-.\" $Id: mandoc.3,v 1.8 2011/05/17 12:22:15 kristaps Exp $
+.\" $Id: mandoc.3,v 1.17 2012/01/13 15:27:14 joerg Exp $
.\"
.\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
.\" Copyright (c) 2010 Ingo Schwarze <schwarze@openbsd.org>
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
-.Dd $Mdocdate: May 17 2011 $
+.Dd $Mdocdate: January 13 2012 $
.Dt MANDOC 3
.Os
.Sh NAME
.Nm mandoc ,
.Nm mandoc_escape ,
.Nm man_meta ,
+.Nm man_mparse ,
.Nm man_node ,
.Nm mchars_alloc ,
.Nm mchars_free ,
.Nm mchars_num2char ,
.Nm mchars_num2uc ,
-.Nm mchars_res2cp ,
-.Nm mchars_res2str ,
.Nm mchars_spec2cp ,
.Nm mchars_spec2str ,
.Nm mdoc_meta ,
.Nm mdoc_node ,
.Nm mparse_alloc ,
.Nm mparse_free ,
+.Nm mparse_getkeep ,
+.Nm mparse_keep ,
.Nm mparse_readfd ,
.Nm mparse_reset ,
.Nm mparse_result ,
.In mandoc.h
.Ft "enum mandoc_esc"
.Fo mandoc_escape
-.Fa "const char **in"
-.Fa "const char **seq"
-.Fa "int *len"
+.Fa "const char **end"
+.Fa "const char **start"
+.Fa "int *sz"
.Fc
.Ft "const struct man_meta *"
.Fo man_meta
.Fa "const struct man *man"
.Fc
+.Ft "const struct mparse *"
+.Fo man_mparse
+.Fa "const struct man *man"
+.Fc
.Ft "const struct man_node *"
.Fo man_node
.Fa "const struct man *man"
.Ft int
.Fn mchars_num2uc "const char *cp" "size_t sz"
.Ft "const char *"
-.Fo mchars_res2str
-.Fa "struct mchars *p"
-.Fa "const char *cp"
-.Fa "size_t sz"
-.Fa "size_t *rsz"
-.Fc
-.Ft int
-.Fo mchars_res2cp
-.Fa "struct mchars *p"
-.Fa "const char *cp"
-.Fa "size_t sz"
-.Ft "const char *"
-.Fc
-.Ft "const char *"
.Fo mchars_spec2str
-.Fa "struct mchars *p"
+.Fa "const struct mchars *p"
.Fa "const char *cp"
.Fa "size_t sz"
.Fa "size_t *rsz"
.Fc
.Ft int
.Fo mchars_spec2cp
-.Fa "struct mchars *p"
+.Fa "const struct mchars *p"
.Fa "const char *cp"
.Fa "size_t sz"
.Ft "const char *"
.Fo mparse_free
.Fa "struct mparse *parse"
.Fc
+.Ft void
+.Fo mparse_getkeep
+.Fa "const struct mparse *parse"
+.Fc
+.Ft void
+.Fo mparse_keep
+.Fa "struct mparse *parse"
+.Fc
.Ft "enum mandoclevel"
.Fo mparse_readfd
.Fa "struct mparse *parse"
.Pq see Fn mchars_alloc
and parsing escape sequences from strings
.Pq see Fn mandoc_escape .
-.Pp
-This library is
-.Ud
.Sh REFERENCE
This section documents the functions, types, and variables available
via
.Ss Types
.Bl -ohang
.It Vt "enum mandoc_esc"
+An escape sequence classification.
.It Vt "enum mandocerr"
+A fatal error, error, or warning message during parsing.
.It Vt "enum mandoclevel"
+A classification of an
+.Vt "enum mandoclevel"
+as regards system operation.
.It Vt "struct mchars"
An opaque pointer to an object allowing for translation between
character strings and glyphs.
See
.Fn mchars_alloc .
.It Vt "enum mparset"
+The type of parser when reading input.
+This should usually be
+.Dv MPARSE_AUTO
+for auto-detection.
.It Vt "struct mparse"
+An opaque pointer to a running parse sequence.
+Created with
+.Fn mparse_alloc
+and freed with
+.Fn mparse_free .
+This may be used across parsed input if
+.Fn mparse_reset
+is called between parses.
.It Vt "mandocmsg"
+A prototype for a function to handle fatal error, error, and warning
+messages emitted by the parser.
.El
.Ss Functions
.Bl -ohang
.It Fn mandoc_escape
Scan an escape sequence, i.e., a character string beginning with
.Sq \e .
