input-format/modules/templateParser.js

Formatting user's text input on-the-fly

import { count_occurences } from './helpers.js'; // `placeholder` argument is optional. By default, it's "x".

export default function (template, placeholder, parse) {
  if (typeof placeholder === 'function') {
    parse = placeholder;
    placeholder = 'x';
  }

  var placeholdersCountInTemplate = count_occurences(placeholder, template);
  return function (character, value) {
    if (value.length < placeholdersCountInTemplate) {
      return parse(character, value);
    }
  };
}
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