public TextRange surroundExpression(
final Project project, final Editor editor, PsiExpression expr)
throws IncorrectOperationException {
assert expr.isValid();
PsiType[] types = GuessManager.getInstance(project).guessTypeToCast(expr);
final boolean parenthesesNeeded =
expr instanceof PsiPolyadicExpression
|| expr instanceof PsiConditionalExpression
|| expr instanceof PsiAssignmentExpression;
String exprText = parenthesesNeeded ? "(" + expr.getText() + ")" : expr.getText();
final Template template = generateTemplate(project, exprText, types);
TextRange range;
if (expr.isPhysical()) {
range = expr.getTextRange();
} else {
final RangeMarker rangeMarker = expr.getUserData(ElementToWorkOn.TEXT_RANGE);
if (rangeMarker == null) return null;
range = new TextRange(rangeMarker.getStartOffset(), rangeMarker.getEndOffset());
}
editor.getDocument().deleteString(range.getStartOffset(), range.getEndOffset());
editor.getCaretModel().moveToOffset(range.getStartOffset());
editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
TemplateManager.getInstance(project).startTemplate(editor, template);
return null;
}
private static Template generateTemplate(
Project project, String exprText, final PsiType[] suggestedTypes) {
final TemplateManager templateManager = TemplateManager.getInstance(project);
final Template template = templateManager.createTemplate("", "");
template.setToReformat(true);
Set<LookupElement> itemSet = new LinkedHashSet<>();
for (PsiType type : suggestedTypes) {
itemSet.add(PsiTypeLookupItem.createLookupItem(type, null));
}
final LookupElement[] lookupItems = itemSet.toArray(new LookupElement[itemSet.size()]);
final Result result =
suggestedTypes.length > 0 ? new PsiTypeResult(suggestedTypes[0], project) : null;
Expression expr =
new Expression() {
@Override
public LookupElement[] calculateLookupItems(ExpressionContext context) {
return lookupItems.length > 1 ? lookupItems : null;
}
@Override
public Result calculateResult(ExpressionContext context) {
return result;
}
@Override
public Result calculateQuickResult(ExpressionContext context) {
return null;
}
};
template.addTextSegment("((");
template.addVariable(TYPE_TEMPLATE_VARIABLE, expr, expr, true);
template.addTextSegment(")" + exprText + ")");
template.addEndVariable();
return template;
}