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Introduce a new mdoc(7) macro .Tg ("tag") to explicitly mark a place
as defining a term.  Please only use it when automatic tagging does
not work.  Manual page authors will not be required to add the new
macro; using it remains optional.  HTML output is still rudimentary
in this version and will be polished later.

Thanks to kn@ for reminding me that i have been considering since
BSDCan 2014 whether something like this might be useful.  Given
that possibilities of making automatic tagging better are running
out and there are still several situations where automatic tagging
cannot do the job, i think the time is now ripe.

Feedback and no objection from millert@; OK espie@ inoguchi@ kn@.

/*	$Id: roff.h,v 1.70 2020/01/19 18:02:00 schwarze Exp $	*/
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2013-2015, 2017-2020 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.
 *
 * Common data types for all syntax trees and related functions.
 */

struct	ohash;
struct	mdoc_arg;
union	mdoc_data;
struct	tbl_span;
struct	eqn_box;

enum	roff_macroset {
	MACROSET_NONE = 0,
	MACROSET_MDOC,
	MACROSET_MAN
};

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_COMMENT,
	ROFFT_TBL,
	ROFFT_EQN
};

enum	roff_tok {
	ROFF_br = 0,
	ROFF_ce,
	ROFF_fi,
	ROFF_ft,
	ROFF_ll,
	ROFF_mc,
	ROFF_nf,
	ROFF_po,
	ROFF_rj,
	ROFF_sp,
	ROFF_ta,
	ROFF_ti,
	ROFF_MAX,
	ROFF_ab,
	ROFF_ad,
	ROFF_af,
	ROFF_aln,
	ROFF_als,
	ROFF_am,
	ROFF_am1,
	ROFF_ami,
	ROFF_ami1,
	ROFF_as,
	ROFF_as1,
	ROFF_asciify,
	ROFF_backtrace,
	ROFF_bd,
	ROFF_bleedat,
	ROFF_blm,
	ROFF_box,
	ROFF_boxa,
	ROFF_bp,
	ROFF_BP,
	ROFF_break,
	ROFF_breakchar,
	ROFF_brnl,
	ROFF_brp,
	ROFF_brpnl,
	ROFF_c2,
	ROFF_cc,
	ROFF_cf,
	ROFF_cflags,
	ROFF_ch,
	ROFF_char,
	ROFF_chop,
	ROFF_class,
	ROFF_close,
	ROFF_CL,
	ROFF_color,
	ROFF_composite,
	ROFF_continue,
	ROFF_cp,
	ROFF_cropat,
	ROFF_cs,
	ROFF_cu,
	ROFF_da,
	ROFF_dch,
	ROFF_Dd,
	ROFF_de,
	ROFF_de1,
	ROFF_defcolor,
	ROFF_dei,
	ROFF_dei1,
	ROFF_device,
	ROFF_devicem,
	ROFF_di,
	ROFF_do,
	ROFF_ds,
	ROFF_ds1,
	ROFF_dwh,
	ROFF_dt,
	ROFF_ec,
	ROFF_ecr,
	ROFF_ecs,
	ROFF_el,
	ROFF_em,
	ROFF_EN,
	ROFF_eo,
	ROFF_EP,
	ROFF_EQ,
	ROFF_errprint,
	ROFF_ev,
	ROFF_evc,
	ROFF_ex,
	ROFF_fallback,
	ROFF_fam,
	ROFF_fc,
	ROFF_fchar,
	ROFF_fcolor,
	ROFF_fdeferlig,
	ROFF_feature,
	ROFF_fkern,
	ROFF_fl,
	ROFF_flig,
	ROFF_fp,
	ROFF_fps,
	ROFF_fschar,
	ROFF_fspacewidth,
	ROFF_fspecial,
	ROFF_ftr,
	ROFF_fzoom,
	ROFF_gcolor,
	ROFF_hc,
	ROFF_hcode,
	ROFF_hidechar,
	ROFF_hla,
	ROFF_hlm,
	ROFF_hpf,
	ROFF_hpfa,
	ROFF_hpfcode,
	ROFF_hw,
	ROFF_hy,
	ROFF_hylang,
	ROFF_hylen,
	ROFF_hym,
	ROFF_hypp,
	ROFF_hys,
	ROFF_ie,
	ROFF_if,
	ROFF_ig,
	/* MAN_in; ignored in mdoc(7) */
	ROFF_index,
	ROFF_it,
	ROFF_itc,
	ROFF_IX,
	ROFF_kern,
	ROFF_kernafter,
	ROFF_kernbefore,
	ROFF_kernpair,
	ROFF_lc,
	ROFF_lc_ctype,
	ROFF_lds,
	ROFF_length,
	ROFF_letadj,
	ROFF_lf,
	ROFF_lg,
