author | wenzelm |
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changeset 36747 | 7361d5dde9ce |
parent 36745 | 403585a89772 |
child 38980 | af73cf0dc31f |
permissions | -rw-r--r-- |
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theory Inner_Syntax |
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imports Main |
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begin |
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chapter {* Inner syntax --- the term language \label{ch:inner-syntax} *} |
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section {* Printing logical entities *} |
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subsection {* Diagnostic commands *} |
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text {* |
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\begin{matharray}{rcl} |
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@{command_def "typ"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{command_def "term"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{command_def "prop"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{command_def "thm"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{command_def "prf"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{command_def "full_prf"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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@{command_def "pr"}@{text "\<^sup>*"} & : & @{text "any \<rightarrow>"} \\ |
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\end{matharray} |
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These diagnostic commands assist interactive development by printing |
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internal logical entities in a human-readable fashion. |
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\begin{rail} |
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'typ' modes? type |
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'term' modes? term |
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; |
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'prop' modes? prop |
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; |
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'thm' modes? thmrefs |
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; |
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( 'prf' | 'full\_prf' ) modes? thmrefs? |
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; |
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'pr' modes? nat? (',' nat)? |
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; |
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modes: '(' (name + ) ')' |
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; |
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\end{rail} |
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\begin{description} |
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\item @{command "typ"}~@{text \<tau>} reads and prints types of the |
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meta-logic according to the current theory or proof context. |
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\item @{command "term"}~@{text t} and @{command "prop"}~@{text \<phi>} |
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read, type-check and print terms or propositions according to the |
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current theory or proof context; the inferred type of @{text t} is |
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output as well. Note that these commands are also useful in |
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inspecting the current environment of term abbreviations. |
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\item @{command "thm"}~@{text "a\<^sub>1 \<dots> a\<^sub>n"} retrieves |
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theorems from the current theory or proof context. Note that any |
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attributes included in the theorem specifications are applied to a |
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temporary context derived from the current theory or proof; the |
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result is discarded, i.e.\ attributes involved in @{text "a\<^sub>1, |
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\<dots>, a\<^sub>n"} do not have any permanent effect. |
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\item @{command "prf"} displays the (compact) proof term of the |
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current proof state (if present), or of the given theorems. Note |
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that this requires proof terms to be switched on for the current |
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object logic (see the ``Proof terms'' section of the Isabelle |
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reference manual for information on how to do this). |
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\item @{command "full_prf"} is like @{command "prf"}, but displays |
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the full proof term, i.e.\ also displays information omitted in the |
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compact proof term, which is denoted by ``@{text _}'' placeholders |
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there. |
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\item @{command "pr"}~@{text "goals, prems"} prints the current |
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proof state (if present), including the proof context, current facts |
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and goals. The optional limit arguments affect the number of goals |
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and premises to be displayed, which is initially 10 for both. |
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Omitting limit values leaves the current setting unchanged. |
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\end{description} |
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All of the diagnostic commands above admit a list of @{text modes} |
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to be specified, which is appended to the current print mode (see |
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also \cite{isabelle-ref}). Thus the output behavior may be modified |
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according particular print mode features. For example, @{command |
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"pr"}~@{text "(latex xsymbols)"} would print the current proof state |
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with mathematical symbols and special characters represented in |
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{\LaTeX} source, according to the Isabelle style |
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\cite{isabelle-sys}. |
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Note that antiquotations (cf.\ \secref{sec:antiq}) provide a more |
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systematic way to include formal items into the printed text |
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document. |
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*} |
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subsection {* Details of printed content *} |
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text {* |
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\begin{mldecls} |
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@{index_ML show_types: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML show_sorts: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML show_consts: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML long_names: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML short_names: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML unique_names: "bool Unsynchronized.ref"} & default @{ML true} \\ |
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@{index_ML show_brackets: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML eta_contract: "bool Unsynchronized.ref"} & default @{ML true} \\ |
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@{index_ML goals_limit: "int Unsynchronized.ref"} & default @{ML 10} \\ |
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@{index_ML Proof.show_main_goal: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML show_hyps: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML show_tags: "bool Unsynchronized.ref"} & default @{ML false} \\ |
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@{index_ML show_question_marks: "bool Unsynchronized.ref"} & default @{ML true} \\ |
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\end{mldecls} |
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These global ML variables control the detail of information that is |
