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package edu.washington.cs.knowitall.regex;

import edu.washington.cs.knowitall.regex.Expression.BaseExpression;

/**
 * Static factories for regular expressions over some basic sequences.
 *
 * @author Michael Schmitz 
 */
class RegularExpressionParsers {
    /**
     * Regular expressions over words where sequences are string
     * representations of words.
     */
    public final static RegularExpressionParser word =
        new RegularExpressionParser() {
            @Override public BaseExpression factory(final String string) {
                return new BaseExpression(string) {
                    @Override public boolean apply(final String token) {
                        return string.equals(token);
                    }
                };
            }
        };

    /**
     * Regular expression over characters, as in java.util.Regex.
     */
    public final static RegularExpressionParser character =
        new RegularExpressionParser() {
            @Override public BaseExpression factory(final String string) {
                return new BaseExpression(string) {
                    @Override public boolean apply(final Character token) {
                        return string.equals(token.toString());
                    }
                };
            }
        };
}