src/Pure/Syntax/syntax.ML
author wenzelm
Sun Apr 17 19:39:11 2005 +0200 (2005-04-17)
changeset 15759 144c9f9a8ade
parent 15755 50ac97ebe7d8
child 15833 78109c7012ed
permissions -rw-r--r--
tuned;
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(*  Title:      Pure/Syntax/syntax.ML
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    ID:         $Id$
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    Author:     Tobias Nipkow and Markus Wenzel, TU Muenchen
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Root of Isabelle's syntax module.
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*)
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signature BASIC_SYNTAX =
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sig
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  include AST0
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  include SYN_TRANS0
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  include MIXFIX0
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  include PRINTER0
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end;
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signature SYNTAX =
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sig
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  include TOKEN_TRANS0
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  include AST1
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  include LEXICON0
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  include SYN_EXT0
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  include TYPE_EXT0
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  include SYN_TRANS1
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  include MIXFIX1
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  include PRINTER0
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  val extend_trtab: string -> (string * ('a * stamp)) list ->
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    ('a * stamp) Symtab.table -> ('a * stamp) Symtab.table
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  val merge_trtabs: string -> ('a * stamp) Symtab.table -> ('a * stamp) Symtab.table ->
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    ('a * stamp) Symtab.table
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  val merge_tr'tabs: ('a * stamp) list Symtab.table -> ('a * stamp) list Symtab.table
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    -> ('a * stamp) list Symtab.table
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  val extend_tr'tab: (string * ('a * stamp)) list ->
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    ('a * stamp) list Symtab.table -> ('a * stamp) list Symtab.table
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  datatype 'a trrule =
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    ParseRule of 'a * 'a |
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    PrintRule of 'a * 'a |
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    ParsePrintRule of 'a * 'a
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  type syntax
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  val is_keyword: syntax -> string -> bool
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  val default_mode: string * bool
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  val extend_type_gram: (string * int * mixfix) list -> syntax -> syntax
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  val extend_const_gram: (string -> bool) ->
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    string * bool -> (string * typ * mixfix) list -> syntax -> syntax
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  val extend_consts: string list -> syntax -> syntax
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  val extend_trfuns:
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    (string * ((ast list -> ast) * stamp)) list *
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    (string * ((term list -> term) * stamp)) list *
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    (string * ((bool -> typ -> term list -> term) * stamp)) list *
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    (string * ((ast list -> ast) * stamp)) list -> syntax -> syntax
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  val extend_tokentrfuns: (string * string * (string -> string * real)) list -> syntax -> syntax
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  val extend_trrules_i: ast trrule list -> syntax -> syntax
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  val extend_trrules: (string -> bool) -> syntax ->
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    (string * string) trrule list -> syntax -> syntax
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  val remove_const_gram: (string -> bool) ->
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    string * bool -> (string * typ * mixfix) list -> syntax -> syntax
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  val map_trrule: ('a -> 'b) -> 'a trrule -> 'b trrule
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  val merge_syntaxes: syntax -> syntax -> syntax
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  val type_syn: syntax
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  val pure_syn: syntax
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  val print_gram: syntax -> unit
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  val print_trans: syntax -> unit
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  val print_syntax: syntax -> unit
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  val read: (string -> bool) -> syntax -> typ -> string -> term list
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  val read_typ: syntax -> ((indexname * sort) list -> indexname -> sort) -> (sort -> sort) ->
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    string -> typ
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  val read_sort: syntax -> string -> sort
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  val pretty_term: syntax -> bool -> term -> Pretty.T
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  val pretty_typ: syntax -> typ -> Pretty.T
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  val pretty_sort: syntax -> sort -> Pretty.T
