private function clearStandaloneLines(array &$nodes, array &$tokens)
    {
        if ($this->lineTokens > 1) {
            // this is the third or later node on this line, so it can't be standalone
            return;
        }

        $prev = null;
        if ($this->lineTokens === 1) {
            // this is the second node on this line, so it can't be standalone
            // unless the previous node is whitespace.
            if ($prev = end($nodes)) {
                if (!$this->tokenIsWhitespace($prev)) {
                    return;
                }
            }
        }

        if ($next = reset($tokens)) {
            // If we're on a new line, bail.
            if ($next[Mustache_Tokenizer::LINE] !== $this->lineNum) {
                return;
            }

            // If the next token isn't whitespace, bail.
            if (!$this->tokenIsWhitespace($next)) {
                return;
            }

            if (count($tokens) !== 1) {
                // Unless it's the last token in the template, the next token
                // must end in newline for this to be standalone.
                if (substr($next[Mustache_Tokenizer::VALUE], -1) !== "\n") {
                    return;
                }
            }

            // Discard the whitespace suffix
            array_shift($tokens);
        }

        if ($prev) {
            // Return the whitespace prefix, if any
            return array_pop($nodes);
        }
    }