Moved prologue-pruning into action.c.

Added line-arg softmax.

7 files changed, 257 insertions, 101 deletions

diff --git a/action.c b/action.c
index 1d8a91c5..abe3b901 100644
--- a/action.c
+++ b/action.c
@@ -29,11 +29,13 @@ struct	actions {
 
 /* Per-macro action routines. */
 
-static int	 post_sh(struct mdoc *);
-static int	 post_os(struct mdoc *);
-static int	 post_dt(struct mdoc *);
-static int	 post_dd(struct mdoc *);
-static int	 post_nm(struct mdoc *);
+static	int	 post_sh(struct mdoc *);
+static	int	 post_os(struct mdoc *);
+static	int	 post_dt(struct mdoc *);
+static	int	 post_dd(struct mdoc *);
+static	int	 post_nm(struct mdoc *);
+
+static	int	 post_prologue(struct mdoc *);
 
 /* Array of macro action routines. */
 
@@ -226,7 +228,8 @@ post_dt(struct mdoc *mdoc)
 
 	if (NULL == mdoc->meta.title)
 		mdoc->meta.title = xstrdup("untitled");
-	return(1);
+
+	return(post_prologue(mdoc));
 }
 
 
@@ -244,7 +247,9 @@ post_os(struct mdoc *mdoc)
 
 	mdoc->meta.os = xstrdup(buf[0] ? buf : "local");
 	mdoc->sec_lastn = mdoc->sec_last = SEC_BODY;
-	return(1);
+	mdoc->flags |= MDOC_BODYPARSE;
+
+	return(post_prologue(mdoc));
 }
 
 
@@ -285,15 +290,41 @@ post_dd(struct mdoc *mdoc)
 	}
 
 	if (mdoc->meta.date && NULL == n)
-		return(1);
+		return(post_prologue(mdoc));
 	else if (n)
 		return(mdoc_err(mdoc, "invalid parameter syntax"));
 	if ((mdoc->meta.date = mdoc_atotime(date)))
-		return(1);
+		return(post_prologue(mdoc));
 	return(mdoc_err(mdoc, "invalid parameter syntax"));
 }
 
 
+static int
+post_prologue(struct mdoc *mdoc)
+{
+	struct mdoc_node *n;
+
+	if (mdoc->last->parent->child == mdoc->last)
+		mdoc->last->parent->child = mdoc->last->prev;
+	if (mdoc->last->prev)
+		mdoc->last->prev->next = NULL;
+
+	n = mdoc->last;
+	assert(NULL == mdoc->last->next);
+
+	if (mdoc->last->prev) {
+		mdoc->last = mdoc->last->prev;
+		mdoc->next = MDOC_NEXT_SIBLING;
+	} else {
+		mdoc->last = mdoc->last->parent;
+		mdoc->next = MDOC_NEXT_CHILD;
+	}
+
+	mdoc_node_freelist(n);
+	return(1);
+}
+
+
 int
 mdoc_action_post(struct mdoc *mdoc)
 {
diff --git a/argv.c b/argv.c
index 9c37bf2c..b0a33c13 100644
--- a/argv.c
+++ b/argv.c
@@ -25,8 +25,9 @@
 
 #include "private.h"
 
-
 /* FIXME: .It called with -column and quoted arguments. */
+/* FIXME: if arguments are quoted, they should not be later parsed for
+ * macros. */
 
 static	int		 lookup(int, const char *);
 static	int		 parse(struct mdoc *, int,
diff --git a/macro.c b/macro.c
index 2185e181..9851f60c 100644
--- a/macro.c
+++ b/macro.c
@@ -25,19 +25,65 @@
 #include <time.h>
 #endif
 
