/**

  * Copyright (c) 2008-2011, http://www.snakeyaml.org

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.yaml.snakeyaml.scanner;

 import java.util.Arrays;

 public final class Constant {

     private final static String ALPHA_S = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-_";

     private final static String LINEBR_S = "\n\u0085\u2028\u2029";

     private final static String FULL_LINEBR_S = "\r" + LINEBR_S;

     private final static String NULL_OR_LINEBR_S = "\0" + FULL_LINEBR_S;

     private final static String NULL_BL_LINEBR_S = " " + NULL_OR_LINEBR_S;

     private final static String NULL_BL_T_LINEBR_S = "\t" + NULL_BL_LINEBR_S;

     private final static String NULL_BL_T_S = "\0 \t";

     private final static String URI_CHARS_S = ALPHA_S + "-;/?:@&=+$,_.!~*\'()[]%";

     public final static Constant LINEBR = new Constant(LINEBR_S);

     public final static Constant FULL_LINEBR = new Constant(FULL_LINEBR_S);

     public final static Constant NULL_OR_LINEBR = new Constant(NULL_OR_LINEBR_S);

     public final static Constant NULL_BL_LINEBR = new Constant(NULL_BL_LINEBR_S);

     public final static Constant NULL_BL_T_LINEBR = new Constant(NULL_BL_T_LINEBR_S);

     public final static Constant NULL_BL_T = new Constant(NULL_BL_T_S);

     public final static Constant URI_CHARS = new Constant(URI_CHARS_S);

     public final static Constant ALPHA = new Constant(ALPHA_S);

     private String content;

     boolean[] contains = new boolean[128];

     boolean noASCII = false;

     private Constant(String content) {

         Arrays.fill(contains, false);

         StringBuilder sb = new StringBuilder();

         for (int i = 0; i < content.length(); i++) {

             char ch = content.charAt(i);

             if (ch < 128)

                 contains[ch] = true;

             else

                 sb.append(ch);

         }

         if (sb.length() > 0) {

             noASCII = true;

             this.content = sb.toString();

         }

     }

     public boolean has(char ch) {

         return (ch < 128) ? contains[ch] : noASCII && content.indexOf(ch, 0) != -1;

     }

     public boolean hasNo(char ch) {

         return !has(ch);

     }

     public boolean has(char ch, String additional) {

         return has(ch) || additional.indexOf(ch, 0) != -1;

     }

     public boolean hasNo(char ch, String additional) {

         return !has(ch, additional);

     }

 }