doc-src/IsarRef/Thy/Inner_Syntax.thy
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theory Inner_Syntax
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imports Base 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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  @{rail "
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    @@{command typ} @{syntax modes}? @{syntax type}
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    ;
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    @@{command term} @{syntax modes}? @{syntax term}
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    ;
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    @@{command prop} @{syntax modes}? @{syntax prop}
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    ;
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    @@{command thm} @{syntax modes}? @{syntax thmrefs}
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    ;
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    ( @@{command prf} | @@{command full_prf} ) @{syntax modes}? @{syntax thmrefs}?
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    ;
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    @@{command pr} @{syntax modes}? @{syntax nat}?
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    ;
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    @{syntax_def modes}: '(' (@{syntax name} + ) ')'
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  "}
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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"} prints the current proof state
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  (if present), including current facts and goals.  The optional limit
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  arguments affect the number of goals to be displayed, which is
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  initially 10.  Omitting limit value leaves the current setting
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  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{tabular}{rcll}
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    @{attribute_def show_types} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def show_sorts} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def show_consts} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def show_abbrevs} & : & @{text attribute} & default @{text true} \\
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    @{attribute_def show_brackets} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def long_names} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def short_names} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def unique_names} & : & @{text attribute} & default @{text true} \\
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    @{attribute_def eta_contract} & : & @{text attribute} & default @{text true} \\
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    @{attribute_def goals_limit} & : & @{text attribute} & default @{text 10} \\
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    @{attribute_def show_main_goal} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def show_hyps} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def show_tags} & : & @{text attribute} & default @{text false} \\
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    @{attribute_def show_question_marks} & : & @{text attribute} & default @{text true} \\
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  \end{tabular}
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  \medskip
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  These configuration options control the detail of information that
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  is displayed for types, terms, theorems, goals etc.  See also
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  \secref{sec:config}.
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  \begin{description}
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  \item @{attribute show_types} and @{attribute show_sorts} control
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  printing of type constraints for term variables, and sort
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  constraints for type variables.  By default, neither of these are
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  shown in output.  If @{attribute show_sorts} is enabled, types are
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  always shown as 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 @{attribute show_consts} controls printing of types of
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  constants when 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 @{attribute show_abbrevs} controls folding of constant
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  abbreviations.
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  \item @{attribute show_brackets} controls bracketing in pretty
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  printed output.  If enabled, 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 @{attribute long_names}, @{attribute short_names}, and
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  @{attribute unique_names} control the way of printing fully
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  qualified internal names in external form.  See also
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  \secref{sec:antiq} for the document antiquotation options of the
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  same names.
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  \item @{attribute eta_contract} controls @{text "\<eta>"}-contracted
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  printing of 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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  Enabling @{attribute 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 @{attribute goals_limit} controls the maximum number of
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  subgoals to be shown in goal output.
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  \item @{attribute show_main_goal} controls whether the main result
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  to be proven should be displayed.  This information might be
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  relevant for schematic goals, to inspect the current claim that has
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  been synthesized so far.
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  \item @{attribute show_hyps} controls printing of implicit
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  hypotheses of local facts.  Normally, only those hypotheses are
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  displayed that are \emph{not} covered by the assumptions of the
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  current context: this situation indicates a fault in some tool being
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  used.
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  By enabling @{attribute show_hyps}, output of \emph{all} hypotheses
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  can be enforced, which is occasionally useful for diagnostic
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  purposes.
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  \item @{attribute show_tags} controls printing of extra annotations
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  within theorems, such as internal position information, or the case
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  names being attached by the attribute @{attribute case_names}.
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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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  \item @{attribute show_question_marks} controls printing of question
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  marks 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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  \end{description}
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*}
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subsection {* Printing limits *}
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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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  These ML functions set limits for pretty printed text.
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  \begin{description}
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  \item @{ML Pretty.margin_default} indicates the global default for
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  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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  \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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  \end{description}
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*}
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section {* Mixfix annotations *}
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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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  @{rail "
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    @{syntax_def \"infix\"}: '(' (@'infix' | @'infixl' | @'infixr')
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      @{syntax string} @{syntax nat} ')'
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    ;
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    @{syntax_def mixfix}: @{syntax \"infix\"} | '(' @{syntax string} prios? @{syntax nat}? ')' |
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    '(' @'binder' @{syntax string} prios? @{syntax nat} ')'
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    ;
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    @{syntax_def structmixfix}: @{syntax mixfix} | '(' @'structure' ')'
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    ;
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    prios: '[' (@{syntax nat} + ',') ']'
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  "}
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  Here the @{syntax 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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  \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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  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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  \item @{verbatim "_"} is an argument position, which stands for a
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  certain syntactic category in the underlying grammar.
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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
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  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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   333
  \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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   341
  \end{description}
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   343
  For example, the template @{verbatim "(_ +/ _)"} specifies an infix
4510201c6aaf mixfix annotations: verbatim for special symbols;
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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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  The general idea of pretty printing with blocks and breaks is also
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  described in \cite{paulson-ml2}.
