src/Tools/Code/code_printer.ML
author wenzelm
Mon May 20 13:29:45 2013 +0200 (2013-05-20)
changeset 52079 291bb1f4af29
parent 52070 fd497099f5f5
child 52099 6225d5b308f9
permissions -rw-r--r--
tuned signature;
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(*  Title:      Tools/Code/code_printer.ML
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    Author:     Florian Haftmann, TU Muenchen
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Generic operations for pretty printing of target language code.
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*)
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signature CODE_PRINTER =
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sig
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  type itype = Code_Thingol.itype
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  type iterm = Code_Thingol.iterm
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  type const = Code_Thingol.const
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  type dict = Code_Thingol.dict
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  val eqn_error: thm option -> string -> 'a
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  val @@ : 'a * 'a -> 'a list
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  val @| : 'a list * 'a -> 'a list
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  val str: string -> Pretty.T
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  val concat: Pretty.T list -> Pretty.T
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  val brackets: Pretty.T list -> Pretty.T
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  val enclose: string -> string -> Pretty.T list -> Pretty.T
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  val commas: Pretty.T list -> Pretty.T list
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  val enum: string -> string -> string -> Pretty.T list -> Pretty.T
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  val enum_default: string -> string -> string -> string -> Pretty.T list -> Pretty.T
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  val semicolon: Pretty.T list -> Pretty.T
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  val doublesemicolon: Pretty.T list -> Pretty.T
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  val indent: int -> Pretty.T -> Pretty.T
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  val markup_stmt: string -> Pretty.T -> Pretty.T
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  val format: string list -> int -> Pretty.T -> string
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  val first_upper: string -> string
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  val first_lower: string -> string
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  type var_ctxt
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  val make_vars: string list -> var_ctxt
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  val intro_vars: string list -> var_ctxt -> var_ctxt
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  val lookup_var: var_ctxt -> string -> string
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  val intro_base_names: (string -> bool) -> (string -> string)
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    -> string list -> var_ctxt -> var_ctxt
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  val aux_params: var_ctxt -> iterm list list -> string list
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  type literals
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  val Literals: { literal_char: string -> string, literal_string: string -> string,
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        literal_numeral: int -> string,
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        literal_list: Pretty.T list -> Pretty.T, infix_cons: int * string }
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    -> literals
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  val literal_char: literals -> string -> string
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  val literal_string: literals -> string -> string
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  val literal_numeral: literals -> int -> string
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  val literal_list: literals -> Pretty.T list -> Pretty.T
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  val infix_cons: literals -> int * string
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  type lrx
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  val L: lrx
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  val R: lrx
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  val X: lrx
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  type fixity
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  val BR: fixity
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  val NOBR: fixity
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  val INFX: int * lrx -> fixity
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  val APP: fixity
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  val brackify: fixity -> Pretty.T list -> Pretty.T
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  val brackify_infix: int * lrx -> fixity -> Pretty.T * Pretty.T * Pretty.T -> Pretty.T
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  val brackify_block: fixity -> Pretty.T -> Pretty.T list -> Pretty.T -> Pretty.T
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  val gen_applify: bool -> string -> string -> ('a -> Pretty.T) -> fixity -> Pretty.T -> 'a list -> Pretty.T
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  val applify: string -> string -> ('a -> Pretty.T) -> fixity -> Pretty.T -> 'a list -> Pretty.T
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  val tuplify: (fixity -> 'a -> Pretty.T) -> fixity -> 'a list -> Pretty.T option
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  datatype ('a, 'b, 'c, 'd, 'e) symbol_attr =
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    Constant of 'a | Type_Constructor of 'b | Type_Class of 'c | Class_Instance of 'd | Module of 'e
