Execute SNUSP/Tcl
This is an interpreter for SNUSP. Appears to work with correct SNUSP programs...
Core 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 $c
}
- An unbounded linear datastore
set data 0 set dptr 0 proc Get {} {
global data dptr if {$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 $c
}
- An unbounded linear datastore
set data 0 set dptr 0 proc Get {} {
global data dptr if {$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
}
- An unbounded stack
set stack {} proc Push {} {
global stack pc move set save $pc Move lappend stack [list $pc $move] set pc $save
} proc Pop {} {
global stack pc move if {[llength $stack] == 0} {
return -code break
} lassign [lindex $stack end] pc move set stack [lrange $stack 0 end-1]
}
- 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 $move]} "?" {if ![Get] Move} "!" {Move} ">" {incr dptr} "<" {incr dptr -1} "+" {Set [expr [Get]+1]} "-" {Set [expr [Get]-1]} "." {puts -nonewline [format %c [set last [Get]]]} "," {Set [read stdin 1]} "@" {Push} "#" {Pop}
} Move
} if {$last != 10} {puts ""}</lang>
Bloated 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 stdin -blocking 0 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}
set threads {} set threadID 0 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 ReflectMotion dir {
global move set move "[expr $dir*[lindex $move 1]] [expr $dir*[lindex $move 0]]"
} proc Char {} {
global program pc threads t set c [lindex $program $pc] if {$c eq ""} {
dict unset threads $t return -code continue
} return $c
}
- An unbounded quarter-plane datastore
set data 0 set dptr {0 0} proc Get {} {
global data dptr lindex $data $dptr
} proc Set val {
global data dptr lset data $dptr $val
} proc MovePtr dir {
global dptr data lassign $dptr y x switch $dir {
left {lset dptr 1 [expr $x-1]} right {lset dptr 1 [expr $x+1]} up {lset dptr 0 [expr $y-1]} down {lset dptr 0 [expr $y+1]}
} lassign $dptr y x if {$x < 0 || $y < 0} {
puts stderr "program error; data pointer off top or left ($x,$y)" exit
} while {[llength $data] <= $y} {
lappend data [lrepeat [expr $x+1] 0]
} if {[llength [lindex $data $y]] <= $x} {
set e [lindex $data $y] lset data $y [concat $e [lrepeat [expr $x+1-[llength $e]] 0]]
}
}
- An unbounded stack
set stack {} proc Push {} {
global stack pc move set save $pc Move lappend stack [list $pc $move] set pc $save
} proc Pop {} {
global stack pc move t threads if {[llength $stack] == 0} {
dict unset threads $t return -code continue
} lassign [lindex $stack end] pc move set stack [lrange $stack 0 end-1]
}
dict set threads [incr threadID] [dict create \
pc $pc move $move stack $stack dptr $dptr]
- The main interpreter loop; $last is used for tracking whether to terminate
- output with a newline
set last 10 while {[dict size $threads]} {
foreach t [dict keys $threads] {
dict with threads $t { switch -- [Char] { "/" {ReflectMotion -1} "\\" {ReflectMotion 1} "?" {if ![Get] Move} "!" {Move} ">" {MovePtr right} "<" {MovePtr left} "+" {Set [expr [Get]+1]} "-" {Set [expr [Get]-1]} "." {puts -nonewline [format %c [set last [Get]]]} "," { set c [read stdin 1] if {$c eq ""} continue Set [scan $c %c] } "@" {Push} "#" {Pop} ":" {MovePtr up} ";" {MovePtr down} "%" {Set [expr int((1+[Get]) * rand())]} "&" { Move dict set threads [incr threadID] [dict create \ pc $pc move $move stack {} dptr $dptr] } } Move }
}
} if {$last != 10} {puts ""}</lang>
Test Code
This prints out a random number of random length:
$!/+++++++++%++++++++++++++++++++++++++++++++++++++++++++++++.!/-\ \====================================<#!?%+++++++++++++++>===\?/
This (from the esolangs wiki) prints exclamation marks until you press a key:
/==.==<==\ | | /+++++++++++==&\==>===?!/==<<==# \+++++++++++\ | $==>==+++++++++++/ \==>==,==#