Re: misunderstaning of switch command

At Tue, 24 Jun 2025 08:23:45 -0000 (UTC) Mark Summerfield <m.n.summerfield@gmail.com> wrote:

 
I have a switch command which is doing something I don't expect but I
don't understand what I've done wrong. In this example the default is
always executed but I expect the case before that to be executed.
 
    const UNCOMPRESSED U
    const ZLIB_COMPRESSED Z
    const SAME_AS_PREV >     set filename somefile.txt
    set action "added"
    set kind Z
    switch $kind {
        $::SAME_AS_PREV { puts "unchanged \"$filename\"" }
        $::UNCOMPRESSED { puts "$action \"$filename\"" }
        $::ZLIB_COMPRESSED { puts "$action \"$filename\" (zlib
compressed)" }
        default { puts "!!!!!!!! UNEXPECTED !!!!!!!!" }
    }
 
What am I doing wrong?

switch does NOT evaluate the case labels.  That is, the case labels are
*literally*:

{$::SAME_AS_PREV}, {$::UNCOMPRESSED}, {$::ZLIB_COMPRESSED}

                                                      
 

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