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*}
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   353
section {* Explicit notation *}
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   355
text {*
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   356
  \begin{matharray}{rcll}
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   357
    @{command_def "type_notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\
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   358
    @{command_def "no_type_notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\
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   359
    @{command_def "notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\
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   360
    @{command_def "no_notation"} & : & @{text "local_theory \<rightarrow> local_theory"} \\
36508
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   361
    @{command_def "write"} & : & @{text "proof(state) \<rightarrow> proof(state)"} \\
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   362
  \end{matharray}
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   363
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   364
  @{rail "
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   365
    (@@{command type_notation} | @@{command no_type_notation}) @{syntax target}?
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      @{syntax mode}? \\ (@{syntax nameref} @{syntax mixfix} + @'and')
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    ;
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    (@@{command notation} | @@{command no_notation}) @{syntax target}? @{syntax mode}? \\
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      (@{syntax nameref} @{syntax structmixfix} + @'and')
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   370
    ;
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   371
    @@{command write} @{syntax mode}? (@{syntax nameref} @{syntax structmixfix} + @'and')
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   372
  "}
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   374
  \begin{description}
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   375
35413
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   376
  \item @{command "type_notation"}~@{text "c (mx)"} associates mixfix
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   377
  syntax with an existing type constructor.  The arity of the
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   378
  constructor is retrieved from the context.
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   379
  
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   380
  \item @{command "no_type_notation"} is similar to @{command
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   381
  "type_notation"}, but removes the specified syntax annotation from
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   382
  the present context.
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diff changeset
   383
28762
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   384
  \item @{command "notation"}~@{text "c (mx)"} associates mixfix
35413
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diff changeset
   385
  syntax with an existing constant or fixed variable.  The type
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diff changeset
   386
  declaration of the given entity is retrieved from the context.
28762
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diff changeset
   387
  
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
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diff changeset
   388
  \item @{command "no_notation"} is similar to @{command "notation"},
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
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diff changeset
   389
  but removes the specified syntax annotation from the present
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   390
  context.
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diff changeset
   391
36508
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diff changeset
   392
  \item @{command "write"} is similar to @{command "notation"}, but
03d2a2d0ee4a allow concrete syntax for local entities within a proof body, either via regular mixfix annotations to 'fix' etc. or the separate 'write' command;
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diff changeset
   393
  works within an Isar proof body.
03d2a2d0ee4a allow concrete syntax for local entities within a proof body, either via regular mixfix annotations to 'fix' etc. or the separate 'write' command;
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diff changeset
   394
28762
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   395
  \end{description}
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diff changeset
   396
36508
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wenzelm
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diff changeset
   397
  Note that the more primitive commands @{command "syntax"} and
03d2a2d0ee4a allow concrete syntax for local entities within a proof body, either via regular mixfix annotations to 'fix' etc. or the separate 'write' command;
wenzelm
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diff changeset
   398
  @{command "no_syntax"} (\secref{sec:syn-trans}) provide raw access
03d2a2d0ee4a allow concrete syntax for local entities within a proof body, either via regular mixfix annotations to 'fix' etc. or the separate 'write' command;
wenzelm
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diff changeset
   399
  to the syntax tables of a global theory.
28762
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diff changeset
   400
*}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
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diff changeset
   401
28778
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diff changeset
   402
a25630deacaf misc tuning of inner syntax;
wenzelm
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diff changeset
   403
section {* The Pure syntax \label{sec:pure-syntax} *}
28769
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   404
28777
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wenzelm
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diff changeset
   405
subsection {* Priority grammars \label{sec:priority-grammar} *}
28769
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
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diff changeset
   406
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   407
text {* A context-free grammar consists of a set of \emph{terminal
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   408
  symbols}, a set of \emph{nonterminal symbols} and a set of
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   409
  \emph{productions}.  Productions have the form @{text "A = \<gamma>"},
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   410
  where @{text A} is a nonterminal and @{text \<gamma>} is a string of
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   411
  terminals and nonterminals.  One designated nonterminal is called
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   412
  the \emph{root symbol}.  The language defined by the grammar
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   413
  consists of all strings of terminals that can be derived from the
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   414
  root symbol by applying productions as rewrite rules.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   415
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   416
  The standard Isabelle parser for inner syntax uses a \emph{priority
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   417
  grammar}.  Each nonterminal is decorated by an integer priority:
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   418
  @{text "A\<^sup>(\<^sup>p\<^sup>)"}.  In a derivation, @{text "A\<^sup>(\<^sup>p\<^sup>)"} may be rewritten
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   419
  using a production @{text "A\<^sup>(\<^sup>q\<^sup>) = \<gamma>"} only if @{text "p \<le> q"}.  Any
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   420
  priority grammar can be translated into a normal context-free
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   421
  grammar by introducing new nonterminals and productions.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   422
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   423
  \medskip Formally, a set of context free productions @{text G}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   424
  induces a derivation relation @{text "\<longrightarrow>\<^sub>G"} as follows.  Let @{text
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   425
  \<alpha>} and @{text \<beta>} denote strings of terminal or nonterminal symbols.
28774
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wenzelm
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diff changeset
   426
  Then @{text "\<alpha> A\<^sup>(\<^sup>p\<^sup>) \<beta> \<longrightarrow>\<^sub>G \<alpha> \<gamma> \<beta>"} holds if and only if @{text G}
0e25ef17b06b more tuning of Pure grammer;
wenzelm
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diff changeset
   427
  contains some production @{text "A\<^sup>(\<^sup>q\<^sup>) = \<gamma>"} for @{text "p \<le> q"}.
