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Add product and sum types

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This commit is contained in:
Joeri Exelmans 2025-03-17 17:54:42 +01:00
parent 6023efc295
commit 574651ccb7
18 changed files with 209 additions and 157 deletions
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17
structures/list_common.js
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@ -1,22 +1,7 @@
import { fnType } from "../function_registry.js";
import { fnType, getListType } from "../type_registry.js";
import {Type, Function} from "../metacircular.js";
import {Int} from "../primitives/symbols.js";
// Global store of list types:
const listTypes = new Map();
export function getListType(elementType) {
if (listTypes.has(elementType)) {
// only generate each list type once
// this would not be necessary if we could define our own equality and hash functions on objects in JavaScript.
return listTypes.get(elementType);
}
else {
const type = Symbol('ListOf:'+elementType.toString());
listTypes.set(elementType, type);
return type;
}
}
export const makeListModule = elementType => {
// List<elementType> type depends on elementType
// generating it another time, will give the same type (structurally equivalent):