How to access .txt file using tcl PROC function - tcl

Question

I have two files and I am comparing specific lines between two files using the def function.
def readPinFile(filename):
result = None
with open(filename, "r") as file:
result = {}
lastPin = None
for line in file:
lines = line.strip()
if lines[:3] == "PIN":
lastPin = lines.split(" ")[1]
result[lastPin] = {"LAYER": None, "RECT": None}
if lines[:5] == "LAYER":
result[lastPin]["LAYER"] = lines.split(" ")[1]
if lines[:4] == "RECT":
result[lastPin]["RECT"] = lines.split(" ")
return result
pin_of_file1 = readPinFile("osi_hbmp_top_briscm_1.lef") #lef file1
pin_of_file2 = readPinFile("osi_hbmp_top_briscm_2.lef")#lef file2
comparing between pins
with open("file04.txt", "r+") as output_file4: #compare same pins with layer and location
for pin, pin_data in pin_of_file1.items():
if pin in pin_of_file2:
if pin_of_file2[pin]["LAYER"] == pin_data["LAYER"] and pin_of_file2[pin]["RECT"] == pin_data["RECT"]:
output_file4.write(pin + "\n\n")
The TCL code I tried to get the same output
proc fileinput {filename} {
set filedata [open filename r]
set file1 [ read $filedata ]
foreach line [split $file1 \n] {
set pindata { PIN { LAYER {} RECT {} }}
if {[string match *PIN* $line]} {
dict lappend pindata PIN $line
}
if {[string match *LAYER* $line]} {
dict lappend pindata PIN {LAYER{$line}}
}
if {[string match *RECT* $line]} {
dict lappend pindata PIN {RECT{$line}}
}
}
return $pindata
}
set fileinput1 [fileinput osi_hbmp_top_briscm_1.txt]
set fileinput2 [fileinput osi_hbmp_top_briscm_2.txt]
In tcl I am trying to write comparing between the pins section, but I am stuck in the middle. i am fully confused to continue this code
foreach $pin, $pin_data [gets $fileinput1]
if{[string match $pin $fileinput2]}
This is the code I tried

Answer 1

The error trace tells you the immediate problem:
couldn't open "filename": no such file or directory
while executing
"open filename r"
(procedure "fileinput" line 2)
You need to give the name of the file, not the name of the variable containing the file name. Tcl cares about whether things are uses or references/names a lot. You fix this by using:
set filedata [open $filename r]
in the procedure; the added $ is vital as it says "read from the variable and use its value here".