Patchwork\CodeManipulation\Source::collectLevelInfo PHP Method

    function collectLevelInfo()
    {
        $level = 0;
        $this->levels = [];
        $this->tokensByLevel = [];
        $this->levelBeginnings = [];
        $this->levelEndings = [];
        $this->tokensByLevelAndType = [];
        foreach ($this->tokens as $offset => $token) {
            $type = $token[self::TYPE_OFFSET];
            switch ($type) {
                case '(':
                case '[':
                case '{':
                case T_CURLY_OPEN:
                case T_DOLLAR_OPEN_CURLY_BRACES:
                    $level++;
                    Utils\appendUnder($this->levelBeginnings, $level, $offset);
                    break;
                case ')':
                case ']':
                case '}':
                    Utils\appendUnder($this->levelEndings, $level, $offset);
                    $level--;
            }
            $this->levels[$offset] = $level;
            Utils\appendUnder($this->tokensByLevel, $level, $offset);
            Utils\appendUnder($this->tokensByLevelAndType, [$level, $type], $offset);
        }
        Utils\appendUnder($this->levelBeginnings, 0, -1);
        Utils\appendUnder($this->levelEndings, 0, count($this->tokens));
    }