	ROFF_lhang,
	ROFF_linetabs,
	ROFF_lnr,
	ROFF_lnrf,
	ROFF_lpfx,
	ROFF_ls,
	ROFF_lsm,
	ROFF_lt,
	ROFF_mediasize,
	ROFF_minss,
	ROFF_mk,
	ROFF_mso,
	ROFF_na,
	ROFF_ne,
	ROFF_nh,
	ROFF_nhychar,
	ROFF_nm,
	ROFF_nn,
	ROFF_nop,
	ROFF_nr,
	ROFF_nrf,
	ROFF_nroff,
	ROFF_ns,
	ROFF_nx,
	ROFF_open,
	ROFF_opena,
	ROFF_os,
	ROFF_output,
	ROFF_padj,
	ROFF_papersize,
	ROFF_pc,
	ROFF_pev,
	ROFF_pi,
	ROFF_PI,
	ROFF_pl,
	ROFF_pm,
	ROFF_pn,
	ROFF_pnr,
	ROFF_ps,
	ROFF_psbb,
	ROFF_pshape,
	ROFF_pso,
	ROFF_ptr,
	ROFF_pvs,
	ROFF_rchar,
	ROFF_rd,
	ROFF_recursionlimit,
	ROFF_return,
	ROFF_rfschar,
	ROFF_rhang,
	ROFF_rm,
	ROFF_rn,
	ROFF_rnn,
	ROFF_rr,
	ROFF_rs,
	ROFF_rt,
	ROFF_schar,
	ROFF_sentchar,
	ROFF_shc,
	ROFF_shift,
	ROFF_sizes,
	ROFF_so,
	ROFF_spacewidth,
	ROFF_special,
	ROFF_spreadwarn,
	ROFF_ss,
	ROFF_sty,
	ROFF_substring,
	ROFF_sv,
	ROFF_sy,
	ROFF_T_,
	ROFF_tc,
	ROFF_TE,
	ROFF_TH,
	ROFF_tkf,
	ROFF_tl,
	ROFF_tm,
	ROFF_tm1,
	ROFF_tmc,
	ROFF_tr,
	ROFF_track,
	ROFF_transchar,
	ROFF_trf,
	ROFF_trimat,
	ROFF_trin,
	ROFF_trnt,
	ROFF_troff,
	ROFF_TS,
	ROFF_uf,
	ROFF_ul,
	ROFF_unformat,
	ROFF_unwatch,
	ROFF_unwatchn,
	ROFF_vpt,
	ROFF_vs,
	ROFF_warn,
	ROFF_warnscale,
	ROFF_watch,
	ROFF_watchlength,
	ROFF_watchn,
	ROFF_wh,
	ROFF_while,
	ROFF_write,
	ROFF_writec,
	ROFF_writem,
	ROFF_xflag,
	ROFF_cblock,
	ROFF_RENAMED,
	ROFF_USERDEF,
	TOKEN_NONE,
	MDOC_Dd,
	MDOC_Dt,
	MDOC_Os,
	MDOC_Sh,
	MDOC_Ss,
	MDOC_Pp,
	MDOC_D1,
	MDOC_Dl,
	MDOC_Bd,
	MDOC_Ed,
	MDOC_Bl,
	MDOC_El,
	MDOC_It,
	MDOC_Ad,
	MDOC_An,
	MDOC_Ap,
	MDOC_Ar,
	MDOC_Cd,
	MDOC_Cm,
	MDOC_Dv,
	MDOC_Er,
	MDOC_Ev,
	MDOC_Ex,
	MDOC_Fa,
	MDOC_Fd,
	MDOC_Fl,
	MDOC_Fn,
	MDOC_Ft,
	MDOC_Ic,
	MDOC_In,
	MDOC_Li,
	MDOC_Nd,
	MDOC_Nm,
	MDOC_Op,
	MDOC_Ot,
	MDOC_Pa,
	MDOC_Rv,
	MDOC_St,
	MDOC_Va,
	MDOC_Vt,
	MDOC_Xr,
	MDOC__A,
	MDOC__B,
	MDOC__D,
	MDOC__I,
	MDOC__J,
	MDOC__N,
	MDOC__O,
	MDOC__P,
	MDOC__R,
	MDOC__T,
	MDOC__V,
	MDOC_Ac,
	MDOC_Ao,
	MDOC_Aq,
	MDOC_At,
	MDOC_Bc,
	MDOC_Bf,
	MDOC_Bo,
	MDOC_Bq,
	MDOC_Bsx,
	MDOC_Bx,
	MDOC_Db,
	MDOC_Dc,
	MDOC_Do,
	MDOC_Dq,
	MDOC_Ec,
	MDOC_Ef,
	MDOC_Em,
	MDOC_Eo,
	MDOC_Fx,
	MDOC_Ms,
	MDOC_No,
	MDOC_Ns,
	MDOC_Nx,
	MDOC_Ox,
	MDOC_Pc,
	MDOC_Pf,
	MDOC_Po,
	MDOC_Pq,
	MDOC_Qc,
	MDOC_Ql,
	MDOC_Qo,
	MDOC_Qq,
	MDOC_Re,
	MDOC_Rs,
	MDOC_Sc,
	MDOC_So,
	MDOC_Sq,
	MDOC_Sm,
	MDOC_Sx,
	MDOC_Sy,
	MDOC_Tn,
	MDOC_Ux,
	MDOC_Xc,
	MDOC_Xo,
	MDOC_Fo,
	MDOC_Fc,
	MDOC_Oo,
	MDOC_Oc,
	MDOC_Bk,
	MDOC_Ek,
	MDOC_Bt,
	MDOC_Hf,
	MDOC_Fr,
	MDOC_Ud,
	MDOC_Lb,
	MDOC_Lp,
	MDOC_Lk,
	MDOC_Mt,
	MDOC_Brq,
	MDOC_Bro,
	MDOC_Brc,
	MDOC__C,
	MDOC_Es,
	MDOC_En,
	MDOC_Dx,
	MDOC__Q,
	MDOC__U,
	MDOC_Ta,
	MDOC_Tg,
	MDOC_MAX,
	MAN_TH,
	MAN_SH,
	MAN_SS,
	MAN_TP,
	MAN_TQ,
	MAN_LP,
	MAN_PP,
	MAN_P,
	MAN_IP,
	MAN_HP,
	MAN_SM,
	MAN_SB,
	MAN_BI,
	MAN_IB,
	MAN_BR,
	MAN_RB,
	MAN_R,
	MAN_B,
	MAN_I,
	MAN_IR,
	MAN_RI,
	MAN_RE,
	MAN_RS,
	MAN_DT,
	MAN_UC,
	MAN_PD,
	MAN_AT,
	MAN_in,
	MAN_SY,
	MAN_YS,
	MAN_OP,
	MAN_EX,
	MAN_EE,
	MAN_UR,
	MAN_UE,
	MAN_MT,
	MAN_ME,
	MAN_MAX
};

