *, int);

 
 

-static int              mbuf_newline(struct md_valid *);
-static int              mbuf_indent(struct md_valid *);
-static int              mbuf_data(struct md_valid *, int, char *);
-static int              mbuf_putstring(struct md_valid *, 
-                               const char *);
-static int              mbuf_nputstring(struct md_valid *, 
-                               const char *, size_t);
+static int
+post_check_children_count(struct mdoc *mdoc)
+{
+       struct mdoc_node *n;
+       int               i;
+
+       for (i = 0, n = mdoc->last->child; n; n = n->next, i++)
+               /* Do nothing */ ;
+       return(i);
+}

 
 
 static int
 
 
 static int

-mbuf_putstring(struct md_valid *p, const char *buf)
+post_check_children_wgt(struct mdoc *mdoc, const char *p, int sz)

 {
 {

+       int               i;

 
 

-       return(mbuf_nputstring(p, buf, strlen(buf)));
+       if ((i = post_check_children_count(mdoc)) > sz)
+               return(1);
+       return(mdoc_warn(mdoc, WARN_SYNTAX, "macro suggests more "
+                               "than %d %s (has %d)", sz, p, i));

 }
 
 
 static int
 }
 
 
 static int

-mbuf_nputstring(struct md_valid *p, const char *buf, size_t sz)
+post_check_children_gt(struct mdoc *mdoc, const char *p, int sz)

 {
 {

+       int               i;

 
 

-       p->pos += sz;
-       return(md_buf_puts(p->mbuf, buf, sz));
+       if ((i = post_check_children_count(mdoc)) > sz)
+               return(1);
+       return(mdoc_err(mdoc, "macro requires more than %d "
+                               "%s (has %d)", sz, p, i));

 }
 
 
 static int
 }
 
 
 static int

-mbuf_indent(struct md_valid *p)
+post_check_children_weq(struct mdoc *mdoc, const char *p, int sz)

 {
 {

-       size_t           i;
+       int               i;

 
 

-       assert(p->pos == 0);
+       if ((i = post_check_children_count(mdoc)) == sz)
+               return(1);
+       return(mdoc_warn(mdoc, WARN_SYNTAX, "macro suggests %d "
+                               "%s (has %d)", sz, p, i));
+}

 
 

-       /* LINTED */
-       for (i = 0; i < MIN(p->indent, INDENT); i++)
-               if ( ! md_buf_putstring(p->mbuf, "    "))
-                       return(0);

 
 

-       p->pos += i * INDENT;
-       return(1);
+static int
+post_check_children_eq(struct mdoc *mdoc, const char *p, int sz)
+{
+       int               i;
+
+       if ((i = post_check_children_count(mdoc)) == sz)
+               return(1);
+       return(mdoc_err(mdoc, "macro requires %d %s "
+                               "(have %d)", sz, p, i));

 }
 
 
 static int
 }
 
 
 static int

-mbuf_newline(struct md_valid *p)
+post_check_children_lt(struct mdoc *mdoc, const char *p, int sz)

 {
 {

+       int               i;

 
 

-       if ( ! md_buf_putchar(p->mbuf, '\n'))
-               return(0);
+       if ((i = post_check_children_count(mdoc)) < sz)
+               return(1);
+       return(mdoc_err(mdoc, "macro requires less than %d "
+                               "%s (have %d)", sz, p, i));
+}
+
+
+static int
+pre_check_stdarg(struct mdoc *mdoc, struct mdoc_node *node)
+{

 
 

-       p->pos = 0;
+       if (1 == node->data.elem.argc &&
+                       MDOC_Std == node->data.elem.argv[0].arg)
+               return(1);
+       return(mdoc_nwarn(mdoc, node, WARN_COMPAT, 
+                               "macro suggests single `%s' argument",
+                               mdoc_argnames[MDOC_Std]));
+}
+
+
+static int
+pre_check_msecs(struct mdoc *mdoc, struct mdoc_node *node, 
+               int sz, enum mdoc_msec *msecs)
+{
+       int              i;
+
+       for (i = 0; i < sz; i++)
+               if (msecs[i] == mdoc->meta.msec)
+                       return(1);
+       return(mdoc_nwarn(mdoc, node, WARN_COMPAT, "macro not "
+                               "appropriate for manual section"));
+}
+
+
+static int
+pre_check_parent(struct mdoc *mdoc, struct mdoc_node *node, 
+               int tok, enum mdoc_type type)
+{
+
+       if (type != node->parent->type) 
+               return(mdoc_nerr(mdoc, node, "invalid macro parent class %s, expected %s", 
+                                       mdoc_type2a(node->parent->type),
+                                       mdoc_type2a(type)));
+       if (MDOC_ROOT != type && tok != node->parent->tok)
+               return(mdoc_nerr(mdoc, node, "invalid macro parent `%s', expected `%s'", 
+                                       mdoc_macronames[node->parent->tok],
+                                       mdoc_macronames[tok]));

        return(1);
 }
 
 
 static int
        return(1);
 }
 
 
 static int

-mbuf_data(struct md_valid *p, int space, char *buf)
+bwarn_ge1(struct mdoc *mdoc)

