version 1.16, 2009/03/12 23:05:21 |
version 1.17, 2009/03/14 05:21:58 |
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.Sh DESCRIPTION |
.Sh DESCRIPTION |
The |
The |
.Nm mdoc |
.Nm mdoc |
library parses lines of mdoc input into an abstract syntax tree. |
library parses lines of |
.Dq mdoc , |
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which is used to format BSD manual pages, is a macro package of the |
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.Dq roff |
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language. The |
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.Nm |
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library implements only those macros documented in the |
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.Xr mdoc 7 |
.Xr mdoc 7 |
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input (and |
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.Em only |
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mdoc) into an abstract syntax tree that generalises the semantic |
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annotation of its input. Common front-ends for |
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.Nm |
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are |
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.Xr mdocterm 1 , |
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.Xr mdoclint 1 |
and |
and |
.Xr mdoc.samples 7 |
.Xr mdoctree 1 . |
manuals. Documents with |
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.Xr refer 1 , |
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.Xr eqn 1 |
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and other pre-processor sections aren't accomodated. |
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.\" PARAGRAPH |
.\" PARAGRAPH |
.Pp |
.Pp |
.Nm |
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is |
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.Ud |
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.\" PARAGRAPH |
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.Pp |
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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 |
Line 92 This section further defines the |
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Line 85 This section further defines the |
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.Sx Functions |
.Sx Functions |
and |
and |
.Sx Variables |
.Sx Variables |
available to programmers. Following that, |
available to programmers. Following that, the |
.Sx Character Encoding |
.Sx Abstract Syntax Tree |
describes input format. Lastly, |
section documents the output tree. |
.Sx Abstract Syntax Tree , |
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documents the output tree. |
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.\" SUBSECTION |
.\" SUBSECTION |
.Ss Types |
.Ss Types |
Both functions (see |
Both functions (see |
Line 179 An array of string-ified token names. |
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Line 170 An array of string-ified token names. |
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An array of string-ified token argument names. |
An array of string-ified token argument names. |
.El |
.El |
.\" SUBSECTION |
.\" SUBSECTION |
.Ss Character Encoding |
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The |
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.Xr mdoc 3 |
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library accepts only printable ASCII characters as defined by |
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.Xr isprint 3 . |
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Non-ASCII character sequences are delimited in various ways. All are |
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preceeded by an escape character |
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.Sq \\ |
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and followed by either an open-parenthesis |
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.Sq \&( |
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for two-character sequences; an open-bracket |
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.Sq \&[ |
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for n-character sequences (terminated at a close-bracket |
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.Sq \&] ) ; |
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an asterisk and open-parenthesis |
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.Sq \&*( |
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for two-character sequences; |
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an asterisk and non-open-parenthesis |
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.Sq \&* |
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for single-character sequences; or one of a small set of standalone |
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single characters for other escapes. |
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.\" PARAGRAPH |
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.Pp |
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Examples: |
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.Pp |
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.Bl -tag -width "XXXXXXXX" -offset "XXXX" -compact |
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.\" LIST-ITEM |
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.It \\*(<= |
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prints |
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.Dq \*(<= |
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.Pq greater-equal |
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.\" LIST-ITEM |
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.It \\(<- |
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prints |
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.Dq \(<- |
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.Pq left-arrow |
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.\" LIST-ITEM |
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.It \\[<-] |
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also prints |
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.Dq \(<- |
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.Pq left-arrow |
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.\" LIST-ITEM |
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.It \\*(Ba |
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prints |
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.Dq \*(Ba |
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.Pq bar |
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.\" LIST-ITEM |
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.It \\*q |
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prints |
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.Dq \*q |
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.Pq double-quote |
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.El |
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.\" PARAGRAPH |
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.Pp |
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All escaped sequences are syntax-checked, but it's up to the front-end |
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system to correctly render them to the output device. |
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.\" SUBSECTION |
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.Ss Abstract Syntax Tree |
.Ss Abstract Syntax Tree |
The |
The |
.Nm |
.Nm |
functions produce an abstract syntax tree (AST) describing the input |
functions produce an abstract syntax tree (AST) describing input in a |
lines in a regular form. It may be reviewed at any time with |
regular form. It may be reviewed at any time with |
.Fn mdoc_nodes ; |
.Fn mdoc_nodes ; |
however, if called before |
however, if called before |
.Fn mdoc_endparse , |
.Fn mdoc_endparse , |
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.Fn mdoc_endparse |
.Fn mdoc_endparse |
or |
or |
.Fn mdoc_parseln |
.Fn mdoc_parseln |
fail, it may be incomplete. |
fail, it may be incomplete. This AST is governed by the ontological |
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rules dictated in |
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.Xr mdoc 7 |
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and derives its terminology accordingly. |
