===================================================================
RCS file: /cvs/mandoc/mdoc.c,v
retrieving revision 1.84
retrieving revision 1.177
diff -u -p -r1.84 -r1.177
--- mandoc/mdoc.c	2009/06/17 07:59:47	1.84
+++ mandoc/mdoc.c	2011/01/03 11:27:33	1.177
@@ -1,6 +1,7 @@
-/*	$Id: mdoc.c,v 1.84 2009/06/17 07:59:47 kristaps Exp $ */
+/*	$Id: mdoc.c,v 1.177 2011/01/03 11:27:33 kristaps Exp $ */
 /*
- * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
+ * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
+ * Copyright (c) 2010 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -14,25 +15,23 @@
  * 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 <sys/types.h>
+
 #include <assert.h>
-#include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
+#include "mandoc.h"
 #include "libmdoc.h"
+#include "libmandoc.h"
 
-enum	merr {
-	ENOCALL,
-	EBODYPROL,
-	EPROLBODY,
-	ESPACE,
-	ETEXTPROL,
-	ENOBLANK,
-	EMALLOC
-};
-
 const	char *const __mdoc_macronames[MDOC_MAX] = {		 
 	"Ap",		"Dd",		"Dt",		"Os",
 	"Sh",		"Ss",		"Pp",		"D1",
@@ -45,11 +44,11 @@ const	char *const __mdoc_macronames[MDOC_MAX] = {		 
 	"Nm",		"Op",		"Ot",		"Pa",
 	"Rv",		"St",		"Va",		"Vt",
 	/* LINTED */
-	"Xr",		"\%A",		"\%B",		"\%D",
+	"Xr",		"%A",		"%B",		"%D",
 	/* LINTED */
-	"\%I",		"\%J",		"\%N",		"\%O",
+	"%I",		"%J",		"%N",		"%O",
 	/* LINTED */
-	"\%P",		"\%R",		"\%T",		"\%V",
+	"%P",		"%R",		"%T",		"%V",
 	"Ac",		"Ao",		"Aq",		"At",
 	"Bc",		"Bf",		"Bo",		"Bq",
 	"Bsx",		"Bx",		"Db",		"Dc",
@@ -66,9 +65,11 @@ const	char *const __mdoc_macronames[MDOC_MAX] = {		 
 	"Fr",		"Ud",		"Lb",		"Lp",
 	"Lk",		"Mt",		"Brq",		"Bro",
 	/* LINTED */
-	"Brc",		"\%C",		"Es",		"En",
+	"Brc",		"%C",		"Es",		"En",
 	/* LINTED */
-	"Dx",		"\%Q"
+	"Dx",		"%Q",		"br",		"sp",
+	/* LINTED */
+	"%U",		"Ta"
 	};
 
 const	char *const __mdoc_argnames[MDOC_ARG_MAX] = {		 
@@ -80,28 +81,33 @@ const	char *const __mdoc_argnames[MDOC_ARG_MAX] = {		 
 	"ohang",		"inset",		"column",	 
 	"width",		"compact",		"std",	 
 	"filled",		"words",		"emphasis",
-	"symbolic",		"nested"
+	"symbolic",		"nested",		"centered"
 	};
 
 const	char * const *mdoc_macronames = __mdoc_macronames;
 const	char * const *mdoc_argnames = __mdoc_argnames;
 
+static	void		  mdoc_node_free(struct mdoc_node *);
+static	void		  mdoc_node_unlink(struct mdoc *, 
+				struct mdoc_node *);
 static	void		  mdoc_free1(struct mdoc *);
-static	int		  mdoc_alloc1(struct mdoc *);
+static	void		  mdoc_alloc1(struct mdoc *);
 static	struct mdoc_node *node_alloc(struct mdoc *, int, int, 
-				int, enum mdoc_type);
+				enum mdoct, enum mdoc_type);
 static	int		  node_append(struct mdoc *, 
 				struct mdoc_node *);
-static	int		  parsetext(struct mdoc *, int, char *);
-static	int		  parsemacro(struct mdoc *, int, char *);
-static	int		  macrowarn(struct mdoc *, int, const char *);
-static	int		  perr(struct mdoc *, int, int, enum merr);
+static	int		  mdoc_ptext(struct mdoc *, int, char *, int);
+static	int		  mdoc_pmacro(struct mdoc *, int, char *, int);
+static	int		  mdoc_span_alloc(struct mdoc *, 
+				const struct tbl_span *);
 
+
 const struct mdoc_node *
 mdoc_node(const struct mdoc *m)
 {
 
-	return(MDOC_HALT & m->flags ? NULL : m->first);
+	assert( ! (MDOC_HALT & m->flags));
+	return(m->first);
 }
 
 
@@ -109,16 +115,20 @@ const struct mdoc_meta *
 mdoc_meta(const struct mdoc *m)
 {
 