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displayed for types, terms, theorems, goals etc. |
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In interactive sessions, the user interface usually manages these |
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global parameters of the Isabelle process, even with some concept of |
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persistence. Nonetheless it is occasionally useful to manipulate ML |
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variables directly, e.g.\ using @{command "ML_val"} or @{command |
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"ML_command"}. |
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Batch-mode logic sessions may be configured by putting appropriate |
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ML text directly into the @{verbatim ROOT.ML} file. |
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\begin{description} |
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\item @{ML show_types} and @{ML show_sorts} control printing of type |
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constraints for term variables, and sort constraints for type |
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variables. By default, neither of these are shown in output. If |
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@{ML show_sorts} is set to @{ML true}, types are always shown as |
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well. |
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Note that displaying types and sorts may explain why a polymorphic |
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inference rule fails to resolve with some goal, or why a rewrite |
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rule does not apply as expected. |
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\item @{ML show_consts} controls printing of types of constants when |
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displaying a goal state. |
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Note that the output can be enormous, because polymorphic constants |
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often occur at several different type instances. |
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\item @{ML long_names}, @{ML short_names}, and @{ML unique_names} |
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control the way of printing fully qualified internal names in |
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external form. See also \secref{sec:antiq} for the document |
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antiquotation options of the same names. |
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\item @{ML show_brackets} controls bracketing in pretty printed |
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output. If set to @{ML true}, all sub-expressions of the pretty |
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printing tree will be parenthesized, even if this produces malformed |
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term syntax! This crude way of showing the internal structure of |
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pretty printed entities may occasionally help to diagnose problems |
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with operator priorities, for example. |
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\item @{ML eta_contract} controls @{text "\<eta>"}-contracted printing of |
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terms. |
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The @{text \<eta>}-contraction law asserts @{prop "(\<lambda>x. f x) \<equiv> f"}, |
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provided @{text x} is not free in @{text f}. It asserts |
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\emph{extensionality} of functions: @{prop "f \<equiv> g"} if @{prop "f x \<equiv> |
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g x"} for all @{text x}. Higher-order unification frequently puts |
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terms into a fully @{text \<eta>}-expanded form. For example, if @{text |
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F} has type @{text "(\<tau> \<Rightarrow> \<tau>) \<Rightarrow> \<tau>"} then its expanded form is @{term |
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"\<lambda>h. F (\<lambda>x. h x)"}. |
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Setting @{ML eta_contract} makes Isabelle perform @{text |
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\<eta>}-contractions before printing, so that @{term "\<lambda>h. F (\<lambda>x. h x)"} |
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appears simply as @{text F}. |
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Note that the distinction between a term and its @{text \<eta>}-expanded |
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form occasionally matters. While higher-order resolution and |
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rewriting operate modulo @{text "\<alpha>\<beta>\<eta>"}-conversion, some other tools |
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might look at terms more discretely. |
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\item @{ML goals_limit} controls the maximum number of subgoals to |
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be shown in goal output. |
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\item @{ML Proof.show_main_goal} controls whether the main result to |
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be proven should be displayed. This information might be relevant |
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for schematic goals, to inspect the current claim that has been |
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synthesized so far. |
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\item @{ML show_hyps} controls printing of implicit hypotheses of |
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local facts. Normally, only those hypotheses are displayed that are |
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\emph{not} covered by the assumptions of the current context: this |
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situation indicates a fault in some tool being used. |
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188 |
|
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By setting @{ML show_hyps} to @{ML true}, output of \emph{all} |
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hypotheses can be enforced, which is occasionally useful for |
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diagnostic purposes. |
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|
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\item @{ML show_tags} controls printing of extra annotations within |
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theorems, such as internal position information, or the case names |
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being attached by the attribute @{attribute case_names}. |
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|
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Note that the @{attribute tagged} and @{attribute untagged} |
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attributes provide low-level access to the collection of tags |
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associated with a theorem. |
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|
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\item @{ML show_question_marks} controls printing of question marks |
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for schematic variables, such as @{text ?x}. Only the leading |
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question mark is affected, the remaining text is unchanged |
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(including proper markup for schematic variables that might be |
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relevant for user interfaces). |
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|
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\end{description} |
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*} |
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209 |
|
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210 |
|
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subsection {* Printing limits *} |
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212 |
|
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text {* |
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\begin{mldecls} |
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@{index_ML Pretty.margin_default: "int Unsynchronized.ref"} \\ |
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@{index_ML print_depth: "int -> unit"} \\ |
