Documentation

Lean.Language.Basic

MessageLog with interactive diagnostics.

Can be created using Diagnostics.empty or Diagnostics.ofMessageLog.

  • Non-interactive message log.

  • interactiveDiagsRef? : Option (IO.Ref (Option Dynamic))

    Dynamic mutable slot usable by the language server for memorizing interactive diagnostics. If none, interactive diagnostics are not remembered, which should only be used for messages not containing any interactive elements as client-side state will be lost on recreating a diagnostic.

    See also section "Communication" in Lean/Server/README.md.

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    The empty set of diagnostics.

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      The base class of all snapshots: all the generic information the language server needs about a snapshot.

      • desc : String

        Debug description shown by trace.Elab.snapshotTree, defaults to the caller's decl name.

      • The messages produced by this step. The union of message logs of all finished snapshots is reported to the user.

      • General elaboration metadata produced by this step.

      • isFatal : Bool

        Whether it should be indicated to the user that a fatal error (which should be part of diagnostics) occurred that prevents processing of the remainder of the file.

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        A task producing some snapshot type (usually a subclass of Snapshot).

        • Range that is marked as being processed by the server while the task is running. If none, the range of the outer task if some or else the entire file is reported.

        • task : Task α

          Underlying task producing the snapshot.

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          • Lean.Language.instInhabitedSnapshotTask = { default := { range? := default, task := default } }

          Creates a snapshot task from a reporting range and a BaseIO action.

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            Creates a finished snapshot task.

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              Explicitly cancels a tasks. Like with basic Taskss, cancellation happens implicitly when the last reference to the task is dropped if it is not an I/O task.

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                Transforms a task's output without changing the reporting range.

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                  Chains two snapshot tasks. The range is taken from the first task if not specified; the range of the second task is discarded.

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                  • t.bind act range? sync = { range? := range?, task := t.task.bind (fun (x : α) => (act x).task) Task.Priority.default sync }
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                    Chains two snapshot tasks. The range is taken from the first task if not specified; the range of the second task is discarded.

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                      Synchronously waits on the result of the task.

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                      • t.get = t.task.get
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                        Returns task result if already finished or else none.

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                          Arbitrary value paired with a syntax that should be inspected when considering the value for reuse.

                          • Syntax to be inspected for reuse.

                          • val : α

                            Potentially reusable value.

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                            Pair of (optional) old snapshot task usable for incremental reuse and new snapshot promise for incremental reporting. Inside the elaborator, we build snapshots by carrying such bundles and then checking if we can reuse old? if set or else redoing the corresponding elaboration step. In either case, we derive new bundles for nested snapshots, if any, and finally resolve new to the result.

                            Note that failing to resolve a created promise will block the language server indefinitely! We use withAlwaysResolvedPromise/withAlwaysResolvedPromises to ensure this doesn't happen.

                            In the future, the 1-element history old? may be replaced with a global cache indexed by strong hashes but the promise will still need to be passed through the elaborator.

                            • Snapshot task of corresponding elaboration in previous document version if any, paired with its old syntax to be considered for reuse. Should be set to none as soon as reuse can be ruled out.

                            • new : IO.Promise α

                              Promise of snapshot value for the current document. When resolved, the language server will report its result even before the current elaborator invocation has finished.

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                              def Lean.Language.withAlwaysResolvedPromise {m : TypeType u_1} {α : Type} {β : Type} [Monad m] [MonadLiftT BaseIO m] [MonadFinally m] [Inhabited α] (act : IO.Promise αm β) :
                              m β

                              Runs act with a newly created promise and finally resolves it to default if not done by act.

                              Always resolving promises involved in the snapshot tree is important to avoid deadlocking the language server.

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                                def Lean.Language.withAlwaysResolvedPromises {m : TypeType u_1} {α : Type} [Monad m] [MonadLiftT BaseIO m] [MonadFinally m] [Inhabited α] (count : Nat) (act : Array (IO.Promise α)m Unit) :

                                Runs act with count newly created promises and finally resolves them to default if not done by act.

                                Always resolving promises involved in the snapshot tree is important to avoid deadlocking the language server.

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                                  Tree of snapshots where each snapshot comes with an array of asynchronous further subtrees. Used for asynchronously collecting information about the entirety of snapshots in the language server. The involved tasks may form a DAG on the Task dependency level but this is not captured by this data structure.

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                                    The immediately available element of the snapshot tree node.

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                                      The asynchronously available children of the snapshot tree node.

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                                        Produces debug tree format of given snapshot tree, synchronously waiting on all children.

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                                          Helper class for projecting a heterogeneous hierarchy of snapshot classes to a homogeneous representation.

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                                            Snapshot type without child nodes.

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                                                Arbitrary snapshot type, used for extensibility.

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                                                  Returns the original snapshot value if it is of the given type.

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                                                    Runs a tree of snapshots to conclusion, incrementally performing f on each snapshot in tree preorder.

                                                    Option for printing end position of each message in addition to start position. Used for testing message ranges in the test suite.

                                                    Reports messages on stdout. If json is true, prints messages as JSON (one per line).

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                                                      Runs a tree of snapshots to conclusion and incrementally report messages on stdout. Messages are reported in tree preorder. This function is used by the cmdline driver; see Lean.Server.FileWorker.reportSnapshots for how the language server reports snapshots asynchronously.

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                                                        Waits on and returns all snapshots in the tree.

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                                                          Context of an input processing invocation.

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                                                              @[reducible, inline]
                                                              abbrev Lean.Language.ProcessingT (m : TypeType u_1) (α : Type) :
                                                              Type u_1

                                                              Monad transformer holding all relevant data for processing.

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                                                                @[reducible, inline]

                                                                Monad holding all relevant data for processing.

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                                                                  Creates snapshot message log from non-interactive message log, also allocating a mutable cell that can be used by the server to memorize interactive diagnostics derived from the log.

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                                                                    Creates diagnostics from a single error message that should span the whole file.

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                                                                      Adds unexpected exceptions from header processing to the message log as a last resort; standard errors should already have been caught earlier.

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                                                                        def Lean.Language.mkIncrementalProcessor {InitSnap : Type} (process : Option InitSnapLean.Language.ProcessingM InitSnap) :

                                                                        Builds a function for processing a language using incremental snapshots by passing the previous snapshot to Language.process on subsequent invocations.

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