Struct AltMatch 

pub struct AltMatch {
    pub p: Option<String>,
    pub r: Option<String>,
    pub b: usize,
    pub n: HashMap<String, i32>,
    pub u: HashMap<String, Value>,
    pub k: HashMap<String, Value>,
    pub g: Vec<String>,
    pub e: Option<Box<Token>>,
    pub h: Option<AltModifierWithMatch>,
    pub actions: Vec<AltActionBinding>,
    pub action_configs: HashMap<String, Value>,
}

Effective result of matching one alternate. Dynamic error/routing/backtrack callbacks are resolved into this record before the modifier runs, matching TypeScript’s AltMatch contract.

Fields

p: Option<String>

r: Option<String>

b: usize

n: HashMap<String, i32>

u: HashMap<String, Value>

k: HashMap<String, Value>

g: Vec<String>

e: Option<Box<Token>>

The alternate’s error token, boxed. A Token is 248 bytes and this record is moved twice per rule step, so carrying one inline made AltMatch 560 bytes of which 248 were an error almost no alternate raises. The box costs an allocation only on the error path, which is already the expensive one.

h: Option<AltModifierWithMatch>

Canonical post-match modifier attached to the selected alternate. It remains visible to the modifier itself and later actions even though changing it after selection does not rerun the phase.

actions: Vec<AltActionBinding>

action_configs: HashMap<String, Value>

Trait Implementations

impl Clone for AltMatch

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for AltMatch

fn default() -> Self

Returns the “default value” for a type.