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Filename : format.js
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import template_formatter from './templateFormatter.js'; // Formats `value` value preserving `caret` at the same character.
//
// `{ value, caret }` attribute is the result of `parse()` function call.
//
// Returns `{ text, caret }` where the new `caret` is the caret position
// inside `text` text corresponding to the original `caret` position inside `value`.
//
// `formatter(value)` is a function returning `{ text, template }`.
//
// `text` is the `value` value formatted using `template`.
// It may either cut off the non-filled right part of the `template`
// or it may fill the non-filled character placeholders
// in the right part of the `template` with `spacer`
// which is a space (' ') character by default.
//
// `template` is the template used to format the `value`.
// It can be either a full-length template or a partial template.
//
// `formatter` can also be a string — a `template`
// where character placeholders are denoted by 'x'es.
// In this case `formatter` function is automatically created.
//
// Example:
//
// `value` is '880',
// `caret` is `2` (before the first `0`)
//
// `formatter` is `'880' =>
//   { text: '8 (80 )', template: 'x (xxx) xxx-xx-xx' }`
//
// The result is `{ text: '8 (80 )', caret: 4 }`.
//

export default function format(value, caret, formatter) {
  if (typeof formatter === 'string') {
    formatter = template_formatter(formatter);
  }

  var _ref = formatter(value) || {},
      text = _ref.text,
      template = _ref.template;

  if (text === undefined) {
    text = value;
  }

  if (template) {
    if (caret === undefined) {
      caret = text.length;
    } else {
      var index = 0;
      var found = false;
      var possibly_last_input_character_index = -1;

      while (index < text.length && index < template.length) {
        // Character placeholder found
        if (text[index] !== template[index]) {
          if (caret === 0) {
            found = true;
            caret = index;
            break;
          }

          possibly_last_input_character_index = index;
          caret--;
        }

        index++;
      } // If the caret was positioned after last input character,
      // then the text caret index is just after the last input character.


      if (!found) {
        caret = possibly_last_input_character_index + 1;
      }
    }
  }

  return {
    text: text,
    caret: caret
  };
}
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