Theory Record

(*  Title:      HOL/Record.thy
    ID:         $Id$
    Author:     Wolfgang Naraschewski, Norbert Schirmer and Markus Wenzel, TU Muenchen
*)

header {* Extensible records with structural subtyping *}

theory Record
imports Product_Type
uses ("Tools/record_package.ML")
begin

lemma prop_subst: "s = t ==> PROP P t ==> PROP P s"
  by simp

lemma rec_UNIV_I: "!!x. x∈UNIV ≡ True"
  by simp

lemma rec_True_simp: "(True ==> PROP P) ≡ PROP P"
  by simp

lemma K_record_comp: "(λx. c) o f = (λx. c)" 
  by (simp add: comp_def)


subsection {* Concrete record syntax *}

nonterminals
  ident field_type field_types field fields update updates
syntax
  "_constify"           :: "id => ident"                        ("_")
  "_constify"           :: "longid => ident"                    ("_")

  "_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... ::/ _) |'))")

  "_field"              :: "[ident, 'a] => field"               ("(2_ =/ _)")
  ""                    :: "field => fields"                    ("_")
  "_fields"             :: "[field, fields] => fields"          ("_,/ _")
  "_record"             :: "fields => 'a"                       ("(3'(| _ |'))")
  "_record_scheme"      :: "[fields, 'a] => 'a"                 ("(3'(| _,/ (2... =/ _) |'))")

  "_update_name"        :: idt
  "_update"             :: "[ident, 'a] => update"              ("(2_ :=/ _)")
  ""                    :: "update => updates"                  ("_")
  "_updates"            :: "[update, updates] => updates"       ("_,/ _")
  "_record_update"      :: "['a, updates] => 'b"                ("_/(3'(| _ |'))" [900,0] 900)

syntax (xsymbols)
  "_record_type"        :: "field_types => type"                ("(3(|_|)),)")
  "_record_type_scheme" :: "[field_types, type] => type"        ("(3(|_,/ (2… ::/ _)|)),)")
  "_record"             :: "fields => 'a"                               ("(3(|_|)),)")
  "_record_scheme"      :: "[fields, 'a] => 'a"                 ("(3(|_,/ (2… =/ _)|)),)")
  "_record_update"      :: "['a, updates] => 'b"                ("_/(3(|_|)),)" [900,0] 900)

use "Tools/record_package.ML"
setup RecordPackage.setup

end