src/Pure/Syntax/syntax.ML
author berghofe
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Added some functions which allow redirection of Isabelle's output
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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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infix |-> <-| <->;
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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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  datatype 'a trrule =
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    op |-> of 'a * 'a |
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    op <-| of 'a * 'a |
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    op <-> of 'a * 'a
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  end;
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signature SYNTAX =
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  sig
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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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  datatype 'a trrule =
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    op |-> of 'a * 'a |
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    op <-| of 'a * 'a |
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    op <-> of 'a * 'a
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  type syntax
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  val extend_log_types: syntax -> string list -> syntax
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  val extend_type_gram: syntax -> (string * int * mixfix) list -> syntax
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  val extend_const_gram: syntax -> (string * typ * mixfix) list -> syntax
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  val extend_consts: syntax -> string list -> syntax
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  val extend_trfuns: syntax ->
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    (string * (ast list -> ast)) list *
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    (string * (term list -> term)) list *
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    (string * (term list -> term)) list *
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    (string * (ast list -> ast)) list -> syntax
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  val extend_trrules: syntax -> (string * string) trrule list -> syntax
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  val extend_trrules_i: syntax -> ast trrule list -> syntax
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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 test_read: syntax -> string -> string -> unit
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  val read: syntax -> typ -> string -> term list
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  val read_typ: syntax -> (indexname -> sort) -> string -> typ
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  val simple_read_typ: string -> typ
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  val pretty_term: bool -> syntax -> term -> Pretty.T
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  val pretty_typ: syntax -> typ -> Pretty.T
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  val string_of_term: bool -> syntax -> term -> string
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  val string_of_typ: syntax -> typ -> string
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  val simple_string_of_typ: typ -> string
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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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  end;
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structure Syntax : SYNTAX =
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struct
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open Lexicon SynExt Ast Parser TypeExt SynTrans Mixfix Printer;
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(** tables of translation functions **)
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(*the ref serves as unique id*)
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type 'a trtab = (('a list -> 'a) * unit ref) Symtab.table;
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val dest_trtab = Symtab.dest;
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fun lookup_trtab tab c =
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  apsome fst (Symtab.lookup (tab, c));
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(* empty, extend, merge trtabs *)
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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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val empty_trtab = Symtab.null;
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fun extend_trtab tab trfuns name =
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  Symtab.extend_new (tab, map (fn (c, f) => (c, (f, ref ()))) trfuns)
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    handle Symtab.DUPS cs => err_dup_trfuns name cs;
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fun merge_trtabs tab1 tab2 name =
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  Symtab.merge eq_snd (tab1, tab2)
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    handle Symtab.DUPS cs => err_dup_trfuns name cs;
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(** tables of translation rules **)
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type ruletab = (ast * ast) list Symtab.table;
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fun dest_ruletab tab = flat (map snd (Symtab.dest tab));
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(* lookup_ruletab *)
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fun lookup_ruletab tab =
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  if Symtab.is_null tab then None
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  else Some (fn a => Symtab.lookup_multi (tab, a));
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(* empty, extend, merge ruletabs *)
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val empty_ruletab = Symtab.null;
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fun extend_ruletab tab rules =
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  generic_extend (op =) Symtab.dest_multi Symtab.make_multi tab
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    (map (fn r => (head_of_rule r, r)) (distinct rules));
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fun merge_ruletabs tab1 tab2 =
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  generic_merge (op =) Symtab.dest_multi Symtab.make_multi tab1 tab2;
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(** datatype syntax **)
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datatype syntax =
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  Syntax of {
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    lexicon: lexicon,
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    logtypes: string list,
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    gram: gram,
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    consts: string list,
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    parse_ast_trtab: ast trtab,
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    parse_ruletab: ruletab,
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    parse_trtab: term trtab,
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    print_trtab: term trtab,
