Add command-line interface ./match (adapted from POPL 2012 version).

[match/match.git] / program / ArrayStuff.hs

diff --git a/program/ArrayStuff.hs b/program/ArrayStuff.hs
index ceb7516..df0a969 100644 (file)
--- a/program/ArrayStuff.hs
+++ b/program/ArrayStuff.hs
@@ -15,6 +15,9 @@ array2DtoListOfLists arr =
        let ((xlo, ylo), (xhi, yhi)) = bounds arr in
        map (\x -> map (\y -> arr ! (x, y)) $ range (ylo, yhi)) $ range (xlo, xhi)
 
+listOfListsToArray2D ll =
+       listArray ((0, 0), (length ll - 1, length (head ll) - 1)) $ concat ll
+
 -- Use instead of amap when the array implementation needs to change.
 -- E.g., mapping an unboxed array to an array whose elements must be boxed.
 amap2 f arr = funcArray (bounds arr) (\i -> f (arr ! i))