case(3tcl) Tcl Built-In Commands case(3tcl)
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NAME
case - Evaluate one of several scripts, depending on a given value
SYNOPSIS
case string ?in? patList body ?patList body ...?
case string ?in? {patList body ?patList body ...?}
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DESCRIPTION
Note: the case command is obsolete and is supported only for backward
compatibility. At some point in the future it may be removed entirely.
You should use the switch command instead.
The case command matches string against each of the patList arguments
in order. Each patList argument is a list of one or more patterns. If
any of these patterns matches string then case evaluates the following
body argument by passing it recursively to the Tcl interpreter and re-
turns the result of that evaluation. Each patList argument consists of
a single pattern or list of patterns. Each pattern may contain any of
the wild-cards described under string match. If a patList argument is
default, the corresponding body will be evaluated if no patList matches
string. If no patList argument matches string and no default is given,
then the case command returns an empty string.
Two syntaxes are provided for the patList and body arguments. The
first uses a separate argument for each of the patterns and commands;
this form is convenient if substitutions are desired on some of the
patterns or commands. The second form places all of the patterns and
commands together into a single argument; the argument must have proper
list structure, with the elements of the list being the patterns and
commands. The second form makes it easy to construct multi-line case
commands, since the braces around the whole list make it unnecessary to
include a backslash at the end of each line. Since the patList argu-
ments are in braces in the second form, no command or variable substi-
tutions are performed on them; this makes the behavior of the second
form different than the first form in some cases.
SEE ALSO
switch(3tcl)
KEYWORDS
case, match, regular expression
Tcl 7.0 case(3tcl)
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