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    print_ruletab: ruletab,
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    print_ast_trtab: ast trtab,
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    prtab: prtab};
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(* empty_syntax *)
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val empty_syntax =
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  Syntax {
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    lexicon = empty_lexicon,
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    logtypes = [],
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    gram = empty_gram,
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    consts = [],
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    parse_ast_trtab = empty_trtab,
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    parse_ruletab = empty_ruletab,
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    parse_trtab = empty_trtab,
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    print_trtab = empty_trtab,
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    print_ruletab = empty_ruletab,
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    print_ast_trtab = empty_trtab,
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    prtab = empty_prtab};
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(* extend_syntax *)
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fun extend_syntax (Syntax tabs) syn_ext =
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  let
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    val {lexicon, logtypes = logtypes1, gram, consts = consts1, parse_ast_trtab,
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      parse_ruletab, parse_trtab, print_trtab, print_ruletab, print_ast_trtab,
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      prtab} = tabs;
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    val SynExt {logtypes = logtypes2, xprods, consts = consts2, parse_ast_translation,
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      parse_rules, parse_translation, print_translation, print_rules,
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      print_ast_translation} = syn_ext;
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  in
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    Syntax {
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      lexicon = extend_lexicon lexicon (delims_of xprods),
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      logtypes = extend_list logtypes1 logtypes2,
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      gram = extend_gram gram xprods,
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      consts = consts2 union consts1,
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      parse_ast_trtab =
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        extend_trtab parse_ast_trtab parse_ast_translation "parse ast translation",
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      parse_ruletab = extend_ruletab parse_ruletab parse_rules,
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      parse_trtab = extend_trtab parse_trtab parse_translation "parse translation",
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      print_trtab = extend_trtab print_trtab print_translation "print translation",
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      print_ruletab = extend_ruletab print_ruletab print_rules,
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      print_ast_trtab =
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        extend_trtab print_ast_trtab print_ast_translation "print ast translation",
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      prtab = extend_prtab prtab xprods}
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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 {lexicon = lexicon1, logtypes = logtypes1, gram = gram1, consts = consts1,
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      parse_ast_trtab = parse_ast_trtab1, parse_ruletab = parse_ruletab1,
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      parse_trtab = parse_trtab1, print_trtab = print_trtab1,
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      print_ruletab = print_ruletab1, print_ast_trtab = print_ast_trtab1,
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      prtab = prtab1} = tabs1;
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    val {lexicon = lexicon2, logtypes = logtypes2, gram = gram2, consts = consts2,
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      parse_ast_trtab = parse_ast_trtab2, parse_ruletab = parse_ruletab2,
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      parse_trtab = parse_trtab2, print_trtab = print_trtab2,
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      print_ruletab = print_ruletab2, print_ast_trtab = print_ast_trtab2,
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      prtab = prtab2} = tabs2;
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  in
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    Syntax {
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      lexicon = merge_lexicons lexicon1 lexicon2,
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      logtypes = merge_lists logtypes1 logtypes2,
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      gram = merge_grams gram1 gram2,
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      consts = merge_lists consts1 consts2,
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      parse_ast_trtab =
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        merge_trtabs parse_ast_trtab1 parse_ast_trtab2 "parse ast translation",
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      parse_ruletab = merge_ruletabs parse_ruletab1 parse_ruletab2,
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      parse_trtab = merge_trtabs parse_trtab1 parse_trtab2 "parse translation",
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      print_trtab = merge_trtabs print_trtab1 print_trtab2 "print translation",
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      print_ruletab = merge_ruletabs print_ruletab1 print_ruletab2,
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      print_ast_trtab =
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        merge_trtabs print_ast_trtab1 print_ast_trtab2 "print ast translation",
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      prtab = merge_prtabs prtab1 prtab2}
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  end;
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(* type_syn *)
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val type_syn = extend_syntax empty_syntax type_ext;
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val pure_syn = extend_syntax type_syn pure_ext;
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(** inspect syntax **)
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fun pretty_strs_qs name strs =
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  Pretty.strs (name :: map quote (sort_strings strs));
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(* print_gram *)
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fun print_gram (Syntax tabs) =
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  let
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    val {lexicon, logtypes, gram, ...} = tabs;
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  in
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    Pretty.writeln (pretty_strs_qs "lexicon:" (dest_lexicon lexicon));
