input-format/modules/edit.js

Formatting user's text input on-the-fly

// Edits text `value` (if `operation` is passed) and repositions the `caret` if needed.
//
// Example:
//
// value - '88005553535'
// caret - 2 // starting from 0; is positioned before the first zero
// operation - 'Backspace'
//
// Returns
// {
// 	value: '8005553535'
// 	caret: 1
// }
//
// Currently supports just 'Delete' and 'Backspace' operations
//
export default function edit(value, caret, operation) {
  switch (operation) {
    case 'Backspace':
      // If there exists the previous character,
      // then erase it and reposition the caret.
      if (caret > 0) {
        // Remove the previous character
        value = value.slice(0, caret - 1) + value.slice(caret); // Position the caret where the previous (erased) character was

        caret--;
      }

      break;

    case 'Delete':
      // Remove current digit (if any)
      value = value.slice(0, caret) + value.slice(caret + 1);
      break;
  }

  return {
    value: value,
    caret: caret
  };
}
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