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\end{mldecls} |
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|
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These ML functions set limits for pretty printed text. |
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|
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\begin{description} |
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|
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\item @{ML Pretty.margin_default} indicates the global default for |
224 |
the right margin of the built-in pretty printer, with initial value |
|
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76. Note that user-interfaces typically control margins |
|
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automatically when resizing windows, or even bypass the formatting |
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engine of Isabelle/ML altogether and do it within the front end via |
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Isabelle/Scala. |
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|
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\item @{ML print_depth}~@{text n} limits the printing depth of the |
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ML toplevel pretty printer; the precise effect depends on the ML |
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compiler and run-time system. Typically @{text n} should be less |
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than 10. Bigger values such as 100--1000 are useful for debugging. |
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|
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\end{description} |
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*} |
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|
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|
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section {* Mixfix annotations *} |
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||
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text {* Mixfix annotations specify concrete \emph{inner syntax} of |
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Isabelle types and terms. Locally fixed parameters in toplevel |
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theorem statements, locale specifications etc.\ also admit mixfix |
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annotations. |
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\indexouternonterm{infix}\indexouternonterm{mixfix}\indexouternonterm{structmixfix} |
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\begin{rail} |
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infix: '(' ('infix' | 'infixl' | 'infixr') string nat ')' |
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; |
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mixfix: infix | '(' string prios? nat? ')' | '(' 'binder' string prios? nat ')' |
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; |
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structmixfix: mixfix | '(' 'structure' ')' |
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; |
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prios: '[' (nat + ',') ']' |
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; |
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\end{rail} |
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Here the \railtok{string} specifications refer to the actual mixfix |
|
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template, which may include literal text, spacing, blocks, and |
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arguments (denoted by ``@{text _}''); the special symbol |
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``@{verbatim "\<index>"}'' (printed as ``@{text "\<index>"}'') represents an index |
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argument that specifies an implicit structure reference (see also |
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\secref{sec:locale}). Infix and binder declarations provide common |
|
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abbreviations for particular mixfix declarations. So in practice, |
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mixfix templates mostly degenerate to literal text for concrete |
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syntax, such as ``@{verbatim "++"}'' for an infix symbol. |
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\medskip In full generality, mixfix declarations work as follows. |
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Suppose a constant @{text "c :: \<tau>\<^sub>1 \<Rightarrow> \<dots> \<tau>\<^sub>n \<Rightarrow> \<tau>"} is |
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annotated by @{text "(mixfix [p\<^sub>1, \<dots>, p\<^sub>n] p)"}, where @{text |
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"mixfix"} is a string @{text "d\<^sub>0 _ d\<^sub>1 _ \<dots> _ d\<^sub>n"} consisting of |
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delimiters that surround argument positions as indicated by |
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underscores. |
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Altogether this determines a production for a context-free priority |
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grammar, where for each argument @{text "i"} the syntactic category |
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is determined by @{text "\<tau>\<^sub>i"} (with priority @{text "p\<^sub>i"}), and |
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the result category is determined from @{text "\<tau>"} (with |
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priority @{text "p"}). Priority specifications are optional, with |
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default 0 for arguments and 1000 for the result. |
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Since @{text "\<tau>"} may be again a function type, the constant |
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type scheme may have more argument positions than the mixfix |
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pattern. Printing a nested application @{text "c t\<^sub>1 \<dots> t\<^sub>m"} for |
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@{text "m > n"} works by attaching concrete notation only to the |
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innermost part, essentially by printing @{text "(c t\<^sub>1 \<dots> t\<^sub>n) \<dots> t\<^sub>m"} |
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instead. If a term has fewer arguments than specified in the mixfix |
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template, the concrete syntax is ignored. |
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\medskip A mixfix template may also contain additional directives |
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for pretty printing, notably spaces, blocks, and breaks. The |
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general template format is a sequence over any of the following |
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entities. |
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295 |
||
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\begin{description} |
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\item @{text "d"} is a delimiter, namely a non-empty sequence of |
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characters other than the following special characters: |
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\smallskip |
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\begin{tabular}{ll} |
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@{verbatim "'"} & single quote \\ |
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@{verbatim "_"} & underscore \\ |
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@{text "\<index>"} & index symbol \\ |
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@{verbatim "("} & open parenthesis \\ |
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@{verbatim ")"} & close parenthesis \\ |
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@{verbatim "/"} & slash \\ |
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\end{tabular} |
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\medskip |
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\item @{verbatim "'"} escapes the special meaning of these |
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meta-characters, producing a literal version of the following |
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character, unless that is a blank. |
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|
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A single quote followed by a blank separates delimiters, without |
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affecting printing, but input tokens may have additional white space |
