Haskell Quiz/Bytecode Compiler: Difference between revisions
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==Solutions== | ==Solutions== | ||
* [[Haskell Quiz/Bytecode Compiler/Solution Michael Sloan|Michael Sloan]] | * [[Haskell Quiz/Bytecode Compiler/Solution Michael Sloan|Michael Sloan]] | ||
* [[Haskell Quiz/Bytecode Compiler/Solution Justin Bailey|Justin Bailey]] | * [[Haskell Quiz/Bytecode Compiler/Solution Justin Bailey|Justin Bailey]] | ||
* A (non-monadic) solution to the parsing and eval part of this quiz is a [http://www.cs.kent.ac.uk/people/staff/sjt/craft2e/Code/Parsing/Parsing.hs case study] in Chapter 17 of [http://www.cs.kent.ac.uk/people/staff/sjt/craft2e The Craft of Functional Programming] by Simon Thompson. | * A (non-monadic) solution to the parsing and eval part of this quiz is a [http://www.cs.kent.ac.uk/people/staff/sjt/craft2e/Code/Parsing/Parsing.hs case study] in Chapter 17 of [http://www.cs.kent.ac.uk/people/staff/sjt/craft2e The Craft of Functional Programming] by Simon Thompson. | ||
Revision as of 15:17, 7 November 2006
The Problem
Create a bytecode compiler as described on this ruby quiz page: http://www.rubyquiz.com/quiz100.html
Use this tester by Michael Sloan:
fromBytes n = foldl (\c (i, n) -> c + n * 2^(i*8) ) 0 . zip [(n-1),(n-2)..0]
interpret [] [] = error "no result produced"
interpret (s1:s) [] = s1
interpret s (o:xs) | o < 10 = interpret ((fromBytes (o*2) xs):s) (drop (o*2) xs)
interpret (s1:s2:s) (o:xs)
| o == 16 = interpret (s2:s1:s) xs
| otherwise = interpret (((case o of 10 -> (+); 11 -> (-); 12 -> (*); 13 -> (^); 14 -> div; 15 -> mod) s2 s1):s) xs
test :: (String -> [Int]) -> IO ()
test f = assert "2+5" 7 >> assert "2-1" 1 >> assert "2*12" 24 >> assert "2^3" 8 >> assert "5/2" 2 >> assert "15%4" 3 >>
assert "2+2+2" 6 >> assert "2^8/4" 64 >> assert "3*11%3" 6 >>
assert "2*(3+4)" 14 >> assert "(3/3)+(8-2)" 7 >> assert "(1+3)/(2/2)*(10-8)" 8 >> assert "(10%3)*(2+2)" 4 >>
assert "(10/(2+3)*4)" 8 >> assert "5+((5*4)%(2+1))" 7 >> assert "-(2-3-5)" 10
where assert str val = print ((if (interpret [] $ f str) == val then "Passed: " else "Failed: ") ++ str)Solutions
- A (non-monadic) solution to the parsing and eval part of this quiz is a case study in Chapter 17 of The Craft of Functional Programming by Simon Thompson.