OCaml compiler library : Pparse

`sig
type error = CannotRun of string | WrongMagic of string
exception Error of Pparse.error
val preprocess : string -> string
val remove_preprocessed : string -> unit
type 'a ast_kind =
Structure : Parsetree.structure Pparse.ast_kind
| Signature : Parsetree.signature Pparse.ast_kind
val read_ast : 'a Pparse.ast_kind -> string -> 'a
val write_ast : 'a Pparse.ast_kind -> string -> 'a -> unit
val file :
tool_name:string ->
string -> (Stdlib.Lexing.lexbuf -> 'a) -> 'a Pparse.ast_kind -> 'a
val apply_rewriters :
?restore:bool -> tool_name:string -> 'a Pparse.ast_kind -> 'a -> 'a
val apply_rewriters_str :
?restore:bool ->
tool_name:string -> Parsetree.structure -> Parsetree.structure
val apply_rewriters_sig :
?restore:bool ->
tool_name:string -> Parsetree.signature -> Parsetree.signature
val report_error : Stdlib.Format.formatter -> Pparse.error -> unit
val parse_implementation :
tool_name:string -> string -> Parsetree.structure
val parse_interface : tool_name:string -> string -> Parsetree.signature
val call_external_preprocessor : string -> string -> string
val open_and_check_magic : string -> string -> Stdlib.in_channel * bool
end`