ppxlib

A comprehensive toolbox for ppx development. It features:
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Library
Module
Module type
Parameter
Class
Class type
Library ppxlib
Module Ppxlib . Ast_traverse

To use these classes, inherit from them and override the methods corresponding to the types from Parsetree you want to process. For instance to collect all the string constants in a structure:

let string_constants_of = object
  inherit [string list] Ast_traverse.fold as super

  method! expression e acc =
    let acc = super#expression e acc in
    match e.pexp_desc with
    | Pexp_constant (Const_string (s, _)) -> s :: acc
    | _ -> acc

  method! pattern p acc =
    let acc = super#pattern p acc in
    match p.ppat_desc with
    | Ppat_constant (Const_string (s, _)) -> s :: acc
    | _ -> acc
end

let string_constants_of_structure = string_constants_of#structure
class map : object ... end
class iter : object ... end
class 'acc fold : object ... end
class 'acc fold_map : object ... end
class 'ctx map_with_context : object ... end
class virtual 'res lift : object ... end
class sexp_of : object ... end
val sexp_of : sexp_of