Ast_traverse (ppxlib.Ppxlib.Ast

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 map_with_path : string map_with_context

class map_with_expansion_context : Expansion_context.Base.t map_with_context

class virtual 'res lift : object ... end

class sexp_of : object ... end

val sexp_of : sexp_of