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add PunyCode

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This commit is contained in:
Looly 2020-12-01 11:55:39 +08:00
parent c99b48a4c4
commit 8761c24e02
2 changed files with 94 additions and 34 deletions
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110
hutool-core/src/main/java/cn/hutool/core/codec/PunyCode.java
View File

@ -1,6 +1,7 @@
package cn.hutool.core.codec;
import cn.hutool.core.exceptions.UtilException;
import cn.hutool.core.lang.Assert;
import cn.hutool.core.util.StrUtil;
/**
@ -20,26 +21,38 @@ public class PunyCode {
private static final int DAMP = 700;
private static final int SKEW = 38;
private static final char DELIMITER = '-';
private static final String PONY_CODE_PREFIX = "xn--";
public static final String PUNY_CODE_PREFIX = "xn--";
/**
* Punycodes a unicode string.
* 将内容编码为PunyCode
*
* @param input Unicode string.
* @return Punycoded string.
* @param input 字符串
* @return PunyCode字符串
* @throws UtilException 计算异常
*/
public static String encode(String input) throws UtilException {
return encode(input, false);
}
/**
* 将内容编码为PunyCode
*
* @param input 字符串
* @param withPrefix 是否包含 "xn--"前缀
* @return PunyCode字符串
* @throws UtilException 计算异常
*/
public static String encode(String input, boolean withPrefix) throws UtilException {
int n = INITIAL_N;
int delta = 0;
int bias = INITIAL_BIAS;
StringBuilder output = new StringBuilder();
// Copy all basic code points to the output
int length = input.length();
final int length = input.length();
int b = 0;
char c;
for (int i = 0; i < length; i++) {
c = input.charAt(i);
char c = input.charAt(i);
if (isBasic(c)) {
output.append(c);
b++;
@ -50,11 +63,11 @@ public class PunyCode {
output.append(DELIMITER);
}
int h = b;
while (h < input.length()) {
while (h < length) {
int m = Integer.MAX_VALUE;
// Find the minimum code point >= n
for (int i = 0; i < input.length(); i++) {
int c = input.charAt(i);
for (int i = 0; i < length; i++) {
final char c = input.charAt(i);
if (c >= n && c < m) {
m = c;
}
@ -64,7 +77,7 @@ public class PunyCode {
}
delta = delta + (m - n) * (h + 1);
n = m;
for (int j = 0; j < input.length(); j++) {
for (int j = 0; j < length; j++) {
int c = input.charAt(j);
if (c < n) {
delta++;
@ -86,8 +99,7 @@ public class PunyCode {
if (q < t) {
break;
}
output.append((char) digit2codepoint(t + (q - t)
% (BASE - t)));
output.append((char) digit2codepoint(t + (q - t) % (BASE - t)));
q = (q - t) / (BASE - t);
}
output.append((char) digit2codepoint(q));
@ -99,18 +111,23 @@ public class PunyCode {
delta++;
n++;
}
if(withPrefix){
output.insert(0, PUNY_CODE_PREFIX);
}
return output.toString();
}
/**
* Decode a punycoded string.
* 解码 PunyCode为字符串
*
* @param input Punycode string
* @return Unicode string.
* @param input PunyCode
* @return 字符串
* @throws UtilException 计算异常
*/
public static String decode(String input) throws UtilException {
input = StrUtil.removePrefixIgnoreCase(input, PONY_CODE_PREFIX);
input = StrUtil.removePrefixIgnoreCase(input, PUNY_CODE_PREFIX);
int n = INITIAL_N;
int i = 0;
int bias = INITIAL_BIAS;
@ -118,21 +135,21 @@ public class PunyCode {
int d = input.lastIndexOf(DELIMITER);
if (d > 0) {
for (int j = 0; j < d; j++) {
char c = input.charAt(j);
if (false == isBasic(c)) {
throw new UtilException("BAD_INPUT");
final char c = input.charAt(j);
if (isBasic(c)) {
output.append(c);
}
output.append(c);
}
d++;
} else {
d = 0;
}
while (d < input.length()) {
final int length = input.length();
while (d < length) {
int oldi = i;
int w = 1;
for (int k = BASE; ; k += BASE) {
if (d == input.length()) {
if (d == length) {
throw new UtilException("BAD_INPUT");
}
int c = input.charAt(d++);
@ -163,10 +180,11 @@ public class PunyCode {
output.insert(i, (char) n);
i++;
}
return output.toString();
}
public static int adapt(int delta, int numpoints, boolean first) {
private static int adapt(int delta, int numpoints, boolean first) {
if (first) {
delta = delta / DAMP;
} else {
@ -181,11 +199,27 @@ public class PunyCode {
return k + ((BASE - TMIN + 1) * delta) / (delta + SKEW);
}
public static boolean isBasic(char c) {
private static boolean isBasic(char c) {
return c < 0x80;
}
public static int digit2codepoint(int d) throws UtilException {
/**
* 将数字转为字符，对应关系为：
* <pre>
* 0 -&gt; a
* 1 -&gt; b
* ...
* 25 -&gt; z
* 26 -&gt; '0'
* ...
* 35 -&gt; '9'
* </pre>
* @param d 输入字符
* @return 转换后的字符
* @throws UtilException 无效字符
*/
private static int digit2codepoint(int d) throws UtilException {
Assert.checkBetween(d, 0, 35);
if (d < 26) {
// 0..25 : 'a'..'z'
return d + 'a';
@ -197,7 +231,22 @@ public class PunyCode {
}
}
public static int codepoint2digit(int c) throws UtilException {
/**
* 将字符转为数字，对应关系为：
* <pre>
* a -&gt; 0
* b -&gt; 1
* ...
* z -&gt; 25
* '0' -&gt; 26
* ...
* '9' -&gt; 35
* </pre>
* @param c 输入字符
* @return 转换后的字符
* @throws UtilException 无效字符
*/
private static int codepoint2digit(int c) throws UtilException {
if (c - '0' < 10) {
// '0'..'9' : 26..35
return c - '0' + 26;
@ -208,11 +257,4 @@ public class PunyCode {
throw new UtilException("BAD_INPUT");
}
}
public static void main(String[] args) {
String strPunycode = PONY_CODE_PREFIX + encode("北京大学");
System.out.println(strPunycode);
String strChinese = decode("xn--1lq90ic7fzpc");
System.out.println(strChinese);
}
}

18
hutool-core/src/test/java/cn/hutool/core/codec/PunyCodeTest.java Normal file
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@ -0,0 +1,18 @@
package cn.hutool.core.codec;
import org.junit.Assert;
import org.junit.Test;
public class PunyCodeTest {
@Test
public void encodeDecodeTest(){
String text = "Hutool编码器";
String strPunyCode = PunyCode.encode(text);
Assert.assertEquals("Hutool-ux9js33tgln", strPunyCode);
String decode = PunyCode.decode("Hutool-ux9js33tgln");
Assert.assertEquals(text, decode);
decode = PunyCode.decode("xn--Hutool-ux9js33tgln");
Assert.assertEquals(text, decode);
}
}