(* Title: HOL/Record.thy
ID: $Id$
Author: Wolfgang Naraschewski and Markus Wenzel, TU Muenchen
Extensible records with structural subtyping in HOL. See
Tools/record_package.ML for the actual implementation.
*)
theory Record = Datatype
files "Tools/record_package.ML":
(* concrete syntax *)
nonterminals
ident field_type field_types field fields update updates
syntax
(*field names*)
"" :: "id => ident" ("_")
"" :: "longid => ident" ("_")
(*record types*)
"_field_type" :: "[ident, type] => field_type" ("(2_ ::/ _)")
"" :: "field_type => field_types" ("_")
"_field_types" :: "[field_type, field_types] => field_types" ("_,/ _")
"_record_type" :: "field_types => type" ("(3'(| _ |'))")
"_record_type_scheme" :: "[field_types, type] => type" ("(3'(| _,/ (2... ::/ _) |'))")
(*records*)
"_field" :: "[ident, 'a] => field" ("(2_ =/ _)")
"" :: "field => fields" ("_")
"_fields" :: "[field, fields] => fields" ("_,/ _")
"_record" :: "fields => 'a" ("(3'(| _ |'))")
"_record_scheme" :: "[fields, 'a] => 'a" ("(3'(| _,/ (2... =/ _) |'))")
(*record updates*)
"_update" :: "[ident, 'a] => update" ("(2_ :=/ _)")
"" :: "update => updates" ("_")
"_updates" :: "[update, updates] => updates" ("_,/ _")
"_record_update" :: "['a, updates] => 'b" ("_/(3'(| _ |'))" [900,0] 900)
(* type class for record extensions *)
axclass more < "term"
instance unit :: more
by intro_classes
(* initialize the package *)
setup
RecordPackage.setup
end