Tcl Source Code

In the discussions about TIP 53

http://purl.org/tcl/tip/53.html

Miguel Sofer counter-proposed an approach
where Tcl would add a single special
built-in command [tcl::nop], and then the
[assert] functionality (and more!) could
be defined in terms of [tcl::nop] as a
separate package.

Here is a patch Miguel and I have produced
that implements tcl::nop.  Try it!

The result of [tcl::nop] is always an empty string.
When bytcode compiled, [tcl::nop] does nothing and its
arguments are not substituted.  When not byte-code
compiled (very unusual), [tcl::nop] behaves exactly
like

proc tcl::nop args {}

so its arguments are substituted, but it still does
nothing.

File Added - 10605: noopProc.patch.final

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noopProc.patch.final committed - diff to previous is just in
comments and formatting.

File Added - 9657: noopProc.patch

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Following Brent Welch's excellent suggestion: giving [proc]
the smarts to bytecompile a [noop], instead of defining a
new command -->noopProc.patch

Currently only will be bytecompiled to noop procs of the
form
   proc a xxxx yyyy
where the arglist xxxx's string rep contains just spaces and
the word 'args', and the body yyyy's string rep contains
just spaces, tabs or newlines.

I.e,
   proc a { args } {  }
will be bytecompiled, but
   proc b { args } #
will not.

Maybe this ticket should move from "Feature Request" to
"Patch"?

File Added - 9618: nop4.patch

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New nop4.patch: standard argument substitution, always
byte-compiled, fastest execution.

File Added - 9609: nop3.patch

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nop3.patch is a new version that takes a different approach
to argument substitutions:
- if no argument to tcl::nop would require substitutions, it
byte-compiles
- otherwise, it calls the command

This does not break the standard Tcl syntax; tcl::nop does
not work as a comment any longer:
   tcl::nop [incr foo]
does cause an increment in foo (and isn´t bcc'ed), whereas
   tcl::nop {[incr foo]}
is bcc'ed and doesn't change foo

File Deleted - 9586:

File Added - 9600: nop2.patch

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Fixing a bug (maxStackDepth should be 1, not 0). Sorry ...

File Added - 9586: nop.patch