(* Title: Pure/Syntax/printer.ML
Author: Tobias Nipkow and Markus Wenzel, TU Muenchen
Pretty printing of asts, terms, types and print (ast) translation.
*)
signature BASIC_PRINTER =
sig
val show_brackets: bool Config.T
val show_types: bool Config.T
val show_sorts: bool Config.T
val show_markup: bool Config.T
val show_structs: bool Config.T
val show_question_marks: bool Config.T
val pretty_priority: int Config.T
end;
signature PRINTER =
sig
include BASIC_PRINTER
val show_markup_default: bool Unsynchronized.ref
val show_type_emphasis: bool Config.T
val type_emphasis: Proof.context -> typ -> bool
type prtabs
datatype assoc = No_Assoc | Left_Assoc | Right_Assoc
val get_prefix: prtabs -> Symtab.key -> string option
val get_binder: prtabs -> Symtab.key -> string option
val get_infix: prtabs -> string -> {assoc: assoc, delim: string, pri: int} option
val empty_prtabs: prtabs
val update_prtabs: string -> Syntax_Ext.xprod list -> prtabs -> prtabs
val remove_prtabs: string -> Syntax_Ext.xprod list -> prtabs -> prtabs
val merge_prtabs: prtabs -> prtabs -> prtabs
val pretty_term_ast: bool -> Proof.context -> prtabs ->
(string -> Proof.context -> Ast.ast list -> Ast.ast) ->
(string -> Ast.ast list -> Pretty.T option) ->
((string -> Markup.T list) * (string -> string)) ->
Ast.ast -> Pretty.T list
val pretty_typ_ast: Proof.context -> prtabs ->
(string -> Proof.context -> Ast.ast list -> Ast.ast) ->
(string -> Ast.ast list -> Pretty.T option) ->
((string -> Markup.T list) * (string -> string)) ->
Ast.ast -> Pretty.T list
end;
structure Printer: PRINTER =
struct
(** options for printing **)
val show_brackets = Config.declare_option_bool ("show_brackets", \<^here>);
val show_types = Config.declare_option_bool ("show_types", \<^here>);
val show_sorts = Config.declare_option_bool ("show_sorts", \<^here>);
val show_markup_default = Unsynchronized.ref false;
val show_markup = Config.declare_bool ("show_markup", \<^here>) (fn _ => ! show_markup_default);
val show_structs = Config.declare_bool ("show_structs", \<^here>) (K false);
val show_question_marks = Config.declare_option_bool ("show_question_marks", \<^here>);
val show_type_emphasis = Config.declare_bool ("show_type_emphasis", \<^here>) (K true);
fun type_emphasis ctxt T =
T <> dummyT andalso
(Config.get ctxt show_types orelse Config.get ctxt show_markup orelse
Config.get ctxt show_type_emphasis andalso not (is_Type T));
(** type prtabs **)
datatype symb =
Arg of int |
TypArg of int |
String of Markup.T list * string |
Break of int |
Block of Syntax_Ext.block * symb list;
type prtabs = (string * ((symb list * int * int) list) Symtab.table) list;
fun mode_tab (prtabs: prtabs) mode = the_default Symtab.empty (AList.lookup (op =) prtabs mode);
fun mode_tabs (prtabs: prtabs) modes = map_filter (AList.lookup (op =) prtabs) (modes @ [""]);
fun lookup_default prtabs = Symtab.lookup_list (mode_tab prtabs "");
(* approximative syntax *)
datatype assoc = No_Assoc | Left_Assoc | Right_Assoc;
local
fun is_arg (Arg _) = true
| is_arg (TypArg _) = true
| is_arg _ = false;
fun is_space str = forall_string (fn s => s = " ") str;
fun clean symbs = symbs |> maps
(fn Block (_, body) => clean body
| symb as String (_, s) => if is_space s then [] else [symb]
| symb => if is_arg symb then [symb] else []);
in
fun get_prefix prtabs c =
lookup_default prtabs c
|> get_first (fn (symbs, _, _) =>
(case clean symbs of
String (_, d) :: rest => if forall is_arg rest then SOME d else NONE
| _ => NONE));
fun get_binder prtabs c =
lookup_default prtabs (Mixfix.binder_name c)
