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can auto-generate comparison functions for composed types

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This commit is contained in:
Joeri Exelmans 2025-04-17 16:43:28 +02:00
parent 0b262daf7f
commit 4d1fb81492
6 changed files with 72 additions and 35 deletions
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10
structures/types.js
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@ -8,7 +8,7 @@ import { getSymbol, makeTypeConstructor } from "../type_constructor.js";
// The registry ensures that we never accidentally create more than one JS object for the same function type.
// It is a cheap workaround for JS lacking customizable hash-functions and equality-testing-functions.
// This same pattern is repeated throughout the code for all non-nullary type constructors (list, sum, product, ...)
const symbolFunction = Symbol('Function');
export const symbolFunction = Symbol('Function');
export const fnType = makeTypeConstructor(symbolFunction)(2);
export const isFunction = type => getSymbol(type) === symbolFunction;
@ -35,22 +35,22 @@ export const typedFnType = (instance, callback, typeOfType = Type) => {
// Sum type
const symbolSum = Symbol("Sum");
export const symbolSum = Symbol("Sum");
export const sumType = makeTypeConstructor(symbolSum)(2);
// Product type
const symbolProduct = Symbol("Product");
export const symbolProduct = Symbol("Product");
export const prodType = makeTypeConstructor(symbolProduct)(2);
// List type
const symbolList = Symbol('List');
export const symbolList = Symbol('List');
export const lsType = makeTypeConstructor(symbolList)(1);
// Set type
const symbolSet = Symbol('Set');
export const symbolSet = Symbol('Set');
export const setType = makeTypeConstructor(symbolSet)(1);