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Second step towards parser unification:
Replace struct mdoc_node and struct man_node by a unified struct roff_node.
To be able to use the tok member for both mdoc(7) and man(7) without
defining all the macros in roff.h, sacrifice a tiny bit of type safety
and make tok an int rather than an enum.
Almost mechanical, no functional change.
Written on the Eurostar from Bruxelles to London on the way to p2k15.

/*	$Id: libmdoc.h,v 1.98 2015/04/02 22:48:17 schwarze Exp $ */
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2013, 2014, 2015 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
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
 */

enum	mdoc_next {
	MDOC_NEXT_SIBLING = 0,
	MDOC_NEXT_CHILD
};

struct	mdoc {
	struct mparse	 *parse; /* parse pointer */
	const char	 *defos; /* default argument for .Os */
	int		  quick; /* abort parse early */
	int		  flags; /* parse flags */
#define	MDOC_LITERAL	 (1 << 1) /* in a literal scope */
#define	MDOC_PBODY	 (1 << 2) /* in the document body */
#define	MDOC_NEWLINE	 (1 << 3) /* first macro/text in a line */
#define	MDOC_PHRASELIT	 (1 << 4) /* literal within a partila phrase */
#define	MDOC_PPHRASE	 (1 << 5) /* within a partial phrase */
#define	MDOC_FREECOL	 (1 << 6) /* `It' invocation should close */
#define	MDOC_SYNOPSIS	 (1 << 7) /* SYNOPSIS-style formatting */
#define	MDOC_KEEP	 (1 << 8) /* in a word keep */
#define	MDOC_SMOFF	 (1 << 9) /* spacing is off */
#define	MDOC_NODELIMC	 (1 << 10) /* disable closing delimiter handling */
	enum mdoc_next	  next; /* where to put the next node */
	struct roff_node *last; /* the last node parsed */
	struct roff_node *first; /* the first node parsed */
	struct roff_node *last_es; /* the most recent Es node */
	struct mdoc_meta  meta; /* document meta-data */
	enum roff_sec	  lastnamed;
	enum roff_sec	  lastsec;
	struct roff	 *roff;
};

#define	MACRO_PROT_ARGS	struct mdoc *mdoc, \
			int tok, \
			int line, \
			int ppos, \
			int *pos, \
			char *buf

struct	mdoc_macro {
	void		(*fp)(MACRO_PROT_ARGS);
	int		  flags;
#define	MDOC_CALLABLE	 (1 << 0)
#define	MDOC_PARSED	 (1 << 1)
#define	MDOC_EXPLICIT	 (1 << 2)
#define	MDOC_PROLOGUE	 (1 << 3)
#define	MDOC_IGNDELIM	 (1 << 4)
#define	MDOC_JOIN	 (1 << 5)
};

enum	margserr {
	ARGS_ERROR,
	ARGS_EOLN, /* end-of-line */
	ARGS_WORD, /* normal word */
	ARGS_PUNCT, /* series of punctuation */
	ARGS_QWORD, /* quoted word */
	ARGS_PHRASE, /* Ta'd phrase (-column) */
	ARGS_PPHRASE, /* tabbed phrase (-column) */
	ARGS_PEND /* last phrase (-column) */
};

/*
 * A punctuation delimiter is opening, closing, or "middle mark"
 * punctuation.  These govern spacing.
 * Opening punctuation (e.g., the opening parenthesis) suppresses the
 * following space; closing punctuation (e.g., the closing parenthesis)
 * suppresses the leading space; middle punctuation (e.g., the vertical
 * bar) can do either.  The middle punctuation delimiter bends the rules
 * depending on usage.
 */
enum	mdelim {
	DELIM_NONE = 0,
	DELIM_OPEN,
	DELIM_MIDDLE,
	DELIM_CLOSE,
	DELIM_MAX
};

extern	const struct mdoc_macro *const mdoc_macros;

__BEGIN_DECLS

void		  mdoc_macro(MACRO_PROT_ARGS);
void		  mdoc_word_alloc(struct mdoc *, int, int, const char *);
void		  mdoc_word_append(struct mdoc *, const char *);
void		  mdoc_elem_alloc(struct mdoc *, int, int,
			int, struct mdoc_arg *);
struct roff_node *mdoc_block_alloc(struct mdoc *, int, int,
			int, struct mdoc_arg *);
struct roff_node *mdoc_head_alloc(struct mdoc *, int, int, int);
void		  mdoc_tail_alloc(struct mdoc *, int, int, int);
struct roff_node *mdoc_body_alloc(struct mdoc *, int, int, int);
struct roff_node *mdoc_endbody_alloc(struct mdoc *, int, int, int,
			struct roff_node *, enum mdoc_endbody);
void		  mdoc_node_delete(struct mdoc *, struct roff_node *);
void		  mdoc_node_relink(struct mdoc *, struct roff_node *);
void		  mdoc_hash_init(void);
int		  mdoc_hash_find(const char *);
const char	 *mdoc_a2att(const char *);
const char	 *mdoc_a2lib(const char *);
const char	 *mdoc_a2st(const char *);
const char	 *mdoc_a2arch(const char *);
void		  mdoc_valid_pre(struct mdoc *, struct roff_node *);
void		  mdoc_valid_post(struct mdoc *);
void		  mdoc_argv(struct mdoc *, int, int,
			struct mdoc_arg **, int *, char *);
void		  mdoc_argv_free(struct mdoc_arg *);
enum margserr	  mdoc_args(struct mdoc *, int,
			int *, char *, int, char **);
void		  mdoc_macroend(struct mdoc *);
enum mdelim	  mdoc_isdelim(const char *);

__END_DECLS