 {
 {

-       size_t           sz;
-       char            *bufp;

 
 

-       assert(p->mbuf);
-       assert(0 != p->indent);
+       if (MDOC_BODY != mdoc->last->type)
+               return(1);
+       return(post_check_children_wgt(mdoc, "body children", 0));
+}

 
 

-       /* 
-        * FIXME: punctuation/no-space stuff shouldn't have a newline
-        * before it.
-        */

 
 

-       if (MD_LITERAL & p->flags)
-               return(mbuf_putstring(p, buf));
+static int
+ewarn_eq1(struct mdoc *mdoc)
+{

 
 

-       while (*buf) {
-               while (*buf && isspace(*buf))
-                       buf++;
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_weq(mdoc, "parameters", 1));
+}

 
 

-               if (0 == *buf)
-                       break;

 
 

-               bufp = buf;
-               while (*buf && ! isspace(*buf))
-                       buf++;
+static int
+ewarn_eq0(struct mdoc *mdoc)
+{

 
 

-               if (0 != *buf)
-                       *buf++ = 0;
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_weq(mdoc, "parameters", 0));
+}

 
 

-               sz = strlen(bufp);

 
 

-               if (0 == p->pos) {
-                       if ( ! mbuf_indent(p))
-                               return(0);
-                       if ( ! mbuf_nputstring(p, bufp, sz))
-                               return(0);
-                       if (p->indent * INDENT + sz >= COLUMNS) {
-                               if ( ! mbuf_newline(p))
-                                       return(0);
-                               continue;
-                       }
-                       continue;
-               }
+static int
+ewarn_ge1(struct mdoc *mdoc)
+{

 
 

-               if (sz + p->pos >= COLUMNS) {
-                       if ( ! mbuf_newline(p))
-                               return(0);
-                       if ( ! mbuf_indent(p))
-                               return(0);
-               } else if (space) 
-                       if ( ! mbuf_nputstring(p, " ", 1))
-                               return(0);
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_wgt(mdoc, "parameters", 0));
+}

 
 

-               if ( ! mbuf_nputstring(p, bufp, sz))
-                       return(0);
-       }

 
 

-       return(1);
+static int
+eerr_eq1(struct mdoc *mdoc)
+{
+
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_eq(mdoc, "parameters", 1));

 }
 
 
 }
 
 

-int
-md_line_valid(void *arg, char *buf)
+static int
+eerr_le2(struct mdoc *mdoc)

 {
 {

-       struct md_valid *p;

 
 

-       p = (struct md_valid *)arg;
-       return(roff_engine(p->tree, buf));
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_lt(mdoc, "parameters", 3));

 }
 
 
 }
 
 

-int
-md_exit_valid(void *data, int flush)
+static int
+eerr_le1(struct mdoc *mdoc)

 {
 {

-       int              c;
-       struct md_valid *p;

 
 

-       p = (struct md_valid *)data;
-       c = roff_free(p->tree, flush);
-       free(p);
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_lt(mdoc, "parameters", 2));
+}
+
+
+static int
+eerr_eq0(struct mdoc *mdoc)
+{

 
 

-       return(c);
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_eq(mdoc, "parameters", 0));

 }
 
 
 }
 
 

-void *
-md_init_valid(const struct md_args *args,
-               struct md_mbuf *mbuf, const struct md_rbuf *rbuf)
+static int
+eerr_ge1(struct mdoc *mdoc)

 {
 {

-       struct roffcb    cb;
-       struct md_valid *p;

 
 

-       cb.roffhead = roffhead;
-       cb.rofftail = rofftail;
-       cb.roffin = roffin;
-       cb.roffout = roffout;
-       cb.roffblkin = roffblkin;
-       cb.roffblkout = roffblkout;
-       cb.roffspecial = roffspecial;
-       cb.roffmsg = roffmsg;
-       cb.roffdata = roffdata;
+       assert(MDOC_ELEM == mdoc->last->type);
+       return(post_check_children_gt(mdoc, "parameters", 0));
+}

 
 

