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(ns jester.comparisons
"Comparison functions to specify how Jester comparisons work.")
(defn string=
"Compare two (potentially-nil) strings. If either is nil, return nil.
Otherwise, return true iff a = b, ignoring case, and false
otherwise."
[^String a, ^String b]
(boolean (and a b (.equalsIgnoreCase a b))))
(defn string<
"Compare two (potentially-nil) strings. If either is nil, return nil.
Otherwise, return true iff a < b, ignoring case, and false
otherwise."
[^String a, ^String b]
(and a b (< (.compareToIgnoreCase a b) 0)))
(defn number=
"Compare two (potentially-nil) numbers. If either is nil, return nil.
If either is NaN, return false. Otherwise, return true iff a = b,
and false otherwise."
[a b]
(boolean (and a b (== a b))))
(defn number<
"Compare two (potentially-nil) numbers. If either is nil, return nil.
If either is NaN, return false. Otherwise, return true iff a < b,
and false otherwise."
[a b]
(boolean (and a b (< a b))))
(defn boolean=
"Compare two (potentially-nil) booleans. If either is nil, return nil.
Otherwise, return true iff a = b, and false otherwise."
[a b]
(boolean (and (some? a) (some? b) (= a b))))
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