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utils.ml
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open Ppxlib open Parsetree open Ast_helper let attribute_name = "ppx_ts" type attribute_kind = | KeyOf of string * payload | SetType of string * payload | ToGeneric of string * payload | Partial of string * payload | Pick of string * payload | Omit of string * payload type extension_kind = | KeyOf of string * string list * payload * attributes | SetType of string * string list * payload * attributes | SetTypeExceptBool of string * string list * payload * attributes | ToGeneric of string * string list * payload * attributes | Partial of string * string list * payload * attributes | Pick of string * string list * payload * attributes | Omit of string * string list * payload * attributes let suffix_key_of = "keyOf" let suffix_set_type = "setType" let suffix_set_type_except_bool = "setTypeExceptBool" let suffix_to_generic = "toGeneric" let suffix_partial = "partial" let suffix_pick = "pick" let suffix_omit = "omit" let suffix_key_to_string = "keyToString" (* make attribute name to suffix string *) let mk_attr_with_suffix attr_name suffix = attr_name ^ "." ^ suffix let loc = !default_loc let fail loc message = Location.raise_errorf ~loc "%s" message let mkloc txt loc = { Location.txt; loc } let mknoloc txt = mkloc txt Location.none let lid ?(loc = Location.none) s = mkloc (Longident.parse s) loc let get_attribute_by_name attributes name = let filtered = attributes |> List.filter (fun { attr_name = { Location.txt } } -> txt = name) in match filtered with | [] -> Ok None | [ attribute ] -> Ok (Some attribute) | _ -> Error ("Too many occurrences of \"" ^ name ^ "\" attribute") let get_expression_from_payload payload = match payload with | PStr [ { pstr_desc } ] -> ( match pstr_desc with | Pstr_eval (expr, _) -> expr | _ -> fail loc "Expected expression as attribute payload") | _ -> fail loc "Expected expression as attribute payload" let parse_attribute { attr_name = { Location.txt }; attr_payload } : attribute_kind option = if txt = mk_attr_with_suffix attribute_name suffix_key_of then Some (KeyOf (suffix_key_of, attr_payload)) else if txt = mk_attr_with_suffix attribute_name suffix_set_type then Some (SetType (suffix_set_type, attr_payload)) else if txt = mk_attr_with_suffix attribute_name suffix_to_generic then Some (ToGeneric (suffix_to_generic, attr_payload)) else if txt = mk_attr_with_suffix attribute_name suffix_partial then Some (Partial (suffix_partial, attr_payload)) else if txt = mk_attr_with_suffix attribute_name suffix_pick then Some (Pick (suffix_pick, attr_payload)) else if txt = mk_attr_with_suffix attribute_name suffix_omit then Some (Omit (suffix_omit, attr_payload)) else None let parse_extension { ptype_name; ptype_manifest; ptype_attributes } : extension_kind option = match ptype_manifest with | Some { ptyp_desc = Ptyp_extension ({ Location.txt }, payload) } -> (* type identifier in extension payload *) let type_labels = match get_expression_from_payload payload with | { pexp_desc = Pexp_ident lid } -> Longident.flatten_exn lid.txt (* %ppx_ts.setType(t, string) *) | { pexp_desc = Pexp_tuple [ { pexp_desc = Pexp_ident lid }; { pexp_desc = Pexp_ident _ } ]; } -> Longident.flatten_exn lid.txt | _ -> fail Location.none "Missing type identifier" in if txt = mk_attr_with_suffix attribute_name suffix_key_of then Some (KeyOf (ptype_name.txt, type_labels, payload, ptype_attributes)) else if txt = mk_attr_with_suffix attribute_name suffix_set_type then Some (SetType (ptype_name.txt, type_labels, payload, ptype_attributes)) else if txt = mk_attr_with_suffix attribute_name suffix_set_type_except_bool then Some (SetTypeExceptBool (ptype_name.txt, type_labels, payload, ptype_attributes)) else if txt = mk_attr_with_suffix attribute_name suffix_to_generic then Some (ToGeneric (ptype_name.txt, type_labels, payload, ptype_attributes)) else if txt = mk_attr_with_suffix attribute_name suffix_partial then Some (Partial (ptype_name.txt, type_labels, payload, ptype_attributes)) else if txt = mk_attr_with_suffix attribute_name suffix_pick