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  val map_symbol_attr: ('a -> 'f) -> ('b -> 'g) -> ('c -> 'h) -> ('d -> 'i) -> ('e -> 'j)
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    -> ('a, 'b, 'c, 'd, 'e) symbol_attr -> ('f, 'g, 'h, 'i, 'j) symbol_attr
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  val maps_symbol_attr: ('a -> 'f list) -> ('b -> 'g list)
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    -> ('c -> 'h list) -> ('d -> 'i list) -> ('e -> 'j list)
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    -> ('a, 'b, 'c, 'd, 'e) symbol_attr -> ('f, 'g, 'h, 'i, 'j) symbol_attr list
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  val maps_symbol_attr': ('a -> ('k * 'f) list) -> ('b -> ('k * 'g) list)
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    -> ('c -> ('k * 'h) list) -> ('d -> ('k * 'i) list) -> ('e -> ('k * 'j) list)
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    -> ('a, 'b, 'c, 'd, 'e) symbol_attr -> ('k * ('f, 'g, 'h, 'i, 'j) symbol_attr) list
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  type ('a, 'b, 'c, 'd, 'e) symbol_data
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  val empty_symbol_data: ('a, 'b, 'c, 'd, 'e) symbol_data
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  val merge_symbol_data: ('a, 'b, 'c, 'd, 'e) symbol_data * ('a, 'b, 'c, 'd, 'e) symbol_data
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    -> ('a, 'b, 'c, 'd, 'e) symbol_data
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  val lookup_constant_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> string -> 'a option
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  val lookup_type_constructor_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> string -> 'b option
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  val lookup_type_class_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> string -> 'c option
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  val lookup_class_instance_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> string * string -> 'd option
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  val lookup_module_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> string -> 'e option
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  val dest_constant_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> (string * 'a) list
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  val dest_type_constructor_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> (string * 'b) list
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  val dest_type_class_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> (string * 'c) list
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  val dest_class_instance_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> ((string * string) * 'd) list
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  val dest_module_data: ('a, 'b, 'c, 'd, 'e) symbol_data -> (string * 'e) list
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  val set_symbol_data: (string * 'a option, string * 'b option, string * 'c option,
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      (string * string) * 'd option, string * 'e option) symbol_attr
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    -> ('a, 'b, 'c, 'd, 'e) symbol_data -> ('a, 'b, 'c, 'd, 'e) symbol_data
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  type simple_const_syntax
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  type complex_const_syntax
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  type const_syntax
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  type activated_complex_const_syntax
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  datatype activated_const_syntax = Plain_const_syntax of int * string
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    | Complex_const_syntax of activated_complex_const_syntax
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  type tyco_syntax
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  val requires_args: const_syntax -> int
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  val parse_const_syntax: const_syntax parser
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  val parse_tyco_syntax: tyco_syntax parser
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  val plain_const_syntax: string -> const_syntax
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  val simple_const_syntax: simple_const_syntax -> const_syntax
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  val complex_const_syntax: complex_const_syntax -> const_syntax
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  val activate_const_syntax: theory -> literals
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    -> string -> const_syntax -> Code_Thingol.naming -> activated_const_syntax * Code_Thingol.naming
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  val gen_print_app: (thm option -> var_ctxt -> const * iterm list -> Pretty.T list)
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    -> (thm option -> var_ctxt -> fixity -> iterm -> Pretty.T)
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    -> (string -> activated_const_syntax option)
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    -> thm option -> var_ctxt -> fixity -> const * iterm list -> Pretty.T
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  val gen_print_bind: (thm option -> var_ctxt -> fixity -> iterm -> Pretty.T)
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    -> thm option -> fixity
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    -> iterm -> var_ctxt -> Pretty.T * var_ctxt
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end;
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structure Code_Printer : CODE_PRINTER =
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struct
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open Code_Thingol;
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(** generic nonsense *)
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fun eqn_error (SOME thm) s =
