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    1   /**
    2    * Copyright (c) 2008-2011, http://www.snakeyaml.org
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  package org.yaml.snakeyaml.scanner;
    18
    19  import java.util.Arrays;
    20
    21  public final class Constant {
    22      private final static String ALPHA_S = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-_";
    23
    24      private final static String LINEBR_S = "\n\u0085\u2028\u2029";
    25      private final static String FULL_LINEBR_S = "\r" + LINEBR_S;
    26      private final static String NULL_OR_LINEBR_S = "\0" + FULL_LINEBR_S;
    27      private final static String NULL_BL_LINEBR_S = " " + NULL_OR_LINEBR_S;
    28      private final static String NULL_BL_T_LINEBR_S = "\t" + NULL_BL_LINEBR_S;
    29      private final static String NULL_BL_T_S = "\0 \t";
    30      private final static String URI_CHARS_S = ALPHA_S + "-;/?:@&=+$,_.!~*\'()[]%";
    31
    32      public final static Constant LINEBR = new Constant(LINEBR_S);
    33      public final static Constant FULL_LINEBR = new Constant(FULL_LINEBR_S);
    34      public final static Constant NULL_OR_LINEBR = new Constant(NULL_OR_LINEBR_S);
    35      public final static Constant NULL_BL_LINEBR = new Constant(NULL_BL_LINEBR_S);
    36      public final static Constant NULL_BL_T_LINEBR = new Constant(NULL_BL_T_LINEBR_S);
    37      public final static Constant NULL_BL_T = new Constant(NULL_BL_T_S);
    38      public final static Constant URI_CHARS = new Constant(URI_CHARS_S);
    39
    40      public final static Constant ALPHA = new Constant(ALPHA_S);
    41
    42      private String content;
    43      boolean[] contains = new boolean[128];
    44      boolean noASCII = false;
    45
    46      private Constant(String content) {
    47          Arrays.fill(contains, false);
    48          StringBuilder sb = new StringBuilder();
    49          for (int i = 0; i < content.length(); i++) {
    50              char ch = content.charAt(i);
    51              if (ch < 128)
    52                  contains[ch] = true;
    53              else
    54                  sb.append(ch);
    55          }
    56          if (sb.length() > 0) {
    57              noASCII = true;
    58              this.content = sb.toString();
    59          }
    60      }
    61
    62      public boolean has(char ch) {
    63          return (ch < 128) ? contains[ch] : noASCII && content.indexOf(ch, 0) != -1;
    64      }
    65
    66      public boolean hasNo(char ch) {
    67          return !has(ch);
    68      }
    69
    70      public boolean has(char ch, String additional) {
    71          return has(ch) || additional.indexOf(ch, 0) != -1;
    72      }
    73
    74      public boolean hasNo(char ch, String additional) {
    75          return !has(ch, additional);
    76      }
    77  }