author | wenzelm |
Sun, 28 Nov 2010 16:15:31 +0100 | |
changeset 40784 | 177e8cea3e09 |
parent 40256 | eb5412b77ac4 |
child 40800 | 330eb65c9469 |
permissions | -rw-r--r-- |
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theory Spec |
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imports Main |
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begin |
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chapter {* Theory specifications *} |
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text {* |
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The Isabelle/Isar theory format integrates specifications and |
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proofs, supporting interactive development with unlimited undo |
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operation. There is an integrated document preparation system (see |
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\chref{ch:document-prep}), for typesetting formal developments |
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together with informal text. The resulting hyper-linked PDF |
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documents can be used both for WWW presentation and printed copies. |
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The Isar proof language (see \chref{ch:proofs}) is embedded into the |
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theory language as a proper sub-language. Proof mode is entered by |
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stating some @{command theorem} or @{command lemma} at the theory |
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level, and left again with the final conclusion (e.g.\ via @{command |
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qed}). Some theory specification mechanisms also require a proof, |
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such as @{command typedef} in HOL, which demands non-emptiness of |
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the representing sets. |
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*} |
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section {* Defining theories \label{sec:begin-thy} *} |
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text {* |
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\begin{matharray}{rcl} |
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@{command_def "theory"} & : & @{text "toplevel \<rightarrow> theory"} \\ |
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@{command_def (global) "end"} & : & @{text "theory \<rightarrow> toplevel"} \\ |
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\end{matharray} |
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Isabelle/Isar theories are defined via theory files, which may |
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contain both specifications and proofs; occasionally definitional |
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mechanisms also require some explicit proof. The theory body may be |
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sub-structured by means of \emph{local theory targets}, such as |
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@{command "locale"} and @{command "class"}. |
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The first proper command of a theory is @{command "theory"}, which |
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indicates imports of previous theories and optional dependencies on |
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other source files (usually in ML). Just preceding the initial |
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@{command "theory"} command there may be an optional @{command |
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"header"} declaration, which is only relevant to document |
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preparation: see also the other section markup commands in |
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\secref{sec:markup}. |
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A theory is concluded by a final @{command (global) "end"} command, |
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one that does not belong to a local theory target. No further |
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commands may follow such a global @{command (global) "end"}, |
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although some user-interfaces might pretend that trailing input is |
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admissible. |
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\begin{rail} |
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'theory' name 'imports' (name +) uses? 'begin' |
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; |
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uses: 'uses' ((name | parname) +); |
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\end{rail} |
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\begin{description} |
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\item @{command "theory"}~@{text "A \<IMPORTS> B\<^sub>1 \<dots> B\<^sub>n \<BEGIN>"} |
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starts a new theory @{text A} based on the merge of existing |
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theories @{text "B\<^sub>1 \<dots> B\<^sub>n"}. |
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Due to the possibility to import more than one ancestor, the |
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resulting theory structure of an Isabelle session forms a directed |
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acyclic graph (DAG). Isabelle's theory loader ensures that the |
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sources contributing to the development graph are always up-to-date: |
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changed files are automatically reloaded whenever a theory header |
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specification is processed. |
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The optional @{keyword_def "uses"} specification declares additional |
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dependencies on extra files (usually ML sources). Files will be |
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loaded immediately (as ML), unless the name is parenthesized. The |
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latter case records a dependency that needs to be resolved later in |
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the text, usually via explicit @{command_ref "use"} for ML files; |
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other file formats require specific load commands defined by the |
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corresponding tools or packages. |
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\item @{command (global) "end"} concludes the current theory |
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definition. Note that local theory targets involve a local |
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@{command (local) "end"}, which is clear from the nesting. |
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\end{description} |
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*} |
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section {* Local theory targets \label{sec:target} *} |
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text {* |
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A local theory target is a context managed separately within the |
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enclosing theory. Contexts may introduce parameters (fixed |
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variables) and assumptions (hypotheses). Definitions and theorems |
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depending on the context may be added incrementally later on. Named |
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contexts refer to locales (cf.\ \secref{sec:locale}) or type classes |
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(cf.\ \secref{sec:class}); the name ``@{text "-"}'' signifies the |
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global theory context. |
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\begin{matharray}{rcll} |
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@{command_def "context"} & : & @{text "theory \<rightarrow> local_theory"} \\ |
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@{command_def (local) "end"} & : & @{text "local_theory \<rightarrow> theory"} \\ |
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\end{matharray} |
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\indexouternonterm{target} |
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\begin{rail} |
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'context' name 'begin' |
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; |
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target: '(' 'in' name ')' |
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; |
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\end{rail} |
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\begin{description} |
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\item @{command "context"}~@{text "c \<BEGIN>"} recommences an |
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existing locale or class context @{text c}. Note that locale and |
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class definitions allow to include the @{keyword "begin"} keyword as |
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well, in order to continue the local theory immediately after the |
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initial specification. |
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\item @{command (local) "end"} concludes the current local theory |
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and continues the enclosing global theory. Note that a global |
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@{command (global) "end"} has a different meaning: it concludes the |
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theory itself (\secref{sec:begin-thy}). |
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\item @{text "("}@{keyword_def "in"}~@{text "c)"} given after any |
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local theory command specifies an immediate target, e.g.\ |
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``@{command "definition"}~@{text "(\<IN> c) \<dots>"}'' or ``@{command |