28769
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   428
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   429
  \medskip The following grammar for arithmetic expressions
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   430
  demonstrates how binding power and associativity of operators can be
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   431
  enforced by priorities.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
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diff changeset
   432
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   433
  \begin{center}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   434
  \begin{tabular}{rclr}
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
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diff changeset
   435
  @{text "A\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>)"} & @{text "="} & @{verbatim "("} @{text "A\<^sup>(\<^sup>0\<^sup>)"} @{verbatim ")"} \\
28769
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   436
  @{text "A\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>)"} & @{text "="} & @{verbatim 0} \\
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   437
  @{text "A\<^sup>(\<^sup>0\<^sup>)"} & @{text "="} & @{text "A\<^sup>(\<^sup>0\<^sup>)"} @{verbatim "+"} @{text "A\<^sup>(\<^sup>1\<^sup>)"} \\
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   438
  @{text "A\<^sup>(\<^sup>2\<^sup>)"} & @{text "="} & @{text "A\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "*"} @{text "A\<^sup>(\<^sup>2\<^sup>)"} \\
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   439
  @{text "A\<^sup>(\<^sup>3\<^sup>)"} & @{text "="} & @{verbatim "-"} @{text "A\<^sup>(\<^sup>3\<^sup>)"} \\
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   440
  \end{tabular}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   441
  \end{center}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   442
  The choice of priorities determines that @{verbatim "-"} binds
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   443
  tighter than @{verbatim "*"}, which binds tighter than @{verbatim
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   444
  "+"}.  Furthermore @{verbatim "+"} associates to the left and
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   445
  @{verbatim "*"} to the right.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   446
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   447
  \medskip For clarity, grammars obey these conventions:
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   448
  \begin{itemize}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   449
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   450
  \item All priorities must lie between 0 and 1000.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   451
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   452
  \item Priority 0 on the right-hand side and priority 1000 on the
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   453
  left-hand side may be omitted.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   454
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   455
  \item The production @{text "A\<^sup>(\<^sup>p\<^sup>) = \<alpha>"} is written as @{text "A = \<alpha>
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   456
  (p)"}, i.e.\ the priority of the left-hand side actually appears in
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   457
  a column on the far right.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   458
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   459
  \item Alternatives are separated by @{text "|"}.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   460
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   461
  \item Repetition is indicated by dots @{text "(\<dots>)"} in an informal
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   462
  but obvious way.
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   463
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   464
  \end{itemize}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   465
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   466
  Using these conventions, the example grammar specification above
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   467
  takes the form:
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   468
  \begin{center}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   469
  \begin{tabular}{rclc}
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   470
    @{text A} & @{text "="} & @{verbatim "("} @{text A} @{verbatim ")"} \\
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   471
              & @{text "|"} & @{verbatim 0} & \qquad\qquad \\
28769
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   472
              & @{text "|"} & @{text A} @{verbatim "+"} @{text "A\<^sup>(\<^sup>1\<^sup>)"} & @{text "(0)"} \\
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   473
              & @{text "|"} & @{text "A\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "*"} @{text "A\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   474
              & @{text "|"} & @{verbatim "-"} @{text "A\<^sup>(\<^sup>3\<^sup>)"} & @{text "(3)"} \\
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   475
  \end{tabular}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   476
  \end{center}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   477
*}
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   478
8fc228f21861 added section "Priority grammars" (variant from old ref manual);
wenzelm
parents: 28767
diff changeset
   479
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   480
subsection {* The Pure grammar *}
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   481
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   482
text {*
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   483
  The priority grammar of the @{text "Pure"} theory is defined as follows:
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   484
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   485
  %FIXME syntax for "index" (?)
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   486
  %FIXME "op" versions of ==> etc. (?)
