Recently I stumbled on Julian Elve's Digital Garden 
in which he captures reflections by Mike Caulfield regarding stream and state modes, a theoretical framing of Caulfield's metaphoric Stream/Garden paradigm: …
A Parser has an Input stream, a set of rules (generated from an extended **PEG**) that recognise input Structure and generate output structures, an output stream to collect generated output, and a current result (semantic value from the most recent Expression) that can be read and written within rules.
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stream | BrE striːm, AmE strim | A noun 1 (of flowing water) Wasserlauf (Mask.) (brook) Bach (Mask.) 2 (flow, large quantity) Strom (Mask.) (of abuse, excuses, words) Schwall (Mask.) ▸ streams or a stream of applications eine Flut von Bewerbungen ▸ in streams in Strömen ▸ the children rushed in streams/in a stream through the school gates die Kinder strömten durch die Schultore 3 (current) Strömung (Fem.) (figurative) Trend (Mask.) ▸ against/with the stream of sth (figurative) gegen den/mit dem Strom einer Sache ▸ go against/with the stream ‹Person›: gegen den/mit dem Strom schwimmen see also Gulf Stream 4 (British) (School, University) Parallelzug (Mask.) 5 be/go on stream (Business) in Betrieb sein/den Betrieb aufnehmen B intransitive verb 1 (flow) strömen ‹Sonnenlicht›: fluten ▸ tears streamed down her face Tränen strömten ihr über das Gesicht 2 (run with liquid) my eyes streamed mir tränten die Augen ▸ the windows/walls were streaming with condensation die Fenster/Wände schwitzten ▸ his back was streaming with sweat sein Rücken war schweißnass or schweißüberströmt 3 (wave) ‹Haare, Fahne›: flattern, wehen C transitive verb 1 (emit) his nose was streaming blood Blut floss ihm aus der Nase 2 (British) (School, University) in leistungshomogene Gruppen einteilen PHRASAL VERBS stream down intransitive verb ‹Sonne›: vom Himmel strahlen ▸ the rain is streaming down es regnet in Strömen stream in intransitive verb (considered from inside) hereinströmen (considered from outside) hineinströmen stream out intransitive verb 1 (move out like stream) (considered from outside) herausströmen (considered from inside) hinausströmen 2 (float) flattern wehen stream past intransitive verb vorbeiströmen stream through intransitive verb hindurchströmen