The problem often comes up "I have a string with quoted sections, I want to perform (some operation) on it, how do I do it?" A lot of time is spent playing with regexps, which can't really ever work. I decided to try to write a canonical parser for quoted expressions. I hope others will suggest better models, and that in the end we will have an implementation worthy of going into tcllib. CMcC 26Jun2012
There's also a Parse Parenthesis equivalent.
proc quopar {str {q \"}} {
set depth 0
set result {}
set skip 0
foreach c [split $str ""] {
if {$c eq "\\"} {
append run $c
incr skip
} elseif {$skip} {
append run $c
set skip 0
continue
}
if {$c eq $q} {
if {[info exists run]} {
lappend result $depth $run
unset run
}
set depth [expr {($depth+1)%2}]
} else {
append run $c
}
}
if {$depth > 0} {
error "quopar dangling '$q' in '$str'"
}
if {[info exists run]} {
lappend result $depth $run
}
return $result
}
if {[info exists argv0] && $argv0 eq [info script]} {
package require tcltest
namespace import ::tcltest::*
verbose {pass fail error}
set count 0
foreach {str result} {
{""} ""
{"\""} {1 {\\"}}
{""""} ""
{"moop"} "1 moop"
{pebbles "fred wilma" bambam "barney betty"} "0 {pebbles } 1 {fred wilma} 0 { bambam } 1 {barney betty}"
} {
test quopar-[incr count] {} -body {
quopar $str
} -result $result
}
foreach {str} {
{"}
{"""}
} {
test quopar-[incr count] {} -body {
quopar $str
} -match glob -result * -returnCodes 1
}
}