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   487
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   488
  \begin{center}
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   489
  \begin{supertabular}{rclr}
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   490
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   491
  @{syntax_def (inner) any} & = & @{text "prop  |  logic"} \\\\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   492
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   493
  @{syntax_def (inner) prop} & = & @{verbatim "("} @{text prop} @{verbatim ")"} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   494
    & @{text "|"} & @{text "prop\<^sup>(\<^sup>4\<^sup>)"} @{verbatim "::"} @{text type} & @{text "(3)"} \\
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   495
    & @{text "|"} & @{text "any\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "=="} @{text "any\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   496
    & @{text "|"} & @{text "any\<^sup>(\<^sup>3\<^sup>)"} @{text "\<equiv>"} @{text "any\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\
28856
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
wenzelm
parents: 28779
diff changeset
   497
    & @{text "|"} & @{text "prop\<^sup>(\<^sup>3\<^sup>)"} @{verbatim "&&&"} @{text "prop\<^sup>(\<^sup>2\<^sup>)"} & @{text "(2)"} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   498
    & @{text "|"} & @{text "prop\<^sup>(\<^sup>2\<^sup>)"} @{verbatim "==>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   499
    & @{text "|"} & @{text "prop\<^sup>(\<^sup>2\<^sup>)"} @{text "\<Longrightarrow>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   500
    & @{text "|"} & @{verbatim "[|"} @{text prop} @{verbatim ";"} @{text "\<dots>"} @{verbatim ";"} @{text prop} @{verbatim "|]"} @{verbatim "==>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   501
    & @{text "|"} & @{text "\<lbrakk>"} @{text prop} @{verbatim ";"} @{text "\<dots>"} @{verbatim ";"} @{text prop} @{text "\<rbrakk>"} @{text "\<Longrightarrow>"} @{text "prop\<^sup>(\<^sup>1\<^sup>)"} & @{text "(1)"} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   502
    & @{text "|"} & @{verbatim "!!"} @{text idts} @{verbatim "."} @{text prop} & @{text "(0)"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   503
    & @{text "|"} & @{text "\<And>"} @{text idts} @{verbatim "."} @{text prop} & @{text "(0)"} \\
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   504
    & @{text "|"} & @{verbatim OFCLASS} @{verbatim "("} @{text type} @{verbatim ","} @{text logic} @{verbatim ")"} \\
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   505
    & @{text "|"} & @{verbatim SORT_CONSTRAINT} @{verbatim "("} @{text type} @{verbatim ")"} \\
28856
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
wenzelm
parents: 28779
diff changeset
   506
    & @{text "|"} & @{verbatim TERM} @{text logic} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   507
    & @{text "|"} & @{verbatim PROP} @{text aprop} \\\\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   508
28856
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
wenzelm
parents: 28779
diff changeset
   509
  @{syntax_def (inner) aprop} & = & @{verbatim "("} @{text aprop} @{verbatim ")"} \\
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
wenzelm
parents: 28779
diff changeset
   510
    & @{text "|"} & @{text "id  |  longid  |  var  |  "}@{verbatim "_"}@{text "  |  "}@{verbatim "..."} \\
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
wenzelm
parents: 28779
diff changeset
   511
    & @{text "|"} & @{verbatim CONST} @{text "id  |  "}@{verbatim CONST} @{text "longid"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   512
    & @{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)"} \\\\
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   513
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   514
  @{syntax_def (inner) logic} & = & @{verbatim "("} @{text logic} @{verbatim ")"} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   515
    & @{text "|"} & @{text "logic\<^sup>(\<^sup>4\<^sup>)"} @{verbatim "::"} @{text type} & @{text "(3)"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   516
    & @{text "|"} & @{text "id  |  longid  |  var  |  "}@{verbatim "_"}@{text "  |  "}@{verbatim "..."} \\
28856
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
wenzelm
parents: 28779
diff changeset
   517
    & @{text "|"} & @{verbatim CONST} @{text "id  |  "}@{verbatim CONST} @{text "longid"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   518
    & @{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
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   519
    & @{text "|"} & @{verbatim "%"} @{text pttrns} @{verbatim "."} @{text "any\<^sup>(\<^sup>3\<^sup>)"} & @{text "(3)"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   520
    & @{text "|"} & @{text \<lambda>} @{text pttrns} @{verbatim "."} @{text "any\<^sup>(\<^sup>3\<^sup>)"} & @{text "(3)"} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   521
    & @{text "|"} & @{verbatim TYPE} @{verbatim "("} @{text type} @{verbatim ")"} \\\\
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   522
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   523
  @{syntax_def (inner) idt} & = & @{verbatim "("} @{text idt} @{verbatim ")"}@{text "  |  id  |  "}@{verbatim "_"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   524
    & @{text "|"} & @{text id} @{verbatim "::"} @{text type} & @{text "(0)"} \\
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   525
    & @{text "|"} & @{verbatim "_"} @{verbatim "::"} @{text type} & @{text "(0)"} \\\\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   526
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   527
  @{syntax_def (inner) idts} & = & @{text "idt  |  idt\<^sup>(\<^sup>1\<^sup>) idts"} & @{text "(0)"} \\\\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   528
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   529
  @{syntax_def (inner) pttrn} & = & @{text idt} \\\\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   530
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   531
  @{syntax_def (inner) pttrns} & = & @{text "pttrn  |  pttrn\<^sup>(\<^sup>1\<^sup>) pttrns"} & @{text "(0)"} \\\\
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   532
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   533
  @{syntax_def (inner) type} & = & @{verbatim "("} @{text type} @{verbatim ")"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   534
    & @{text "|"} & @{text "tid  |  tvar  |  "}@{verbatim "_"} \\
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   535
    & @{text "|"} & @{text "tid"} @{verbatim "::"} @{text "sort  |  tvar  "}@{verbatim "::"} @{text "sort  |  "}@{verbatim "_"} @{verbatim "::"} @{text "sort"} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   536
    & @{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
wenzelm
parents: 29157
diff changeset
   537
    & @{text "|"} & @{text "longid  |  type\<^sup>(\<^sup>1\<^sup>0\<^sup>0\<^sup>0\<^sup>) longid"} \\
wenzelm
parents: 29157
diff changeset
   538
    & @{text "|"} & @{verbatim "("} @{text type} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text type} @{verbatim ")"} @{text longid} \\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   539
    & @{text "|"} & @{text "type\<^sup>(\<^sup>1\<^sup>)"} @{verbatim "=>"} @{text type} & @{text "(0)"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   540
    & @{text "|"} & @{text "type\<^sup>(\<^sup>1\<^sup>)"} @{text "\<Rightarrow>"} @{text type} & @{text "(0)"} \\
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   541
    & @{text "|"} & @{verbatim "["} @{text type} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text type} @{verbatim "]"} @{verbatim "=>"} @{text type} & @{text "(0)"} \\
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   542
    & @{text "|"} & @{verbatim "["} @{text type} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text type} @{verbatim "]"} @{text "\<Rightarrow>"} @{text type} & @{text "(0)"} \\\\
28772
3f6bc48ebb9b added Pure grammer (from old ref manual);