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      error (s ^ ",\nin equation " ^ Display.string_of_thm_without_context thm)
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  | eqn_error NONE s = error s;
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val code_presentationN = "code_presentation";
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val stmt_nameN = "stmt_name";
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val _ = Markup.add_mode code_presentationN YXML.output_markup;
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(** assembling and printing text pieces **)
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infixr 5 @@;
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infixr 5 @|;
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fun x @@ y = [x, y];
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fun xs @| y = xs @ [y];
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val str = Print_Mode.setmp [] Pretty.str;
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val concat = Pretty.block o Pretty.breaks;
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val commas = Print_Mode.setmp [] Pretty.commas;
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fun enclose l r = Print_Mode.setmp [] (Pretty.enclose l r);
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val brackets = enclose "(" ")" o Pretty.breaks;
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fun enum sep l r = Print_Mode.setmp [] (Pretty.enum sep l r);
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fun enum_default default sep l r [] = str default
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  | enum_default default sep l r xs = enum sep l r xs;
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fun semicolon ps = Pretty.block [concat ps, str ";"];
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fun doublesemicolon ps = Pretty.block [concat ps, str ";;"];
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fun indent i = Print_Mode.setmp [] (Pretty.indent i);
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fun markup_stmt name = Print_Mode.setmp [code_presentationN]
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  (Pretty.mark (code_presentationN, [(stmt_nameN, name)]));
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fun filter_presentation [] tree =
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      Buffer.empty
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      |> fold XML.add_content tree
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  | filter_presentation presentation_names tree =
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      let
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        fun is_selected (name, attrs) =
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          name = code_presentationN
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          andalso member (op =) presentation_names (the (Properties.get attrs stmt_nameN));
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        fun add_content_with_space tree (is_first, buf) =
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          buf
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          |> not is_first ? Buffer.add "\n\n"
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          |> XML.add_content tree
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          |> pair false;
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        fun filter (XML.Elem (name_attrs, xs)) =
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              fold (if is_selected name_attrs then add_content_with_space else filter) xs
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          | filter (XML.Text _) = I;
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      in snd (fold filter tree (true, Buffer.empty)) end;
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fun format presentation_names width =
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  Print_Mode.setmp [code_presentationN] (Pretty.string_of_margin width)
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  #> YXML.parse_body
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  #> filter_presentation presentation_names
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  #> Buffer.add "\n"
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  #> Buffer.content;
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(** names and variable name contexts **)
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type var_ctxt = string Symtab.table * Name.context;
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fun make_vars names = (fold (fn name => Symtab.update_new (name, name)) names Symtab.empty,
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  Name.make_context names);
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fun intro_vars names (namemap, namectxt) =
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  let
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    val (names', namectxt') = fold_map Name.variant names namectxt;
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    val namemap' = fold2 (curry Symtab.update) names names' namemap;
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  in (namemap', namectxt') end;
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fun lookup_var (namemap, _) name =
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  case Symtab.lookup namemap name of
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    SOME name' => name'
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  | NONE => error ("Invalid name in context: " ^ quote name);
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val first_upper = implode o nth_map 0 Symbol.to_ascii_upper o raw_explode;
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val first_lower = implode o nth_map 0 Symbol.to_ascii_lower o raw_explode;
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fun aux_params vars lhss =
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  let
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    fun fish_param _ (w as SOME _) = w
