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/* Integration Test: Pattern Matching */
/* Combines: case expressions, functions, recursion, complex patterns */
..out "=== Integration Test: Pattern Matching ===";
/* Recursive factorial with case expressions */
factorial : n ->
when n is
0 then 1
_ then n * (factorial (n - 1));
/* Pattern matching with multiple parameters */
classify : x y ->
when x y is
0 0 then "both zero"
0 _ then "x is zero"
_ 0 then "y is zero"
_ _ then when x is
0 then "x is zero (nested)"
_ then when y is
0 then "y is zero (nested)"
_ then "neither zero";
/* Test factorial */
fact5 : factorial 5;
fact3 : factorial 3;
..assert fact5 = 120;
..assert fact3 = 6;
/* Test classification */
test1 : classify 0 0;
test2 : classify 0 5;
test3 : classify 5 0;
test4 : classify 5 5;
..assert test1 = "both zero";
..assert test2 = "x is zero";
..assert test3 = "y is zero";
..assert test4 = "neither zero";
/* Complex nested case expressions */
analyze : x y z ->
when x y z is
0 0 0 then "all zero"
0 0 _ then "x and y zero"
0 _ 0 then "x and z zero"
_ 0 0 then "y and z zero"
0 _ _ then "only x zero"
_ 0 _ then "only y zero"
_ _ 0 then "only z zero"
_ _ _ then "none zero";
result1 : analyze 0 0 0;
result2 : analyze 0 1 1;
result3 : analyze 1 0 1;
result4 : analyze 1 1 1;
..assert result1 = "all zero";
..assert result2 = "only x zero";
..assert result3 = "only y zero";
..assert result4 = "none zero";
..out "Pattern matching integration test completed";
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