Class TraceObserver

Accumulates a full parse trace as an array of ParseEvent objects.

Attach to an ObservableRDParser via withObserver(new TraceObserver()), then inspect observer.events after parsing.

Implements

ParseObserver

Index

Constructors

Properties

Methods

onEnterProduction onError onExitProduction

Constructors

constructor

new TraceObserver(): TraceObserver
Returns TraceObserver

Properties

`Readonly`events

events: ParseEvent[] = []

All events emitted during parsing, in order.

Methods

onEnterProduction

onEnterProduction(production: string, position: number): void
Called when the parser enters a production method.
Parameters
- production: string
  Name of the production rule.
- position: number
  Current position in the source.
Returns void
Implementation of ParseObserver.onEnterProduction
- Defined in src/observable.ts:60

onError

onError(message: string, position: number): void
Called when the parser throws a parse error.
Parameters
- message: string
  The error message.
- position: number
  Current position at the time of failure.
Returns void
Implementation of ParseObserver.onError
- Defined in src/observable.ts:68

onExitProduction

onExitProduction(production: string, position: number, matched: boolean): void
Called when the parser exits a production method.
Parameters
- production: string
  Name of the production rule.
- position: number
  Current position after the attempt.
- matched: boolean
  Whether the production successfully matched input.
Returns void
Implementation of ParseObserver.onExitProduction
- Defined in src/observable.ts:64