-#include "private.h"
+/*
+ * This has scanning/parsing routines, each of which extract a macro and
+ * its arguments and parameters, then know how to progress to the next
+ * macro.  Macros are parsed according as follows:
+ *
+ *   ELEMENT:	  TEXT | epsilon
+ *   BLOCK:	  HEAD PUNCT BODY PUNCT BLOCK_TAIL PUNCT
+ *   BLOCK_TAIL:  TAIL | epsilon
+ *   HEAD:	  ELEMENT | TEXT | BLOCK | epsilon
+ *   BODY:	  ELEMENT | TEXT | BLOCK | epsilon
+ *   TAIL:	  TEXT | epsilon
+ *   PUNCT:	  TEXT (delimiters) | epsilon
+ *
+ * These are arranged into a parse tree, an example of which follows:
+ *
+ *   ROOT
+ *       BLOCK (.Sh)
+ *           HEAD
+ *               TEXT (`NAME')
+ *           BODY
+ *               ELEMENT (.Nm)
+ *                   TEXT (`mdocml')
+ *               ELEMENT (.Nd)
+ *                   TEXT (`mdoc macro compiler')
+ *               BLOCK (.Op)
+ *                   HEAD
+ *                       ELEMENT (.Fl)
+ *                           TEXT (`v')
+ *               BLOCK (.Op)
+ *                   HEAD
+ *                       ELEMENT (.Fl)
+ *                           TEXT (`v')
+ *                       ELEMENT (.Fl)
+ *                           TEXT (`W')
+ *                       ELEMENT (.Ns)
+ *                       ELEMENT (.Ar)
+ *                           TEXT (`err...')
+ *
+ * These types are always per-line except for block bodies, which may
+ * span multiple lines.  Macros are assigned a parsing routine, which
+ * corresponds to the type, in the mdoc_macros table.
+ *
+ * Note that types are general:  there can be several parsing routines
+ * corresponding to a single type.  The macro_text function, for
+ * example, parses an ELEMENT type (see the function definition for
+ * details) that may be interrupted by further macros; the
+ * macro_constant function, on the other hand, parses an ELEMENT type
+ * spanning a single line.
+ */
 
-/* FIXME: maxlineargs should be per LINE, no per TOKEN. */
+#include "private.h"
 
-static	int	  rewind_alt(int);
-static	int	  rewind_dohalt(int, enum mdoc_type, 
-			const struct mdoc_node *);
 #define	REWIND_REWIND	(1 << 0)
 #define	REWIND_NOHALT	(1 << 1)
 #define	REWIND_HALT	(1 << 2)
+static	int	  rewind_dohalt(int, enum mdoc_type, 
+			const struct mdoc_node *);
+static	int	  rewind_alt(int);
 static	int	  rewind_dobreak(int, const struct mdoc_node *);
-
-
 static	int	  rewind_elem(struct mdoc *, int);
 static	int	  rewind_impblock(struct mdoc *, int, int, int);
 static	int	  rewind_expblock(struct mdoc *, int, int, int);
@@ -158,7 +204,7 @@ rewind_dohalt(int tok, enum mdoc_type type, const struct mdoc_node *p)
 	case (MDOC_Qq):
 		/* FALLTHROUGH */
 	case (MDOC_Sq):
-		assert(MDOC_BODY != type);
+		assert(MDOC_HEAD != type);
 		assert(MDOC_TAIL != type);
 		if (type == p->type && tok == p->tok)
 			return(REWIND_REWIND);
@@ -412,6 +458,10 @@ append_delims(struct mdoc *mdoc, int line, int *pos, char *buf)
 }
 
 
+/*
+ * Close out an explicit scope.  This optionally parses a TAIL type with
+ * a set number of TEXT children.
+ */
 int
 macro_scoped_close(MACRO_PROT_ARGS)
 {
@@ -497,6 +547,30 @@ macro_scoped_close(MACRO_PROT_ARGS)
 }
 
 
+/*
+ * A general text macro.  This is a complex case because of punctuation.
+ * If a text macro is followed by words, then punctuation, the macro is
+ * "stopped" and "reopened" following the punctuation.  Thus, the
+ * following arises:
+ *
+ *    .Fl a ; b
+ *
+ *    ELEMENT (.Fl)
+ *        TEXT (`a')
+ *    TEXT (`;')
+ *    ELEMENT (.Fl)
+ *        TEXT (`b')
+ *
+ * This must handle the following situations:
+ *
+ *    .Fl Ar b ; ;
+ *
+ *    ELEMENT (.Fl)
+ *    ELEMENT (.Ar)
+ *        TEXT (`b')
+ *    TEXT (`;')
+ *    TEXT (`;')
+ */
 int
 macro_text(MACRO_PROT_ARGS)
 {
@@ -603,6 +677,30 @@ macro_text(MACRO_PROT_ARGS)
 }
 
