A Pretty Expressive Printer - An Optimal and Flexible Approach to Document Layout

Explore a groundbreaking presentation from OOPSLA2 2023 on Πe, a novel pretty printer that revolutionizes code formatting. Delve into the innovative approach that balances expressiveness, optimality, and performance in pretty printing algorithms. Learn how Πe surpasses existing pretty printers in expressiveness while minimizing layout costs through user-defined objectives. Discover the formal verification process using the Lean theorem prover and the practical implementation as PrettyExpressive. Examine the comprehensive evaluation framework developed to compare pretty printers, showcasing Πe's efficiency and effectiveness in producing optimal layouts. Gain insights into the real-world adoption of PrettyExpressive as the foundation for a Racket code formatter. Access supplementary materials, including reusable artifacts, to further understand this significant advancement in pretty printing technology.

[OOPSLA23] A Pretty Expressive Printer