103 lines
2.8 KiB
TypeScript
103 lines
2.8 KiB
TypeScript
import { Tag } from "./constants";
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import { stringify } from "./text";
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import { Value } from "./values";
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import type { GenericEmbedded } from "./embedded";
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import type { Encoder, Preservable } from "./encoder";
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import type { Writer, PreserveWritable } from "./writer";
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import * as IO from "./iolist";
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export type FloatType = 'Single' | 'Double';
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export const FloatType = Symbol.for('FloatType');
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export abstract class Float {
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readonly value: number;
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constructor(value: number | Float) {
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this.value = typeof value === 'number' ? value : value.value;
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}
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toString() {
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return stringify(this);
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}
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equals(other: any): boolean {
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return Object.is(other.constructor, this.constructor) && (other.value === this.value);
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}
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hashCode(): number {
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return (this.value | 0); // TODO: something better?
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}
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abstract get [FloatType](): FloatType;
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static isFloat = (x: any): x is Float => x?.[FloatType] !== void 0;
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static isSingle = (x: any): x is SingleFloat => x?.[FloatType] === 'Single';
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static isDouble = (x: any): x is DoubleFloat => x?.[FloatType] === 'Double';
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}
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export function floatValue(f: any): number {
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if (typeof f === 'number') {
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return f;
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} else if (Float.isFloat(f)) {
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return f.value;
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} else {
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return NaN;
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}
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}
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export class SingleFloat extends Float implements Preservable<any>, PreserveWritable<any> {
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__as_preserve__<T = GenericEmbedded>(): Value<T> {
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return this;
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}
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static __from_preserve__<T>(v: Value<T>): undefined | SingleFloat {
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return Float.isSingle(v) ? v : void 0;
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}
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__preserve_on__<T>(_encoder: Encoder<T>): IO.IOList {
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const bs = new Uint8Array(4);
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new DataView(bs.buffer).setFloat32(0, this.value, false);
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return [Tag.Float, bs];
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}
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__preserve_text_on__(w: Writer<any>) {
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w.state.pieces.push('' + this.value + 'f');
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}
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get [FloatType](): 'Single' {
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return 'Single';
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}
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}
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export function Single(value: number | Float): SingleFloat {
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return new SingleFloat(value);
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}
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export class DoubleFloat extends Float implements Preservable<any>, PreserveWritable<any> {
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__as_preserve__<T = GenericEmbedded>(): Value<T> {
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return this;
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}
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static __from_preserve__<T>(v: Value<T>): undefined | DoubleFloat {
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return Float.isDouble(v) ? v : void 0;
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}
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__preserve_on__<T>(_encoder: Encoder<T>): IO.IOList {
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const bs = new Uint8Array(8);
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new DataView(bs.buffer).setFloat64(0, this.value, false);
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return [Tag.Float, bs];
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}
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__preserve_text_on__(w: Writer<any>) {
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w.state.pieces.push('' + this.value);
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}
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get [FloatType](): 'Double' {
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return 'Double';
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}
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}
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export function Double(value: number | Float): DoubleFloat {
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return new DoubleFloat(value);
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}
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