module

from.abnf

local Grammar = require "ion7.grammar"
local g = Grammar.from_abnf([[
    date = year "-" month "-" day
    year = 4DIGIT
    month = 2DIGIT
    day = 2DIGIT
]])
print(g:to_gbnf())

Functions

apply_rep from_abnf

apply_rep

A repetition prefix produces a `{ min, max }` pair consumed by apply_rep. `min == max == nil` means "exactly one" — no rep wrapper needed.

apply_rep(rep, node)

from_abnf

Parse an ABNF string into a Builder. Only the core rules actually referenced by the user grammar are emitted; unreferenced ones stay out of the compiled GBNF. User rules with the same name as a core rule shadow the core entry.

from_abnf(source, root)

sourcestringABNF rulelist (RFC 5234 §4 syntax).

rootstring?Root rule name (default: first defined rule).

→ Builder