Struct NameIndex 

pub struct NameIndex { /* private fields */ }

Bidirectional mapping between declaration names and compact u32 identifiers.

Assigning a dense integer id to each name enables O(1) lookup by id and compact storage in downstream indices.

Implementations

impl NameIndex

pub fn new() -> Self

Create a new, empty NameIndex.

pub fn insert(&mut self, name: &str) -> u32

Insert name and return its assigned id.

If name was already inserted the existing id is returned unchanged; no duplicate entry is created.

pub fn lookup_id(&self, name: &str) -> Option<u32>

Look up the id of name, returning None if it has not been inserted.

pub fn lookup_name(&self, id: u32) -> Option<&str>

Look up the name string for id, returning None if out of range.

pub fn len(&self) -> usize

Return the number of indexed names.

pub fn is_empty(&self) -> bool

Return true if no names have been inserted.

Trait Implementations

impl Clone for NameIndex

fn clone(&self) -> NameIndex

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NameIndex

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

Formats the value using the given formatter.

impl Default for NameIndex

fn default() -> Self

Returns the “default value” for a type.