-	return(MDOC_HALT & m->flags ? NULL : &m->meta);
+	assert( ! (MDOC_HALT & m->flags));
+	return(&m->meta);
 }
 
 
+/*
+ * Frees volatile resources (parse tree, meta-data, fields).
+ */
 static void
 mdoc_free1(struct mdoc *mdoc)
 {
 
 	if (mdoc->first)
-		mdoc_node_freelist(mdoc->first);
+		mdoc_node_delete(mdoc, mdoc->first);
 	if (mdoc->meta.title)
 		free(mdoc->meta.title);
 	if (mdoc->meta.os)
@@ -129,289 +139,191 @@ mdoc_free1(struct mdoc *mdoc)
 		free(mdoc->meta.arch);
 	if (mdoc->meta.vol)
 		free(mdoc->meta.vol);
+	if (mdoc->meta.msec)
+		free(mdoc->meta.msec);
 }
 
 
-static int
+/*
+ * Allocate all volatile resources (parse tree, meta-data, fields).
+ */
+static void
 mdoc_alloc1(struct mdoc *mdoc)
 {
 
-	bzero(&mdoc->meta, sizeof(struct mdoc_meta));
+	memset(&mdoc->meta, 0, sizeof(struct mdoc_meta));
 	mdoc->flags = 0;
-	mdoc->lastnamed = mdoc->lastsec = 0;
-	mdoc->last = calloc(1, sizeof(struct mdoc_node));
-	if (NULL == mdoc->last)
-		return(0);
-
+	mdoc->lastnamed = mdoc->lastsec = SEC_NONE;
+	mdoc->last = mandoc_calloc(1, sizeof(struct mdoc_node));
 	mdoc->first = mdoc->last;
 	mdoc->last->type = MDOC_ROOT;
 	mdoc->next = MDOC_NEXT_CHILD;
-	return(1);
 }
 
 
 /*
- * Free up all resources contributed by a parse:  the node tree,
- * meta-data and so on.  Then reallocate the root node for another
- * parse.
+ * Free up volatile resources (see mdoc_free1()) then re-initialises the
+ * data with mdoc_alloc1().  After invocation, parse data has been reset
+ * and the parser is ready for re-invocation on a new tree; however,
+ * cross-parse non-volatile data is kept intact.
  */
-int
+void
 mdoc_reset(struct mdoc *mdoc)
 {
 
 	mdoc_free1(mdoc);
-	return(mdoc_alloc1(mdoc));
+	mdoc_alloc1(mdoc);
 }
 
 
 /*
- * Completely free up all resources.
+ * Completely free up all volatile and non-volatile parse resources.
+ * After invocation, the pointer is no longer usable.
  */
 void
 mdoc_free(struct mdoc *mdoc)
 {
 
 	mdoc_free1(mdoc);
-	if (mdoc->htab)
-		mdoc_hash_free(mdoc->htab);
 	free(mdoc);
 }
 
 
+/*
+ * Allocate volatile and non-volatile parse resources.  
+ */
 struct mdoc *
-mdoc_alloc(void *data, int pflags, const struct mdoc_cb *cb)
+mdoc_alloc(struct regset *regs, void *data, mandocmsg msg)
 {
 	struct mdoc	*p;
 
-	if (NULL == (p = calloc(1, sizeof(struct mdoc))))
-		return(NULL);
-	if (cb)
-		(void)memcpy(&p->cb, cb, sizeof(struct mdoc_cb));
+	p = mandoc_calloc(1, sizeof(struct mdoc));
 
+	p->msg = msg;
 	p->data = data;
-	p->pflags = pflags;
+	p->regs = regs;
 
-	if (NULL == (p->htab = mdoc_hash_alloc())) {
-		free(p);
-		return(NULL);
-	} else if (mdoc_alloc1(p))
-		return(p);
-
-	free(p);
-	return(NULL);
+	mdoc_hash_init();
+	mdoc_alloc1(p);
+	return(p);
 }
 
 
 /*
  * Climb back up the parse tree, validating open scopes.  Mostly calls
- * through to macro_end in macro.c.
+ * through to macro_end() in macro.c.
  */
 int
 mdoc_endparse(struct mdoc *m)
 {
 
-	if (MDOC_HALT & m->flags)
-		return(0);
-	else if (mdoc_macroend(m))
+	assert( ! (MDOC_HALT & m->flags));
+	if (mdoc_macroend(m))
 		return(1);
 	m->flags |= MDOC_HALT;
 	return(0);
 }
 
-
-/*
- * Main parse routine.  Parses a single line -- really just hands off to
- * the macro or text parser.
- */
 int
-mdoc_parseln(struct mdoc *m, int ln, char *buf)
+mdoc_addspan(struct mdoc *m, const struct tbl_span *sp)
 {
 
-	if (MDOC_HALT & m->flags)
-		return(0);
+	assert( ! (MDOC_HALT & m->flags));
 
