Implementing a Simple PEG Engine in Janet: 10 Lines to Parsing Power
2025-04-14
This post delves into the implementation of a Parsing Expression Grammar (PEG) engine in the Janet programming language. Starting with fundamental PEG concepts, the author demonstrates how to build a powerful PEG parser with surprisingly concise code. The core `match-peg` function is explained in detail, showing how to extend its capabilities through operator additions and recursion, culminating in an ISO 8601 date parser. While not without limitations, this implementation effectively illustrates the core principles and implementation of PEGs, providing valuable insights for those learning about PEGs and compiler design.
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