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Grammatica 1.4 Documentation
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PerCederberg.Grammatica.Parser.RE
Class AlternativeElement

ICloneable
   |
   +--Element
         |
         +--AlternativeElement

   in AlternativeElement.cs

class AlternativeElement
extends Element

A regular expression alternative element. This element matches the longest alternative element.


Constructor Summary
AlternativeElement( Element first, Element second )
          Creates a new alternative element.
 
Method Summary
 override object Clone()
          Creates a copy of this element.
 override int Match( Matcher m, string str, int start, int skip )
          Returns the length of a matching string starting at the specified position.
 override void PrintTo( TextWriter output, string indent )
          Prints this element to the specified output stream.
   
Methods inherited from class Element
Clone, Match, PrintTo
 

Constructor Detail

AlternativeElement

public AlternativeElement( Element first, Element second );
Creates a new alternative element.
Parameters:
first - the first alternative
second - the second alternative


Method Detail

Clone

public override object Clone();
Creates a copy of this element. The copy will be an instance of the same class matching the same strings. Copies of elements are necessary to allow elements to cache intermediate results while matching strings without interfering with other threads.
Returns:
a copy of this element

Match

public override int Match( Matcher m, string str, int start, int skip );
Returns the length of a matching string starting at the specified position. The number of matches to skip can also be specified, but numbers higher than zero (0) cause a failed match for any element that doesn't attempt to combine other elements.
Parameters:
m - the matcher being used
str - the string to match
start - the starting position
skip - the number of matches to skip
Returns:
the length of the longest matching string, or -1 if no match was found

PrintTo

public override void PrintTo( TextWriter output, string indent );
Prints this element to the specified output stream.
Parameters:
output - the output stream to use
indent - the current indentation

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Grammatica 1.4 Documentation
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