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Mining source code to automatically split identifiers for software analysis

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4 Author(s)
Enslen, E. ; Dept. of Comput. & Inf. Sci., Univ. of Delaware, Newark, DE ; Hill, E. ; Pollock, L. ; Vijay-Shanker, K.

Automated software engineering tools (e.g., program search, concern location, code reuse, quality assessment, etc.) increasingly rely on natural language information from comments and identifiers in code. The first step in analyzing words from identifiers requires splitting identifiers into their constituent words. Unlike natural languages, where space and punctuation are used to delineate words, identifiers cannot contain spaces. One common way to split identifiers is to follow programming language naming conventions. For example, Java programmers often use camel case, where words are delineated by uppercase letters or non-alphabetic characters. However, programmers also create identifiers by concatenating sequences of words together with no discernible delineation, which poses challenges to automatic identifier splitting. In this paper, we present an algorithm to automatically split identifiers into sequences of words by mining word frequencies in source code. With these word frequencies, our identifier splitter uses a scoring technique to automatically select the most appropriate partitioning for an identifier. In an evaluation of over 8000 identifiers from open source Java programs, our Samurai approach outperforms the existing state of the art techniques.

Published in:

Mining Software Repositories, 2009. MSR '09. 6th IEEE International Working Conference on

Date of Conference:

16-17 May 2009

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