Package com.orbit.parse

Record Class LookaheadExpr

java.lang.Object
java.lang.Record
com.orbit.parse.LookaheadExpr
All Implemented Interfaces:
Expr
public record LookaheadExpr(Expr body, boolean positive) extends Record implements Expr
AST node representing a lookahead assertion ((?=body) or (?!body)).

A positive lookahead (positive=true) succeeds when body matches at the current position without consuming any input. A negative lookahead (positive=false) succeeds when body does NOT match.

Instances are immutable and safe for use by multiple concurrent threads.

  • Constructor Summary

    Constructors
    Constructor
    Description
    LookaheadExpr(Expr body, boolean positive)
    Creates a new LookaheadExpr.

  • Method Summary

    Modifier and Type
    Method
    Description
    Expr
    body()
    Returns the value of the body record component.
    final boolean
    equals(Object o)
    Indicates whether some other object is "equal to" this one.
    final int
    hashCode()
    Returns a hash code value for this object.
    boolean
    positive()
    Returns the value of the positive record component.
    final String
    toString()
    Returns a string representation of this record class.

    Methods inherited from class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    Methods inherited from interface com.orbit.parse.Expr

    span

  • Constructor Details

    • LookaheadExpr

      public LookaheadExpr(Expr body, boolean positive)
      Creates a new LookaheadExpr.

  • Method Details

    • toString

      public final String toString()
      Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.
      Specified by:
      toString in class Record
      Returns:
      a string representation of this object

    • hashCode

      public final int hashCode()
      Returns a hash code value for this object. The value is derived from the hash code of each of the record components.
      Specified by:
      hashCode in class Record
      Returns:
      a hash code value for this object

    • equals

      public final boolean equals(Object o)
      Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. Reference components are compared with Objects::equals(Object,Object); primitive components are compared with '=='.
      Specified by:
      equals in class Record
      Parameters:
      o - the object with which to compare
      Returns:
      true if this object is the same as the o argument; false otherwise.

    • body

      public Expr body()
      Returns the value of the body record component.
      Returns:
      the value of the body record component

    • positive

      public boolean positive()
      Returns the value of the positive record component.
      Returns:
      the value of the positive record component