Pereira, Filipe M. GarciaFonseca, Manuel J.Jorge, Joaquim A.Chambel, Teresa and Nunes, Nuno and Romao, Teresa and Creissac Campos, José2021-11-032021-11-032021978-3-03868-167-0https://doi.org/10.2312/pt.20061540https://diglib.eg.org:443/handle/10.2312/pt20061540This paper presents a project which expands on JavaSketchit [8], which parsed sketches of user interfaces, iden- tifying gestures by using CALI [6], and then used topological relations and relational constraints [4] to recog- nize pairs of gestures as widgets in a Java graphical user interface. JavaSketchit was able to export the func- tional source code for the prototype in Java. Our approach allows users to write down their own visual lan- guage and removes the existing limitation of one pair of gestures per widget. The resulting parser became ap- plicable in different contexts besides designing user interfaces. The result is a functional implementation of a parser designed to handle Relational Adjacency Grammars customized by the user..Calligraphic InterfaceVisual ParserVisual Syntax ParsingVisual GrammarRelational Adjacency GrammarWidgetsGesturesSketches10.2312/pt.20061540119-122