-       if (NULL == (p = calloc(1, sizeof(struct md_valid))))
-               err(1, "malloc");

 
 

-       p->args = args;
-       p->mbuf = mbuf;
-       p->rbuf = rbuf;
+static int
+herr_eq0(struct mdoc *mdoc)
+{
+
+       if (MDOC_HEAD != mdoc->last->type)
+               return(1);
+       return(post_check_children_eq(mdoc, "parameters", 0));
+}

 
 

-       assert(mbuf);

 
 

-       if (NULL == (p->tree = roff_alloc(&cb, p))) {
-               free(p);
-               return(NULL);
+static int
+herr_le1(struct mdoc *mdoc)
+{
+       if (MDOC_HEAD != mdoc->last->type)
+               return(1);
+       return(post_check_children_lt(mdoc, "parameters", 2));
+}
+
+
+static int
+herr_ge1(struct mdoc *mdoc)
+{
+
+       if (MDOC_HEAD != mdoc->last->type)
+               return(1);
+       return(post_check_children_gt(mdoc, "parameters", 0));
+}
+
+
+static int
+pre_display(struct mdoc *mdoc, struct mdoc_node *node)
+{
+       struct mdoc_node *n;
+
+       if (MDOC_BLOCK != node->type)
+               return(1);
+
+       assert(mdoc->last);
+       /* LINTED */
+       for (n = mdoc->last->parent; n; n = n->parent) 
+               if (MDOC_BLOCK == n->type)
+                       if (MDOC_Bd == n->tok)
+                               break;
+       if (NULL == n)
+               return(1);
+       return(mdoc_nerr(mdoc, node, "displays may not be nested"));
+}
+
+
+static int
+pre_bl(struct mdoc *mdoc, struct mdoc_node *node)
+{
+       int              type, err;
+       struct mdoc_arg *argv;
+       size_t           i, argc;
+
+       if (MDOC_BLOCK != node->type)
+               return(1);
+       assert(MDOC_Bl == node->tok);
+
+       argv = NULL;
+       argc = node->data.block.argc; 
+
+       /* LINTED */
+       for (i = type = err = 0; i < argc; i++) {
+               argv = &node->data.block.argv[(int)i];
+               assert(argv);
+               switch (argv->arg) {
+               case (MDOC_Bullet):
+                       /* FALLTHROUGH */
+               case (MDOC_Dash):
+                       /* FALLTHROUGH */
+               case (MDOC_Enum):
+                       /* FALLTHROUGH */
+               case (MDOC_Hyphen):
+                       /* FALLTHROUGH */
+               case (MDOC_Item):
+                       /* FALLTHROUGH */
+               case (MDOC_Tag):
+                       /* FALLTHROUGH */
+               case (MDOC_Diag):
+                       /* FALLTHROUGH */
+               case (MDOC_Hang):
+                       /* FALLTHROUGH */
+               case (MDOC_Ohang):
+                       /* FALLTHROUGH */
+               case (MDOC_Inset):
+                       /* FALLTHROUGH */
+               case (MDOC_Column):
+                       if (type)
+                               err++;
+                       type++;
+                       break;
+               default:
+                       break;
+               }

        }
        }

+       if (0 == type)
+               return(mdoc_err(mdoc, "no list type specified"));
+       if (0 == err)
+               return(1);
+       assert(argv);
+       return(mdoc_perr(mdoc, argv->line, 
+                       argv->pos, "only one list type possible"));
+}
+
+
+static int
+pre_bd(struct mdoc *mdoc, struct mdoc_node *node)
+{
+       int              type, err;
+       struct mdoc_arg *argv;
+       size_t           i, argc;

 
 

-       return(p);
+       if (MDOC_BLOCK != node->type)
+               return(1);
+       assert(MDOC_Bd == node->tok);
+
+       argv = NULL;
+       argc = node->data.block.argc;
+
+       /* LINTED */
+       for (err = i = type = 0; 0 == err && i < argc; i++) {
+               argv = &node->data.block.argv[(int)i];
+               assert(argv);
+               switch (argv->arg) {
+               case (MDOC_Ragged):
+                       /* FALLTHROUGH */
+               case (MDOC_Unfilled):
+                       /* FALLTHROUGH */
+               case (MDOC_Filled):
+                       /* FALLTHROUGH */
+               case (MDOC_Literal):
+                       /* FALLTHROUGH */
+               case (MDOC_File):
+                       if (type)
+                               err++;
+                       type++;
+                       break;
+               default:
+                       break;
+               }
+       }
+       if (0 == type)
+               return(mdoc_err(mdoc, "no display type specified"));
+       if (0 == err)
+               return(1);
+       assert(argv);
+       return(mdoc_perr(mdoc, argv->line, 
+                       argv->pos, "only one display type possible"));

