Function distanceIterator

src/diff.js:715–754

(start, minLine, maxLine)

  // by distance from a given start position. I.e. for [0, 4], with
  // start of 2, this will iterate 2, 3, 1, 4, 0.
  function distanceIterator (start, minLine, maxLine) {
    var wantForward = true,
        backwardExhausted = false,
        forwardExhausted = false,
        localOffset = 1;
    return function iterator() {
      if (wantForward && !forwardExhausted) {
        if (backwardExhausted) {
          localOffset++;
        } else {
          wantForward = false;
        } // Check if trying to fit beyond text length, and if not, check it fits
        // after offset location (or desired location on first iteration)


        if (start + localOffset <= maxLine) {
          return localOffset;
        }

        forwardExhausted = true;
      }

      if (!backwardExhausted) {
        if (!forwardExhausted) {
          wantForward = true;
        } // Check if trying to fit before text beginning, and if not, check it fits
        // before offset location


        if (minLine <= start - localOffset) {
          return -localOffset++;
        }

        backwardExhausted = true;
        return iterator();
      } // We tried to fit hunk before text beginning and beyond text length, then
      // hunk can't fit on the text. Return undefined

    };
  }

  function applyPatch(source, uniDiff) {
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};