-	return('.' == *buf ? parsemacro(m, ln, buf) :
-			parsetext(m, ln, buf));
-}
+	/* No text before an initial macro. */
 
+	if (SEC_NONE == m->lastnamed) {
+		/* FIXME: grab from span. */
+		mdoc_pmsg(m, 0, 0, MANDOCERR_NOTEXT);
+		return(1);
+	}
 
-int
-mdoc_verr(struct mdoc *mdoc, int ln, int pos, 
-		const char *fmt, ...)
-{
-	char		 buf[256];
-	va_list		 ap;
-
-	if (NULL == mdoc->cb.mdoc_err)
-		return(0);
-
-	va_start(ap, fmt);
-	(void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
-	va_end(ap);
-	return((*mdoc->cb.mdoc_err)(mdoc->data, ln, pos, buf));
+	return(mdoc_span_alloc(m, sp));
 }
 
 
+/*
+ * Main parse routine.  Parses a single line -- really just hands off to
+ * the macro (mdoc_pmacro()) or text parser (mdoc_ptext()).
+ */
 int
-mdoc_vwarn(struct mdoc *mdoc, int ln, int pos, 
-		enum mdoc_warn type, const char *fmt, ...)
+mdoc_parseln(struct mdoc *m, int ln, char *buf, int offs)
 {
-	char		 buf[256];
-	va_list		 ap;
 
-	if (NULL == mdoc->cb.mdoc_warn)
-		return(0);
+	assert( ! (MDOC_HALT & m->flags));
 
-	va_start(ap, fmt);
-	(void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
-	va_end(ap);
-	return((*mdoc->cb.mdoc_warn)(mdoc->data, ln, pos, type, buf));
-}
+	m->flags |= MDOC_NEWLINE;
 
+	/*
+	 * Let the roff nS register switch SYNOPSIS mode early,
+	 * such that the parser knows at all times
+	 * whether this mode is on or off.
+	 * Note that this mode is also switched by the Sh macro.
+	 */
+	if (m->regs->regs[(int)REG_nS].set) {
+		if (m->regs->regs[(int)REG_nS].v.u)
+			m->flags |= MDOC_SYNOPSIS;
+		else
+			m->flags &= ~MDOC_SYNOPSIS;
+	}
 
-int
-mdoc_nerr(struct mdoc *mdoc, const struct mdoc_node *node, 
-		const char *fmt, ...)
-{
-	char		 buf[256];
-	va_list		 ap;
-
-	if (NULL == mdoc->cb.mdoc_err)
-		return(0);
-
-	va_start(ap, fmt);
-	(void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
-	va_end(ap);
-	return((*mdoc->cb.mdoc_err)(mdoc->data, 
-				node->line, node->pos, buf));
+	return(('.' == buf[offs] || '\'' == buf[offs]) ? 
+			mdoc_pmacro(m, ln, buf, offs) :
+			mdoc_ptext(m, ln, buf, offs));
 }
 
 
 int
-mdoc_warn(struct mdoc *mdoc, enum mdoc_warn type, 
-		const char *fmt, ...)
+mdoc_vmsg(struct mdoc *mdoc, enum mandocerr t, 
+		int ln, int pos, const char *fmt, ...)
 {
 	char		 buf[256];
 	va_list		 ap;
 
-	if (NULL == mdoc->cb.mdoc_warn)
-		return(0);
-
 	va_start(ap, fmt);
-	(void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
+	vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 	va_end(ap);
-	return((*mdoc->cb.mdoc_warn)(mdoc->data, mdoc->last->line,
-				mdoc->last->pos, type, buf));
-}
 
-
-int
-mdoc_err(struct mdoc *mdoc, const char *fmt, ...)
-{
-	char		 buf[256];
-	va_list		 ap;
-
-	if (NULL == mdoc->cb.mdoc_err)
-		return(0);
-
-	va_start(ap, fmt);
-	(void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
-	va_end(ap);
-	return((*mdoc->cb.mdoc_err)(mdoc->data, mdoc->last->line,
-				mdoc->last->pos, buf));
+	return((*mdoc->msg)(t, mdoc->data, ln, pos, buf));
 }
 
 
 int
-mdoc_pwarn(struct mdoc *mdoc, int line, int pos, enum mdoc_warn type,
-		const char *fmt, ...)
+mdoc_macro(MACRO_PROT_ARGS)
 {
-	char		 buf[256];
-	va_list		 ap;
+	assert(tok < MDOC_MAX);
 
-	if (NULL == mdoc->cb.mdoc_warn)
-		return(0);
+	/* If we're in the body, deny prologue calls. */
 
