Package jflex

Class RegExp

java.lang.Object
jflex.RegExp
Direct Known Subclasses:
RegExp1, RegExp2
public class RegExp extends Object
Stores a regular expression of rules section in a JFlex-specification.

This base class has no content other than its type.

Version:
JFlex 1.7.0

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    (package private) int
    type
    The type of the regular expression.

  • Constructor Summary

    Constructors
    Constructor
    Description
    RegExp(int type)
    Create a new regular expression of the specified type.

  • Method Summary

    Modifier and Type
    Method
    Description
    RegExp
    anyChar()
    Returns a regexp that matches any character: [^]
    boolean
    isCharClass(Macros macros)
    Find out if this regexp is a char class or equivalent to one.
    String
    print(String tab)
    Returns a String-representation of this regular expression with the specified indentation.
    final RegExp
    resolveTilde(Macros macros)
    Recursively convert tilde (upto) expressions into negation and star.
    final RegExp
    rev(Macros macros)
    Create a new regexp that matches the reverse text of this one.
    static final String
    revString(String s)
    revString.
    int
    size(Macros macros)
    The approximate number of NFA states this expression will need (only works correctly after macro expansion and without negation)
    String
    toString()
    Returns a String-representation of this regular expression

    Methods inherited from class java.lang.Object

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

  • Field Details

    • type

      int type
      The type of the regular expression. This field will be filled with values from class sym.java (generated by cup)

  • Constructor Details

    • RegExp

      public RegExp(int type)
      Create a new regular expression of the specified type.
      Parameters:
      type - a value from the cup generated class sym.
      See Also:

  • Method Details

    • print

      public String print(String tab)
      Returns a String-representation of this regular expression with the specified indentation.
      Parameters:
      tab - a String that should contain only space characters and that is inserted in front of standard String-representation pf this object.
      Returns:
      a String object.

    • toString

      public String toString()
      Returns a String-representation of this regular expression
      Overrides:
      toString in class Object
      Returns:
      a String object.

    • isCharClass

      public boolean isCharClass(Macros macros)
      Find out if this regexp is a char class or equivalent to one.
      Parameters:
      macros - for macro expansion
      Returns:
      true if the regexp is equivalent to a char class.

    • size

      public int size(Macros macros)
      The approximate number of NFA states this expression will need (only works correctly after macro expansion and without negation)
      Parameters:
      macros - macro table for expansion
      Returns:
      a int.

    • revString

      public static final String revString(String s)
      revString.
      Parameters:
      s - a String object.
      Returns:
      a String object.

    • resolveTilde

      public final RegExp resolveTilde(Macros macros)
      Recursively convert tilde (upto) expressions into negation and star.
      Parameters:
      macros - the macro table for expansion.
      Returns:
      new RegExp equivalent to the current one, but without upto expressions.

    • anyChar

      public RegExp anyChar()
      Returns a regexp that matches any character: [^]
      Returns:
      the regexp for [^]

    • rev

      public final RegExp rev(Macros macros)
      Create a new regexp that matches the reverse text of this one.
      Parameters:
      macros - a Macros object.
      Returns:
      the reverse regexp