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package com.github.fge.uritemplate;

import com.google.common.base.CharMatcher;

/**
 * Character sets needed by the parsing and expansion processes
 *
 * Those are defined by the RFC, section 1.5. They are used by the expansion
 * process.
 */
public final class CharMatchers
{
    public static final CharMatcher LITERALS;
    public static final CharMatcher PERCENT = CharMatcher.is('%');
    public static final CharMatcher HEXDIGIT = CharMatcher.inRange('0', '9')
        .or(CharMatcher.inRange('a', 'f')).or(CharMatcher.inRange('A', 'F'))
        .precomputed();

    /**
     * The {@code unreserved} character set
     */
    public static final CharMatcher UNRESERVED;
    /**
     * The {@code reserved} character set
     */
    public static final CharMatcher RESERVED_PLUS_UNRESERVED;

    static {
        // reserved
        final CharMatcher reserved = CharMatcher.inRange('a', 'z')
            .or(CharMatcher.inRange('A', 'Z'))
            .or(CharMatcher.inRange('0', '9'))
            .or(CharMatcher.anyOf("-._~"));
        // gen-delims
        final CharMatcher genDelims = CharMatcher.anyOf(":/?#[]@");
        // sub-delims
        final CharMatcher subDelims = CharMatcher.anyOf("!$&'()*+,;=");
        UNRESERVED = reserved.precomputed();
        // "reserved" is gen-delims or sub-delims
        RESERVED_PLUS_UNRESERVED = reserved.or(genDelims).or(subDelims)
            .precomputed();

        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();
    }

    private CharMatchers()
    {
    }
}