wenzelm
parents: 28771
diff changeset
   543
29741
wenzelm
parents: 29157
diff changeset
   544
  @{syntax_def (inner) sort} & = & @{text "id  |  longid  |  "}@{verbatim "{}"} \\
wenzelm
parents: 29157
diff changeset
   545
    & @{text "|"} & @{verbatim "{"} @{text "(id | longid)"} @{verbatim ","} @{text "\<dots>"} @{verbatim ","} @{text "(id | longid)"} @{verbatim "}"} \\
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   546
  \end{supertabular}
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   547
  \end{center}
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   548
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   549
  \medskip Here literal terminals are printed @{verbatim "verbatim"};
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   550
  see also \secref{sec:inner-lex} for further token categories of the
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   551
  inner syntax.  The meaning of the nonterminals defined by the above
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   552
  grammar is as follows:
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   553
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   554
  \begin{description}
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   555
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   556
  \item @{syntax_ref (inner) any} denotes any term.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   557
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   558
  \item @{syntax_ref (inner) prop} denotes meta-level propositions,
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   559
  which are terms of type @{typ prop}.  The syntax of such formulae of
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   560
  the meta-logic is carefully distinguished from usual conventions for
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   561
  object-logics.  In particular, plain @{text "\<lambda>"}-term notation is
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   562
  \emph{not} recognized as @{syntax (inner) prop}.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   563
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   564
  \item @{syntax_ref (inner) aprop} denotes atomic propositions, which
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   565
  are embedded into regular @{syntax (inner) prop} by means of an
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   566
  explicit @{verbatim PROP} token.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   567
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   568
  Terms of type @{typ prop} with non-constant head, e.g.\ a plain
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   569
  variable, are printed in this form.  Constants that yield type @{typ
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   570
  prop} are expected to provide their own concrete syntax; otherwise
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   571
  the printed version will appear like @{syntax (inner) logic} and
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   572
  cannot be parsed again as @{syntax (inner) prop}.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   573
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   574
  \item @{syntax_ref (inner) logic} denotes arbitrary terms of a
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   575
  logical type, excluding type @{typ prop}.  This is the main
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   576
  syntactic category of object-logic entities, covering plain @{text
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   577
  \<lambda>}-term notation (variables, abstraction, application), plus
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   578
  anything defined by the user.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   579
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   580
  When specifying notation for logical entities, all logical types
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   581
  (excluding @{typ prop}) are \emph{collapsed} to this single category
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   582
  of @{syntax (inner) logic}.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   583
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   584
  \item @{syntax_ref (inner) idt} denotes identifiers, possibly
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   585
  constrained by types.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   586
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   587
  \item @{syntax_ref (inner) idts} denotes a sequence of @{syntax_ref
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   588
  (inner) idt}.  This is the most basic category for variables in
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   589
  iterated binders, such as @{text "\<lambda>"} or @{text "\<And>"}.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   590
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   591
  \item @{syntax_ref (inner) pttrn} and @{syntax_ref (inner) pttrns}
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   592
  denote patterns for abstraction, cases bindings etc.  In Pure, these
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   593
  categories start as a merely copy of @{syntax (inner) idt} and
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   594
  @{syntax (inner) idts}, respectively.  Object-logics may add
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   595
  additional productions for binding forms.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   596
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   597
  \item @{syntax_ref (inner) type} denotes types of the meta-logic.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   598
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   599
  \item @{syntax_ref (inner) sort} denotes meta-level sorts.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   600
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   601
  \end{description}
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   602
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   603
  Here are some further explanations of certain syntax features.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   604
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   605
  \begin{itemize}
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   606
28778
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   607
  \item In @{syntax (inner) idts}, note that @{text "x :: nat y"} is
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   608
  parsed as @{text "x :: (nat y)"}, treating @{text y} like a type
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   609
  constructor applied to @{text nat}.  To avoid this interpretation,
a25630deacaf misc tuning of inner syntax;
wenzelm
parents: 28777
diff changeset
   610
  write @{text "(x :: nat) y"} with explicit parentheses.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   611
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   612
  \item Similarly, @{text "x :: nat y :: nat"} is parsed as @{text "x ::
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   613
  (nat y :: nat)"}.  The correct form is @{text "(x :: nat) (y ::
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   614
  nat)"}, or @{text "(x :: nat) y :: nat"} if @{text y} is last in the
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   615
  sequence of identifiers.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   616
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   617
  \item Type constraints for terms bind very weakly.  For example,
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   618
  @{text "x < y :: nat"} is normally parsed as @{text "(x < y) ::
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   619
  nat"}, unless @{text "<"} has a very low priority, in which case the
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   620
  input is likely to be ambiguous.  The correct form is @{text "x < (y
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   621
  :: nat)"}.
