218 lines
9.3 KiB
Plaintext
218 lines
9.3 KiB
Plaintext
import Pantograph.Goal
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import Pantograph.Protocol
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import Pantograph.Serial
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import Pantograph.Environment
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import Pantograph.Library
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import Lean.Data.HashMap
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namespace Pantograph
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structure Context where
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imports: List String
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/-- Stores state of the REPL -/
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structure State where
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options: Protocol.Options := {}
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nextId: Nat := 0
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goalStates: Lean.HashMap Nat GoalState := Lean.HashMap.empty
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/-- Main state monad for executing commands -/
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abbrev MainM := ReaderT Context (StateT State Lean.CoreM)
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-- HACK: For some reason writing `CommandM α := MainM (Except ... α)` disables
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-- certain monadic features in `MainM`
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abbrev CR α := Except Protocol.InteractionError α
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def runMetaM { α } (metaM: Lean.MetaM α): Lean.CoreM α :=
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metaM.run'
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def runTermElabM { α } (termElabM: Lean.Elab.TermElabM α): Lean.CoreM α :=
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termElabM.run' (ctx := {
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declName? := .none,
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errToSorry := false,
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}) |>.run'
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def execute (command: Protocol.Command): MainM Lean.Json := do
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let run { α β: Type } [Lean.FromJson α] [Lean.ToJson β] (comm: α → MainM (CR β)): MainM Lean.Json :=
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match Lean.fromJson? command.payload with
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| .ok args => do
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match (← comm args) with
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| .ok result => return Lean.toJson result
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| .error ierror => return Lean.toJson ierror
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| .error error => return Lean.toJson $ errorCommand s!"Unable to parse json: {error}"
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match command.cmd with
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| "reset" => run reset
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| "stat" => run stat
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| "expr.echo" => run expr_echo
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| "env.catalog" => run env_catalog
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| "env.inspect" => run env_inspect
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| "env.add" => run env_add
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| "options.set" => run options_set
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| "options.print" => run options_print
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| "goal.start" => run goal_start
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| "goal.tactic" => run goal_tactic
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| "goal.continue" => run goal_continue
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| "goal.delete" => run goal_delete
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| "goal.print" => run goal_print
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| cmd =>
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let error: Protocol.InteractionError :=
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errorCommand s!"Unknown command {cmd}"
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return Lean.toJson error
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where
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errorI (type desc: String): Protocol.InteractionError := { error := type, desc := desc }
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errorCommand := errorI "command"
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errorIndex := errorI "index"
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-- Command Functions
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reset (_: Protocol.Reset): MainM (CR Protocol.StatResult) := do
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let state ← get
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let nGoals := state.goalStates.size
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set { state with nextId := 0, goalStates := Lean.HashMap.empty }
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return .ok { nGoals }
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stat (_: Protocol.Stat): MainM (CR Protocol.StatResult) := do
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let state ← get
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let nGoals := state.goalStates.size
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return .ok { nGoals }
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env_catalog (args: Protocol.EnvCatalog): MainM (CR Protocol.EnvCatalogResult) := do
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let result ← Environment.catalog args
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return .ok result
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env_inspect (args: Protocol.EnvInspect): MainM (CR Protocol.EnvInspectResult) := do
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let state ← get
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Environment.inspect args state.options
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env_add (args: Protocol.EnvAdd): MainM (CR Protocol.EnvAddResult) := do
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Environment.addDecl args
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expr_echo (args: Protocol.ExprEcho): MainM (CR Protocol.ExprEchoResult) := do
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let state ← get
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let env ← Lean.MonadEnv.getEnv
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let syn ← match syntax_from_str env args.expr with
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| .error str => return .error $ errorI "parsing" str
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| .ok syn => pure syn
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runTermElabM (do
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match ← syntax_to_expr syn with
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| .error str => return .error $ errorI "elab" str
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| .ok expr => do
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try
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let type ← Lean.Meta.inferType expr
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return .ok {
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type := (← serialize_expression (options := state.options) type),
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expr := (← serialize_expression (options := state.options) expr)
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}
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catch exception =>
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return .error $ errorI "typing" (← exception.toMessageData.toString))
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options_set (args: Protocol.OptionsSet): MainM (CR Protocol.OptionsSetResult) := do
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let state ← get
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let options := state.options
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set { state with
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options := {
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-- FIXME: This should be replaced with something more elegant
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printJsonPretty := args.printJsonPretty?.getD options.printJsonPretty,
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printExprPretty := args.printExprPretty?.getD options.printExprPretty,
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printExprAST := args.printExprAST?.getD options.printExprAST,
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noRepeat := args.noRepeat?.getD options.noRepeat,
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printAuxDecls := args.printAuxDecls?.getD options.printAuxDecls,
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printImplementationDetailHyps := args.printImplementationDetailHyps?.getD options.printImplementationDetailHyps
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}
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}
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return .ok { }
