SolMet is a static analysis based metric calculator tool for Solidity smart contract programs. It is a Work In Progress, supporting the following metrics
- SLOC - number of source code lines
- LLOC - number of logical code lines (lines without empty and comment lines)
- CLOC - number of comment lines
- NF - number of functions
- McCC - McCabe's cyclomatic complexity
- WMC - weighted sum of McCabe's style complexity over the functions of a contract
- NL - the deepest nesting level of control structures in functions summed for a contract
- NLE - nesting level else-if
- NUMPAR -number of parameters
- NOS - number of statements
- DIT - depth of inheritance tree
- NOA - number of ancestors
- NOD - number of descendants
- CBO - coupling between object classes
- NA - number of attributes (i.e. states)
- NOI - number of outgoing invocations (i.e. fan-out)
You can build the tool with Maven to get an executable jar file:
mvn package
Usage is very simple, the built jar is executable. It requires two parameters:
- a Solidity file or a folder containing Solidity files
- an output csv file path.
java -jar solmet-0.1.jar [input(s)] [output]
Hegedűs P., "Towards Analyzing the Complexity Landscape of Solidity Based Ethereum Smart Contracts", ACM/IEEE 1st International Workshop on Emerging Trends in Software Engineering for Blockchain, 2018 [PDF]
The output is a comma separated file containing the values of the calculated metrics for each analyzed contracts/libraries/interfaces.
The parser is based on the excellent antlr4 grammar available at https://github.com/solidityj/solidity-antlr4.