Abstract
Dynamic web pages composed of inter-woven (tangled) source code written in multiple programming languages (e.g., HTML, PHP, JavaScript, CSS) makes it difficult to analyze and manage clones in web applications. Despite more than a decade of research on software clones, there are not many studies towards the investigation of code clones in web applications. In this paper, we present an in-depth study on the patterns (i.e., forking and templating) of exact and near-miss code clones in two industrial dynamic web applications having distinct architecture. The findings of our study confirm the believed patterns for cloning and suggest that specialized techniques and tool support are necessary for effectively managing clones in the tangled source code of dynamic web applications.
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