TABLE OF CONTENTS
::pwtk::parseRangeString
SYNOPSIS
proc ::pwtk::parseRangeString {rangeString lastIndex} {
PURPOSE
Evaulate the range-string and expand it into explicit list of indices. The ranges can be specified as follows (note that commas are optional):
1, 2, 5, 6 -- this expands to 1 2 5 6 1, 4-8, 11 -- this expands to 1 4 5 6 7 8 11 -5 -- this expands to 1 2 3 4 5 5- -- this expands to 5 6 7 ... lastIndex 5-end -- this expands to 5 6 7 ... lastIndex 5-last -- this expands to 5 6 7 ... lastIndex all -- this expands to 1 2 3 ... lastIndex begin-last -- this expands to 1 3 4 ... lastIndex first-last -- this expands to 1 3 4 ... lastIndex
ARGUMENTS
- rangeString -- rangeString to parse (i.e. expands)
- lastIndex -- the largest index (used for "all" and "number-" forms)
SOURCE
if { $rangeString eq {} } { return {} } set rangeString [normalizeRangeString_ $rangeString] if { [string match all [string trim $rangeString '\"]] } { set rangeString "1-" } # replace "end" and "last" with $lastIndex set rangeString [regsub -all {(end|last)} $rangeString $lastIndex] set rangeString [regsub -all {(begin|first|1st)} $rangeString 1] foreach item $rangeString { # check for syntax correctness, possible values: # digit, digit-digit, digit-, -digit if { ! [regexp {^[0-9]+-?[0-9]*$} $item] && ! [regexp {^-?[0-9]*$} $item] } { ::pwtk::error "syntax error in range specification: $rangeString" 1 } append range "[expandSequenceString_ $item $lastIndex] " } return $range }