This is a little script I Dan Smart use to check that my brackets balance, there are numerous more powerful tools around, but this quickly finds my most common mistake.
proc K {x y} {set x}
proc popBack {lst} {
upvar 1 $lst l
if {[llength $l]} {
set r [lindex $l end]
set l [lreplace [K $l [set l {}]] end end]
} else {
error "pop of empty list"
}
return $r
}
proc fileread {name} {
set chan [open $fname "r"]
fconfigure $chan -encoding binary
set contents [::read $chan]
close $chan
return $contents
}
proc main {argv} {
foreach {oparen cparen osquare csquare obrace cbrace} {
\( \) \[ \] \{ \}
} {}
set script [fileread $argv]
set ie [string length $script]
set ln 1
set plist [list]
for {set is 0} {$is < $ie} {incr is} {
set char [string index $script $is]
switch -exact -- $char $oparen {
lappend plist [list $oparen $cparen $ln]
} $osquare {
lappend plist [list $osquare $csquare $ln]
} $obrace {
lappend plist [list $obrace $cbrace $ln]
} $cparen - $csquare - $cbrace {
if {[catch {popBack plist} last]} {
puts "No matching open for $char on $ln"
} elseif {![string equal [lindex $last 1] $char]} {
puts "Mismatched [lindex $last 0]$char open: [lindex $last 2] close: $ln"
exit 1
}
} "\n" {
incr ln
}
}
if {[llength $plist]} {
puts "Missing closes for: "
while {[llength $plist]} {
set last [popBack plist]
puts "[lindex $last 0] on line $ln"
}
}
}
main $argv