@Nullable
public static JetElement getOutermostLastBlockElement(
@Nullable JetElement element, @NotNull Predicate<JetElement> checkElement) {
if (element == null) return null;
if (!(element instanceof JetBlockExpression))
return checkElement.apply(element) ? element : null;
JetBlockExpression block = (JetBlockExpression) element;
int n = block.getStatements().size();
if (n == 0) return null;
JetElement lastElement = block.getStatements().get(n - 1);
return checkElement.apply(lastElement) ? lastElement : null;
}
public static boolean checkVariableDeclarationInBlock(
@NotNull JetBlockExpression block, @NotNull String varName) {
for (JetElement element : block.getStatements()) {
if (element instanceof JetVariableDeclaration) {
if (((JetVariableDeclaration) element).getNameAsSafeName().asString().equals(varName)) {
return true;
}
}
}
return false;
}
public static boolean isImplicitlyUsed(@NotNull JetElement element) {
PsiElement parent = element.getParent();
if (!(parent instanceof JetBlockExpression)) return true;
JetBlockExpression block = (JetBlockExpression) parent;
List<JetElement> statements = block.getStatements();
if (statements.get(statements.size() - 1) == element) {
JetExpression expression = getDirectParentOfTypeForBlock(block, JetIfExpression.class);
if (expression == null) {
expression = getDirectParentOfTypeForBlock(block, JetWhenExpression.class);
}
if (expression == null) {
expression = getDirectParentOfTypeForBlock(block, JetFunctionLiteral.class);
}
if (expression == null) {
expression = getDirectParentOfTypeForBlock(block, JetTryExpression.class);
}
if (expression != null) {
return isImplicitlyUsed(expression);
}
}
return false;
}
@Nullable
public static JetElement getLastStatementInABlock(@Nullable JetBlockExpression blockExpression) {
if (blockExpression == null) return null;
List<JetElement> statements = blockExpression.getStatements();
return statements.isEmpty() ? null : statements.get(statements.size() - 1);
}