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  val simple_pprint_typ: typ -> pprint_args -> unit
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  val ambiguity_level: int ref
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  val ambiguity_is_error: bool ref
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end;
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structure Syntax: SYNTAX =
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struct
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(** tables of translation functions **)
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(* parse (ast) translations *)
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fun lookup_tr tab c = Option.map fst (Symtab.lookup (tab, c));
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fun err_dup_trfuns name cs =
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  error ("More than one " ^ name ^ " for " ^ commas_quote cs);
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fun extend_trtab name trfuns tab = Symtab.extend (tab, trfuns)
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  handle Symtab.DUPS cs => err_dup_trfuns name cs;
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fun remove_trtab trfuns = fold (Symtab.remove SynExt.eq_trfun) trfuns;
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fun merge_trtabs name tab1 tab2 = Symtab.merge SynExt.eq_trfun (tab1, tab2)
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  handle Symtab.DUPS cs => err_dup_trfuns name cs;
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(* print (ast) translations *)
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fun lookup_tr' tab c = map fst (Symtab.lookup_multi (tab, c));
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fun extend_tr'tab trfuns = fold_rev (curry Symtab.update_multi) trfuns;
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fun remove_tr'tab trfuns = fold (Symtab.remove_multi SynExt.eq_trfun) trfuns;
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fun merge_tr'tabs tab1 tab2 = Symtab.merge_multi' SynExt.eq_trfun (tab1, tab2);
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(** tables of token translation functions **)
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fun lookup_tokentr tabs modes =
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  let val trs = gen_distinct eq_fst (List.concat (map (assocs tabs) (modes @ [""])))
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  in fn c => Option.map fst (assoc (trs, c)) end;
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fun merge_tokentrtabs tabs1 tabs2 =
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  let
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    fun eq_tr ((c1, (_, s1)), (c2, (_, s2))) = c1 = c2 andalso s1 = s2;
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    fun name (s, _) = implode (tl (Symbol.explode s));
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    fun merge mode =
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      let
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        val trs1 = assocs tabs1 mode;
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        val trs2 = assocs tabs2 mode;
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        val trs = gen_distinct eq_tr (trs1 @ trs2);
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      in
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        (case gen_duplicates eq_fst trs of
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          [] => (mode, trs)
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        | dups => error ("More than one token translation function in mode " ^
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            quote mode ^ " for " ^ commas_quote (map name dups)))
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      end;
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  in
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    map merge (distinct (map fst (tabs1 @ tabs2)))
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  end;
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fun extend_tokentrtab tokentrs tabs =
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  let
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    fun ins_tokentr (m, c, f) ts =
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      overwrite (ts, (m, ("_" ^ c, (f, stamp ())) :: assocs ts m));
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  in merge_tokentrtabs tabs (fold ins_tokentr tokentrs []) end;
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(** tables of translation rules **)
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type ruletab = (Ast.ast * Ast.ast) list Symtab.table;
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fun dest_ruletab tab = List.concat (map snd (Symtab.dest tab));
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fun lookup_ruletab tab a = Symtab.lookup_multi (tab, a);
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(* empty, extend, merge ruletabs *)
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val extend_ruletab =
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  fold_rev (fn r => fn tab => Symtab.update_multi ((Ast.head_of_rule r, r), tab));
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val remove_ruletab = fold (fn r => Symtab.remove_multi (op =) (Ast.head_of_rule r, r));
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fun merge_ruletabs tab1 tab2 = Symtab.merge_multi' (op =) (tab1, tab2);
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(** datatype syntax **)
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datatype syntax =
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  Syntax of {
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    input: SynExt.xprod list,
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    lexicon: Scan.lexicon,
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    gram: Parser.gram,
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    consts: string list,
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    prmodes: string list,
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    parse_ast_trtab: ((Ast.ast list -> Ast.ast) * stamp) Symtab.table,
