Enum PredictionContext 

pub enum PredictionContext {
    Empty {
        cached_hash: u64,
    },
    Singleton {
        parent: Rc<Self>,
        return_state: usize,
        cached_hash: u64,
    },
    Array {
        parents: Vec<Rc<Self>>,
        return_states: Vec<usize>,
        cached_hash: u64,
    },
}

Variants

Empty

Fields

cached_hash: u64

Singleton

Fields

parent: Rc<Self>

return_state: usize

cached_hash: u64

Array

Fields

parents: Vec<Rc<Self>>

return_states: Vec<usize>

cached_hash: u64

Implementations

impl PredictionContext

pub fn empty() -> Rc<Self>

pub fn singleton(parent: Rc<Self>, return_state: usize) -> Rc<Self>

pub const fn cached_hash(&self) -> u64

pub const fn len(&self) -> usize

pub const fn is_empty(&self) -> bool

pub fn return_state(&self, index: usize) -> Option<usize>

pub fn parent(&self, index: usize) -> Option<Rc<Self>>

pub fn has_empty_path(&self) -> bool

pub fn merge(left: Rc<Self>, right: Rc<Self>) -> Rc<Self>

pub fn merge_with_options( left: Rc<Self>, right: Rc<Self>, root_is_wildcard: bool, cache: Option<&mut PredictionContextMergeCache>, ) -> Rc<Self>

Merges two prediction contexts using ANTLR’s SLL/LL root semantics.

In SLL mode the empty root is a wildcard: $ + x = $. In full LL mode it is an ordinary array entry: $ + x = [$, x]. The optional merge cache is intentionally per prediction operation so large conflict-heavy parses can drop the cache immediately after adaptive_predict.

Trait Implementations

impl Clone for PredictionContext

fn clone(&self) -> PredictionContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PredictionContext

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

Formats the value using the given formatter.

impl Eq for PredictionContext

impl Hash for PredictionContext

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for PredictionContext

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PredictionContext

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for PredictionContext

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.