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"theorem"}~@{text "(\<IN> c) \<dots>"}''. This works both in a local or |
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global theory context; the current target context will be suspended |
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for this command only. Note that ``@{text "(\<IN> -)"}'' will |
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always produce a global result independently of the current target |
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context. |
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\end{description} |
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The exact meaning of results produced within a local theory context |
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depends on the underlying target infrastructure (locale, type class |
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etc.). The general idea is as follows, considering a context named |
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@{text c} with parameter @{text x} and assumption @{text "A[x]"}. |
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Definitions are exported by introducing a global version with |
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additional arguments; a syntactic abbreviation links the long form |
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with the abstract version of the target context. For example, |
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@{text "a \<equiv> t[x]"} becomes @{text "c.a ?x \<equiv> t[?x]"} at the theory |
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level (for arbitrary @{text "?x"}), together with a local |
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abbreviation @{text "c \<equiv> c.a x"} in the target context (for the |
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fixed parameter @{text x}). |
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Theorems are exported by discharging the assumptions and |
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generalizing the parameters of the context. For example, @{text "a: |
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B[x]"} becomes @{text "c.a: A[?x] \<Longrightarrow> B[?x]"}, again for arbitrary |
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@{text "?x"}. |
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*} |
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section {* Basic specification elements *} |
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text {* |
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\begin{matharray}{rcll} |
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@{command_def "axiomatization"} & : & @{text "theory \<rightarrow> theory"} & (axiomatic!) \\ |
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@{command_def "definition"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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@{attribute_def "defn"} & : & @{text attribute} \\ |
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@{command_def "abbreviation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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@{command_def "print_abbrevs"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow> "} \\ |
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\end{matharray} |
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These specification mechanisms provide a slightly more abstract view |
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than the underlying primitives of @{command "consts"}, @{command |
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"defs"} (see \secref{sec:consts}), and @{command "axioms"} (see |
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\secref{sec:axms-thms}). In particular, type-inference is commonly |
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available, and result names need not be given. |
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\begin{rail} |
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'axiomatization' target? fixes? ('where' specs)? |
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; |
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'definition' target? (decl 'where')? thmdecl? prop |
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; |
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'abbreviation' target? mode? (decl 'where')? prop |
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; |
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fixes: ((name ('::' type)? mixfix? | vars) + 'and') |
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; |
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specs: (thmdecl? props + 'and') |
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; |
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decl: name ('::' type)? mixfix? |
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; |
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\end{rail} |
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\begin{description} |
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\item @{command "axiomatization"}~@{text "c\<^sub>1 \<dots> c\<^sub>m \<WHERE> \<phi>\<^sub>1 \<dots> \<phi>\<^sub>n"} |
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introduces several constants simultaneously and states axiomatic |
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properties for these. The constants are marked as being specified |
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once and for all, which prevents additional specifications being |
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issued later on. |
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Note that axiomatic specifications are only appropriate when |
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declaring a new logical system; axiomatic specifications are |
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restricted to global theory contexts. Normal applications should |
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only use definitional mechanisms! |
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\item @{command "definition"}~@{text "c \<WHERE> eq"} produces an |
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internal definition @{text "c \<equiv> t"} according to the specification |
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given as @{text eq}, which is then turned into a proven fact. The |
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given proposition may deviate from internal meta-level equality |
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according to the rewrite rules declared as @{attribute defn} by the |
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object-logic. This usually covers object-level equality @{text "x = |
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y"} and equivalence @{text "A \<leftrightarrow> B"}. End-users normally need not |
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change the @{attribute defn} setup. |
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Definitions may be presented with explicit arguments on the LHS, as |
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well as additional conditions, e.g.\ @{text "f x y = t"} instead of |
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@{text "f \<equiv> \<lambda>x y. t"} and @{text "y \<noteq> 0 \<Longrightarrow> g x y = u"} instead of an |
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unrestricted @{text "g \<equiv> \<lambda>x y. u"}. |
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\item @{command "abbreviation"}~@{text "c \<WHERE> eq"} introduces a |
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syntactic constant which is associated with a certain term according |
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to the meta-level equality @{text eq}. |
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Abbreviations participate in the usual type-inference process, but |
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are expanded before the logic ever sees them. Pretty printing of |
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terms involves higher-order rewriting with rules stemming from |
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reverted abbreviations. This needs some care to avoid overlapping |
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or looping syntactic replacements! |
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The optional @{text mode} specification restricts output to a |
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particular print mode; using ``@{text input}'' here achieves the |
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effect of one-way abbreviations. The mode may also include an |
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``@{keyword "output"}'' qualifier that affects the concrete syntax |
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declared for abbreviations, cf.\ @{command "syntax"} in |
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\secref{sec:syn-trans}. |
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\item @{command "print_abbrevs"} prints all constant abbreviations |
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of the current context. |
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\end{description} |
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*} |
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section {* Generic declarations *} |
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text {* |
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Arbitrary operations on the background context may be wrapped-up as |
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generic declaration elements. Since the underlying concept of local |
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theories may be subject to later re-interpretation, there is an |
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additional dependency on a morphism that tells the difference of the |
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original declaration context wrt.\ the application context |
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encountered later on. A fact declaration is an important special |
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case: it consists of a theorem which is applied to the context by |
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means of an attribute. |
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\begin{matharray}{rcl} |
