On Fri, Jul 12, 2013 at 4:42 AM, Wendy Lin <wendlin1...@gmail.com> wrote:
> On 12 July 2013 04:35, David Korn <d...@research.att.com> wrote:
>> cc: wendlin1...@gmail.com
>> Subject: Re: [ast-users] ksh -c 'namespace a.c.b { integer i=5 ; } ; ' =>
>> a.c.b: is not an identifier?
>> --------
>>
>>> How do I create a nested namespace?
>>>
>>> I tried this but it fails:
>>> ksh -c 'namespace a.c.b { integer i=5 ; } ; '
>>> /home/wlin/bin/ksh: a.c.b: is not an identifier
>>>
>>> Wendy
>>>
>>
>> namespace a
>> {
>> namespace c
>> {
>> namespace b
>> {
>> integer i=5
>> }
>> }
>> }
>
> I still get an error for this:
> ksh -c 'namespace a { namespace b { integer i=5 ; } ; } ; printf "%d\n"
> .a.b.i'
> /home/wlin/bin/ksh: printf: .a.b.i: no parent
>
> I don't think this is the right way (semantically) because you can't
> switch from namespace a.b.c to namespace b.g.y on the fly.
The following test patch "fixes" the problem:
-- snip --
diff -r -u original/src/cmd/ksh93/sh/xec.c
build_i386_64bit_debug/src/cmd/ksh93/sh/xec.c
--- src/cmd/ksh93/sh/xec.c 2013-07-25 02:37:26.000000000 +0200
+++ src/cmd/ksh93/sh/xec.c 2013-07-28 05:36:31.827214685 +0200
@@ -2710,8 +2710,10 @@
Namval_t *oldnspace = shp->namespace;
int offset = stktell(stkp);
int flag=NV_NOASSIGN|NV_NOARRAY|NV_VARNAME;
+#if 0
if(cp)
errormsg(SH_DICT,ERROR_exit(1),e_ident,fname);
+#endif
sfputc(stkp,'.');
sfputr(stkp,fname,0);
np =
nv_open(stkptr(stkp,offset),shp->var_tree,flag);
-- snip --
If this gets applied then the following sample code finally works:
-- snip --
# the next three lines are placeholders for the parent namespaces
namespace com { true ; }
namespace com.att { true ; }
namespace com.att.research { true ; }
# test namespace for AT&T Research
namespace com.att.research.hello
{
function print_hello
{
print 'Hello World'
}
}
# do somthing
.com.att.research.hello.print_hello
-- snip --
IMO this would finally a major step forward towards a common
function/type library where each party has it's own namespace which is
organised like DNA (see java why this is a good idea)
* Notes:
- At some point namerefs to functions, e.g. typeset -f -n would be
usefull... e.g. nameref -f hello=.com.att.research.hello.print_hello #
would map the function .com.att.research.hello.print_hello to the
short name "hello" without requiring a wrapper function (saving
execution name)
- Known bugs:
$ ksh -c 'namespace a { true ; } ; namespace a.sp1 { integer i=5 ;
function inc { let i++ ; } ; } ; print ${.a.sp1.i} ; .a.sp1.inc ;
print ${.a.sp1.i} ' # print $'5\n5' but should print $'5\n6'
Comments/feedback/rants/etc. wecome...
----
Bye,
Roland
--
__ . . __
(o.\ \/ /.o) roland.ma...@nrubsig.org
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
/O /==\ O\ TEL +49 641 3992797
(;O/ \/ \O;)
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