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   622
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   623
  \item Constraints may be either written with two literal colons
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   624
  ``@{verbatim "::"}'' or the double-colon symbol @{verbatim "\<Colon>"},
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   625
  which actually looks exactly the same in some {\LaTeX} styles.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   626
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   627
  \item Dummy variables (written as underscore) may occur in different
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   628
  roles.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   629
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   630
  \begin{description}
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   631
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   632
  \item A type ``@{text "_"}'' or ``@{text "_ :: sort"}'' acts like an
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   633
  anonymous inference parameter, which is filled-in according to the
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   634
  most general type produced by the type-checking phase.
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   635
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   636
  \item A bound ``@{text "_"}'' refers to a vacuous abstraction, where
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   637
  the body does not refer to the binding introduced here.  As in the
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   638
  term @{term "\<lambda>x _. x"}, which is @{text "\<alpha>"}-equivalent to @{text
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   639
  "\<lambda>x y. x"}.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   640
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   641
  \item A free ``@{text "_"}'' refers to an implicit outer binding.
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   642
  Higher definitional packages usually allow forms like @{text "f x _
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   643
  = x"}.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   644
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   645
  \item A schematic ``@{text "_"}'' (within a term pattern, see
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   646
  \secref{sec:term-decls}) refers to an anonymous variable that is
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   647
  implicitly abstracted over its context of locally bound variables.
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   648
  For example, this allows pattern matching of @{text "{x. f x = g
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   649
  x}"} against @{text "{x. _ = _}"}, or even @{text "{_. _ = _}"} by
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   650
  using both bound and schematic dummies.
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   651
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   652
  \end{description}
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   653
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   654
  \item The three literal dots ``@{verbatim "..."}'' may be also
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   655
  written as ellipsis symbol @{verbatim "\<dots>"}.  In both cases this
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   656
  refers to a special schematic variable, which is bound in the
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   657
  context.  This special term abbreviation works nicely with
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   658
  calculational reasoning (\secref{sec:calculation}).
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   659
28773
39b4cedb8433 updated and elaborated Pure grammer;
wenzelm
parents: 28772
diff changeset
   660
  \end{itemize}
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   661
*}
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   662
28777
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   663
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   664
section {* Lexical matters \label{sec:inner-lex} *}
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   665
28777
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   666
text {* The inner lexical syntax vaguely resembles the outer one
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   667
  (\secref{sec:outer-lex}), but some details are different.  There are
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   668
  two main categories of inner syntax tokens:
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   669
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   670
  \begin{enumerate}
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   671
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   672
  \item \emph{delimiters} --- the literal tokens occurring in
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   673
  productions of the given priority grammar (cf.\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   674
  \secref{sec:priority-grammar});
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   675
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   676
  \item \emph{named tokens} --- various categories of identifiers etc.
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   677
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   678
  \end{enumerate}
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   679
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   680
  Delimiters override named tokens and may thus render certain
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   681
  identifiers inaccessible.  Sometimes the logical context admits
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   682
  alternative ways to refer to the same entity, potentially via
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   683
  qualified names.
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   684
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   685
  \medskip The categories for named tokens are defined once and for
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   686
  all as follows, reusing some categories of the outer token syntax
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   687
  (\secref{sec:outer-lex}).
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   688
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   689
  \begin{center}
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   690
  \begin{supertabular}{rcl}
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   691
    @{syntax_def (inner) id} & = & @{syntax_ref ident} \\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   692
    @{syntax_def (inner) longid} & = & @{syntax_ref longident} \\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   693
    @{syntax_def (inner) var} & = & @{syntax_ref var} \\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   694
    @{syntax_def (inner) tid} & = & @{syntax_ref typefree} \\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   695
    @{syntax_def (inner) tvar} & = & @{syntax_ref typevar} \\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   696
    @{syntax_def (inner) num} & = & @{syntax_ref nat}@{text "  |  "}@{verbatim "-"}@{syntax_ref nat} \\
29157
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   697
    @{syntax_def (inner) float_token} & = & @{syntax_ref nat}@{verbatim "."}@{syntax_ref nat}@{text "  |  "}@{verbatim "-"}@{syntax_ref nat}@{verbatim "."}@{syntax_ref nat} \\
28777
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   698
    @{syntax_def (inner) xnum} & = & @{verbatim "#"}@{syntax_ref nat}@{text "  |  "}@{verbatim "#-"}@{syntax_ref nat} \\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   699
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   700
    @{syntax_def (inner) xstr} & = & @{verbatim "''"} @{text "\<dots>"} @{verbatim "''"} \\
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   701
  \end{supertabular}
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   702
  \end{center}
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   703
29157
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   704
  The token categories @{syntax (inner) num}, @{syntax (inner)
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   705
  float_token}, @{syntax (inner) xnum}, and @{syntax (inner) xstr} are
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   706
  not used in Pure.  Object-logics may implement numerals and string
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   707
  constants by adding appropriate syntax declarations, together with
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   708
  some translation functions (e.g.\ see Isabelle/HOL).