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@{command_def "declaration"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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@{command_def "syntax_declaration"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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@{command_def "declare"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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\end{matharray} |
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\begin{rail} |
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('declaration' | 'syntax_declaration') ('(pervasive)')? target? text |
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; |
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'declare' target? (thmrefs + 'and') |
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; |
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\end{rail} |
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\begin{description} |
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\item @{command "declaration"}~@{text d} adds the declaration |
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function @{text d} of ML type @{ML_type declaration}, to the current |
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local theory under construction. In later application contexts, the |
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function is transformed according to the morphisms being involved in |
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the interpretation hierarchy. |
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If the @{text "(pervasive)"} option is given, the corresponding |
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declaration is applied to all possible contexts involved, including |
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the global background theory. |
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\item @{command "syntax_declaration"} is similar to @{command |
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"declaration"}, but is meant to affect only ``syntactic'' tools by |
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convention (such as notation and type-checking information). |
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\item @{command "declare"}~@{text thms} declares theorems to the |
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current local theory context. No theorem binding is involved here, |
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unlike @{command "theorems"} or @{command "lemmas"} (cf.\ |
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\secref{sec:axms-thms}), so @{command "declare"} only has the effect |
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of applying attributes as included in the theorem specification. |
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\end{description} |
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*} |
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section {* Locales \label{sec:locale} *} |
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text {* |
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Locales are parametric named local contexts, consisting of a list of |
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declaration elements that are modeled after the Isar proof context |
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commands (cf.\ \secref{sec:proof-context}). |
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*} |
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subsection {* Locale expressions \label{sec:locale-expr} *} |
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text {* |
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A \emph{locale expression} denotes a structured context composed of |
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instances of existing locales. The context consists of a list of |
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instances of declaration elements from the locales. Two locale |
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instances are equal if they are of the same locale and the |
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parameters are instantiated with equivalent terms. Declaration |
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elements from equal instances are never repeated, thus avoiding |
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duplicate declarations. |
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\indexouternonterm{localeexpr} |
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\begin{rail} |
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localeexpr: (instance + '+') ('for' (fixes + 'and'))? |
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; |
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instance: (qualifier ':')? nameref (posinsts | namedinsts) |
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; |
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qualifier: name ('?' | '!')? |
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; |
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posinsts: (term | '_')* |
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; |
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namedinsts: 'where' (name '=' term + 'and') |
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; |
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\end{rail} |
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A locale instance consists of a reference to a locale and either |
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positional or named parameter instantiations. Identical |
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instantiations (that is, those that instante a parameter by itself) |
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may be omitted. The notation `@{text "_"}' enables to omit the |
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instantiation for a parameter inside a positional instantiation. |
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333 |
Terms in instantiations are from the context the locale expressions |
|
334 |
is declared in. Local names may be added to this context with the |
|
335 |
optional for clause. In addition, syntax declarations from one |
|
336 |
instance are effective when parsing subsequent instances of the same |
|
337 |
expression. |
|
338 |
||
339 |
Instances have an optional qualifier which applies to names in |
|
340 |
declarations. Names include local definitions and theorem names. |
|
341 |
If present, the qualifier itself is either optional |
|
342 |
(``\texttt{?}''), which means that it may be omitted on input of the |
|
343 |
qualified name, or mandatory (``\texttt{!}''). If neither |
|
344 |
``\texttt{?}'' nor ``\texttt{!}'' are present, the command's default |
|
345 |
is used. For @{command "interpretation"} and @{command "interpret"} |
|
346 |
the default is ``mandatory'', for @{command "locale"} and @{command |
|
347 |
"sublocale"} the default is ``optional''. |
|
348 |
*} |
|
349 |
||
350 |
||
351 |
subsection {* Locale declarations *} |
|
27040 | 352 |
|
353 |
text {* |
|
354 |
\begin{matharray}{rcl} |
|
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@{command_def "locale"} & : & @{text "theory \<rightarrow> local_theory"} \\ |
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@{command_def "print_locale"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{command_def "print_locales"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{method_def intro_locales} & : & @{text method} \\ |
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@{method_def unfold_locales} & : & @{text method} \\ |
27040 | 360 |
\end{matharray} |
361 |
||
33846 | 362 |
\indexouternonterm{contextelem} |
27040 | 363 |
\indexisarelem{fixes}\indexisarelem{constrains}\indexisarelem{assumes} |
28787 | 364 |
\indexisarelem{defines}\indexisarelem{notes} |
27040 | 365 |
\begin{rail} |
33846 | 366 |
'locale' name ('=' locale)? 'begin'? |
27040 | 367 |
; |
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'print_locale' '!'? nameref |
27040 | 369 |
; |
33846 | 370 |
locale: contextelem+ | localeexpr ('+' (contextelem+))? |
27040 | 371 |
; |
33846 | 372 |
contextelem: |
373 |
'fixes' (fixes + 'and') |
|
374 |
| 'constrains' (name '::' type + 'and') |
|
375 |
| 'assumes' (props + 'and') |
|
376 |
| 'defines' (thmdecl? prop proppat? + 'and') |
|
377 |
| 'notes' (thmdef? thmrefs + 'and') |
|
27040 | 378 |
; |
379 |
\end{rail} |
|
380 |
||
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\begin{description} |
27040 | 382 |
|
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\item @{command "locale"}~@{text "loc = import + body"} defines a |
27040 | 384 |
new locale @{text loc} as a context consisting of a certain view of |
385 |
existing locales (@{text import}) plus some additional elements |
|
386 |
(@{text body}). Both @{text import} and @{text body} are optional; |
|
387 |
the degenerate form @{command "locale"}~@{text loc} defines an empty |
|
388 |
locale, which may still be useful to collect declarations of facts |
|
389 |
later on. Type-inference on locale expressions automatically takes |
|
390 |
care of the most general typing that the combined context elements |
|
391 |
may acquire. |
|
392 |
||
33846 | 393 |
The @{text import} consists of a structured locale expression; see |
394 |
\secref{sec:proof-context} above. Its for clause defines the local |
|
395 |
parameters of the @{text import}. In addition, locale parameters |
|
396 |
whose instantance is omitted automatically extend the (possibly |
|
397 |
empty) for clause: they are inserted at its beginning. This means |
|
398 |
that these parameters may be referred to from within the expression |
|
399 |
and also in the subsequent context elements and provides a |
|
400 |
notational convenience for the inheritance of parameters in locale |
|
401 |
declarations. |
|
27040 | 402 |
|
33846 | 403 |
The @{text body} consists of context elements. |
27040 | 404 |
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\begin{description} |
27040 | 406 |
|
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\item @{element "fixes"}~@{text "x :: \<tau> (mx)"} declares a local |
27040 | 408 |
parameter of type @{text \<tau>} and mixfix annotation @{text mx} (both |
409 |
are optional). The special syntax declaration ``@{text |
|
410 |
"(\<STRUCTURE>)"}'' means that @{text x} may be referenced |
|
411 |
implicitly in this context. |
|
412 |
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\item @{element "constrains"}~@{text "x :: \<tau>"} introduces a type |
33846 | 414 |
constraint @{text \<tau>} on the local parameter @{text x}. This |
38110 | 415 |