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      | fish_param (IVar (SOME v)) NONE = SOME v
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      | fish_param _ NONE = NONE;
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    fun fillup_param _ (_, SOME v) = v
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      | fillup_param x (i, NONE) = x ^ string_of_int i;
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    val fished1 = fold (map2 fish_param) lhss (replicate (length (hd lhss)) NONE);
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    val x = singleton (Name.variant_list (map_filter I fished1)) "x";
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    val fished2 = map_index (fillup_param x) fished1;
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    val (fished3, _) = fold_map Name.variant fished2 Name.context;
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    val vars' = intro_vars fished3 vars;
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  in map (lookup_var vars') fished3 end;
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fun intro_base_names no_syntax deresolve names = names
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  |> map_filter (fn name => if no_syntax name then
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      let val name' = deresolve name in
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        if Long_Name.is_qualified name' then NONE else SOME name'
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      end else NONE)
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  |> intro_vars;
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(** pretty literals **)
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datatype literals = Literals of {
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  literal_char: string -> string,
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  literal_string: string -> string,
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  literal_numeral: int -> string,
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  literal_list: Pretty.T list -> Pretty.T,
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  infix_cons: int * string
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};
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fun dest_Literals (Literals lits) = lits;
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val literal_char = #literal_char o dest_Literals;
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val literal_string = #literal_string o dest_Literals;
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val literal_numeral = #literal_numeral o dest_Literals;
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val literal_list = #literal_list o dest_Literals;
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val infix_cons = #infix_cons o dest_Literals;
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(** syntax printer **)
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(* binding priorities *)
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datatype lrx = L | R | X;
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datatype fixity =
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    BR
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  | NOBR
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  | INFX of (int * lrx);
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val APP = INFX (~1, L);
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fun fixity_lrx L L = false
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  | fixity_lrx R R = false
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  | fixity_lrx _ _ = true;
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fun fixity NOBR _ = false
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  | fixity _ NOBR = false
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  | fixity (INFX (pr, lr)) (INFX (print_ctxt, lr_ctxt)) =
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      pr < print_ctxt
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      orelse pr = print_ctxt
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        andalso fixity_lrx lr lr_ctxt
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      orelse print_ctxt = ~1
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  | fixity BR (INFX _) = false
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  | fixity _ _ = true;
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fun gen_brackify _ [p] = p
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  | gen_brackify true (ps as _::_) = enclose "(" ")" ps
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  | gen_brackify false (ps as _::_) = Pretty.block ps;
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fun brackify fxy_ctxt =
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  gen_brackify (fixity BR fxy_ctxt) o Pretty.breaks;
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fun brackify_infix infx fxy_ctxt (l, m, r) =
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  gen_brackify (fixity (INFX infx) fxy_ctxt) [l, str " ", m, Pretty.brk 1, r];
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fun brackify_block fxy_ctxt p1 ps p2 =
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  let val p = Pretty.block_enclose (p1, p2) ps
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  in if fixity BR fxy_ctxt
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    then enclose "(" ")" [p]
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    else p
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  end;
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fun gen_applify strict opn cls f fxy_ctxt p [] =
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      if strict
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      then gen_brackify (fixity BR fxy_ctxt) [p, str (opn ^ cls)]
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      else p
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  | gen_applify strict opn cls f fxy_ctxt p ps =
