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version 1.1, 2009/01/16 14:04:26 version 1.38, 2010/05/25 21:38:05
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 .\"  .\"     $Id$
   .\"
   .\" Copyright (c) 2009-2010 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.
   .\"
 .Dd $Mdocdate$  .Dd $Mdocdate$
 .Dt mdoc 3  .Dt MDOC 3
 .Os  .Os
 .\"  
 .Sh NAME  .Sh NAME
 .Nm mdoc_alloc ,  .Nm mdoc_alloc ,
 .Nm mdoc_parseln ,  
 .Nm mdoc_endparse ,  .Nm mdoc_endparse ,
 .Nm mdoc_result ,  .Nm mdoc_free ,
 .Nm mdoc_free  .Nm mdoc_meta ,
 .Nd mdoc macro compiler  .Nm mdoc_node ,
 .\"  .Nm mdoc_parseln ,
   .Nm mdoc_reset
   .Nd mdoc macro compiler library
 .Sh SYNOPSIS  .Sh SYNOPSIS
   .In mandoc.h
 .In mdoc.h  .In mdoc.h
   .Vt extern const char * const * mdoc_macronames;
   .Vt extern const char * const * mdoc_argnames;
 .Ft "struct mdoc *"  .Ft "struct mdoc *"
 .Fn mdoc_alloc "void *data" "const struct mdoc_cb *cb"  .Fn mdoc_alloc "void *data" "int pflags" "mandocmsg msgs"
 .Ft void  
 .Fn mdoc_free "struct mdoc *"  
 .Ft int  .Ft int
 .Fn mdoc_parseln "struct mdoc *" "int" "char *buf"  .Fn mdoc_endparse "struct mdoc *mdoc"
   .Ft void
   .Fn mdoc_free "struct mdoc *mdoc"
   .Ft "const struct mdoc_meta *"
   .Fn mdoc_meta "const struct mdoc *mdoc"
 .Ft "const struct mdoc_node *"  .Ft "const struct mdoc_node *"
 .Fn mdoc_result "struct mdoc *"  .Fn mdoc_node "const struct mdoc *mdoc"
 .Ft int  .Ft int
 .Fn mdoc_endparse "struct mdoc *"  .Fn mdoc_parseln "struct mdoc *mdoc" "int line" "char *buf"
 .\"  .Ft int
   .Fn mdoc_reset "struct mdoc *mdoc"
 .Sh DESCRIPTION  .Sh DESCRIPTION
 The  The
 .Nm mdoc  .Nm mdoc
 library parses lines of mdoc-macro text into an abstract syntax tree.  library parses lines of
   .Xr mdoc 7
   input
   into an abstract syntax tree (AST).
   .Pp
 In general, applications initiate a parsing sequence with  In general, applications initiate a parsing sequence with
 .Fn mdoc_alloc ,  .Fn mdoc_alloc ,
 parse each line in a document with  parse each line in a document with
 .Fn mdoc_parseln ,  .Fn mdoc_parseln ,
 close the parsing session with  close the parsing session with
 .Fn mdoc_endparse ,  .Fn mdoc_endparse ,
 operate over the syntax tree returned by  operate over the syntax tree returned by
 .Fn mdoc_result ,  .Fn mdoc_node
   and
   .Fn mdoc_meta ,
 then free all allocated memory with  then free all allocated memory with
 .Fn mdoc_free .  .Fn mdoc_free .
   The
   .Fn mdoc_reset
   function may be used in order to reset the parser for another input
   sequence.
 See the  See the
 .Sx EXAMPLES  .Sx EXAMPLES
 section for a full example.  section for a simple example.
 .\" The following requests should be uncommented and used where appropriate.  .Pp
 .\" This next request is for sections 2, 3, and 9 function return values only.  This section further defines the
 .\" .Sh RETURN VALUES  .Sx Types ,
 .\" .Sh EXAMPLES  .Sx Functions
 .\" The next request is for sections 2, 3, and 9 error and signal handling only.  and
 .\" .Sh ERRORS  .Sx Variables
 .\" .Sh SEE ALSO  available to programmers.
 .\" .Xr foobar 1  Following that, the
 .\" .Sh STANDARDS  .Sx Abstract Syntax Tree
 .\" .Sh HISTORY  section documents the output tree.
 .\" .Sh AUTHORS  .Ss Types
 .\" .Sh CAVEATS  Both functions (see
 .\" .Sh BUGS  .Sx Functions )
   and variables (see
   .Sx Variables )
   may use the following types:
   .Bl -ohang
   .It Vt struct mdoc
   An opaque type defined in
   .Pa mdoc.c .
   Its values are only used privately within the library.
   .It Vt struct mdoc_node
   A parsed node.
   Defined in
   .Pa mdoc.h .
   See
   .Sx Abstract Syntax Tree
   for details.
   .It Vt mandocmsg
   A function callback type defined in
   .Pa mandoc.h .
   .El
   .Ss Functions
   Function descriptions follow:
   .Bl -ohang
   .It Fn mdoc_alloc
   Allocates a parsing structure.
   The
   .Fa data
   pointer is passed to callbacks in
   .Fa cb ,
   which are documented further in the header file.
   The
   .Fa pflags
   arguments are defined in
   .Pa mdoc.h .
   Returns NULL on failure.
   If non-NULL, the pointer must be freed with
   .Fn mdoc_free .
   .It Fn mdoc_reset
   Reset the parser for another parse routine.
   After its use,