 }
 
 
 }
 
 

-/* ARGSUSED */

 static int
 static int

-roffhead(void *arg)
+pre_ss(struct mdoc *mdoc, struct mdoc_node *node)

 {
 {

-       struct md_valid *p;

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;
+       if (MDOC_BLOCK != node->type)
+               return(1);
+       return(pre_check_parent(mdoc, node, MDOC_Sh, MDOC_BODY));
+}

 
 

-       if ( ! mbuf_putstring(p, "<?xml version=\"1.0\" "
-                               "encoding=\"UTF-8\"?>\n"))
-               return(0);
-       if ( ! mbuf_nputstring(p, "<mdoc>", 6))
-               return(0);

 
 

-       p->indent++;
-       return(mbuf_newline(p));
+static int
+pre_sh(struct mdoc *mdoc, struct mdoc_node *node)
+{
+
+       if (MDOC_BLOCK != node->type)
+               return(1);
+       return(pre_check_parent(mdoc, node, -1, MDOC_ROOT));

 }
 
 
 static int
 }
 
 
 static int

-rofftail(void *arg)
+pre_st(struct mdoc *mdoc, struct mdoc_node *node)

 {
 {

-       struct md_valid *p;

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;
+       assert(MDOC_ELEM == node->type);
+       assert(MDOC_St == node->tok);
+       if (1 == node->data.elem.argc)
+               return(1);
+       return(mdoc_nerr(mdoc, node, "macro must have one argument"));
+}
+
+
+static int
+pre_an(struct mdoc *mdoc, struct mdoc_node *node)
+{

 
 

-       if (0 != p->pos && ! mbuf_newline(p))
+       assert(MDOC_ELEM == node->type);
+       assert(MDOC_An == node->tok);
+       if (1 >= node->data.elem.argc)
+               return(1);
+       return(mdoc_nerr(mdoc, node, "macro may only have one argument"));
+}
+
+
+static int
+pre_rv(struct mdoc *mdoc, struct mdoc_node *node)
+{
+       enum mdoc_msec   msecs[2];
+
+       assert(MDOC_ELEM == node->type);
+       assert(MDOC_Rv == node->tok);
+
+       msecs[0] = MSEC_2;
+       msecs[1] = MSEC_3;
+       if ( ! pre_check_msecs(mdoc, node, 2, msecs))

                return(0);
                return(0);

+       return(pre_check_stdarg(mdoc, node));
+}
+
+
+static int
+pre_ex(struct mdoc *mdoc, struct mdoc_node *node)
+{
+       enum mdoc_msec   msecs[3];
+
+       assert(MDOC_ELEM == node->type);
+       assert(MDOC_Ex == node->tok);

 
 

-       if ( ! mbuf_nputstring(p, "</mdoc>", 7))
+       msecs[0] = MSEC_1;
+       msecs[1] = MSEC_6;
+       msecs[2] = MSEC_8;
+       if ( ! pre_check_msecs(mdoc, node, 3, msecs))

                return(0);
                return(0);

-       return(mbuf_newline(p));
+       return(pre_check_stdarg(mdoc, node));

 }
 
 
 }
 
 

-/* ARGSUSED */

 static int
 static int

-roffspecial(void *arg, int tok)
+pre_er(struct mdoc *mdoc, struct mdoc_node *node)

 {
 {

+       enum mdoc_msec   msecs[1];

 
 

-       return(1);
+       msecs[0] = MSEC_2;
+       return(pre_check_msecs(mdoc, node, 1, msecs));

 }
 
 
 static int
 }
 
 
 static int

-roffblkin(void *arg, int tok, int *argc, char **argv)
+pre_cd(struct mdoc *mdoc, struct mdoc_node *node)

 {
 {

-       struct md_valid *p;
-       int              i;
+       enum mdoc_msec   msecs[1];

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;
+       msecs[0] = MSEC_4;
+       return(pre_check_msecs(mdoc, node, 1, msecs));
+}

 
 

-       if (0 != p->pos) {
-               if ( ! mbuf_newline(p))
-                       return(0);
-               if ( ! mbuf_indent(p))
-                       return(0);
-       } else if ( ! mbuf_indent(p))
-               return(0);

 
 

-       if ( ! mbuf_nputstring(p, "<", 1))
-               return(0);
-       if ( ! mbuf_putstring(p, toknames[tok]))
-               return(0);
+static int
+pre_it(struct mdoc *mdoc, struct mdoc_node *node)
+{

