On 28 July 2013 06:17, Roland Mainz <roland.ma...@nrubsig.org> wrote:
> 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...
I like it. It improves a lot over perl module madness.
One rfe: mkdir has option -p to create missing parent dirs. Could you
add namespace -p to add missing namespaces, i.e. create empty
namespaces if they are not set yet?
Aside from namespace -p the idea of adding namespaces like a DNS tree is GREAT!!
Wendy
_______________________________________________
ast-users mailing list
ast-users@lists.research.att.com
http://lists.research.att.com/mailman/listinfo/ast-users