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here. |
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|
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\item @{verbatim "_"} is an argument position, which stands for a |
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certain syntactic category in the underlying grammar. |
322 |
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\item @{text "\<index>"} is an indexed argument position; this is the place |
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where implicit structure arguments can be attached. |
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\item @{text "s"} is a non-empty sequence of spaces for printing. |
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This and the following specifications do not affect parsing at all. |
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\item @{verbatim "("}@{text n} opens a pretty printing block. The |
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optional number specifies how much indentation to add when a line |
331 |
break occurs within the block. If the parenthesis is not followed |
|
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by digits, the indentation defaults to 0. A block specified via |
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@{verbatim "(00"} is unbreakable. |
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\item @{verbatim ")"} closes a pretty printing block. |
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\item @{verbatim "//"} forces a line break. |
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\item @{verbatim "/"}@{text s} allows a line break. Here @{text s} |
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stands for the string of spaces (zero or more) right after the |
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slash. These spaces are printed if the break is \emph{not} taken. |
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|
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\end{description} |
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For example, the template @{verbatim "(_ +/ _)"} specifies an infix |
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operator. There are two argument positions; the delimiter |
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@{verbatim "+"} is preceded by a space and followed by a space or |
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line break; the entire phrase is a pretty printing block. |
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|
350 |
The general idea of pretty printing with blocks and breaks is also |
|
351 |
described in \cite{paulson-ml2}. |
|
352 |
*} |
|
353 |
||
354 |
||
35413 | 355 |
section {* Explicit notation *} |
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|
357 |
text {* |
|
358 |
\begin{matharray}{rcll} |
|
35413 | 359 |
@{command_def "type_notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
360 |
@{command_def "no_type_notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
|
28762 | 361 |
@{command_def "notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
362 |
@{command_def "no_notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\ |
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@{command_def "write"} & : & @{text "proof(state) \<rightarrow> proof(state)"} \\ |
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\end{matharray} |
365 |
||
366 |
\begin{rail} |
|
35413 | 367 |
('type\_notation' | 'no\_type\_notation') target? mode? \\ (nameref mixfix + 'and') |
368 |
; |
|
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('notation' | 'no\_notation') target? mode? \\ (nameref structmixfix + 'and') |
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; |
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'write' mode? (nameref structmixfix + 'and') |
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; |
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\end{rail} |
374 |
||
375 |
\begin{description} |
|
376 |
||
35413 | 377 |
\item @{command "type_notation"}~@{text "c (mx)"} associates mixfix |
378 |
syntax with an existing type constructor. The arity of the |
|
379 |
constructor is retrieved from the context. |
|
380 |
||
381 |
\item @{command "no_type_notation"} is similar to @{command |
|
382 |
"type_notation"}, but removes the specified syntax annotation from |
|
383 |
the present context. |
|
384 |
||
28762 | 385 |
\item @{command "notation"}~@{text "c (mx)"} associates mixfix |
35413 | 386 |
syntax with an existing constant or fixed variable. The type |
387 |
declaration of the given entity is retrieved from the context. |
|
28762 | 388 |
|
389 |
\item @{command "no_notation"} is similar to @{command "notation"}, |
|
390 |
but removes the specified syntax annotation from the present |
|
391 |
context. |
|
392 |
||
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\item @{command "write"} is similar to @{command "notation"}, but |
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394 |
works within an Isar proof body. |
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395 |
|
28762 | 396 |
\end{description} |
35413 | 397 |
|
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398 |
Note that the more primitive commands @{command "syntax"} and |
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399 |
@{command "no_syntax"} (\secref{sec:syn-trans}) provide raw access |
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400 |
to the syntax tables of a global theory. |
28762 | 401 |
*} |
402 |
||
28778 | 403 |
|
404 |
section {* The Pure syntax \label{sec:pure-syntax} *} |
|
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405 |
|
28777 | 406 |
subsection {* Priority grammars \label{sec:priority-grammar} *} |
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407 |
|
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408 |
text {* A context-free grammar consists of a set of \emph{terminal |
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409 |
symbols}, a set of \emph{nonterminal symbols} and a set of |
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410 |
\emph{productions}. Productions have the form @{text "A = \<gamma>"}, |
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411 |
where @{text A} is a nonterminal and @{text \<gamma>} is a string of |
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412 |
terminals and nonterminals. One designated nonterminal is called |
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413 |
the \emph{root symbol}. The language defined by the grammar |
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414 |
consists of all strings of terminals that can be derived from the |
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415 |
root symbol by applying productions as rewrite rules. |
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416 |
|
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417 |
The standard Isabelle parser for inner syntax uses a \emph{priority |
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418 |
grammar}. Each nonterminal is decorated by an integer priority: |
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419 |
@{text "A\<^sup>(\<^sup>p\<^sup>)"}. In a derivation, @{text "A\<^sup>(\<^sup>p\<^sup>)"} may be rewritten |
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420 |
using a production @{text "A\<^sup>(\<^sup>q\<^sup>) = \<gamma>"} only if @{text "p \<le> q"}. Any |
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421 |
priority grammar can be translated into a normal context-free |
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422 |
grammar by introducing new nonterminals and productions. |
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423 |
|
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424 |
\medskip Formally, a set of context free productions @{text G} |
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425 |
induces a derivation relation @{text "\<longrightarrow>\<^sub>G"} as follows. Let @{text |
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426 |
\<alpha>} and @{text \<beta>} denote strings of terminal or nonterminal symbols. |
28774 | 427 |
Then @{text "\<alpha> A\<^sup>(\<^sup>p\<^sup>) \<beta> \<longrightarrow>\<^sub>G \<alpha> \<gamma> \<beta>"} holds if and only if @{text G} |
428 |
contains some production @{text "A\<^sup>(\<^sup>q\<^sup>) = \<gamma>"} for @{text "p \<le> q"}. |
|
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429 |
|
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430 |
\medskip The following grammar for arithmetic expressions |
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431 |
demonstrates how binding power and associativity of operators can be |
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432 |
enforced by priorities. |
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|
433 |
|
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434 |
