Supporting New Langauges

The steps to cover a new programming language are:

  1. Write the grammar. This is the hardest part.

  2. Write a parser (a parser simply parses an input based on your grammar to yield a parse tree).

  3. Test your grammar, to ensure it is able to parse real-life language files.

  4. Write a few parse tree visitors. Some visitors will compute metrics such as executable lines, while others will enforce coding rules. A dozen or so visitors is sufficient for an initial release.

  5. Write a scanner Sensor, in a SonarQube plugin, to launch the visitors.

  6. Compute

    1. issues
    2. raw measures
    3. code duplications
    4. syntax highlighting
    5. symbol table
    6. coverage information (lines/branches to cover, line/branch hits)

In fulfilling these steps, the SonarSource Language Recognizer (SSLR) can be an important resource.