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Some high-level block macros have an effect similar to temporarily
suspending no-fill mode during their head.  Model this with an
additional roff parser state flag ROFF_NONOFILL.  That is much
simpler than it would be to save and restore the ROFF_NOFILL flag
itself, in particular since the latter can be switched (with lasting
effect) by the .nf and .fi requests even while its effect is
temporarily suspended.

This commit does not change formatting yet, but prepares for future
formatting simplifications and improvements.

/*	$Id: roff_int.h,v 1.16 2019/01/05 00:36:50 schwarze Exp $	*/
/*
 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2013-2015, 2017-2019 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.
 *
 * Parser internals shared by multiple parsers.
 */

struct	ohash;
struct	roff_node;
struct	roff_meta;
struct	roff;
struct	mdoc_arg;

enum	roff_next {
	ROFF_NEXT_SIBLING = 0,
	ROFF_NEXT_CHILD
};

struct	roff_man {
	struct roff_meta  meta;    /* Public parse results. */
	struct roff	 *roff;    /* Roff parser state data. */
	struct ohash	 *mdocmac; /* Mdoc macro lookup table. */
	struct ohash	 *manmac;  /* Man macro lookup table. */
	const char	 *os_s;    /* Default operating system. */
	struct roff_node *last;    /* The last node parsed. */
	struct roff_node *last_es; /* The most recent Es node. */
	int		  quick;   /* Abort parse early. */
	int		  flags;   /* Parse flags. */
#define	ROFF_NOFILL	 (1 << 1)  /* Fill mode switched off. */
#define	MDOC_PBODY	 (1 << 2)  /* In the document body. */
#define	MDOC_NEWLINE	 (1 << 3)  /* First macro/text in a line. */
#define	MDOC_PHRASE	 (1 << 4)  /* In a Bl -column phrase. */
#define	MDOC_PHRASELIT	 (1 << 5)  /* Literal within a 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. */
#define	MAN_ELINE	 (1 << 11) /* Next-line element scope. */
#define	MAN_BLINE	 (1 << 12) /* Next-line block scope. */
#define	MDOC_PHRASEQF	 (1 << 13) /* Quote first word encountered. */
#define	MDOC_PHRASEQL	 (1 << 14) /* Quote last word of this phrase. */
#define	MDOC_PHRASEQN	 (1 << 15) /* Quote first word of the next phrase. */
#define	ROFF_NONOFILL	 (1 << 16) /* Temporarily suspend no-fill mode. */
#define	MAN_NEWLINE	  MDOC_NEWLINE
	enum roff_sec	  lastsec; /* Last section seen. */
	enum roff_sec	  lastnamed; /* Last standard section seen. */
	enum roff_next	  next;    /* Where to put the next node. */
};


struct roff_node *roff_node_alloc(struct roff_man *, int, int,
			enum roff_type, int);
void		  roff_node_append(struct roff_man *, struct roff_node *);
void		  roff_word_alloc(struct roff_man *, int, int, const char *);
void		  roff_word_append(struct roff_man *, const char *);
void		  roff_elem_alloc(struct roff_man *, int, int, int);
struct roff_node *roff_block_alloc(struct roff_man *, int, int, int);
struct roff_node *roff_head_alloc(struct roff_man *, int, int, int);
struct roff_node *roff_body_alloc(struct roff_man *, int, int, int);
void		  roff_node_unlink(struct roff_man *, struct roff_node *);
void		  roff_node_relink(struct roff_man *, struct roff_node *);
void		  roff_node_free(struct roff_node *);
void		  roff_node_delete(struct roff_man *, struct roff_node *);

struct ohash	 *roffhash_alloc(enum roff_tok, enum roff_tok);
enum roff_tok	  roffhash_find(struct ohash *, const char *, size_t);
void		  roffhash_free(struct ohash *);

void		  roff_state_reset(struct roff_man *);
void		  roff_validate(struct roff_man *);

/*
 * Functions called from roff.c need to be declared here,
 * not in libmdoc.h or libman.h, even if they are specific
 * to either the mdoc(7) or the man(7) parser.
 */

void		  man_breakscope(struct roff_man *, int);
void		  mdoc_argv_free(struct mdoc_arg *);