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implement additional Unicode support in Character

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Zsombor 2008-07-13 20:33:26 -06:00 committed by Joel Dice
parent 99fa6d1495
commit 0ffba474fa
1 changed files with 75 additions and 0 deletions
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75
classpath/java/lang/Character.java
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@ -58,6 +58,14 @@ public final class Character implements Comparable<Character> {
}
}
public static int toLowerCase(int codePoint) {
if (isSupplementaryCodePoint(codePoint)) {
return codePoint;
} else {
return toLowerCase((char) codePoint);
}
}
public static char toUpperCase(char c) {
if (c >= 'a' && c <= 'z') {
return (char) ((c - 'a') + 'A');
@ -66,10 +74,22 @@ public final class Character implements Comparable<Character> {
}
}
public static int toUpperCase(int codePoint) {
if (isSupplementaryCodePoint(codePoint)) {
return codePoint;
} else {
return toUpperCase((char) codePoint);
}
}
public static boolean isDigit(char c) {
return c >= '0' && c <= '9';
}
public static boolean isDigit(int c) {
return c >= '0' && c <= '9';
}
public static int digit(char c, int radix) {
int digit = 0;
if ((c >= '0') && (c <= '9')) {
@ -87,6 +107,10 @@ public final class Character implements Comparable<Character> {
}
}
public static boolean isLetter(int c) {
return canCastToChar(c) && isLetter((char) c);
}
public static boolean isLetter(char c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
@ -95,6 +119,14 @@ public final class Character implements Comparable<Character> {
return isDigit(c) || isLetter(c);
}
public static boolean isLetterOrDigit(int c) {
return canCastToChar(c) && (isDigit((char) c) || isLetter((char) c));
}
public static boolean isLowerCase(int c) {
return canCastToChar(c) && isLowerCase((char) c);
}
public static boolean isLowerCase(char c) {
return (c >= 'a' && c <= 'z');
}
@ -103,6 +135,14 @@ public final class Character implements Comparable<Character> {
return (c >= 'A' && c <= 'Z');
}
public static boolean isUpperCase(int c) {
return canCastToChar(c) && isUpperCase((char) c);
}
public static boolean isWhitespace(int c) {
return canCastToChar(c) && isWhitespace((char) c);
}
public static boolean isWhitespace(char c) {
return c == ' ' || c == '\t' || c == '\n' || c == '\r';
}
@ -110,4 +150,39 @@ public final class Character implements Comparable<Character> {
public static boolean isSpaceChar(char c) {
return isWhitespace(c);
}
public static boolean isHighSurrogate(char ch) {
return ch >= '\uD800' && ch <= '\uDBFF';
}
public static boolean isLowSurrogate(char ch) {
return ch >= '\uDC00' && ch <= '\uDFFF';
}
public static int toCodePoint(char high, char low) {
return (((high & 0x3FF) << 10) | (low & 0x3FF)) + 0x10000;
}
public static boolean isSupplementaryCodePoint(int codePoint) {
return codePoint >= 0x10000 && codePoint <= 0x10FFFF;
}
private static boolean canCastToChar(int codePoint) {
return (codePoint >= 0 && codePoint <= 0xFFFF);
}
public static char[] toChars(int codePoint) {
if (isSupplementaryCodePoint(codePoint)) {
int cpPrime = codePoint - 0x10000;
int high = 0xD800 | ((cpPrime >> 10) & 0x3FF);
int low = 0xDC00 | (cpPrime & 0x3FF);
return new char[] { (char) high, (char) low };
}
return new char[] { (char) codePoint };
}
public static boolean isSurrogatePair(char high, char low) {
return isHighSurrogate(high) && isLowSurrogate(low);
}
}