/usr/share/tcltk/tcllib1.17/string/token.tcl is in tcllib 1.17-dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## Copyright (c) 2013 Andreas Kupries, BSD licensed
# # ## ### ##### ######## ############# #####################
## Requisites
package require Tcl 8.5
package require fileutil ;# cat
# # ## ### ##### ######## ############# #####################
## API setup
#
namespace eval ::string::token {
namespace export chomp file text
namespace ensemble create
}
## NOTE: We are placing the 'token' ensemble command into the Tcl
## core's builtin 'string' ensemble.
apply {{} {
set map [namespace ensemble configure ::string -map]
dict set map token ::string::token
namespace ensemble configure ::string -map $map
return
}}
# # ## ### ##### ######## ############# #####################
## API
proc ::string::token::file {map path args} {
return [text $map [fileutil::cat {*}$args $path]]
}
proc ::string::token::text {map text} {
# map = dict (regex -> label)
# note! order is important, most specific to most general.
# result = list (token)
# where
# token = list(label start-index end-index)
set start 0
set result {}
# status values:
# 0: no token found, abort
# 1: token found, continue
# 2: no token found, end of string reached, stop, ok.
set status 1
while {$status == 1} {
set status [chomp $map start $text result]
}
if {$status == 0} {
return -code error \
-errorcode {STRING TOKEN BAD CHARACTER} \
"Unexpected character '[string index $text $start]' at offset $start"
}
return $result
}
# # ## ### ##### ######## ############# #####################
## Internal, helpers.
proc ::string::token::chomp {map sv text rv} {
upvar 1 $sv start $rv result
# Stop when trying to match after the end of the string.
if {$text eq {}} {return 2}
if {$start >= [string length $text]} {return 2}
#puts |$start||[string range $text $start end]||$result|
foreach {pattern label} $map {
if {![regexp -start $start -indices -- \\A($pattern) $text -> range]} continue
lappend result [list $label {*}$range]
lassign $range a e
#puts MATCH|$pattern|[string range $text $a $e]|
set start $e
incr start
return 1
}
return 0
}
# # ## ### ##### ######## ############# #####################
## Ready
package provide string::token 1
return
|