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    parse_ruletab: ruletab,
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    parse_trtab: ((term list -> term) * stamp) Symtab.table,
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    print_trtab: ((bool -> typ -> term list -> term) * stamp) list Symtab.table,
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    print_ruletab: ruletab,
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    print_ast_trtab: ((Ast.ast list -> Ast.ast) * stamp) list Symtab.table,
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    tokentrtab: (string * (string * ((string -> string * real) * stamp)) list) list,
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    prtabs: Printer.prtabs}
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fun is_keyword (Syntax {lexicon, ...}) = Scan.is_literal lexicon o Symbol.explode;
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val default_mode = ("", true);
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(* empty_syntax *)
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val empty_syntax =
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  Syntax {
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    input = [],
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    lexicon = Scan.empty_lexicon,
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    gram = Parser.empty_gram,
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    consts = [],
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    prmodes = [],
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    parse_ast_trtab = Symtab.empty,
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    parse_ruletab = Symtab.empty,
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    parse_trtab = Symtab.empty,
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    print_trtab = Symtab.empty,
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    print_ruletab = Symtab.empty,
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    print_ast_trtab = Symtab.empty,
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    tokentrtab = [],
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    prtabs = Printer.empty_prtabs};
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(* extend_syntax *)
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fun extend_syntax (mode, inout) syn_ext (Syntax tabs) =
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  let
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    val {input, lexicon, gram, consts = consts1, prmodes = prmodes1,
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      parse_ast_trtab, parse_ruletab, parse_trtab, print_trtab, print_ruletab,
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      print_ast_trtab, tokentrtab, prtabs} = tabs;
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    val SynExt.SynExt {xprods, consts = consts2, prmodes = prmodes2,
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      parse_ast_translation, parse_rules, parse_translation, print_translation, print_rules,
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      print_ast_translation, token_translation} = syn_ext;
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  in
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    Syntax {
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      input = if inout then xprods @ input else input,
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      lexicon = if inout then Scan.extend_lexicon lexicon (SynExt.delims_of xprods) else lexicon,
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      gram = if inout then Parser.extend_gram gram xprods else gram,
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      consts = merge_lists' consts1 consts2,
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      prmodes = mode ins_string (merge_lists' prmodes1 prmodes2),
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      parse_ast_trtab =
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        extend_trtab "parse ast translation" parse_ast_translation parse_ast_trtab,
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      parse_ruletab = extend_ruletab parse_rules parse_ruletab,
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      parse_trtab = extend_trtab "parse translation" parse_translation parse_trtab,
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      print_trtab = extend_tr'tab print_translation print_trtab,
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      print_ruletab = extend_ruletab print_rules print_ruletab,
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      print_ast_trtab = extend_tr'tab print_ast_translation print_ast_trtab,
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      tokentrtab = extend_tokentrtab token_translation tokentrtab,
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      prtabs = Printer.extend_prtabs mode xprods prtabs}
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  end;
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(* remove_syntax *)
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fun remove_syntax (mode, inout) syn_ext (Syntax tabs) =
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  let
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    val SynExt.SynExt {xprods, consts = _, prmodes = _,
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      parse_ast_translation, parse_rules, parse_translation, print_translation, print_rules,
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      print_ast_translation, token_translation = _} = syn_ext;
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    val {input, lexicon, gram, consts, prmodes,
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      parse_ast_trtab, parse_ruletab, parse_trtab, print_trtab, print_ruletab,
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      print_ast_trtab, tokentrtab, prtabs} = tabs;
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    val input' = if inout then fold (remove (op =)) xprods input else input;
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  in
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    Syntax {
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      input = input',
