version 1.1, 2009/01/16 14:04:26 |
version 1.34, 2009/09/16 09:41:24 |
|
|
.\" |
.\" $Id$ |
|
.\" |
|
.\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se> |
|
.\" |
|
.\" 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 |
.\" |
.\" SECTION |
.Sh NAME |
.Sh NAME |
.Nm mdoc_alloc , |
.Nm mdoc_alloc , |
.Nm mdoc_parseln , |
.Nm mdoc_parseln , |
.Nm mdoc_endparse , |
.Nm mdoc_endparse , |
.Nm mdoc_result , |
.Nm mdoc_node , |
.Nm mdoc_free |
.Nm mdoc_meta , |
.Nd mdoc macro compiler |
.Nm mdoc_free , |
.\" |
.Nm mdoc_reset |
|
.Nd mdoc macro compiler library |
|
.\" SECTION |
.Sh SYNOPSIS |
.Sh SYNOPSIS |
.In mdoc.h |
.Fd #include "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" "const struct mdoc_cb *cb" |
|
.Ft int |
|
.Fn mdoc_reset "struct mdoc *mdoc" |
.Ft void |
.Ft void |
.Fn mdoc_free "struct mdoc *" |
.Fn mdoc_free "struct mdoc *mdoc" |
.Ft int |
.Ft int |
.Fn mdoc_parseln "struct mdoc *" "int" "char *buf" |
.Fn mdoc_parseln "struct mdoc *mdoc" "int line" "char *buf" |
.Ft "const struct mdoc_node *" |
.Ft "const struct mdoc_node *" |
.Fn mdoc_result "struct mdoc *" |
.Fn mdoc_node "const struct mdoc *mdoc" |
|
.Ft "const struct mdoc_meta *" |
|
.Fn mdoc_meta "const struct mdoc *mdoc" |
.Ft int |
.Ft int |
.Fn mdoc_endparse "struct mdoc *" |
.Fn mdoc_endparse "struct mdoc *mdoc" |
.\" |
.\" SECTION |
.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 (and |
|
.Em only |
|
mdoc) into an abstract syntax tree (AST). |
|
.\" PARAGRAPH |
|
.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 . |
See the |
The |
|
.Fn mdoc_reset |
|
function may be used in order to reset the parser for another input |
|
sequence. See the |
.Sx EXAMPLES |
.Sx EXAMPLES |
section for a full example. |
section for a full example. |
.\" The following requests should be uncommented and used where appropriate. |
.\" PARAGRAPH |
.\" This next request is for sections 2, 3, and 9 function return values only. |
.Pp |
.\" .Sh RETURN VALUES |
This section further defines the |
.\" .Sh EXAMPLES |
.Sx Types , |
.\" The next request is for sections 2, 3, and 9 error and signal handling only. |
.Sx Functions |
.\" .Sh ERRORS |
and |
.\" .Sh SEE ALSO |
.Sx Variables |
.\" .Xr foobar 1 |
available to programmers. Following that, the |
.\" .Sh STANDARDS |
.Sx Abstract Syntax Tree |
.\" .Sh HISTORY |
section documents the output tree. |
.\" .Sh AUTHORS |
.\" SUBSECTION |
.\" .Sh CAVEATS |
.Ss Types |
.\" .Sh BUGS |
Both functions (see |
|
.Sx Functions ) |
|
and variables (see |
|
.Sx Variables ) |
|
may use the following types: |
|
.Bl -ohang -offset "XXXX" |
|
.\" LIST-ITEM |
|
.It Vt struct mdoc |
|
An opaque type defined in |
|
.Pa mdoc.c . |
|
Its values are only used privately within the library. |
|
.\" LIST-ITEM |
|
.It Vt struct mdoc_cb |
|
A set of message callbacks defined in |
|
.Pa mdoc.h . |
|
.\" LIST-ITEM |
|
.It Vt struct mdoc_node |
|
A parsed node. Defined in |
|
.Pa mdoc.h . |
|
See |
|
.Sx Abstract Syntax Tree |
|
for details. |
|
.El |
|
.\" SUBSECTION |
|
.Ss Functions |
|
Function descriptions follow: |
