theory Misc

imports Main

begin

chapter {* Other commands *}

section {* Inspecting the context *}

text {*

  \begin{matharray}{rcl}

    @{command_def "print_commands"}@{text "\<^sup>*"} & : & @{text "any \<rightarrow>"} \\

    @{command_def "print_theory"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "print_methods"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "print_attributes"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "print_theorems"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "find_theorems"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "find_consts"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "thm_deps"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "print_facts"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

    @{command_def "print_binds"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\

  \end{matharray}

  \begin{rail}

    ('print\_theory' | 'print\_theorems') ('!'?)

    ;

    'find\_theorems' (('(' (nat)? ('with\_dups')? ')')?) (thmcriterion *)

    ;

    thmcriterion: ('-'?) ('name' ':' nameref | 'intro' | 'elim' | 'dest' |

      'solves' | 'simp' ':' term | term)

    ;

    'find\_consts' (constcriterion *)

    ;

    constcriterion: ('-'?) ('name' ':' nameref | 'strict' ':' type | type)

    ;

    'thm\_deps' thmrefs

    ;

  \end{rail}

  These commands print certain parts of the theory and proof context.

  Note that there are some further ones available, such as for the set

  of rules declared for simplifications.

  \begin{description}

  \item @{command "print_commands"} prints Isabelle's outer theory

  syntax, including keywords and command.

  \item @{command "print_theory"} prints the main logical content of

  the theory context; the ``@{text "!"}'' option indicates extra

  verbosity.

  \item @{command "print_methods"} prints all proof methods

  available in the current theory context.

  \item @{command "print_attributes"} prints all attributes

  available in the current theory context.

  \item @{command "print_theorems"} prints theorems resulting from the

  last command; the ``@{text "!"}'' option indicates extra verbosity.

  \item @{command "find_theorems"}~@{text criteria} retrieves facts

  from the theory or proof context matching all of given search

  criteria.  The criterion @{text "name: p"} selects all theorems

  whose fully qualified name matches pattern @{text p}, which may

  contain ``@{text "*"}'' wildcards.  The criteria @{text intro},

  @{text elim}, and @{text dest} select theorems that match the

  current goal as introduction, elimination or destruction rules,

  respectively.  The criterion @{text "solves"} returns all rules

  that would directly solve the current goal.  The criterion

  @{text "simp: t"} selects all rewrite rules whose left-hand side

  matches the given term.  The criterion term @{text t} selects all

  theorems that contain the pattern @{text t} -- as usual, patterns

  may contain occurrences of the dummy ``@{text _}'', schematic

  variables, and type constraints.

  Criteria can be preceded by ``@{text "-"}'' to select theorems that

  do \emph{not} match. Note that giving the empty list of criteria

  yields \emph{all} currently known facts.  An optional limit for the

  number of printed facts may be given; the default is 40.  By

  default, duplicates are removed from the search result. Use

  @{text with_dups} to display duplicates.

  \item @{command "find_consts"}~@{text criteria} prints all constants

  whose type meets all of the given criteria. The criterion @{text

  "strict: ty"} is met by any type that matches the type pattern

  @{text ty}.  Patterns may contain both the dummy type ``@{text _}''

  and sort constraints. The criterion @{text ty} is similar, but it

  also matches against subtypes. The criterion @{text "name: p"} and

  the prefix ``@{text "-"}'' function as described for @{command

  "find_theorems"}.

  \item @{command "thm_deps"}~@{text "a\<^sub>1 \<dots> a\<^sub>n"}

  visualizes dependencies of facts, using Isabelle's graph browser

  tool (see also \cite{isabelle-sys}).

  \item @{command "print_facts"} prints all local facts of the

  current context, both named and unnamed ones.

  \item @{command "print_binds"} prints all term abbreviations

  present in the context.

  \end{description}

*}

section {* History commands \label{sec:history} *}

text {*

  \begin{matharray}{rcl}

    @{command_def "undo"}^{{ * }{ * }} & : & @{text "any \<rightarrow> any"} \\

    @{command_def "linear_undo"}^{{ * }{ * }} & : & @{text "any \<rightarrow> any"} \\

    @{command_def "kill"}^{{ * }{ * }} & : & @{text "any \<rightarrow> any"} \\

  \end{matharray}

  The Isabelle/Isar top-level maintains a two-stage history, for

  theory and proof state transformation.  Basically, any command can

  be undone using @{command "undo"}, excluding mere diagnostic

  elements.  Note that a theorem statement with a \emph{finished}

  proof is treated as a single unit by @{command "undo"}.  In

  contrast, the variant @{command "linear_undo"} admits to step back

  into the middle of a proof.  The @{command "kill"} command aborts

  the current history node altogether, discontinuing a proof or even

  the whole theory.  This operation is \emph{not} undo-able.

  \begin{warn}

    History commands should never be used with user interfaces such as

    Proof~General \cite{proofgeneral,Aspinall:TACAS:2000}, which takes

    care of stepping forth and back itself.  Interfering by manual

    @{command "undo"}, @{command "linear_undo"}, or even @{command

    "kill"} commands would quickly result in utter confusion.

  \end{warn}

*}

section {* System commands *}

text {*

  \begin{matharray}{rcl}

    @{command_def "cd"}@{text "\<^sup>*"} & : & @{text "any \<rightarrow>"} \\

    @{command_def "pwd"}@{text "\<^sup>*"} & : & @{text "any \<rightarrow>"} \\

    @{command_def "use_thy"}@{text "\<^sup>*"} & : & @{text "any \<rightarrow>"} \\

  \end{matharray}

  \begin{rail}

    ('cd' | 'use\_thy' | 'update\_thy') name

    ;

  \end{rail}

  \begin{description}

  \item @{command "cd"}~@{text path} changes the current directory

  of the Isabelle process.

  \item @{command "pwd"} prints the current working directory.

  \item @{command "use_thy"}~@{text A} preload theory @{text A}.

  These system commands are scarcely used when working interactively,

  since loading of theories is done automatically as required.

  \end{description}

*}

end