How do I parse Gram notation into a pattern?

Parsing converts a Gram notation string into a list of Pattern<Subject> values. Each top-level element in the Gram string becomes one pattern.

Rust

use gram_codec::parse_gram;

let input = "(alice:Person)-[:KNOWS]->(bob:Person)";
let patterns = parse_gram(input)?;

println!("parsed {} patterns", patterns.len());

Python

from relateby import gram

patterns = gram.parse("(alice:Person)-[:KNOWS]->(bob:Person)")

print(f"parsed {len(patterns)} patterns")

TypeScript

import { Gram } from "@relateby/gram"
import { Effect } from "effect"

const patterns = await Effect.runPromise(
  Gram.parse("(alice:Person)-[:KNOWS]->(bob:Person)")
)

console.log(`parsed ${patterns.length} patterns`)

See also: What is Gram notation?