61 lines
1.7 KiB
TypeScript
61 lines
1.7 KiB
TypeScript
import { Encoder } from "./encoder";
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import { Tag } from "./constants";
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import { AsPreserve, PreserveOn } from "./symbols";
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import { DefaultPointer, Value } from "./values";
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import { is, isAnnotated, IsPreservesAnnotated } from './is';
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export class Annotated<T extends object = DefaultPointer> {
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readonly annotations: Array<Value<T>>;
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readonly item: Value<T>;
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constructor(item: Value<T>) {
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this.annotations = [];
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this.item = item;
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}
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[AsPreserve](): Value<T> {
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return this;
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}
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[PreserveOn](encoder: Encoder<T>) {
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if (encoder.includeAnnotations) {
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for (const a of this.annotations) {
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encoder.emitbyte(Tag.Annotation);
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encoder.push(a);
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}
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}
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encoder.push(this.item);
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}
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equals(other: any): boolean {
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return is(this.item, Annotated.isAnnotated(other) ? other.item : other);
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}
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// hashCode(): number {
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// return hash(this.item);
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// }
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toString(): string {
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return this.asPreservesText();
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}
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asPreservesText(): string {
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const anns = this.annotations.map((a) => '@' + a.asPreservesText()).join(' ');
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return (anns ? anns + ' ' : anns) + this.item.asPreservesText();
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}
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get [IsPreservesAnnotated](): boolean {
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return true;
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}
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static isAnnotated<T extends object = DefaultPointer>(x: any): x is Annotated<T> {
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return isAnnotated(x);
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}
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}
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export function annotate<T extends object = DefaultPointer>(v0: Value<T>, ...anns: Value<T>[]): Annotated<T> {
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const v = Annotated.isAnnotated<T>(v0) ? v0 : new Annotated(v0);
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anns.forEach((a) => v.annotations.push(a));
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return v;
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}
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