 
+/*
+ * Handle explicit-scope (having a different closure token) and implicit
+ * scope (closing out prior scopes when re-invoked) macros.  These
+ * constitute the BLOCK type and usually span multiple lines.  These
+ * always have HEAD and sometimes have BODY types.  In the multi-line
+ * case:
+ *
+ *     .Bd -ragged
+ *     Text.
+ *     .Fl macro
+ *     Another.
+ *     .Ed
+ *
+ *     BLOCK (.Bd)
+ *         HEAD
+ *         BODY
+ *             TEXT (`Text.')
+ *             ELEMENT (.Fl)
+ *                 TEXT (`macro')
+ *             TEXT (`Another.')
+ *
+ * Note that the `.It' macro, possibly the most difficult (as it has
+ * embedded scope, etc.) is handled by this routine.
+ */
 int
 macro_scoped(MACRO_PROT_ARGS)
 {
@@ -704,6 +802,25 @@ macro_scoped(MACRO_PROT_ARGS)
 }
 
 
+/*
+ * This handles a case of implicitly-scoped macro (BLOCK) limited to a
+ * single line.  Instead of being closed out by a subsequent call to
+ * another macro, the scope is closed at the end of line.  These don't
+ * have BODY or TAIL types.  Notice that the punctuation falls outside
+ * of the HEAD type.
+ *
+ *     .Qq a Fl b Ar d ; ;
+ *
+ *     BLOCK (Qq)
+ *         HEAD
+ *             TEXT (`a')
+ *             ELEMENT (.Fl)
+ *                 TEXT (`b')
+ *             ELEMENT (.Ar)
+ *                 TEXT (`d')
+ *         TEXT (`;')
+ *         TEXT (`;')
+ */
 int
 macro_scoped_line(MACRO_PROT_ARGS)
 {
@@ -716,6 +833,9 @@ macro_scoped_line(MACRO_PROT_ARGS)
 
 	if ( ! mdoc_head_alloc(mdoc, line, ppos, tok))
 		return(0);
+	mdoc->next = MDOC_NEXT_SIBLING;
+	if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
+		return(0);
 	mdoc->next = MDOC_NEXT_CHILD;
 
 	/* XXX - no known argument macros. */
@@ -747,16 +867,31 @@ macro_scoped_line(MACRO_PROT_ARGS)
 	}
 
 	if (1 == ppos) {
-		if ( ! rewind_subblock(MDOC_HEAD, mdoc, tok, line, ppos))
+		if ( ! rewind_subblock(MDOC_BODY, mdoc, tok, line, ppos))
 			return(0);
 		if ( ! append_delims(mdoc, line, pos, buf))
 			return(0);
-	} else if ( ! rewind_subblock(MDOC_HEAD, mdoc, tok, line, ppos))
+	} else if ( ! rewind_subblock(MDOC_BODY, mdoc, tok, line, ppos))
 		return(0);
 	return(rewind_impblock(mdoc, tok, line, ppos));
 }
 
 
+/*
+ * A constant-scoped macro is like a simple-scoped macro (mdoc_scoped)
+ * except that it doesn't handle implicit scopes and explicit ones have
+ * a fixed number of TEXT children to the BODY.
+ *
+ *     .Fl a So b Sc ;
+ *
+ *     ELEMENT (.Fl)
+ *         TEXT (`a')
+ *     BLOCK (.So)
+ *         HEAD
+ *         BODY
+ *             TEXT (`b')
+ *     TEXT (';')
+ */
 int
 macro_constant_scoped(MACRO_PROT_ARGS)
 {
@@ -856,6 +991,19 @@ macro_constant_scoped(MACRO_PROT_ARGS)
 }
 
