Can you write more detailed build instructions? This is just not enough:
Instructions https://www.jetbrains.com/help/idea/2016.3/plugin-development-guidelines.html
Lexer is generated using IDEA JFlex modification.
Parser classes are generated with Grammar Kit plugin.
To generate _PascalLexer class open pascal.flex, right click and choose "Run JFlex generator".
To generate parser classes open pascal.bnf, right click and choose "Generate parser code".
There are JUnit tests. Please ensure the tests passing before creating pull requests.
Can you write more detailed build instructions? This is just not enough: