Class Action

java.lang.Object
jflex.core.Action
public final class Action extends 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 enum 
    Action.Kind
     

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    final 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)
    final int
    priority
    The priority (i.e.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Action(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

    Modifier and Type
    Method
    Description
    Action
    copyChoice(int length)
    copyChoice.
    boolean
    equals(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.
    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
    String
    toString()
     

    Methods inherited from class Object

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

  • Field Details

    • content

      public final 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 Details

    • Action

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

    • Action

      public Action(Action.Kind kind)
      Creates a new Action object of the specified kind. Only accepts FORWARD_ACTION or BACKWARD_ACTION.
      Parameters:
      kind - the kind of action
      See Also:

  • Method Details

    • 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 String toString()
      Overrides:
      toString in class 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 Object

    • equals

      public boolean equals(Object o)
      Overrides:
      equals in class 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 String lookString()
      String representation of the lookahead kind of this action.
      Returns:
      the string representation