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(* Title: HOL/ex/Antiquote.thy
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ID: $Id$
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Author: Markus Wenzel, TU Muenchen
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*)
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header {* Antiquotations *}
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theory Antiquote imports Main begin
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text {*
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A simple example on quote / antiquote in higher-order abstract
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syntax.
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*}
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syntax
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"_Expr" :: "'a => 'a" ("EXPR _" [1000] 999)
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constdefs
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var :: "'a => ('a => nat) => nat" ("VAR _" [1000] 999)
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"var x env == env x"
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Expr :: "(('a => nat) => nat) => ('a => nat) => nat"
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"Expr exp env == exp env"
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parse_translation {* [Syntax.quote_antiquote_tr "_Expr" "var" "Expr"] *}
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print_translation {* [Syntax.quote_antiquote_tr' "_Expr" "var" "Expr"] *}
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term "EXPR (a + b + c)"
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term "EXPR (a + b + c + VAR x + VAR y + 1)"
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term "EXPR (VAR (f w) + VAR x)"
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term "Expr (\<lambda>env. env x)" (*improper*)
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term "Expr (\<lambda>env. f env)"
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term "Expr (\<lambda>env. f env + env x)" (*improper*)
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term "Expr (\<lambda>env. f env y z)"
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term "Expr (\<lambda>env. f env + g y env)"
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term "Expr (\<lambda>env. f env + g env y + h a env z)"
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end
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