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# tie_array.tcl --
#
# Data source: Tcl array.
#
# Copyright (c) 2004 Andreas Kupries <andreas_kupries@users.sourceforge.net>
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# RCS: @(#) $Id: tie_array.tcl,v 1.3 2005/09/28 04:51:24 andreas_kupries Exp $
# ### ### ### ######### ######### #########
## Requisites
package require snit
package require tie
# ### ### ### ######### ######### #########
## Implementation
snit::type ::tie::std::array {
# ### ### ### ######### ######### #########
## Specials
pragma -hastypemethods no
pragma -hasinfo no
pragma -simpledispatch yes
# ### ### ### ######### ######### #########
## API : Construction & Destruction
constructor {rvar} {
# Bring reference to the array into the object scope,
# i.e. namespace of the object. This will fail for proc local
# variables. This latter is enforced by the core, to prevent
# the existence of dangling references to the variable when
# the procedure goes away.
# upvar 3, because we have to skip 3 snit internal levels to
# access the callers level.
if {[catch {
upvar 3 $rvar ${selfns}::thesource
}]} {
return -code error "Illegal use of proc local array variable \"$rvar\""
}
# Now bring the variable into method scope as well, to check
# for its existence.
variable ${selfns}::thesource
if {![array exists thesource]} {
return -code error "Undefined source array variable \"$rvar\""
}
return
}
# ### ### ### ######### ######### #########
## API : Data source methods
method get {} {
variable ${selfns}::thesource
return [array get thesource]
}
method set {dict} {
variable ${selfns}::thesource
return [array set thesource $dict]
}
method unset {{pattern *}} {
variable ${selfns}::thesource
array unset thesource $pattern
return
}
method names {} {
variable ${selfns}::thesource
return [array names thesource]
}
method size {} {
variable ${selfns}::thesource
return [array size thesource]
}
method getv {index} {
variable ${selfns}::thesource
return $thesource($index)
}
method setv {index value} {
variable ${selfns}::thesource
set thesource($index) $value
return
}
method unsetv {index} {
variable ${selfns}::thesource
unset thesource($index)
return
}
# ### ### ### ######### ######### #########
## Internal : Instance data
## During construction the source array variable is imported into
## the namespace of the object, for direct access through a
## constant name. This also allows a direct reference without
## having to deal with changing stack scopes. This is possible if
## and only if the imported array is a namespaced variable. Proc
## local variables cannot be imported into a namespace in this
## manner. Trying to do so results in an error.
# ### ### ### ######### ######### #########
}
# ### ### ### ######### ######### #########
## Ready to go
::tie::register ::tie::std::array as array
package provide tie::std::array 1.0
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