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options_print (_: Protocol.OptionsPrint): MainM (CR Protocol.OptionsPrintResult) := do
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return .ok (← get).options
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goal_start (args: Protocol.GoalStart): MainM (CR Protocol.GoalStartResult) := do
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let state ← get
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let env ← Lean.MonadEnv.getEnv
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let expr?: Except _ GoalState ← runTermElabM (match args.expr, args.copyFrom with
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| .some expr, .none =>
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(match syntax_from_str env expr with
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| .error str => return .error <| errorI "parsing" str
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| .ok syn => do
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(match ← syntax_to_expr syn with
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| .error str => return .error <| errorI "elab" str
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| .ok expr => return .ok (← GoalState.create expr)))
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| .none, .some copyFrom =>
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(match env.find? <| copyFrom.toName with
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| .none => return .error <| errorIndex s!"Symbol not found: {copyFrom}"
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| .some cInfo => return .ok (← GoalState.create cInfo.type))
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| _, _ =>
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return .error <| errorI "arguments" "Exactly one of {expr, copyFrom} must be supplied")
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match expr? with
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| .error error => return .error error
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| .ok goalState =>
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let stateId := state.nextId
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set { state with
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goalStates := state.goalStates.insert stateId goalState,
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nextId := state.nextId + 1
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}
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return .ok { stateId, root := goalState.root.name.toString }
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goal_tactic (args: Protocol.GoalTactic): MainM (CR Protocol.GoalTacticResult) := do
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let state ← get
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match state.goalStates.find? args.stateId with
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| .none => return .error $ errorIndex s!"Invalid state index {args.stateId}"
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| .some goalState => do
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let nextGoalState?: Except _ GoalState ← match args.tactic?, args.expr? with
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| .some tactic, .none => do
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pure ( Except.ok (← runTermElabM <| GoalState.execute goalState args.goalId tactic))
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| .none, .some expr => do
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pure ( Except.ok (← runTermElabM <| GoalState.tryAssign goalState args.goalId expr))
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| _, _ => pure (Except.error <| errorI "arguments" "Exactly one of {tactic, expr} must be supplied")
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match nextGoalState? with
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| .error error => return .error error
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| .ok (.success nextGoalState) =>
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let nextStateId := state.nextId
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set { state with
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goalStates := state.goalStates.insert state.nextId nextGoalState,
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nextId := state.nextId + 1,
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}
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let goals ← nextGoalState.serializeGoals (parent := .some goalState) (options := state.options) |>.run'
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return .ok {
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nextStateId? := .some nextStateId,
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goals? := .some goals,
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}
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| .ok (.parseError message) =>
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return .ok { parseError? := .some message }
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| .ok (.indexError goalId) =>
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return .error $ errorIndex s!"Invalid goal id index {goalId}"
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| .ok (.failure messages) =>
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return .ok { tacticErrors? := .some messages }
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goal_continue (args: Protocol.GoalContinue): MainM (CR Protocol.GoalContinueResult) := do
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let state ← get
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match state.goalStates.find? args.target with
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| .none => return .error $ errorIndex s!"Invalid state index {args.target}"
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| .some target => do
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let nextState? ← match args.branch?, args.goals? with
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| .some branchId, .none => do
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match state.goalStates.find? branchId with
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| .none => return .error $ errorIndex s!"Invalid state index {branchId}"
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| .some branch => pure $ target.continue branch
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| .none, .some goals =>
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let goals := goals.map (λ name => { name := name.toName })
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pure $ target.resume goals
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| _, _ => return .error <| errorI "arguments" "Exactly one of {branch, goals} must be supplied"
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match nextState? with
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| .error error => return .error <| errorI "structure" error
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| .ok nextGoalState =>
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let nextStateId := state.nextId
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set { state with
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goalStates := state.goalStates.insert nextStateId nextGoalState,
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nextId := state.nextId + 1
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}
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let goals ← nextGoalState.serializeGoals (parent := .none) (options := state.options) |>.run'
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return .ok {
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nextStateId,
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goals,
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}
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goal_delete (args: Protocol.GoalDelete): MainM (CR Protocol.GoalDeleteResult) := do
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let state ← get
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let goalStates := args.stateIds.foldl (λ map id => map.erase id) state.goalStates
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set { state with goalStates }
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return .ok {}
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goal_print (args: Protocol.GoalPrint): MainM (CR Protocol.GoalPrintResult) := do
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let state ← get
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match state.goalStates.find? args.stateId with
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| .none => return .error $ errorIndex s!"Invalid state index {args.stateId}"
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| .some goalState => runMetaM <| do
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goalState.restoreMetaM
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let root? ← goalState.rootExpr?.mapM (λ expr => serialize_expression state.options expr)
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let parent? ← goalState.parentExpr?.mapM (λ expr => serialize_expression state.options expr)
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return .ok {
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root?,
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parent?,
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}
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end Pantograph
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