23 lines
850 B
OCaml
23 lines
850 B
OCaml
open Fieldglass
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let sample : (string * bool, string) lens' =
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lens ~view:fst ~set:(fun value (_, other) -> value, other)
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let () = assert (view sample ("colour", true) = "colour")
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let () =
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let source = "colour", true in
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assert (set sample "grey" source = ("grey", true));
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assert (set sample (view sample source) source = source);
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assert (set sample "blue" (set sample "grey" source) = set sample "blue" source);
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let calls = ref 0 in
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assert (over sample ~f:(fun text -> incr calls; text ^ "s") source = ("colours", true));
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assert (!calls = 1)
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let () =
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let first = (fst, fun value (_, rest) -> value, rest) in
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let second = (snd, fun value (rest, _) -> rest, value) in
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let focus = compose first second in
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assert (view focus ((true, "grey"), false) = "grey");
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assert (set focus 9 ((true, "grey"), false) = ((true, 9), false))
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