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8223775: String::stripIndent (Preview)

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Reviewed-by: abuckley, vromero, jlahoda, bchristi, rriggs, smarks
This commit is contained in:
Jim Laskey 2019-06-06 12:24:44 -03:00
parent 618afc3fa2
commit 0777a86d68
4 changed files with 185 additions and 148 deletions
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70
src/java.base/share/classes/java/lang/StringUTF16.java
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@ -1119,76 +1119,10 @@ final class StringUTF16 {
static LinesSpliterator spliterator(byte[] value) {
return new LinesSpliterator(value, 0, value.length >>> 1);
}
static LinesSpliterator spliterator(byte[] value, int leading, int trailing) {
int length = value.length >>> 1;
int left = 0;
int index;
for (int l = 0; l < leading; l++) {
index = skipBlankForward(value, left, length);
if (index == left) {
break;
}
left = index;
}
int right = length;
for (int t = 0; t < trailing; t++) {
index = skipBlankBackward(value, left, right);
if (index == right) {
break;
}
right = index;
}
return new LinesSpliterator(value, left, right - left);
}
private static int skipBlankForward(byte[] value, int start, int length) {
int index = start;
while (index < length) {
char ch = getChar(value, index++);
if (ch == '\n') {
return index;
}
if (ch == '\r') {
if (index < length && getChar(value, index) == '\n') {
return index + 1;
}
return index;
}
if (ch != ' ' && ch != '\t' && !Character.isWhitespace(ch)) {
return start;
}
}
return length;
}
private static int skipBlankBackward(byte[] value, int start, int fence) {
int index = fence;
if (start < index && getChar(value, index - 1) == '\n') {
index--;
}
if (start < index && getChar(value, index - 1) == '\r') {
index--;
}
while (start < index) {
char ch = getChar(value, --index);
if (ch == '\r' || ch == '\n') {
return index + 1;
}
if (ch != ' ' && ch != '\t' && !Character.isWhitespace(ch)) {
return fence;
}
}
return start;
}
}
static Stream<String> lines(byte[] value, int leading, int trailing) {
if (leading == 0 && trailing == 0) {
return StreamSupport.stream(LinesSpliterator.spliterator(value), false);
} else {
return StreamSupport.stream(LinesSpliterator.spliterator(value, leading, trailing), false);
}
static Stream<String> lines(byte[] value) {
return StreamSupport.stream(LinesSpliterator.spliterator(value), false);
}
private static void putChars(byte[] val, int index, char[] str, int off, int end) {