section {* Concrete Syntax *}

theory Quote_Antiquote imports Main begin

syntax
  "_quote"     :: "'b \<Rightarrow> ('a \<Rightarrow> 'b)"                ("(\<guillemotleft>_\<guillemotright>)" [0] 1000)
  "_antiquote" :: "('a \<Rightarrow> 'b) \<Rightarrow> 'b"                ("\<acute>_" [1000] 1000)
  "_Assert"    :: "'a \<Rightarrow> 'a set"                    ("(\<lbrace>_\<rbrace>)" [0] 1000)

translations
  "\<lbrace>b\<rbrace>" \<rightharpoonup> "CONST Collect \<guillemotleft>b\<guillemotright>"

parse_translation {*
  let
    fun quote_tr [t] = Syntax_Trans.quote_tr @{syntax_const "_antiquote"} t
      | quote_tr ts = raise TERM ("quote_tr", ts);
  in [(@{syntax_const "_quote"}, K quote_tr)] end
*}

end