@NotNull
private static Pair<CharSequence, String> convertLineSeparators(@NotNull CharBuffer buffer) {
int dst = 0;
char prev = ' ';
int crCount = 0;
int lfCount = 0;
int crlfCount = 0;
final int length = buffer.length();
final char[] bufferArray = CharArrayUtil.fromSequenceWithoutCopying(buffer);
for (int src = 0; src < length; src++) {
char c = bufferArray != null ? bufferArray[src] : buffer.charAt(src);
switch (c) {
case '\r':
if (bufferArray != null) bufferArray[dst++] = '\n';
else buffer.put(dst++, '\n');
crCount++;
break;
case '\n':
if (prev == '\r') {
crCount--;
crlfCount++;
} else {
if (bufferArray != null) bufferArray[dst++] = '\n';
else buffer.put(dst++, '\n');
lfCount++;
}
break;
default:
if (bufferArray != null) bufferArray[dst++] = c;
else buffer.put(dst++, c);
break;
}
prev = c;
}
String detectedLineSeparator = null;
if (crlfCount > crCount && crlfCount > lfCount) {
detectedLineSeparator = "\r\n";
} else if (crCount > lfCount) {
detectedLineSeparator = "\r";
} else if (lfCount > 0) {
detectedLineSeparator = "\n";
}
CharSequence result;
if (buffer.length() == dst) {
result = buffer;
} else {
// in Mac JDK CharBuffer.subSequence() signature differs from Oracle's
// more than that, the signature has changed between jd6 and jdk7,
// so use more generic CharSequence.subSequence() just in case
@SuppressWarnings("UnnecessaryLocalVariable")
CharSequence seq = buffer;
result = seq.subSequence(0, dst);
}
return Pair.create(result, detectedLineSeparator);
}
public void reset(CharSequence buffer, int start, int end, int initialState) {
zzBuffer = buffer;
zzBufferArray = com.intellij.util.text.CharArrayUtil.fromSequenceWithoutCopying(buffer);
zzCurrentPos = zzMarkedPos = zzStartRead = start;
zzPushbackPos = 0;
zzAtEOF = false;
zzAtBOL = true;
zzEndRead = end;
yybegin(initialState);
}
@Override
public boolean textContains(char c) {
final CharSequence text = myText;
final int len = myText.length();
if (len > TEXT_MATCHES_THRESHOLD) {
char[] chars = CharArrayUtil.fromSequenceWithoutCopying(myText);
if (chars != null) {
for (char aChar : chars) {
if (aChar == c) return true;
}
return false;
}
}
for (int i = 0; i < len; ++i) {
if (c == text.charAt(i)) return true;
}
return false;
}