 
+/*
+ * A delimited constant is very similar to the macros parsed by
+ * macro_text except that, in the event of punctuation, the macro isn't
+ * "re-opened" as it is in macro_text.  Also, these macros have a fixed
+ * number of parameters.
+ *
+ *    .Fl a No b
+ *
+ *    ELEMENT (.Fl)
+ *        TEXT (`a')
+ *    ELEMENT (.No)
+ *    TEXT (`b')
+ */
 int
 macro_constant_delimited(MACRO_PROT_ARGS)
 {
@@ -958,13 +1106,18 @@ macro_constant_delimited(MACRO_PROT_ARGS)
 }
 
 
+/*
+ * A constant macro is the simplest classification.  It spans an entire
+ * line.  
+ */
 int
 macro_constant(MACRO_PROT_ARGS)
 {
 	int		  c, lastarg, argc, fl;
 	struct mdoc_arg	  argv[MDOC_LINEARG_MAX];
 	char		 *p;
-	struct mdoc_node *n;
+
+	assert( ! (MDOC_CALLABLE & mdoc_macros[tok].flags));
 
 	fl = 0;
 	if (MDOC_QUOTABLE & mdoc_macros[tok].flags)
@@ -1020,31 +1173,7 @@ macro_constant(MACRO_PROT_ARGS)
 		mdoc->next = MDOC_NEXT_SIBLING;
 	}
 
-	if ( ! rewind_elem(mdoc, tok))
-		return(0);
-	if ( ! (MDOC_NOKEEP & mdoc_macros[tok].flags))
-		return(1);
-
-	assert(mdoc->last->tok == tok);
-	if (mdoc->last->parent->child == mdoc->last)
-		mdoc->last->parent->child = mdoc->last->prev;
-	if (mdoc->last->prev)
-		mdoc->last->prev->next = NULL;
-
-	n = mdoc->last;
-	assert(NULL == mdoc->last->next);
-
-	if (mdoc->last->prev) {
-		mdoc->last = mdoc->last->prev;
-		mdoc->next = MDOC_NEXT_SIBLING;
-	} else {
-		mdoc->last = mdoc->last->parent;
-		mdoc->next = MDOC_NEXT_CHILD;
-	}
-
-	mdoc_node_freelist(n);
-
-	return(1);
+	return(rewind_elem(mdoc, tok));
 }
 
 
@@ -1057,6 +1186,11 @@ macro_obsolete(MACRO_PROT_ARGS)
 }
 
 
+/*
+ * This is called at the end of parsing.  It must traverse up the tree,
+ * closing out open [implicit] scopes.  Obviously, open explicit scopes
+ * are errors.
+ */
 int
 macro_end(struct mdoc *mdoc)
 {
diff --git a/mdoc.c b/mdoc.c
index ffacbedf..67350c40 100644
--- a/mdoc.c
+++ b/mdoc.c
@@ -85,9 +85,9 @@ const	char *const __mdoc_argnames[MDOC_ARG_MAX] = {
 
 const	struct mdoc_macro __mdoc_macros[MDOC_MAX] = {
 	{ NULL, 0 }, /* \" */
-	{ macro_constant, MDOC_PROLOGUE | MDOC_NOKEEP }, /* Dd */
-	{ macro_constant, MDOC_PROLOGUE | MDOC_NOKEEP }, /* Dt */
-	{ macro_constant, MDOC_PROLOGUE | MDOC_NOKEEP }, /* Os */
+	{ macro_constant, MDOC_PROLOGUE }, /* Dd */
+	{ macro_constant, MDOC_PROLOGUE }, /* Dt */
+	{ macro_constant, MDOC_PROLOGUE }, /* Os */
 	{ macro_scoped, 0 }, /* Sh */
 	{ macro_scoped, 0 }, /* Ss */ 
 	{ macro_text, 0 }, /* Pp */ 
@@ -295,14 +295,15 @@ mdoc_parseln(struct mdoc *mdoc, int line, char *buf)
 	if (MDOC_HALT & mdoc->flags)
 		return(0);
 