/*
 * 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. */
};

enum	mandoc_os {
	MANDOC_OS_OTHER = 0,
	MANDOC_OS_NETBSD,
	MANDOC_OS_OPENBSD
};

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 */
	struct tbl_span	 *span;    /* TBL */
	struct eqn_box	 *eqn;     /* EQN */
	int		  line;    /* Input file line number. */
	int		  pos;     /* Input file column number. */
	int		  flags;
#define	NODE_VALID	 (1 << 0)  /* Has been validated. */
#define	NODE_ENDED	 (1 << 1)  /* Gone past body end mark. */
#define	NODE_BROKEN	 (1 << 2)  /* Must validate parent when ending. */
#define	NODE_LINE	 (1 << 3)  /* First macro/text on line. */
#define	NODE_DELIMO	 (1 << 4)
#define	NODE_DELIMC	 (1 << 5)
#define	NODE_EOS	 (1 << 6)  /* At sentence boundary. */
#define	NODE_SYNPRETTY	 (1 << 7)  /* SYNOPSIS-style formatting. */
#define	NODE_NOFILL	 (1 << 8)  /* Fill mode switched off. */
#define	NODE_NOSRC	 (1 << 9)  /* Generated node, not in input file. */
#define	NODE_NOPRT	 (1 << 10) /* Shall not print anything. */
	int		  prev_font; /* Before entering this node. */
	int		  aux;     /* Decoded node data, type-dependent. */
	enum roff_tok	  tok;     /* Request or macro ID. */
	enum roff_type	  type;    /* AST node type. */
	enum roff_sec	  sec;     /* Current named section. */
	enum mdoc_endbody end;     /* BODY */
};

struct	roff_meta {
	struct roff_node *first;   /* The first node parsed. */
	char		 *msec;    /* Manual section, usually a digit. */
	char		 *vol;     /* Manual volume title. */
	char		 *os;      /* Operating system. */
	char		 *arch;    /* Machine architecture. */
	char		 *title;   /* Manual title, usually CAPS. */
	char		 *name;    /* Leading manual name. */
	char		 *date;    /* Normalized date. */
	char		 *sodest;  /* .so target file name or NULL. */
	int		  hasbody; /* Document is not empty. */
	int		  rcsids;  /* Bits indexed by enum mandoc_os. */
	enum mandoc_os	  os_e;    /* Operating system. */
	enum roff_macroset macroset; /* Kind of high-level macros used. */
};

extern	const char *const *roff_name;


int		 arch_valid(const char *, enum mandoc_os);
void		 deroff(char **, const struct roff_node *);