.Dd December 1, 2014
.Dt MANDOC_HEADERS 3
.Os
.Sh NAME
.Nm mandoc_headers
.Nd ordering of mandoc include files
.Sh DESCRIPTION
To support a cleaner coding style, the mandoc header files do not
contain any include directives and do not guard against multiple
inclusion.
The application developer has to make sure that the headers are
included in a proper order, and that no header is included more
than once.
.Pp
The headers and functions form three major groups:
.Sx Parser interface ,
.Sx Parser internals ,
and
.Sx Formatter interface .
.Pp
Various rules are given below prohibiting the inclusion of certain
combinations of headers into the same file.
The intention is to keep the following functional components
separate from each other:
.Pp
.Bl -dash -offset indent -compact
.It
.Xr mdoc 7
parser
.It
.Xr man 7
parser
.It
.Xr roff 7
parser
.It
.Xr tbl 7
parser
.It
.Xr eqn 7
parser
.It
terminal formatters
.It
HTML formatters
.It
search tools
.El
.Pp
Note that mere usage of an opaque struct type does
.Em not
require inclusion of the header where that type is defined.
.Ss Parser interface
Each of the following headers can be included without including
any other mandoc header.
These headers should be included before any other mandoc headers.
Afterwards, any other mandoc headers can be included as needed.
.Bl -tag -width Ds
.It Qq Pa mandoc_aux.h
Requires
.In sys/types.h
for
.Vt size_t .
Provides the utility functions documented in
.Xr mandoc_malloc 3 .
.It Qq Pa mandoc.h
Requires
.In sys/types.h
for
.Vt size_t .
.Pp
Provides
.Vt enum mandoc_esc ,
.Vt enum mandocerr ,
.Vt enum mandoclevel ,
.Vt enum tbl_cellt ,
.Vt enum tbl_datt ,
.Vt enum tbl_spant ,
.Vt enum eqn_boxt ,
.Vt enum eqn_fontt ,
.Vt enum eqn_pilet ,
.Vt enum eqn_post ,
.Vt struct tbl_opts ,
.Vt struct tbl_head ,
.Vt struct tbl_cell ,
.Vt struct tbl_row ,
.Vt struct tbl_dat ,
.Vt struct tbl_span ,
.Vt struct eqn_box ,
.Vt struct eqn ,
the function prototype typedef
.Fn mandocmsg ,
the function
.Xr mandoc_escape 3 ,
the functions described in
.Xr mchars_alloc 3 ,
and the functions
.Fn mparse_*
described in
.Xr mandoc 3 .
.Pp
Uses the opaque types
.Vt struct mparse
from
.Pa read.c
and
.Vt struct mchars
from
.Pa chars.c
for function prototypes.
Uses the types
.Vt struct mdoc
from
.Pa libmdoc.h
and
.Vt struct man
from
.Pa libman.h
as opaque types for function prototypes.
.It Qq Pa mdoc.h
Requires
.In sys/types.h
for
.Vt size_t .
.Pp
Provides
.Vt enum mdoct ,
.Vt enum mdocargt ,
.Vt enum mdoc_type ,
.Vt enum mdoc_sec ,
.Vt enum mdoc_endbody ,
.Vt enum mdoc_disp ,
.Vt enum mdoc_list ,
.Vt enum mdoc_auth ,
.Vt enum mdoc_font ,
.Vt struct mdoc_meta ,
.Vt struct mdoc_argv ,
.Vt struct mdoc_arg ,
.Vt struct mdoc_bd ,
.Vt struct mdoc_bl ,
.Vt struct mdoc_an ,
.Vt struct mdoc_bf ,
.Vt struct mdoc_rs ,
.Vt struct mdoc_node ,
and the functions
.Fn mdoc_*
described in
.Xr mandoc 3 .
.Pp
Uses the type
.Vt struct mdoc
from
.Pa libmdoc.h
as an opaque type for function prototypes.
Uses pointers to the types
.Vt struct tbl_span
and
.Vt struct eqn
as opaque struct members.
.Pp
When this header is included, the same file should not include
.Pa libman.h
or
.Pa libroff.h .
.It Qq Pa man.h
Provides
.Vt enum mant ,
.Vt enum man_type ,
.Vt struct man_meta ,
.Vt struct man_node ,
and the functions
.Fn man_*
described in
.Xr mandoc 3 .
.Pp
Uses the opaque type
.Vt struct mparse
from
.Pa read.c
for function prototypes.
Uses the type
.Vt struct man
from
.Pa libman.h
as an opaque type for function prototypes.
Uses pointers to the types
.Vt struct tbl_span
and
.Vt struct eqn
as opaque struct members.
.Pp
When this header is included, the same file should not include
.Pa libmdoc.h
or
.Pa libroff.h .
.El
.Ss Parser internals
The following headers require inclusion of a parser interface header
before they can be included.  All parser interface headers should
precede all parser internal headers.  When any parser internal headers
are included, the same file should not include any formatter headers.
.Bl -tag -width Ds
.It Qq Pa libmandoc.h
Requires
.In sys/types.h
for
.Vt size_t
and
.Qq Pa mandoc.h
for
.Vt enum mandocerr .
.Pp
Provides
.Vt enum rofferr ,
.Vt struct buf ,
utility functions needed by multiple parsers,
and the top-level functions to call the parsers.
.Pp
Uses the opaque types
.Vt struct mparse
from
.Pa read.c
and
.Vt struct roff
from
.Pa roff.c
for function prototypes.
Uses the types
.Vt struct tbl_span
and
.Vt struct eqn
from
.Pa mandoc.h ,
.Vt struct mdoc
from
.Pa libmdoc.h ,
and
.Vt struct man
from
.Pa libman.h
as opaque types for function prototypes.