then Some (Pick (ptype_name.txt, type_labels, payload, ptype_attributes)) else if txt = mk_attr_with_suffix attribute_name suffix_omit then Some (Omit (ptype_name.txt, type_labels, payload, ptype_attributes)) else None | _ -> None (* get type declaration by label inside module or top-level pstr *) let rec get_type_decl_from_str_by_labels structure labels = let matched_decls = match labels with | [] -> fail Location.none "Can not find type declaration with given type identifier" | [ label ] -> structure |> List.filter_map (fun { pstr_desc } -> match pstr_desc with | Pstr_type (_, decls) -> ( let matched_decl = decls |> List.filter (fun { ptype_name = { Location.txt } } -> txt = label) in match matched_decl with | [] -> None | [ decl ] | decl :: _ -> Some decl) | _ -> None) | label :: labels -> structure |> List.filter_map (fun { pstr_desc } -> match pstr_desc with (* module Foo = ... *) | Pstr_module { pmb_name; pmb_expr = { pmod_desc = Pmod_structure structure }; } -> if pmb_name.txt = Some label then get_type_decl_from_str_by_labels structure labels else None (* module Foo: Foo = ... *) | Pstr_module { pmb_name; pmb_expr = { pmod_desc = Pmod_constraint ({ pmod_desc = Pmod_structure structure }, _); }; } -> if pmb_name.txt = Some label then get_type_decl_from_str_by_labels structure labels else None | _ -> None) in match matched_decls with [] -> None | [ decl ] | decl :: _ -> Some decl (* get type declaration by label inside module or top-level *) let rec get_type_decl_from_sig_by_labels signature labels = let matched_decls = match labels with | [] -> fail Location.none "Can not find type declaration with given type identifier" | [ label ] -> signature |> List.filter_map (fun { psig_desc } -> match psig_desc with | Psig_type (_, decls) -> ( let matched_decl = decls |> List.filter (fun { ptype_name = { Location.txt } } -> txt = label) in match matched_decl with | [] -> None | [ decl ] | decl :: _ -> Some decl) | _ -> None) | label :: labels -> signature |> List.filter_map (fun { psig_desc } -> match psig_desc with | Psig_modtype { pmtd_name; pmtd_type = Some { pmty_desc = Pmty_signature signature }; } -> if pmtd_name.txt = label then get_type_decl_from_sig_by_labels signature labels else None | _ -> None) in match matched_decls with [] -> None | [ decl ] | decl :: _ -> Some decl (* make constructor declaration with label *) let make_const_decls labels loc = labels |> List.map (fun label -> String.capitalize_ascii label) |> List.map (fun label -> Type.constructor ~loc (mkloc label loc)) let make_match_case labels = labels |> List.map (fun key -> Exp.case (Pat.construct (lid (String.capitalize_ascii key)) None) (Exp.constant (Const.string key))) (* make label_declaration with new type constructor using lid *) let make_label_decls_with_core_type ?(except_bool = false) ?(is_option = false) decls core_type = decls |> List.map (fun { pld_name; pld_loc; pld_type } -> let core_type = match (except_bool, pld_type) with | ( true, { ptyp_desc = Ptyp_constr ({ Location.txt = Lident txt }, _) } ) -> ( match txt with "bool" -> pld_type | _ -> core_type) | _ -> core_type in Type.field ~loc:pld_loc pld_name (match is_option with | true -> Typ.constr (lid "option") [ core_type ] | false -> core_type)) (* make label_declaration with labels *) let make_label_decls_with_labels ?(is_option = false) ?(is_omit = false) decls labels = let matched_decls = if is_omit then decls |> List.filter (fun { pld_name = { Location.txt } } -> labels |> List.exists (fun label -> label <> txt)) else decls |> List.filter (fun { pld_name = { Location.txt } } -> labels |> List.exists (fun label -> label = txt)) in matched_decls |> List.map (fun { pld_name; pld_loc; pld_type } -> Type.field ~loc:pld_loc pld_name (match is_option with | true -> Typ.constr (lid "option") [ pld_type ] | false -> pld_type)) (* make label_declaration with is_option flag *) let make_label_decls ?(is_option = false) decls = decls |> List.map (fun { pld_name; pld_type; pld_loc } -> Type.field ~loc:pld_loc pld_name (match is_option with | true -> Typ.constr (lid "option") [ pld_type ] | false -> pld_type))