Function parse 

pub fn parse(
    g: &Grammar,
    root_rule_name: &str,
    tokens: &[Token],
    guards: Rc<HashMap<String, Guard, FxBuildHasher>>,
    hooks: Rc<HashMap<String, Hook, FxBuildHasher>>,
) -> Result<ASTNode, String>

Parse the given token stream (produced by bnf::tokenize) into an AST, using the given bnf::Grammar, and taking the given root rule name as the starting point.

Guards and hooks are for advanced usage (e.g. parsing C).

See also: ASTNode