\begin{center} |
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435 |
\begin{tabular}{rclr} |
28774 | 436 |
@{text "A\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>)"} & @{text "="} & @{verbatim "("} @{text "A\<^sup>(\<^sup>0\<^sup>)"} @{verbatim ")"} \\ |
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437 |
@{text "A\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>)"} & @{text "="} & @{verbatim 0} \\ |
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438 |
@{text "A\<^sup>(\<^sup>0\<^sup>)"} & @{text "="} & @{text "A\<^sup>(\<^sup>0\<^sup>)"} @{verbatim "+"} @{text "A\<^sup>(\<^sup>1\<^sup>)"} \\ |
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439 |
@{text "A\<^sup>(\<^sup>2\<^sup>)"} & @{text "="} & @{text "A\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "*"} @{text "A\<^sup>(\<^sup>2\<^sup>)"} \\ |
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440 |
@{text "A\<^sup>(\<^sup>3\<^sup>)"} & @{text "="} & @{verbatim "-"} @{text "A\<^sup>(\<^sup>3\<^sup>)"} \\ |
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441 |
\end{tabular} |
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442 |
\end{center} |
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443 |
The choice of priorities determines that @{verbatim "-"} binds |
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444 |
tighter than @{verbatim "*"}, which binds tighter than @{verbatim |
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445 |
"+"}. Furthermore @{verbatim "+"} associates to the left and |
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446 |
@{verbatim "*"} to the right. |
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447 |
|
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448 |
\medskip For clarity, grammars obey these conventions: |
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449 |
\begin{itemize} |
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450 |
|
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451 |
\item All priorities must lie between 0 and 1000. |
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452 |
|
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453 |
\item Priority 0 on the right-hand side and priority 1000 on the |
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454 |
left-hand side may be omitted. |
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455 |
|
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456 |
\item The production @{text "A\<^sup>(\<^sup>p\<^sup>) = \<alpha>"} is written as @{text "A = \<alpha> |
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457 |
(p)"}, i.e.\ the priority of the left-hand side actually appears in |
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458 |
a column on the far right. |
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459 |
|
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460 |
\item Alternatives are separated by @{text "|"}. |
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461 |
|
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462 |
\item Repetition is indicated by dots @{text "(\<dots>)"} in an informal |
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463 |
but obvious way. |
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464 |
|
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465 |
\end{itemize} |
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466 |
|
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467 |
Using these conventions, the example grammar specification above |
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468 |
takes the form: |
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469 |
\begin{center} |
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470 |
\begin{tabular}{rclc} |
28774 | 471 |
@{text A} & @{text "="} & @{verbatim "("} @{text A} @{verbatim ")"} \\ |
472 |
& @{text "|"} & @{verbatim 0} & \qquad\qquad \\ |
|
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473 |
& @{text "|"} & @{text A} @{verbatim "+"} @{text "A\<^sup>(\<^sup>1\<^sup>)"} & @{text "(0)"} \\ |
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474 |
& @{text "|"} & @{text "A\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "*"} @{text "A\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\ |
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475 |
& @{text "|"} & @{verbatim "-"} @{text "A\<^sup>(\<^sup>3\<^sup>)"} & @{text "(3)"} \\ |
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476 |
\end{tabular} |
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477 |
\end{center} |
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|
478 |
*} |
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|
479 |
|
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|
480 |
|
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|
481 |
subsection {* The Pure grammar *} |
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482 |
|
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483 |
text {* |
28773 | 484 |
The priority grammar of the @{text "Pure"} theory is defined as follows: |
485 |
||
28774 | 486 |
%FIXME syntax for "index" (?) |
487 |
%FIXME "op" versions of ==> etc. (?) |
|
488 |
||
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489 |
\begin{center} |
28773 | 490 |
\begin{supertabular}{rclr} |
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491 |
|
28778 | 492 |
@{syntax_def (inner) any} & = & @{text "prop | logic"} \\\\ |
28772 | 493 |
|
28778 | 494 |
@{syntax_def (inner) prop} & = & @{verbatim "("} @{text prop} @{verbatim ")"} \\ |
28772 | 495 |
& @{text "|"} & @{text "prop\<^sup>(\<^sup>4\<^sup>)"} @{verbatim "::"} @{text type} & @{text "(3)"} \\ |
28773 | 496 |
& @{text "|"} & @{text "any\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "=?="} @{text "any\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\ |
28772 | 497 |
& @{text "|"} & @{text "any\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "=="} @{text "any\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\ |
28773 | 498 |
& @{text "|"} & @{text "any\<^sup>(\<^sup>3\<^sup>)"} @{text "\<equiv>"} @{text "any\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\ |
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499 |
& @{text "|"} & @{text "prop\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "&&&"} @{text "prop\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\ |
28772 | 500 |
& @{text "|"} & @{text "prop\<^sup>(\<^sup>2\<^sup>)"} @{verbatim "==>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\ |
28773 | 501 |
& @{text "|"} & @{text "prop\<^sup>(\<^sup>2\<^sup>)"} @{text "\<Longrightarrow>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\ |
28772 | 502 |
& @{text "|"} & @{verbatim "[|"} @{text prop} @{verbatim ";"} @{text "\<dots>"} @{verbatim ";"} @{text prop} @{verbatim "|]"} @{verbatim "==>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\ |
28773 | 503 |
& @{text "|"} & @{text "\<lbrakk>"} @{text prop} @{verbatim ";"} @{text "\<dots>"} @{verbatim ";"} @{text prop} @{text "\<rbrakk>"} @{text "\<Longrightarrow>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\ |
28772 | 504 |
& @{text "|"} & @{verbatim "!!"} @{text idts} @{verbatim "."} @{text prop} & @{text "(0)"} \\ |
28773 | 505 |
& @{text "|"} & @{text "\<And>"} @{text idts} @{verbatim "."} @{text prop} & @{text "(0)"} \\ |
506 |
& @{text "|"} & @{verbatim OFCLASS} @{verbatim "("} @{text type} @{verbatim ","} @{text logic} @{verbatim ")"} \\ |
|
507 |
& @{text "|"} & @{verbatim SORT_CONSTRAINT} @{verbatim "("} @{text type} @{verbatim ")"} \\ |
|
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508 |
& @{text "|"} & @{verbatim TERM} @{text logic} \\ |
28773 | 509 |
& @{text "|"} & @{verbatim PROP} @{text aprop} \\\\ |
28772 | 510 |
|
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511 |
@{syntax_def (inner) aprop} & = & @{verbatim "("} @{text aprop} @{verbatim ")"} \\ |
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512 |
& @{text "|"} & @{text "id | longid | var | "}@{verbatim "_"}@{text " | "}@{verbatim "..."} \\ |
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|
513 |
& @{text "|"} & @{verbatim CONST} @{text "id | "}@{verbatim CONST} @{text "longid"} \\ |
28773 | 514 |
& @{text "|"} & @{text "logic\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>) any\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>) \<dots> any\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>)"} & @{text "(999)"} \\\\ |
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515 |
|
28778 | 516 |
@{syntax_def (inner) logic} & = & @{verbatim "("} @{text logic} @{verbatim ")"} \\ |
28772 | 517 |
& @{text "|"} & @{text "logic\<^sup>(\<^sup>4\<^sup>)"} @{verbatim "::"} @{text type} & @{text "(3)"} \\ |
28773 | 518 |
& @{text "|"} & @{text "id | longid | var | "}@{verbatim "_"}@{text " | "}@{verbatim "..."} \\ |
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|
519 |
& @{text "|"} & @{verbatim CONST} @{text "id | "}@{verbatim CONST} @{text "longid"} \\ |
