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

exports.__esModule = true;
exports. /*istanbul ignore end*/applyPatch = applyPatch;
/*istanbul ignore start*/exports. /*istanbul ignore end*/applyPatches = applyPatches;

var /*istanbul ignore start*/_parse = require('./parse') /*istanbul ignore end*/;

var /*istanbul ignore start*/_distanceIterator = require('../util/distance-iterator') /*istanbul ignore end*/;

/*istanbul ignore start*/
var _distanceIterator2 = _interopRequireDefault(_distanceIterator);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

/*istanbul ignore end*/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 = /*istanbul ignore start*/(0, _parse.parsePatch) /*istanbul ignore end*/(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 = /*istanbul ignore start*/void 0 /*istanbul ignore end*/,
      addEOFNL = /*istanbul ignore start*/void 0 /*istanbul ignore end*/;

  /**
   * 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[0],
          content = line.substr(1);

      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 = /*istanbul ignore start*/(0, _distanceIterator2['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
  for (var _i = 0; _i < hunks.length; _i++) {
    var _hunk = hunks[_i],
        _toPos = _hunk.offset + _hunk.newStart - 1;
    if (_hunk.newLines == 0) {
      _toPos++;
    }

    for (var j = 0; j < _hunk.lines.length; j++) {
      var line = _hunk.lines[j],
          operation = line[0],
          content = line.substr(1),
          delimiter = _hunk.linedelimiters[j];

      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 = /*istanbul ignore start*/(0, _parse.parsePatch) /*istanbul ignore end*/(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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j < hunk.lines.length; j++) {\n      let line = hunk.lines[j],\n          operation = line[0],\n          content = line.substr(1);\n\n      if (operation === ' ' || operation === '-') {\n        // Context sanity check\n        if (!compareLine(toPos + 1, lines[toPos], operation, content)) {\n          errorCount++;\n\n          if (errorCount > fuzzFactor) {\n            return false;\n          }\n        }\n        toPos++;\n      }\n    }\n\n    return true;\n  }\n\n  // Search best fit offsets for each hunk based on the previous ones\n  for (let i = 0; i < hunks.length; i++) {\n    let hunk = hunks[i],\n        maxLine = lines.length - hunk.oldLines,\n        localOffset = 0,\n        toPos = offset + hunk.oldStart - 1;\n\n    let iterator = distanceIterator(toPos, minLine, maxLine);\n\n    for (; localOffset !== undefined; localOffset = iterator()) {\n      if (hunkFits(hunk, toPos + localOffset)) {\n        hunk.offset = offset += localOffset;\n        break;\n      }\n    }\n\n    if (localOffset === undefined) {\n      return false;\n    }\n\n    // Set lower text limit to end of the current hunk, so next ones don't try\n    // to fit over already patched text\n    minLine = hunk.offset + hunk.oldStart + hunk.oldLines;\n  }\n\n  // Apply patch hunks\n  for (let i = 0; i < hunks.length; i++) {\n    let hunk = hunks[i],\n        toPos = hunk.offset + hunk.newStart - 1;\n    if (hunk.newLines == 0) { toPos++; }\n\n    for (let j = 0; j < hunk.lines.length; j++) {\n      let line = hunk.lines[j],\n          operation = line[0],\n          content = line.substr(1),\n          delimiter = hunk.linedelimiters[j];\n\n      if (operation === ' ') {\n        toPos++;\n      } else if (operation === '-') {\n        lines.splice(toPos, 1);\n        delimiters.splice(toPos, 1);\n      /* istanbul ignore else */\n      } else if (operation === '+') {\n        lines.splice(toPos, 0, content);\n        delimiters.splice(toPos, 0, delimiter);\n        toPos++;\n      } else if (operation === '\\\\') {\n        let previousOperation = hunk.lines[j - 1] ? hunk.lines[j - 1][0] : null;\n        if (previousOperation === '+') {\n          removeEOFNL = true;\n        } else if (previousOperation === '-') {\n          addEOFNL = true;\n        }\n      }\n    }\n  }\n\n  // Handle EOFNL insertion/removal\n  if (removeEOFNL) {\n    while (!lines[lines.length - 1]) {\n      lines.pop();\n      delimiters.pop();\n    }\n  } else if (addEOFNL) {\n    lines.push('');\n    delimiters.push('\\n');\n  }\n  for (let _k = 0; _k < lines.length - 1; _k++) {\n    lines[_k] = lines[_k] + delimiters[_k];\n  }\n  return lines.join('');\n}\n\n// Wrapper that supports multiple file patches via callbacks.\nexport function applyPatches(uniDiff, options) {\n  if (typeof uniDiff === 'string') {\n    uniDiff = parsePatch(uniDiff);\n  }\n\n  let currentIndex = 0;\n  function processIndex() {\n    let index = uniDiff[currentIndex++];\n    if (!index) {\n      return options.complete();\n    }\n\n    options.loadFile(index, function(err, data) {\n      if (err) {\n        return options.complete(err);\n      }\n\n      let updatedContent = applyPatch(data, index, options);\n      options.patched(index, updatedContent, function(err) {\n        if (err) {\n          return options.complete(err);\n        }\n\n        processIndex();\n      });\n    });\n  }\n  processIndex();\n}\n"]}