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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.applyPatch = applyPatch;
exports.applyPatches = applyPatches;

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var
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_parse = require("./parse")
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;

var
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_distanceIterator = _interopRequireDefault(require("../util/distance-iterator"))
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;

/*istanbul ignore start*/ function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

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

  if (typeof uniDiff === 'string') {
    uniDiff =
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    (0,
    /*istanbul ignore end*/

    /*istanbul ignore start*/
    _parse
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    .
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    parsePatch)
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    (uniDiff);
  }

  if (Array.isArray(uniDiff)) {
    if (uniDiff.length > 1) {
      throw new Error('applyPatch only works with a single input.');
    }

    uniDiff = uniDiff[0];
  } // Apply the diff to the input


  var lines = source.split(/\r\n|[\n\v\f\r\x85]/),
      delimiters = source.match(/\r\n|[\n\v\f\r\x85]/g) || [],
      hunks = uniDiff.hunks,
      compareLine = options.compareLine || function (lineNumber, line, operation, patchContent)
  /*istanbul ignore start*/
  {
    return (
      /*istanbul ignore end*/
      line === patchContent
    );
  },
      errorCount = 0,
      fuzzFactor = options.fuzzFactor || 0,
      minLine = 0,
      offset = 0,
      removeEOFNL,
      addEOFNL;
  /**
   * Checks if the hunk exactly fits on the provided location
   */


  function hunkFits(hunk, toPos) {
    for (var j = 0; j < hunk.lines.length; j++) {
      var line = hunk.lines[j],
          operation = line.length > 0 ? line[0] : ' ',
          content = line.length > 0 ? line.substr(1) : line;

      if (operation === ' ' || operation === '-') {
        // Context sanity check
        if (!compareLine(toPos + 1, lines[toPos], operation, content)) {
          errorCount++;

          if (errorCount > fuzzFactor) {
            return false;
          }
        }

        toPos++;
      }
    }

    return true;
  } // Search best fit offsets for each hunk based on the previous ones


  for (var i = 0; i < hunks.length; i++) {
    var hunk = hunks[i],
        maxLine = lines.length - hunk.oldLines,
        localOffset = 0,
        toPos = offset + hunk.oldStart - 1;
    var iterator =
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    (0,
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    /*istanbul ignore start*/
    _distanceIterator
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    [
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    "default"
    /*istanbul ignore end*/
    ])(toPos, minLine, maxLine);

    for (; localOffset !== undefined; localOffset = iterator()) {
      if (hunkFits(hunk, toPos + localOffset)) {
        hunk.offset = offset += localOffset;
        break;
      }
    }

    if (localOffset === undefined) {
      return false;
    } // Set lower text limit to end of the current hunk, so next ones don't try
    // to fit over already patched text


    minLine = hunk.offset + hunk.oldStart + hunk.oldLines;
  } // Apply patch hunks


  var diffOffset = 0;

  for (var _i = 0; _i < hunks.length; _i++) {
    var _hunk = hunks[_i],
        _toPos = _hunk.oldStart + _hunk.offset + diffOffset - 1;

    diffOffset += _hunk.newLines - _hunk.oldLines;

    for (var j = 0; j < _hunk.lines.length; j++) {
      var line = _hunk.lines[j],
          operation = line.length > 0 ? line[0] : ' ',
          content = line.length > 0 ? line.substr(1) : line,
          delimiter = _hunk.linedelimiters && _hunk.linedelimiters[j] || '\n';

      if (operation === ' ') {
        _toPos++;
      } else if (operation === '-') {
        lines.splice(_toPos, 1);
        delimiters.splice(_toPos, 1);
        /* istanbul ignore else */
      } else if (operation === '+') {
        lines.splice(_toPos, 0, content);
        delimiters.splice(_toPos, 0, delimiter);
        _toPos++;
      } else if (operation === '\\') {
        var previousOperation = _hunk.lines[j - 1] ? _hunk.lines[j - 1][0] : null;

        if (previousOperation === '+') {
          removeEOFNL = true;
        } else if (previousOperation === '-') {
          addEOFNL = true;
        }
      }
    }
  } // Handle EOFNL insertion/removal


  if (removeEOFNL) {
    while (!lines[lines.length - 1]) {
      lines.pop();
      delimiters.pop();
    }
  } else if (addEOFNL) {
    lines.push('');
    delimiters.push('\n');
  }

  for (var _k = 0; _k < lines.length - 1; _k++) {
    lines[_k] = lines[_k] + delimiters[_k];
  }

  return lines.join('');
} // Wrapper that supports multiple file patches via callbacks.


function applyPatches(uniDiff, options) {
  if (typeof uniDiff === 'string') {
    uniDiff =
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    (0,
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    /*istanbul ignore start*/
    _parse
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    .
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    parsePatch)
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    (uniDiff);
  }

  var currentIndex = 0;

  function processIndex() {
    var index = uniDiff[currentIndex++];

    if (!index) {
      return options.complete();
    }

    options.loadFile(index, function (err, data) {
      if (err) {
        return options.complete(err);
      }

      var updatedContent = applyPatch(data, index, options);
      options.patched(index, updatedContent, function (err) {
        if (err) {
          return options.complete(err);
        }

        processIndex();
      });
    });
  }

  processIndex();
}
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