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add lowerAt and upperAt

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This commit is contained in:
Looly 2023-12-05 12:27:33 +08:00
parent d5196ff687
commit 42e3c66af9
2 changed files with 49 additions and 49 deletions
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75
hutool-core/src/main/java/org/dromara/hutool/core/text/CharSequenceUtil.java
View File

@ -3305,65 +3305,60 @@ public class CharSequenceUtil extends StrValidator {
} }
/** /**
* 方法注释: <br> * 大写对应下标字母
* 〈大写对应下标字母〉
* *
* <pre>例如: str = name,index = 1, return nAme</pre> * <pre>例如: str = name,index = 1, return nAme</pre>
* *
* <p>搜索关键字:</p>
* <tag>大写</tag>
* <tag>大写下标</tag>
* <tag>大写字母</tag>
* <tag>大小写</tag>
*
* @param str 字符串 * @param str 字符串
* @param index 下标 * @param index 下标，支持负数，-1表示最后一个字符
* @return java.lang.String 字符串 * @return 字符串
*/ */
public static String upperIndex(final CharSequence str, final int index) { public static String upperAt(final CharSequence str, int index) {
if (null == str) {
if (str == null) {
return null; return null;
} }
if (str.length() > 0) { // 支持负数
final char charredAt = str.charAt(index); final int length = str.length();
if (Character.isLowerCase(charredAt)) { if (index < 0) {
return subPre(str, index) + Character.toUpperCase(charredAt) + subSuf(str, index + 1); index += length;
} }
if (index < 0 || index >= length) {
return str.toString();
} }
final char c = str.charAt(index);
if (Character.isLowerCase(c)) {
return subPre(str, index) + Character.toUpperCase(c) + subSuf(str, index + 1);
}
return str.toString(); return str.toString();
} }
/** /**
* 方法注释: <br> * 小写对应下标字母<br>
* 〈小写对应下标字母〉 * 例如: str = NAME,index = 1, return NaME
*
* <pre>例如: str = NAME,index = 1, return NaME</pre>
*
* <p>搜索关键字:</p>
* <tag>小写</tag>
* <tag>小写下标</tag>
* <tag>小写字母</tag>
* <tag>大小写</tag>
* *
* @param str 字符串 * @param str 字符串
* @param index 下标 * @param index 下标，支持负数，-1表示最后一个字符
* @return java.lang.String 字符串 * @return 字符串
*/ */
public static String lowerIndex(final CharSequence str, final int index) { public static String lowerAt(final CharSequence str, int index) {
if (str == null) { if (str == null) {
return null; return null;
} }
if (str.length() > 0) { // 支持负数
final char charredAt = str.charAt(index); final int length = str.length();
if (Character.isUpperCase(charredAt)) { if (index < 0) {
return subPre(str, index) + Character.toLowerCase(charredAt) + subSuf(str, index + 1); index += length;
} }
if (index < 0 || index >= length) {
return str.toString();
}
final char c = str.charAt(index);
if (Character.isUpperCase(c)) {
return subPre(str, index) + Character.toLowerCase(c) + subSuf(str, index + 1);
} }
return str.toString(); return str.toString();
@ -3378,7 +3373,7 @@ public class CharSequenceUtil extends StrValidator {
* @return 字符串 * @return 字符串
*/ */
public static String upperFirst(final CharSequence str) { public static String upperFirst(final CharSequence str) {
return upperIndex(str, 0); return upperAt(str, 0);
} }
/** /**
@ -3389,7 +3384,7 @@ public class CharSequenceUtil extends StrValidator {
* @return 字符串 * @return 字符串
*/ */
public static String lowerFirst(final CharSequence str) { public static String lowerFirst(final CharSequence str) {
return lowerIndex(str, 0); return lowerAt(str, 0);
} }
// endregion // endregion

23
hutool-core/src/test/java/org/dromara/hutool/core/text/CharSequenceUtilTest.java
View File

@ -117,6 +117,12 @@ public class CharSequenceUtilTest {
Assertions.assertEquals(41, v.getBytes(CharsetUtil.GBK).length); Assertions.assertEquals(41, v.getBytes(CharsetUtil.GBK).length);
} }
@Test
void subPreTest() {
final String pre = CharSequenceUtil.subPre("abc", 0);
Assertions.assertEquals(StrUtil.EMPTY, pre);
}
@Test @Test
public void startWithTest() { public void startWithTest() {
// https://gitee.com/dromara/hutool/issues/I4MV7Q // https://gitee.com/dromara/hutool/issues/I4MV7Q
@ -337,32 +343,31 @@ public class CharSequenceUtilTest {
} }
@Test @Test
public void upperIndexTest() { void upperAtTest() {
final StringBuilder sb = new StringBuilder("key"); final StringBuilder sb = new StringBuilder("key");
final String s1 = CharSequenceUtil.upperIndex(sb, 0); final String s1 = CharSequenceUtil.upperAt(sb, 0);
Assertions.assertEquals("Key", s1); Assertions.assertEquals("Key", s1);
final String s2 = CharSequenceUtil.upperIndex(sb, 1); final String s2 = CharSequenceUtil.upperAt(sb, 1);
Assertions.assertEquals("kEy", s2); Assertions.assertEquals("kEy", s2);
final String s3 = CharSequenceUtil.upperIndex(sb, 2); final String s3 = CharSequenceUtil.upperAt(sb, 2);
Assertions.assertEquals("keY", s3); Assertions.assertEquals("keY", s3);
} }
@Test @Test
public void lowerIndexTest() { void lowerAtTest() {
final StringBuilder sb = new StringBuilder("KEY"); final StringBuilder sb = new StringBuilder("KEY");
final String s1 = CharSequenceUtil.lowerIndex(sb, 0); final String s1 = CharSequenceUtil.lowerAt(sb, 0);
Assertions.assertEquals("kEY", s1); Assertions.assertEquals("kEY", s1);
final String s2 = CharSequenceUtil.lowerIndex(sb, 1); final String s2 = CharSequenceUtil.lowerAt(sb, 1);
Assertions.assertEquals("KeY", s2); Assertions.assertEquals("KeY", s2);
final String s3 = CharSequenceUtil.lowerIndex(sb, 2); final String s3 = CharSequenceUtil.lowerAt(sb, 2);
Assertions.assertEquals("KEy", s3); Assertions.assertEquals("KEy", s3);
} }
} }