@uiw/react-md-editor/esm/utils/markdownUtils.js

A markdown editor with preview, implemented with React.js and TypeScript.

export function selectWord(_ref) {
  var {
    text,
    selection
  } = _ref;

  if (text && text.length && selection.start === selection.end) {
    // the user is pointing to a word
    return getSurroundingWord(text, selection.start);
  }

  return selection;
}
/**
 *  Gets the number of line-breaks that would have to be inserted before the given 'startPosition'
 *  to make sure there's an empty line between 'startPosition' and the previous text
 */

export function getBreaksNeededForEmptyLineBefore(text, startPosition) {
  if (text === void 0) {
    text = '';
  }

  if (startPosition === 0) return 0; // rules:
  // - If we're in the first line, no breaks are needed
  // - Otherwise there must be 2 breaks before the previous character. Depending on how many breaks exist already, we
  //      may need to insert 0, 1 or 2 breaks

  var neededBreaks = 2;
  var isInFirstLine = true;

  for (var i = startPosition - 1; i >= 0 && neededBreaks >= 0; i--) {
    switch (text.charCodeAt(i)) {
      case 32:
        // blank space
        continue;

      case 10:
        // line break
        neededBreaks--;
        isInFirstLine = false;
        break;

      default:
        return neededBreaks;
    }
  }

  return isInFirstLine ? 0 : neededBreaks;
}
/**
 *  Gets the number of line-breaks that would have to be inserted after the given 'startPosition'
 *  to make sure there's an empty line between 'startPosition' and the next text
 */

export function getBreaksNeededForEmptyLineAfter(text, startPosition) {
  if (text === void 0) {
    text = '';
  }

  if (startPosition === text.length - 1) return 0; // rules:
  // - If we're in the first line, no breaks are needed
  // - Otherwise there must be 2 breaks before the previous character. Depending on how many breaks exist already, we
  //      may need to insert 0, 1 or 2 breaks

  var neededBreaks = 2;
  var isInLastLine = true;

  for (var i = startPosition; i < text.length && neededBreaks >= 0; i++) {
    switch (text.charCodeAt(i)) {
      case 32:
        continue;

      case 10:
        {
          neededBreaks--;
          isInLastLine = false;
          break;
        }

      default:
        return neededBreaks;
    }
  }

  return isInLastLine ? 0 : neededBreaks;
}
export function getSurroundingWord(text, position) {
  if (!text) throw Error("Argument 'text' should be truthy");

  var isWordDelimiter = c => c === ' ' || c.charCodeAt(0) === 10; // leftIndex is initialized to 0 because if selection is 0, it won't even enter the iteration


  var start = 0; // rightIndex is initialized to text.length because if selection is equal to text.length it won't even enter the interation

  var end = text.length; // iterate to the left

  for (var i = position; i - 1 > -1; i--) {
    if (isWordDelimiter(text[i - 1])) {
      start = i;
      break;
    }
  } // iterate to the right


  for (var _i = position; _i < text.length; _i++) {
    if (isWordDelimiter(text[_i])) {
      end = _i;
      break;
    }
  }

  return {
    start,
    end
  };
}
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