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      gen_brackify (fixity BR fxy_ctxt) (p @@ enum "," opn cls (map f ps));
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fun applify opn = gen_applify false opn;
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fun tuplify _ _ [] = NONE
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  | tuplify print fxy [x] = SOME (print fxy x)
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  | tuplify print _ xs = SOME (enum "," "(" ")" (map (print NOBR) xs));
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(* data for symbols *)
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datatype ('a, 'b, 'c, 'd, 'e) symbol_attr =
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  Constant of 'a | Type_Constructor of 'b | Type_Class of 'c | Class_Instance of 'd | Module of 'e;
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fun map_symbol_attr const tyco class inst module (Constant x) = Constant (const x)
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  | map_symbol_attr const tyco class inst module (Type_Constructor x) = Type_Constructor (tyco x)
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  | map_symbol_attr const tyco class inst module (Type_Class x) = Type_Class (class x)
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  | map_symbol_attr const tyco class inst module (Class_Instance x) = Class_Instance (inst x)
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  | map_symbol_attr const tyco class inst module (Module x) = Module (module x);
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fun maps_symbol_attr const tyco class inst module (Constant x) = map Constant (const x)
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  | maps_symbol_attr const tyco class inst module (Type_Constructor x) = map Type_Constructor (tyco x)
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  | maps_symbol_attr const tyco class inst module (Type_Class x) = map Type_Class (class x)
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  | maps_symbol_attr const tyco class inst module (Class_Instance x) = map Class_Instance (inst x)
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  | maps_symbol_attr const tyco class inst module (Module x) = map Module (module x);
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fun maps_symbol_attr' const tyco class inst module (Constant x) = (map o apsnd) Constant (const x)
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  | maps_symbol_attr' const tyco class inst module (Type_Constructor x) = (map o apsnd) Type_Constructor (tyco x)
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  | maps_symbol_attr' const tyco class inst module (Type_Class x) = (map o apsnd) Type_Class (class x)
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  | maps_symbol_attr' const tyco class inst module (Class_Instance x) = (map o apsnd) Class_Instance (inst x)
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  | maps_symbol_attr' const tyco class inst module (Module x) = (map o apsnd) Module (module x);
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datatype ('a, 'b, 'c, 'd, 'e) symbol_data =
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  Symbol_Data of { constant: 'a Symtab.table, type_constructor: 'b Symtab.table,
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    type_class: 'c Symtab.table, class_instance: 'd Symreltab.table, module: 'e Symtab.table };
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fun make_symbol_data constant type_constructor type_class class_instance module =
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  Symbol_Data { constant = constant, type_constructor = type_constructor,
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    type_class = type_class, class_instance = class_instance, module = module };
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fun dest_symbol_data (Symbol_Data x) = x;
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fun map_symbol_data map_constant map_type_constructor map_type_class map_class_instance map_module
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  (Symbol_Data { constant, type_constructor, type_class, class_instance, module }) =
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    Symbol_Data { constant = map_constant constant, type_constructor = map_type_constructor type_constructor,
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      type_class = map_type_class type_class, class_instance = map_class_instance class_instance,
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        module = map_module module };
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val empty_symbol_data = Symbol_Data { constant = Symtab.empty, type_constructor = Symtab.empty,
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  type_class = Symtab.empty, class_instance = Symreltab.empty, module = Symtab.empty };
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fun merge_symbol_data (Symbol_Data { constant = constant1, type_constructor = type_constructor1,
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    type_class = type_class1, class_instance = class_instance1, module = module1 },
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  Symbol_Data { constant = constant2, type_constructor = type_constructor2,
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    type_class = type_class2, class_instance = class_instance2, module = module2 }) =
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  make_symbol_data (Symtab.join (K snd) (constant1, constant2))
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    (Symtab.join (K snd) (type_constructor1, type_constructor2))
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    (Symtab.join (K snd) (type_class1, type_class2))
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    (Symreltab.join (K snd) (class_instance1, class_instance2))
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    (Symtab.join (K snd) (module1, module2)); (*prefer later entries: K snd*)
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fun lookup_constant_data x = (Symtab.lookup o #constant o dest_symbol_data) x;
