package com.bear.mobile.util;
import org.apache.commons.lang.StringUtils;
public class EmojiUtil {
// 转义时标识
private static final char unicode_separator ='&';
private static final char unicode_prefix ='u';
private static final char separator =':';
private static boolean isEmojiCharacter(int codePoint) {
return (codePoint >=0x2600 && codePoint <=0x27BF)// 杂项符号与符号字体
|| codePoint ==0x303D
|| codePoint ==0x2049
|| codePoint ==0x203C
|| (codePoint >=0x2000 && codePoint <=0x200F)//
|| (codePoint >=0x2028 && codePoint <=0x202F)//
|| codePoint ==0x205F //
|| (codePoint >=0x2065 && codePoint <=0x206F)//
/* 标点符号占用区域*/
|| (codePoint >=0x2100 && codePoint <=0x214F)// 字母符号
|| (codePoint >=0x2300 && codePoint <=0x23FF)// 各种技术符号
|| (codePoint >=0x2B00 && codePoint <=0x2BFF)// 箭头A
|| (codePoint >=0x2900 && codePoint <=0x297F)// 箭头B
|| (codePoint >=0x3200 && codePoint <=0x32FF)// 中文符号
|| (codePoint >=0xD800 && codePoint <=0xDFFF)// 高低位替代符保留区域
|| (codePoint >=0xE000 && codePoint <=0xF8FF)// 私有保留区域
|| (codePoint >=0xFE00 && codePoint <=0xFE0F)// 变异选择器
|| codePoint >=0x10000; // Plane在第二平面以上的，char都不可以存，全部都转
}
/**
* 将带有emoji字符的字符串转换成可见字符标识
*/
public static Stringescape(String src) {
if (StringUtils.isBlank(src)) {
return src;
}
int cpCount = src.codePointCount(0, src.length());
int firCodeIndex = src.offsetByCodePoints(0, 0);
int lstCodeIndex = src.offsetByCodePoints(0, cpCount -1);
StringBuilder sb =new StringBuilder(src.length());
for (int index = firCodeIndex; index <= lstCodeIndex; index ++) {
int codepoint = src.codePointAt(index);
if (isEmojiCharacter(codepoint)) {
String hash = Integer.toHexString(codepoint);
sb.append(unicode_separator).append(hash.length())
.append(unicode_prefix).append(separator).append(hash);
// hash 长度，4位1个字节
index += (hash.length() -1)/4;
}else {
sb.append((char) codepoint);
}
}
return sb.toString();
}
/** 解析可见字符标识字符串 */
public static Stringreverse(String src) {
// 查找对应编码的标识位
if (StringUtils.isBlank(src)) {
return src;
}
StringBuilder sb =new StringBuilder(src.length());
char[] sourceChar = src.toCharArray();
int index =0;
while (index < sourceChar.length) {
if (sourceChar[index] ==unicode_separator) {
if (index +6 >= sourceChar.length) {
sb.append(sourceChar[index]);
index++;
continue;
}
// 自已的格式，与通用unicode格式不能互转
if (sourceChar[index +1] >='4' && sourceChar[index +1] <='6'
&& sourceChar[index +2] ==unicode_prefix
&& sourceChar[index +3] ==separator) {
int length = Integer.parseInt(String.valueOf(sourceChar[index +1]));
char[] hexchars =new char[length]; // 创建一个4至六位的数组，来存储uncode码的HEX值
for (int j =0; j < length; j++) {
char ch = sourceChar[index +4 + j];// 4位识别码
if ((ch >='0' && ch <='9') || (ch >='a' && ch <='f')) {
hexchars[j] = ch;
}else {// 字符范围不对
sb.append(sourceChar[index]);
index++;
break;
}
}
sb.append(Character.toChars(Integer.parseInt(new String(hexchars), 16)));
index += (4 + length);// 4位前缀+4-6位字符码
}else if (sourceChar[index +1] ==unicode_prefix) {// 通用字符的反转
// 因为第二平面之上的，已经采用了我们自己转码格式，所以这里是固定的长度4
char[] hexchars =new char[4];
for (int j =0; j <4; j++) {
char ch = sourceChar[index +2 + j]; // 两位识别码要去掉
if ((ch >='0' && ch <='9') || (ch >='a' && ch <='f')) {
hexchars[j] = ch; // 4位识别码
}else {// 字符范围不对
sb.append(sourceChar[index]);
index++;
break;
}
sb.append(Character.toChars(Integer.parseInt(String.valueOf(hexchars), 16)));
index += (2 +4);// 2位前缀+4位字符码
}
}else {
sb.append(sourceChar[index]);
index++;
continue;
}
}else {
sb.append(sourceChar[index]);
index++;
continue;
}
}
return sb.toString();
}
public static Stringfilter(String src) {
if (src ==null) {
return null;
}
int cpCount = src.codePointCount(0, src.length());
int firCodeIndex = src.offsetByCodePoints(0, 0);
int lstCodeIndex = src.offsetByCodePoints(0, cpCount -1);
StringBuilder sb =new StringBuilder(src.length());
for (int index = firCodeIndex; index <= lstCodeIndex;) {
int codepoint = src.codePointAt(index);
if (!isEmojiCharacter(codepoint)) {
System.err.println("codepoint:" + Integer.toHexString(codepoint));
sb.append((char) codepoint);
}
index += ((Character.isSupplementaryCodePoint(codepoint)) ?2 :1);
}
return sb.toString();
}
}
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