element is deprecated. The type constraint should be introduced in |
33846 | 416 |
the for clause or the relevant @{element "fixes"} element. |
27040 | 417 |
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\item @{element "assumes"}~@{text "a: \<phi>\<^sub>1 \<dots> \<phi>\<^sub>n"} |
27040 | 419 |
introduces local premises, similar to @{command "assume"} within a |
420 |
proof (cf.\ \secref{sec:proof-context}). |
|
421 |
||
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\item @{element "defines"}~@{text "a: x \<equiv> t"} defines a previously |
27040 | 423 |
declared parameter. This is similar to @{command "def"} within a |
424 |
proof (cf.\ \secref{sec:proof-context}), but @{element "defines"} |
|
425 |
takes an equational proposition instead of variable-term pair. The |
|
426 |
left-hand side of the equation may have additional arguments, e.g.\ |
|
427 |
``@{element "defines"}~@{text "f x\<^sub>1 \<dots> x\<^sub>n \<equiv> t"}''. |
|
428 |
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\item @{element "notes"}~@{text "a = b\<^sub>1 \<dots> b\<^sub>n"} |
27040 | 430 |
reconsiders facts within a local context. Most notably, this may |
431 |
include arbitrary declarations in any attribute specifications |
|
432 |
included here, e.g.\ a local @{attribute simp} rule. |
|
433 |
||
28787 | 434 |
The initial @{text import} specification of a locale expression |
435 |
maintains a dynamic relation to the locales being referenced |
|
436 |
(benefiting from any later fact declarations in the obvious manner). |
|
27040 | 437 |
|
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\end{description} |
27040 | 439 |
|
440 |
Note that ``@{text "(\<IS> p\<^sub>1 \<dots> p\<^sub>n)"}'' patterns given |
|
441 |
in the syntax of @{element "assumes"} and @{element "defines"} above |
|
442 |
are illegal in locale definitions. In the long goal format of |
|
443 |
\secref{sec:goals}, term bindings may be included as expected, |
|
444 |
though. |
|
445 |
||
33846 | 446 |
\medskip Locale specifications are ``closed up'' by |
27040 | 447 |
turning the given text into a predicate definition @{text |
448 |
loc_axioms} and deriving the original assumptions as local lemmas |
|
449 |
(modulo local definitions). The predicate statement covers only the |
|
450 |
newly specified assumptions, omitting the content of included locale |
|
451 |
expressions. The full cumulative view is only provided on export, |
|
452 |
involving another predicate @{text loc} that refers to the complete |
|
453 |
specification text. |
|
454 |
||
455 |
In any case, the predicate arguments are those locale parameters |
|
456 |
that actually occur in the respective piece of text. Also note that |
|
457 |
these predicates operate at the meta-level in theory, but the locale |
|
458 |
packages attempts to internalize statements according to the |
|
459 |
object-logic setup (e.g.\ replacing @{text \<And>} by @{text \<forall>}, and |
|
460 |
@{text "\<Longrightarrow>"} by @{text "\<longrightarrow>"} in HOL; see also |
|
461 |
\secref{sec:object-logic}). Separate introduction rules @{text |
|
462 |
loc_axioms.intro} and @{text loc.intro} are provided as well. |
|
463 |
||
33867 | 464 |
\item @{command "print_locale"}~@{text "locale"} prints the |
465 |
contents of the named locale. The command omits @{element "notes"} |
|
466 |
elements by default. Use @{command "print_locale"}@{text "!"} to |
|
467 |
have them included. |
|
27040 | 468 |
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\item @{command "print_locales"} prints the names of all locales |
27040 | 470 |
of the current theory. |
471 |
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472 |
\item @{method intro_locales} and @{method unfold_locales} |
27040 | 473 |
repeatedly expand all introduction rules of locale predicates of the |
474 |
theory. While @{method intro_locales} only applies the @{text |
|
475 |
loc.intro} introduction rules and therefore does not decend to |
|
476 |
assumptions, @{method unfold_locales} is more aggressive and applies |
|
477 |
@{text loc_axioms.intro} as well. Both methods are aware of locale |
|
28787 | 478 |
specifications entailed by the context, both from target statements, |
479 |
and from interpretations (see below). New goals that are entailed |
|
480 |
by the current context are discharged automatically. |
|
27040 | 481 |
|
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482 |
\end{description} |
27040 | 483 |
*} |
484 |
||
485 |
||
33846 | 486 |
subsection {* Locale interpretations *} |
27040 | 487 |
|
488 |
text {* |
|
33846 | 489 |
Locale expressions may be instantiated, and the instantiated facts |
490 |
added to the current context. This requires a proof of the |
|
491 |
instantiated specification and is called \emph{locale |
|
492 |
interpretation}. Interpretation is possible in locales @{command |
|
493 |
"sublocale"}, theories (command @{command "interpretation"}) and |
|
494 |
also within a proof body (command @{command "interpret"}). |
|
27040 | 495 |
|
496 |
\begin{matharray}{rcl} |
|
33846 | 497 |
@{command_def "sublocale"} & : & @{text "theory \<rightarrow> proof(prove)"} \\ |
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@{command_def "interpretation"} & : & @{text "theory \<rightarrow> proof(prove)"} \\ |
33846 | 499 |
@{command_def "interpret"} & : & @{text "proof(state) | proof(chain) \<rightarrow> proof(prove)"} \\ |
500 |
@{command_def "print_interps"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
|
27040 | 501 |
\end{matharray} |
502 |
||
503 |
\indexouternonterm{interp} |
|
504 |
\begin{rail} |
|
33846 | 505 |
'sublocale' nameref ('<' | subseteq) localeexpr |
27040 | 506 |
; |
33846 | 507 |
'interpretation' localeepxr equations? |
27040 | 508 |
; |
38110 | 509 |
'interpret' localeexpr equations? |
27040 | 510 |
; |
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|
511 |
'print_interps' nameref |
33846 | 512 |
; |
513 |
equations: 'where' (thmdecl? prop + 'and') |
|
27040 | 514 |
; |
515 |
\end{rail} |
|
516 |
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\begin{description} |
27040 | 518 |
|
33846 | 519 |
\item @{command "sublocale"}~@{text "name \<subseteq> expr"} |
520 |
interprets @{text expr} in the locale @{text name}. A proof that |
|
521 |
the specification of @{text name} implies the specification of |
|
522 |
@{text expr} is required. As in the localized version of the |
|
523 |
theorem command, the proof is in the context of @{text name}. After |
|
524 |
the proof obligation has been dischared, the facts of @{text expr} |
|
525 |
become part of locale @{text name} as \emph{derived} context |
|
526 |
elements and are available when the context @{text name} is |
|
527 |
subsequently entered. Note that, like import, this is dynamic: |
|
528 |
facts added to a locale part of @{text expr} after interpretation |
|
529 |
become also available in @{text name}. |
|
27040 | 530 |
|
33846 | 531 |
Only specification fragments of @{text expr} that are not already |
532 |
part of @{text name} (be it imported, derived or a derived fragment |
|
533 |
of the import) are considered in this process. This enables |
|
534 |
circular interpretations to the extent that no infinite chains are |
|
535 |
generated in the locale hierarchy. |
|
27040 | 536 |
|
33846 | 537 |
If interpretations of @{text name} exist in the current theory, the |
538 |
command adds interpretations for @{text expr} as well, with the same |
|
539 |
qualifier, although only for fragments of @{text expr} that are not |
|
540 |
interpreted in the theory already. |
|
27040 | 541 |
|
33867 | 542 |
\item @{command "interpretation"}~@{text "expr \<WHERE> eqns"} |
33846 | 543 |
interprets @{text expr} in the theory. The command generates proof |
544 |
obligations for the instantiated specifications (assumes and defines |
|
545 |
elements). Once these are discharged by the user, instantiated |
|
546 |
facts are added to the theory in a post-processing phase. |
|
547 |
||
548 |
Additional equations, which are unfolded during |
|
27040 | 549 |
post-processing, may be given after the keyword @{keyword "where"}. |
550 |
This is useful for interpreting concepts introduced through |
|
551 |
definition specification elements. The equations must be proved. |
|
552 |
||
553 |
The command is aware of interpretations already active in the |
|
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|
554 |
theory, but does not simplify the goal automatically. In order to |
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|
555 |
simplify the proof obligations use methods @{method intro_locales} |
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|
556 |
or @{method unfold_locales}. Post-processing is not applied to |
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|
557 |
facts of interpretations that are already active. This avoids |
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|
558 |
duplication of interpreted facts, in particular. Note that, in the |
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|
559 |
case of a locale with import, parts of the interpretation may |
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|
560 |
already be active. The command will only process facts for new |
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|
561 |
parts. |
27040 | 562 |
|
563 |
Adding facts to locales has the effect of adding interpreted facts |
|
564 |
to the theory for all active interpretations also. That is, |
|
565 |
interpretations dynamically participate in any facts added to |
|
566 |
locales. |
|
567 |
||
38110 | 568 |
\item @{command "interpret"}~@{text "expr \<WHERE> eqns"} interprets |
569 |
@{text expr} in the proof context and is otherwise similar to |
|
570 |
interpretation in theories. Note that rewrite rules given to |
|
571 |
@{command "interpret"} should be explicitly universally quantified. |
|
27040 | 572 |
|
33867 | 573 |
\item @{command "print_interps"}~@{text "locale"} lists all |
38110 | 574 |
interpretations of @{text "locale"} in the current theory or proof |
575 |
context, including those due to a combination of a @{command |
|
576 |
"interpretation"} or @{command "interpret"} and one or several |
|
577 |
@{command "sublocale"} declarations. |
|
33867 | 578 |
|
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579 |
\end{description} |
27040 | 580 |
|
581 |
\begin{warn} |
|
582 |
Since attributes are applied to interpreted theorems, |
|
583 |
interpretation may modify the context of common proof tools, e.g.\ |
|
33867 | 584 |
the Simplifier or Classical Reasoner. As the behavior of such |
585 |
tools is \emph{not} stable under interpretation morphisms, manual |
|
586 |
declarations might have to be added to the target context of the |
|
