Using Parser Expression Grammars (PEGs) in Janet Programming Language
By
Bogdanp
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Summary
This article provides a comprehensive tutorial on using Parser Expression Grammars (PEGs) in the Janet programming language. It explains that Janet, a Lisp-like language, uses PEGs instead of regular expressions for string parsing. The guide covers how PEGs are defined using associative data structures with named rules, demonstrates basic PEG syntax and matching, and shows how to build more complex parsers with recursive rules and custom functions. The article includes practical examples of parsing different data formats and discusses advanced PEG features like lookahead and error handling.
Key quotes
· 3 pulledJanet is a small, Lisp-like language. Unlike most programming languages, it offers no support for regular expressions. Instead, Janet supports parser expression grammars, or PEGs.
A PEG in Janet is usually described by an associative data structure that lists a series of rules. For each rule, the key is the name of the rule and the value is a description of the string that the rule will match.
What makes PEGs especially powerful is the ability for rules to refer to other rules (including recursive references) and for rules to run arbitrary functions.
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