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Unified error and warning message system for all of mandoc,
featuring three message levels, as agreed during the mandoc hackathon:
* FATAL parser failure, cannot produce any output from this input file:
  eventually, we hope to convert most of these to ERRORs.
* ERROR, meaning mandoc cannot cope fully with the input syntax and will
  probably lose information or produce structurally garbled output;
  it will try to produce output anyway but exit non-zero at the end,
  which is eventually intended to make the ports infrastructure happy.
* WARNING, meaning you should clean up the input file, but output
  is probably mostly OK, so this will not cause error-exit at the end.
This commit is mostly just converting the old system to the new one; before
the classification will become really reliable, we must check all messages.

In particular,
* set up a new central message string table in main.c
* drop the old message string tables from man.c and mdoc.c
* get rid of the piece-meal merr enums in libman and libmdoc
* reduce number of error/warning functions from 16 to 6 (still a lot...)

While here, handle a few problems more gracefully:
* allow .Rv and .Ex to work without a prior .Nm
* allow .An to ignore extra arguments
* allow undeclared columns in .Bl -column

Written by kristaps@.

/*	$Id: mandoc.h,v 1.3 2010/05/23 22:45:00 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

__BEGIN_DECLS

enum	mandocerr {
	MANDOCERR_OK,
	MANDOCERR_UPPERCASE, /* text should be uppercase */
	MANDOCERR_SECOOO, /* sections out of conentional 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_COLUMNS, /* column syntax is inconsistent */
	MANDOCERR_BADSTANDARD, /* bad standard */
	MANDOCERR_BADLIB, /* bad library */
	MANDOCERR_BADESCAPE, /* bad escape sequence */
	MANDOCERR_BADQUOTE, /* unterminated quoted string */
	MANDOCERR_NOWIDTHARG, /* argument requires the width argument */
	MANDOCERR_WIDTHARG, /* superfluous width argument */
	MANDOCERR_BADDATE, /* bad date argument */
	MANDOCERR_BADWIDTH, /* bad width argument */
	MANDOCERR_BADMSEC, /* unknown manual sction */
	MANDOCERR_SECMSEC, /* section not in conventional manual section */
	MANDOCERR_EOLNSPACE, /* end of line whitespace */
	MANDOCERR_SCOPEEXIT, /* scope open on exit */
#define	MANDOCERR_WARNING	MANDOCERR_SCOPEEXIT

	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_SCOPE, /* scope broken */
	MANDOCERR_ARGCOUNT, /* argument count wrong */
	MANDOCERR_NOSCOPE, /* request scope close w/none open */
	MANDOCERR_SCOPEREP, /* scope already open */
	/* 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_ARGSLOST, /* line argument(s) will be lost */
	MANDOCERR_BODYLOST, /* body argument(s) will be lost */
#define	MANDOCERR_ERROR		MANDOCERR_ARGSLOST

	/* FIXME: this should be a MANDOCERR_ERROR */
	MANDOCERR_FONTTYPE, /* missing font type */
	/* FIXME: this should be a MANDOCERR_ERROR */
	MANDOCERR_DISPTYPE, /* missing display type */
	/* FIXME: this should be a MANDOCERR_ERROR */
	MANDOCERR_LISTTYPE, /* missing list type */
	/* FIXME: this should be a MANDOCERR_ERROR */
	MANDOCERR_NESTEDDISP, /* displays may not be nested */
	MANDOCERR_SYNTNOSCOPE, /* request scope close w/none open */
	MANDOCERR_SYNTSCOPE, /* scope broken, 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, /* memory exhausted */
#define	MANDOCERR_FATAL		MANDOCERR_MEM

	MANDOCERR_MAX
};

typedef	int	(*mandocmsg)(enum mandocerr, 
			void *, int, int, const char *);

__END_DECLS

#endif /*!MANDOC_H*/