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fun lookup_type_constructor_data x = (Symtab.lookup o #type_constructor o dest_symbol_data) x;
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fun lookup_type_class_data x = (Symtab.lookup o #type_class o dest_symbol_data) x;
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fun lookup_class_instance_data x = (Symreltab.lookup o #class_instance o dest_symbol_data) x;
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fun lookup_module_data x = (Symtab.lookup o #module o dest_symbol_data) x;
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fun dest_constant_data x = (Symtab.dest o #constant o dest_symbol_data) x;
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fun dest_type_constructor_data x = (Symtab.dest o #type_constructor o dest_symbol_data) x;
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fun dest_type_class_data x = (Symtab.dest o #type_class o dest_symbol_data) x;
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fun dest_class_instance_data x = (Symreltab.dest o #class_instance o dest_symbol_data) x;
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fun dest_module_data x = (Symtab.dest o #module o dest_symbol_data) x;
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   364
fun set_sym (sym, NONE) = Symtab.delete_safe sym
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  | set_sym (sym, SOME y) = Symtab.update (sym, y);
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fun set_symrel (symrel, NONE) = Symreltab.delete_safe symrel
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  | set_symrel (symrel, SOME y) = Symreltab.update (symrel, y);
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   369
fun set_symbol_data (Constant x) = map_symbol_data (set_sym x) I I I I
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  | set_symbol_data (Type_Constructor x) = map_symbol_data I (set_sym x) I I I
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  | set_symbol_data (Type_Class x) = map_symbol_data I I (set_sym x) I I
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  | set_symbol_data (Class_Instance x) = map_symbol_data I I I (set_symrel x) I
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  | set_symbol_data (Module x) = map_symbol_data I I I I (set_sym x);
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   375
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   376
(* generic syntax *)
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   377
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   378
type simple_const_syntax = int * ((fixity -> iterm -> Pretty.T)
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  -> fixity -> (iterm * itype) list -> Pretty.T);
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   380
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   381
type complex_const_syntax = int * (string list * (literals -> string list
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  -> (var_ctxt -> fixity -> iterm -> Pretty.T)
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    -> thm option -> var_ctxt -> fixity -> (iterm * itype) list -> Pretty.T));
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   384
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   385
datatype const_syntax = plain_const_syntax of string
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  | complex_const_syntax of complex_const_syntax;
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   387
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   388
fun requires_args (plain_const_syntax _) = 0
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  | requires_args (complex_const_syntax (k, _)) = k;
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   390
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   391
fun simple_const_syntax syn =
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  complex_const_syntax
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    (apsnd (fn f => ([], (fn _ => fn _ => fn print => fn _ => fn vars => f (print vars)))) syn);
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   394
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   395
type activated_complex_const_syntax = int * ((var_ctxt -> fixity -> iterm -> Pretty.T)
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  -> thm option -> var_ctxt -> fixity -> (iterm * itype) list -> Pretty.T)
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   397
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   398
datatype activated_const_syntax = Plain_const_syntax of int * string
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  | Complex_const_syntax of activated_complex_const_syntax;
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   400
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   401
fun activate_const_syntax thy literals c (plain_const_syntax s) naming =
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      (Plain_const_syntax (Code.args_number thy c, s), naming)
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   403
  | activate_const_syntax thy literals c (complex_const_syntax (n, (cs, f))) naming =
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   404
      fold_map (Code_Thingol.ensure_declared_const thy) cs naming
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   405
      |-> (fn cs' => pair (Complex_const_syntax (n, f literals cs')));
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   406
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   407
fun gen_print_app print_app_expr print_term const_syntax some_thm vars fxy
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   408
    (app as ({ name = c, dom, ... }, ts)) =
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   409
  case const_syntax c of
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   410
    NONE => brackify fxy (print_app_expr some_thm vars app)
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   411
  | SOME (Plain_const_syntax (_, s)) =>
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   412
      brackify fxy (str s :: map (print_term some_thm vars BR) ts)
