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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.

/*	$OpenBSD$	*/
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 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.
 */

struct	mdoc_arg;
union	mdoc_data;

enum	roff_sec {
	SEC_NONE = 0,
	SEC_NAME,
	SEC_LIBRARY,
	SEC_SYNOPSIS,
	SEC_DESCRIPTION,
	SEC_CONTEXT,
	SEC_IMPLEMENTATION,	/* IMPLEMENTATION NOTES */
	SEC_RETURN_VALUES,
	SEC_ENVIRONMENT,
	SEC_FILES,
	SEC_EXIT_STATUS,
	SEC_EXAMPLES,
	SEC_DIAGNOSTICS,
	SEC_COMPATIBILITY,
	SEC_ERRORS,
	SEC_SEE_ALSO,
	SEC_STANDARDS,
	SEC_HISTORY,
	SEC_AUTHORS,
	SEC_CAVEATS,
	SEC_BUGS,
	SEC_SECURITY,
	SEC_CUSTOM,
	SEC__MAX
};

enum	roff_type {
	ROFFT_ROOT,
	ROFFT_BLOCK,
	ROFFT_HEAD,
	ROFFT_BODY,
	ROFFT_TAIL,
	ROFFT_ELEM,
	ROFFT_TEXT,
	ROFFT_TBL,
	ROFFT_EQN
};

/*
 * Indicates that a BODY's formatting has ended, but
 * the scope is still open.  Used for badly nested blocks.
 */
enum	mdoc_endbody {
	ENDBODY_NOT = 0,
	ENDBODY_SPACE,	/* Is broken: append a space. */
	ENDBODY_NOSPACE	/* Is broken: don't append a space. */
};

struct	roff_node {
	struct roff_node *parent;  /* Parent AST node. */
	struct roff_node *child;   /* First child AST node. */
	struct roff_node *last;    /* Last child AST node. */
	struct roff_node *next;    /* Sibling AST node. */
	struct roff_node *prev;    /* Prior sibling AST node. */
	struct roff_node *head;    /* BLOCK */
	struct roff_node *body;    /* BLOCK/ENDBODY */
	struct roff_node *tail;    /* BLOCK */
	struct mdoc_arg	 *args;    /* BLOCK/ELEM */
	union mdoc_data	 *norm;    /* Normalized arguments. */
	char		 *string;  /* TEXT */
	const struct tbl_span *span; /* TBL */
	const struct eqn *eqn;	   /* EQN */
	int		  nchild;  /* Number of child nodes. */
	int		  line;    /* Input file line number. */
	int		  pos;     /* Input file column number. */
	int		  tok;     /* Request or macro ID. */
	int		  flags;
#define	MDOC_VALID	 (1 << 0)  /* Has been validated. */
#define	MDOC_ENDED	 (1 << 1)  /* Gone past body end mark. */
#define MDOC_EOS	 (1 << 2)  /* At sentence boundary. */
#define	MDOC_LINE	 (1 << 3)  /* First macro/text on line. */
#define MDOC_SYNPRETTY	 (1 << 4)  /* SYNOPSIS-style formatting. */
#define MDOC_BROKEN	 (1 << 5)  /* Must validate parent when ending. */
#define	MDOC_DELIMO	 (1 << 6)
#define	MDOC_DELIMC	 (1 << 7)
#define	MAN_VALID	  MDOC_VALID
#define	MAN_EOS		  MDOC_EOS
#define	MAN_LINE	  MDOC_LINE
	int		  prev_font; /* Before entering this node. */
	int		  aux;     /* Decoded node data, type-dependent. */
	enum roff_type	  type;    /* AST node type. */
	enum roff_sec	  sec;     /* Current named section. */
	enum mdoc_endbody end;     /* BODY */
};