587 |
interpretation to revert such declarations. |
|
27040 | 588 |
\end{warn} |
589 |
||
590 |
\begin{warn} |
|
38110 | 591 |
An interpretation in a theory or proof context may subsume previous |
27040 | 592 |
interpretations. This happens if the same specification fragment |
593 |
is interpreted twice and the instantiation of the second |
|
594 |
interpretation is more general than the interpretation of the |
|
33846 | 595 |
first. The locale package does not attempt to remove subsumed |
596 |
interpretations. |
|
27040 | 597 |
\end{warn} |
598 |
*} |
|
599 |
||
600 |
||
601 |
section {* Classes \label{sec:class} *} |
|
602 |
||
603 |
text {* |
|
604 |
A class is a particular locale with \emph{exactly one} type variable |
|
605 |
@{text \<alpha>}. Beyond the underlying locale, a corresponding type class |
|
606 |
is established which is interpreted logically as axiomatic type |
|
607 |
class \cite{Wenzel:1997:TPHOL} whose logical content are the |
|
608 |
assumptions of the locale. Thus, classes provide the full |
|
609 |
generality of locales combined with the commodity of type classes |
|
610 |
(notably type-inference). See \cite{isabelle-classes} for a short |
|
611 |
tutorial. |
|
612 |
||
613 |
\begin{matharray}{rcl} |
|
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614 |
@{command_def "class"} & : & @{text "theory \<rightarrow> local_theory"} \\ |
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|
615 |
@{command_def "instantiation"} & : & @{text "theory \<rightarrow> local_theory"} \\ |
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|
616 |
@{command_def "instance"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
31681 | 617 |
@{command_def "instance"} & : & @{text "theory \<rightarrow> proof(prove)"} \\ |
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618 |
@{command_def "subclass"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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|
619 |
@{command_def "print_classes"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
29706 | 620 |
@{command_def "class_deps"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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|
621 |
@{method_def intro_classes} & : & @{text method} \\ |
27040 | 622 |
\end{matharray} |
623 |
||
624 |
\begin{rail} |
|
625 |
'class' name '=' ((superclassexpr '+' (contextelem+)) | superclassexpr | (contextelem+)) \\ |
|
626 |
'begin'? |
|
627 |
; |
|
628 |
'instantiation' (nameref + 'and') '::' arity 'begin' |
|
629 |
; |
|
630 |
'instance' |
|
631 |
; |
|
31914 | 632 |
'instance' (nameref + 'and') '::' arity |
31681 | 633 |
; |
27040 | 634 |
'subclass' target? nameref |
635 |
; |
|
31681 | 636 |
'instance' nameref ('<' | subseteq) nameref |
637 |
; |
|
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|
638 |
'print_classes' |
27040 | 639 |
; |
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|
640 |
'class_deps' |
29706 | 641 |
; |
27040 | 642 |
|
643 |
superclassexpr: nameref | (nameref '+' superclassexpr) |
|
644 |
; |
|
645 |
\end{rail} |
|
646 |
||
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|
647 |
\begin{description} |
27040 | 648 |
|
28760
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|
649 |
\item @{command "class"}~@{text "c = superclasses + body"} defines |
27040 | 650 |
a new class @{text c}, inheriting from @{text superclasses}. This |
651 |
introduces a locale @{text c} with import of all locales @{text |
|
652 |
superclasses}. |
|
653 |
||
654 |
Any @{element "fixes"} in @{text body} are lifted to the global |
|
655 |
theory level (\emph{class operations} @{text "f\<^sub>1, \<dots>, |
|
656 |
f\<^sub>n"} of class @{text c}), mapping the local type parameter |
|
657 |
@{text \<alpha>} to a schematic type variable @{text "?\<alpha> :: c"}. |
|
658 |
||
659 |
Likewise, @{element "assumes"} in @{text body} are also lifted, |
|
660 |
mapping each local parameter @{text "f :: \<tau>[\<alpha>]"} to its |
|
661 |
corresponding global constant @{text "f :: \<tau>[?\<alpha> :: c]"}. The |
|
662 |
corresponding introduction rule is provided as @{text |
|
663 |
c_class_axioms.intro}. This rule should be rarely needed directly |
|
664 |
--- the @{method intro_classes} method takes care of the details of |
|
665 |
class membership proofs. |
|
666 |
||
28768
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diff
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|
667 |
\item @{command "instantiation"}~@{text "t :: (s\<^sub>1, \<dots>, s\<^sub>n)s |
28760
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|
668 |
\<BEGIN>"} opens a theory target (cf.\ \secref{sec:target}) which |
cbc435f7b16b
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changeset
|
669 |
allows to specify class operations @{text "f\<^sub>1, \<dots>, f\<^sub>n"} corresponding |
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|
670 |
to sort @{text s} at the particular type instance @{text "(\<alpha>\<^sub>1 :: s\<^sub>1, |
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|
671 |
\<dots>, \<alpha>\<^sub>n :: s\<^sub>n) t"}. A plain @{command "instance"} command in the |
cbc435f7b16b
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|
672 |
target body poses a goal stating these type arities. The target is |
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changeset
|
673 |
concluded by an @{command_ref (local) "end"} command. |
27040 | 674 |
|
675 |
Note that a list of simultaneous type constructors may be given; |
|
31914 | 676 |
this corresponds nicely to mutually recursive type definitions, e.g.\ |
27040 | 677 |
in Isabelle/HOL. |
678 |
||
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|
679 |
\item @{command "instance"} in an instantiation target body sets |
27040 | 680 |
up a goal stating the type arities claimed at the opening @{command |
681 |
"instantiation"}. The proof would usually proceed by @{method |
|
682 |
intro_classes}, and then establish the characteristic theorems of |
|
683 |
the type classes involved. After finishing the proof, the |
|
684 |
background theory will be augmented by the proven type arities. |
|
685 |
||
31681 | 686 |
On the theory level, @{command "instance"}~@{text "t :: (s\<^sub>1, \<dots>, |
687 |
s\<^sub>n)s"} provides a convenient way to instantiate a type class with no |
|
37112 | 688 |
need to specify operations: one can continue with the |
31681 | 689 |
instantiation proof immediately. |
690 |
||
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|
691 |
\item @{command "subclass"}~@{text c} in a class context for class |
27040 | 692 |
@{text d} sets up a goal stating that class @{text c} is logically |
693 |
contained in class @{text d}. After finishing the proof, class |
|
694 |
@{text d} is proven to be subclass @{text c} and the locale @{text |
|
695 |
c} is interpreted into @{text d} simultaneously. |
|
696 |
||
31681 | 697 |
A weakend form of this is available through a further variant of |
698 |
@{command instance}: @{command instance}~@{text "c\<^sub>1 \<subseteq> c\<^sub>2"} opens |
|
699 |
a proof that class @{text "c\<^isub>2"} implies @{text "c\<^isub>1"} without reference |
|
700 |
to the underlying locales; this is useful if the properties to prove |
|
701 |
the logical connection are not sufficent on the locale level but on |
|
702 |
the theory level. |
|
703 |
||
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changeset
|
704 |
\item @{command "print_classes"} prints all classes in the current |
27040 | 705 |
theory. |
706 |
||
29706 | 707 |
\item @{command "class_deps"} visualizes all classes and their |
708 |
subclass relations as a Hasse diagram. |
|
709 |
||
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changeset
|
710 |
\item @{method intro_classes} repeatedly expands all class |
27040 | 711 |
introduction rules of this theory. Note that this method usually |
712 |
needs not be named explicitly, as it is already included in the |
|
713 |
default proof step (e.g.\ of @{command "proof"}). In particular, |
|
714 |
instantiation of trivial (syntactic) classes may be performed by a |
|
715 |
single ``@{command ".."}'' proof step. |
|
26870 | 716 |
|
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|
717 |
\end{description} |
26870 | 718 |
*} |
719 |
||
27040 | 720 |
|
721 |
subsection {* The class target *} |
|
722 |
||
723 |
text {* |
|
724 |
%FIXME check |
|
725 |
||
726 |
A named context may refer to a locale (cf.\ \secref{sec:target}). |
|
727 |
If this locale is also a class @{text c}, apart from the common |
|
728 |
locale target behaviour the following happens. |
|
729 |
||
730 |
\begin{itemize} |
|
731 |
||
732 |
\item Local constant declarations @{text "g[\<alpha>]"} referring to the |
|
733 |
local type parameter @{text \<alpha>} and local parameters @{text "f[\<alpha>]"} |
|
734 |
are accompanied by theory-level constants @{text "g[?\<alpha> :: c]"} |
|
735 |
referring to theory-level class operations @{text "f[?\<alpha> :: c]"}. |
|
736 |
||
737 |
\item Local theorem bindings are lifted as are assumptions. |
|
738 |
||
739 |
\item Local syntax refers to local operations @{text "g[\<alpha>]"} and |
|
740 |
global operations @{text "g[?\<alpha> :: c]"} uniformly. Type inference |
|
741 |
resolves ambiguities. In rare cases, manual type annotations are |
|
742 |
needed. |
|
743 |
||
744 |
\end{itemize} |
|
745 |
*} |
|
746 |
||
747 |
||
37768
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diff
changeset
|
748 |
subsection {* Co-regularity of type classes and arities *} |
e86221f3bac7
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haftmann
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diff
changeset
|
749 |
|
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
750 |
text {* The class relation together with the collection of |
e86221f3bac7
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haftmann
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37112
diff
changeset
|
751 |
type-constructor arities must obey the principle of |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
752 |
\emph{co-regularity} as defined below. |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
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diff
changeset
|
753 |
|
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
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parents:
37112
diff
changeset
|
754 |
\medskip For the subsequent formulation of co-regularity we assume |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
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37112
diff
changeset
|
755 |
that the class relation is closed by transitivity and reflexivity. |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
756 |
