Enum Rule 

pub enum Rule {
    Blank,
    String(String),
    Pattern {
        value: String,
        flags: Option<String>,
    },
    Symbol(String),
    Seq(Vec<Rule>),
    Choice(Vec<Rule>),
    Repeat(Box<Rule>),
    Repeat1(Box<Rule>),
    Field {
        name: String,
        content: Box<Rule>,
    },
    Alias {
        content: Box<Rule>,
        value: String,
        named: bool,
    },
    Token(Box<Rule>),
    ImmediateToken(Box<Rule>),
    Prec {
        value: Precedence,
        content: Box<Rule>,
    },
    PrecLeft {
        value: Precedence,
        content: Box<Rule>,
    },
    PrecRight {
        value: Precedence,
        content: Box<Rule>,
    },
    PrecDynamic {
        value: i32,
        content: Box<Rule>,
    },
    Reserved {
        context_name: String,
        content: Box<Rule>,
    },
}

Grammar rule variants.

Variants

Blank

Epsilon (empty match).

String(String)

Literal token.

Pattern

Regex token.

Fields

value: String

flags: Option<String>

Symbol(String)

Reference to another rule.

Seq(Vec<Rule>)

Sequence of rules (must match in order).

Choice(Vec<Rule>)

Alternation (first matching wins).

Repeat(Box<Rule>)

Zero or more repetitions.

Repeat1(Box<Rule>)

One or more repetitions.

Field

Named field.

Fields

name: String

content: Box<Rule>

Alias

Rename node.

Fields

content: Box<Rule>

value: String

named: bool

Token(Box<Rule>)

Force tokenization.

ImmediateToken(Box<Rule>)

Immediate tokenization.

Prec

Precedence.

Fields

value: Precedence

content: Box<Rule>

PrecLeft

Left-associative precedence.

Fields

value: Precedence

content: Box<Rule>

PrecRight

Right-associative precedence.

Fields

value: Precedence

content: Box<Rule>

PrecDynamic

Dynamic precedence.

Fields

value: i32

content: Box<Rule>

Reserved

Reserved word context.

Fields

context_name: String

content: Box<Rule>

Trait Implementations

impl Clone for Rule

fn clone(&self) -> Rule

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Rule

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Rule

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Rule

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.