splitting input line with varying formats in tcl with - tcl

Question

Good afternoon,
I am attempting to write a tcl script which given the input file
input hreadyin;
input wire htrans;
input wire [7:0] haddr;
output logic [31:0] hrdata;
output hreadyout;
will produce
hreadyin(hreadyin),
htrans(htrans),
haddr(haddr[7:0]),
hrdata(hrdata[31:0]),
hready(hreadyout)
In other words, the format is:
<input/output> <wire/logic optional> <width, optional> <paramName>;
with the number of whitespaces unrestricted between each of them.
I have no problem reading from the input file and was able to put each line in a $line element. Now I have been trying things like:
set param0 [split $line "input"]
set param1 [lindex $param0 1]
But since not all lines have "input" line in them i am unable to get the elements i want (the name and the width if it exists).
Is there another command in tcl capable for doing this kind of parsing?

Answer 1

The regexp command is useful to find words separated by arbitrary whitespace:
while {[gets $fh line] != -1} {
# get all whitespace-separated words in the line, ignoring the semi-colon
set i [string first ";" $line]
set fields [regexp -inline -all {\S+} [string range $line 0 $i-1]]
switch -exact -- [llength $fields] {
2 - 3 {
set name [lindex $fields end]
puts [format "%s(%s)," $name $name]
}
4 {
lassign $fields - - width name
puts [format "%s(%s%s)," $name $name $width]
}
}
}

Answer 2

I think you should look at something like
# Compress all multiple spaces to single spaces
set compressedLine [resgub " +" $line " "]
set items [split [string range $compressedLine 0 end-1] $compressedLine " "]
switch [llength $items] {
2 {
# Handle case where neither wire/logic nor width is specificed
set inputOutput [lindex $items 0]
set paramName [lindex $items 1]
.
.
.
}
4 {
# Handle case where both wire/logic and width are specified
set inputOutput [lindex $items 0]
set wireLogic [lindex $items 1]
set width [lindex $items 2]
set paramName [lindex $items 3]
.
.
.
}
default {
# Don't know how to handle other cases - add them in if you know
puts stderr "Can't handle $line
}
}
I hope it's not legal to have exactly one of wire/logic and width specified - you'd need to work hard to determine which is which.
(Note the [string range...] fiddle to discard the semicolon at the end of the line)

Answer 3

Or if you can write up a regex that catches the right data, you can do this with this:
set data [open "file.txt" r]
set output [open "output.txt" w]
while {[gets $data line] != -1} {
regexp -- {(\[\d+:\d+\])?\s*(\w+);} $line - width params
puts $output "$params\($params$width\),"
}
close $data
close $output
This one will also print the comma you have inserted in your expected output, but will insert it in the last line as well so you get:
hreadyin(hreadyin),
htrans(htrans),
haddr(haddr[7:0]),
hrdata(hrdata[31:0]),
hready(hreadyout),
If you don't want it and the file is not too large (apparently the limit is 2147483672 bytes for a list, which I'm gonna use), you could use a group like this:
set data [open "file.txt" r]
set output [open "output.txt" w]
set listing "" #Empty list
while {[gets $data line] != -1} {
regexp -- {(\[\d+:\d+\])?\s*(\w+);} $line - width params
lappend listing "$params\($params$width\)" #Appending to list instead
}
puts $output [join $listing ",\n"] #Join all in a single go
close $data
close $output