// static
void
TextEditRules::HandleNewLines(nsString& aString,
int32_t aNewlineHandling)
{
if (aNewlineHandling < 0) {
int32_t caretStyle;
TextEditor::GetDefaultEditorPrefs(aNewlineHandling, caretStyle);
}
switch(aNewlineHandling) {
case nsIPlaintextEditor::eNewlinesReplaceWithSpaces:
// Strip trailing newlines first so we don't wind up with trailing spaces
aString.Trim(CRLF, false, true);
aString.ReplaceChar(CRLF, ' ');
break;
case nsIPlaintextEditor::eNewlinesStrip:
aString.StripCRLF();
break;
case nsIPlaintextEditor::eNewlinesPasteToFirst:
default: {
int32_t firstCRLF = aString.FindCharInSet(CRLF);
// we get first *non-empty* line.
int32_t offset = 0;
while (firstCRLF == offset) {
offset++;
firstCRLF = aString.FindCharInSet(CRLF, offset);
}
if (firstCRLF > 0) {
aString.Truncate(firstCRLF);
}
if (offset > 0) {
aString.Cut(0, offset);
}
break;
}
case nsIPlaintextEditor::eNewlinesReplaceWithCommas:
aString.Trim(CRLF, true, true);
aString.ReplaceChar(CRLF, ',');
break;
case nsIPlaintextEditor::eNewlinesStripSurroundingWhitespace: {
nsAutoString result;
uint32_t offset = 0;
while (offset < aString.Length()) {
int32_t nextCRLF = aString.FindCharInSet(CRLF, offset);
if (nextCRLF < 0) {
result.Append(nsDependentSubstring(aString, offset));
break;
}
uint32_t wsBegin = nextCRLF;
// look backwards for the first non-whitespace char
while (wsBegin > offset && NS_IS_SPACE(aString[wsBegin - 1])) {
--wsBegin;
}
result.Append(nsDependentSubstring(aString, offset, wsBegin - offset));
offset = nextCRLF + 1;
while (offset < aString.Length() && NS_IS_SPACE(aString[offset])) {
++offset;
}
}
aString = result;
break;
}
case nsIPlaintextEditor::eNewlinesPasteIntact:
// even if we're pasting newlines, don't paste leading/trailing ones
aString.Trim(CRLF, true, true);
break;
}
}