-	va_start(ap, fmt);
-	(void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
-	va_end(ap);
-	return((*mdoc->cb.mdoc_warn)(mdoc->data, 
-				line, pos, type, buf));
-}
-
-int
-mdoc_perr(struct mdoc *mdoc, int line, int pos, const char *fmt, ...)
-{
-	char		 buf[256];
-	va_list		 ap;
-
-	if (NULL == mdoc->cb.mdoc_err)
-		return(0);
-
-	va_start(ap, fmt);
-	(void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
-	va_end(ap);
-	return((*mdoc->cb.mdoc_err)(mdoc->data, line, pos, buf));
-}
-
-
-int
-mdoc_macro(struct mdoc *m, int tok, 
-		int ln, int pp, int *pos, char *buf)
-{
-
-	/* FIXME - these should happen during validation. */
-
 	if (MDOC_PROLOGUE & mdoc_macros[tok].flags && 
-			SEC_PROLOGUE != m->lastnamed)
-		return(perr(m, ln, pp, EPROLBODY));
+			MDOC_PBODY & m->flags) {
+		mdoc_pmsg(m, line, ppos, MANDOCERR_BADBODY);
+		return(1);
+	}
 
+	/* If we're in the prologue, deny "body" macros.  */
+
 	if ( ! (MDOC_PROLOGUE & mdoc_macros[tok].flags) && 
-			SEC_PROLOGUE == m->lastnamed)
-		return(perr(m, ln, pp, EBODYPROL));
+			! (MDOC_PBODY & m->flags)) {
+		mdoc_pmsg(m, line, ppos, MANDOCERR_BADPROLOG);
+		if (NULL == m->meta.msec)
+			m->meta.msec = mandoc_strdup("1");
+		if (NULL == m->meta.title)
+			m->meta.title = mandoc_strdup("UNKNOWN");
+		if (NULL == m->meta.vol)
+			m->meta.vol = mandoc_strdup("LOCAL");
+		if (NULL == m->meta.os)
+			m->meta.os = mandoc_strdup("LOCAL");
+		if (0 == m->meta.date)
+			m->meta.date = time(NULL);
+		m->flags |= MDOC_PBODY;
+	}
 
-	if (1 != pp && ! (MDOC_CALLABLE & mdoc_macros[tok].flags))
-		return(perr(m, ln, pp, ENOCALL));
-
-	return((*mdoc_macros[tok].fp)(m, tok, ln, pp, pos, buf));
+	return((*mdoc_macros[tok].fp)(m, tok, line, ppos, pos, buf));
 }
 
 
 static int
-perr(struct mdoc *m, int line, int pos, enum merr type)
-{
-	char		*p;
-
-	p = NULL;
-	switch (type) {
-	case (ENOCALL):
-		p = "not callable";
-		break;
-	case (EPROLBODY):
-		p = "macro disallowed in document body";
-		break;
-	case (EBODYPROL):
-		p = "macro disallowed in document prologue";
-		break;
-	case (EMALLOC):
-		p = "memory exhausted";
-		break;
-	case (ETEXTPROL):
-		p = "text disallowed in document prologue";
-		break;
-	case (ENOBLANK):
-		p = "blank lines disallowed in non-literal contexts";
-		break;
-	case (ESPACE):
-		p = "whitespace disallowed after delimiter";
-		break;
-	}
-	assert(p);
-	return(mdoc_perr(m, line, pos, p));
-}
-
-
-static int
 node_append(struct mdoc *mdoc, struct mdoc_node *p)
 {
 
@@ -434,10 +346,27 @@ node_append(struct mdoc *mdoc, struct mdoc_node *p)
 		/* NOTREACHED */
 	}
 
+	p->parent->nchild++;
+
+	/*
+	 * Copy over the normalised-data pointer of our parent.  Not
+	 * everybody has one, but copying a null pointer is fine.
+	 */
+
+	switch (p->type) {
+	case (MDOC_BODY):
+		/* FALLTHROUGH */
+	case (MDOC_TAIL):
+		/* FALLTHROUGH */
+	case (MDOC_HEAD):
+		p->norm = p->parent->norm;
+		break;
+	default:
+		break;
+	}
+
 	if ( ! mdoc_valid_pre(mdoc, p))
 		return(0);
-	if ( ! mdoc_action_pre(mdoc, p))
-		return(0);
 
 	switch (p->type) {
 	case (MDOC_HEAD):
@@ -449,6 +378,8 @@ node_append(struct mdoc *mdoc, struct mdoc_node *p)
 		p->parent->tail = p;
 		break;
 	case (MDOC_BODY):
+		if (p->end)
+			break;
 		assert(MDOC_BLOCK == p->parent->type);
 		p->parent->body = p;
 		break;
@@ -459,11 +390,11 @@ node_append(struct mdoc *mdoc, struct mdoc_node *p)
 	mdoc->last = p;
 
 	switch (p->type) {
+	case (MDOC_TBL):
+		/* FALLTHROUGH */
 	case (MDOC_TEXT):
 		if ( ! mdoc_valid_post(mdoc))
 			return(0);
-		if ( ! mdoc_action_post(mdoc))
-			return(0);
 		break;
 	default:
 		break;
@@ -474,121 +405,193 @@ node_append(struct mdoc *mdoc, struct mdoc_node *p)
 
 
 static struct mdoc_node *
-node_alloc(struct mdoc *mdoc, int line, 
-		int pos, int tok, enum mdoc_type type)
+node_alloc(struct mdoc *m, int line, int pos, 
+		enum mdoct tok, enum mdoc_type type)
 {
 	struct mdoc_node *p;
 
