Interactive command-line asis tool
ASIS is the Ada Semantic Interface Specification; it is an application programming interface that allows Ada programs to inspect the structure of other Ada programs. GNAT, the GNU Ada compiler, can parse Ada source text and produce tree files suitable for use through ASIS.
asistant is an interactive command-line tool with a simple language that allows you to inspect the semantic information about a compiled program. Thus you can learn ASIS and try ASIS queries interactively before writing them in your programs.
Documentation about the ASIS tools may be found in /usr/share/doc/asis-doc/ if the asis-doc package is installed. The reference documentation about ASIS is excluded due to license problems, but may be found in various formats at http://libre.adacore.com/developers/documentation.