Module engine

Representation of the engine state and many of the details that implement the scoping

Structs

• ArgumentStack
  Stores the argument context for calls in IR evaluation.
• CachedFile
  Unit of cached source code
• Call
  This is a HACK to help Command support both the old AST evaluator and the new IR evaluator at the same time. It should be removed once we are satisfied with the new evaluator.
• Closure
• EngineState
  The core global engine state. This includes all global definitions as well as any global state that will persist for the whole session.
• ErrorHandler
  Describes an error handler stored during IR evaluation.
• ErrorHandlerStack
  Keeps track of error handlers pushed during evaluation of an IR block.
• FileStack
  Files being evaluated, arranged as a stack.
• IsDebugging
• OverlayFrame
• ReplState
• ScopeFrame
• Sequence
  Implements an atomically incrementing sequential series of numbers
• Stack
  A runtime value stack used during evaluation
• StackCallArgGuard
• StackCollectValueGuard
• StackIoGuard
• StateDelta
  A delta (or change set) between the current global state and a possible future global state. Deltas can be applied to the global state to update it to contain both previous state and the state held within the delta.
• StateWorkingSet
  A temporary extension to the global state. This handles bridging between the global state and the additional declarations and scope changes that are not yet part of the global scope.
• UnevaluatedCallInfo
• Variable
• Visibility
  Tells whether a decl is visible or not

Enums

• Argument
  Represents a fully evaluated argument to a call.
• CallImpl
• CommandType
• Redirection
• VirtualPath

Constants

• ENV_VARIABLE_ID
• IN_VARIABLE_ID
• NU_VARIABLE_ID
• UNKNOWN_SPAN_ID

Statics

• DEFAULT_OVERLAY_NAME

Traits

• Command
• CommandClone
• Matcher

Type Aliases

• EnvVars
  Environment variables per overlay