126 lines
5.1 KiB
AppleScript
126 lines
5.1 KiB
AppleScript
set codeString to text returned of (display dialog "Enter BF code:" buttons "OK" default answer "")
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set inputString to text returned of (display dialog "Enter input string" buttons "OK" default answer "")
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set codePointer to 1
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set loopPosns to {}
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set tape to {}
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set tapePointer to 1
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set output to {}
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set inputPointer to 1
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set step to 0
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set thePath to (path to desktop as Unicode text) & "log.txt"
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set debug to (open for access file thePath with write permission)
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write (step as string) & " (" & ((codePointer - 1) as string) & "): (The program contains " & ((length of codeString) as string) & " instructions.)
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" to debug
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set step to 1
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on betterMod(x, y) -- so -2 mod 256 is 254 instead of -2
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local x
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local y
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try
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return -y * (round (x / y) rounding down) + x
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on error eMsg number eNum
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error "Can't call betterMod() on " & eMsg number eNum
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end try
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end betterMod
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repeat while codePointer ≤ length of codeString
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set theChar to (get character codePointer of codeString)
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if (theChar = "+") then
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repeat while (length of tape < tapePointer)
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set tape to tape & 0
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end repeat
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set item tapePointer of tape to betterMod(((get item tapePointer of tape) + 1), 256)
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | a[" & ((tapePointer - 1) as string) & "]= " & ((item tapePointer of tape) as string) & "
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" to debug
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else if (theChar = "-") then
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repeat while (length of tape < tapePointer)
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set tape to tape & 0
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end repeat
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set item tapePointer of tape to betterMod(((get item tapePointer of tape) - 1), 256)
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | a[" & ((tapePointer - 1) as string) & "]= " & ((item tapePointer of tape) as string) & "
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" to debug
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else if (theChar = "<") then
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set tapePointer to tapePointer - 1
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | array pos. now " & ((tapePointer - 1) as string) & "
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" to debug
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else if (theChar = ">") then
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set tapePointer to tapePointer + 1
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | array pos. now " & ((tapePointer - 1) as string) & "
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" to debug
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else if (theChar = "[") then
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repeat while (length of tape < tapePointer)
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set tape to tape & 0
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end repeat
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | Array[" & ((tapePointer - 1) as string) & "] is '" & ((item tapePointer of tape) as string) & "'" to debug
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if (item tapePointer of tape ≠ 0) then
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set loopPosns to loopPosns & codePointer
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write " ** Loop nesting level: " & (((length of loopPosns) - 1) as string) & ".
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" to debug
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else
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write "
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" & (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | Not entering a loop but skipping to instruction number " to debug
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set matchLoops to 1
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repeat while matchLoops ≠ 0
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set codePointer to codePointer + 1
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if (item codePointer of codeString = "[") then
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set matchLoops to matchLoops + 1
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else if (item codePointer of codeString = "]") then
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set matchLoops to matchLoops - 1
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end if
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end repeat
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write ((codePointer - 1) as string) & "
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" to debug
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end if
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else if (theChar = "]") then
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repeat while (length of tape < tapePointer)
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set tape to tape & 0
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end repeat
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | Array[" & ((tapePointer - 1) as string) & "] is '" & ((item tapePointer of tape) as string) & "'
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" to debug
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if (item tapePointer of tape ≠ 0) then
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | looping back to " & (((item (length of loopPosns) of loopPosns) - 1) as string) & "
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" to debug
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set codePointer to (item (length of loopPosns) of loopPosns) - 1
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end if
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if (length of loopPosns > 1) then
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set loopPosns to items 1 thru ((length of loopPosns) - 1) of loopPosns
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else
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set loopPosns to {}
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end if
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else if (theChar = ".") then
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repeat while (length of tape < tapePointer)
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set tape to tape & 0
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end repeat
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | output '" & ((item tapePointer of tape) as string) & "' " & string id (item tapePointer of tape) & "
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" to debug
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set output to output & item tapePointer of tape
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else if (theChar = ",") then
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repeat while (length of tape < tapePointer)
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set tape to tape & 0
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end repeat
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if (inputPointer > length of inputString) then
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set inputPointer to 1
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end if
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set item tapePointer of tape to id of item inputPointer of inputString
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set inputPointer to inputPointer + 1
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write (step as string) & " (" & ((codePointer - 1) as string) & "): " & (item codePointer of codeString) & " | read in " & string id (item tapePointer of tape) & " (" & ((item tapePointer of tape) as string) & ")
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" to debug
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end if
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set codePointer to codePointer + 1
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set step to step + 1
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end repeat
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set strout to string id output
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display dialog strout
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close access debug
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