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/*
 * Copyright (c) 2014, Francis Galiegue ([email protected])
 *
 * This software is dual-licensed under:
 *
 * - the Lesser General Public License (LGPL) version 3.0 or, at your option, any
 *   later version;
 * - the Apache Software License (ASL) version 2.0.
 *
 * The text of this file and of both licenses is available at the root of this
 * project or, if you have the jar distribution, in directory META-INF/, under
 * the names LGPL-3.0.txt and ASL-2.0.txt respectively.
 *
 * Direct link to the sources:
 *
 * - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
 * - ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
 */

package com.github.fge.uritemplate.parse;

import com.google.common.base.CharMatcher;

/**
 * Character sets needed by the parsing process
 */
final class CharMatchers
{
    private CharMatchers()
    {
    }

    static final CharMatcher LITERALS;
    static final CharMatcher PERCENT = CharMatcher.is('%');
    static final CharMatcher HEXDIGIT = CharMatcher.inRange('0', '9')
        .or(CharMatcher.inRange('a', 'f')).or(CharMatcher.inRange('A', 'F'))
        .precomputed();

    static {
        final CharMatcher ctl = CharMatcher.JAVA_ISO_CONTROL;
        final CharMatcher spc = CharMatcher.WHITESPACE;
        /*
         * This doesn't include the %: percent-encoded sequences will be
         * handled in the appropriate template parser
         */
        final CharMatcher other = CharMatcher.anyOf("\"'<>\\^`{|}");
        LITERALS = ctl.or(spc).or(other).negate().precomputed();
    }
}