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   709
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   710
  The derived categories @{syntax_def (inner) num_const} and
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   711
  @{syntax_def (inner) float_const} provide robust access to @{syntax
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   712
  (inner) num}, and @{syntax (inner) float_token}, respectively: the
461f34ed79ec added float_token, and num_const, float_const;
wenzelm
parents: 28856
diff changeset
   713
  syntax tree holds a syntactic constant instead of a free variable.
28777
2eeeced17228 added inner lexical syntax, reusing outer one;
wenzelm
parents: 28774
diff changeset
   714
*}
28774
0e25ef17b06b more tuning of Pure grammer;
wenzelm
parents: 28773
diff changeset
   715
28770
93a372e2dc7a added section "The Pure grammar" (incomplete version, based on old ref manual);
wenzelm
parents: 28769
diff changeset
   716
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   717
section {* Syntax and translations \label{sec:syn-trans} *}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   718
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   719
text {*
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   720
  \begin{matharray}{rcl}
41229
d797baa3d57c replaced command 'nonterminals' by slightly modernized version 'nonterminal';
wenzelm
parents: 40879
diff changeset
   721
    @{command_def "nonterminal"} & : & @{text "theory \<rightarrow> theory"} \\
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   722
    @{command_def "syntax"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   723
    @{command_def "no_syntax"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   724
    @{command_def "translations"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   725
    @{command_def "no_translations"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   726
  \end{matharray}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   727
42596
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   728
  @{rail "
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   729
    @@{command nonterminal} (@{syntax name} + @'and')
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   730
    ;
42596
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   731
    (@@{command syntax} | @@{command no_syntax}) @{syntax mode}? (@{syntax constdecl} +)
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   732
    ;
42596
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   733
    (@@{command translations} | @@{command no_translations})
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   734
      (transpat ('==' | '=>' | '<=' | '\<rightleftharpoons>' | '\<rightharpoonup>' | '\<leftharpoondown>') transpat +)
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   735
    ;
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   736
42596
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   737
    mode: ('(' ( @{syntax name} | @'output' | @{syntax name} @'output' ) ')')
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   738
    ;
42596
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   739
    transpat: ('(' @{syntax nameref} ')')? @{syntax string}
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   740
  "}
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   741
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   742
  \begin{description}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   743
  
41229
d797baa3d57c replaced command 'nonterminals' by slightly modernized version 'nonterminal';
wenzelm
parents: 40879
diff changeset
   744
  \item @{command "nonterminal"}~@{text c} declares a type
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   745
  constructor @{text c} (without arguments) to act as purely syntactic
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   746
  type: a nonterminal symbol of the inner syntax.
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   747
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   748
  \item @{command "syntax"}~@{text "(mode) decls"} is similar to
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   749
  @{command "consts"}~@{text decls}, except that the actual logical
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   750
  signature extension is omitted.  Thus the context free grammar of
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   751
  Isabelle's inner syntax may be augmented in arbitrary ways,
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   752
  independently of the logic.  The @{text mode} argument refers to the
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   753
  print mode that the grammar rules belong; unless the @{keyword_ref
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   754
  "output"} indicator is given, all productions are added both to the
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   755
  input and output grammar.
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   756
  
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   757
  \item @{command "no_syntax"}~@{text "(mode) decls"} removes grammar
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   758
  declarations (and translations) resulting from @{text decls}, which
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   759
  are interpreted in the same manner as for @{command "syntax"} above.
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   760
  
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   761
  \item @{command "translations"}~@{text rules} specifies syntactic
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   762
  translation rules (i.e.\ macros): parse~/ print rules (@{text "\<rightleftharpoons>"}),
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   763
  parse rules (@{text "\<rightharpoonup>"}), or print rules (@{text "\<leftharpoondown>"}).
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   764
  Translation patterns may be prefixed by the syntactic category to be
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   765
  used for parsing; the default is @{text logic}.
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   766
  
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   767
  \item @{command "no_translations"}~@{text rules} removes syntactic
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   768
  translation rules, which are interpreted in the same manner as for
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   769
  @{command "translations"} above.
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   770
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   771
  \end{description}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   772
*}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   773
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   774
28779
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   775
section {* Syntax translation functions \label{sec:tr-funs} *}
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   776
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   777
text {*
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   778
  \begin{matharray}{rcl}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   779
    @{command_def "parse_ast_translation"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   780
    @{command_def "parse_translation"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   781
    @{command_def "print_translation"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   782
    @{command_def "typed_print_translation"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   783
    @{command_def "print_ast_translation"} & : & @{text "theory \<rightarrow> theory"} \\
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   784
  \end{matharray}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   785
42596
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   786
  @{rail "
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   787
  ( @@{command parse_ast_translation} | @@{command parse_translation} |
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   788
    @@{command print_translation} | @@{command typed_print_translation} |
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   789
    @@{command print_ast_translation}) ('(' @'advanced' ')')? @{syntax text}
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   790
  "}
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   791
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   792
  Syntax translation functions written in ML admit almost arbitrary
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   793
  manipulations of Isabelle's inner syntax.  Any of the above commands
42596
6c621a9d612a modernized rail diagrams using @{rail} antiquotation;
wenzelm
parents: 42358
diff changeset
   794
  have a single @{syntax text} argument that refers to an ML
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   795
  expression of appropriate type, which are as follows by default:
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   796
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   797
%FIXME proper antiquotations
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   798
\begin{ttbox}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   799
val parse_ast_translation   : (string * (ast list -> ast)) list
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   800
val parse_translation       : (string * (term list -> term)) list
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   801
val print_translation       : (string * (term list -> term)) list
42247
12fe41a92cd5 typed_print_translation: discontinued show_sorts argument;
wenzelm
parents: 41229
diff changeset
   802
val typed_print_translation : (string * (typ -> term list -> term)) list
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   803
val print_ast_translation   : (string * (ast list -> ast)) list
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   804
\end{ttbox}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   805
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   806
  If the @{text "(advanced)"} option is given, the corresponding
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   807
  translation functions may depend on the current theory or proof
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   808
  context.  This allows to implement advanced syntax mechanisms, as
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   809
  translations functions may refer to specific theory declarations or
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   810
  auxiliary proof data.
