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If an explicit scope is still open at the end of an input file,
report an ERROR:  We can still render the page by just closing
the open scope, but it is likely that information will be missing
or document structure mangled.
Before, man(7) only reported a WARNING (which is dangerous because
we cannot be sure rendering is correct) and mdoc(7) ran into FATAL
(which is too drastic, there is no reason not to show what we have).
"looks good" kristaps@

/*	$Id: mandoc.h,v 1.19 2010/09/26 20:22:28 schwarze Exp $ */
/*
 * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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 AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
 */
#ifndef MANDOC_H
#define MANDOC_H

/*
 * This contains declarations that are available system-wide.
 */

#define ASCII_NBRSP	 31  /* non-breaking space */
#define	ASCII_HYPH	 30  /* breakable hyphen */

__BEGIN_DECLS

enum	mandoclevel {
	MANDOCLEVEL_OK = 0,
	MANDOCLEVEL_RESERVED,
	MANDOCLEVEL_WARNING,
	MANDOCLEVEL_ERROR,
	MANDOCLEVEL_FATAL,
	MANDOCLEVEL_BADARG,
	MANDOCLEVEL_SYSERR,
	MANDOCLEVEL_MAX
};

enum	mandocerr {
	MANDOCERR_OK,

	MANDOCERR_WARNING, /* ===== end of warnings ===== */

	MANDOCERR_UPPERCASE, /* text should be uppercase */
	MANDOCERR_SECOOO, /* sections out of conventional order */
	MANDOCERR_SECREP, /* section name repeats */
	MANDOCERR_PROLOGOOO, /* out of order prologue */
	MANDOCERR_PROLOGREP, /* repeated prologue entry */
	MANDOCERR_LISTFIRST, /* list type must come first */
	MANDOCERR_BADSTANDARD, /* bad standard */
	MANDOCERR_BADLIB, /* bad library */
	MANDOCERR_BADTAB, /* tab in non-literal context */
	MANDOCERR_BADESCAPE, /* bad escape sequence */
	MANDOCERR_BADQUOTE, /* unterminated quoted string */
	MANDOCERR_NOWIDTHARG, /* argument requires the width argument */
	/* FIXME: merge with MANDOCERR_IGNARGV. */
	MANDOCERR_WIDTHARG, /* superfluous width argument */
	MANDOCERR_IGNARGV, /* ignoring argument */
	MANDOCERR_BADDATE, /* bad date argument */
	MANDOCERR_BADWIDTH, /* bad width argument */
	MANDOCERR_BADMSEC, /* unknown manual section */
	MANDOCERR_SECMSEC, /* section not in conventional manual section */
	MANDOCERR_EOLNSPACE, /* end of line whitespace */
	MANDOCERR_SCOPENEST, /* blocks badly nested */

	MANDOCERR_ERROR, /* ===== end of errors ===== */

	MANDOCERR_NAMESECFIRST, /* NAME section must come first */
	MANDOCERR_BADBOOL, /* bad Boolean value */
	MANDOCERR_CHILD, /* child violates parent syntax */
	MANDOCERR_BADATT, /* bad AT&T symbol */
	MANDOCERR_LISTREP, /* list type repeated */
	MANDOCERR_DISPREP, /* display type repeated */
	MANDOCERR_ARGVREP, /* argument repeated */
	MANDOCERR_NONAME, /* manual name not yet set */
	MANDOCERR_MACROOBS, /* obsolete macro ignored */
	MANDOCERR_MACROEMPTY, /* empty macro ignored */
	MANDOCERR_BADBODY, /* macro not allowed in body */
	MANDOCERR_BADPROLOG, /* macro not allowed in prologue */
	MANDOCERR_BADCHAR, /* bad character */
	MANDOCERR_BADNAMESEC, /* bad NAME section contents */
	MANDOCERR_NOBLANKLN, /* no blank lines */
	MANDOCERR_NOTEXT, /* no text in this context */
	MANDOCERR_BADCOMMENT, /* bad comment style */
	MANDOCERR_MACRO, /* unknown macro will be lost */
	MANDOCERR_LINESCOPE, /* line scope broken */
	MANDOCERR_ARGCOUNT, /* argument count wrong */
	MANDOCERR_NOSCOPE, /* no such block is open */
	MANDOCERR_SCOPEREP, /* scope already open */
	MANDOCERR_SCOPEEXIT, /* scope open on exit */
	/* FIXME: merge following with MANDOCERR_ARGCOUNT */
	MANDOCERR_NOARGS, /* macro requires line argument(s) */
	MANDOCERR_NOBODY, /* macro requires body argument(s) */
	MANDOCERR_NOARGV, /* macro requires argument(s) */
	MANDOCERR_NOTITLE, /* no title in document */
	MANDOCERR_LISTTYPE, /* missing list type */
	MANDOCERR_DISPTYPE, /* missing display type */
	MANDOCERR_FONTTYPE, /* missing font type */
	MANDOCERR_ARGSLOST, /* line argument(s) will be lost */
	MANDOCERR_BODYLOST, /* body argument(s) will be lost */

	MANDOCERR_FATAL, /* ===== end of fatal errors ===== */

	MANDOCERR_COLUMNS, /* column syntax is inconsistent */
	/* FIXME: this should be a MANDOCERR_ERROR */
	MANDOCERR_NESTEDDISP, /* displays may not be nested */
	MANDOCERR_BADDISP, /* unsupported display type */
	MANDOCERR_SCOPEFATAL, /* blocks badly nested */
	MANDOCERR_SYNTNOSCOPE, /* no scope to rewind: syntax violated */
	MANDOCERR_SYNTLINESCOPE, /* line scope broken, syntax violated */
	MANDOCERR_SYNTARGVCOUNT, /* argument count wrong, violates syntax */
	MANDOCERR_SYNTCHILD, /* child violates parent syntax */
	MANDOCERR_SYNTARGCOUNT, /* argument count wrong, violates syntax */
	MANDOCERR_NODOCBODY, /* no document body */
	MANDOCERR_NODOCPROLOG, /* no document prologue */
	MANDOCERR_UTSNAME, /* utsname system call failed */
	MANDOCERR_MEM, /* static buffer exhausted */

	MANDOCERR_MAX
};

enum	regs {
	REG_nS = 0,	/* register: nS */
	REG__MAX
};

/*
 * A single register entity.  If "set" is zero, the value of the
 * register should be the default one, which is per-register.  It's
 * assumed that callers know which type in "v" corresponds to which
 * register value.
 */
struct	reg {
	int		  set; /* whether set or not */
	union {
		unsigned  u; /* unsigned integer */
	} v;
};

/*
 * The primary interface to setting register values is in libroff,
 * although libmdoc and libman from time to time will manipulate
 * registers (such as `.Sh SYNOPSIS' enabling REG_nS).
 */
struct	regset {
	struct reg	  regs[REG__MAX];
};

/*
 * Callback function for warnings, errors, and fatal errors as they
 * occur in the compilers libroff, libmdoc, and libman.
 */
typedef	int		(*mandocmsg)(enum mandocerr, void *,
				int, int, const char *);

__END_DECLS

#endif /*!MANDOC_H*/