Script which works on top of HexRays decompiler via HRAST.
This isn't a detailed but brief description of how it works.
This script is a try to solve problem of resolving virtual functions calls inside of binary files. In hexrays view virtual calls looks like sequence of tokens - cot_call, cot_cast(optional), cot_memptr, then other tokens (it's not interesting for us). In c-style it looks like foo.vtable->virtual_function(...). So this script is trying to solve the problem, matching pieces of function's AST in HexRays and post-processing it then.