Moreover the collection of arities @{text "t :: (\<^vec>s)c"} is |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
757 |
completed such that @{text "t :: (\<^vec>s)c"} and @{text "c \<subseteq> c'"} |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
758 |
implies @{text "t :: (\<^vec>s)c'"} for all such declarations. |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
759 |
|
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
760 |
Treating sorts as finite sets of classes (meaning the intersection), |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
761 |
the class relation @{text "c\<^sub>1 \<subseteq> c\<^sub>2"} is extended to sorts as |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
762 |
follows: |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
763 |
\[ |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
764 |
@{text "s\<^sub>1 \<subseteq> s\<^sub>2 \<equiv> \<forall>c\<^sub>2 \<in> s\<^sub>2. \<exists>c\<^sub>1 \<in> s\<^sub>1. c\<^sub>1 \<subseteq> c\<^sub>2"} |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
765 |
\] |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
766 |
|
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
767 |
This relation on sorts is further extended to tuples of sorts (of |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
768 |
the same length) in the component-wise way. |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
769 |
|
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
770 |
\smallskip Co-regularity of the class relation together with the |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
771 |
arities relation means: |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
772 |
\[ |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
773 |
@{text "t :: (\<^vec>s\<^sub>1)c\<^sub>1 \<Longrightarrow> t :: (\<^vec>s\<^sub>2)c\<^sub>2 \<Longrightarrow> c\<^sub>1 \<subseteq> c\<^sub>2 \<Longrightarrow> \<^vec>s\<^sub>1 \<subseteq> \<^vec>s\<^sub>2"} |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
774 |
\] |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
775 |
\noindent for all such arities. In other words, whenever the result |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
776 |
classes of some type-constructor arities are related, then the |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
777 |
argument sorts need to be related in the same way. |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
778 |
|
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
779 |
\medskip Co-regularity is a very fundamental property of the |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
780 |
order-sorted algebra of types. For example, it entails principle |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
781 |
types and most general unifiers, e.g.\ see \cite{nipkow-prehofer}. |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
782 |
*} |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
783 |
|
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
784 |
|
27040 | 785 |
section {* Unrestricted overloading *} |
786 |
||
787 |
text {* |
|
788 |
Isabelle/Pure's definitional schemes support certain forms of |
|
31047 | 789 |
overloading (see \secref{sec:consts}). Overloading means that a |
790 |
constant being declared as @{text "c :: \<alpha> decl"} may be |
|
791 |
defined separately on type instances |
|
792 |
@{text "c :: (\<beta>\<^sub>1, \<dots>, \<beta>\<^sub>n) t decl"} |
|
793 |
for each type constructor @{text t}. At most occassions |
|
27040 | 794 |
overloading will be used in a Haskell-like fashion together with |
795 |
type classes by means of @{command "instantiation"} (see |
|
796 |
\secref{sec:class}). Sometimes low-level overloading is desirable. |
|
797 |
The @{command "overloading"} target provides a convenient view for |
|
798 |
end-users. |
|
799 |
||
800 |
\begin{matharray}{rcl} |
|
28761
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
wenzelm
parents:
28760
diff
changeset
|
801 |
@{command_def "overloading"} & : & @{text "theory \<rightarrow> local_theory"} \\ |
27040 | 802 |
\end{matharray} |
803 |
||
804 |
\begin{rail} |
|
805 |
'overloading' \\ |
|
806 |
( string ( '==' | equiv ) term ( '(' 'unchecked' ')' )? + ) 'begin' |
|
807 |
\end{rail} |
|
808 |
||
28760
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unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
809 |
\begin{description} |
27040 | 810 |
|
28760
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
811 |
\item @{command "overloading"}~@{text "x\<^sub>1 \<equiv> c\<^sub>1 :: \<tau>\<^sub>1 \<AND> \<dots> x\<^sub>n \<equiv> c\<^sub>n :: \<tau>\<^sub>n \<BEGIN>"} |
27040 | 812 |
opens a theory target (cf.\ \secref{sec:target}) which allows to |
813 |
specify constants with overloaded definitions. These are identified |
|
28760
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
814 |
by an explicitly given mapping from variable names @{text "x\<^sub>i"} to |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
815 |
constants @{text "c\<^sub>i"} at particular type instances. The |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
816 |
definitions themselves are established using common specification |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
817 |
tools, using the names @{text "x\<^sub>i"} as reference to the |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
818 |
corresponding constants. The target is concluded by @{command |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
819 |
(local) "end"}. |
27040 | 820 |
|
821 |
A @{text "(unchecked)"} option disables global dependency checks for |
|
822 |
the corresponding definition, which is occasionally useful for |
|
31047 | 823 |
exotic overloading (see \secref{sec:consts} for a precise description). |
824 |
It is at the discretion of the user to avoid |
|
27040 | 825 |
malformed theory specifications! |
826 |
||
28760
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unified use of declaration environment with IsarImplementation;
wenzelm
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diff
changeset
|
827 |
\end{description} |
27040 | 828 |
*} |
829 |
||
830 |
||
831 |
section {* Incorporating ML code \label{sec:ML} *} |
|
832 |
||
833 |
text {* |
|
834 |
\begin{matharray}{rcl} |
|
28761
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
wenzelm
parents:
28760
diff
changeset
|
835 |
@{command_def "use"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
wenzelm
parents:
28760
diff
changeset
|
836 |
@{command_def "ML"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
wenzelm
parents:
28760
diff
changeset
|
837 |
@{command_def "ML_prf"} & : & @{text "proof \<rightarrow> proof"} \\ |
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
wenzelm
parents:
28760
diff
changeset
|
838 |
@{command_def "ML_val"} & : & @{text "any \<rightarrow>"} \\ |
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
wenzelm
parents:
28760
diff
changeset
|
839 |
@{command_def "ML_command"} & : & @{text "any \<rightarrow>"} \\ |
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
wenzelm
parents:
28760
diff
changeset
|
840 |
@{command_def "setup"} & : & @{text "theory \<rightarrow> theory"} \\ |
30461 | 841 |
@{command_def "local_setup"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
30526 | 842 |
@{command_def "attribute_setup"} & : & @{text "theory \<rightarrow> theory"} \\ |
28760
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
843 |
\end{matharray} |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
844 |
|
27040 | 845 |
\begin{rail} |
846 |
'use' name |
|
847 |
; |
|
40255
9ffbc25e1606
eliminated obsolete \_ escapes in rail environments;
wenzelm
parents:
40240
diff
changeset
|
848 |
('ML' | 'ML_prf' | 'ML_val' | 'ML_command' | 'setup' | 'local_setup') text |
27040 | 849 |
; |
40255
9ffbc25e1606
eliminated obsolete \_ escapes in rail environments;
wenzelm
parents:
40240
diff
changeset
|
850 |
'attribute_setup' name '=' text text |
30526 | 851 |
; |
27040 | 852 |
\end{rail} |
853 |
||
28760
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
854 |
\begin{description} |
27040 | 855 |
|
28760
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
28758
diff
changeset
|
856 |
\item @{command "use"}~@{text "file"} reads and executes ML |
27040 | 857 |
commands from @{text "file"}. The current theory context is passed |
30461 | 858 |
down to the ML toplevel and may be modified, using @{ML |
27040 | 859 |
"Context.>>"} or derived ML commands. The file name is checked with |
860 |
the @{keyword_ref "uses"} dependency declaration given in the theory |
|
861 |
header (see also \secref{sec:begin-thy}). |
|
28281 | 862 |
|
863 |
Top-level ML bindings are stored within the (global or local) theory |
|
864 |
context. |
|
27040 | 865 |
|
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|
866 |
\item @{command "ML"}~@{text "text"} is similar to @{command "use"}, |
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|
867 |
but executes ML commands directly from the given @{text "text"}. |
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|
868 |
Top-level ML bindings are stored within the (global or local) theory |
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|
869 |
context. |
28281 | 870 |
|
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|
871 |
\item @{command "ML_prf"} is analogous to @{command "ML"} but works |
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changeset
|
872 |
within a proof context. |
28281 | 873 |
|
874 |
Top-level ML bindings are stored within the proof context in a |
|
875 |
purely sequential fashion, disregarding the nested proof structure. |
|
876 |
ML bindings introduced by @{command "ML_prf"} are discarded at the |
|
877 |
end of the proof. |
|
27040 | 878 |
|
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|
879 |
\item @{command "ML_val"} and @{command "ML_command"} are diagnostic |
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changeset
|
880 |
versions of @{command "ML"}, which means that the context may not be |
cbc435f7b16b
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changeset
|
881 |
updated. @{command "ML_val"} echos the bindings produced at the ML |
cbc435f7b16b
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changeset
|
882 |
toplevel, but @{command "ML_command"} is silent. |
27040 | 883 |
|
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|
884 |
\item @{command "setup"}~@{text "text"} changes the current theory |
27040 | 885 |
context by applying @{text "text"}, which refers to an ML expression |
30461 | 886 |
of type @{ML_type "theory -> theory"}. This enables to initialize |
887 |
any object-logic specific tools and packages written in ML, for |
|
888 |
example. |
|
889 |
||
890 |
