Package: lizard
Lizard is an extensible Cyclomatic Complexity Analyzer for many programming languages
including C/C++ (doesn’t require all the header files or Java imports). It also does
copy-paste detection (code clone detection/code duplicate detection) and many other forms of static
code analysis.A list of supported languages:C/C++ (works with C++14)JavaC# (C Sharp)JavaScript (With ES6 and JSX)TypeScriptObjective-CSwiftPythonRubyTTCN-3PHPScalaGDScriptGolangLuaRustFortranKotlinBy default lizard will search for any source code that it knows and mix
all the results together. This might not be what you want. You can use
the “-l” option to select language(s).It countsthe 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 really ‘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).Installationlizard.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.pyIf you want a proper install:[sudo] pip install lizardOr if you’ve got the source:[sudo] python setup.py install --install-dir=/path/to/installation/directory/Usagelizard [options] [PATH or FILE] [PATH] ...Run for the code under current folder (recursively):lizardExclude anything in the tests folder:lizard mySource/ -x"./tests/*"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, csharp,
                      javascript, python, objectivec, ttcn, ruby, php, swift, scala, GDScript,
                      go, lua, rust, typescript
-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
-f INPUT_FILE, --input_file INPUT_FILE
                      get a list of filenames from the given file
-o OUTPUT_FILE, --output_file OUTPUT_FILE
                      Output file. The output format is inferred from the file extension (e.g.
                      .html), unless it is explicitly specified (e.g. using --xml).
-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
--warning-msvs        Show warnings only, using Visual Studio's warning format for printing
                      warnings. https://msdn.microsoft.com/en-us/library/yxkt8b26.aspx
-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. If the number is
                      negative, the tool exits normally regardless of the number of warnings.
                      Useful in makefile for legacy code.
-x EXCLUDE, --exclude EXCLUDE
                      Exclude files that match the 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.
-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.
-X, --xml             Generate XML in cppncss style instead of the tabular output. Useful to
                      generate report in Jenkins server
--csv                 Generate CSV output as a transform of the default output
-H, --html            Output HTML report
-m, --modified        Calculate modified cyclomatic complexity number , which count a
                      switch/case with multiple cases as one CCN.
-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.
                      -EIgnoreAssert: to ignore all code in assert. -ENS: count nested control
                      structures.
-s SORTING, --sort SORTING
                      Sort the warning with field. The field can be nloc,
                      cyclomatic_complexity, token_count, parameter_count, etc. Or an customized field.
-T THRESHOLDS, --Threshold THRESHOLDS
                      Set the limit for a field. The field can be nloc, cyclomatic_complexity,
                      token_count, parameter_count, etc. Or an customized file. Lizard will
                      report warning if a function exceed the limit
-W WHITELIST, --whitelist WHITELIST
                      The path and file name to the whitelist file. It's './whitelizard.txt' by
                      default. Find more information in README.Example useAnalyze 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    0.12Warnings 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=25The option-Tcyclomatic_complexity=10is equal to-C10.
The option-Tlength=10is equal to-L10.
The option-Tparameter_count=10is equal to-a10.You can also do-Tnloc=10to set the limit of the NLOC. Any function that
has NLOC greater than 10 will generate a warning.Generated codeLizard has a simple solution with generated code. Any code in a source file that is following
a comment containing “GENERATED CODE” will be ignored completely. The ignored code will not
generate any data, except the file counting.Code Duplicate Detectorlizard -Eduplicate <path to your code>Generate A Tag Cloud For Your CodeYou can generate a “Tag cloud” of your code by the following command. It counts the identifiers in your code (ignoring the comments).lizard -EWordCount <path to your code>Using lizard as Python moduleYou can also use lizard as a Python module in your code:>>>importlizard>>>i=lizard.analyze_file("../cpputest/tests/AllTests.cpp")>>>printi.__dict__{'nloc':9,'function_list':[<lizard.FunctionInfoobjectat0x10bf7af10>],'filename':'../cpputest/tests/AllTests.cpp'}>>>printi.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).>>>i=lizard.analyze_file.analyze_source_code("AllTests.cpp","int foo(){}")WhitelistIf 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 needs to
be exactly the same relative path as Lizard to find the file. An easy way to get the file pathname is to 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 multiple lines or split with comma.
file/path/name:function1, function2  # you can also specify the filenameOptions in CommentsYou 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
    ...
}LimitationsLizard requires syntactically correct code.
Upon processing input with incorrect or unknown syntax:Lizard guarantees to terminate eventually (i.e., no forever loops, hangs)
without hard failures (e.g., exit, crash, exceptions).There is a chance of a combination of the following soft failures:omissionmisinterpretationimproper analysis / tallysuccess (the code under consideration is not relevant, e.g., global macros in C)This approach makes the Lizard implementation
simpler and more focused with partial parsers for various languages.
Developers of Lizard attempt to minimize the possibility of soft failures.
Hard failures are bugs in Lizard code,
while soft failures are trade-offs or potential bugs.In addition to asserting the correct code,
Lizard may choose not to deal with some advanced or complicated language features:C/C++ digraphs and trigraphs are not recognized.C/C++ preprocessing or macro expansion is not performed.
For example, using macro instead of parentheses (or partial statements in macros)
can confuse Lizard’s bracket stacks.Some C++ complicated templates may cause confusion with matching angle brackets
and processing less-than<or more-than>operators
inside of template arguments.Literatures Referring to LizardLizard is often used in software related researches. If you used it to support your work, you may contact the lizard author to add your work in the following list.Software Quality in the ATLAS experiment at CERN, which refers to Lizard as one of the tools, has been published in the Journal of Physics:http://iopscience.iop.org/article/10.1088/1742-6596/898/7/072011S Martin-Haugh et al 2017 J. Phys.: Conf. Ser. 898 072011Lizard is also used as a plugin for fastlane to help check code complexity and submit xml report to sonar.fastlane-plugin-lizardsonarEuropean research project FASTEN (Fine-grained Analysis of SofTware Ecosystems as Networks,-for a quality analyzer