|
.Bl -ohang -offset "XXXX" |
|
.\" LIST-ITEM |
|
.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 . |
|
.\" LIST-ITEM |
|
.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. |
|
.\" LIST-ITEM |
|
.It Fn mdoc_free |
|
Free all resources of a parser. The pointer is no longer valid after |
|
invocation. |
|
.\" LIST-ITEM |
|
.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. |
|
.\" LIST-ITEM |
|
.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. |
|
.\" LIST-ITEM |
|
.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 |
|
.\" SUBSECTION |
|
.Ss Variables |
|
The following variables are also defined: |
|
.Bl -ohang -offset "XXXX" |
|
.\" LIST-ITEM |
|
.It Va mdoc_macronames |
|
An array of string-ified token names. |
|
.\" LIST-ITEM |
|
.It Va mdoc_argnames |
|
An array of string-ified token argument names. |
|
.El |
|
.\" SUBSECTION |
|
.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. |
|
.\" PARAGRAPH |
|
.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 . |
|
.\" PARAGRAPH |
|
.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. |
|
.\" PARAGRAPH |
|
.Pp |
|
The tree itself is arranged according to the following normal form, |
|
where capitalised non-terminals represent nodes. |
|
.Pp |
|
.Bl -tag -width "ELEMENTXX" -compact -offset "XXXX" |
|
.\" LIST-ITEM |
|
.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 |
|
\(<- [[:alpha:]]* |
|
.El |
|
.\" PARAGRAPH |
|
.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. |
|
.\" SECTION |
|
.Sh EXAMPLES |
|
The following example reads lines from stdin and parses them, operating |
|
on the finished parse tree with |
|
.Fn parsed . |
|
Note that, if the last line of the file isn't newline-terminated, this |
|
will truncate the file's last character (see |
|
.Xr fgetln 3 ) . |
|
Further, this example does not error-check nor free memory upon failure. |
|
.Bd -literal -offset "XXXX" |
|
struct mdoc *mdoc; |
|
const struct mdoc_node *node; |
|
char *buf; |
|
size_t len; |
|
int line; |
|
|
|
line = 1; |
|
mdoc = mdoc_alloc(NULL, 0, NULL); |
|
|
|
while ((buf = fgetln(fp, &len))) { |
|
buf[len - 1] = '\\0'; |
|
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 |
|
.\" SECTION |
|
.Sh SEE ALSO |
|
.Xr mandoc 1 , |
|
.Xr mdoc 7 |
|
.\" SECTION |
|
.Sh AUTHORS |
|
The |
|
.Nm |
|
utility was written by |
|
.An Kristaps Dzonsons Aq kristaps@kth.se . |
|
.\" SECTION |
|
.Sh CAVEATS |
|
.Bl -dash -compact |
|
.\" LIST-ITEM |
|
.It |
|
The |
|
.Sq \&.Xc |
|
and |
|
.Sq \&.Xo |
|
macros aren't handled when used to span lines for the |
|
.Sq \&.It |
|
macro. |
|
.\" LIST-ITEM |
|
.It |
|
The |
|
.Sq \&.Bsx |
|
macro family doesn't yet understand version arguments. |
|
.\" LIST-ITEM |
|
.It |
|
If not given a value, the \-offset argument to |
|
.Sq \&.Bd |
|
and |
|
.Sq \&.Bl |
|
should be the width of |
|
.Qq <string> ; |
|
instead, a value of |
|
.Li 10n |
|
is provided. |
|
.\" LIST-ITEM |
|
.It |
|
Columns widths in |
|
.Sq \&.Bl \-column |
|
should default to width |
|
.Qq <stringx> |
|
if not included. |
|
.El |