\item @{command "local_setup"} is similar to @{command "setup"} for |
|
891 |
a local theory context, and an ML expression of type @{ML_type |
|
892 |
"local_theory -> local_theory"}. This allows to |
|
893 |
invoke local theory specification packages without going through |
|
894 |
concrete outer syntax, for example. |
|
28758 | 895 |
|
30526 | 896 |
\item @{command "attribute_setup"}~@{text "name = text description"} |
897 |
defines an attribute in the current theory. The given @{text |
|
898 |
"text"} has to be an ML expression of type |
|
899 |
@{ML_type "attribute context_parser"}, cf.\ basic parsers defined in |
|
900 |
structure @{ML_struct Args} and @{ML_struct Attrib}. |
|
901 |
||
902 |
In principle, attributes can operate both on a given theorem and the |
|
903 |
implicit context, although in practice only one is modified and the |
|
904 |
other serves as parameter. Here are examples for these two cases: |
|
905 |
||
906 |
\end{description} |
|
907 |
*} |
|
908 |
||
909 |
attribute_setup my_rule = {* |
|
910 |
Attrib.thms >> (fn ths => |
|
911 |
Thm.rule_attribute (fn context: Context.generic => fn th: thm => |
|
912 |
let val th' = th OF ths |
|
913 |
in th' end)) *} "my rule" |
|
914 |
||
30546 | 915 |
attribute_setup my_declaration = {* |
30526 | 916 |
Attrib.thms >> (fn ths => |
917 |
Thm.declaration_attribute (fn th: thm => fn context: Context.generic => |
|
918 |
let val context' = context |
|
919 |
in context' end)) *} "my declaration" |
|
920 |
||
27040 | 921 |
|
922 |
section {* Primitive specification elements *} |
|
923 |
||
924 |
subsection {* Type classes and sorts \label{sec:classes} *} |
|
925 |
||
926 |
text {* |
|
927 |
\begin{matharray}{rcll} |
|
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|
928 |
@{command_def "classes"} & : & @{text "theory \<rightarrow> theory"} \\ |
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|
929 |
@{command_def "classrel"} & : & @{text "theory \<rightarrow> theory"} & (axiomatic!) \\ |
37768
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moved co-regularity to class section; avoid duplicated class_deps
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changeset
|
930 |
@{command_def "default_sort"} & : & @{text "local_theory \<rightarrow> local_theory"} |
27040 | 931 |
\end{matharray} |
932 |
||
933 |
\begin{rail} |
|
934 |
'classes' (classdecl +) |
|
935 |
; |
|
936 |
'classrel' (nameref ('<' | subseteq) nameref + 'and') |
|
937 |
; |
|
40255
9ffbc25e1606
eliminated obsolete \_ escapes in rail environments;
wenzelm
parents:
40240
diff
changeset
|
938 |
'default_sort' sort |
27040 | 939 |
; |
940 |
\end{rail} |
|
941 |
||
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changeset
|
942 |
\begin{description} |
27040 | 943 |
|
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changeset
|
944 |
\item @{command "classes"}~@{text "c \<subseteq> c\<^sub>1, \<dots>, c\<^sub>n"} declares class |
cbc435f7b16b
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changeset
|
945 |
@{text c} to be a subclass of existing classes @{text "c\<^sub>1, \<dots>, c\<^sub>n"}. |
28767 | 946 |
Isabelle implicitly maintains the transitive closure of the class |
947 |
hierarchy. Cyclic class structures are not permitted. |
|
27040 | 948 |
|
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changeset
|
949 |
\item @{command "classrel"}~@{text "c\<^sub>1 \<subseteq> c\<^sub>2"} states subclass |
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changeset
|
950 |
relations between existing classes @{text "c\<^sub>1"} and @{text "c\<^sub>2"}. |
37768
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
951 |
This is done axiomatically! The @{command_ref "subclass"} and |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
952 |
@{command_ref "instance"} commands (see \secref{sec:class}) provide |
e86221f3bac7
moved co-regularity to class section; avoid duplicated class_deps
haftmann
parents:
37112
diff
changeset
|
953 |
a way to introduce proven class relations. |
27040 | 954 |
|
36454
f2b5bcc61a8c
command 'defaultsort' is renamed to 'default_sort', it works within a local theory context;
wenzelm
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diff
changeset
|
955 |
\item @{command "default_sort"}~@{text s} makes sort @{text s} the |
28767 | 956 |
new default sort for any type variable that is given explicitly in |
957 |
the text, but lacks a sort constraint (wrt.\ the current context). |
|
958 |
Type variables generated by type inference are not affected. |
|
959 |
||
960 |
Usually the default sort is only changed when defining a new |
|
961 |
object-logic. For example, the default sort in Isabelle/HOL is |
|
39831 | 962 |
@{class type}, the class of all HOL types. |
28767 | 963 |
|
964 |
When merging theories, the default sorts of the parents are |
|
965 |
logically intersected, i.e.\ the representations as lists of classes |
|
966 |
are joined. |
|
27040 | 967 |
|
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changeset
|
968 |
\end{description} |
27040 | 969 |
*} |
970 |
||
971 |
||
972 |
subsection {* Types and type abbreviations \label{sec:types-pure} *} |
|
973 |
||
974 |
text {* |
|
975 |
\begin{matharray}{rcll} |
|
36178
0e5c133b48b6
keep localized 'types' as regular non-old-style version -- 'type_abbrev' as 'type' just causes too many problems, e.g. clash with "type" in translations or "type:" argument syntax;
wenzelm
parents:
36177
diff
changeset
|
976 |
@{command_def "types"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
35681 | 977 |
@{command_def "typedecl"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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changeset
|
978 |
@{command_def "arities"} & : & @{text "theory \<rightarrow> theory"} & (axiomatic!) \\ |
27040 | 979 |
\end{matharray} |
980 |
||
981 |
\begin{rail} |
|
35351
7425aece4ee3
allow general mixfix syntax for type constructors;
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parents:
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diff
changeset
|
982 |
'types' (typespec '=' type mixfix? +) |
27040 | 983 |
; |
35351
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diff
changeset
|
984 |
'typedecl' typespec mixfix? |
27040 | 985 |
; |
986 |
'arities' (nameref '::' arity +) |
|
987 |
; |
|
988 |
\end{rail} |
|
989 |
||
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changeset
|
990 |
\begin{description} |
27040 | 991 |
|
28767 | 992 |
\item @{command "types"}~@{text "(\<alpha>\<^sub>1, \<dots>, \<alpha>\<^sub>n) t = \<tau>"} introduces a |
993 |
\emph{type synonym} @{text "(\<alpha>\<^sub>1, \<dots>, \<alpha>\<^sub>n) t"} for the existing type |
|
994 |
@{text "\<tau>"}. Unlike actual type definitions, as are available in |
|
995 |
Isabelle/HOL for example, type synonyms are merely syntactic |
|
28760
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parents:
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changeset
|
996 |
abbreviations without any logical significance. Internally, type |
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unified use of declaration environment with IsarImplementation;
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changeset
|
997 |
synonyms are fully expanded. |
27040 | 998 |
|
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changeset
|
999 |
\item @{command "typedecl"}~@{text "(\<alpha>\<^sub>1, \<dots>, \<alpha>\<^sub>n) t"} declares a new |
28767 | 1000 |
type constructor @{text t}. If the object-logic defines a base sort |
1001 |
@{text s}, then the constructor is declared to operate on that, via |
|
1002 |
the axiomatic specification @{command arities}~@{text "t :: (s, \<dots>, |
|
28768
a056077b65a1
added section "Co-regularity of type classes and arities" (variant from old ref manual);
wenzelm
parents:
28767
diff
changeset
|
1003 |
s)s"}. |
27040 | 1004 |
|
28768
a056077b65a1
added section "Co-regularity of type classes and arities" (variant from old ref manual);
wenzelm
parents:
28767
diff
changeset
|
1005 |
\item @{command "arities"}~@{text "t :: (s\<^sub>1, \<dots>, s\<^sub>n)s"} augments |
28760
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
1006 |
Isabelle's order-sorted signature of types by new type constructor |
35282
8fd9d555d04d
dropped references to old axclass from documentation
haftmann
parents:
33867
diff
changeset
|
1007 |
arities. This is done axiomatically! The @{command_ref "instantiation"} |
8fd9d555d04d
dropped references to old axclass from documentation
haftmann
parents:
33867
diff
changeset
|
1008 |
target (see \secref{sec:class}) provides a way to introduce |
28768
a056077b65a1
added section "Co-regularity of type classes and arities" (variant from old ref manual);
wenzelm
parents:
28767
diff
changeset
|
1009 |
proven type arities. |
27040 | 1010 |
|
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changeset
|
1011 |
\end{description} |
27040 | 1012 |
*} |
1013 |
||
1014 |
||
1015 |
subsection {* Constants and definitions \label{sec:consts} *} |
|
1016 |
||
1017 |
text {* |
|
1018 |
Definitions essentially express abbreviations within the logic. The |
|
1019 |
simplest form of a definition is @{text "c :: \<sigma> \<equiv> t"}, where @{text |
|
1020 |
c} is a newly declared constant. Isabelle also allows derived forms |
|
1021 |
where the arguments of @{text c} appear on the left, abbreviating a |
|
1022 |
prefix of @{text \<lambda>}-abstractions, e.g.\ @{text "c \<equiv> \<lambda>x y. t"} may be |
|
1023 |
written more conveniently as @{text "c x y \<equiv> t"}. Moreover, |
|
1024 |
definitions may be weakened by adding arbitrary pre-conditions: |
|
1025 |
@{text "A \<Longrightarrow> c x y \<equiv> t"}. |
|
1026 |
||
1027 |
\medskip The built-in well-formedness conditions for definitional |
|
1028 |
specifications are: |
|
1029 |
||
1030 |
\begin{itemize} |
|
1031 |
||
1032 |
\item Arguments (on the left-hand side) must be distinct variables. |
|
1033 |
||
1034 |
\item All variables on the right-hand side must also appear on the |
|
1035 |
left-hand side. |
|
1036 |
||
1037 |
\item All type variables on the right-hand side must also appear on |
|
1038 |
the left-hand side; this prohibits @{text "0 :: nat \<equiv> length ([] :: |
|
1039 |
\<alpha> list)"} for example. |
|
1040 |
||
1041 |
\item The definition must not be recursive. Most object-logics |
|
1042 |
provide definitional principles that can be used to express |
|
1043 |
recursion safely. |
|
1044 |
||
1045 |
\end{itemize} |
|
1046 |
||
31047 | 1047 |
The right-hand side of overloaded definitions may mention overloaded constants |
27040 | 1048 |
recursively at type instances corresponding to the immediate |
1049 |
argument types @{text "\<beta>\<^sub>1, \<dots>, \<beta>\<^sub>n"}. Incomplete |
|
1050 |
specification patterns impose global constraints on all occurrences, |
