51 lines
No EOL
1.6 KiB
JavaScript
51 lines
No EOL
1.6 KiB
JavaScript
import { DefaultMap } from "../util.js";
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const symbolFunction = Symbol('Function');
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// The registry ensures that we never accidentally create more than one JS object for the same function type.
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// It is a cheap workaround for JS lacking customizable hash-functions and equality-testing-functions.
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// This same pattern is repeated throughout the code for all non-nullary type constructors (list, sum, product, ...)
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const fnTypeRegistry = new DefaultMap(inType => new DefaultMap(outType => ({
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symbol: symbolFunction,
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params: [inType, outType],
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})));
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// type constructor for function types
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export const fnType = inType => outType => fnTypeRegistry.getdefault(inType, true).getdefault(outType, true);
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// Wrapper around function below.
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export const typedFnType = (instance, callback) => {
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const [t, typesOfFns] = typedFnType2(callback);
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const res = [
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{ i: instance, t },
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...typesOfFns,
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];
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return res;
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};
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// Create a function type, and also create Type-links for the function type (being typed by Function) and for all the nested function types. Saves a lot of code writing.
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export const typedFnType2 = callback => {
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const fnTs = [];
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const wrappedFnType = ({ in: inType, out: outType }) => {
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const fnT = fnType({ in: inType, out: outType });
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fnTs.push(fnT);
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return fnT;
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};
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const t = callback(wrappedFnType); // force evaluation
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return [
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t,
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fnTs.map(fnT => ({ i: fnT, t: Function })),
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];
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};
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export const ModuleFunction = {l:[
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// binary type constructor: Type -> Type -> Type
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...typedFnType(fnType, fnType => fnType
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/* in */ (Type)
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/* out */ (fnType
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/* in */ (Type)
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/* out */ (Type)
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)
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),
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]}; |