Package jflex.core

Class Action

  • public final class Action
extends java.lang.Object
    Encapsulates an action in the specification.

    It stores the Java code as String together with a priority (line number in the specification).

    Version:
    JFlex 1.9.1

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static class  Action.Kind  

    • Field Summary

      Fields 
      Modifier and Type Field Description
      java.lang.String content
      The Java code this Action represents
      private int entryState
      The entry state of the corresponding forward DFA (if general lookahead)
      private Action.Kind kind
      Which kind of action this is.
      private int len
      The length of the lookahead (if fixed)
      int priority
      The priority (i.e.

    • Constructor Summary

      Constructors 
      Constructor Description
      Action​(java.lang.String content, int priority)
      Creates a new Action object with specified content and line number.
      Action​(Action.Kind kind)
      Creates a new Action object of the specified kind.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Action copyChoice​(int length)
      copyChoice.
      boolean equals​(java.lang.Object o)  
      int getEntryState()
      Return the corresponding entry state for the forward DFA (if this is a general lookahead expression)
      Action getHigherPriority​(Action other)
      Compares the priority value of this Action with the specified action.
      int getLookLength()
      The length of the lookahead or base if this is a fixed length lookahead action.
      int hashCode()  
      boolean isEmittable()
      Return true if code for this is action should be emitted, false if it is a BACK/FORWARD lookahead action.
      boolean isEquiv​(Action a)
      Returns true iff the parameter is an Action with the same content as this one.
      boolean isGenLookAction()
      Return true iff this is action belongs to a general lookahead rule.
      Action.Kind lookAhead()
      Return kind of lookahead.
      java.lang.String lookString()
      String representation of the lookahead kind of this action.
      void setEntryState​(int entryState)
      Set the corresponding entry state for the forward DFA of this action (if this is a general lookahead expression)
      void setLookAction​(Action.Kind kind, int data)
      Sets the lookahead kind and data for this action
      java.lang.String toString()  

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • content

        public final java.lang.String content
        The Java code this Action represents

      • priority

        public final int priority
        The priority (i.e. line number in the specification) of this Action.

      • kind

        private Action.Kind kind
        Which kind of action this is. (normal, a/b with fixed length a, fixed length b, etc)

      • len

        private int len
        The length of the lookahead (if fixed)

      • entryState

        private int entryState
        The entry state of the corresponding forward DFA (if general lookahead)

    • Constructor Detail

      • Action

        public Action​(java.lang.String content,
              int priority)
        Creates a new Action object with specified content and line number.
        Parameters:
        content - java code
        priority - line number

    • Method Detail

      • getHigherPriority

        public Action getHigherPriority​(Action other)
        Compares the priority value of this Action with the specified action.
        Parameters:
        other - the other Action to compare this Action with.
        Returns:
        this Action if it has higher priority - the specified one, if not.

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • isEquiv

        public boolean isEquiv​(Action a)
        Returns true iff the parameter is an Action with the same content as this one.
        Parameters:
        a - the object to compare this Action with
        Returns:
        true if the action strings are equal

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object

      • equals

        public boolean equals​(java.lang.Object o)
        Overrides:
        equals in class java.lang.Object

      • isGenLookAction

        public boolean isGenLookAction()
        Return true iff this is action belongs to a general lookahead rule.
        Returns:
        true if this actions belongs to a general lookahead rule.

      • isEmittable

        public boolean isEmittable()
        Return true if code for this is action should be emitted, false if it is a BACK/FORWARD lookahead action.
        Returns:
        true if code should be emitted for this action.

      • lookAhead

        public Action.Kind lookAhead()
        Return kind of lookahead.
        Returns:
        a int.

      • setLookAction

        public void setLookAction​(Action.Kind kind,
                          int data)
        Sets the lookahead kind and data for this action
        Parameters:
        kind - which kind of lookahead it is
        data - the length for fixed length lookaheads.

      • getLookLength

        public int getLookLength()
        The length of the lookahead or base if this is a fixed length lookahead action.
        Returns:
        a int.

      • getEntryState

        public int getEntryState()
        Return the corresponding entry state for the forward DFA (if this is a general lookahead expression)
        Returns:
        the forward DFA entry state (+1 is the backward DFA)

      • setEntryState

        public void setEntryState​(int entryState)
        Set the corresponding entry state for the forward DFA of this action (if this is a general lookahead expression)
        Parameters:
        entryState - a int.

      • copyChoice

        public Action copyChoice​(int length)
        copyChoice.
        Parameters:
        length - a int.
        Returns:
        a Action object.

      • lookString

        public java.lang.String lookString()
        String representation of the lookahead kind of this action.
        Returns:
        the string representation