   .Fn mdoc_parseln
   behaves as if invoked for the first time.
   If it returns 0, memory could not be allocated.
   .It Fn mdoc_free
   Free all resources of a parser.
   The pointer is no longer valid after invocation.
   .It Fn mdoc_parseln
   Parse a nil-terminated line of input.
   This line should not contain the trailing newline.
   Returns 0 on failure, 1 on success.
   The input buffer
   .Fa buf
   is modified by this function.
   .It Fn mdoc_endparse
   Signals that the parse is complete.
   Note that if
   .Fn mdoc_endparse
   is called subsequent to
   .Fn mdoc_node ,
   the resulting tree is incomplete.
   Returns 0 on failure, 1 on success.
   .It Fn mdoc_node
   Returns the first node of the parse.
   Note that if
   .Fn mdoc_parseln
   or
   .Fn mdoc_endparse
   return 0, the tree will be incomplete.
   .It Fn mdoc_meta
   Returns the document's parsed meta-data.
   If this information has not yet been supplied or
   .Fn mdoc_parseln
   or
   .Fn mdoc_endparse
   return 0, the data will be incomplete.
   .El
   .Ss Variables
   The following variables are also defined:
   .Bl -ohang
   .It Va mdoc_macronames
   An array of string-ified token names.
   .It Va mdoc_argnames
   An array of string-ified token argument names.
   .El
   .Ss Abstract Syntax Tree
   The
   .Nm
   functions produce an abstract syntax tree (AST) describing input in a
   regular form.
   It may be reviewed at any time with
   .Fn mdoc_nodes ;
   however, if called before
   .Fn mdoc_endparse ,
   or after
   .Fn mdoc_endparse
   or
   .Fn mdoc_parseln
   fail, it may be incomplete.
   .Pp
   This AST is governed by the ontological
   rules dictated in
   .Xr mdoc 7
   and derives its terminology accordingly.
   .Qq In-line
   elements described in
   .Xr mdoc 7
   are described simply as
   .Qq elements .
   .Pp
   The AST is composed of
   .Vt struct mdoc_node
   nodes with block, head, body, element, root and text types as declared
   by the
   .Va type
   field.
   Each node also provides its parse point (the
   .Va line ,
   .Va sec ,
   and
   .Va pos
   fields), its position in the tree (the
   .Va parent ,
   .Va child ,
   .Va next
   and
   .Va prev
   fields) and some type-specific data.
   .Pp
   The tree itself is arranged according to the following normal form,
   where capitalised non-terminals represent nodes.
   .Pp
   .Bl -tag -width "ELEMENTXX" -compact
   .It ROOT
   \(<- mnode+
   .It mnode
   \(<- BLOCK | ELEMENT | TEXT
   .It BLOCK
   \(<- (HEAD [TEXT])+ [BODY [TEXT]] [TAIL [TEXT]]
   .It BLOCK
   \(<- BODY [TEXT] [TAIL [TEXT]]
   .It ELEMENT
   \(<- TEXT*
   .It HEAD
   \(<- mnode+
   .It BODY
   \(<- mnode+
   .It TAIL
   \(<- mnode+
   .It TEXT
   \(<- [[:printable:],0x1e]*
   .El
   .Pp
   Of note are the TEXT nodes following the HEAD, BODY and TAIL nodes of
   the BLOCK production.
   These refer to punctuation marks.
   Furthermore, although a TEXT node will generally have a non-zero-length
   string, in the specific case of
   .Sq \&.Bd \-literal ,
   an empty line will produce a zero-length string.
   .Sh EXAMPLES
   The following example reads lines from stdin and parses them, operating
   on the finished parse tree with
   .Fn parsed .
   This example does not error-check nor free memory upon failure.
   .Bd -literal -offset indent
   struct mdoc *mdoc;
   const struct mdoc_node *node;
   char *buf;
   size_t len;
   int line;
   
   line = 1;
   mdoc = mdoc_alloc(NULL, 0, NULL);
   buf = NULL;
   alloc_len = 0;
   
   while ((len = getline(&buf, &alloc_len, stdin)) >= 0) {
       if (len && buflen[len - 1] = '\en')
           buf[len - 1] = '\e0';
       if ( ! mdoc_parseln(mdoc, line, buf))
           errx(1, "mdoc_parseln");
       line++;
   }
   
   if ( ! mdoc_endparse(mdoc))
       errx(1, "mdoc_endparse");
   if (NULL == (node = mdoc_node(mdoc)))
       errx(1, "mdoc_node");
   
   parsed(mdoc, node);
   mdoc_free(mdoc);
   .Ed
   .Pp
   Please see
   .Pa main.c
   in the source archive for a rigorous reference.
   .Sh SEE ALSO
   .Xr mandoc 1 ,
   .Xr mdoc 7
   .Sh AUTHORS
   The
   .Nm
   library was written by
   .An Kristaps Dzonsons Aq kristaps@bsd.lv .
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