|> get_first (fn (symbs, _, _) =>
(case clean symbs of
String (_, d) :: _ => SOME d
| _ => NONE));
fun get_infix prtabs c =
lookup_default prtabs c
|> map_filter (fn (symbs, _, p) =>
(case clean symbs of
[Arg p1, String (_, d), Arg p2] => SOME (p1, p2, d, p)
| [TypArg p1, String (_, d), TypArg p2] => SOME (p1, p2, d, p)
| _ => NONE))
|> get_first (fn (p1, p2, d, p) =>
if p1 = p + 1 andalso p2 = p + 1 then SOME {assoc = No_Assoc, delim = d, pri = p}
else if p1 = p andalso p2 = p + 1 then SOME {assoc = Left_Assoc, delim = d, pri = p}
else if p1 = p + 1 andalso p2 = p then SOME {assoc = Right_Assoc, delim = d, pri = p}
else NONE);
end;
(* xprod_to_fmt *)
fun make_string s = String ([], s);
fun make_literal s = String (Lexicon.literal_markup s, s);
fun make_arg (s, p) =
(if s = "type" then TypArg else Arg)
(if Lexicon.is_terminal s then 1000 else p);
fun xprod_to_fmt (Syntax_Ext.XProd (_, _, "", _)) = NONE
| xprod_to_fmt (Syntax_Ext.XProd (_, xsymbs, const, pri)) =
let
fun make_symbs (Syntax_Ext.Delim s :: xsyms) = make_symbs xsyms |>> cons (make_literal s)
| make_symbs (Syntax_Ext.Argument a :: xsyms) = make_symbs xsyms |>> cons (make_arg a)
| make_symbs (Syntax_Ext.Space s :: xsyms) = make_symbs xsyms |>> cons (make_string s)
| make_symbs (Syntax_Ext.Bg block :: xsyms) =
let
val (bsyms, xsyms') = make_symbs xsyms;
val (syms, xsyms'') = make_symbs xsyms';
in (Block (block, bsyms) :: syms, xsyms'') end
| make_symbs (Syntax_Ext.Brk i :: xsyms) = make_symbs xsyms |>> cons (Break i)
| make_symbs (Syntax_Ext.En :: xsyms) = ([], xsyms)
| make_symbs [] = ([], []);
fun count_args (Arg _ :: syms) = Integer.add 1 #> count_args syms
| count_args (TypArg _ :: syms) = Integer.add 1 #> count_args syms
| count_args (String _ :: syms) = count_args syms
| count_args (Break _ :: syms) = count_args syms
| count_args (Block (_, bsyms) :: syms) = count_args syms #> count_args bsyms
| count_args [] = I;
in
(case make_symbs xsymbs of
(symbs, []) => SOME (const, (symbs, count_args symbs 0, pri))
| _ => raise Fail "Unbalanced pretty-printing blocks")
end;
(* empty, extend, merge prtabs *)
val empty_prtabs = [];
fun update_prtabs mode xprods prtabs =
let
val fmts = map_filter xprod_to_fmt xprods;
val tab' = fold (Symtab.update_list (op =)) fmts (mode_tab prtabs mode);
in AList.update (op =) (mode, tab') prtabs end;
fun remove_prtabs mode xprods prtabs =
let
val tab = mode_tab prtabs mode;
val fmts = map_filter (fn xprod as Syntax_Ext.XProd (_, _, c, _) =>
if null (Symtab.lookup_list tab c) then NONE
else xprod_to_fmt xprod) xprods;
val tab' = fold (Symtab.remove_list (op =)) fmts tab;
in AList.update (op =) (mode, tab') prtabs end;
fun merge_prtabs prtabs1 prtabs2 =
let
val modes = distinct (op =) (map fst (prtabs1 @ prtabs2));
fun merge m = (m, Symtab.merge_list (op =) (mode_tab prtabs1 m, mode_tab prtabs2 m));
in map merge modes end;
(** pretty term or typ asts **)
fun is_chain [Block (_, pr)] = is_chain pr
| is_chain [Arg _] = true
| is_chain _ = false;
val pretty_type_mode = Config.declare_bool ("Syntax.pretty_type_mode", \<^here>) (K false);
val pretty_curried = Config.declare_bool ("Syntax.pretty_curried", \<^here>) (K false);
val pretty_priority = Config.declare_int ("Syntax.pretty_priority", \<^here>) (K 0);
local
val par_block = Syntax_Ext.block_indent 1;
val par_bg = make_literal "(";
val par_en = make_literal ")";
in
fun pretty ctxt tabs trf markup_trans markup_extern ast0 =
let
val type_mode = Config.get ctxt pretty_type_mode;
val curried = Config.get ctxt pretty_curried;
val show_brackets = Config.get ctxt show_brackets;
