node_modules/diff/lib/util/distance-iterator.js

/*istanbul ignore start*/"use strict";

exports.__esModule = true;

exports["default"] = /*istanbul ignore end*/function (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
  };
};
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