Could you please help me with the following script?
It is a Tcl script which Synopsys IC Compiler II will source.
set_dont_use [get_lib_cells */*CKGT*0P*] -power
set_dont_use [get_lib_cells */*CKTT*0P*] -setup
May I know how to take only */*CKGT*0P* and */*CKTT*0P* and assign these to a variable.
Of course you can treat a Tcl script as something you search through; it's just a file with text in it after all.
Let's write a script to select the text out. It'll be a Tcl script, of course. For readability, I'm going to put the regular expression itself in a global variable; treat it like a constant. (In larger scripts, I find it helps a lot to give names to REs like this, as those names can be used to remind me of the purpose of the regular expression. I'll call it “RE” here.)
set f [open theScript.tcl]
# Even with 10 million lines, modern computers will chew through it rapidly
set lines [split [read $f] "\n"]
close $f
# This RE will match the sample lines you've told us about; it might need tuning
# for other inputs (and knowing what's best is part of the art of RE writing)
set RE {^set_dont_use \[get_lib_cells ([\w*/]+)\] -\w+$}
foreach line $lines {
if {[regexp $RE $line -> term]} {
# At this point, the part you want is assigned to $term
puts "FOUND: $term"
}
}
The key things in the RE above? It's in braces to reduce backslash-itis. Literal square brackets are backslashed. The bit in parentheses is the bit we're capturing into the term variable. [\w*/]+ matches a sequence of one or more characters from a set consisting of “standard word characters” plus * and /.
The use of regexp has -> as a funny name for a variable that is ignored. I could have called it dummy instead; it's going to have the whole matched string in it when the RE matches, but we already have that in $term as we're using a fully-anchored RE. But I like using -> as a mnemonic for “assign the submatches into these”. Also, the formal result of regexp is the number of times the RE matched; without the -all option, that's effectively a boolean that is true exactly when there was a match, which is useful. Very useful.
To assign the output of any command <command> to a variable with a name <name>, use set <name> [<command>]:
> set hello_length [string length hello]
5
> puts "The length of 'hello' is $hello_length."
The length of 'hello' is 5.
In your case, maybe this is what you want? (I still don't quite understand the question, though.)
set ckgt_cells [get_lib_cells */*CKGT*0P*]
set cktt_cells [get_lib_cells */*CKTT*0P*]