-	if (NULL == (p = calloc(1, sizeof(struct mdoc_node)))) {
-		(void)perr(mdoc, (mdoc)->last->line, 
-				(mdoc)->last->pos, EMALLOC);
-		return(NULL);
-	}
-
-	p->sec = mdoc->lastsec;
+	p = mandoc_calloc(1, sizeof(struct mdoc_node));
+	p->sec = m->lastsec;
 	p->line = line;
 	p->pos = pos;
 	p->tok = tok;
-	if (MDOC_TEXT != (p->type = type))
-		assert(p->tok >= 0);
+	p->type = type;
 
+	/* Flag analysis. */
+
+	if (MDOC_SYNOPSIS & m->flags)
+		p->flags |= MDOC_SYNPRETTY;
+	else
+		p->flags &= ~MDOC_SYNPRETTY;
+	if (MDOC_NEWLINE & m->flags)
+		p->flags |= MDOC_LINE;
+	m->flags &= ~MDOC_NEWLINE;
+
 	return(p);
 }
 
 
 int
-mdoc_tail_alloc(struct mdoc *mdoc, int line, int pos, int tok)
+mdoc_tail_alloc(struct mdoc *m, int line, int pos, enum mdoct tok)
 {
 	struct mdoc_node *p;
 
-	p = node_alloc(mdoc, line, pos, tok, MDOC_TAIL);
-	if (NULL == p)
+	p = node_alloc(m, line, pos, tok, MDOC_TAIL);
+	if ( ! node_append(m, p))
 		return(0);
-	return(node_append(mdoc, p));
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
-mdoc_head_alloc(struct mdoc *mdoc, int line, int pos, int tok)
+mdoc_head_alloc(struct mdoc *m, int line, int pos, enum mdoct tok)
 {
 	struct mdoc_node *p;
 
-	assert(mdoc->first);
-	assert(mdoc->last);
+	assert(m->first);
+	assert(m->last);
 
-	p = node_alloc(mdoc, line, pos, tok, MDOC_HEAD);
-	if (NULL == p)
+	p = node_alloc(m, line, pos, tok, MDOC_HEAD);
+	if ( ! node_append(m, p))
 		return(0);
-	return(node_append(mdoc, p));
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
-mdoc_body_alloc(struct mdoc *mdoc, int line, int pos, int tok)
+mdoc_body_alloc(struct mdoc *m, int line, int pos, enum mdoct tok)
 {
 	struct mdoc_node *p;
 
-	p = node_alloc(mdoc, line, pos, tok, MDOC_BODY);
-	if (NULL == p)
+	p = node_alloc(m, line, pos, tok, MDOC_BODY);
+	if ( ! node_append(m, p))
 		return(0);
-	return(node_append(mdoc, p));
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
-mdoc_block_alloc(struct mdoc *mdoc, int line, int pos, 
-		int tok, struct mdoc_arg *args)
+mdoc_endbody_alloc(struct mdoc *m, int line, int pos, enum mdoct tok,
+		struct mdoc_node *body, enum mdoc_endbody end)
 {
 	struct mdoc_node *p;
 
-	p = node_alloc(mdoc, line, pos, tok, MDOC_BLOCK);
-	if (NULL == p)
+	p = node_alloc(m, line, pos, tok, MDOC_BODY);
+	p->pending = body;
+	p->end = end;
+	if ( ! node_append(m, p))
 		return(0);
+	m->next = MDOC_NEXT_SIBLING;
+	return(1);
+}
+
+
+int
+mdoc_block_alloc(struct mdoc *m, int line, int pos, 
+		enum mdoct tok, struct mdoc_arg *args)
+{
+	struct mdoc_node *p;
+
+	p = node_alloc(m, line, pos, tok, MDOC_BLOCK);
 	p->args = args;
 	if (p->args)
 		(args->refcnt)++;
-	return(node_append(mdoc, p));
+
+	switch (tok) {
+	case (MDOC_Bd):
+		/* FALLTHROUGH */
+	case (MDOC_Bf):
+		/* FALLTHROUGH */
+	case (MDOC_Bl):
+		/* FALLTHROUGH */
+	case (MDOC_Rs):
+		p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
+		break;
+	default:
+		break;
+	}
+
+	if ( ! node_append(m, p))
+		return(0);
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
-mdoc_elem_alloc(struct mdoc *mdoc, int line, int pos, 
-		int tok, struct mdoc_arg *args)
+mdoc_elem_alloc(struct mdoc *m, int line, int pos, 
+		enum mdoct tok, struct mdoc_arg *args)
 {
 	struct mdoc_node *p;
 
