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type inferencing "unifying" operation is now bi-directional + begin writing generic version of "unifying" operation (that should work on all types)

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This commit is contained in:
Joeri Exelmans 2025-03-20 19:59:24 +01:00
parent c5ac55b0ff
commit 33c156fc5c
5 changed files with 148 additions and 9 deletions
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18
generics/generics.test.js
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@ -1,20 +1,21 @@
import { Bool, Int } from "../primitives/symbols.js";
import { lsType } from "../structures/list_common.js";
import { fnType } from "../metacircular.js";
import { assign, makeGeneric, unify } from "./generics.js";
import { assign, makeGeneric, mergeSubstitutions, unify } from "./generics.js";
import { select } from "@inquirer/prompts";
// a -> Int
const a_to_Int = makeGeneric(a => fnType({in: a, out: Int}));
// Bool -> Int
const Bool_to_Int = makeGeneric(() => fnType({in: lsType(Bool), out: Int}));
// should be: Bool -> Int
console.log("should be: Bool -> Int")
console.log(unify(a_to_Int, Bool_to_Int));
// (a -> a) -> b
const fnType2 = makeGeneric((a,b) => fnType({in: fnType({in: a, out: a}), out: b}));
// (Bool -> Bool) -> a
const fnType3 = makeGeneric(a => fnType({in: fnType({in: Bool, out: Bool}), out: a}));
// should be: (Bool -> Bool) -> a
console.log("should be: (Bool -> Bool) -> a");
console.log(unify(fnType2, fnType3));
// (a -> b) -> [a] -> [b]
@ -26,5 +27,14 @@ const mapFnType = makeGeneric((a,b) =>
// a -> a
const idFnType = makeGeneric(a =>
fnType({in: a, out: a}));
// should be: [a] -> [a]
console.log("should be: [a] -> [a]");
console.log(assign(mapFnType, idFnType));
// (a -> Int) -> [a] -> a
const weirdFnType = makeGeneric(a =>
fnType({
in: fnType({in: a, out: Int}),
out: fnType({in: lsType(a), out: a}),
}));
console.log("should be: [Int] -> Int");
console.log(assign(weirdFnType, idFnType));