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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.structuredPatch = structuredPatch;
exports.formatPatch = formatPatch;
exports.createTwoFilesPatch = createTwoFilesPatch;
exports.createPatch = createPatch;

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var
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_line = require("../diff/line")
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;

/*istanbul ignore start*/ function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }

function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter); }

function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

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function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
  if (!options) {
    options = {};
  }

  if (typeof options.context === 'undefined') {
    options.context = 4;
  }

  var diff =
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  (0,
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  _line
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  .
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  diffLines)
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  (oldStr, newStr, options);

  if (!diff) {
    return;
  }

  diff.push({
    value: '',
    lines: []
  }); // Append an empty value to make cleanup easier

  function contextLines(lines) {
    return lines.map(function (entry) {
      return ' ' + entry;
    });
  }

  var hunks = [];
  var oldRangeStart = 0,
      newRangeStart = 0,
      curRange = [],
      oldLine = 1,
      newLine = 1;

  /*istanbul ignore start*/
  var _loop = function _loop(
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  i) {
    var current = diff[i],
        lines = current.lines || current.value.replace(/\n$/, '').split('\n');
    current.lines = lines;

    if (current.added || current.removed) {
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      var _curRange;

      /*istanbul ignore end*/
      // If we have previous context, start with that
      if (!oldRangeStart) {
        var prev = diff[i - 1];
        oldRangeStart = oldLine;
        newRangeStart = newLine;

        if (prev) {
          curRange = options.context > 0 ? contextLines(prev.lines.slice(-options.context)) : [];
          oldRangeStart -= curRange.length;
          newRangeStart -= curRange.length;
        }
      } // Output our changes


      /*istanbul ignore start*/

      /*istanbul ignore end*/

      /*istanbul ignore start*/
      (_curRange =
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      curRange).push.apply(
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      _curRange
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      ,
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      _toConsumableArray(
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      lines.map(function (entry) {
        return (current.added ? '+' : '-') + entry;
      }))); // Track the updated file position


      if (current.added) {
        newLine += lines.length;
      } else {
        oldLine += lines.length;
      }
    } else {
      // Identical context lines. Track line changes
      if (oldRangeStart) {
        // Close out any changes that have been output (or join overlapping)
        if (lines.length <= options.context * 2 && i < diff.length - 2) {
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          var _curRange2;

          /*istanbul ignore end*/
          // Overlapping

          /*istanbul ignore start*/

          /*istanbul ignore end*/

          /*istanbul ignore start*/
          (_curRange2 =
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          curRange).push.apply(
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          _curRange2
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          ,
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          _toConsumableArray(
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          contextLines(lines)));
        } else {
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          var _curRange3;

          /*istanbul ignore end*/
          // end the range and output
          var contextSize = Math.min(lines.length, options.context);

          /*istanbul ignore start*/

          /*istanbul ignore end*/

          /*istanbul ignore start*/
          (_curRange3 =
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          curRange).push.apply(
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          _curRange3
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          ,
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          _toConsumableArray(
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          contextLines(lines.slice(0, contextSize))));

          var hunk = {
            oldStart: oldRangeStart,
            oldLines: oldLine - oldRangeStart + contextSize,
            newStart: newRangeStart,
            newLines: newLine - newRangeStart + contextSize,
            lines: curRange
          };

          if (i >= diff.length - 2 && lines.length <= options.context) {
            // EOF is inside this hunk
            var oldEOFNewline = /\n$/.test(oldStr);
            var newEOFNewline = /\n$/.test(newStr);
            var noNlBeforeAdds = lines.length == 0 && curRange.length > hunk.oldLines;

            if (!oldEOFNewline && noNlBeforeAdds && oldStr.length > 0) {
              // special case: old has no eol and no trailing context; no-nl can end up before adds
              // however, if the old file is empty, do not output the no-nl line
              curRange.splice(hunk.oldLines, 0, '\\ No newline at end of file');
            }

            if (!oldEOFNewline && !noNlBeforeAdds || !newEOFNewline) {
              curRange.push('\\ No newline at end of file');
            }
          }

          hunks.push(hunk);
          oldRangeStart = 0;
          newRangeStart = 0;
          curRange = [];
        }
      }

      oldLine += lines.length;
      newLine += lines.length;
    }
  };

  for (var i = 0; i < diff.length; i++) {
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    _loop(
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    i);
  }

  return {
    oldFileName: oldFileName,
    newFileName: newFileName,
    oldHeader: oldHeader,
    newHeader: newHeader,
    hunks: hunks
  };
}

function formatPatch(diff) {
  if (Array.isArray(diff)) {
    return diff.map(formatPatch).join('\n');
  }

  var ret = [];

  if (diff.oldFileName == diff.newFileName) {
    ret.push('Index: ' + diff.oldFileName);
  }

  ret.push('===================================================================');
  ret.push('--- ' + diff.oldFileName + (typeof diff.oldHeader === 'undefined' ? '' : '\t' + diff.oldHeader));
  ret.push('+++ ' + diff.newFileName + (typeof diff.newHeader === 'undefined' ? '' : '\t' + diff.newHeader));

  for (var i = 0; i < diff.hunks.length; i++) {
    var hunk = diff.hunks[i]; // Unified Diff Format quirk: If the chunk size is 0,
    // the first number is one lower than one would expect.
    // https://www.artima.com/weblogs/viewpost.jsp?thread=164293

    if (hunk.oldLines === 0) {
      hunk.oldStart -= 1;
    }

    if (hunk.newLines === 0) {
      hunk.newStart -= 1;
    }

    ret.push('@@ -' + hunk.oldStart + ',' + hunk.oldLines + ' +' + hunk.newStart + ',' + hunk.newLines + ' @@');
    ret.push.apply(ret, hunk.lines);
  }

  return ret.join('\n') + '\n';
}

function createTwoFilesPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
  return formatPatch(structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options));
}

function createPatch(fileName, oldStr, newStr, oldHeader, newHeader, options) {
  return createTwoFilesPatch(fileName, fileName, oldStr, newStr, oldHeader, newHeader, options);
}
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