(*default applications: prefix / postfix*)
val appT =
if type_mode then Syntax_Trans.tappl_ast_tr'
else if curried then Syntax_Trans.applC_ast_tr'
else Syntax_Trans.appl_ast_tr';
fun synT _ ([], args) = ([], args)
| synT m (Arg p :: symbs, t :: args) =
let val (Ts, args') = synT m (symbs, args);
in (astT (t, p) @ Ts, args') end
| synT m (TypArg p :: symbs, t :: args) =
let
val (Ts, args') = synT m (symbs, args);
in
if type_mode then (astT (t, p) @ Ts, args')
else
let val ctxt' = ctxt
|> Config.put pretty_type_mode true
|> Config.put pretty_priority p
in (pretty ctxt' tabs trf markup_trans markup_extern t @ Ts, args') end
end
| synT m (String (literal_markup, s) :: symbs, args) =
let
val (Ts, args') = synT m (symbs, args);
val T = Pretty.marks_str (if null literal_markup then [] else m @ literal_markup, s);
in (T :: Ts, args') end
| synT m (Block (block, bsymbs) :: symbs, args) =
let
val {markup, open_block, consistent, unbreakable, indent} = block;
val (bTs, args') = synT m (bsymbs, args);
val (Ts, args'') = synT m (symbs, args');
val prt_block =
{markup = markup, open_block = open_block, consistent = consistent, indent = indent};
val T = Pretty.markup_blocks prt_block bTs |> unbreakable ? Pretty.unbreakable;
in (T :: Ts, args'') end
| synT m (Break i :: symbs, args) =
let
val (Ts, args') = synT m (symbs, args);
val T = if i < 0 then Pretty.fbrk else Pretty.brk i;
in (T :: Ts, args') end
and parT m (pr, args, p, p') = #1 (synT m
(if p > p' orelse (show_brackets andalso p' <> 1000 andalso not (is_chain pr))
then [Block (par_block, par_bg :: pr @ [par_en])] else pr, args))
and atomT a = Pretty.marks_str (#1 markup_extern a, #2 markup_extern a)
and splitT 0 ([x], ys) = (x, ys)
| splitT 0 (rev_xs, ys) = (Ast.Appl (rev rev_xs), ys)
| splitT n (rev_xs, y :: ys) = splitT (n - 1) (y :: rev_xs, ys)
and transT a args p =
(case markup_trans a args of
SOME prt => SOME [prt]
| NONE => Option.map astT (SOME (trf a ctxt args, p) handle Match => NONE))
and combT c a args p =
(case transT a args p of
SOME res => res
| NONE =>
(*find matching table entry, or print as prefix / postfix*)
let
val nargs = length args;
val entry =
tabs |> get_first (fn tab =>
Symtab.lookup_list tab a |> find_first (fn (_, n, _) =>
nargs = n orelse nargs > n andalso not type_mode));
in
(case entry of
NONE =>
if nargs = 0 then [atomT a]
else astT (appT (c, args), p)
| SOME (pr, n, p') =>
if nargs = n then parT (#1 markup_extern a) (pr, args, p, p')
else astT (appT (splitT n ([c], args)), p))
end)
and astT (Ast.Variable x, _) = [Ast.pretty_var x]
| astT (c as Ast.Constant a, p) = combT c a [] p
| astT (Ast.Appl ((c as Ast.Constant a) :: (args as _ :: _)), p) = combT c a args p
| astT (Ast.Appl (f :: (args as _ :: _)), p) = astT (appT (f, args), p)
| astT (ast as Ast.Appl _, _) = raise Ast.AST ("pretty: malformed ast", [ast]);
in astT (ast0, Config.get ctxt pretty_priority) end;
end;
(* pretty_term_ast *)
fun pretty_term_ast curried ctxt prtabs trf markup_trans markup_extern ast =
let val ctxt' = ctxt
|> Config.put pretty_type_mode false
|> Config.put pretty_curried curried
in pretty ctxt' (mode_tabs prtabs (print_mode_value ())) trf markup_trans markup_extern ast end;
(* pretty_typ_ast *)
fun pretty_typ_ast ctxt prtabs trf markup_trans markup_extern ast =
let val ctxt' = ctxt
|> Config.put pretty_type_mode true
|> Config.put pretty_curried false
in pretty ctxt' (mode_tabs prtabs (print_mode_value ())) trf markup_trans markup_extern ast end;
end;
structure Basic_Printer: BASIC_PRINTER = Printer;
open Basic_Printer;