 
 

-       for (i = 0; ROFF_ARGMAX != argc[i]; i++) {
-               if ( ! mbuf_nputstring(p, " ", 1))
-                       return(0);
-               if ( ! mbuf_putstring(p, tokargnames[argc[i]]))
-                       return(0);
-               if ( ! mbuf_nputstring(p, "=\"", 2))
-                       return(0);
-               if ( ! mbuf_putstring(p, argv[i] ? argv[i] : "true"))
-                       return(0);
-               if ( ! mbuf_nputstring(p, "\"", 1))
-                       return(0);
+       if (MDOC_BLOCK != node->type)
+               return(1);
+       return(pre_check_parent(mdoc, node, MDOC_Bl, MDOC_BODY));
+}
+
+
+static int
+pre_prologue(struct mdoc *mdoc, struct mdoc_node *node)
+{
+
+       if (SEC_PROLOGUE != mdoc->sec_lastn)
+               return(mdoc_nerr(mdoc, node, "macro may only be invoked in the prologue"));
+       assert(MDOC_ELEM == node->type);
+
+       /* Check for ordering. */
+
+       switch (node->tok) {
+       case (MDOC_Os):
+               if (mdoc->meta.title && mdoc->meta.date)
+                       break;
+               return(mdoc_nerr(mdoc, node, "prologue macro out-of-order"));
+       case (MDOC_Dt):
+               if (NULL == mdoc->meta.title && mdoc->meta.date)
+                       break;
+               return(mdoc_nerr(mdoc, node, "prologue macro out-of-order"));
+       case (MDOC_Dd):
+               if (NULL == mdoc->meta.title && 0 == mdoc->meta.date)
+                       break;
+               return(mdoc_nerr(mdoc, node, "prologue macro out-of-order"));
+       default:
+               abort();
+               /* NOTREACHED */

        }
 
        }
 

-       if ( ! mbuf_nputstring(p, ">", 1))
-               return(0);
-       if ( ! mbuf_newline(p))
-               return(0);
+       /* Check for repetition. */

 
 

-       p->indent++;
-       return(1);
+       switch (node->tok) {
+       case (MDOC_Os):
+               if (NULL == mdoc->meta.os)
+                       return(1);
+               break;
+       case (MDOC_Dd):
+               if (0 == mdoc->meta.date)
+                       return(1);
+               break;
+       case (MDOC_Dt):
+               if (NULL == mdoc->meta.title)
+                       return(1);
+               break;
+       default:
+               abort();
+               /* NOTREACHED */
+       }
+
+       return(mdoc_nerr(mdoc, node, "prologue macro repeated"));

 }
 
 
 static int
 }
 
 
 static int

-roffblkout(void *arg, int tok)
+post_bf(struct mdoc *mdoc)

 {
 {

-       struct md_valid *p;
+       char             *p;
+       struct mdoc_node *head;
+
+       if (MDOC_BLOCK != mdoc->last->type)
+               return(1);
+       assert(MDOC_Bf == mdoc->last->tok);
+       head = mdoc->last->data.block.head;
+       assert(head);
+
+       if (0 == mdoc->last->data.block.argc) {
+               if (head->child) {
+                       assert(MDOC_TEXT == head->child->type);
+                       p = head->child->data.text.string;
+                       if (xstrcmp(p, "Em"))
+                               return(1);
+                       else if (xstrcmp(p, "Li"))
+                               return(1);
+                       else if (xstrcmp(p, "Sm"))
+                               return(1);
+                       return(mdoc_nerr(mdoc, head->child, "invalid font mode"));
+               }
+               return(mdoc_err(mdoc, "macro expects an argument or parameter"));
+       }
+       if (head->child)
+               return(mdoc_err(mdoc, "macro expects an argument or parameter"));
+       if (1 == mdoc->last->data.block.argc)
+               return(1);
+       return(mdoc_err(mdoc, "macro expects an argument or parameter"));
+}

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;

 
 

-       p->indent--;
+static int
+post_nm(struct mdoc *mdoc)
+{

 
 

-       if (0 != p->pos) {
-               if ( ! mbuf_newline(p))
-                       return(0);
-               if ( ! mbuf_indent(p))
-                       return(0);
-       } else if ( ! mbuf_indent(p))
-               return(0);
+       assert(MDOC_ELEM == mdoc->last->type);
+       assert(MDOC_Nm == mdoc->last->tok);
+       if (mdoc->last->child)
+               return(1);
+       if (mdoc->meta.name)
+               return(1);
+       return(mdoc_err(mdoc, "macro `%s' has not been invoked with a name",
+                               mdoc_macronames[MDOC_Nm]));
+}

