This tool is an IntelliJ IDEA plugin.
In this version, the core of the plugin is based on SRCML. In essence, the source-code of the project is encoded in an XML file. This XML file is then processed via XPath queries for different rules. The main XML file is a variable in the plugin code and is not accessible out of it. However, the temporary process results are written in files in the project folder. Removing these files are safe.
There must be two files named ruleJson.txt and tagJson.txt in the project folder. The example for these files can be found in README.md in active-doc-client repository.