Is anybody tried to implement some query-like adds for Dlang for making data selection from some data structures such as object graphs or trees (at least for pegged parsed data) ?

I'm writing tiny tool for KiCAD (EDA CAD), and it would be great to have some tool to write easy-readable declarative-like code for data selections/conversions in memory.

Or maybe someone can recommend book or tutorial about writing object graph traversals, backtracking and matching in C++ to let me make some elements myself?