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      lexicon = if inout then Scan.make_lexicon (SynExt.delims_of input') else lexicon,
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      gram = if inout then Parser.make_gram input' else gram,
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      consts = consts,
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      prmodes = prmodes,
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      parse_ast_trtab = remove_trtab parse_ast_translation parse_ast_trtab,
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      parse_ruletab = remove_ruletab parse_rules parse_ruletab,
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      parse_trtab = remove_trtab parse_translation parse_trtab,
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      print_trtab = remove_tr'tab print_translation print_trtab,
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      print_ruletab = remove_ruletab print_rules print_ruletab,
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      print_ast_trtab = remove_tr'tab print_ast_translation print_ast_trtab,
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      tokentrtab = tokentrtab,
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      prtabs = Printer.remove_prtabs mode xprods prtabs}
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  end;
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(* merge_syntaxes *)
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fun merge_syntaxes (Syntax tabs1) (Syntax tabs2) =
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  let
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    val {input = input1, lexicon = lexicon1, gram = gram1, consts = consts1,
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      prmodes = prmodes1, parse_ast_trtab = parse_ast_trtab1,
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      parse_ruletab = parse_ruletab1, parse_trtab = parse_trtab1,
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      print_trtab = print_trtab1, print_ruletab = print_ruletab1,
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      print_ast_trtab = print_ast_trtab1, tokentrtab = tokentrtab1, prtabs = prtabs1} = tabs1;
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    val {input = input2, lexicon = lexicon2, gram = gram2, consts = consts2,
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      prmodes = prmodes2, parse_ast_trtab = parse_ast_trtab2,
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      parse_ruletab = parse_ruletab2, parse_trtab = parse_trtab2,
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      print_trtab = print_trtab2, print_ruletab = print_ruletab2,
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      print_ast_trtab = print_ast_trtab2, tokentrtab = tokentrtab2, prtabs = prtabs2} = tabs2;
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  in
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    Syntax {
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      input = merge_lists' input1 input2,
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      lexicon = Scan.merge_lexicons lexicon1 lexicon2,
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      gram = Parser.merge_grams gram1 gram2,
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      consts = unique_strings (sort_strings (consts1 @ consts2)),
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      prmodes = merge_lists prmodes1 prmodes2,
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      parse_ast_trtab =
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        merge_trtabs "parse ast translation" parse_ast_trtab1 parse_ast_trtab2,
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      parse_ruletab = merge_ruletabs parse_ruletab1 parse_ruletab2,
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      parse_trtab = merge_trtabs "parse translation" parse_trtab1 parse_trtab2,
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      print_trtab = merge_tr'tabs print_trtab1 print_trtab2,
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      print_ruletab = merge_ruletabs print_ruletab1 print_ruletab2,
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      print_ast_trtab = merge_tr'tabs print_ast_trtab1 print_ast_trtab2,
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      tokentrtab = merge_tokentrtabs tokentrtab1 tokentrtab2,
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      prtabs = Printer.merge_prtabs prtabs1 prtabs2}
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  end;
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(* type_syn *)
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val type_syn = empty_syntax |> extend_syntax default_mode TypeExt.type_ext;
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val pure_syn = type_syn |> extend_syntax default_mode SynExt.pure_ext;
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(** print syntax **)
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local
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fun pretty_strs_qs name strs =
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  Pretty.strs (name :: map Library.quote (sort_strings strs));
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fun pretty_gram (Syntax tabs) =
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  let
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    val {lexicon, prmodes, gram, prtabs, ...} = tabs;
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    val prmodes' = sort_strings (filter_out (equal "") prmodes);
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  in
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    [pretty_strs_qs "lexicon:" (Scan.dest_lexicon lexicon),
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      Pretty.big_list "prods:" (Parser.pretty_gram gram),
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      pretty_strs_qs "print modes:" prmodes']
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  end;
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fun pretty_trans (Syntax tabs) =
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  let
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    fun pretty_trtab name tab =
