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# -*- Tcl -*-
############################################################
# nx-shell.tcl --
#
# Scripted shell (REPL) infrastructure for NX and XOTcl2.
#
# Copyright (C) 2010-2012 Gustaf Neumann
# Copyright (C) 2016 Stefan Sobernig
#
# Vienna University of Economics and Business
# Institute of Information Systems and New Media
# A-1020, Welthandelsplatz 1
# Vienna, Austria
#
# This work is licensed under the MIT License https://www.opensource.org/licenses/MIT
#
# Copyright:
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
package require nx
package provide nx::shell 1.1
nx::Object create ::nx::shell {
:public object method onRead {{chan stdin}} {
append :line [read $chan]
if {[eof $chan]} {
set :forever 0
fileevent $chan readable {}
}
if {${:line} eq "\n"} {
unset :line
:prompt
return
}
if {[info complete ${:line}]} {
:evalScript ${:line}
unset :line
if {![info exists :forever]} {
:prompt
}
}
}
:protected object method evalScript {-exit:switch script} {
set script [list interp invokehidden {} catch [string trim $script] [current]::result [current]::opts]
set r [uplevel #0 $script]
if {$r == 1} {
puts stderr [dict get ${:opts} -errorinfo]
if {$exit} {
:onExit -shell 1
} else {
unset :opts;
}
} elseif {$r == 2 && [info exists :statusCode]} {
set sc ${:statusCode}
unset :statusCode
if {$exit} {
:onExit -shell $sc
} else {
set :forever $sc
}
} else {
if {${:result} ne ""} {
puts stdout ${:result}
}
unset :result
}
}
:protected object method prompt {{chan stdout}} {
puts -nonewline $chan "% "
flush $chan
}
:public object method run {argc argv} {
:exitOn
if {$argc == 0} {
# interactive mode
:prompt stdout
fconfigure stdin -blocking 0 -buffering line
fileevent stdin readable [list [current] onRead]
vwait :forever
fileevent stdin readable {}
:onExit -shell ${:forever}
} else {
# noninteractive modes
:nonInteract {*}$argv
}
:exitOff
return 0
}
:protected object method nonInteract {-c:switch args} {
if {$c} {
# noninteractive mode: arg command xor stdin
if {[llength $args]} {
# arg command plus argc/argv
set args [lassign $args script]
set ::argv $args
set ::argc [llength $args]
} else {
# stdin
set ::argv ""
set ::argc 0
set script [gets stdin]
}
:evalScript -exit $script
} else {
# noninteractive mode: script
set ::argv [lassign $args argv0]
incr ::argc -1
if {[catch {uplevel #0 [list source $argv0]} msg opts]} {
puts [dict get $opts -errorinfo]
exit 1
}
}
}
:public object method onExit {-shell:switch {statusCode 0}} {
if {$shell} {
:exitOff
# outer (shell) exit
return -code ok -level [info level] $statusCode
} else {
# inner (script) exit
set :statusCode $statusCode
return -code return -level [info level]
}
}
:public object method onCatch {args} {
set r [uplevel 1 [list interp invokehidden {} catch {*}$args]]
if {$r == 2 && [info exists :statusCode]} {
return -code return
}
return $r
}
# 8.6 only
if {[info commands ::try] ne ""} {
:public object method onHandler {script} {
if {[info exists :statusCode]} {
return -code return -level 2
}
uplevel 1 $script
}
:public object method onTry {script args} {
set l [llength $args]
for {set i 0; set j 1} {$i < $l} {incr i; set j [expr {$i + 1}]} {
# watch out for the finally handler
if {$i == $l - 2 && [lindex $args $i] eq "finally"} {
set finallyScript [lindex $args $j]
lset args $j [list [current] onHandler $finallyScript]
break
}
# watch out for on-return handlers
if {$i < $l - 3 && [lindex $args $i] eq "on" && [lindex $args $j] in {return 2}} {
# imputate a wrapped return script
set idx [expr {$i + 3}]
set returnScript [lindex $args $idx]
lset args $idx [list [current] onHandler $returnScript]
incr i 3
}
}
uplevel 1 [list interp invokehidden {} try $script {*}$args]
}
}
:public object method exitOn {} {
if {[info commands ::_exit] eq ""} {
#
# exit is already aliased/hidden by nx::test
#
rename ::exit ::_exit
proc ::exit {{exitCode 0}} "[current] onExit \$exitCode"
interp hide {} catch;
interp alias {} ::catch {} [current] onCatch
}
if {[info commands ::try] ne ""} {
# 8.6 only
interp hide {} try;
interp alias {} ::try {} [current] onTry
}
}
:public object method exitOff {} {
if {[info commands ::_exit] ne ""} {
rename ::exit ""
rename ::_exit ::exit
interp alias {} ::catch {}
interp expose {} catch;
if {[interp alias {} ::try] ne ""} {
# 8.6 only
interp alias {} ::try {}
interp expose {} try;
}
}
}
}
package provide nx::shell 1.1
# Local variables:
# mode: tcl
# tcl-indent-level: 2
# indent-tabs-mode: nil
# End:
|
