author | wenzelm |
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parent 69913 | ca515cf61651 |
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(* Title: HOL/Library/Datatype_Records.thy |
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Author: Lars Hupel |
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*) |
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section \<open>Records based on BNF/datatype machinery\<close> |
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theory Datatype_Records |
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imports Main |
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keywords "datatype_record" :: thy_defn |
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begin |
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text \<open> |
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This theory provides an alternative, stripped-down implementation of records based on the |
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machinery of the @{command datatype} package. |
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It supports: |
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\<^item> similar declaration syntax as records |
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\<^item> record creation and update syntax (using \<open>\<lparr> ... \<rparr>\<close> brackets) |
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\<^item> regular datatype features (e.g. dead type variables etc.) |
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\<^item> ``after-the-fact'' registration of single-free-constructor types as records |
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\<close> |
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text \<open> |
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Caveats: |
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\<^item> there is no compatibility layer; importing this theory will disrupt existing syntax |
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\<^item> extensible records are not supported |
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\<close> |
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no_syntax |
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"_constify" :: "id => ident" ("_") |
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"_constify" :: "longid => ident" ("_") |
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"_field_type" :: "ident => type => field_type" ("(2_ ::/ _)") |
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"" :: "field_type => field_types" ("_") |
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"_field_types" :: "field_type => field_types => field_types" ("_,/ _") |
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"_record_type" :: "field_types => type" ("(3\<lparr>_\<rparr>)") |
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"_record_type_scheme" :: "field_types => type => type" ("(3\<lparr>_,/ (2\<dots> ::/ _)\<rparr>)") |
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"_field" :: "ident => 'a => field" ("(2_ =/ _)") |
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"" :: "field => fields" ("_") |
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"_fields" :: "field => fields => fields" ("_,/ _") |
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"_record" :: "fields => 'a" ("(3\<lparr>_\<rparr>)") |
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"_record_scheme" :: "fields => 'a => 'a" ("(3\<lparr>_,/ (2\<dots> =/ _)\<rparr>)") |
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"_field_update" :: "ident => 'a => field_update" ("(2_ :=/ _)") |
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"" :: "field_update => field_updates" ("_") |
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"_field_updates" :: "field_update => field_updates => field_updates" ("_,/ _") |
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"_record_update" :: "'a => field_updates => 'b" ("_/(3\<lparr>_\<rparr>)" [900, 0] 900) |
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no_syntax (ASCII) |
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"_record_type" :: "field_types => type" ("(3'(| _ |'))") |
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"_record_type_scheme" :: "field_types => type => type" ("(3'(| _,/ (2... ::/ _) |'))") |
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"_record" :: "fields => 'a" ("(3'(| _ |'))") |
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"_record_scheme" :: "fields => 'a => 'a" ("(3'(| _,/ (2... =/ _) |'))") |
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"_record_update" :: "'a => field_updates => 'b" ("_/(3'(| _ |'))" [900, 0] 900) |
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(* copied and adapted from Record.thy *) |
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nonterminal |
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field and |
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fields and |
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field_update and |
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field_updates |
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syntax |
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"_constify" :: "id => ident" ("_") |
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"_constify" :: "longid => ident" ("_") |
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"_datatype_field" :: "ident => 'a => field" ("(2_ =/ _)") |
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"" :: "field => fields" ("_") |
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"_datatype_fields" :: "field => fields => fields" ("_,/ _") |
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"_datatype_record" :: "fields => 'a" ("(3\<lparr>_\<rparr>)") |
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"_datatype_field_update" :: "ident => 'a => field_update" ("(2_ :=/ _)") |
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"" :: "field_update => field_updates" ("_") |
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"_datatype_field_updates" :: "field_update => field_updates => field_updates" ("_,/ _") |
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"_datatype_record_update" :: "'a => field_updates => 'b" ("_/(3\<lparr>_\<rparr>)" [900, 0] 900) |
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syntax (ASCII) |
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"_datatype_record" :: "fields => 'a" ("(3'(| _ |'))") |
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"_datatype_record_scheme" :: "fields => 'a => 'a" ("(3'(| _,/ (2... =/ _) |'))") |
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"_datatype_record_update" :: "'a => field_updates => 'b" ("_/(3'(| _ |'))" [900, 0] 900) |
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named_theorems datatype_record_update |
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ML_file \<open>datatype_records.ML\<close> |
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setup \<open>Datatype_Records.setup\<close> |
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end |