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.Qq In-line |
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elements described in |
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.Xr mdoc 7 |
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are described simply as |
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.Qq elements . |
.\" PARAGRAPH |
.\" PARAGRAPH |
.Pp |
.Pp |
The AST is composed of |
The AST is composed of |
Line 304 although a TEXT node will generally have a non-zero-le |
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Line 246 although a TEXT node will generally have a non-zero-le |
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the specific case of |
the specific case of |
.Sq \&.Bd \-literal , |
.Sq \&.Bd \-literal , |
an empty line will produce a zero-length string. |
an empty line will produce a zero-length string. |
.\" PARAGRAPH |
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.Pp |
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The rule-of-thumb for mapping node types to macros follows. In-line |
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elements, such as |
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.Sq \&.Em foo , |
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are classified as ELEMENT nodes, which can only contain text. |
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Multi-line elements, such as |
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.Sq \&.Sh , |
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are BLOCK elements, where the HEAD constitutes line contents and the |
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BODY constitutes subsequent lines. In-line elements with matching |
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pairs, such as |
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.Sq \&.So |
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and |
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.Sq \&.Sc , |
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are BLOCK elements with no HEAD tag. The only exception to this is |
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.Sq \&.Eo |
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and |
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.Sq \&.Ec , |
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which has a HEAD and TAIL node corresponding to the enclosure string. |
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TEXT nodes, obviously, constitute text, and the ROOT node is the |
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document's root. |
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.\" SECTION |
.\" SECTION |
.Sh EXAMPLES |
.Sh EXAMPLES |
The following example reads lines from stdin and parses them, operating |
The following example reads lines from stdin and parses them, operating |
Line 360 parsed(mdoc, node); |
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Line 281 parsed(mdoc, node); |
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mdoc_free(mdoc); |
mdoc_free(mdoc); |
.Ed |
.Ed |
.\" SECTION |
.\" SECTION |
.Sh COMPATIBILITY |
.Sh SEE ALSO |
In general, only those macros specified by |
.Xr mdocterm 1 , |
.Xr mdoc.samples 7 |
.Xr mdoclint 1 , |
and |
.Xr mdoctree 1 , |
.Xr mdoc 7 |
.Xr mdoc 7 |
for |
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.Ox |
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and |
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.Nx |
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are supported; support for other |
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.Bx |
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systems is in progress. |
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.Bl -bullet |
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.\" LIST-ITEM |
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.It |
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.Sq \&Cd |
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isn't labelled as callable but is. |
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.\" LIST-ITEM |
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.It |
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NetBSD |
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.Sq \&It \-nested |
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is assumed for all lists: any list may be nested and |
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.Sq \-enum |
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lists will restart the sequence only for the sub-list. |
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.\" LIST-ITEM |
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.It |
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Newer NetBSD-style |
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.Sq \&It \-column |
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syntax, where column widths may be preceeded by other arguments (instead |
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of proceeded), is not supported. |
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.\" LIST-ITEM |
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.It |
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The |
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.Sq \&At |
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macro only accepts a single parameter. |
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.\" LIST-ITEM |
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.It |
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Some manuals use |
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.Sq \&Li |
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incorrectly by following it with a delimeter (see |
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.Xr mdoc.samples 7 ) |
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and expecting the delimiter to render. This is not supported. |
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.\" LIST-ITEM |
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.It |
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The system-name macros ( |
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.Ns Sq \&At , |
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.Sq \&Bsx , |
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.Sq \&Bx , |
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.Sq \&Fx , |
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.Sq \&Nx , |
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.Sq \&Ox , |
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and |
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.Sq \&Ux ) |
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are callable. |
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.El |
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.\" SECTION |
.\" SECTION |
.Sh SEE ALSO |
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.Xr mdoc 7 , |
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.Xr mdoc.samples 7 , |
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.Xr groff 1 , |
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.Xr mdocml 1 |
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.\" SECTION |
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.Sh AUTHORS |
.Sh AUTHORS |
The |
The |
.Nm |
.Nm |
Line 429 utility was written by |
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Line 294 utility was written by |
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.An Kristaps Dzonsons Aq kristaps@kth.se . |
.An Kristaps Dzonsons Aq kristaps@kth.se . |
.\" SECTION |
.\" SECTION |
.Sh CAVEATS |
.Sh CAVEATS |
.Bl -bullet |
.Bl -dash -compact |
.\" LIST-ITEM |
.\" LIST-ITEM |
.It |
.It |
The |
The |
|
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.Sq \&Xo |
.Sq \&Xo |
macros aren't handled when used to span lines for the |
macros aren't handled when used to span lines for the |
.Sq \&It |
.Sq \&It |
macro. Such usage is specifically discouraged in |
macro. |
.Xr mdoc.samples 7 . |
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.\" LIST-ITEM |
.\" LIST-ITEM |
.It |
.It |
The |
The |
.Sq \&Bsx |
.Sq \&Bsx |
macro doesn't understand yet the arguments as dictated for |
macro doesn't yet understand version arguments. |
.Nx . |
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.El |
.El |