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   413
  | SOME (Complex_const_syntax (k, print)) =>
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   414
      let
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   415
        fun print' fxy ts =
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   416
          print (print_term some_thm) some_thm vars fxy (ts ~~ take k dom);
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   417
      in
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   418
        if k = length ts
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   419
        then print' fxy ts
haftmann@28060
   420
        else if k < length ts
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   421
        then case chop k ts of (ts1, ts2) =>
wenzelm@43947
   422
          brackify fxy (print' APP ts1 :: map (print_term some_thm vars BR) ts2)
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   423
        else print_term some_thm vars fxy (Code_Thingol.eta_expand k app)
wenzelm@43947
   424
      end;
haftmann@28060
   425
haftmann@33989
   426
fun gen_print_bind print_term thm (fxy : fixity) pat vars =
haftmann@28060
   427
  let
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   428
    val vs = Code_Thingol.fold_varnames (insert (op =)) pat [];
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   429
    val vars' = intro_vars vs vars;
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   430
  in (print_term thm vars' fxy pat, vars') end;
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   431
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   432
type tyco_syntax = int * ((fixity -> itype -> Pretty.T)
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   433
  -> fixity -> itype list -> Pretty.T);
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   434
haftmann@28060
   435
haftmann@28060
   436
(* mixfix syntax *)
haftmann@28060
   437
haftmann@28060
   438
datatype 'a mixfix =
haftmann@28060
   439
    Arg of fixity
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   440
  | String of string
haftmann@37881
   441
  | Break;
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   442
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   443
fun printer_of_mixfix prep_arg (fixity_this, mfx) =
haftmann@28060
   444
  let
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   445
    fun is_arg (Arg _) = true
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   446
      | is_arg _ = false;
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   447
    val i = (length o filter is_arg) mfx;
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   448
    fun fillin _ [] [] =
haftmann@28060
   449
          []
haftmann@33989
   450
      | fillin print (Arg fxy :: mfx) (a :: args) =
haftmann@33989
   451
          (print fxy o prep_arg) a :: fillin print mfx args
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   452
      | fillin print (String s :: mfx) args =
haftmann@37881
   453
          str s :: fillin print mfx args
haftmann@37881
   454
      | fillin print (Break :: mfx) args =
haftmann@37881
   455
          Pretty.brk 1 :: fillin print mfx args;
haftmann@28060
   456
  in
haftmann@33989
   457
    (i, fn print => fn fixity_ctxt => fn args =>
haftmann@33989
   458
      gen_brackify (fixity fixity_this fixity_ctxt) (fillin print mfx args))
haftmann@28060
   459
  end;
haftmann@28060
   460
haftmann@52069
   461
fun read_infix (fixity_this, i) s =
haftmann@28060
   462
  let
haftmann@52069
   463
    val l = case fixity_this of L => INFX (i, L) | _ => INFX (i, X);
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   464
    val r = case fixity_this of R => INFX (i, R) | _ => INFX (i, X);
haftmann@28060
   465
  in
haftmann@52069
   466
    (INFX (i, fixity_this), [Arg l, String " ", String s, Break, Arg r])
haftmann@28060
   467
  end;
haftmann@28060
   468
haftmann@52069
   469
fun read_mixfix s =
haftmann@28060
   470
  let
haftmann@28060
   471
    val sym_any = Scan.one Symbol.is_regular;
haftmann@52069
   472
    val parse = Scan.optional ($$ "!" >> K NOBR) BR -- Scan.repeat (
haftmann@28060
   473
         ($$ "(" -- $$ "_" -- $$ ")" >> K (Arg NOBR))
haftmann@28060
   474
      || ($$ "_" >> K (Arg BR))
haftmann@37881
   475
      || ($$ "/" |-- Scan.repeat ($$ " ") >> (K Break))
haftmann@28060
   476
      || (Scan.repeat1
haftmann@28060
   477
           (   $$ "'" |-- sym_any
haftmann@28060
   478
            || Scan.unless ($$ "_" || $$ "/" || $$ "(" |-- $$ "_" |-- $$ ")")
haftmann@37881
   479
                 sym_any) >> (String o implode)));
wenzelm@43947
   480
    fun err s (_, NONE) = (fn () => "malformed mixfix annotation: " ^ quote s)
wenzelm@43947
   481
      | err _ (_, SOME msg) = msg;
wenzelm@43947
   482
  in
wenzelm@43947
   483
    case Scan.finite Symbol.stopper parse (Symbol.explode s) of
haftmann@52069
   484
        (fixity_mixfix, []) => fixity_mixfix
haftmann@52069
   485
      | _ => Scan.!! (err s) Scan.fail ()
haftmann@28060
   486
  end;
haftmann@28060
   487
haftmann@52069
   488
val parse_fixity =
haftmann@52069
   489
  (@{keyword "infix"} >> K X) || (@{keyword "infixl"} >> K L) || (@{keyword "infixr"} >> K R)
haftmann@52069
   490
haftmann@52069
   491
val parse_mixfix  =
haftmann@52069
   492
  Parse.string >> read_mixfix
haftmann@52069
   493
  || parse_fixity -- Parse.nat -- Parse.string
haftmann@52069
   494
     >> (fn ((fixity, i), s) => read_infix (fixity, i) s);
haftmann@28060
   495
haftmann@52069
   496
fun syntax_of_mixfix of_plain of_printer prep_arg (BR, [String s]) = of_plain s
haftmann@52069
   497
  | syntax_of_mixfix of_plain of_printer prep_arg (fixity, mfx) =
haftmann@52069
   498
      of_printer (printer_of_mixfix prep_arg (fixity, mfx));
haftmann@37881
   499
haftmann@52069
   500
val parse_tyco_syntax =
haftmann@52069
   501
  parse_mixfix >> syntax_of_mixfix (fn s => (0, (K o K o K o str) s)) I I;
haftmann@52069
   502
haftmann@52069
   503
val parse_const_syntax =
haftmann@52069
   504
  parse_mixfix >> syntax_of_mixfix plain_const_syntax simple_const_syntax fst;
haftmann@37881
   505
haftmann@28060
   506
end; (*struct*)