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Lizard

An extensible Cyclomatic Complexity Analyzer for many programming languages including C/C++ (doesn't require all the header files).

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Visit the tool website |Web Site|

lizard is a simple code complexity analyzer without caring about the C/C++ header files or Java imports. It can deal with

• C/C++ (works with C++14)
• Java
• JavaScript
• Objective C
• Swift
• Python
• Ruby
• TTCN-3

By default lizard will search for any source code that it knows an mix all the result together. This might not be what you want. You can use the "-l" option to select language(s).

It counts

• the nloc (lines of code without comments),
• CCN (cyclomatic complexity number),
• token count of functions.
• parameter count of functions.

You can set limitation for CCN (-C), the number of parameters (-a). Functions that exceed these limitations will generate warnings. The exit code of lizard will be none-Zero if there are warnings.

This tool actually calculates how complex the code 'looks' rather than how complex the code real 'is'. People will need this tool because it's often very hard to get all the included folders and files right when they are complicated. But we don't really need that kind of accuracy for cyclomatic complexity.

It requires python2.7 or above (early versions are not verified).

Installation

lizard.py can be used as a stand alone Python script, most functionalities are there. You can always use it without any installation. To acquire all the functionalities of lizard, you will need a proper install.

::

python lizard.py

If you want a proper install:

::

[sudo] pip install lizard

Or if you've got the source:

::

[sudo] python setup.py install

Usage

::

lizard [options] [PATH or FILE] [PATH] ...

Run for the code under current folder (recursively):

::

lizard

Exclude anything in the tests folder:

::

lizard mySource/ -x"./tests/*"

You can also find a tutorial by @jxieeducation (Jason Xie) from here: http://thrashing.io/tutorial/551891bccfead697722b05ad

Options

::

  -h, --help            show this help message and exit
  --version             show program's version number and exit
  -l LANGUAGES, --languages LANGUAGES
                        List the programming languages you want to analyze. if
                        left empty, it'll search for all languages it knows.
                            lizard -l cpp -l java
                        searches for C++ and Java code.
                        The available languages are: cpp, java, javascript,
                        python, objectivec, ttcn
  -V, --verbose         Output in verbose mode (long function name)
  -C CCN, --CCN CCN     Threshold for cyclomatic complexity number warning.
                        The default value is 15. Functions with CCN bigger
                        than it will generate warning
  -L LENGTH, --length LENGTH
                        Threshold for maximum function length warning. The
                        default value is 1000. Functions length bigger than it
                        will generate warning
  -a ARGUMENTS, --arguments ARGUMENTS
                        Limit for number of parameters
  -w, --warnings_only   Show warnings only, using clang/gcc's warning format
                        for printing warnings.
                        http://clang.llvm.org/docs/UsersManual.html#cmdoption-
                        fdiagnostics-format
  -i NUMBER, --ignore_warnings NUMBER
                        If the number of warnings is equal or less than the
                        number, the tool will exit normally, otherwise it will
                        generate error. Useful in makefile for legacy code.
  -x EXCLUDE, --exclude EXCLUDE
                        Exclude files that match this pattern. * matches
                        everything, ? matches any single character,
                        "./folder/*" exclude everything in the folder
                        recursively. Multiple patterns can be specified. Don't
                        forget to add "" around the pattern.
  -X, --xml             Generate XML in cppncss style instead of the tabular
                        output. Useful to generate report in Jenkins server
  -t WORKING_THREADS, --working_threads WORKING_THREADS
                        number of working threads. The default value is 1.
                        Using a bigger number can fully utilize the CPU and
                        often faster.
  -m, --modified        Calculate modified cyclomatic complexity number
  -E EXTENSIONS, --extension EXTENSIONS
                        User the extensions. The available extensions are:
                        -Ecpre: it will ignore code in the #else branch.
                        -Ewordcount: count word frequencies and generate tag
                        cloud. -Eoutside: include the global code as one
                        function.
  -s SORTING, --sort SORTING
                        Sort the warning with field. The field can be nloc,
                        cyclomatic_complexity, token_count, parameter_count,
                        etc. Or an customized file.
  -W WHITELIST, --whitelist WHITELIST
                        The path and file name to the whitelist file. It's
                        './whitelizard.txt' by default.


Example use
-----------

Analyze a folder recursively: lizard mahjong\_game/src

::

============================================================== NLOC CCN token param function@line@file

   10      2     29      2    start_new_player@26@./html_game.c
  ...
    6      1      3      0    set_shutdown_flag@449@./httpd.c
   24      3     61      1    server_main@454@./httpd.c

---

2 file analyzed.

