Package org.javacc.parser

Class Lookahead

  • public class Lookahead
extends Expansion
    Describes lookahead rule for a particular expansion or expansion sequence (See Sequence.java). In case this describes the lookahead rule for a single expansion unit, then a sequence is created with this node as the first element, and the expansion unit as the second and last element.

    • Field Detail

      • action_tokens

        private final java.util.List<Token> action_tokens
        Contains the list of tokens that make up the semantic lookahead if any. If this node represents a different kind of lookahead (other than semantic lookahead), then this list contains nothing. If this list contains something, then it is the boolean expression that forms the semantic lookahead. In this case, the following fields "amount" and "la_expansion" are ignored.

      • amount

        private int amount
        The lookahead amount. Its default value essentially gives us infinite lookahead.

      • la_expansion

        private Expansion la_expansion
        The expansion used to determine whether or not to choose the corresponding parse option. This expansion is parsed upto "amount" tokens of lookahead or until a complete match for it is found. Usually, this is the same as the expansion to be parsed.

      • isExplicit

        private boolean isExplicit
        Is set to true if this is an explicit lookahead specification.

    • Constructor Detail

      • Lookahead

        public Lookahead()

    • Method Detail

      • dump

        public java.lang.StringBuffer dump​(int indent,
                                   java.util.Set<Expansion> alreadyDumped)
        Overrides:
        dump in class Expansion

      • getActionTokens

        public java.util.List<Token> getActionTokens()
        Returns:
        the action_tokens

      • setAmount

        public void setAmount​(int amount)
        Parameters:
        amount - the amount to set

      • getAmount

        public int getAmount()
        Returns:
        the amount

      • setLaExpansion

        public void setLaExpansion​(Expansion la_expansion)
        Parameters:
        la_expansion - the la_expansion to set

      • getLaExpansion

        public Expansion getLaExpansion()
        Returns:
        the la_expansion

      • setExplicit

        public void setExplicit​(boolean isExplicit)
        Parameters:
        isExplicit - the isExplicit to set

      • isExplicit

        public boolean isExplicit()
        Returns:
        the isExplicit