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    Pretty.writeln (Pretty.strs ("logtypes:" :: logtypes));
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    Pretty.writeln (Pretty.big_list "prods:" (pretty_gram gram))
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  end;
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(* print_trans *)
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fun print_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 (map fst (dest_trtab tab));
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    fun pretty_ruletab name tab =
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      Pretty.big_list name (map pretty_rule (dest_ruletab tab));
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    val {consts, parse_ast_trtab, parse_ruletab, parse_trtab, print_trtab,
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      print_ruletab, print_ast_trtab, ...} = tabs;
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  in
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    Pretty.writeln (pretty_strs_qs "consts:" consts);
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    Pretty.writeln (pretty_trtab "parse_ast_translation:" parse_ast_trtab);
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    Pretty.writeln (pretty_ruletab "parse_rules:" parse_ruletab);
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    Pretty.writeln (pretty_trtab "parse_translation:" parse_trtab);
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    Pretty.writeln (pretty_trtab "print_translation:" print_trtab);
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    Pretty.writeln (pretty_ruletab "print_rules:" print_ruletab);
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    Pretty.writeln (pretty_trtab "print_ast_translation:" print_ast_trtab)
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  end;
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(* print_syntax *)
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fun print_syntax syn = (print_gram syn; print_trans syn);
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(** read **)
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(* test_read *)
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fun test_read (Syntax tabs) root str =
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  let
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    val {lexicon, gram, parse_ast_trtab, parse_ruletab, ...} = tabs;
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    val toks = tokenize lexicon false str;
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    val _ = writeln ("tokens: " ^ space_implode " " (map display_token toks));
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    fun show_pt pt =
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      let
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        val raw_ast = pt_to_ast (K None) pt;
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        val _ = writeln ("raw: " ^ str_of_ast raw_ast);
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        val pre_ast = pt_to_ast (lookup_trtab parse_ast_trtab) pt;
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        val _ = normalize true true (lookup_ruletab parse_ruletab) pre_ast;
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      in () end;
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  in
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    seq show_pt (parse gram root toks)
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  end;
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(* read_ast *)
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val ambiguity_level = ref 1;
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fun read_asts (Syntax tabs) xids root str =
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  let
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    val {lexicon, gram, parse_ast_trtab, logtypes, ...} = tabs;
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    val root' = if root mem logtypes then logic else root;
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    val pts = parse gram root' (tokenize lexicon xids str);
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    fun show_pt pt = writeln (str_of_ast (pt_to_ast (K None) pt));
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  in
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    if length pts > ! ambiguity_level then
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      (warning ("Ambiguous input " ^ quote str);
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       writeln "produces the following parse trees:";
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       seq show_pt pts)
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    else ();
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    map (pt_to_ast (lookup_trtab parse_ast_trtab)) pts
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  end;
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(* read *)
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fun read (syn as Syntax tabs) ty str =
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  let
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    val {parse_ruletab, parse_trtab, ...} = tabs;
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    val asts = read_asts syn false (typ_to_nonterm ty) str;
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  in
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    map (ast_to_term (lookup_trtab parse_trtab))
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      (map (normalize_ast (lookup_ruletab parse_ruletab)) asts)
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  end;
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(* read types *)
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fun read_typ syn def_sort str =
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  (case read syn typeT str of
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    [t] => typ_of_term (raw_term_sorts t) def_sort t
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  | _ => sys_error "read_typ: ambiguous type syntax");
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fun simple_read_typ str = read_typ type_syn (K []) str;
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(** prepare translation rules **)
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datatype 'a trrule =
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  op |-> of 'a * 'a |
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  op <-| of 'a * 'a |
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  op <-> of 'a * 'a;
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fun map_rule f (x |-> y) = (f x |-> f y)
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  | map_rule f (x <-| y) = (f x <-| f y)
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  | map_rule f (x <-> y) = (f x <-> f y);
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fun right_rule (pat1 |-> pat2) = Some (pat1, pat2)
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  | right_rule (pat1 <-| pat2) = None
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  | right_rule (pat1 <-> pat2) = Some (pat1, pat2);
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fun left_rule (pat1 |-> pat2) = None
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  | left_rule (pat1 <-| pat2) = Some (pat2, pat1)
