Function getLineAnchorForOffset

lib/utils/getLineAnchorForOffset.js:28–46

* Return an anchor of a cursor in a block as a {line,offset} object * * @param {String} text * @param {Number} offset * @param {String} sep (optional) * @return {LineAnchor}

(text, offset, sep)

 * @return {LineAnchor}
 */
function getLineAnchorForOffset(text, offset, sep) {
  sep = sep || getNewLine(text);

  var lineIndex = 0;
  var nextLineIndex = 0;
  var lastLineIndex = 0;

  while (nextLineIndex >= 0 && nextLineIndex < offset) {
    lineIndex++;

    lastLineIndex = nextLineIndex;
    nextLineIndex = text.indexOf(sep, nextLineIndex + sep.length);
  }

  return new LineAnchor({
    line: lineIndex - 1,
    offset: offset - lastLineIndex
  });
}

module.exports = getLineAnchorForOffset;