in sources/java-incremental-compilation/jvm-inc-builder/src/com/intellij/tools/build/bazel/org/jdom/output/Format.java [203:236]
public static String compact(String str) {
int right = str.length() - 1;
int left = 0;
while (left <= right &&
Verifier.isXMLWhitespace(str.charAt(left))) {
left++;
}
while (right > left &&
Verifier.isXMLWhitespace(str.charAt(right))) {
right--;
}
if (left > right) {
return "";
}
boolean space = true;
final StringBuilder buffer = new StringBuilder(right - left + 1);
while (left <= right) {
final char c = str.charAt(left);
if (Verifier.isXMLWhitespace(c)) {
if (space) {
buffer.append(' ');
space = false;
}
}
else {
buffer.append(c);
space = true;
}
left++;
}
return buffer.toString();
}