src/Tools/Code/code_printer.ML
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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_positive_numeral: int -> string,
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        literal_alternative_numeral: int -> string,
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        literal_naive_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_positive_numeral: literals -> int -> string
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  val literal_alternative_numeral: literals -> int -> string
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  val literal_naive_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 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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  type tyco_syntax
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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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  val requires_args: const_syntax -> int
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  val parse_const_syntax: Token.T list -> const_syntax option * Token.T list
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  val parse_tyco_syntax: Token.T list -> tyco_syntax option * Token.T list
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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 = 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 = Pretty.mark (code_presentationN, [(stmt_nameN, name)]);
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fun filter_presentation presentation_names selected (XML.Elem ((name, attrs), xs)) =
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      implode (map (filter_presentation presentation_names
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        (selected orelse (name = code_presentationN
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          andalso member (op =) presentation_names (the (Properties.get attrs stmt_nameN))))) xs)
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  | filter_presentation presentation_names selected (XML.Text s) =
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      if selected then s else "";
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fun maps_string s f [] = ""
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  | maps_string s f (x :: xs) =
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      let
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        val s1 = f x;
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        val s2 = maps_string s f xs;
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      in if s1 = "" then s2
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        else if s2 = "" then s1
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        else s1 ^ s ^ s2
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      end;
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fun plain_text (XML.Elem (_, xs)) = implode (map plain_text xs)
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  | plain_text (XML.Text s) = s
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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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  #> (if null presentation_names then implode o map plain_text
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      else maps_string "\n\n" (filter_presentation presentation_names false))
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  #> suffix "\n";
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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') = Name.variants 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 = case Symtab.lookup namemap name
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 of 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 explode;
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val first_lower = implode o nth_map 0 Symbol.to_ascii_lower o 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 = Name.variant (map_filter I fished1) "x";
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    val fished2 = map_index (fillup_param x) fished1;
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    val (fished3, _) = Name.variants 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_positive_numeral: int -> string,
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  literal_alternative_numeral: int -> string,
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  literal_naive_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_positive_numeral = #literal_positive_numeral o dest_Literals;
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val literal_alternative_numeral = #literal_alternative_numeral o dest_Literals;
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val literal_naive_numeral = #literal_naive_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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  (if fixity (INFX infx) fxy_ctxt then enclose "(" ")" else Pretty.block)
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    ([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 applify opn cls f fxy_ctxt p [] = p
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  | applify opn cls f fxy_ctxt p ps =
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      (if (fixity BR fxy_ctxt) then enclose "(" ")" else Pretty.block)
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        (p @@ enum "," opn cls (map f ps));
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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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(* generic syntax *)
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type tyco_syntax = int * ((fixity -> itype -> Pretty.T)
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  -> fixity -> itype list -> Pretty.T);
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type simple_const_syntax = int * ((fixity -> iterm -> Pretty.T)
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  -> fixity -> (iterm * itype) list -> Pretty.T);
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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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datatype const_syntax = plain_const_syntax of string
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  | complex_const_syntax of complex_const_syntax;
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fun requires_args (plain_const_syntax _) = 0
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  | requires_args (complex_const_syntax (k, _)) = k;
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fun simple_const_syntax syn =
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  complex_const_syntax (apsnd (fn f => ([], (fn _ => fn _ => fn print => fn _ => fn vars => f (print vars)))) syn);
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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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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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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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  | activate_const_syntax thy literals c (complex_const_syntax (n, (cs, f))) naming =
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      fold_map (Code_Thingol.ensure_declared_const thy) cs naming
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      |-> (fn cs' => pair (Complex_const_syntax (n, f literals cs')));