-Pass a pointer to this string as
+Pass a pointer to the character after the
+.Sq \e
+as
.Va end ;
it will be set to the supremum of the parsed escape sequence unless
-returning ESCAPE_ERROR, in which case the string is bogus and should be
+returning
+.Dv ESCAPE_ERROR ,
+in which case the string is bogus and should be
thrown away.
-If not ESCAPE_ERROR or ESCAPE_IGNORE,
+If not
+.Dv ESCAPE_ERROR
+or
+.Dv ESCAPE_IGNORE ,
.Va start
is set to the first relevant character of the substring (font, glyph,
whatever) of length
.Va start
and
.Va sz
-may be NULL.
+may be
+.Dv NULL .
.It Fn man_meta
Obtain the meta-data of a successful parse.
This may only be used on a pointer returned by
.Fn mparse_result .
+.It Fn man_mparse
+Get the parser used for the current output.
.It Fn man_node
Obtain the root node of a successful parse.
This may only be used on a pointer returned by
Convert a hexadecimal character index (e.g., the \e[uNNNN] escape) into
a Unicode codepoint.
Returns \e0 (the nil character) if the input sequence is malformed.
-.It Fn mchars_res2cp
-Convert a predefined character into a valid Unicode codepoint.
-Returns \-1 on failure and 0 if no code-point exists (if this occurs,
-the caller should fall back to
-.Fn mchars_res2str ) .
-.It Fn mchars_res2str
-Convert a predefined character into an ASCII string.
-Returns NULL on failure.
.It Fn mchars_spec2cp
Convert a special character into a valid Unicode codepoint.
-Returns \-1 on failure and 0 if no code-point exists (if this occurs,
-the caller should fall back to
-.Fn mchars_spec2str ) .
+Returns \-1 on failure or a non-zero Unicode codepoint on success.
.It Fn mchars_spec2str
Convert a special character into an ASCII string.
-Returns NULL on failure.
+Returns
+.Dv NULL
+on failure.
.It Fn mdoc_meta
Obtain the meta-data of a successful parse.
This may only be used on a pointer returned by
.It Fn mparse_free
Free all memory allocated by
.Fn mparse_alloc .
+.It Fn mparse_getkeep
+Acquire the keep buffer.
+Must follow a call of
+.Fn mparse_keep .
+.It Fn mparse_keep
+Instruct the parser to retain a copy of its parsed input.
+This can be acquired with subsequent
+.Fn mparse_getkeep
+calls.
.It Fn mparse_readfd
Parse a file or file descriptor.
If
.Xr mdoc 7
and
.Xr man 7
-syntax trees.
+syntax trees and strings.
+.Ss Man and Mdoc Strings
+Strings may be extracted from mdoc and man meta-data, or from text
+nodes (MDOC_TEXT and MAN_TEXT, respectively).
+These strings have special non-printing formatting cues embedded in the
+text itself, as well as
+.Xr roff 7
+escapes preserved from input.
+Implementing systems will need to handle both situations to produce
+human-readable text.
+In general, strings may be assumed to consist of 7-bit ASCII characters.
+.Pp
+The following non-printing characters may be embedded in text strings:
+.Bl -tag -width Ds
+.It Dv ASCII_NBRSP
+A non-breaking space character.
+.It Dv ASCII_HYPH
+A soft hyphen.
+.El
+.Pp
+Escape characters are also passed verbatim into text strings.
+An escape character is a sequence of characters beginning with the
+backslash
+.Pq Sq \e .
+To construct human-readable text, these should be intercepted with
+.Fn mandoc_escape
+and converted with one of
+.Fn mchars_num2char ,
+.Fn mchars_spec2str ,
+and so on.
.Ss Man Abstract Syntax Tree
This AST is governed by the ontological rules dictated in
.Xr man 7
.It ELEMENT
\(<- ELEMENT | TEXT*
.It TEXT
-\(<- [[:alpha:]]*
+\(<- [[:ascii:]]*
.El
.Pp
The only elements capable of nesting other elements are those with
.It TAIL
\(<- mnode*
.It TEXT
-\(<- [[:printable:],0x1e]*
+\(<- [[:ascii:]]*
.El
.Pp
Of note are the TEXT nodes following the HEAD, BODY and TAIL nodes of
The
.Nm
library was written by
-.An Kristaps Dzonsons Aq kristaps@bsd.lv .
+.An Kristaps Dzonsons ,
+.Mt kristaps@bsd.lv .
git.ckatri.com / mandoc.git / blobdiff