# `Ichor.PEG.Actions`
[🔗](https://github.com/joetjen/ichor/blob/v0.3.0/lib/ichor/peg/actions.ex#L1)

Turns a parsed PEG `grammar_file` (Ford's paper, pest/PEG.js-style
convention) into a real `%{ident_atom => Grammar.IR.expr()}` map --
one `Grammar.IR` tree per rule, the same target category every other
importer this project builds uses.

PEG's own operators (`&`, `!`, `?`, `*`, `+`, `/`, `.`, `[...]`) are
close to identical in spelling and meaning to Aether's own, so most of
this module is a thin wrapper. `primary`'s `(IDENT !ARROW)` is real
disambiguation, not a formality: without the negative lookahead, a
bare identifier reference inside one rule's expression would be
ambiguous with the start of the next rule's own definition. It works
because `!ARROW` is a parser-level predicate checked at every
candidate identifier, unlike the lexer-level maximal munch that
causes the equivalent ambiguity in `Ichor.BNF`/`Ichor.EBNF.W3C` (both
need an explicit newline between rules for exactly this reason; PEG
doesn't).

Rule names are kept exactly as written, case-sensitively, matching
ordinary identifier conventions (no RFC 5234-style case-insensitivity
rule applies here).

`[^...]` negates a character class the same way regex's own does:
`Seq([NotPred(class), Any])`.

---

*Consult [api-reference.md](api-reference.md) for complete listing*