Introduced ._ and _. notation to override first/last default type variables.

This commit is contained in:
Achim D. Brucker 2018-06-22 15:43:07 +01:00
parent 54d9b20cc4
commit 3c1b07e065
1 changed files with 50 additions and 4 deletions

View File

@ -279,7 +279,7 @@ structure Hide_Tvar : HIDE_TVAR = struct
in
Ast.Appl ((Ast.Constant decorated_name)::type_vars_ast)
end
| hide_tvar_ast_tr _ _ = error("Empty AST.")
| hide_tvar_ast_tr _ _ = error("hide_tvar_ast_tr: empty AST.")
fun register typ_str print_mode parse_mode thy =
let
@ -354,8 +354,46 @@ end
section\<open>Register Parse Translation\<close>
syntax "_tvars_wildcard" :: "type \<Rightarrow> type" ("'('_') _")
syntax "_tvars_wildcard_right" :: "type \<Rightarrow> type" ("_ '_.")
syntax "_tvars_wildcard_left" :: "type \<Rightarrow> type" ("_ .'_")
ML{*
datatype tvar_subst = right | left
fun hide_tvar_subst_ast_tr hole ctx (ast::[]) =
let
val thy = Proof_Context.theory_of ctx
fun string_of_ast (Ast.Constant s) = "(C"^s^")"
| string_of_ast (Ast.Variable s) = "(V"^s^")"
| string_of_ast (Ast.Appl ast) = String.concat (map string_of_ast ast)
val (decorated_name, args) = case ast
of (Ast.Appl ((Ast.Constant s)::args)) => (s, args)
| _ => error "Error in obtaining type constructor."
val name = Lexicon.unmark_type decorated_name
val default_info = case Hide_Tvar.lookup thy name of
NONE => error("No default type vars registered: "^name)
| SOME e => e
val _ = if #parse_mode default_info = Hide_Tvar.noparse
then error("Default type vars disabled (option noparse): "^name)
else ()
fun name_of_tvar tvar = case tvar of (TFree(n,_)) => n
| _ => error("Unsupported type structure.")
val type_vars_ast = map (fn n => Ast.Variable(name_of_tvar n)) (#tvars default_info)
val type_vars_ast = case hole of
right => List.drop(List.rev type_vars_ast, List.length args)@args
| left => args@List.drop(type_vars_ast, List.length args)
in
Ast.Appl ((Ast.Constant decorated_name)::type_vars_ast)
end
| hide_tvar_subst_ast_tr _ _ _ = error("hide_tvar_subst_ast_tr: empty AST.")
*}
parse_ast_translation\<open>
[(@{syntax_const "_tvars_wildcard"}, Hide_Tvar.hide_tvar_ast_tr)]
[
(@{syntax_const "_tvars_wildcard"}, Hide_Tvar.hide_tvar_ast_tr),
(@{syntax_const "_tvars_wildcard_right"}, hide_tvar_subst_ast_tr right),
(@{syntax_const "_tvars_wildcard_left"}, hide_tvar_subst_ast_tr left)
]
\<close>
section\<open>Register Top-Level Isar Commands\<close>
@ -419,15 +457,23 @@ assert[string_of_thm_equal,
thm_def="g_def", str="g (a::(_) baz) (b::(_) baz) = a"]
subsection\<open>Parse Translation\<close>
update_default_tvars_mode "_ foobar" (print_all,parse)
update_default_tvars_mode "_ foobar" (print,parse)
declare [[show_types]]
thm f_def
ML {* Ast.Appl *}
declare [[show_types]]
definition A :: "'alpha \<Rightarrow> (_) foobar"
definition A :: "'x \<Rightarrow> (('x::linorder) foobar) ._"
where "A = foo"
definition A' :: "'x \<Rightarrow> (('x,'b) foobar) ._"
where "A' = foo"
definition B' :: "(_) foobar \<Rightarrow> (_) foobar \<Rightarrow> (_) foobar"
where "B' x y = x"
definition B :: "(_) foobar \<Rightarrow> (_) foobar \<Rightarrow> (_) foobar"
where "B x y = x"