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add type comparison function

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This commit is contained in:
Joeri Exelmans 2025-04-20 11:24:05 +02:00
parent 3be17c1148
commit c1ac3c0d60
1 changed files with 12 additions and 0 deletions
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12
compare/primitives.js
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@ -1,5 +1,7 @@
// Total ordering of primitive types // Total ordering of primitive types
import { getSymbol } from "../type_constructor.js";
export const compareNumbers = x => y => { export const compareNumbers = x => y => {
if (typeof(x) !== 'number' || typeof(y) !== 'number') { if (typeof(x) !== 'number' || typeof(y) !== 'number') {
throw new Error(`was only meant to compare numbers! got ${x} and ${y}`); throw new Error(`was only meant to compare numbers! got ${x} and ${y}`);
@ -23,3 +25,13 @@ export const compareBools = x => y => {
// The Unit-type has only one instance, which is equal to itself: // The Unit-type has only one instance, which is equal to itself:
export const compareUnits = x => y => 0; export const compareUnits = x => y => 0;
export const compareTypes = x => y => {
return compareSymbols(getSymbol(x))(getSymbol(y))
|| compareNumbers(x.params.length)(y.params.length)
|| x.params.reduce((acc, _, i) => acc || compareTypes(x.params[i])(y.params[i]), 0)
}
// Note: dirty assumption that every symbol has unique description.
// This will be fixed once we move from symbols to real UUIDs.
export const compareSymbols = a => b => (a !== b) && compareStrings(a.description)(b.description);