.It Qq Pa libmdoc.h
Requires
.Qq Pa mdoc.h
for
.Vt enum mdoct ,
.Vt enum mdoc_* ,
and
.Vt struct mdoc_* .
.Pp
Provides
.Vt enum mdoc_next ,
.Vt enum margserr ,
.Vt enum mdelim ,
.Vt struct mdoc ,
.Vt struct mdoc_macro ,
and many functions internal to the
.Xr mdoc 7
parser.
.Pp
Uses the opaque types
.Vt struct mparse
from
.Pa read.c
and
.Vt struct roff
from
.Pa roff.c .
.Pp
When this header is included, the same file should not include
.Pa man.h ,
.Pa libman.h ,
or
.Pa libroff.h .
.It Qq Pa libman.h
Requires
.Qq Pa man.h
for
.Vt enum mant
and
.Vt struct man_node.
.Pp
Provides
.Vt enum man_next ,
.Vt struct man ,
.Vt struct man_macro ,
and many functions internal to the
.Xr man 7
parser.
.Pp
Uses the opaque types
.Vt struct mparse
from
.Pa read.c
and
.Vt struct roff
from
.Pa roff.c .
.Pp
When this header is included, the same file should not include
.Pa mdoc.h ,
.Pa libmdoc.h ,
or
.Pa libroff.h .
.It Qq Pa libroff.h
Requires
.In sys/types.h
for
.Vt size_t ,
.Qq Pa mandoc.h
for
.Vt struct tbl_*
and
.Vt struct eqn ,
and
.Qq Pa libmandoc.h
for
.Vt enum rofferr .
.Pp
Provides
.Vt enum tbl_part ,
.Vt struct tbl_node ,
.Vt struct eqn_def ,
.Vt struct eqn_node ,
and many functions internal to the
.Xr tbl 7
and
.Xr eqn 7
parsers.
.Pp
Uses the opaque type
.Vt struct mparse
from
.Pa read.c .
.Pp
When this header is included, the same file should not include
.Pa man.h ,
.Pa mdoc.h ,
.Pa libman.h ,
or
.Pa libmdoc.h .
.El
.Ss Formatter interface
These headers should be included after any parser interface headers.
No parser internal headers should be included by the same file.
.Bl -tag -width Ds
.It Qq Pa out.h
Requires
.In sys/types.h
for
.Vt size_t .
.Pp
Provides
.Vt enum roffscale ,
.Vt struct roffcol ,
.Vt struct roffsu ,
.Vt struct rofftbl ,
.Fn a2roffsu ,
and
.Fn tblcalc .
.Pp
Uses
.Vt struct tbl_span
from
.Pa mandoc.h
as an opaque type for function prototypes.
.Pp
When this header is included, the same file should not include
.Pa manpath.h
or
.Pa mansearch.h .
.It Qq Pa term.h
Requires
.In sys/types.h
for
.Vt size_t
and
.Qq Pa out.h
for
.Vt struct roffsu
and
.Vt struct rofftbl .
.Pp
Provides
.Vt enum termenc ,
.Vt enum termfont ,
.Vt enum termtype ,
.Vt struct termp_tbl ,
.Vt struct termp ,
and many terminal formatting functions.
.Pp
Uses the opaque types
.Vt struct mchars
from
.Pa chars.c
and
.Vt struct termp_ps
from
.Pa term_ps.c .
Uses
.Vt struct tbl_span
and
.Vt struct eqn
from
.Pa mandoc.h
as opaque types for function prototypes.
.Pp
When this header is included, the same file should not include
.Pa html.h ,
.Pa manpath.h
or
.Pa mansearch.h .
.It Qq Pa html.h
Requires
.In sys/types.h
for
.Vt size_t ,
.In stdio.h
for
.Dv BUFSIZ ,
and
.Qq Pa out.h
for
.Vt struct roffsu
and
.Vt struct rofftbl .
.Pp
Provides
.Vt enum htmltag ,
.Vt enum htmlattr ,
.Vt enum htmlfont ,
.Vt struct tag ,
.Vt struct tagq ,
.Vt struct htmlpair ,
.Vt struct html ,
and many HTML formatting functions.
.Pp
Uses the opaque type
.Vt struct mchars
from
.Pa chars.c .
.Pp
When this header is included, the same file should not include
.Pa term.h ,
.Pa manpath.h
or
.Pa mansearch.h .
.It Qq Pa main.h
Provides the top level steering functions for all formatters.
.Pp
Uses the opaque type
.Vt struct mchars
from
.Pa chars.c .
Uses the types
.Vt struct mdoc
from
.Pa libmdoc.h
and
.Vt struct man
from
.Pa libman.h
as opaque types for function prototypes.
.It Qq Pa manpath.h
Requires
.In sys/types.h
for
.Vt size_t .
.Pp
Provides
.Vt struct manpaths
and the functions
.Fn manpath_manconf ,
.Fn manpath_parse ,
and
.Fn manpath_free .
.Pp
When this header is included, the same file should not include
.Pa out.h ,
.Pa term.h ,
or
.Pa html.h .
.It Qq Pa mansearch.h
Requires
.In sys/types.h
for
.Vt size_t
and
.In stdint.h
for
.Vt uint64_t .
.Pp
Provides
.Vt enum argmode ,
.Vt struct manpage ,
.Vt struct mansearch ,
and the functions
.Fn mansearch_setup ,
.Fn mansearch ,
and
.Fn mansearch_free .
.Pp
Uses
.Vt struct manpaths
from
.Pa manpath.h
as an opaque type for function prototypes.
.Pp
When this header is included, the same file should not include
.Pa out.h ,
.Pa term.h ,
or
.Pa html.h .
.El