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Under GNU General Public License
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eval(n) Tcl Built-In Commands eval(n)
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NAME
eval - Evaluate a Tcl script
SYNOPSIS
eval arg ?arg ...?
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DESCRIPTION
Eval takes one or more arguments, which together comprise a Tcl script containing one or
more commands. Eval concatenates all its arguments in the same fashion as the concat com-
mand, passes the concatenated string to the Tcl interpreter recursively, and returns the
result of that evaluation (or any error generated by it). Note that the list command
quotes sequences of words in such a way that they are not further expanded by the eval
command.
EXAMPLES
Often, it is useful to store a fragment of a script in a variable and execute it later on
with extra values appended. This technique is used in a number of places throughout the
Tcl core (e.g. in fcopy, lsort and trace command callbacks). This example shows how to do
this using core Tcl commands:
set script {
puts "logging now"
lappend $myCurrentLogVar
}
set myCurrentLogVar log1
# Set up a switch of logging variable part way through!
after 20000 set myCurrentLogVar log2
for {set i 0} {$i<10} {incr i} {
# Introduce a random delay
after [expr {int(5000 * rand())}]
update ;# Check for the asynch log switch
eval $script $i [clock clicks]
}
Note that in the most common case (where the script fragment is actually just a list of |
words forming a command prefix), it is better to use {*}$script when doing this sort of |
invocation pattern. It is less general than the eval command, and hence easier to make |
robust in practice. The following procedure acts in a way that is analogous to the lap-
pend command, except it inserts the argument values at the start of the list in the vari-
able:
proc lprepend {varName args} {
upvar 1 $varName var
# Ensure that the variable exists and contains a list
lappend var
# Now we insert all the arguments in one go
set var [eval [list linsert $var 0] $args]
}
However, the last line would now normally be written without eval, like this: |
set var [linsert $var 0 {*}$args] |
SEE ALSO
catch(n), concat(n), error(n), interp(n), list(n), namespace(n), subst(n), tclvars(n),
uplevel(n)
KEYWORDS
concatenate, evaluate, script
Tcl eval(n)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/2.4.6 (CentOS)
Under GNU General Public License
2025-06-23 22:07 @127.0.0.1 CrawledBy Wget/1.21.2