-.\" $Id: mandoc.3,v 1.6 2011/05/01 10:40:52 kristaps Exp $
+.\" $Id: mandoc.3,v 1.12 2011/07/11 08:43:27 kristaps 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 1 2011 $
+.Dd $Mdocdate: July 11 2011 $
.Dt MANDOC 3
.Os
.Sh NAME
.Nm mchars_alloc ,
.Nm mchars_free ,
.Nm mchars_num2char ,
-.Nm mchars_res2cp ,
-.Nm mchars_res2str ,
+.Nm mchars_num2uc ,
.Nm mchars_spec2cp ,
.Nm mchars_spec2str ,
.Nm mdoc_meta ,
.Nm mparse_strerror ,
.Nm mparse_strlevel
.Nd mandoc macro compiler library
+.Sh LIBRARY
+.Lb mandoc
.Sh SYNOPSIS
.In man.h
.In mdoc.h
.Fn mchars_free "struct mchars *p"
.Ft char
.Fn mchars_num2char "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
+.Fn mchars_num2uc "const char *cp" "size_t sz"
.Ft "const char *"
.Fo mchars_spec2str
.Fa "struct mchars *p"
.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
Pass a pointer to this string 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
Free an object created with
.Fn mchars_alloc .
.It Fn mchars_num2char
-Convert a character index as found in \eN\(aq\(aq into a printable
-character.
+Convert a character index (e.g., the \eN\(aq\(aq escape) into a
+printable ASCII character.
+Returns \e0 (the nil character) if the input sequence is malformed.
+.It Fn mchars_num2uc
+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
.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
git.ckatri.com / mandoc.git / blobdiff