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      pretty_strs_qs name (Symtab.keys tab);
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    fun pretty_ruletab name tab =
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      Pretty.big_list name (map Ast.pretty_rule (dest_ruletab tab));
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    fun pretty_tokentr (mode, trs) = Pretty.strs (Library.quote mode ^ ":" :: map fst trs);
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    val {consts, parse_ast_trtab, parse_ruletab, parse_trtab, print_trtab,
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      print_ruletab, print_ast_trtab, tokentrtab, ...} = tabs;
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  in
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    [pretty_strs_qs "consts:" consts,
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      pretty_trtab "parse_ast_translation:" parse_ast_trtab,
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      pretty_ruletab "parse_rules:" parse_ruletab,
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      pretty_trtab "parse_translation:" parse_trtab,
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      pretty_trtab "print_translation:" print_trtab,
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      pretty_ruletab "print_rules:" print_ruletab,
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      pretty_trtab "print_ast_translation:" print_ast_trtab,
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      Pretty.big_list "token_translation:" (map pretty_tokentr tokentrtab)]
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  end;
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in
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fun print_gram syn = Pretty.writeln (Pretty.chunks (pretty_gram syn));
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fun print_trans syn = Pretty.writeln (Pretty.chunks (pretty_trans syn));
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fun print_syntax syn = Pretty.writeln (Pretty.chunks (pretty_gram syn @ pretty_trans syn));
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end;
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(** read **)
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(* read_ast *)
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val ambiguity_level = ref 1;
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val ambiguity_is_error = ref false
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fun read_asts is_logtype (Syntax tabs) xids root str =
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  let
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    val {lexicon, gram, parse_ast_trtab, ...} = tabs;
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    val root' = if root <> "prop" andalso is_logtype root then SynExt.logic else root;
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    val chars = Symbol.explode str;
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    val pts = Parser.parse gram root' (Lexicon.tokenize lexicon xids chars);
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    fun show_pt pt =
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      warning (Pretty.string_of (Ast.pretty_ast (hd (SynTrans.pts_to_asts (K NONE) [pt]))));
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  in
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    if length pts > ! ambiguity_level then
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        if ! ambiguity_is_error then
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            error ("Ambiguous input " ^ quote str)
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        else
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            (warning ("Ambiguous input " ^ quote str);
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             warning "produces the following parse trees:";
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             List.app show_pt pts)
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    else ();
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    SynTrans.pts_to_asts (lookup_tr parse_ast_trtab) pts
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  end;
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   378
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   379
(* read *)
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   380
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fun read is_logtype (syn as Syntax tabs) ty str =
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   382
  let
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    val {parse_ruletab, parse_trtab, ...} = tabs;
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    val asts = read_asts is_logtype syn false (SynExt.typ_to_nonterm ty) str;
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  in
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    SynTrans.asts_to_terms (lookup_tr parse_trtab)
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      (map (Ast.normalize_ast (lookup_ruletab parse_ruletab)) asts)
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   388
  end;
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   390
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   391
(* read types *)
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   392
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   393
fun read_typ syn get_sort map_sort str =
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  (case read (K false) syn SynExt.typeT str of
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   395
    [t] => TypeExt.typ_of_term (get_sort (TypeExt.raw_term_sorts t)) map_sort t
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   396
  | _ => error "read_typ: ambiguous syntax");
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   397
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   398
wenzelm@8894
   399
(* read sorts *)
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   400
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   401
fun read_sort syn str =
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   402
  (case read (K false) syn TypeExt.sortT str of
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   403
