ueblueprint/js/entity/BooleanEntity.js

import P from "parsernostrum"
import IEntity from "./IEntity.js"

export default class BooleanEntity extends IEntity {

    static grammar = this.createGrammar()
    static booleanConverter = {
        fromAttribute: (value, type) => {
            value ? "true" : "false"
        },
        toAttribute: (value, type) => {
            if (value === true) {
                return "true"
            }
            if (value === false) {
                return "false"
            }
            return ""
        }
    }

    #uppercase = true
    get uppercase() {
        return this.#uppercase
    }
    set uppercase(value) {
        this.#uppercase = value
    }

    /** @returns {P<BooleanEntity>} */
    static createGrammar() {
        return P.regArray(/(true)|(True)|(false)|(False)/)
            .map(v => {
                const result = (v[1] ?? v[2]) ? new this(true) : new this(false)
                result.uppercase = (v[2] ?? v[4]) !== undefined
                return result
            })
            .label("BooleanEntity")
    }

    constructor(value = false) {
        super()
        this.value = value
    }

    serialize(
        insideString = false,
        indentation = "",
        Self = /** @type {typeof IEntity} */(this.constructor),
    ) {
        let result = this.value
            ? this.#uppercase ? "True" : "true"
            : this.#uppercase ? "False" : "false"
        if (Self.serialized) {
            result = `"${result}"`
        }
        return result
    }

    valueOf() {
        return this.value
    }
}