phpflo / phpflo-fbp

            //define states

            switch (true) {

                case !empty($step[self::DATA_LABEL]) && ($hasInport && $hasOutport):

                    // initializer + inport

                    $nextSrc = $resolved;

                    $step[self::TARGET_LABEL] = $this->addPort($resolved, self::INPORT_LABEL);

                    // multi def oneliner initializer resolved

                    array_push($this->definition[self::INITIALIZERS_LABEL], $step);

                    $step = [];

                    break;

                case !empty($nextSrc) && ($hasInport && $hasOutport):

                    // if there was an initializer, we get a full touple with this iteration

                    $step = [

                    array_push($subset, $step);

                    $step = [];

                    break;

                case $hasInport && $hasOutport:

                    // tgt + multi def

                    $nextSrc = $resolved;

                    $step[self::TARGET_LABEL] = $this->addPort($resolved, self::INPORT_LABEL);

                    // check if we've already got the touple ready

                    if (!empty($step[self::SOURCE_LABEL])) {

                        array_push($subset, $step);

                        $step = [];

                    }

                    break;

                case $hasInport && $nextSrc:

                    // use previous OUT as src to fill touple

                    $step[self::SOURCE_LABEL] = $this->addPort($nextSrc, self::OUTPORT_LABEL);