49 lines
1,013 B
Tcl
49 lines
1,013 B
Tcl
package require Tcl 8.6
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oo::class create Fractran {
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variable fracs nco
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constructor {fractions} {
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set fracs {}
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foreach frac $fractions {
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if {[regexp {^(\d+)/(\d+),?$} $frac -> num denom]} {
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lappend fracs $num $denom
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} else {
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return -code error "$frac is not a supported fraction"
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}
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}
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if {![llength $fracs]} {
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return -code error "need at least one fraction"
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}
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}
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method execute {n {steps 15}} {
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set co [coroutine [incr nco] my Generate $n]
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for {set i 0} {$i < $steps} {incr i} {
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lappend result [$co]
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}
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catch {rename $co ""}
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return $result
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}
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method Step {n} {
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foreach {num den} $fracs {
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if {$n % $den} continue
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return [expr {$n * $num / $den}]
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}
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return -code break
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}
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method Generate {n} {
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yield [info coroutine]
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while 1 {
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yield $n
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set n [my Step $n]
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}
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return -code break
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}
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}
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set ft [Fractran new {
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17/91 78/85 19/51 23/38 29/33 77/29 95/23
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77/19 1/17 11/13 13/11 15/14 15/2 55/1
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}]
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puts [$ft execute 2]
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