 
 

-       if ( ! mbuf_nputstring(p, "</", 2))
-               return(0);
-       if ( ! mbuf_putstring(p, toknames[tok]))
-               return(0);
-       if ( ! mbuf_nputstring(p, ">", 1))
-               return(0);
-       if ( ! mbuf_newline(p))
-               return(0);

 
 

-       return(1);
+static int
+post_xr(struct mdoc *mdoc)
+{
+       struct mdoc_node *n;
+
+       assert(MDOC_ELEM == mdoc->last->type);
+       assert(MDOC_Xr == mdoc->last->tok);
+       assert(mdoc->last->child);
+       assert(MDOC_TEXT == mdoc->last->child->type);
+
+       if (NULL == (n = mdoc->last->child->next))
+               return(1);
+       assert(MDOC_TEXT == n->type);
+       if (MSEC_DEFAULT != mdoc_atomsec(n->data.text.string))
+               return(1);
+       return(mdoc_nerr(mdoc, n, "invalid manual section"));

 }
 
 
 static int
 }
 
 
 static int

-roffin(void *arg, int tok, int space, int *argc, char **argv)
+post_at(struct mdoc *mdoc)

 {
 {

-       struct md_valid *p;
-       int              i;

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;
+       assert(MDOC_ELEM == mdoc->last->type);
+       assert(MDOC_At == mdoc->last->tok);

 
 

-       if (0 == p->pos && ! mbuf_indent(p))
-               return(0);
+       if (NULL == mdoc->last->child)
+               return(1);
+       assert(MDOC_TEXT == mdoc->last->child->type);

 
 

-       /* 
-        * FIXME: put into a buffer before writing (check line length).
-        */
+       if (ATT_DEFAULT != mdoc_atoatt(mdoc->last->child->data.text.string))
+               return(1);
+       return(mdoc_err(mdoc, "macro expects a valid AT&T version symbol"));
+}

 
 

-       if (space && ! mbuf_nputstring(p, " ", 1))
-               return(0);
-       if ( ! mbuf_nputstring(p, "<", 1))
-               return(0);
-       if ( ! mbuf_putstring(p, toknames[tok]))
-               return(0);

 
 

-       for (i = 0; ROFF_ARGMAX != argc[i]; i++) {
-               if ( ! mbuf_nputstring(p, " ", 1))
-                       return(0);
-               if ( ! mbuf_putstring(p, tokargnames[argc[i]]))
-                       return(0);
-               if ( ! mbuf_nputstring(p, "=\"", 2))
-                       return(0);
-               if ( ! mbuf_putstring(p, argv[i] ? argv[i] : "true"))
-                       return(0);
-               if ( ! mbuf_nputstring(p, "\"", 1))
-                       return(0);
+static int
+post_an(struct mdoc *mdoc)
+{
+
+       assert(MDOC_ELEM == mdoc->last->type);
+       assert(MDOC_An == mdoc->last->tok);
+
+       if (0 != mdoc->last->data.elem.argc) {
+               if (NULL == mdoc->last->child)
+                       return(1);
+               return(mdoc_err(mdoc, "macro expects either argument or parameters"));

        }
 
        }
 

-       return(mbuf_nputstring(p, ">", 1));
+       if (mdoc->last->child)
+               return(1);
+       return(mdoc_err(mdoc, "macro expects either argument or parameters"));

 }
 
 
 static int
 }
 
 
 static int

-roffout(void *arg, int tok)
+post_ex(struct mdoc *mdoc)

 {
 {

-       struct md_valid *p;

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;
+       assert(MDOC_ELEM == mdoc->last->type);
+       assert(MDOC_Ex == mdoc->last->tok);

 
 

-       if (0 == p->pos && ! mbuf_indent(p))
-               return(0);
+       if (0 == mdoc->last->data.elem.argc) {
+               if (mdoc->last->child)
+                       return(1);
+               return(mdoc_err(mdoc, "macro expects `%s' or a single child",
+                                       mdoc_argnames[MDOC_Std]));
+       }
+       if (mdoc->last->child)
+               return(mdoc_err(mdoc, "macro expects `%s' or a single child",
+                                       mdoc_argnames[MDOC_Std]));
+       if (1 != mdoc->last->data.elem.argc)
+               return(mdoc_err(mdoc, "macro expects `%s' or a single child",
+                                       mdoc_argnames[MDOC_Std]));
+       if (MDOC_Std != mdoc->last->data.elem.argv[0].arg)
+               return(mdoc_err(mdoc, "macro expects `%s' or a single child",
+                                       mdoc_argnames[MDOC_Std]));
+       return(1);
+}

