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# -*- tcl -*-
# # ## ### ##### ######## #############
# (C) 2009 Andreas Kupries
# @@ Meta Begin
# Package tcl::transform::identity 1.1
# Meta as::author {Andreas Kupries}
# Meta as::copyright 2009
# Meta as::license BSD
# Meta as::notes The prototypical observer transformation.
# Meta as::notes To observers what null is to reflected
# Meta as::notes base channels. For other observers see
# Meta as::notes adler32, crc32, counter, and observer
# Meta as::notes (stream copy).
# Meta description Implementation of an identity
# Meta description transformation, i.e one which does not
# Meta description change the data in any way, shape, or
# Meta description form. Based on Tcl 8.6's transformation
# Meta description reflection support. Exports a single
# Meta description command adding a new transform of this
# Meta description type to a channel. One argument, the
# Meta description channel to extend. No result.
# Meta platform tcl
# Meta require tcl::transform::core
# Meta require {Tcl 8.6}
# @@ Meta End
# # ## ### ##### ######## #############
package require Tcl 8.6 9
package require tcl::transform::core
# # ## ### ##### ######## #############
namespace eval ::tcl::transform {}
proc ::tcl::transform::identity {chan} {
::chan push $chan [identity::implementation new]
}
oo::class create ::tcl::transform::identity::implementation {
superclass tcl::transform::core ;# -> initialize, finalize, destructor
method write {c data} {
return $data
}
method read {c data} {
return $data
}
# No partial data, nor state => no flush, drain, nor clear needed.
# # ## ### ##### ######## #############
}
# # ## ### ##### ######## #############
package provide tcl::transform::identity 1.1
return
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