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Execute SNUSP/Tcl: Difference between revisions
Split into Core and Modular versions
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(Split into Core and Modular versions) |
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{{implementation|SNUSP}}{{collection|RCSNUSP}}[[Category:Tcl]]
This is an interpreter for
<br clear=all>
==Core [[SNUSP]]==
<lang tcl>package require Tcl 8.5
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}
# An unbounded linear datastore
set data 0
set dptr 0
proc Get {} {
global data dptr
if {$dptr < 0} {
puts stderr "program error; data pointer too low"
return -code break
}
while {$dptr >= [llength $data]} {
lappend data 0
}
lindex $data $dptr
}
proc Set val {
global data dptr
if {$dptr < 0} {
puts stderr "program error; data pointer too low"
return -code break
}
while {$dptr >= [llength $data]} {
lappend data 0
}
lset data $dptr $val
}
# The main interpreter loop; $last is used for tracking whether
# to terminate output with a newline
set last 10
while 1 {
switch -- [Char] {
"/" {set move "[expr -[lindex $move 1]] [expr -[lindex $move 0]]"}
"\\" {set move [lreverse $move]}
"?" {if ![Get] Move}
"!" {Move}
">" {incr dptr}
"<" {incr dptr -1}
"+" {Set [expr [Get]+1]}
"-" {Set [expr [Get]-1]}
"." {puts -nonewline [format %c [set last [Get]]]}
"," {Set [read stdin 1]}
}
Move
}
if {$last != 10} {puts ""}</lang>
==Modular [[SNUSP]]==
<lang tcl>package require Tcl 8.5
# Basic I/O to read the program data and get ready for execution
set f [open [lindex $argv 0]]
set data [read $f]
close $f
fconfigure stdout -buffering none
# How to access the program
set pc {0 0}
set lineNum 0
foreach line [split $data \n] {
set idx [string first \$ $line]
if {$idx >= 0} {
set pc [list $lineNum $idx]
}
lappend program [split $line ""]
incr lineNum
}
set move {0 1}
proc Move {} {
global pc move
lset pc 0 [expr {[lindex $pc 0] + [lindex $move 0]}]
lset pc 1 [expr {[lindex $pc 1] + [lindex $move 1]}]
}
proc Char {} {
global program pc
set c [lindex $program $pc]
if {$c eq ""} {
return -code break
}
return $c
}
# An unbounded linear datastore
set data 0
set dptr 0
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