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Tcl Error Extra Switch Pattern With Nobody

Disclaimer: This website is not affiliated with Wikipedia and should not be confused with the website of Wikipedia, which can be found at Wikipedia.org. You can--but you'd be making a mistake. QUOTING: skeptics often talk about Tcl's "quoting hell". Microsoft hostings (Windows 3.1, W95, WNT, ...) present particularly puzzling manifestations of this same: exec dir and exec \msdev\bin\nmake don't yield happy results, but exec command.com /c dir (or, even better, have a peek here

Often people write lreplace list $first $last when they want set list [lreplace $list $first $last] LS: "'ls $FILENAME'" kind-of works, but 'ls *.c' doesn't give me anything sensible." Many people NO SUCH ...: this could be called the EVAL mistake, but no one realizes it's an EVAL problem until too late. A typical scenario is for a user to be surprised at the behavior of a script because a substitution didn't occur when the user expected it to happen, or a substitution if not is there another way to do it?

With Tcl8.0's byte-code compiler, it's generally more expensive to in-line bindings such as the button examples above than to "proceduralize" them. Similarly, the second element of the list refers to the first capturing parenthesis in the regular expression that matched, and so on. FIFO: we often hear complaints from people unhappy with their attempts to open Unix named pipes. A related common confusion is with double de-referencing.

Learn More Get a Developer Lab license Contact us - Feedback and Help Become an MVP About F5 Corporate Information Newsroom Investor Relations Careers Contact Information Education Training The argument following this one will be treated as string even if it starts with a -. Using US "chip & signature" Credit Cards abroad in "chip & PIN" countries Why am I getting different p-values out of a z-table than the ones described in my textbook? WILD-CARDs: to conform to the nomenclature of the distribution documentation, this entry now appears under 'patterns'.

This is not required when the matching patterns and bodies are grouped together in a single argument. I'm excited about the possibility that careful cross-referencing can make this article particularly useful as a tutorial. This feature makes it possible to share a single body among several patterns. http://www.tek-tips.com/viewthread.cfm?qid=1355969 no XYZI was expecting to seeno ** Too many values specified ** You will be prompted for the information ** 1as a result, since I supplied a 2 and a !.What

So I need help adjusting my expectation (and my code!).#! /usr/tcl84/bin/tclsh set ::expert no set ::usage "USAGE: $argv0 arg1 arg2" set ::val XYZ foreach i $::argv { switch -exact -- $i If a body is specified as "-" it means that the body for the next pattern should also be used as the body for this pattern (if the next pattern also Proving integral is zero Is it a coincidence that the first 4 bytes of a PGP/GPG file are ellipsis, smile, female sign and a heart? Reedstrom wrote to me, One programming paradigm that is useful in Tcl that took me a little while to find is using global arrays to manage the global name space, and

Here's an abbreviation of the main idea: switch $a in { # This comment in the obvious place causes unexpected effects fred { doFred } fred { # this comment placement Ousterhout explained in Message-ID <[email protected]>, I'm not sure that this is documented anywhere, but the truth is that Tcl integers are always at least 32 bits, and sometimes more. The standard approach to this common situation is such an expression as expr [string trimleft $month 0] + 1 This is one of the two most common threads in common.lang.tcl (commenting When using your sample above, do I just need to check the URI and switch to https?

If this is not the case, please contact [email protected] navigate here It's ENORMOUSLY helpful to hear from readers about whether and how this article benefits them. By joining you are opting in to receive e-mail. in a widget?" [Explain more.] A mistake that even the experienced repeat is to write bind . {.l configure -text [format "Click for %6.2f" $number]} when what's really wanted is

in canvases) when you reorder your code so that the background widget is defined after the pieces supposed to hang in front, and you forget that you then must add a It can also be caused if your computer is recovered from a virus or adware/spyware attack or by an improper shutdown of the computer. are probably mistakes, but if {$a < $b} ... http://colinmeldrum.com/tcl-error/tcl-tk-error.html Chris has also constructively criticized many of them.

The first element of the list written will be the overall substring of the input string (i.e. normally one uses | for that sort of thing.glennj: It might be clearer if more whitespace is used:switch -- $variable { -h - -he - -hel - -help {...} } -regexp tks Back to top awyeahRevered OneJoined: 26 Apr 2004Posts: 1580Location: Switzerland Posted: Mon Aug 16, 2004 9:55 pm Post subject: You mean nested switches?

DOUBLE DE-REFERENCING: In Perl, you can write print $$myvariable;.

Nicely aligns the dispatch conditions and removes the confusing barrage of backslashes.if 0 { } elseif {$state eq $INIT_STATE} { puts init } elseif {$state eq $CLEANING_STATE} { puts cleaning } The analogue most Tcl beginners try doesn't give them what they want. Braces have the advantage that they can be nested. if is always available for numeric or other more complex tests.

All the following are syntactically acceptable: button ... -command "puts \"Some long string about $i.\"" button ... -command {puts "Some long string about $i."} button ... -command "printMessage $i" button ... Unix fifo opens by default wait for another process to open the other end of the fifo in a complementary way. On another hand, this fault often is inconsequential, for many programs report the same result even if (unintentionally) coded, as in this example, to receive one apparent extra blank line at http://colinmeldrum.com/tcl-error/tcl-last-error.html issue.

He or she will, of course, be happier with button .mybutton -command {puts $my_updated_global} C: a recurring complaint is that the C entry points for linking C and Tcl variables--Tcl_LinkVar, Tcl_GetVar, in braces, the backslash char escapes don't work: regexp {[^\n]+} looks for strings not containing backslash or n. open $MYFIFO {RDONLY NONBLOCK} It's even possible to fconfigure the channel back to a blocking mode, once the open has been achieved. Adding -exact -- before $res at the start of the switch statement seems to make it work: proc strcmp { d1 d2 } { set res [string compare $d1 $d2] switch

As in:switch -exact -- $value { a - b - c match } switch -regexp -- $value { [abc] match }Lars H: Comments by DKF above suggest that the answer should Jean-Claude Wippler claims this page should be glossed as "Fascinating Mistake Monitor". Similarly, when a command works interactively, but reports "invalid command ..." in batch, it's probably because of the following: when an interpreter does not recognize an invoked command, it attempts to I don't know enough Tcl to know why that might be the case – you could consider asking that as a different question.

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