 
 

-       if ( ! mbuf_nputstring(p, "</", 2))
-               return(0);
-       if ( ! mbuf_putstring(p, toknames[tok]))
-               return(0);
-       return(mbuf_nputstring(p, ">", 1));
+
+/* Warn if `Bl' type-specific syntax isn't reflected in items. */
+static int
+post_it(struct mdoc *mdoc)
+{
+       int               type, sv;
+#define        TYPE_NONE        (0)
+#define        TYPE_BODY        (1)
+#define        TYPE_HEAD        (2)
+       size_t            i, argc;
+       struct mdoc_node *n;
+
+       if (MDOC_BLOCK != mdoc->last->type)
+               return(1);
+
+       assert(MDOC_It == mdoc->last->tok);
+
+       n = mdoc->last->parent;
+       assert(n);
+       assert(MDOC_Bl == n->tok);
+
+       n = n->parent;
+       assert(MDOC_BLOCK == n->type);
+       assert(MDOC_Bl == n->tok);
+
+       argc = n->data.block.argc;
+       type = TYPE_NONE;
+       sv = -1;
+       
+       /* Some types require block-head, some not. */
+
+       /* LINTED */
+       for (i = 0; TYPE_NONE == type && i < argc; i++)
+               switch (n->data.block.argv[(int)i].arg) {
+               case (MDOC_Tag):
+                       /* FALLTHROUGH */
+               case (MDOC_Diag):
+                       /* FALLTHROUGH */
+               case (MDOC_Hang):
+                       /* FALLTHROUGH */
+               case (MDOC_Ohang):
+                       /* FALLTHROUGH */
+               case (MDOC_Inset):
+                       type = TYPE_HEAD;
+                       sv = n->data.block.argv[(int)i].arg;
+                       break;
+               case (MDOC_Bullet):
+                       /* FALLTHROUGH */
+               case (MDOC_Dash):
+                       /* FALLTHROUGH */
+               case (MDOC_Enum):
+                       /* FALLTHROUGH */
+               case (MDOC_Hyphen):
+                       /* FALLTHROUGH */
+               case (MDOC_Item):
+                       /* FALLTHROUGH */
+               case (MDOC_Column):
+                       type = TYPE_BODY;
+                       sv = n->data.block.argv[(int)i].arg;
+                       break;
+               default:
+                       break;
+               }
+
+       assert(TYPE_NONE != type);
+
+       if (TYPE_HEAD == type) {
+               n = mdoc->last->data.block.head;
+               assert(n);
+               if (NULL == n->child)
+                       if ( ! mdoc_warn(mdoc, WARN_SYNTAX, "macro suggests line parameters"))
+                               return(0);
+
+               n = mdoc->last->data.block.body;
+               assert(n);
+               if (NULL == n->child)
+                       if ( ! mdoc_warn(mdoc, WARN_SYNTAX, "macro suggests body children"))
+                               return(0);
+
+               return(1);
+       }
+
+       assert(TYPE_BODY == type);
+       assert(mdoc->last->data.block.head);
+
+       n = mdoc->last->data.block.head;
+       assert(n);
+       if (n->child)
+               if ( ! mdoc_warn(mdoc, WARN_SYNTAX, "macro suggests no line parameters"))
+                       return(0);
+
+       n = mdoc->last->data.block.body;
+       assert(n);
+       if (NULL == n->child)
+               if ( ! mdoc_warn(mdoc, WARN_SYNTAX, "macro suggests body children"))
+                       return(0);
+
+       assert(-1 != sv);
+       if (MDOC_Column != sv) 
+               return(1);
+
+       /* Make sure the number of columns is sane. */
+
+       argc = mdoc->last->parent->parent->data.block.argv->sz;
+       n = mdoc->last->data.block.head->child;
+
+       for (i = 0; n; n = n->next)
+               i++;
+
+       if (i == argc)
+               return(1);
+       return(mdoc_err(mdoc, "expected %zu list columns, have %zu", argc, i));
+#undef TYPE_NONE
+#undef TYPE_BODY
+#undef TYPE_HEAD

 }
 
 
 }
 
 

-static void
-roffmsg(void *arg, enum roffmsg lvl, 
-               const char *buf, const char *pos, char *msg)
+static int
+post_bl(struct mdoc *mdoc)

 {
 {

-       char            *level;
-       struct md_valid *p;
+       struct mdoc_node *n;

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;
+       if (MDOC_BODY != mdoc->last->type)
+               return(1);
+       assert(MDOC_Bl == mdoc->last->tok);