+	mdoc->linetok = 0;
+
 	if ('.' != *buf) {
-		if (SEC_PROLOGUE != mdoc->sec_lastn) {
-			if ( ! mdoc_word_alloc(mdoc, line, 0, buf))
-				return(0);
-			mdoc->next = MDOC_NEXT_SIBLING;
-			return(1);
-		}
-		return(mdoc_perr(mdoc, line, 0, "text disallowed"));
+		if ( ! (MDOC_BODYPARSE & mdoc->flags))
+			return(mdoc_perr(mdoc, line, 0, "text disallowed"));
+		if ( ! mdoc_word_alloc(mdoc, line, 0, buf))
+			return(0);
+		mdoc->next = MDOC_NEXT_SIBLING;
+		return(1);
 	}
 
 	if (buf[1] && '\\' == buf[1])
@@ -400,8 +401,8 @@ mdoc_macro(struct mdoc *mdoc, int tok,
 	assert(mdoc_macros[tok].fp);
 
 	if ( ! (MDOC_PROLOGUE & mdoc_macros[tok].flags) &&
-			SEC_PROLOGUE == mdoc->sec_lastn)
-		return(mdoc_perr(mdoc, ln, ppos, "macro disallowed in document prologue"));
+			! (MDOC_BODYPARSE & mdoc->flags))
+		return(mdoc_perr(mdoc, ln, ppos, "macro disallowed: not in document body"));
 	if (1 != ppos && ! (MDOC_CALLABLE & mdoc_macros[tok].flags))
 		return(mdoc_perr(mdoc, ln, ppos, "macro not callable"));
 	return((*mdoc_macros[tok].fp)(mdoc, tok, ln, ppos, pos, buf));
@@ -417,6 +418,26 @@ mdoc_node_append(struct mdoc *mdoc, struct mdoc_node *p)
 	assert(mdoc->first);
 	assert(MDOC_ROOT != p->type);
 
+	/* See if we exceed the suggest line-max. */
+
+	switch (p->type) {
+	case (MDOC_TEXT):
+		/* FALLTHROUGH */
+	case (MDOC_ELEM):
+		/* FALLTHROUGH */
+	case (MDOC_BLOCK):
+		mdoc->linetok++;
+		break;
+	default:
+		break;
+	}
+
+	if (mdoc->linetok > MDOC_LINEARG_SOFTMAX) 
+		if ( ! mdoc_nwarn(mdoc, p, WARN_COMPAT, 
+					"suggested %d tokens per line exceeded (has %d)",
+					MDOC_LINEARG_SOFTMAX, mdoc->linetok))
+			return(0);
+
 	if (MDOC_TEXT == mdoc->last->type)
 		on = "<text>";
 	else if (MDOC_ROOT == mdoc->last->type)
diff --git a/mdocml.c b/mdocml.c
index 0befca5a..87884080 100644
--- a/mdocml.c
+++ b/mdocml.c
@@ -34,19 +34,7 @@
 
 #define	MD_LINE_SZ	(256)		/* Max input line size. */
 
-/*
- * Put this into a mdoctrans.h, which has:
- *
- * struct mdoc_trans; (opaque)
- *
- * struct mdoc_trans *mdoc_trans_alloc(const char *filter);
- *
- * mdoc_trans_free(struct mdoc_trans *);
- *
- * int mdoc_trans_getopt(struct mdoc_trans *, char *);
- *
- * int mdoc_trans_print(struct mdoc_trans *, const struct mdoc_node *);
- */
+/* TODO: have a struct for each transformer. */
 
 typedef	int		(*mdocprint)(const struct mdoc_node *);
 
diff --git a/private.h b/private.h
index 7dfb24b3..cf894321 100644
--- a/private.h
+++ b/private.h
@@ -30,8 +30,10 @@ struct	mdoc {
 	void		 *data;
 	struct mdoc_cb	  cb;
 	void		 *htab;
+	int		  linetok;
 	int		  flags;
 #define	MDOC_HALT	 (1 << 0)
+#define	MDOC_BODYPARSE	 (1 << 1)
 	enum mdoc_next	  next;
 	struct mdoc_node *last;
 	struct mdoc_node *first;
@@ -41,9 +43,13 @@ struct	mdoc {
 };
 