28773 | 520 |
& @{text "|"} & @{text "logic\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>) any\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>) \<dots> any\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>)"} & @{text "(999)"} \\ |
28772 | 521 |
& @{text "|"} & @{verbatim "%"} @{text pttrns} @{verbatim "."} @{text "any\<^sup>(\<^sup>3\<^sup>)"} & @{text "(3)"} \\ |
28773 | 522 |
& @{text "|"} & @{text \<lambda>} @{text pttrns} @{verbatim "."} @{text "any\<^sup>(\<^sup>3\<^sup>)"} & @{text "(3)"} \\ |
28772 | 523 |
& @{text "|"} & @{verbatim TYPE} @{verbatim "("} @{text type} @{verbatim ")"} \\\\ |
524 |
||
28778 | 525 |
@{syntax_def (inner) idt} & = & @{verbatim "("} @{text idt} @{verbatim ")"}@{text " | id | "}@{verbatim "_"} \\ |
28773 | 526 |
& @{text "|"} & @{text id} @{verbatim "::"} @{text type} & @{text "(0)"} \\ |
527 |
& @{text "|"} & @{verbatim "_"} @{verbatim "::"} @{text type} & @{text "(0)"} \\\\ |
|
28772 | 528 |
|
28778 | 529 |
@{syntax_def (inner) idts} & = & @{text "idt | idt\<^sup>(\<^sup>1\<^sup>) idts"} & @{text "(0)"} \\\\ |
28772 | 530 |
|
28778 | 531 |
@{syntax_def (inner) pttrn} & = & @{text idt} \\\\ |
28772 | 532 |
|
28778 | 533 |
@{syntax_def (inner) pttrns} & = & @{text "pttrn | pttrn\<^sup>(\<^sup>1\<^sup>) pttrns"} & @{text "(0)"} \\\\ |
28774 | 534 |
|
28778 | 535 |
@{syntax_def (inner) type} & = & @{verbatim "("} @{text type} @{verbatim ")"} \\ |
28773 | 536 |
& @{text "|"} & @{text "tid | tvar | "}@{verbatim "_"} \\ |
537 |
& @{text "|"} & @{text "tid"} @{verbatim "::"} @{text "sort | tvar "}@{verbatim "::"} @{text "sort | "}@{verbatim "_"} @{verbatim "::"} @{text "sort"} \\ |
|
28772 | 538 |
& @{text "|"} & @{text "id | type\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>) id | "}@{verbatim "("} @{text type} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text type} @{verbatim ")"} @{text id} \\ |
29741 | 539 |
& @{text "|"} & @{text "longid | type\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>) longid"} \\ |
540 |
& @{text "|"} & @{verbatim "("} @{text type} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text type} @{verbatim ")"} @{text longid} \\ |
|
28772 | 541 |
& @{text "|"} & @{text "type\<^sup>(\<^sup>1\<^sup>)"} @{verbatim "=>"} @{text type} & @{text "(0)"} \\ |
28773 | 542 |
& @{text "|"} & @{text "type\<^sup>(\<^sup>1\<^sup>)"} @{text "\<Rightarrow>"} @{text type} & @{text "(0)"} \\ |
543 |
& @{text "|"} & @{verbatim "["} @{text type} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text type} @{verbatim "]"} @{verbatim "=>"} @{text type} & @{text "(0)"} \\ |
|
544 |
& @{text "|"} & @{verbatim "["} @{text type} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text type} @{verbatim "]"} @{text "\<Rightarrow>"} @{text type} & @{text "(0)"} \\\\ |
|
28772 | 545 |
|
29741 | 546 |
@{syntax_def (inner) sort} & = & @{text "id | longid | "}@{verbatim "{}"} \\ |
547 |
& @{text "|"} & @{verbatim "{"} @{text "(id | longid)"} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text "(id | longid)"} @{verbatim "}"} \\ |
|
28773 | 548 |
\end{supertabular} |
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|
549 |
\end{center} |
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|
550 |
|
28774 | 551 |
\medskip Here literal terminals are printed @{verbatim "verbatim"}; |
552 |
see also \secref{sec:inner-lex} for further token categories of the |
|
553 |
inner syntax. The meaning of the nonterminals defined by the above |
|
554 |
grammar is as follows: |
|
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|
555 |
|
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|
556 |
\begin{description} |
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|
557 |
|
28778 | 558 |
\item @{syntax_ref (inner) any} denotes any term. |
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|
559 |
|
28778 | 560 |
\item @{syntax_ref (inner) prop} denotes meta-level propositions, |
561 |
which are terms of type @{typ prop}. The syntax of such formulae of |
|
562 |
the meta-logic is carefully distinguished from usual conventions for |
|
563 |
object-logics. In particular, plain @{text "\<lambda>"}-term notation is |
|
564 |
\emph{not} recognized as @{syntax (inner) prop}. |
|
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|
565 |
|
28778 | 566 |
\item @{syntax_ref (inner) aprop} denotes atomic propositions, which |
567 |
are embedded into regular @{syntax (inner) prop} by means of an |
|
568 |
explicit @{verbatim PROP} token. |
|
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|
569 |
|
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|
570 |
Terms of type @{typ prop} with non-constant head, e.g.\ a plain |
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|
571 |
variable, are printed in this form. Constants that yield type @{typ |
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|
572 |
prop} are expected to provide their own concrete syntax; otherwise |
28778 | 573 |
the printed version will appear like @{syntax (inner) logic} and |
574 |
cannot be parsed again as @{syntax (inner) prop}. |
|
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|
575 |
|
28778 | 576 |
\item @{syntax_ref (inner) logic} denotes arbitrary terms of a |
577 |
logical type, excluding type @{typ prop}. This is the main |
|
578 |
syntactic category of object-logic entities, covering plain @{text |
|
579 |
\<lambda>}-term notation (variables, abstraction, application), plus |
|
580 |
anything defined by the user. |
|
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|
581 |
|
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|
582 |
When specifying notation for logical entities, all logical types |
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|
583 |
(excluding @{typ prop}) are \emph{collapsed} to this single category |
28778 | 584 |
of @{syntax (inner) logic}. |
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|
585 |
|
28778 | 586 |
\item @{syntax_ref (inner) idt} denotes identifiers, possibly |
587 |
constrained by types. |
|
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|
588 |
|
28778 | 589 |
\item @{syntax_ref (inner) idts} denotes a sequence of @{syntax_ref |
590 |
(inner) idt}. This is the most basic category for variables in |
|
591 |
iterated binders, such as @{text "\<lambda>"} or @{text "\<And>"}. |
|
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|
592 |
|
28778 | 593 |
\item @{syntax_ref (inner) pttrn} and @{syntax_ref (inner) pttrns} |
594 |
denote patterns for abstraction, cases bindings etc. In Pure, these |
|
595 |
categories start as a merely copy of @{syntax (inner) idt} and |
|
596 |
@{syntax (inner) idts}, respectively. Object-logics may add |
|
597 |
additional productions for binding forms. |
|
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|
598 |
|
28778 | 599 |
\item @{syntax_ref (inner) type} denotes types of the meta-logic. |
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|
600 |
|
28778 | 601 |
\item @{syntax_ref (inner) sort} denotes meta-level sorts. |
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|
602 |
|
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|
603 |
\end{description} |
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|
604 |
|
28774 | 605 |
Here are some further explanations of certain syntax features. |
28773 | 606 |
|
607 |
\begin{itemize} |
|
28770
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|
608 |
|
28778 | 609 |
\item In @{syntax (inner) idts}, note that @{text "x :: nat y"} is |
610 |
parsed as @{text "x :: (nat y)"}, treating @{text y} like a type |
|
611 |
constructor applied to @{text nat}. To avoid this interpretation, |
|
612 |
write @{text "(x :: nat) y"} with explicit parentheses. |
|
28773 | 613 |
|
614 |
\item Similarly, @{text "x :: nat y :: nat"} is parsed as @{text "x :: |
|
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|
615 |
(nat y :: nat)"}. The correct form is @{text "(x :: nat) (y :: |
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|
616 |
nat)"}, or @{text "(x :: nat) y :: nat"} if @{text y} is last in the |
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617 |
sequence of identifiers. |
28773 | 618 |
|
619 |
\item Type constraints for terms bind very weakly. For example, |
|
620 |
@{text "x < y :: nat"} is normally parsed as @{text "(x < y) :: |
|
621 |
nat"}, unless @{text "<"} has a very low priority, in which case the |
|
622 |
input is likely to be ambiguous. The correct form is @{text "x < (y |
|
623 |
:: nat)"}. |
|
624 |
||
625 |
\item Constraints may be either written with two literal colons |
|
626 |
``@{verbatim "::"}'' or the double-colon symbol @{verbatim "\<Colon>"}, |
|
28774 | 627 |
which actually looks exactly the same in some {\LaTeX} styles. |
28773 | 628 |
|
28774 | 629 |
\item Dummy variables (written as underscore) may occur in different |
630 |
roles. |
|
28773 | 631 |
|
632 |
\begin{description} |
|
633 |
||
28774 | 634 |
\item A type ``@{text "_"}'' or ``@{text "_ :: sort"}'' acts like an |
