51 lines
1.2 KiB
TypeScript
51 lines
1.2 KiB
TypeScript
import { Value } from './values';
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export function stringify(x: any): string {
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if (typeof x?.asPreservesText === 'function') {
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return x.asPreservesText();
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} else {
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try {
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return JSON.stringify(x);
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} catch (_e) {
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return ('' + x).asPreservesText();
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}
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}
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}
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export function preserves(pieces: TemplateStringsArray, ...values: Value<any>[]): string {
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const result = [pieces[0]];
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values.forEach((v, i) => {
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result.push(stringify(v));
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result.push(pieces[i + 1]);
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});
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return result.join('');
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}
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declare global {
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interface Object { asPreservesText(): string; }
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}
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Object.defineProperty(Object.prototype, 'asPreservesText', {
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enumerable: false,
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writable: true,
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value: function(): string { return '#!' + JSON.stringify(this); }
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});
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Boolean.prototype.asPreservesText = function (): string {
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return this ? '#t' : '#f';
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};
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Number.prototype.asPreservesText = function (): string {
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return '' + this;
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};
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String.prototype.asPreservesText = function (): string {
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return JSON.stringify(this);
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};
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Symbol.prototype.asPreservesText = function (): string {
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// TODO: escaping
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return this.description ?? '||';
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};
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