Publication Type

Journal Article

Version

acceptedVersion

Publication Date

10-2018

Abstract

Source code terms such as method names and variable types are often different from conceptual words mentioned in a search query. This vocabulary mismatch problem can make code search inefficient. In this paper, we present COde voCABUlary (CoCaBu), an approach to resolving the vocabulary mismatch problem when dealing with free-form code search queries. Our approach leverages common developer questions and the associated expert answers to augment user queries with the relevant, but missing, structural code entities in order to improve the performance of matching relevant code examples within large code repositories. To instantiate this approach, we build GitSearch, a code search engine, on top of GitHub and Stack Overflow Q&A data. We evaluate GitSearch in several dimensions to demonstrate that (1) its code search results are correct with respect to user-accepted answers; (2) the results are qualitatively better than those of existing Internet-scale code search engines; (3) our engine is competitive against web search engines, such as Google, in helping users solve programming tasks; and (4) GitSearch provides code examples that are acceptable or interesting to the community as answers for Stack Overflow questions.

Keywords

Code search, GitHub, Free-form search, Query augmentation, StackOverflow, Vocabulary mismatch

Discipline

Computer Engineering | Programming Languages and Compilers | Software Engineering

Research Areas

Data Science and Engineering

Publication

Empirical Software Engineering

Volume

23

Issue

5

First Page

2622

Last Page

2654

ISSN

1382-3256

Identifier

10.1007/s10664-017-9544-y

Publisher

Springer Verlag (Germany)

Copyright Owner and License

Authors

Additional URL

https://doi.org/10.1007/s10664-017-9544-y

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