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  | left_rule (pat1 <-> pat2) = Some (pat2, pat1);
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fun check_rule (rule as (lhs, rhs)) =
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  (case rule_error rule of
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    Some msg =>
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      error ("Error in syntax translation rule: " ^ msg ^ "\n" ^
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        str_of_ast lhs ^ "  ->  " ^ str_of_ast rhs)
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  | None => rule);
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fun read_pattern syn (root, str) =
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  let
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    val Syntax {consts, ...} = syn;
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    fun constify (ast as Constant _) = ast
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      | constify (ast as Variable x) =
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          if x mem consts then Constant x else ast
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      | constify (Appl asts) = Appl (map constify asts);
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  in
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    (case read_asts syn true root str of
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      [ast] => constify ast
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    | _ => error ("Syntactically ambiguous input: " ^ quote str))
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  end handle ERROR =>
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    error ("The error(s) above occurred in translation pattern " ^
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      quote str);
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fun prep_rules rd_pat raw_rules =
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  let val rules = map (map_rule rd_pat) raw_rules in
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    (map check_rule (mapfilter right_rule rules),
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      map check_rule (mapfilter left_rule rules))
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   391
  end
18
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   395
(** pretty terms or typs **)
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922
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fun pretty_t t_to_ast pretty_t curried (syn as Syntax tabs) t =
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  let
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   399
    val {print_trtab, print_ruletab, print_ast_trtab, prtab, ...} = tabs;
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    val ast = t_to_ast (lookup_trtab print_trtab) t;
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  in
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   402
    pretty_t curried prtab (lookup_trtab print_ast_trtab)
237
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      (normalize_ast (lookup_ruletab print_ruletab) ast)
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   404
  end;
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val pretty_term = pretty_t term_to_ast pretty_term_ast;
922
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   407
val pretty_typ = pretty_t typ_to_ast pretty_typ_ast false;
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   409
fun string_of_term curried syn t =
196ca0973a6d added CPure (curried functions) and ProtoPure (ancestor of Pure and CPure)
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diff changeset
   410
  Pretty.string_of (pretty_term curried syn t);
260
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   411
fun string_of_typ syn ty = Pretty.string_of (pretty_typ syn ty);
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260
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   413
val simple_string_of_typ = string_of_typ type_syn;
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   414
val simple_pprint_typ = Pretty.pprint o Pretty.quote o (pretty_typ type_syn);
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383
fcea89074e4c added incremental extension functions: extend_log_types, extend_type_gram,
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diff changeset
   418
(** extend syntax (external interfaces) **)
fcea89074e4c added incremental extension functions: extend_log_types, extend_type_gram,
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diff changeset
   419
764
b60e77395d1a changed Pure's grammar and the way types are converted to nonterminals
clasohm
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   420
fun ext_syntax mk_syn_ext (syn as Syntax {logtypes, ...}) decls =
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   421
  extend_syntax syn (mk_syn_ext logtypes decls);
383
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   422
167
128e122acc89 added (partial) extend_tables;
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   423
764
b60e77395d1a changed Pure's grammar and the way types are converted to nonterminals
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   424
fun extend_log_types syn logtypes =
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   425
  extend_syntax syn (syn_ext_logtypes logtypes);
383
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diff changeset
   426
556
3f5f42467717 added type xrule (from sextension.ML);
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   427
val extend_type_gram = ext_syntax syn_ext_types;
383
fcea89074e4c added incremental extension functions: extend_log_types, extend_type_gram,
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diff changeset
   428
556
3f5f42467717 added type xrule (from sextension.ML);
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   429
val extend_const_gram = ext_syntax syn_ext_consts;
383
fcea89074e4c added incremental extension functions: extend_log_types, extend_type_gram,
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diff changeset
   430
fcea89074e4c added incremental extension functions: extend_log_types, extend_type_gram,
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diff changeset
   431
val extend_consts = ext_syntax syn_ext_const_names;
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   432
fcea89074e4c added incremental extension functions: extend_log_types, extend_type_gram,
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diff changeset
   433
val extend_trfuns = ext_syntax syn_ext_trfuns;
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diff changeset
   434
1158
96804ce95516 added extend_trrules_i;
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   435
fun extend_trrules syn rules =
96804ce95516 added extend_trrules_i;
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diff changeset
   436
  ext_syntax syn_ext_rules syn (prep_rules (read_pattern syn) rules);
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   437
96804ce95516 added extend_trrules_i;
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   438
fun extend_trrules_i syn rules =
96804ce95516 added extend_trrules_i;
wenzelm
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   439
  ext_syntax syn_ext_rules syn (prep_rules I rules);
383
fcea89074e4c added incremental extension functions: extend_log_types, extend_type_gram,
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0
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end;