Handle nested, recursive mathematical subexpressions. This is

[mandoc.git] / mdoc.3

diff --git a/mdoc.3 b/mdoc.3
index f65b4c39e35fc17e6b56c60cea8fcceca60bed31..3620b15552a9720da17e5379083029a5af928ecb 100644 (file)
--- a/mdoc.3
+++ b/mdoc.3
@@ -1,6 +1,7 @@
-.\"    $Id: mdoc.3,v 1.45 2010/06/29 19:20:38 schwarze Exp $
+.\"    $Id: mdoc.3,v 1.49 2010/08/20 01:02:07 schwarze Exp $

 .\"
 .\"

-.\" Copyright (c) 2009-2010 Kristaps Dzonsons <kristaps@bsd.lv>
+.\" Copyright (c) 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
+.\" Copyright (c) 2010 Ingo Schwarze <schwarze@openbsd.org>

 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above


@@ -14,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"

-.Dd $Mdocdate: June 29 2010 $
+.Dd $Mdocdate: August 20 2010 $

 .Dt MDOC 3
 .Os
 .Sh NAME
 .Dt MDOC 3
 .Os
 .Sh NAME


@@ -29,7 +30,6 @@
 .Nd mdoc macro compiler library
 .Sh SYNOPSIS
 .In mandoc.h
 .Nd mdoc macro compiler library
 .Sh SYNOPSIS
 .In mandoc.h

-.In regs.h

 .In mdoc.h
 .Vt extern const char * const * mdoc_macronames;
 .Vt extern const char * const * mdoc_argnames;
 .In mdoc.h
 .Vt extern const char * const * mdoc_macronames;
 .Vt extern const char * const * mdoc_argnames;


@@ -37,7 +37,6 @@
 .Fo mdoc_alloc
 .Fa "struct regset *regs"
 .Fa "void *data"
 .Fo mdoc_alloc
 .Fa "struct regset *regs"
 .Fa "void *data"

-.Fa "int pflags"

 .Fa "mandocmsg msgs"
 .Fc
 .Ft int
 .Fa "mandocmsg msgs"
 .Fc
 .Ft int


@@ -124,10 +123,6 @@ The
 .Fa data
 pointer is passed to
 .Fa msgs .
 .Fa data
 pointer is passed to
 .Fa msgs .

-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 .
 Returns NULL on failure.
 If non-NULL, the pointer must be freed with
 .Fn mdoc_free .


@@ -257,10 +252,10 @@ an empty line will produce a zero-length string.
 Multiple body parts are only found in invocations of
 .Sq \&Bl \-column ,
 where a new body introduces a new phrase.
 Multiple body parts are only found in invocations of
 .Sq \&Bl \-column ,
 where a new body introduces a new phrase.

-.Ss Badly nested blocks
-A special kind of node is available to end the formatting
-associated with a given block before the physical end of that block.
-Such an ENDBODY node has a non-null
+.Ss Badly-nested Blocks
+The ENDBODY node is available to end the formatting associated
+with a given block before the physical end of that block.
+It has a non-null

 .Va end
 field, is of the BODY
 .Va type ,
 .Va end
 field, is of the BODY
 .Va type ,


@@ -297,25 +292,32 @@ BLOCK Ao
 TEXT end
 .Ed
 .Pp
 TEXT end
 .Ed
 .Pp

-Here, the formatting of the Ao block extends from TEXT ao to TEXT ac,
-while the formatting of the Bo block extends from TEXT bo to TEXT bc,
-rendering like this in
+Here, the formatting of the
+.Sq \&Ao
+block extends from TEXT ao to TEXT ac,
+while the formatting of the
+.Sq \&Bo
+block extends from TEXT bo to TEXT bc.
+It renders as follows in

 .Fl T Ns Cm ascii
 mode:
 .Fl T Ns Cm ascii
 mode:

+.Pp

 .Dl <ao [bo ac> bc] end
 .Dl <ao [bo ac> bc] end

-Support for badly nested blocks is only provided for backward
+.Pp
+Support for badly-nested blocks is only provided for backward

 compatibility with some older
 .Xr mdoc 7
 implementations.
 compatibility with some older
 .Xr mdoc 7
 implementations.

-Using them in new code is stronly discouraged:
-Some frontends, in particular
-.Fl T Ns Cm html ,
-are unable to render them in any meaningful way,
-many other
-.Xr mdoc 7
-implementations do not support them, and even for those that do,
-the behaviour is not well-defined, in particular when using multiple
-levels of badly nested blocks.
+Using badly-nested blocks is
+.Em strongly discouraged :
+the
+.Fl T Ns Cm html
+and
+.Fl T Ns Cm xhtml
+front-ends are unable to render them in any meaningful way.
+Furthermore, behaviour when encountering badly-nested blocks is not
+consistent across troff implementations, especially when using  multiple
+levels of badly-nested blocks.

 .Sh EXAMPLES
 The following example reads lines from stdin and parses them, operating
 on the finished parse tree with
 .Sh EXAMPLES
 The following example reads lines from stdin and parses them, operating
 on the finished parse tree with


@@ -331,7 +333,7 @@ int line;
 
 bzero(&regs, sizeof(struct regset));
 line = 1;
 
 bzero(&regs, sizeof(struct regset));
 line = 1;

-mdoc = mdoc_alloc(&regs, NULL, 0, NULL);
+mdoc = mdoc_alloc(&regs, NULL, NULL);

 buf = NULL;
 alloc_len = 0;
 
 buf = NULL;
 alloc_len = 0;