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(* Title: HOL/ex/Antiquote.thy
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Author: Markus Wenzel, TU Muenchen
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*)
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section \<open>Antiquotations\<close>
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theory Antiquote
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imports Main
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begin
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text \<open>A simple example on quote / antiquote in higher-order abstract syntax.\<close>
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definition var :: "'a \<Rightarrow> ('a \<Rightarrow> nat) \<Rightarrow> nat" ("VAR _" [1000] 999)
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where "var x env = env x"
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definition Expr :: "(('a \<Rightarrow> nat) \<Rightarrow> nat) \<Rightarrow> ('a \<Rightarrow> nat) \<Rightarrow> nat"
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where "Expr exp env = exp env"
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syntax
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"_Expr" :: "'a \<Rightarrow> 'a" ("EXPR _" [1000] 999)
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parse_translation
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\<open>[Syntax_Trans.quote_antiquote_tr
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\<^syntax_const>\<open>_Expr\<close> \<^const_syntax>\<open>var\<close> \<^const_syntax>\<open>Expr\<close>]\<close>
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print_translation
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\<open>[Syntax_Trans.quote_antiquote_tr'
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\<^syntax_const>\<open>_Expr\<close> \<^const_syntax>\<open>var\<close> \<^const_syntax>\<open>Expr\<close>]\<close>
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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)" \<comment> \<open>improper\<close>
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term "Expr (\<lambda>env. f env)"
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term "Expr (\<lambda>env. f env + env x)" \<comment> \<open>improper\<close>
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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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