GIGA: Graphical Definition of Production Rules in a Spatial Parser Generator

We previously developed the spatial parser generator Eviss, which automatically generates a spatial parser by defining the grammar of the visual language. In Eviss, we introduced “action” into CMGs in order to express the behavior of visual programming systems. However, in Eviss, the input of the grammar is performed using the text. If we can use a figure for inputting the grammar and edit it directly, the grammar will become easier to understand. Therefore, we have developed the GIGA system to supplant Eviss, the graphical interface for the CMG Input Window has two additional screens, i.e. a pre-action screen and a post-action screen. GIGA outputs the production rule by comparing the two screens. Using GIGA the user can define the grammar easily and can understand the grammar visually.