Intentionally Fusing Direct Manipulations into SVG Programs

Abstract

Bidirectional live programming is a programming paradigm that enhances the developer experience by allowing direct modifications to the output, with changes instantly reflected back to the source program. Existing operation-based approaches allow modifying the constant values and expressions of programs, while they lack control over modifications originating from multiple updatable locations. To control the updatability of the source program, our approach introduces non-updatable expressions, which guide the fusion of updates to the intended locations. The correctness properties, GetPut and WeakPutGet, ensure output consistency. We have implemented a prototype, FuseSVG, and tested it with 14 nontrivial SVG-drawing benchmarks, demonstrating the effectiveness of our approach.