Copyright (c) 2008, 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.
/**
 * Copyright (c) 2008, 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++) {
            int c = content.codePointAt(i);
            if (c < 128)
                contains[c] = true;
            else
                sb.appendCodePoint(c);
        }
        if (sb.length() > 0) {
            noASCII = true;
            this.content = sb.toString();
        }
    }

    public boolean has(int c) {
        return (c < 128) ? contains[c] : noASCII && content.indexOf(c, 0) != -1;
    }

    public boolean hasNo(int c) {
        return !has(c);
    }

    public boolean has(int c, String additional) {
        return has(c) || additional.indexOf(c, 0) != -1;
    }

    public boolean hasNo(int c, String additional) {
        return !has(c, additional);
    }
}