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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.createPatch = createPatch;
exports.createTwoFilesPatch = createTwoFilesPatch;
exports.formatPatch = formatPatch;
exports.structuredPatch = structuredPatch;
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var
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_line = require("../diff/line")
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;
/*istanbul ignore start*/ function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
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" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) 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; }
function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
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function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
  if (!options) {
    options = {};
  }
  if (typeof options === 'function') {
    options = {
      callback: options
    };
  }
  if (typeof options.context === 'undefined') {
    options.context = 4;
  }
  if (options.newlineIsToken) {
    throw new Error('newlineIsToken may not be used with patch-generation functions, only with diffing functions');
  }
  if (!options.callback) {
    return diffLinesResultToPatch(
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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));
  } else {
    var
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      _options =
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      options,
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      /*istanbul ignore end*/
      _callback = _options.callback;
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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,
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    _objectSpread(_objectSpread({},
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    options), {}, {
      callback: function
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      callback
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      (diff) {
        var patch = diffLinesResultToPatch(diff);
        _callback(patch);
      }
    }));
  }
  function diffLinesResultToPatch(diff) {
    // STEP 1: Build up the patch with no "\ No newline at end of file" lines and with the arrays
    //         of lines containing trailing newline characters. We'll tidy up later...

    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;
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    var _loop = function _loop()
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    {
      var current = diff[i],
        lines = current.lines || splitLines(current.value);
      current.lines = lines;
      if (current.added || current.removed) {
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        var _curRange;
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        // 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
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        /*istanbul ignore end*/
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        (_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) {
            /*istanbul ignore start*/
            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 {
            /*istanbul ignore start*/
            var _curRange3;
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            // 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
            };
            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();
    }

    // Step 2: eliminate the trailing `\n` from each line of each hunk, and, where needed, add
    //         "\ No newline at end of file".
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    for (
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    var _i = 0, _hunks =
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      hunks;
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    _i < _hunks.length
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    ;
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    _i++
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    ) {
      var hunk =
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      _hunks[_i]
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      ;
      for (var _i2 = 0; _i2 < hunk.lines.length; _i2++) {
        if (hunk.lines[_i2].endsWith('\n')) {
          hunk.lines[_i2] = hunk.lines[_i2].slice(0, -1);
        } else {
          hunk.lines.splice(_i2 + 1, 0, '\\ No newline at end of file');
          _i2++; // Skip the line we just added, then continue iterating
        }
      }
    }
    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) {
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  var _options2;
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  if (typeof options === 'function') {
    options = {
      callback: options
    };
  }
  if (!
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  ((_options2 =
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  options) !== null && _options2 !== void 0 &&
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  _options2
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  .callback)) {
    var patchObj = structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options);
    if (!patchObj) {
      return;
    }
    return formatPatch(patchObj);
  } else {
    var
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      _options3 =
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      options,
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      _callback2 = _options3.callback;
    structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader,
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    _objectSpread(_objectSpread({},
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    options), {}, {
      callback: function
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      callback
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      (patchObj) {
        if (!patchObj) {
          _callback2();
        } else {
          _callback2(formatPatch(patchObj));
        }
      }
    }));
  }
}
function createPatch(fileName, oldStr, newStr, oldHeader, newHeader, options) {
  return createTwoFilesPatch(fileName, fileName, oldStr, newStr, oldHeader, newHeader, options);
}

/**
 * Split `text` into an array of lines, including the trailing newline character (where present)
 */
function splitLines(text) {
  var hasTrailingNl = text.endsWith('\n');
  var result = text.split('\n').map(function (line)
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  {
    return (
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      line + '\n'
    );
  });
  if (hasTrailingNl) {
    result.pop();
  } else {
    result.push(result.pop().slice(0, -1));
  }
  return result;
}
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