76 lines
2.1 KiB
JavaScript
76 lines
2.1 KiB
JavaScript
// re-inventing the wheel:
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export function deepEqual(a, b) {
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if (a === b) return true; // <- shallow equality and primitives
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if (typeof a !== 'object' || typeof b !== 'object' || a === null || b === null) {
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return false;
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}
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if (Array.isArray(a) && Array.isArray(b)) {
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if (a.length !== b.length) return false;
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for (let i = 0; i < a.length; i++) {
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if (!deepEqual(a[i], b[i])) return false;
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}
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return true;
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}
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const keysA = Object.keys(a);
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const keysB = Object.keys(b);
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if (keysA.length !== keysB.length) return false;
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for (let key of keysA) {
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if (!keysB.includes(key) || !deepEqual(a[key], b[key])) {
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return false;
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}
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}
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return true;
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}
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// zip two arrays
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export function zip(a, b) {
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return a.map((k, i) => [k, b[i]]);
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}
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export class DefaultMap {
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constructor(defaultValue, ...rest) {
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this.defaultValue = defaultValue;
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this.m = new Map(rest);
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}
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getdefault(key, addToMapping=false) {
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return this.m.get(key) || (() => {
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const val = this.defaultValue(key);
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if (addToMapping)
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this.m.set(key, val);
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return val;
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})();
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}
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entries() {
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return this.m.entries();
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}
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}
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import { inspect } from 'node:util';
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import { symbolFunction, symbolList, symbolProduct, symbolSum } from './structures/types.js';
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export function pretty(obj) {
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return inspect(obj, {colors: true, depth: null});
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}
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export function prettyT(type) {
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if (type.typeVars) {
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return `∀${[...type.typeVars].map(prettyT).join(", ")}: ${prettyT(type.type)}`;
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}
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if (type.symbol === symbolFunction) {
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return `${prettyT(type.params[0])} -> ${prettyT(type.params[1])}`;
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}
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if (type.symbol === symbolList) {
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return `[${prettyT(type.params[0])}]`;
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}
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if (type.symbol === symbolProduct) {
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return `(${prettyT(type.params[0])}, ${prettyT(type.params[1])})`;
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}
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if (type.symbol === symbolSum) {
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return `(${prettyT(type.params[0])} | ${prettyT(type.params[1])})`;
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}
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if (type.params.length === 0) {
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return type.symbol.description;
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}
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return `${type.symbol.description}(${type.params.map(prettyT).join(", ")})`;
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}
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