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fun gen_print_app print_app_expr print_term const_syntax some_thm vars fxy (app as ((c, (_, function_typs)), ts)) =
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  case const_syntax c
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   of NONE => brackify fxy (print_app_expr some_thm vars app)
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    | SOME (Plain_const_syntax (_, s)) => brackify fxy (str s :: map (print_term some_thm vars BR) ts)
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    | SOME (Complex_const_syntax (k, print)) =>
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        let
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          fun print' fxy ts = print (print_term some_thm) some_thm vars fxy (ts ~~ take k function_typs);
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        in if k = length ts
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          then print' fxy ts
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        else if k < length ts
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          then case chop k ts of (ts1, ts2) =>
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            brackify fxy (print' APP ts1 :: map (print_term some_thm vars BR) ts2)
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          else print_term some_thm vars fxy (Code_Thingol.eta_expand k app)
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        end;
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fun gen_print_bind print_term thm (fxy : fixity) pat vars =
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  let
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    val vs = Code_Thingol.fold_varnames (insert (op =)) pat [];
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    val vars' = intro_vars vs vars;
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  in (print_term thm vars' fxy pat, vars') end;
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(* mixfix syntax *)
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datatype 'a mixfix =
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    Arg of fixity
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  | String of string
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  | Break;
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fun mk_mixfix prep_arg (fixity_this, mfx) =
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  let
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    fun is_arg (Arg _) = true
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      | is_arg _ = false;
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    val i = (length o filter is_arg) mfx;
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    fun fillin _ [] [] =
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          []
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      | fillin print (Arg fxy :: mfx) (a :: args) =
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          (print fxy o prep_arg) a :: fillin print mfx args
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      | fillin print (String s :: mfx) args =
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          str s :: fillin print mfx args
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      | fillin print (Break :: mfx) args =
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          Pretty.brk 1 :: fillin print mfx args;
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  in
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    (i, fn print => fn fixity_ctxt => fn args =>
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      gen_brackify (fixity fixity_this fixity_ctxt) (fillin print mfx args))
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  end;
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fun parse_infix prep_arg (x, i) s =
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  let
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    val l = case x of L => INFX (i, L) | _ => INFX (i, X);
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    val r = case x of R => INFX (i, R) | _ => INFX (i, X);
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  in
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    mk_mixfix prep_arg (INFX (i, x), [Arg l, String " ", String s, Break, Arg r])
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  end;
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fun parse_mixfix mk_plain mk_complex prep_arg s =
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  let
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    val sym_any = Scan.one Symbol.is_regular;
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    val parse = Scan.optional ($$ "!" >> K true) false -- Scan.repeat (
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         ($$ "(" -- $$ "_" -- $$ ")" >> K (Arg NOBR))
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      || ($$ "_" >> K (Arg BR))
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      || ($$ "/" |-- Scan.repeat ($$ " ") >> (K Break))
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      || (Scan.repeat1
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           (   $$ "'" |-- sym_any
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            || Scan.unless ($$ "_" || $$ "/" || $$ "(" |-- $$ "_" |-- $$ ")")
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                 sym_any) >> (String o implode)));
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  in case Scan.finite Symbol.stopper parse (Symbol.explode s)
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   of ((false, [String s]), []) => mk_plain s
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    | ((_, p as [_]), []) => mk_complex (mk_mixfix prep_arg (NOBR, p))
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    | ((b, p as _ :: _ :: _), []) => mk_complex (mk_mixfix prep_arg (if b then NOBR else BR, p))
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    | _ => Scan.!!
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        (the_default ("malformed mixfix annotation: " ^ quote s) o snd) Scan.fail ()
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  end;
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val (infixK, infixlK, infixrK) = ("infix", "infixl", "infixr");
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fun parse_syntax mk_plain mk_complex prep_arg =
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  Scan.option (
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      ((Parse.$$$ infixK >> K X)
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        || (Parse.$$$ infixlK >> K L)
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        || (Parse.$$$ infixrK >> K R))
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        -- Parse.nat -- Parse.string
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        >> (fn ((x, i), s) => mk_complex (parse_infix prep_arg (x, i) s))
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      || Parse.string >> (fn s => (parse_mixfix mk_plain mk_complex prep_arg s)));
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val _ = List.app Keyword.keyword [infixK, infixlK, infixrK];
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fun parse_tyco_syntax x = parse_syntax (fn s => (0, (K o K o K o str) s)) I I x;
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val parse_const_syntax = parse_syntax plain_const_syntax simple_const_syntax fst;
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end; (*struct*)