 
 

-       switch (lvl) {
-       case (ROFF_WARN):
-               if ( ! (MD_WARN_ALL & p->args->warnings))
-                       return;
-               level = "warning";
+       /* LINTED */
+       for (n = mdoc->last->child; n; n = n->next) {
+               if (MDOC_BLOCK == n->type) 
+                       if (MDOC_It == n->tok)
+                               continue;

                break;
                break;

-       case (ROFF_ERROR):
-               level = "error";
+       }
+       if (NULL == n)
+               return(1);
+       return(mdoc_nerr(mdoc, n, "invalid child of parent macro `Bl'"));
+}
+
+
+static int
+ebool(struct mdoc *mdoc)
+{
+       struct mdoc_node *n;
+
+       assert(MDOC_ELEM == mdoc->last->type);
+       /* LINTED */
+       for (n = mdoc->last->child; n; n = n->next) {
+               if (MDOC_TEXT != n->type)
+                       break;
+               if (xstrcmp(n->data.text.string, "on"))
+                       continue;
+               if (xstrcmp(n->data.text.string, "off"))
+                       continue;

                break;
                break;

-       default:
-               abort();

        }
        }

-       
-       if (pos)
-               (void)fprintf(stderr, "%s:%zu: %s: %s (column %zu)\n", 
-                               p->rbuf->name, p->rbuf->line, level, 
-                               msg, pos - buf);
-       else
-               (void)fprintf(stderr, "%s: %s: %s\n", 
-                               p->rbuf->name, level, msg);
+       if (NULL == n)
+               return(1);
+       return(mdoc_nerr(mdoc, n, "expected boolean value"));
+}
+
+
+static int
+post_root(struct mdoc *mdoc)
+{

 
 

+       if (NULL == mdoc->last->child)
+               return(mdoc_err(mdoc, "document has no data"));
+       if (NULL == mdoc->meta.title)
+               return(mdoc_err(mdoc, "document has incomplete prologue"));
+       if (NULL == mdoc->meta.os)
+               return(mdoc_err(mdoc, "document has incomplete prologue"));
+       if (0 == mdoc->meta.date)
+               return(mdoc_err(mdoc, "document has incomplete prologue"));
+       return(1);

 }
 
 
 }
 
 

+/* Warn if conventional sections are out of order. */

 static int
 static int

-roffdata(void *arg, int space, char *buf)
+post_sh(struct mdoc *mdoc)

 {
 {

-       struct md_valid *p;
+       char              buf[64];
+       enum mdoc_sec     sec;
+
+       if (MDOC_HEAD != mdoc->last->type)
+               return(1);
+       assert(MDOC_Sh == mdoc->last->tok);
+
+       if ( ! xstrlcats(buf, mdoc->last->child, 64))
+               return(mdoc_err(mdoc, "macro parameters too long"));
+
+       if (SEC_CUSTOM == (sec = mdoc_atosec(buf)))
+               return(1);
+       if (sec > mdoc->sec_lastn)
+               return(1);
+       if (sec == mdoc->sec_lastn)
+               return(mdoc_warn(mdoc, WARN_SYNTAX, "section repeated"));
+       return(mdoc_warn(mdoc, WARN_SYNTAX, "section out of conventional order"));
+}

 
 

-       assert(arg);
-       p = (struct md_valid *)arg;
-       return(mbuf_data(p, space, buf));
+
+int
+mdoc_valid_pre(struct mdoc *mdoc, struct mdoc_node *node)
+{
+       v_pre           *p;
+
+       if (MDOC_TEXT == node->type)
+               return(1);
+       assert(MDOC_ROOT != node->type);
+
+       if (NULL == mdoc_valids[node->tok].pre)
+               return(1);
+       for (p = mdoc_valids[node->tok].pre; *p; p++)
+               if ( ! (*p)(mdoc, node)) 
+                       return(0);
+       return(1);

 }
 }

+
+
+int
+mdoc_valid_post(struct mdoc *mdoc)
+{
+       v_post          *p;
+
+       if (MDOC_VALID & mdoc->last->flags)
+               return(1);
+       mdoc->last->flags |= MDOC_VALID;
+
+       if (MDOC_TEXT == mdoc->last->type)
+               return(1);
+       if (MDOC_ROOT == mdoc->last->type)
+               return(post_root(mdoc));
+
+       if (NULL == mdoc_valids[mdoc->last->tok].post)
+               return(1);
+       for (p = mdoc_valids[mdoc->last->tok].post; *p; p++)
+               if ( ! (*p)(mdoc)) 
+                       return(0);
+
+       return(1);
+}
+