@Override
protected final Optional<Expression> visitConditionalOpNode(ConditionalOpNode node) {
if (allowsDetaches()) {
Optional<Expression> trueBranch = visit(node.getChild(1));
Optional<Expression> falseBranch = visit(node.getChild(2));
// We only compile as an SVP if both branches are able to be compiled as such. Technically,
// we could also support cases where only one branch is compilable to an SVP, but i doubt
// that would be that important.
if (!trueBranch.isPresent() || !falseBranch.isPresent()) {
return Optional.absent();
}
Expression condition =
detachingExprCompiler.compile(node.getChild(0)).convert(boolean.class);
return Optional.of(BytecodeUtils.ternary(condition, trueBranch.get(), falseBranch.get()));
}
return visitExprNode(node);
}
@Override
protected Optional<Expression> visitNullCoalescingOpNode(NullCoalescingOpNode node) {
// All non-trivial ?: will require detaches for the left hand side.
if (allowsDetaches()) {
// for '$foo ?: $bar' we always have to eagerly evaluate $foo but $bar could be lazy.
// of course if $foo is not null, then we will need to box it, however the current support
// for ?: in ExpressionCompiler also always boxes everything so we aren't really losing
// anything here.
Optional<Expression> right = visit(node.getRightChild());
if (!right.isPresent()) {
return Optional.absent();
}
Expression left =
detachingExprCompiler.compile(node.getLeftChild()).box().cast(SoyValueProvider.class);
return Optional.of(BytecodeUtils.firstNonNull(left, right.get()));
}
return visitExprNode(node);
}