-	p = node_alloc(mdoc, line, pos, tok, MDOC_ELEM);
-	if (NULL == p)
-		return(0);
+	p = node_alloc(m, line, pos, tok, MDOC_ELEM);
 	p->args = args;
 	if (p->args)
 		(args->refcnt)++;
-	return(node_append(mdoc, p));
+
+	switch (tok) {
+	case (MDOC_An):
+		p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
+		break;
+	default:
+		break;
+	}
+
+	if ( ! node_append(m, p))
+		return(0);
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
+static int
+mdoc_span_alloc(struct mdoc *m, const struct tbl_span *sp)
+{
+	struct mdoc_node *n;
 
+	/* FIXME: grab from tbl_span. */
+	n = node_alloc(m, 0, 0, MDOC_MAX, MDOC_TBL);
+	n->span = sp;
+
+	if ( ! node_append(m, n))
+		return(0);
+
+	m->next = MDOC_NEXT_SIBLING;
+	return(1);
+}
+
+
 int
-mdoc_word_alloc(struct mdoc *mdoc, 
-		int line, int pos, const char *word)
+mdoc_word_alloc(struct mdoc *m, int line, int pos, const char *p)
 {
-	struct mdoc_node *p;
+	struct mdoc_node *n;
+	size_t		  sv, len;
 
-	p = node_alloc(mdoc, line, pos, -1, MDOC_TEXT);
-	if (NULL == p)
+	len = strlen(p);
+
+	n = node_alloc(m, line, pos, MDOC_MAX, MDOC_TEXT);
+	n->string = mandoc_malloc(len + 1);
+	sv = strlcpy(n->string, p, len + 1);
+
+	/* Prohibit truncation. */
+	assert(sv < len + 1);
+
+	if ( ! node_append(m, n))
 		return(0);
-	if (NULL == (p->string = strdup(word))) {
-		(void)perr(mdoc, (mdoc)->last->line, 
-				(mdoc)->last->pos, EMALLOC);
-		return(0);
-	}
-	return(node_append(mdoc, p));
+
+	m->next = MDOC_NEXT_SIBLING;
+	return(1);
 }
 
 
-void
+static void
 mdoc_node_free(struct mdoc_node *p)
 {
 
+	if (MDOC_BLOCK == p->type || MDOC_ELEM == p->type)
+		free(p->norm);
 	if (p->string)
 		free(p->string);
 	if (p->args)
@@ -597,15 +600,55 @@ mdoc_node_free(struct mdoc_node *p)
 }
 
 
+static void
+mdoc_node_unlink(struct mdoc *m, struct mdoc_node *n)
+{
+
+	/* Adjust siblings. */
+
+	if (n->prev)
+		n->prev->next = n->next;
+	if (n->next)
+		n->next->prev = n->prev;
+
+	/* Adjust parent. */
+
+	if (n->parent) {
+		n->parent->nchild--;
+		if (n->parent->child == n)
+			n->parent->child = n->prev ? n->prev : n->next;
+		if (n->parent->last == n)
+			n->parent->last = n->prev ? n->prev : NULL;
+	}
+
+	/* Adjust parse point, if applicable. */
+
+	if (m && m->last == n) {
+		if (n->prev) {
+			m->last = n->prev;
+			m->next = MDOC_NEXT_SIBLING;
+		} else {
+			m->last = n->parent;
+			m->next = MDOC_NEXT_CHILD;
+		}
+	}
+
+	if (m && m->first == n)
+		m->first = NULL;
+}
+
+
 void
-mdoc_node_freelist(struct mdoc_node *p)
+mdoc_node_delete(struct mdoc *m, struct mdoc_node *p)
 {
 
-	if (p->child)
-		mdoc_node_freelist(p->child);
-	if (p->next)
-		mdoc_node_freelist(p->next);
+	while (p->child) {
+		assert(p->nchild);
+		mdoc_node_delete(m, p->child);
+	}
+	assert(0 == p->nchild);
 
+	mdoc_node_unlink(m, p);
 	mdoc_node_free(p);
 }
 
@@ -615,33 +658,135 @@ mdoc_node_freelist(struct mdoc_node *p)
  * control character.
  */
 static int
-parsetext(struct mdoc *m, int line, char *buf)
+mdoc_ptext(struct mdoc *m, int line, char *buf, int offs)
 {
+	char		 *c, *ws, *end;
+	struct mdoc_node *n;
 
-	if (SEC_PROLOGUE == m->lastnamed)
-		return(perr(m, line, 0, ETEXTPROL));
+	/* Ignore bogus comments. */
 
-	if (0 == buf[0] && ! (MDOC_LITERAL & m->flags))
-		return(perr(m, line, 0, ENOBLANK));
+	if ('\\' == buf[offs] && 
+			'.' == buf[offs + 1] && 
+			'"' == buf[offs + 2]) {
+		mdoc_pmsg(m, line, offs, MANDOCERR_BADCOMMENT);
+		return(1);
+	}
 
