Quelle  RG_Syntax.thy   Sprache: Isabelle

section ‹Concrete Syntax›

theory RG_Syntax
imports RG_Hoare Quote_Antiquote
begin

abbreviation Skip :: "'a com"  (‹SKIP›)
  where "SKIP \ Basic id"

notation Seq  (‹(_;;/ _)› [60,61] 60)

syntax
  "_Assign"    :: "idt \ 'b \ 'a com"                     (‹(🍋_ :=/ _)› [70, 65] 61)
  "_Cond"      :: "'a bexp \ 'a com \ 'a com \ 'a com"   (‹(0IF _/ THEN _/ ELSE _/FI)› [0, 0, 0] 61)
  "_Cond2"     :: "'a bexp \ 'a com \ 'a com"             (‹(0IF _ THEN _ FI)› [0,0] 56)
  "_While"     :: "'a bexp \ 'a com \ 'a com"             (‹(0WHILE _ /DO _ /OD)›  [0, 0] 61)
  "_Await"     :: "'a bexp \ 'a com \ 'a com"             (‹(0AWAIT _ /THEN /_ /END)›  [0,0] 61)
  "_Atom"      :: "'a com \ 'a com"                        (‹(⟨_⟩)› 61)
  "_Wait"      :: "'a bexp \ 'a com"                       (‹(0WAIT _ END)› 61)

translations
  "\x := a" ⇀ "CONST Basic \\(_update_name x (\_. a))\"
  "IF b THEN c1 ELSE c2 FI" ⇀ "CONST Cond \b\ c1 c2"
  "IF b THEN c FI" ⇌ "IF b THEN c ELSE SKIP FI"
  "WHILE b DO c OD" ⇀ "CONST While \b\ c"
  "AWAIT b THEN c END" ⇌ "CONST Await \b\ c"
  "\c\" ⇌ "AWAIT CONST True THEN c END"
  "WAIT b END" ⇌ "AWAIT b THEN SKIP END"

nonterminal prgs

syntax
  "_PAR"        :: "prgs \ 'a"              (‹COBEGIN//_//COEND› 60)
  "_prg"        :: "'a \ prgs"              (‹_› 57)
  "_prgs"       :: "['a, prgs] \ prgs"      (‹_//∥//_› [60,57] 57)

translations
  "_prg a" ⇀ "[a]"
  "_prgs a ps" ⇀ "a # ps"
  "_PAR ps" ⇀ "ps"

syntax
  "_prg_scheme" :: "['a, 'a, 'a, 'a] \ prgs"  (‹SCHEME [_ ≤ _ < _] _› [0,0,0,60] 57)

translations
  "_prg_scheme j i k c" ⇌ "(CONST map (\i. c) [j..

text ‹Translations for variables before and after a transition:›

syntax
  "_before" :: "id \ 'a" (‹♂_›)
  "_after"  :: "id \ 'a" (‹♀_›)

translations
  "\x" ⇌ "x \CONST fst"
  "\x" ⇌ "x \CONST snd"

print_translation ‹
  let
    fun quote_tr' f (t :: ts) =
          Term.list_comb (f $ Syntax_Trans.quote_tr' \<^syntax_const>\_antiquote\ t, ts)
      | quote_tr' _ _ = raise Match;

    val assert_tr' = quote_tr' (Syntax.const 🍋‹_Assert›);

    fun bexp_tr' name ((Const (\<^const_syntax>\Collect\, _) $ t) :: ts) =
          quote_tr' (Syntax.const name) (t :: ts)
      | bexp_tr' _ _ = raise Match;

    fun assign_tr' (Abs (x, _, f $ k $ Bound 0) :: ts) =
          quote_tr' (Syntax.const \<^syntax_const>\_Assign\ $ Syntax_Trans.update_name_tr' f)
            (Abs (x, dummyT, Syntax_Trans.const_abs_tr' k) :: ts)
      | assign_tr' _ = raise Match;
  in
   [(🍋‹Collect›, K assert_tr'),
    (🍋‹Basic›, K assign_tr'),
    (🍋‹Cond›, K (bexp_tr' \<^syntax_const>\_Cond\)),
    (🍋‹While›, K (bexp_tr' \<^syntax_const>\_While\))]
  end
›

end