parse.js ➔ ... ➔ parseHunk   F
last analyzed

Complexity

Conditions 20
Paths 24

Size

Total Lines 61
Code Lines 39

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
cc 20
eloc 39
nc 24
nop 0
dl 0
loc 61
rs 0
c 0
b 0
f 0

How to fix   Long Method    Complexity   

Long Method

Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.

For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.

Commonly applied refactorings include:

Complexity

Complex classes like parse.js ➔ ... ➔ parseHunk often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.

Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.

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/*istanbul ignore start*/'use strict';
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exports.__esModule = true;
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exports. /*istanbul ignore end*/parsePatch = parsePatch;
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function parsePatch(uniDiff) {
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  /*istanbul ignore start*/var /*istanbul ignore end*/options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
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  var diffstr = uniDiff.split(/\r\n|[\n\v\f\r\x85]/),
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      delimiters = uniDiff.match(/\r\n|[\n\v\f\r\x85]/g) || [],
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      list = [],
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      i = 0;
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  function parseIndex() {
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    var index = {};
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    list.push(index);
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    // Parse diff metadata
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    while (i < diffstr.length) {
0 ignored issues
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Bug introduced by
The variable i is changed as part of the while loop for example by i++ on line 32. Only the value of the last iteration will be visible in this function if it is called after the loop.
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      var line = diffstr[i];
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      // File header found, end parsing diff metadata
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      if (/^(\-\-\-|\+\+\+|@@)\s/.test(line)) {
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        break;
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      }
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      // Diff index
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      var header = /^(?:Index:|diff(?: -r \w+)+)\s+(.+?)\s*$/.exec(line);
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      if (header) {
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        index.index = header[1];
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      }
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      i++;
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    }
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    // Parse file headers if they are defined. Unified diff requires them, but
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    // there's no technical issues to have an isolated hunk without file header
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    parseFileHeader(index);
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    parseFileHeader(index);
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    // Parse hunks
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    index.hunks = [];
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    while (i < diffstr.length) {
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      var _line = diffstr[i];
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      if (/^(Index:|diff|\-\-\-|\+\+\+)\s/.test(_line)) {
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        break;
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      } else if (/^@@/.test(_line)) {
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        index.hunks.push(parseHunk());
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      } else if (_line && options.strict) {
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        // Ignore unexpected content unless in strict mode
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        throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(_line));
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      } else {
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        i++;
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      }
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    }
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  }
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  // Parses the --- and +++ headers, if none are found, no lines
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  // are consumed.
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  function parseFileHeader(index) {
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    var headerPattern = /^(---|\+\+\+)\s+([\S ]*)(?:\t(.*?)\s*)?$/;
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    var fileHeader = headerPattern.exec(diffstr[i]);
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    if (fileHeader) {
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      var keyPrefix = fileHeader[1] === '---' ? 'old' : 'new';
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      var fileName = fileHeader[2].replace(/\\\\/g, '\\');
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      if (/^".*"$/.test(fileName)) {
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        fileName = fileName.substr(1, fileName.length - 2);
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      }
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      index[keyPrefix + 'FileName'] = fileName;
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      index[keyPrefix + 'Header'] = fileHeader[3];
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      i++;
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    }
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  }
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  // Parses a hunk
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  // This assumes that we are at the start of a hunk.
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  function parseHunk() {
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    var chunkHeaderIndex = i,
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        chunkHeaderLine = diffstr[i++],
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        chunkHeader = chunkHeaderLine.split(/@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/);
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    var hunk = {
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      oldStart: +chunkHeader[1],
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      oldLines: +chunkHeader[2] || 1,
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      newStart: +chunkHeader[3],
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      newLines: +chunkHeader[4] || 1,
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      lines: [],
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      linedelimiters: []
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    };
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    var addCount = 0,
