86 lines
No EOL
2.8 KiB
TypeScript
86 lines
No EOL
2.8 KiB
TypeScript
import {Translation} from "../../UI/i18n/Translation";
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import UnitConfigJson from "./UnitConfigJson";
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import Translations from "../../UI/i18n/Translations";
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export class Unit {
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public readonly human: Translation;
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private readonly alternativeDenominations: string [];
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private readonly canonical: string;
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private readonly default: boolean;
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private readonly prefix: boolean;
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constructor(json: UnitConfigJson, context: string) {
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context = `${context}.unit(${json.canonicalDenomination})`
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this.canonical = json.canonicalDenomination.trim()
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if ((this.canonical ?? "") === "") {
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throw `${context}: this unit has no decent canonical value defined`
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}
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json.alternativeDenomination.forEach((v, i) => {
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if (((v?.trim() ?? "") === "")) {
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throw `${context}.alternativeDenomination.${i}: invalid alternative denomination: undefined, null or only whitespace`
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}
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})
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this.alternativeDenominations = json.alternativeDenomination?.map(v => v.trim()) ?? []
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this.default = json.default ?? false;
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this.human = Translations.T(json.human, context + "human")
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this.prefix = json.prefix ?? false;
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}
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public canonicalValue(value: string) {
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const stripped = this.StrippedValue(value)
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if(stripped === null){
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return null;
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}
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return stripped + this.canonical
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}
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/**
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* Returns the core value (without unit) if:
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* - the value ends with the canonical or an alternative value (or begins with if prefix is set)
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* - the value is a Number (without unit) and default is set
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*
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* Returns null if it doesn't match this unit
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* @param value
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* @constructor
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*/
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private StrippedValue(value: string): string {
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if (this.prefix) {
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if (value.startsWith(this.canonical)) {
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return value.substring(this.canonical.length).trim();
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}
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for (const alternativeValue of this.alternativeDenominations) {
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if (value.startsWith(alternativeValue)) {
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return value.substring(alternativeValue.length).trim();
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}
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}
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} else {
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if (value.endsWith(this.canonical)) {
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return value.substring(0, value.length - this.canonical.length).trim();
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}
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for (const alternativeValue of this.alternativeDenominations) {
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if (value.endsWith(alternativeValue)) {
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return value.substring(0, value.length - alternativeValue.length).trim();
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}
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}
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}
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if (this.default) {
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const parsed = Number(value.trim())
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if (!isNaN(parsed)) {
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return value.trim();
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}
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}
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return null;
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}
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} |