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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import { Converter } from '../utils/util.types';
/**
* Representation of a parsing error.
*/
export interface ParseError {
/**
* Error message describing the error, must be presentable to the user.
*/
message: string;
}
export function isParseError(value: string | ParseError): value is ParseError {
return typeof value === 'object';
}
/**
* A formatter which is capable of converting between internal values and the user facing representation.
*/
export interface TextInputFormatter {
/**
* Parse user input and convert it to the internal representation of the value.
* @param input the user input to convert
* @returns the parsed value, i.e. the internal representation to use, or a ParseError if
* the input cannot be converted (e.g. if it's in an invalid format).
*/
parse: Converter<string, string | ParseError>;
/**
* Format a value for presentation to the user.
* @param value the internal representation of the value.
* @returns the formatted value
*/
format: Converter<string, string>;
}
/**
* Formatter for the text input which displays numeric values with a fixed number of decimals.
*
* Internal format is the representation of a `number` as string (i.e. result of `Number.toString()`), user
* representation is a number formatted according to a German locale.
*/
export class TextInputNumberFormatter implements TextInputFormatter {
private readonly numberFormat: Intl.NumberFormat;
private readonly parseFractionRegex: RegExp;
private readonly parseIntegerRegex: RegExp = /^-?\d+(\.\d{3})*$/;
/**
* Create a new number formatter.
* @param decimals the number of decimals to show
*/
constructor(private readonly decimals = 0) {
this.numberFormat = new Intl.NumberFormat('de-DE', {
style: 'decimal',
useGrouping: true,
minimumFractionDigits: 2,
maximumFractionDigits: 2,
});
this.parseFractionRegex = new RegExp(`^\\d{0,${decimals.toFixed(0)}}$`);
}
public parse(input: string): string | ParseError {
if (!input) {
return input;
}
const [integerPart, fractionPart] = input.split(',', 2) as [
string,
string | undefined,
];
if (!this.parseIntegerRegex.test(integerPart)) {
return { message: 'Eingabe ist keine gültige Zahl' };
}
const integer = integerPart
.replaceAll('.', '') // replace thousands-separators
.replace(/^0+/g, ''); // strip leading zeros
if (!this.parseFractionRegex.test(fractionPart ?? '')) {
return {
message: `Maximal ${this.decimals.toFixed(0)} Nachkommastellen erlaubt.`,
};
}
const fraction = fractionPart?.replace(/(?=(0+))\1$/g, ''); // strip trailing zeros
return (
(integer.length > 0 ? integer : '0') + (fraction ? '.' + fraction : '')
);
}
public format(value: string): string {
if (!value) {
return value;
}
const numeric = parseFloat(value);
if (!isNaN(numeric)) {
return this.numberFormat.format(numeric);
} else {
console.error(`provided value '${value}' is not a number`);
return '';
}
}
}
/**
* Formatter for the text input which displays an IBAN in a friendly format.
*/
export class TextInputIBANFormatter implements TextInputFormatter {
private readonly parseRegexp: RegExp = /^[A-Z]{2}\d{2}[A-Za-z0-9]{1,30}$/;
public parse(input: string): string | ParseError {
if (!input) {
return '';
}
const withoutWhitespace = input.replace(/\s/g, '');
// allow input with country code in lower case -> automatically convert to upper case
const normalized =
withoutWhitespace.substring(0, 2).toUpperCase() +
withoutWhitespace.substring(2);
if (!this.parseRegexp.test(normalized)) {
return { message: 'Keine gültige IBAN' };
} else {
return normalized;
}
}
public format(value: string): string {
return [...this.stringChunks(value, 4)].join(' ');
}
private *stringChunks(value: string, size: number) {
for (let start = 0; start < value.length; start += size) {
yield value.slice(start, start + size);
}
}
}
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