Execute SNUSP/Tcl: Difference between revisions
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{{implementation|SNUSP}}{{collection|RCSNUSP}}[[Category:Tcl]] |
{{implementation|SNUSP}}{{collection|RCSNUSP}}[[Category:Tcl]] |
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This is an interpreter for |
This is an interpreter for [[SNUSP]]. Appears to work with correct SNUSP programs... |
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<br clear=all> |
<br clear=all> |
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==Core [[SNUSP]]== |
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<lang tcl>package require Tcl 8.5 |
<lang tcl>package require Tcl 8.5 |
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} |
} |
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# An unbounded datastore |
# An unbounded linear datastore |
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set data 0 |
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set dptr 0 |
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proc Get {} { |
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global data dptr |
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if {$dptr < 0} { |
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puts stderr "program error; data pointer too low" |
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return -code break |
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} |
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while {$dptr >= [llength $data]} { |
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lappend data 0 |
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} |
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lindex $data $dptr |
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} |
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proc Set val { |
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global data dptr |
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if {$dptr < 0} { |
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puts stderr "program error; data pointer too low" |
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return -code break |
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} |
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while {$dptr >= [llength $data]} { |
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lappend data 0 |
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} |
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lset data $dptr $val |
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} |
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# The main interpreter loop; $last is used for tracking whether |
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# to terminate output with a newline |
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set last 10 |
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while 1 { |
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switch -- [Char] { |
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"/" {set move "[expr -[lindex $move 1]] [expr -[lindex $move 0]]"} |
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"\\" {set move [lreverse $move]} |
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"?" {if ![Get] Move} |
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"!" {Move} |
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">" {incr dptr} |
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"<" {incr dptr -1} |
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"+" {Set [expr [Get]+1]} |
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"-" {Set [expr [Get]-1]} |
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"." {puts -nonewline [format %c [set last [Get]]]} |
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"," {Set [read stdin 1]} |
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} |
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Move |
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} |
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if {$last != 10} {puts ""}</lang> |
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==Modular [[SNUSP]]== |
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<lang tcl>package require Tcl 8.5 |
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# Basic I/O to read the program data and get ready for execution |
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set f [open [lindex $argv 0]] |
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set data [read $f] |
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close $f |
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fconfigure stdout -buffering none |
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# How to access the program |
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set pc {0 0} |
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set lineNum 0 |
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foreach line [split $data \n] { |
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set idx [string first \$ $line] |
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if {$idx >= 0} { |
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set pc [list $lineNum $idx] |
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} |
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lappend program [split $line ""] |
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incr lineNum |
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} |
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set move {0 1} |
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proc Move {} { |
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global pc move |
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lset pc 0 [expr {[lindex $pc 0] + [lindex $move 0]}] |
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lset pc 1 [expr {[lindex $pc 1] + [lindex $move 1]}] |
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} |
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proc Char {} { |
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global program pc |
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set c [lindex $program $pc] |
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if {$c eq ""} { |
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return -code break |
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} |
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return $c |
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} |
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# An unbounded linear datastore |
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set data 0 |
set data 0 |
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set dptr 0 |
set dptr 0 |
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Revision as of 12:37, 22 May 2009
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>