 
-/* FIXME: it's 9 (this isn't used properly). */
+/* Hard-limit of macro arguments. */
 
-#define	MDOC_LINEARG_MAX 12
+#define	MDOC_LINEARG_MAX 9
+
+/* Suggested limit of macro arguments. */
+
+#define	MDOC_LINEARG_SOFTMAX 9
 
 #define	MACRO_PROT_ARGS	struct mdoc *mdoc, int tok, int line, \
 			int ppos, int *pos, char *buf
@@ -57,7 +63,6 @@ struct	mdoc_macro {
 #define	MDOC_QUOTABLE	 (1 << 3)
 #define	MDOC_PROLOGUE	 (1 << 4)
 #define	MDOC_TABSEP	 (1 << 5)
-#define	MDOC_NOKEEP	 (1 << 6)
 };
 
 #define	mdoc_nwarn(mdoc, node, type, fmt, ...) \
diff --git a/validate.c b/validate.c
index d92a0947..7a1151db 100644
--- a/validate.c
+++ b/validate.c
@@ -27,7 +27,6 @@ typedef	int	(*v_post)(struct mdoc *);
 /* FIXME: some sections should only occur in specific msecs. */
 /* FIXME: ignoring Pp. */
 /* FIXME: math symbols. */
-/* FIXME: make sure prologue is complete. */
 /* FIXME: valid character-escape checks. */
 /* FIXME: make sure required sections are included (NAME, ...). */
 
@@ -72,7 +71,6 @@ static	int	pre_prologue(struct mdoc *, struct mdoc_node *);
 
 static	int	herr_ge1(struct mdoc *);
 static	int	herr_le1(struct mdoc *);
-static	int	hwarn_ge1(struct mdoc *);
 static	int	herr_eq0(struct mdoc *);
 static	int	eerr_eq0(struct mdoc *);
 static	int	eerr_le1(struct mdoc *);
@@ -82,7 +80,6 @@ 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	berr_eq0(struct mdoc *);
 static	int	ewarn_ge1(struct mdoc *);
 static	int	ebool(struct mdoc *);
 static	int	post_sh(struct mdoc *);
@@ -119,14 +116,13 @@ 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[] = { hwarn_ge1, berr_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_d1[] = { herr_ge1, 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 };
@@ -145,8 +141,8 @@ const	struct valids mdoc_valids[MDOC_MAX] = {
 	{ pres_sh, posts_sh }, /* Sh */ 
 	{ pres_ss, posts_ss }, /* Ss */ 
 	{ NULL, posts_pp }, /* Pp */ 
-	{ pres_d1, posts_d1 }, /* D1 */
-	{ pres_d1, posts_d1 }, /* Dl */
+	{ pres_d1, posts_wline }, /* D1 */
+	{ pres_d1, posts_wline }, /* Dl */
 	{ pres_bd, posts_bd }, /* Bd */
 	{ NULL, NULL }, /* Ed */
 	{ pres_bl, posts_bl }, /* Bl */ 
@@ -365,16 +361,6 @@ pre_check_parent(struct mdoc *mdoc, struct mdoc_node *node,
 
 
 static int
-berr_eq0(struct mdoc *mdoc)
-{
-
-	if (MDOC_BODY != mdoc->last->type)
-		return(1);
-	return(post_check_children_eq(mdoc, "body children", 0));
-}
-
-
-static int
 bwarn_ge1(struct mdoc *mdoc)
 {
 
@@ -467,16 +453,6 @@ herr_eq0(struct mdoc *mdoc)
 
 
 static int
-hwarn_ge1(struct mdoc *mdoc)
-{
-
-	if (MDOC_HEAD != mdoc->last->type)
-		return(1);
-	return(post_check_children_wgt(mdoc, "parameters", 0));
-}
-
-
-static int
 herr_le1(struct mdoc *mdoc)
 {
 	if (MDOC_HEAD != mdoc->last->type)