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arxiv: 2504.17038 · v1 · pith:AZOBLHRM · submitted 2025-04-23 · cs.SE · cs.CL

SCALAR: A Part-of-speech Tagger for Identifiers

Christian D. Newman , Brandon Scholten , Sophia Testa , Joshua A. C. Behler , Syreen Banabilah , Michael L. Collard , Michael J. Decker , Mohamed Wiem Mkaouer
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Marcos Zampieri Eman Abdullah AlOmar Reem Alsuhaibani Anthony Peruma Jonathan I. Maletic
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classification cs.SE cs.CL
keywords namesscalartaggercodeidentifierspart-of-speechannotatinggrammar
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The paper presents the Source Code Analysis and Lexical Annotation Runtime (SCALAR), a tool specialized for mapping (annotating) source code identifier names to their corresponding part-of-speech tag sequence (grammar pattern). SCALAR's internal model is trained using scikit-learn's GradientBoostingClassifier in conjunction with a manually-curated oracle of identifier names and their grammar patterns. This specializes the tagger to recognize the unique structure of the natural language used by developers to create all types of identifiers (e.g., function names, variable names etc.). SCALAR's output is compared with a previous version of the tagger, as well as a modern off-the-shelf part-of-speech tagger to show how it improves upon other taggers' output for annotating identifiers. The code is available on Github

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