|
1051 |
e.g.\ @{text "d :: \<alpha> \<times> \<alpha>"} on the left-hand side means that all |
|
1052 |
corresponding occurrences on some right-hand side need to be an |
|
1053 |
instance of this, general @{text "d :: \<alpha> \<times> \<beta>"} will be disallowed. |
|
1054 |
||
1055 |
\begin{matharray}{rcl} |
|
28761
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wenzelm
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diff
changeset
|
1056 |
@{command_def "consts"} & : & @{text "theory \<rightarrow> theory"} \\ |
9ec4482c9201
updated/refined types of Isar language elements, removed special LaTeX macros;
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parents:
28760
diff
changeset
|
1057 |
@{command_def "defs"} & : & @{text "theory \<rightarrow> theory"} \\ |
27040 | 1058 |
\end{matharray} |
1059 |
||
1060 |
\begin{rail} |
|
1061 |
'consts' ((name '::' type mixfix?) +) |
|
1062 |
; |
|
1063 |
'defs' ('(' 'unchecked'? 'overloaded'? ')')? \\ (axmdecl prop +) |
|
1064 |
; |
|
1065 |
\end{rail} |
|
1066 |
||
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changeset
|
1067 |
\begin{description} |
27040 | 1068 |
|
28760
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diff
changeset
|
1069 |
\item @{command "consts"}~@{text "c :: \<sigma>"} declares constant @{text |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
1070 |
c} to have any instance of type scheme @{text \<sigma>}. The optional |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
1071 |
mixfix annotations may attach concrete syntax to the constants |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
1072 |
declared. |
27040 | 1073 |
|
28760
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changeset
|
1074 |
\item @{command "defs"}~@{text "name: eqn"} introduces @{text eqn} |
27040 | 1075 |
as a definitional axiom for some existing constant. |
1076 |
||
1077 |
The @{text "(unchecked)"} option disables global dependency checks |
|
1078 |
for this definition, which is occasionally useful for exotic |
|
1079 |
overloading. It is at the discretion of the user to avoid malformed |
|
1080 |
theory specifications! |
|
1081 |
||
1082 |
The @{text "(overloaded)"} option declares definitions to be |
|
1083 |
potentially overloaded. Unless this option is given, a warning |
|
1084 |
message would be issued for any definitional equation with a more |
|
1085 |
special type than that of the corresponding constant declaration. |
|
1086 |
||
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changeset
|
1087 |
\end{description} |
27040 | 1088 |
*} |
1089 |
||
1090 |
||
1091 |
section {* Axioms and theorems \label{sec:axms-thms} *} |
|
1092 |
||
1093 |
text {* |
|
1094 |
\begin{matharray}{rcll} |
|
28761
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changeset
|
1095 |
@{command_def "axioms"} & : & @{text "theory \<rightarrow> theory"} & (axiomatic!) \\ |
9ec4482c9201
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wenzelm
parents:
28760
diff
changeset
|
1096 |
@{command_def "lemmas"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
9ec4482c9201
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wenzelm
parents:
28760
diff
changeset
|
1097 |
@{command_def "theorems"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
27040 | 1098 |
\end{matharray} |
1099 |
||
1100 |
\begin{rail} |
|
1101 |
'axioms' (axmdecl prop +) |
|
1102 |
; |
|
1103 |
('lemmas' | 'theorems') target? (thmdef? thmrefs + 'and') |
|
1104 |
; |
|
1105 |
\end{rail} |
|
1106 |
||
28760
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|
1107 |
\begin{description} |
27040 | 1108 |
|
28760
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wenzelm
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diff
changeset
|
1109 |
\item @{command "axioms"}~@{text "a: \<phi>"} introduces arbitrary |
27040 | 1110 |
statements as axioms of the meta-logic. In fact, axioms are |
1111 |
``axiomatic theorems'', and may be referred later just as any other |
|
1112 |
theorem. |
|
1113 |
||
1114 |
Axioms are usually only introduced when declaring new logical |
|
1115 |
systems. Everyday work is typically done the hard way, with proper |
|
1116 |
definitions and proven theorems. |
|
1117 |
||
28760
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wenzelm
parents:
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diff
changeset
|
1118 |
\item @{command "lemmas"}~@{text "a = b\<^sub>1 \<dots> b\<^sub>n"} retrieves and stores |
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unified use of declaration environment with IsarImplementation;
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changeset
|
1119 |
existing facts in the theory context, or the specified target |
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unified use of declaration environment with IsarImplementation;
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diff
changeset
|
1120 |
context (see also \secref{sec:target}). Typical applications would |
cbc435f7b16b
unified use of declaration environment with IsarImplementation;
wenzelm
parents:
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diff
changeset
|
1121 |
also involve attributes, to declare Simplifier rules, for example. |
27040 | 1122 |
|
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changeset
|
1123 |
\item @{command "theorems"} is essentially the same as @{command |
27040 | 1124 |
"lemmas"}, but marks the result as a different kind of facts. |
1125 |
||
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1126 |
\end{description} |
27040 | 1127 |
*} |
1128 |
||
1129 |
||
1130 |
section {* Oracles *} |
|
1131 |
||
28756 | 1132 |
text {* Oracles allow Isabelle to take advantage of external reasoners |
1133 |
such as arithmetic decision procedures, model checkers, fast |
|
1134 |
tautology checkers or computer algebra systems. Invoked as an |
|
1135 |
oracle, an external reasoner can create arbitrary Isabelle theorems. |
|
1136 |
||
1137 |
It is the responsibility of the user to ensure that the external |
|
1138 |
reasoner is as trustworthy as the application requires. Another |
|
1139 |
typical source of errors is the linkup between Isabelle and the |
|
1140 |
external tool, not just its concrete implementation, but also the |
|
1141 |
required translation between two different logical environments. |
|
1142 |
||
1143 |
Isabelle merely guarantees well-formedness of the propositions being |
|
1144 |
asserted, and records within the internal derivation object how |
|
1145 |
presumed theorems depend on unproven suppositions. |
|
1146 |
||
40240 | 1147 |
\begin{matharray}{rcll} |
1148 |
@{command_def "oracle"} & : & @{text "theory \<rightarrow> theory"} & (axiomatic!) \\ |
|
27040 | 1149 |
\end{matharray} |
1150 |
||
1151 |
\begin{rail} |
|
28290 | 1152 |
'oracle' name '=' text |
27040 | 1153 |
; |
1154 |
\end{rail} |
|
1155 |
||
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1156 |
\begin{description} |
27040 | 1157 |
|
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1158 |
\item @{command "oracle"}~@{text "name = text"} turns the given ML |
28290 | 1159 |
expression @{text "text"} of type @{ML_text "'a -> cterm"} into an |
1160 |
ML function of type @{ML_text "'a -> thm"}, which is bound to the |
|
28756 | 1161 |
global identifier @{ML_text name}. This acts like an infinitary |
1162 |
specification of axioms! Invoking the oracle only works within the |
|
1163 |
scope of the resulting theory. |
|
27040 | 1164 |
|
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|
1165 |
\end{description} |
28756 | 1166 |
|
40239
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|
1167 |
See @{"file" "~~/src/HOL/ex/Iff_Oracle.thy"} for a worked example of |
28756 | 1168 |
defining a new primitive rule as oracle, and turning it into a proof |
1169 |
method. |
|
27040 | 1170 |
*} |
1171 |
||
1172 |
||
1173 |
section {* Name spaces *} |
|
1174 |
||
1175 |
text {* |
|
1176 |
\begin{matharray}{rcl} |
|
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|
1177 |
@{command_def "hide_class"} & : & @{text "theory \<rightarrow> theory"} \\ |
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|
1178 |
@{command_def "hide_type"} & : & @{text "theory \<rightarrow> theory"} \\ |
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|
1179 |
@{command_def "hide_const"} & : & @{text "theory \<rightarrow> theory"} \\ |
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|
1180 |
@{command_def "hide_fact"} & : & @{text "theory \<rightarrow> theory"} \\ |
27040 | 1181 |
\end{matharray} |
1182 |
||
1183 |
\begin{rail} |
|
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|
1184 |
( 'hide_class' | 'hide_type' | 'hide_const' | 'hide_fact' ) ('(open)')? (nameref + ) |
27040 | 1185 |
; |
1186 |
\end{rail} |
|
1187 |
||
1188 |
Isabelle organizes any kind of name declarations (of types, |
|
1189 |
constants, theorems etc.) by separate hierarchically structured name |
|
1190 |
spaces. Normally the user does not have to control the behavior of |
|
1191 |
name spaces by hand, yet the following commands provide some way to |
|
1192 |
do so. |
|
1193 |
||
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1194 |
\begin{description} |
27040 | 1195 |
|
36177
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|
1196 |
\item @{command "hide_class"}~@{text names} fully removes class |
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|
1197 |
declarations from a given name space; with the @{text "(open)"} |
39977
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krauss
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|
1198 |
option, only the base name is hidden. |
36177
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changeset
|
1199 |
|
27040 | 1200 |
Note that hiding name space accesses has no impact on logical |
28756 | 1201 |
declarations --- they remain valid internally. Entities that are no |
27040 | 1202 |
longer accessible to the user are printed with the special qualifier |
1203 |
``@{text "??"}'' prefixed to the full internal name. |
|
1204 |
||
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changeset
|
1205 |
\item @{command "hide_type"}, @{command "hide_const"}, and @{command |
8e0770d2e499
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changeset
|
1206 |
"hide_fact"} are similar to @{command "hide_class"}, but hide types, |
8e0770d2e499
separate commands 'hide_class', 'hide_type', 'hide_const', 'hide_fact';
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changeset
|
1207 |
constants, and facts, respectively. |
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changeset
|
1208 |
|
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|
1209 |
\end{description} |
27040 | 1210 |
*} |
1211 |
||
26869 | 1212 |
end |