Result (char c, final int prefixLength, final Lookup lookup) { PsiFile file = lookup.getPsiFile(); if (file == null) return null; boolean isJava = file.getLanguage().isKindOf(JavaLanguage.INSTANCE); boolean isJsp = file.getFileType() == StdFileTypes.JSP; if (!isJava && !isJsp) { return null; } LookupElement item = lookup.getCurrentItem(); if (item == null || !item.isValid()) return null; final Object o = item.getObject(); if (c == '!' || c == '?') { JavaPsiClassReferenceElement typeItem = item.as(JavaPsiClassReferenceElement.class); if (typeItem != null && typeItem.getInsertHandler() instanceof JavaClassNameInsertHandler) { return Result.SELECT_ITEM_AND_FINISH_LOOKUP; } } if (c == '{' || c == '@') { PsiElement element = lookup.getPsiElement(); if (element instanceof PsiDocComment || element instanceof PsiDocToken || element instanceof PsiWhiteSpace && element.getParent() instanceof PsiDocComment) { return Result.ADD_TO_PREFIX; } } if (c == '!') { VariableLookupItem varItem = item.as(VariableLookupItem.class); if (varItem != null && varItem.isNegatable()) return Result.SELECT_ITEM_AND_FINISH_LOOKUP; JavaMethodCallElement methodItem = item.as(JavaMethodCallElement.class); if (methodItem != null && methodItem.isNegatable()) return Result.SELECT_ITEM_AND_FINISH_LOOKUP; if (o instanceof PsiKeyword && ((PsiKeyword)o).textMatches(PsiKeyword.INSTANCEOF)) { return Result.SELECT_ITEM_AND_FINISH_LOOKUP; } return null; } if (c == '.' && isWithinLiteral(lookup)) return Result.ADD_TO_PREFIX; if (c == ':') { PsiDocumentManager.getInstance(file.getProject()).commitDocument(lookup.getEditor().getDocument()); PsiElement leaf = file.findElementAt(lookup.getEditor().getCaretModel().getOffset() - 1); if (PsiUtil.getLanguageLevel(file).isAtLeast(LanguageLevel.JDK_1_8)) { PsiStatement statement = PsiTreeUtil.getParentOfType(leaf, PsiStatement.class); if (statement == null || statement.getTextRange().getStartOffset() != leaf.getTextRange().getStartOffset()) { // not typing a statement label return Result.SELECT_ITEM_AND_FINISH_LOOKUP; } } if (PsiTreeUtil.getParentOfType(leaf, PsiSwitchLabelStatement.class) != null || PsiTreeUtil.getParentOfType(leaf, PsiConditionalExpression.class) != null) { return Result.SELECT_ITEM_AND_FINISH_LOOKUP; } return Result.HIDE_LOOKUP; } if (c == '[' || c == ']' || c == ')' || c == '>') return CharFilter.Result.SELECT_ITEM_AND_FINISH_LOOKUP; if (c == '<' && o instanceof PsiClass) return Result.SELECT_ITEM_AND_FINISH_LOOKUP; if (c == '(') { if (o instanceof PsiClass) { if (PsiJavaPatterns.psiElement().afterLeaf(PsiKeyword.NEW).accepts(lookup.getPsiElement())) { return Result.SELECT_ITEM_AND_FINISH_LOOKUP; } return Result.HIDE_LOOKUP; } if (o instanceof PsiType) { return Result.HIDE_LOOKUP; } } if ((c == ',' || c == '=') && o instanceof PsiVariable) { int lookupStart = lookup.getLookupStart(); String name = ((PsiVariable)o).getName(); if (lookupStart >= 0 && name != null && name.equals(lookup.itemPattern(item))) { return Result.HIDE_LOOKUP; } } if (c == '#' && PsiTreeUtil.getParentOfType(lookup.getPsiElement(), PsiDocComment.class) != null) { if (o instanceof PsiClass) { return Result.SELECT_ITEM_AND_FINISH_LOOKUP; } } if (c == '(' && PsiKeyword.RETURN.equals(item.getLookupString())) { return Result.HIDE_LOOKUP; } return null; } }