@Nullable
public static <E extends PsiElement> E findArgumentList(
PsiFile file, int offset, int lbraceOffset) {
if (file == null) return null;
ParameterInfoHandler[] handlers =
ShowParameterInfoHandler.getHandlers(
file.getProject(),
PsiUtilCore.getLanguageAtOffset(file, offset),
file.getViewProvider().getBaseLanguage());
if (handlers != null) {
for (ParameterInfoHandler handler : handlers) {
if (handler instanceof ParameterInfoHandlerWithTabActionSupport) {
final ParameterInfoHandlerWithTabActionSupport parameterInfoHandler2 =
(ParameterInfoHandlerWithTabActionSupport) handler;
// please don't remove typecast in the following line; it's required to compile the code
// under old JDK 6 versions
final E e =
(E)
ParameterInfoUtils.findArgumentList(
file, offset, lbraceOffset, parameterInfoHandler2);
if (e != null) return e;
}
}
}
return null;
}
private int getPrevOrNextParameterOffset(boolean isNext) {
if (!(myHandler instanceof ParameterInfoHandlerWithTabActionSupport)) return -1;
ParameterInfoHandlerWithTabActionSupport handler =
(ParameterInfoHandlerWithTabActionSupport) myHandler;
boolean noDelimiter = handler.getActualParameterDelimiterType() == TokenType.WHITE_SPACE;
int caretOffset = myEditor.getCaretModel().getOffset();
int offset =
noDelimiter
? caretOffset
: CharArrayUtil.shiftBackward(
myEditor.getDocument().getCharsSequence(), caretOffset - 1, " \t")
+ 1;
int lbraceOffset = myLbraceMarker.getStartOffset();
PsiFile file = PsiDocumentManager.getInstance(myProject).getPsiFile(myEditor.getDocument());
PsiElement argList =
lbraceOffset < offset ? findArgumentList(file, offset, lbraceOffset) : null;
if (argList == null) return -1;
@SuppressWarnings("unchecked")
PsiElement[] parameters = handler.getActualParameters(argList);
int currentParameterIndex =
noDelimiter
? JBIterable.of(parameters).indexOf((o) -> o.getTextRange().containsOffset(offset))
: ParameterInfoUtils.getCurrentParameterIndex(
argList.getNode(), offset, handler.getActualParameterDelimiterType());
int prevOrNextParameterIndex =
isNext && currentParameterIndex < parameters.length - 1
? currentParameterIndex + 1
: !isNext && currentParameterIndex > 0 ? currentParameterIndex - 1 : -1;
return prevOrNextParameterIndex != -1
? parameters[prevOrNextParameterIndex].getTextRange().getStartOffset()
: -1;
}