    [t] => TypeExt.sort_of_term t
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   404
  | _ => error "read_sort: ambiguous syntax");
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   405
wenzelm@8894
   406
wenzelm@18
   407
wenzelm@1158
   408
(** prepare translation rules **)
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   409
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   410
datatype 'a trrule =
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   411
  ParseRule of 'a * 'a |
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  PrintRule of 'a * 'a |
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   413
  ParsePrintRule of 'a * 'a;
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   414
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   415
fun map_trrule f (ParseRule (x, y)) = ParseRule (f x, f y)
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   416
  | map_trrule f (PrintRule (x, y)) = PrintRule (f x, f y)
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   417
  | map_trrule f (ParsePrintRule (x, y)) = ParsePrintRule (f x, f y);
wenzelm@1158
   418
skalberg@15531
   419
fun parse_rule (ParseRule pats) = SOME pats
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   420
  | parse_rule (PrintRule _) = NONE
skalberg@15531
   421
  | parse_rule (ParsePrintRule pats) = SOME pats;
wenzelm@1158
   422
skalberg@15531
   423
fun print_rule (ParseRule _) = NONE
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   424
  | print_rule (PrintRule pats) = SOME (swap pats)
skalberg@15531
   425
  | print_rule (ParsePrintRule pats) = SOME (swap pats);
wenzelm@1158
   426
wenzelm@1158
   427
wenzelm@1158
   428
fun check_rule (rule as (lhs, rhs)) =
wenzelm@5692
   429
  (case Ast.rule_error rule of
skalberg@15531
   430
    SOME msg =>
wenzelm@1158
   431
      error ("Error in syntax translation rule: " ^ msg ^ "\n" ^
wenzelm@5692
   432
        Ast.str_of_ast lhs ^ "  ->  " ^ Ast.str_of_ast rhs)
skalberg@15531
   433
  | NONE => rule);
wenzelm@888
   434
wenzelm@888
   435
wenzelm@14904
   436
fun read_pattern is_logtype syn (root, str) =
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   437
  let
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   438
    val Syntax {consts, ...} = syn;
wenzelm@18
   439
wenzelm@5692
   440
    fun constify (ast as Ast.Constant _) = ast
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   441
      | constify (ast as Ast.Variable x) =
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   442
          if x mem consts orelse NameSpace.is_qualified x then Ast.Constant x
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   443
          else ast
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   444
      | constify (Ast.Appl asts) = Ast.Appl (map constify asts);
wenzelm@18
   445
  in
wenzelm@14904
   446
    (case read_asts is_logtype syn true root str of
wenzelm@888
   447
      [ast] => constify ast
wenzelm@888
   448
    | _ => error ("Syntactically ambiguous input: " ^ quote str))
wenzelm@888
   449
  end handle ERROR =>
wenzelm@888
   450
    error ("The error(s) above occurred in translation pattern " ^
wenzelm@888
   451
      quote str);
clasohm@0
   452
wenzelm@556
   453
wenzelm@1158
   454
fun prep_rules rd_pat raw_rules =
wenzelm@4618
   455
  let val rules = map (map_trrule rd_pat) raw_rules in
skalberg@15570
   456
    (map check_rule (List.mapPartial parse_rule rules),
skalberg@15570
   457
      map check_rule (List.mapPartial print_rule rules))
wenzelm@1158
   458
  end
wenzelm@18
   459
wenzelm@18
   460
wenzelm@18
   461
wenzelm@3779
   462
(** pretty terms, typs, sorts **)
wenzelm@18
   463
wenzelm@3779
   464
fun pretty_t t_to_ast prt_t (syn as Syntax tabs) curried t =
clasohm@0
   465
  let
wenzelm@2700
   466
    val {print_trtab, print_ruletab, print_ast_trtab, tokentrtab, prtabs, ...} = tabs;
wenzelm@5692
   467
    val ast = t_to_ast (lookup_tr' print_trtab) t;
clasohm@0
   468
  in
wenzelm@5692
   469
    prt_t curried prtabs (lookup_tr' print_ast_trtab)
oheimb@6167
   470
      (lookup_tokentr tokentrtab (! print_mode))
wenzelm@5692
   471
      (Ast.normalize_ast (lookup_ruletab print_ruletab) ast)
clasohm@0
   472
  end;
clasohm@0
   473
wenzelm@5692
   474
val pretty_term = pretty_t Printer.term_to_ast Printer.pretty_term_ast;
wenzelm@5692
   475
fun pretty_typ syn = pretty_t Printer.typ_to_ast Printer.pretty_typ_ast syn false;
wenzelm@5692
   476
fun pretty_sort syn = pretty_t Printer.sort_to_ast Printer.pretty_typ_ast syn false;
clasohm@0
   477
wenzelm@260
   478
val simple_pprint_typ = Pretty.pprint o Pretty.quote o (pretty_typ type_syn);
clasohm@0
   479
clasohm@0
   480
clasohm@0
   481
wenzelm@14904
   482
(** extend syntax **)
wenzelm@383
   483
wenzelm@14904
   484
fun ext_syntax' f is_logtype prmode decls = extend_syntax prmode (f is_logtype decls);
wenzelm@14904
   485
fun ext_syntax f = ext_syntax' (K f) (K false) default_mode;
wenzelm@383
   486
wenzelm@14904
   487
val extend_type_gram   = ext_syntax Mixfix.syn_ext_types;
wenzelm@14904
   488
val extend_const_gram  = ext_syntax' Mixfix.syn_ext_consts;
wenzelm@14904
   489
val extend_consts      = ext_syntax SynExt.syn_ext_const_names;
wenzelm@14904
   490
val extend_trfuns      = ext_syntax SynExt.syn_ext_trfuns;
wenzelm@14904
   491
val extend_tokentrfuns = ext_syntax SynExt.syn_ext_tokentrfuns;
wenzelm@14904
   492
val extend_trrules_i   = ext_syntax SynExt.syn_ext_rules o prep_rules I;
wenzelm@383
   493
wenzelm@14904
   494
fun extend_trrules is_logtype syn rules =
wenzelm@14904
   495
  ext_syntax' (K SynExt.syn_ext_rules) (K false) default_mode
wenzelm@14904
   496
    (prep_rules (read_pattern is_logtype syn) rules);
wenzelm@5692
   497
wenzelm@15755
   498
fun remove_const_gram is_logtype prmode decls =
wenzelm@15755
   499
  remove_syntax prmode (Mixfix.syn_ext_consts is_logtype decls);
wenzelm@15755
   500
wenzelm@5692
   501
wenzelm@5692
   502
wenzelm@5692
   503
(** export parts of internal Syntax structures **)
wenzelm@5692
   504
wenzelm@6322
   505
open TokenTrans Lexicon SynExt Ast Parser TypeExt SynTrans Mixfix Printer;
wenzelm@2366
   506
clasohm@0
   507
end;
wenzelm@5692
   508
wenzelm@5692
   509
structure BasicSyntax: BASIC_SYNTAX = Syntax;
wenzelm@5692
   510
open BasicSyntax;