public static List<PsiLambdaExpression> collectLambdas(
@NotNull SourcePosition position, final boolean onlyOnTheLine) {
ApplicationManager.getApplication().assertReadAccessAllowed();
PsiFile file = position.getFile();
final int line = position.getLine();
final Document document = PsiDocumentManager.getInstance(file.getProject()).getDocument(file);
if (document == null || line >= document.getLineCount()) {
return Collections.emptyList();
}
PsiElement element = position.getElementAt();
final TextRange lineRange = DocumentUtil.getLineTextRange(document, line);
do {
PsiElement parent = element.getParent();
if (parent == null || (parent.getTextOffset() < lineRange.getStartOffset())) {
break;
}
element = parent;
} while (true);
final List<PsiLambdaExpression> lambdas = new ArrayList<PsiLambdaExpression>(3);
final PsiElementVisitor lambdaCollector =
new JavaRecursiveElementVisitor() {
@Override
public void visitLambdaExpression(PsiLambdaExpression expression) {
super.visitLambdaExpression(expression);
if (!onlyOnTheLine || getFirstElementOnTheLine(expression, document, line) != null) {
lambdas.add(expression);
}
}
};
element.accept(lambdaCollector);
// add initial lambda if we're inside already
PsiElement method = getContainingMethod(element);
if (method instanceof PsiLambdaExpression) {
lambdas.add((PsiLambdaExpression) method);
}
for (PsiElement sibling = getNextElement(element);
sibling != null;
sibling = getNextElement(sibling)) {
if (!intersects(lineRange, sibling)) {
break;
}
sibling.accept(lambdaCollector);
}
return lambdas;
}
@Nullable
public static PsiElement getFirstElementOnTheLine(
PsiLambdaExpression lambda, Document document, int line) {
ApplicationManager.getApplication().assertReadAccessAllowed();
TextRange lineRange = DocumentUtil.getLineTextRange(document, line);
if (!intersects(lineRange, lambda)) return null;
PsiElement body = lambda.getBody();
if (body == null || !intersects(lineRange, body)) return null;
if (body instanceof PsiCodeBlock) {
for (PsiStatement statement : ((PsiCodeBlock) body).getStatements()) {
if (intersects(lineRange, statement)) {
return statement;
}
}
return null;
}
return body;
}