635 |
anonymous inference parameter, which is filled-in according to the |
|
636 |
most general type produced by the type-checking phase. |
|
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|
637 |
|
28774 | 638 |
\item A bound ``@{text "_"}'' refers to a vacuous abstraction, where |
639 |
the body does not refer to the binding introduced here. As in the |
|
640 |
term @{term "\<lambda>x _. x"}, which is @{text "\<alpha>"}-equivalent to @{text |
|
641 |
"\<lambda>x y. x"}. |
|
28773 | 642 |
|
28774 | 643 |
\item A free ``@{text "_"}'' refers to an implicit outer binding. |
644 |
Higher definitional packages usually allow forms like @{text "f x _ |
|
645 |
= x"}. |
|
28773 | 646 |
|
28774 | 647 |
\item A schematic ``@{text "_"}'' (within a term pattern, see |
648 |
\secref{sec:term-decls}) refers to an anonymous variable that is |
|
649 |
implicitly abstracted over its context of locally bound variables. |
|
650 |
For example, this allows pattern matching of @{text "{x. f x = g |
|
651 |
x}"} against @{text "{x. _ = _}"}, or even @{text "{_. _ = _}"} by |
|
652 |
using both bound and schematic dummies. |
|
28773 | 653 |
|
654 |
\end{description} |
|
655 |
||
28774 | 656 |
\item The three literal dots ``@{verbatim "..."}'' may be also |
657 |
written as ellipsis symbol @{verbatim "\<dots>"}. In both cases this |
|
658 |
refers to a special schematic variable, which is bound in the |
|
659 |
context. This special term abbreviation works nicely with |
|
660 |
calculational reasoning (\secref{sec:calculation}). |
|
661 |
||
28773 | 662 |
\end{itemize} |
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|
663 |
*} |
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|
664 |
|
28777 | 665 |
|
28774 | 666 |
section {* Lexical matters \label{sec:inner-lex} *} |
667 |
||
28777 | 668 |
text {* The inner lexical syntax vaguely resembles the outer one |
669 |
(\secref{sec:outer-lex}), but some details are different. There are |
|
670 |
two main categories of inner syntax tokens: |
|
671 |
||
672 |
\begin{enumerate} |
|
673 |
||
674 |
\item \emph{delimiters} --- the literal tokens occurring in |
|
675 |
productions of the given priority grammar (cf.\ |
|
676 |
\secref{sec:priority-grammar}); |
|
677 |
||
678 |
\item \emph{named tokens} --- various categories of identifiers etc. |
|
679 |
||
680 |
\end{enumerate} |
|
681 |
||
682 |
Delimiters override named tokens and may thus render certain |
|
683 |
identifiers inaccessible. Sometimes the logical context admits |
|
684 |
alternative ways to refer to the same entity, potentially via |
|
685 |
qualified names. |
|
686 |
||
687 |
\medskip The categories for named tokens are defined once and for |
|
688 |
all as follows, reusing some categories of the outer token syntax |
|
689 |
(\secref{sec:outer-lex}). |
|
690 |
||
691 |
\begin{center} |
|
692 |
\begin{supertabular}{rcl} |
|
693 |
@{syntax_def (inner) id} & = & @{syntax_ref ident} \\ |
|
694 |
@{syntax_def (inner) longid} & = & @{syntax_ref longident} \\ |
|
695 |
@{syntax_def (inner) var} & = & @{syntax_ref var} \\ |
|
696 |
@{syntax_def (inner) tid} & = & @{syntax_ref typefree} \\ |
|
697 |
@{syntax_def (inner) tvar} & = & @{syntax_ref typevar} \\ |
|
698 |
@{syntax_def (inner) num} & = & @{syntax_ref nat}@{text " | "}@{verbatim "-"}@{syntax_ref nat} \\ |
|
29157 | 699 |
@{syntax_def (inner) float_token} & = & @{syntax_ref nat}@{verbatim "."}@{syntax_ref nat}@{text " | "}@{verbatim "-"}@{syntax_ref nat}@{verbatim "."}@{syntax_ref nat} \\ |
28777 | 700 |
@{syntax_def (inner) xnum} & = & @{verbatim "#"}@{syntax_ref nat}@{text " | "}@{verbatim "#-"}@{syntax_ref nat} \\ |
701 |
||
702 |
@{syntax_def (inner) xstr} & = & @{verbatim "''"} @{text "\<dots>"} @{verbatim "''"} \\ |
|
703 |
\end{supertabular} |
|
704 |
\end{center} |
|
705 |
||
29157 | 706 |
The token categories @{syntax (inner) num}, @{syntax (inner) |
707 |
float_token}, @{syntax (inner) xnum}, and @{syntax (inner) xstr} are |
|
708 |
not used in Pure. Object-logics may implement numerals and string |
|
709 |
constants by adding appropriate syntax declarations, together with |
|
710 |
some translation functions (e.g.\ see Isabelle/HOL). |
|
711 |
||
712 |
The derived categories @{syntax_def (inner) num_const} and |
|
713 |
@{syntax_def (inner) float_const} provide robust access to @{syntax |
|
714 |
(inner) num}, and @{syntax (inner) float_token}, respectively: the |
|
715 |
syntax tree holds a syntactic constant instead of a free variable. |
|
28777 | 716 |
*} |
28774 | 717 |
|
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|
718 |
|
28762 | 719 |
section {* Syntax and translations \label{sec:syn-trans} *} |
720 |
||
721 |
text {* |
|
722 |
\begin{matharray}{rcl} |
|
723 |
@{command_def "nonterminals"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
724 |
@{command_def "syntax"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
725 |
@{command_def "no_syntax"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
726 |
@{command_def "translations"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
727 |
@{command_def "no_translations"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
728 |
\end{matharray} |
|
729 |
||
730 |
\begin{rail} |
|
731 |
'nonterminals' (name +) |
|
732 |
; |
|
733 |
('syntax' | 'no\_syntax') mode? (constdecl +) |
|
734 |
; |
|
735 |
('translations' | 'no\_translations') (transpat ('==' | '=>' | '<=' | rightleftharpoons | rightharpoonup | leftharpoondown) transpat +) |
|
736 |
; |
|
737 |
||
738 |
mode: ('(' ( name | 'output' | name 'output' ) ')') |
|
739 |
; |
|
740 |
transpat: ('(' nameref ')')? string |
|
741 |
; |
|
742 |
\end{rail} |
|
743 |
||
744 |
\begin{description} |
|
745 |
||
746 |
\item @{command "nonterminals"}~@{text c} declares a type |
|
747 |
constructor @{text c} (without arguments) to act as purely syntactic |
|
748 |
type: a nonterminal symbol of the inner syntax. |
|
749 |
||
750 |
\item @{command "syntax"}~@{text "(mode) decls"} is similar to |
|
751 |
@{command "consts"}~@{text decls}, except that the actual logical |
|
752 |
signature extension is omitted. Thus the context free grammar of |
|
753 |
Isabelle's inner syntax may be augmented in arbitrary ways, |
|
754 |
independently of the logic. The @{text mode} argument refers to the |
|
755 |
print mode that the grammar rules belong; unless the @{keyword_ref |
|
756 |
"output"} indicator is given, all productions are added both to the |
|
757 |
input and output grammar. |
|
758 |
||
759 |
\item @{command "no_syntax"}~@{text "(mode) decls"} removes grammar |
|
760 |
declarations (and translations) resulting from @{text decls}, which |
|
761 |
are interpreted in the same manner as for @{command "syntax"} above. |
|
762 |
||
763 |
\item @{command "translations"}~@{text rules} specifies syntactic |
|
764 |
translation rules (i.e.\ macros): parse~/ print rules (@{text "\<rightleftharpoons>"}), |
|
765 |
parse rules (@{text "\<rightharpoonup>"}), or print rules (@{text "\<leftharpoondown>"}). |
|
766 |
Translation patterns may be prefixed by the syntactic category to be |
|
767 |
used for parsing; the default is @{text logic}. |
|
768 |
||
769 |
\item @{command "no_translations"}~@{text rules} removes syntactic |
|
770 |
translation rules, which are interpreted in the same manner as for |
|
771 |
@{command "translations"} above. |
|
772 |
||
773 |
\end{description} |
|
774 |
*} |
|
775 |
||
776 |
||
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changeset
|
777 |
section {* Syntax translation functions \label{sec:tr-funs} *} |
28762 | 778 |
|
779 |
text {* |
|
780 |
\begin{matharray}{rcl} |
|
781 |
@{command_def "parse_ast_translation"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
782 |
@{command_def "parse_translation"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
783 |
@{command_def "print_translation"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
784 |
@{command_def "typed_print_translation"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
785 |
@{command_def "print_ast_translation"} & : & @{text "theory \<rightarrow> theory"} \\ |
|
786 |
\end{matharray} |
|
787 |
||
788 |
\begin{rail} |
|
789 |
( 'parse\_ast\_translation' | 'parse\_translation' | 'print\_translation' | |
|
790 |
'typed\_print\_translation' | 'print\_ast\_translation' ) ('(advanced)')? text |
|
791 |
; |
|
792 |
\end{rail} |
|
793 |
||
794 |
Syntax translation functions written in ML admit almost arbitrary |
|
795 |
manipulations of Isabelle's inner syntax. Any of the above commands |
|
796 |
have a single \railqtok{text} argument that refers to an ML |
|
797 |
expression of appropriate type, which are as follows by default: |
|
798 |
||
799 |
%FIXME proper antiquotations |
|
800 |
\begin{ttbox} |
|
801 |
val parse_ast_translation : (string * (ast list -> ast)) list |
|
802 |
val parse_translation : (string * (term list -> term)) list |
|
803 |
val print_translation : (string * (term list -> term)) list |
|
804 |
val typed_print_translation : |