LOC Avg.NLOC AvgCCN Avg.ttoken function_cnt file

   191     15      3        51        12     ./html_game.c
   363     24      4        86        15     ./httpd.c

====================================== !!!! Warnings (CCN > 15) !!!!

   66     19    247      1    accept_request@64@./httpd.c

================================================================================= Total NLOC Avg.NLOC Avg CCN Avg token Fun Cnt Warning cnt Fun Rt NLOC Rt

      554        20     4.07      71.15       27            1      0.04    0.12

Warnings only (in clang/gcc formation):lizard -w mahjong_game

::

   ./src/html_ui/httpd.c:64: warning: accept_request has 19 CCN and 1 params (66 NLOC, 247 tokens)
   ./src/mahjong_game/mj_table.c:109: warning: mj_table_update_state has 20 CCN and 1 params (72 NLOC, 255 tokens)


Set warning threshold for any field:lizard -T nloc=25

The option -Tcyclomatic_complexity=10 is equal to -C10. The option -Tlength=10 is equal to -L10. The option -Tparameter_count=10 is equal to -a10.

You can also do -Tnloc=10 to set the limit of the NLOC. Any function that has NLOC greater than 10 will generate a warning.

Generate A Tag Cloud For Your Code

You can generate a "Tag cloud" of your code by the following command. It counts the identifiers in your code (ignoring the comments).

::

lizard -EWordCount

Using lizard as Python module

You can also use lizard as a Python module in your code:

.. code:: python

>>> import lizard
>>> i = lizard.analyze_file("../cpputest/tests/AllTests.cpp")
>>> print i.__dict__
{'nloc': 9, 'function_list': [<lizard.FunctionInfo object at 0x10bf7af10>], 'filename': '../cpputest/tests/AllTests.cpp'}
>>> print i.function_list[0].__dict__
{'cyclomatic_complexity': 1, 'token_count': 22, 'name': 'main', 'parameter_count': 2, 'nloc': 3, 'long_name': 'main( int ac , const char ** av )', 'start_line': 30}

You can also use source code string instead of file. But you need to provide a file name (to identify the language).

.. code:: python

>>> i = lizard.analyze_file.analyze_source_code("AllTests.cpp", "int foo(){}")

Whitelist

If for some reason you would like to ignore the warnings, you can use the whitelist. Add 'whitelizard.txt' to the current folder (or use -W to point to the whitelist file), then the functions defined in the file will be ignored. Please notice that if you assign the file pathname, it need to be exactly the same relative path as Lizard find the file. An easy way to get the file pathname is copy it from the Lizard warning output. This is an example whitelist:

::

#whitelizard.txt #The file name can only be whitelizard.txt and put it in the current folder. #You may have commented lines begin with #. function_name1, function_name2 # list function names in mulitple lines or split with comma. file/path/name:function1, function2 # you can also specify the filename

Options in Comments

You can use options in the comments of the source code to change the behavior of lizard. By putting "#lizard forgives" inside a function or before a function it will suppress the warning for that function.

::

int foo() { // #lizard forgives the complexity ... }

Change Logs

• 2016.01.31 Add support for Ruby
• 2016.01.29 Add -T option to set limit for any field
• 2015.12.17 Add support for Swift
• 2015.12.12 Add the -l option to filter language
• 2015.10.22 TTCN-3 added by @gustafj
• 2015.10.06 Add C++11 uniform constructor initialization. Thanks to @rakhimov
• 2015.01.09 Add C preprocessor back by -Ecpre. it will ignore all the #else branch in the C/C++ code.
• 2015.01.07 pass test for linux kernal and other popular open source C/C++ code.
• 2014.04.07 Remove option -e (display function end line), and make it default
• 2014.04.06 Remove option -d (ignore duplicated content), and make it default
• 2014.04.06 Remove option -p (no preprocessor count), and a '#if' will always be counted in cyclomatic complexity
• 2014.03.31 Support JavaScript!
• 2014.03.22 Change the -v (--verbose) option to -V. This is because -v will be used for --version.

.. |Build Status| image:: https://travis-ci.org/terryyin/lizard.png?branch=master :target: https://travis-ci.org/terryyin/lizard

.. |Web Site| image:: http://www.lizard.ws/website/static/img/logo-small.png :target: http://www.lizard.ws