Abstract
• Deterministic LR parsing. • Generalized GLR parsing. • Integrated scanning. • Declarative disambiguation. • GLR trace visualization. Parglare is a Python parsing library that implements deterministic LR and its generalized extension GLR algorithms. Parglare strives to be easy to use by providing rich error messages, visualization, a CLI tool for grammar development, and good documentation. The same grammar format is used for both algorithms. It is easy to choose either LR parsing if performance is more important or GLR in case a grammar cannot fit into the constraints of deterministic LR parsing and a more powerful parsing is needed. Parglare has been used in data extraction from various textual formats, analysis of legacy source code, and developing and teaching DSL development. The GitHub repository of the project contains multiple examples and a comprehensive functionality and performance test suite.
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