Struct FeatureStructure 

pub struct FeatureStructure { /* private fields */ }

Immutable canonical feature structure with explicit reentrancies.

Implementations

impl FeatureStructure

pub fn root(&self) -> FeatureStructureNodeId

Return the root node.

pub fn node( &self, id: FeatureStructureNodeId, ) -> Option<FeatureStructureNode<'_>>

Inspect a node without exposing the mutable graph representation.

pub fn attributes( &self, id: FeatureStructureNodeId, ) -> Option<impl ExactSizeIterator<Item = FeatureStructureAttribute<'_>> + '_>

Return the ordered attributes of a map node.

pub fn empty() -> Self

Construct an empty attribute-value matrix.

pub fn parse(input: &str) -> Result<Self, FeatureStructureParseError>

Parse Alto feature-structure syntax.

Attribute-value matrices use [attribute: value]; #name introduces or refers to a reentrant variable.

pub fn unify(&self, other: &Self) -> Option<Self>

Compute non-destructive unification, or return None on a clash.

pub fn project(&self, attribute: &str) -> Option<Self>

Return the value stored under a top-level attribute.

pub fn embed(&self, attribute: &str) -> Self

Wrap this value in a new one-attribute feature structure.

pub fn remap(&self, mappings: &[(&str, &str)]) -> Option<Self>

Select and rename several top-level attributes.

Each pair is (source, target). The operation returns None when a source attribute is absent or two mappings use the same target. Reentrancies among selected values are preserved.

Trait Implementations

impl Clone for FeatureStructure

fn clone(&self) -> FeatureStructure

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FeatureStructure

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

Formats the value using the given formatter.

impl Display for FeatureStructure

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

Formats the value using the given formatter.

impl Eq for FeatureStructure

impl Hash for FeatureStructure

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 OutputCodec<FeatureStructure> for FeatureStructureVisualizationCodec

type Output = VisualRepresentation

The representation produced by this codec.

fn metadata(&self) -> &'static CodecMetadata

Return static codec metadata. This must not inspect or encode a value.

fn encode(&self, value: &FeatureStructure) -> Self::Output

Encode value.

impl PartialEq for FeatureStructure

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for FeatureStructure