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package com.huaban.analysis.jieba;

import java.util.regex.Pattern;


public class CharacterUtil {
    public static Pattern reSkip = Pattern.compile("(\\d+\\.\\d+|[a-zA-Z0-9]+)");
    private static final char[] connectors = new char[] { '+', '#', '&', '.', '_', '-' };


    public static boolean isChineseLetter(char ch) {
        if (ch >= 0x4E00 && ch <= 0x9FA5)
            return true;
        return false;
    }


    public static boolean isEnglishLetter(char ch) {
        if ((ch >= 0x0041 && ch <= 0x005A) || (ch >= 0x0061 && ch <= 0x007A))
            return true;
        return false;
    }


    public static boolean isDigit(char ch) {
        if (ch >= 0x0030 && ch <= 0x0039)
            return true;
        return false;
    }


    public static boolean isConnector(char ch) {
        for (char connector : connectors)
            if (ch == connector)
                return true;
        return false;
    }


    public static boolean ccFind(char ch) {
        if (isChineseLetter(ch))
            return true;
        if (isEnglishLetter(ch))
            return true;
        if (isDigit(ch))
            return true;
        if (isConnector(ch))
            return true;
        return false;
    }


    /**
     * 全角 to 半角,大写 to 小写
     * 
     * @param input
     *            输入字符
     * @return 转换后的字符
     */
    public static char regularize(char input) {
        if (input == 12288) {
            return 32;
        }
        else if (input > 65280 && input < 65375) {
            return (char) (input - 65248);
        }
        else if (input >= 'A' && input <= 'Z') {
            return (input += 32);
        }
        return input;
    }

}