Class DecisionEventInfo

java.lang.Object
org.graalvm.shadowed.org.antlr.v4.runtime.atn.DecisionEventInfo
Direct Known Subclasses:
AmbiguityInfo, ContextSensitivityInfo, ErrorInfo, LookaheadEventInfo, PredicateEvalInfo
public class DecisionEventInfo extends Object
This is the base class for gathering detailed information about prediction events which occur during parsing. Note that we could record the parser call stack at the time this event occurred but in the presence of left recursive rules, the stack is kind of meaningless. It's better to look at the individual configurations for their individual stacks. Of course that is a PredictionContext object not a parse tree node and so it does not have information about the extent (start...stop) of the various subtrees. Examining the stack tops of all configurations provide the return states for the rule invocations. From there you can get the enclosing rule.
Since:
4.3

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    final ATNConfigSet
    configs
    The configuration set containing additional information relevant to the prediction state when the current event occurred, or null if no additional information is relevant or available.
    final int
    decision
    The invoked decision number which this event is related to.
    final boolean
    fullCtx
    true if the current event occurred during LL prediction; otherwise, false if the input occurred during SLL prediction.
    final TokenStream
    input
    The input token stream which is being parsed.
    final int
    startIndex
    The token index in the input stream at which the current prediction was originally invoked.
    final int
    stopIndex
    The token index in the input stream at which the current event occurred.

  • Constructor Summary

    Constructors
    Constructor
    Description
    DecisionEventInfo(int decision, ATNConfigSet configs, TokenStream input, int startIndex, int stopIndex, boolean fullCtx)
     

  • Method Summary

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • decision

      public final int decision
      The invoked decision number which this event is related to.
      See Also:

    • configs

      public final ATNConfigSet configs
      The configuration set containing additional information relevant to the prediction state when the current event occurred, or null if no additional information is relevant or available.

    • input

      public final TokenStream input
      The input token stream which is being parsed.

    • startIndex

      public final int startIndex
      The token index in the input stream at which the current prediction was originally invoked.

    • stopIndex

      public final int stopIndex
      The token index in the input stream at which the current event occurred.

    • fullCtx

      public final boolean fullCtx
      true if the current event occurred during LL prediction; otherwise, false if the input occurred during SLL prediction.

  • Constructor Details

    • DecisionEventInfo

      public DecisionEventInfo(int decision, ATNConfigSet configs, TokenStream input, int startIndex, int stopIndex, boolean fullCtx)