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Abstract. Method names in Java are natural language phrases describing behaviour, encoded to make them easy for machines to parse. Programmers rely on the meaning encoded in method names to understand code. We know little about the language used in this encoding, its rules and structure, leaving the programmer without guidance in expressing her intent. Yet the meaning of the method names -or phrases -is readily available in the body of the methods they name. By correlating names and implementations, we can figure out the meaning of the original phrases, and uncover the rules of the phrase language as well. In this paper, we present an automatically generated proof-of-concept phrase book for Java, based on a large software corpus. The phrase book captures both the grammatical structure and the meaning of method phrases as commonly used by Java programmers.

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The Lancelot plugin extends the integrated development environment Eclipse with support for finding and fixing 'naming bugs' in Java programs. A naming bug is a mismatch between the name and implementation of a method, in the sense that the pairing of name and implementation do not correspond to the implicit method naming conventions used by many well-known open source applications.Lancelot has not been presented before, but its theoretical foundations and evaluation have been published [4]. The contribution of the present paper is to present a publicly available tool building on our theory, explain the design of the tool, including some necessary adaptations to the interactive use setting, and report on our experience with it. The source code of Lancelot is available under an open source license.

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