private static boolean isBrace(@NotNull PsiElement candidate) {
final ASTNode node = candidate.getNode();
if (node != null && node.getFirstChildNode() == null) {
final PairedBraceMatcher braceMatcher =
LanguageBraceMatching.INSTANCE.forLanguage(candidate.getLanguage());
if (braceMatcher != null) {
final IElementType elementType = node.getElementType();
for (BracePair pair : braceMatcher.getPairs()) {
if (elementType == pair.getLeftBraceType() || elementType == pair.getRightBraceType()) {
return true;
}
}
}
}
return false;
}
@Override
public Result preprocessEnter(
@NotNull final PsiFile file,
@NotNull final Editor editor,
@NotNull final Ref<Integer> caretOffsetRef,
@NotNull final Ref<Integer> caretAdvance,
@NotNull final DataContext dataContext,
final EditorActionHandler originalHandler) {
int caretOffset = caretOffsetRef.get().intValue();
PsiElement psiAtOffset = file.findElementAt(caretOffset);
if (psiAtOffset != null && psiAtOffset.getTextOffset() < caretOffset) {
ASTNode token = psiAtOffset.getNode();
Document document = editor.getDocument();
CharSequence text = document.getText();
final Language language = psiAtOffset.getLanguage();
final Commenter languageCommenter = LanguageCommenters.INSTANCE.forLanguage(language);
final CodeDocumentationAwareCommenter commenter =
languageCommenter instanceof CodeDocumentationAwareCommenter
? (CodeDocumentationAwareCommenter) languageCommenter
: null;
if (commenter != null && token.getElementType() == commenter.getLineCommentTokenType()) {
final int offset = CharArrayUtil.shiftForward(text, caretOffset, " \t");
if (offset < document.getTextLength() && text.charAt(offset) != '\n') {
String prefix = commenter.getLineCommentPrefix();
assert prefix != null : "Line Comment type is set but Line Comment Prefix is null!";
if (!StringUtil.startsWith(text, offset, prefix)) {
if (text.charAt(caretOffset) != ' ' && !prefix.endsWith(" ")) {
prefix += " ";
}
document.insertString(caretOffset, prefix);
return Result.Default;
} else {
int afterPrefix = offset + prefix.length();
if (afterPrefix < document.getTextLength() && text.charAt(afterPrefix) != ' ') {
document.insertString(afterPrefix, " ");
// caretAdvance.set(0);
}
caretOffsetRef.set(offset);
}
return Result.Default;
}
}
}
return Result.Continue;
}