//
// This software is now distributed according to
// the Lesser Gnu Public License.  Please see
// http://www.gnu.org/copyleft/lesser.txt for
// the details.
//    -- Happy Computing!
//
package com.stevesoft.pat;

/**
 * This is the same as Skip, except it needs a minimum of two characters in the
 * initializing String.
 * 
 * @see com.stevesoft.pat.Skip
 * @see com.stevesoft.pat.SkipBMH
 */
public class Skip2 extends Skip
{
  int c1, mask1;

  public Skip2(String s, boolean ign, int offset)
  {
    super(s, ign, offset);
    c1 = s.charAt(1);
    m1 = 2 == s.length();
    if (ign)
    {
      mask1 = mkmask(c1);
    }
    else
    {
      mask1 = 0;
    }
  }

  public int find(StringLike s, int start, int end)
  {
    if (start > end)
    {
      return -1;
    }
    start += offset;
    int vend = min(s.length() - 2, end + offset);
    for (int i = start; i <= vend; i++)
    {
      if (0 == (s.charAt(i) & mask) && 0 == (s.charAt(i + 1) & mask1))
      {
        // if(m1||s.regionMatches(ign,i,src,0,src.length()) )
        if (m1 || CaseMgr.regionMatches(s, ign, i, src, 0, src.length()))
        {
          return i - offset;
        }
      }
    }
    return -1;
  }
}