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        removeCount = 0;
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    for (; i < diffstr.length; i++) {
0 ignored issues
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Bug introduced by
The variable i is changed as part of the for loop for example by i++ on line 95. Only the value of the last iteration will be visible in this function if it is called after the loop.
Loading history...
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      // Lines starting with '---' could be mistaken for the "remove line" operation
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      // But they could be the header for the next file. Therefore prune such cases out.
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      if (diffstr[i].indexOf('--- ') === 0 && i + 2 < diffstr.length && diffstr[i + 1].indexOf('+++ ') === 0 && diffstr[i + 2].indexOf('@@') === 0) {
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        break;
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      }
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      var operation = diffstr[i][0];
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      if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\') {
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        hunk.lines.push(diffstr[i]);
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        hunk.linedelimiters.push(delimiters[i] || '\n');
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        if (operation === '+') {
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          addCount++;
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        } else if (operation === '-') {
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          removeCount++;
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        } else if (operation === ' ') {
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          addCount++;
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          removeCount++;
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        }
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      } else {
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        break;
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      }
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    }
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    // Handle the empty block count case
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    if (!addCount && hunk.newLines === 1) {
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      hunk.newLines = 0;
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    }
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    if (!removeCount && hunk.oldLines === 1) {
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      hunk.oldLines = 0;
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    }
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    // Perform optional sanity checking
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    if (options.strict) {
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      if (addCount !== hunk.newLines) {
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        throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
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      }
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      if (removeCount !== hunk.oldLines) {
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        throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
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      }
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    }
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    return hunk;
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  }
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  while (i < diffstr.length) {
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    parseIndex();
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  }
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  return list;
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}
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Unified diff requires them, but\n    // there's no technical issues to have an isolated hunk without file header\n    parseFileHeader(index);\n    parseFileHeader(index);\n\n    // Parse hunks\n    index.hunks = [];\n\n    while (i < diffstr.length) {\n      let line = diffstr[i];\n\n      if (/^(Index:|diff|\\-\\-\\-|\\+\\+\\+)\\s/.test(line)) {\n        break;\n      } else if (/^@@/.test(line)) {\n        index.hunks.push(parseHunk());\n      } else if (line && options.strict) {\n        // Ignore unexpected content unless in strict mode\n        throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(line));\n      } else {\n        i++;\n      }\n    }\n  }\n\n  // Parses the --- and +++ headers, if none are found, no lines\n  // are consumed.\n  function parseFileHeader(index) {\n    const headerPattern = /^(---|\\+\\+\\+)\\s+([\\S ]*)(?:\\t(.*?)\\s*)?$/;\n    const fileHeader = headerPattern.exec(diffstr[i]);\n    if (fileHeader) {\n      let keyPrefix = fileHeader[1] === '---' ? 'old' : 'new';\n      let fileName = fileHeader[2].replace(/\\\\\\\\/g, '\\\\');\n      if (/^\".*\"$/.test(fileName)) {\n        fileName = fileName.substr(1, fileName.length - 2);\n      }\n      index[keyPrefix + 'FileName'] = fileName;\n      index[keyPrefix + 'Header'] = fileHeader[3];\n\n      i++;\n    }\n  }\n\n  // Parses a hunk\n  // This assumes that we are at the start of a hunk.\n  function parseHunk() {\n    let chunkHeaderIndex = i,\n        chunkHeaderLine = diffstr[i++],\n        chunkHeader = chunkHeaderLine.split(/@@ -(\\d+)(?:,(\\d+))? \\+(\\d+)(?:,(\\d+))? @@/);\n\n    let hunk = {\n      oldStart: +chunkHeader[1],\n      oldLines: +chunkHeader[2] || 1,\n      newStart: +chunkHeader[3],\n      newLines: +chunkHeader[4] || 1,\n      lines: [],\n      linedelimiters: []\n    };\n\n    let addCount = 0,\n        removeCount = 0;\n    for (; i < diffstr.length; i++) {\n      // Lines starting with '---' could be mistaken for the \"remove line\" operation\n      // But they could be the header for the next file. Therefore prune such cases out.\n      if (diffstr[i].indexOf('--- ') === 0\n            && (i + 2 < diffstr.length)\n            && diffstr[i + 1].indexOf('+++ ') === 0\n            && diffstr[i + 2].indexOf('@@') === 0) {\n          break;\n      }\n      let operation = diffstr[i][0];\n\n      if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\\\') {\n        hunk.lines.push(diffstr[i]);\n        hunk.linedelimiters.push(delimiters[i] || '\\n');\n\n        if (operation === '+') {\n          addCount++;\n        } else if (operation === '-') {\n          removeCount++;\n        } else if (operation === ' ') {\n          addCount++;\n          removeCount++;\n        }\n      } else {\n        break;\n      }\n    }\n\n    // Handle the empty block count case\n    if (!addCount && hunk.newLines === 1) {\n      hunk.newLines = 0;\n    }\n    if (!removeCount && hunk.oldLines === 1) {\n      hunk.oldLines = 0;\n    }\n\n    // Perform optional sanity checking\n    if (options.strict) {\n      if (addCount !== hunk.newLines) {\n        throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));\n      }\n      if (removeCount !== hunk.oldLines) {\n        throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));\n      }\n    }\n\n    return hunk;\n  }\n\n  while (i < diffstr.length) {\n    parseIndex();\n  }\n\n  return list;\n}\n"]}
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