-	if ( ! mdoc_word_alloc(m, line, 0, buf))
+	/* No text before an initial macro. */
+
+	if (SEC_NONE == m->lastnamed) {
+		mdoc_pmsg(m, line, offs, MANDOCERR_NOTEXT);
+		return(1);
+	}
+
+	assert(m->last);
+	n = m->last;
+
+	/*
+	 * Divert directly to list processing if we're encountering a
+	 * columnar MDOC_BLOCK with or without a prior MDOC_BLOCK entry
+	 * (a MDOC_BODY means it's already open, in which case we should
+	 * process within its context in the normal way).
+	 */
+
+	if (MDOC_Bl == n->tok && MDOC_BODY == n->type &&
+			LIST_column == n->norm->Bl.type) {
+		/* `Bl' is open without any children. */
+		m->flags |= MDOC_FREECOL;
+		return(mdoc_macro(m, MDOC_It, line, offs, &offs, buf));
+	}
+
+	if (MDOC_It == n->tok && MDOC_BLOCK == n->type &&
+			NULL != n->parent &&
+			MDOC_Bl == n->parent->tok &&
+			LIST_column == n->parent->norm->Bl.type) {
+		/* `Bl' has block-level `It' children. */
+		m->flags |= MDOC_FREECOL;
+		return(mdoc_macro(m, MDOC_It, line, offs, &offs, buf));
+	}
+
+	/*
+	 * Search for the beginning of unescaped trailing whitespace (ws)
+	 * and for the first character not to be output (end).
+	 */
+
+	/* FIXME: replace with strcspn(). */
+	ws = NULL;
+	for (c = end = buf + offs; *c; c++) {
+		switch (*c) {
+		case '-':
+			if (mandoc_hyph(buf + offs, c))
+				*c = ASCII_HYPH;
+			ws = NULL;
+			break;
+		case ' ':
+			if (NULL == ws)
+				ws = c;
+			continue;
+		case '\t':
+			/*
+			 * Always warn about trailing tabs,
+			 * even outside literal context,
+			 * where they should be put on the next line.
+			 */
+			if (NULL == ws)
+				ws = c;
+			/*
+			 * Strip trailing tabs in literal context only;
+			 * outside, they affect the next line.
+			 */
+			if (MDOC_LITERAL & m->flags)
+				continue;
+			break;
+		case '\\':
+			/* Skip the escaped character, too, if any. */
+			if (c[1])
+				c++;
+			/* FALLTHROUGH */
+		default:
+			ws = NULL;
+			break;
+		}
+		end = c + 1;
+	}
+	*end = '\0';
+
+	if (ws)
+		mdoc_pmsg(m, line, (int)(ws-buf), MANDOCERR_EOLNSPACE);
+
+	if ('\0' == buf[offs] && ! (MDOC_LITERAL & m->flags)) {
+		mdoc_pmsg(m, line, (int)(c-buf), MANDOCERR_NOBLANKLN);
+
+		/*
+		 * Insert a `sp' in the case of a blank line.  Technically,
+		 * blank lines aren't allowed, but enough manuals assume this
+		 * behaviour that we want to work around it.
+		 */
+		if ( ! mdoc_elem_alloc(m, line, offs, MDOC_sp, NULL))
+			return(0);
+
+		m->next = MDOC_NEXT_SIBLING;
+		return(1);
+	}
+
+	if ( ! mdoc_word_alloc(m, line, offs, buf+offs))
 		return(0);
 
-	m->next = MDOC_NEXT_SIBLING;
-	return(1);
-}
+	if (MDOC_LITERAL & m->flags)
+		return(1);
 
+	/*
+	 * End-of-sentence check.  If the last character is an unescaped
+	 * EOS character, then flag the node as being the end of a
+	 * sentence.  The front-end will know how to interpret this.
+	 */
 
-static int
-macrowarn(struct mdoc *m, int ln, const char *buf)
-{
-	if ( ! (MDOC_IGN_MACRO & m->pflags))
-		return(mdoc_perr(m, ln, 1, 
-				"unknown macro: %s%s", 
-				buf, strlen(buf) > 3 ? "..." : ""));
-	return(mdoc_pwarn(m, ln, 1, WARN_SYNTAX,
-				"unknown macro: %s%s",
-				buf, strlen(buf) > 3 ? "..." : ""));
+	assert(buf < end);
+
+	if (mandoc_eos(buf+offs, (size_t)(end-buf-offs), 0))
+		m->last->flags |= MDOC_EOS;
+
+	return(1);
 }
 
