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HBool.ts
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HBool.ts
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/*
* Copyright (c) 2020, J2 Innovations. All Rights Reserved
*/
import { Kind } from './Kind'
import {
HVal,
CANNOT_CHANGE_READONLY_VALUE,
valueInspect,
valueIsKind,
valueMatches,
} from './HVal'
import { Node } from '../filter/Node'
import { HGrid } from './HGrid'
import { HList } from './HList'
import { HDict } from './HDict'
import { EvalContext } from '../filter/EvalContext'
let trueInstance: HBool
let falseInstance: HBool
/**
* Haystack boolean.
*/
export class HBool implements HVal {
/**
* The boolean value.
*/
readonly #value: boolean
/**
* Constructs a new haystack boolean.
*
* @param value The value.
*/
private constructor(value: boolean) {
this.#value = !!value
}
/**
* Factory method for a haystack boolean.
*
* @param value The value.
* @returns A haystack boolean value.
*/
public static make(value: boolean | HBool): HBool {
if (typeof value === 'boolean') {
if (value) {
return (
trueInstance ??
Object.freeze((trueInstance = new HBool(true)))
)
} else {
return (
falseInstance ??
Object.freeze((falseInstance = new HBool(false)))
)
}
} else {
return value
}
}
/**
* @returns The boolean value.
*/
public get value(): boolean {
return this.#value
}
public set value(value: boolean) {
throw new Error(CANNOT_CHANGE_READONLY_VALUE)
}
/**
* @returns The value's kind.
*/
public getKind(): Kind {
return Kind.Bool
}
/**
* Compares the value's kind.
*
* @param kind The kind to compare against.
* @returns True if the kind matches.
*/
public isKind(kind: Kind): boolean {
return valueIsKind<HBool>(this, kind)
}
/* Returns true if the haystack filter matches the value.
*
* @param filter The filter to test.
* @param cx Optional haystack filter evaluation context.
* @returns True if the filter matches ok.
*/
public matches(filter: string | Node, cx?: Partial<EvalContext>): boolean {
return valueMatches(this, filter, cx)
}
/**
*
* @param message An optional message to display before the value.
* @returns The value instance.
*/
public inspect(message?: string): this {
return valueInspect(this, message)
}
/*
* @returns The object's value as a boolean string.
*/
public valueOf(): boolean {
return this.#value
}
/**
* Value equality check.
*
* @param value The value to compare.
* @returns True if the value is the same.
*/
public equals(value: unknown): boolean {
return (
valueIsKind<HBool>(value, Kind.Bool) &&
this.valueOf() === value.valueOf()
)
}
/**
* Compares two booleans.
*
* @param value The value to compare against.
* @returns The sort order as negative, 0, or positive
*/
public compareTo(value: unknown): number {
if (!valueIsKind<HBool>(value, Kind.Bool)) {
return -1
}
if (this.valueOf() < value.valueOf()) {
return -1
}
if (this.valueOf() === value.valueOf()) {
return 0
}
return 1
}
/**
* @returns A string representation of the value.
*/
public toString(): string {
return String(this.value)
}
/**
* Encodes to an encoded zinc value that can be used
* in a haystack filter string.
*
* The encoding for a haystack filter is mostly zinc but contains
* some exceptions.
*
* @returns The encoded value that can be used in a haystack filter.
*/
public toFilter(): string {
return this.valueOf() ? 'true' : 'false'
}
/**
* Encode to zinc encoding.
*
* @returns The encoded zinc string.
*/
public toZinc(): string {
return this.valueOf() ? 'T' : 'F'
}
/**
* @returns A JSON reprentation of the object.
*/
public toJSON(): boolean {
return this.valueOf()
}
/**
* @returns A JSON v3 representation of the object.
*/
public toJSONv3(): boolean {
return this.toJSON()
}
/**
* @returns An Axon encoded string of the value.
*/
public toAxon(): string {
return String(this.valueOf())
}
/**
* @returns Returns the value instance.
*/
public newCopy(): HBool {
return this
}
/**
* @returns The value as a grid.
*/
public toGrid(): HGrid {
return HGrid.make(this)
}
/**
* @returns The value as a list.
*/
public toList(): HList<HBool> {
return HList.make(this)
}
/**
* @returns The value as a dict.
*/
public toDict(): HDict {
return HDict.make(this)
}
}