Enum ungrammar::Rule

pub enum Rule {
    Labeled {
        label: String,
        rule: Box<Rule>,
    },
    Node(Node),
    Token(Token),
    Seq(Vec<Rule>),
    Alt(Vec<Rule>),
    Opt(Box<Rule>),
    Rep(Box<Rule>),
}

A production rule.

Variants

Labeled

A labeled rule, like a:B ("a" is the label, B is the rule).

Fields of Labeled

label: String

The label.

rule: Box<Rule>

The rule.

Node(Node)

A node, like A.

Token(Token)

A token, like 'struct'.

Seq(Vec<Rule>)

A sequence of rules, like 'while' '(' Expr ')' Stmt.

Alt(Vec<Rule>)

An alternative between many rules, like '+' | '-' | '*' | '/'.

Opt(Box<Rule>)

An optional rule, like A?.

Rep(Box<Rule>)

A repeated rule, like A*.

Trait Implementations

impl Debug for Rule

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Rule

impl PartialEq<Rule> for Rule

fn eq(&self, other: &Rule) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rule) -> bool

This method tests for !=.

impl StructuralEq for Rule

impl StructuralPartialEq for Rule