 
@@ -649,57 +794,115 @@ macrowarn(struct mdoc *m, int ln, const char *buf)
  * Parse a macro line, that is, a line beginning with the control
  * character.
  */
-int
-parsemacro(struct mdoc *m, int ln, char *buf)
+static int
+mdoc_pmacro(struct mdoc *m, int ln, char *buf, int offs)
 {
-	int		  i, c;
+	enum mdoct	  tok;
+	int		  i, j, sv;
 	char		  mac[5];
+	struct mdoc_node *n;
 
 	/* Empty lines are ignored. */
 
-	if (0 == buf[1])
+	offs++;
+
+	if ('\0' == buf[offs])
 		return(1);
 
-	if (' ' == buf[1]) {
-		i = 2;
-		while (buf[i] && ' ' == buf[i])
+	i = offs;
+
+	/* Accept tabs/whitespace after the initial control char. */
+
+	if (' ' == buf[i] || '\t' == buf[i]) {
+		i++;
+		while (buf[i] && (' ' == buf[i] || '\t' == buf[i]))
 			i++;
-		if (0 == buf[i])
+		if ('\0' == buf[i])
 			return(1);
-		return(perr(m, ln, 1, ESPACE));
 	}
 
-	/* Copy the first word into a nil-terminated buffer. */
+	sv = i;
 
-	for (i = 1; i < 5; i++) {
-		if (0 == (mac[i - 1] = buf[i]))
-			break;
-		else if (' ' == buf[i])
-			break;
+	/* 
+	 * Copy the first word into a nil-terminated buffer.
+	 * Stop copying when a tab, space, or eoln is encountered.
+	 */
+
+	j = 0;
+	while (j < 4 && '\0' != buf[i] && ' ' != buf[i] && '\t' != buf[i])
+		mac[j++] = buf[i++];
+	mac[j] = '\0';
+
+	tok = (j > 1 || j < 4) ? mdoc_hash_find(mac) : MDOC_MAX;
+	if (MDOC_MAX == tok) {
+		mdoc_vmsg(m, MANDOCERR_MACRO, ln, sv, "%s", buf + sv - 1);
+		return(1);
 	}
 
-	mac[i - 1] = 0;
+	/* Disregard the first trailing tab, if applicable. */
 
-	if (i == 5 || i <= 2) {
-		if ( ! macrowarn(m, ln, mac))
+	if ('\t' == buf[i])
+		i++;
+
+	/* Jump to the next non-whitespace word. */
+
+	while (buf[i] && ' ' == buf[i])
+		i++;
+
+	/* 
+	 * Trailing whitespace.  Note that tabs are allowed to be passed
+	 * into the parser as "text", so we only warn about spaces here.
+	 */
+
+	if ('\0' == buf[i] && ' ' == buf[i - 1])
+		mdoc_pmsg(m, ln, i - 1, MANDOCERR_EOLNSPACE);
+
+	/*
+	 * If an initial macro or a list invocation, divert directly
+	 * into macro processing.
+	 */
+
+	if (NULL == m->last || MDOC_It == tok || MDOC_El == tok) {
+		if ( ! mdoc_macro(m, tok, ln, sv, &i, buf)) 
 			goto err;
 		return(1);
-	} 
-	
-	if (MDOC_MAX == (c = mdoc_hash_find(m->htab, mac))) {
-		if ( ! macrowarn(m, ln, mac))
+	}
+
+	n = m->last;
+	assert(m->last);
+
+	/*
+	 * If the first macro of a `Bl -column', open an `It' block
+	 * context around the parsed macro.
+	 */
+
+	if (MDOC_Bl == n->tok && MDOC_BODY == n->type &&
+			LIST_column == n->norm->Bl.type) {
+		m->flags |= MDOC_FREECOL;
+		if ( ! mdoc_macro(m, MDOC_It, ln, sv, &sv, buf))
 			goto err;
 		return(1);
 	}
 
-	/* The macro is sane.  Jump to the next word. */
+	/*
+	 * If we're following a block-level `It' within a `Bl -column'
+	 * context (perhaps opened in the above block or in ptext()),
+	 * then open an `It' block context around the parsed macro.
+	 */
 
-	while (buf[i] && ' ' == buf[i])
-		i++;
+	if (MDOC_It == n->tok && MDOC_BLOCK == n->type &&
+			NULL != n->parent &&
+			MDOC_Bl == n->parent->tok &&
+			LIST_column == n->parent->norm->Bl.type) {
+		m->flags |= MDOC_FREECOL;
+		if ( ! mdoc_macro(m, MDOC_It, ln, sv, &sv, buf)) 
+			goto err;
+		return(1);
+	}
 
-	/* Begin recursive parse sequence. */
+	/* Normal processing of a macro. */
 
-	if ( ! mdoc_macro(m, c, ln, 1, &i, buf)) 
+	if ( ! mdoc_macro(m, tok, ln, sv, &i, buf)) 
 		goto err;
 
 	return(1);
@@ -709,3 +912,5 @@ err:	/* Error out. */
 	m->flags |= MDOC_HALT;
 	return(0);
 }
+
+