PEG Module

(peg/compile peg)

Compiles a peg source data structure into a <core/peg>. This will speed up matching if the same peg will be used multiple times. Will also use (dyn :peg-grammar) to supplement the grammar of the peg for otherwise undefined peg keywords.

(peg/find peg text &opt start & args)

Find first index where the peg matches in text. Returns an integer, or nil if not found.

(peg/find-all peg text &opt start & args)

Find all indexes where the peg matches in text. Returns an array of integers.

(peg/match peg text &opt start & args)

Match a Parsing Expression Grammar to a byte string and return an array of captured values. Returns nil if text does not match the language defined by peg. The syntax of PEGs is documented on the Janet website.

(peg/replace peg subst text &opt start & args)

Replace first match of peg in text with subst, returning a new buffer. The peg does not need to make captures to do replacement. If subst is a function, it will be called with the matching text followed by any captures. If no matches are found, returns the input string in a new buffer.

(peg/replace-all peg subst text &opt start & args)

Replace all matches of peg in text with subst, returning a new buffer. The peg does not need to make captures to do replacement. If subst is a function, it will be called with the matching text followed by any captures.