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   811
30397
b6212ae21656 markup antiquotation options;
wenzelm
parents: 29741
diff changeset
   812
  See also \cite{isabelle-ref} for more information on the general
b6212ae21656 markup antiquotation options;
wenzelm
parents: 29741
diff changeset
   813
  concept of syntax transformations in Isabelle.
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   814
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   815
%FIXME proper antiquotations
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   816
\begin{ttbox}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   817
val parse_ast_translation:
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   818
  (string * (Proof.context -> ast list -> ast)) list
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   819
val parse_translation:
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   820
  (string * (Proof.context -> term list -> term)) list
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   821
val print_translation:
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   822
  (string * (Proof.context -> term list -> term)) list
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   823
val typed_print_translation:
42247
12fe41a92cd5 typed_print_translation: discontinued show_sorts argument;
wenzelm
parents: 41229
diff changeset
   824
  (string * (Proof.context -> typ -> term list -> term)) list
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   825
val print_ast_translation:
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   826
  (string * (Proof.context -> ast list -> ast)) list
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   827
\end{ttbox}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   828
*}
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   829
28779
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   830
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   831
section {* Inspecting the syntax *}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   832
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   833
text {*
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   834
  \begin{matharray}{rcl}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   835
    @{command_def "print_syntax"}@{text "\<^sup>*"} & : & @{text "context \<rightarrow>"} \\
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   836
  \end{matharray}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   837
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   838
  \begin{description}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   839
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   840
  \item @{command "print_syntax"} prints the inner syntax of the
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   841
  current context.  The output can be quite large; the most important
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   842
  sections are explained below.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   843
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   844
  \begin{description}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   845
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   846
  \item @{text "lexicon"} lists the delimiters of the inner token
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   847
  language; see \secref{sec:inner-lex}.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   848
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   849
  \item @{text "prods"} lists the productions of the underlying
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   850
  priority grammar; see \secref{sec:priority-grammar}.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   851
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   852
  The nonterminal @{text "A\<^sup>(\<^sup>p\<^sup>)"} is rendered in plain text as @{text
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   853
  "A[p]"}; delimiters are quoted.  Many productions have an extra
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   854
  @{text "\<dots> => name"}.  These names later become the heads of parse
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   855
  trees; they also guide the pretty printer.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   856
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   857
  Productions without such parse tree names are called \emph{copy
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   858
  productions}.  Their right-hand side must have exactly one
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   859
  nonterminal symbol (or named token).  The parser does not create a
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   860
  new parse tree node for copy productions, but simply returns the
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   861
  parse tree of the right-hand symbol.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   862
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   863
  If the right-hand side of a copy production consists of a single
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   864
  nonterminal without any delimiters, then it is called a \emph{chain
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   865
  production}.  Chain productions act as abbreviations: conceptually,
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   866
  they are removed from the grammar by adding new productions.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   867
  Priority information attached to chain productions is ignored; only
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   868
  the dummy value @{text "-1"} is displayed.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   869
28856
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
wenzelm
parents: 28779
diff changeset
   870
  \item @{text "print modes"} lists the alternative print modes
28779
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   871
  provided by this grammar; see \secref{sec:print-modes}.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   872
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   873
  \item @{text "parse_rules"} and @{text "print_rules"} relate to
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   874
  syntax translations (macros); see \secref{sec:syn-trans}.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   875
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   876
  \item @{text "parse_ast_translation"} and @{text
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   877
  "print_ast_translation"} list sets of constants that invoke
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   878
  translation functions for abstract syntax trees, which are only
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   879
  required in very special situations; see \secref{sec:tr-funs}.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   880
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   881
  \item @{text "parse_translation"} and @{text "print_translation"}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   882
  list the sets of constants that invoke regular translation
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   883
  functions; see \secref{sec:tr-funs}.
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   884
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   885
  \end{description}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   886
  
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   887
  \end{description}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   888
*}
698960f08652 separate section "Inspecting the syntax" for print_syntax;
wenzelm
parents: 28778
diff changeset
   889
28762
f5d79aeffd81 separate chapter "Inner syntax --- the term language";
wenzelm
parents:
diff changeset
   890
end