|
805 |
(string * (bool -> typ -> term list -> term)) list |
|
806 |
val print_ast_translation : (string * (ast list -> ast)) list |
|
807 |
\end{ttbox} |
|
808 |
||
809 |
If the @{text "(advanced)"} option is given, the corresponding |
|
810 |
translation functions may depend on the current theory or proof |
|
811 |
context. This allows to implement advanced syntax mechanisms, as |
|
812 |
translations functions may refer to specific theory declarations or |
|
813 |
auxiliary proof data. |
|
814 |
||
30397 | 815 |
See also \cite{isabelle-ref} for more information on the general |
816 |
concept of syntax transformations in Isabelle. |
|
28762 | 817 |
|
818 |
%FIXME proper antiquotations |
|
819 |
\begin{ttbox} |
|
820 |
val parse_ast_translation: |
|
821 |
(string * (Proof.context -> ast list -> ast)) list |
|
822 |
val parse_translation: |
|
823 |
(string * (Proof.context -> term list -> term)) list |
|
824 |
val print_translation: |
|
825 |
(string * (Proof.context -> term list -> term)) list |
|
826 |
val typed_print_translation: |
|
827 |
(string * (Proof.context -> bool -> typ -> term list -> term)) list |
|
828 |
val print_ast_translation: |
|
829 |
(string * (Proof.context -> ast list -> ast)) list |
|
830 |
\end{ttbox} |
|
831 |
*} |
|
832 |
||
28779
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|
833 |
|
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|
834 |
section {* Inspecting the syntax *} |
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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changeset
|
835 |
|
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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diff
changeset
|
836 |
text {* |
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|
837 |
\begin{matharray}{rcl} |
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|
838 |
@{command_def "print_syntax"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\ |
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|
839 |
\end{matharray} |
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|
840 |
|
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changeset
|
841 |
\begin{description} |
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|
842 |
|
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|
843 |
\item @{command "print_syntax"} prints the inner syntax of the |
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|
844 |
current context. The output can be quite large; the most important |
698960f08652
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|
845 |
sections are explained below. |
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|
846 |
|
698960f08652
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changeset
|
847 |
\begin{description} |
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|
848 |
|
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|
849 |
\item @{text "lexicon"} lists the delimiters of the inner token |
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|
850 |
language; see \secref{sec:inner-lex}. |
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|
851 |
|
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|
852 |
\item @{text "prods"} lists the productions of the underlying |
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|
853 |
priority grammar; see \secref{sec:priority-grammar}. |
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|
854 |
|
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|
855 |
The nonterminal @{text "A\<^sup>(\<^sup>p\<^sup>)"} is rendered in plain text as @{text |
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|
856 |
"A[p]"}; delimiters are quoted. Many productions have an extra |
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|
857 |
@{text "\<dots> => name"}. These names later become the heads of parse |
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|
858 |
trees; they also guide the pretty printer. |
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separate section "Inspecting the syntax" for print_syntax;
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changeset
|
859 |
|
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|
860 |
Productions without such parse tree names are called \emph{copy |
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|
861 |
productions}. Their right-hand side must have exactly one |
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|
862 |
nonterminal symbol (or named token). The parser does not create a |
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|
863 |
new parse tree node for copy productions, but simply returns the |
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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parents:
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|
864 |
parse tree of the right-hand symbol. |
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changeset
|
865 |
|
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separate section "Inspecting the syntax" for print_syntax;
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changeset
|
866 |
If the right-hand side of a copy production consists of a single |
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|
867 |
nonterminal without any delimiters, then it is called a \emph{chain |
698960f08652
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|
868 |
production}. Chain productions act as abbreviations: conceptually, |
698960f08652
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|
869 |
they are removed from the grammar by adding new productions. |
698960f08652
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|
870 |
Priority information attached to chain productions is ignored; only |
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|
871 |
the dummy value @{text "-1"} is displayed. |
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|
872 |
|
28856
5e009a80fe6d
Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
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|
873 |
\item @{text "print modes"} lists the alternative print modes |
28779
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|
874 |
provided by this grammar; see \secref{sec:print-modes}. |
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|
875 |
|
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|
876 |
\item @{text "parse_rules"} and @{text "print_rules"} relate to |
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|
877 |
syntax translations (macros); see \secref{sec:syn-trans}. |
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changeset
|
878 |
|
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|
879 |
\item @{text "parse_ast_translation"} and @{text |
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|
880 |
"print_ast_translation"} list sets of constants that invoke |
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|
881 |
translation functions for abstract syntax trees, which are only |
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|
882 |
required in very special situations; see \secref{sec:tr-funs}. |
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changeset
|
883 |
|
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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diff
changeset
|
884 |
\item @{text "parse_translation"} and @{text "print_translation"} |
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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parents:
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changeset
|
885 |
list the sets of constants that invoke regular translation |
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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parents:
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changeset
|
886 |
functions; see \secref{sec:tr-funs}. |
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separate section "Inspecting the syntax" for print_syntax;
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parents:
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diff
changeset
|
887 |
|
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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parents:
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diff
changeset
|
888 |
\end{description} |
698960f08652
separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents:
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diff
changeset
|
889 |
|
698960f08652
separate section "Inspecting the syntax" for print_syntax;
wenzelm
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diff
changeset
|
890 |
\end{description} |
698960f08652
separate section "Inspecting the syntax" for print_syntax;
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parents:
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diff
changeset
|
891 |
*} |
698960f08652
separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents:
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diff
changeset
|
892 |
|
28762 | 893 |
end |