Struct VarScope 

pub struct VarScope { /* private fields */ }

Mapping of variable names to indices inside a scope (e.g. a rule or a query).

Implementations

impl VarScope

pub fn new() -> Self

pub fn get(&self, name: &str) -> Option<Var>

Return the variable with the given name, if one exists.

pub fn get_or_insert(&mut self, name: &str) -> Var

Get the index associated with a name, or insert a new association.

pub fn insert_wildcard(&mut self) -> Var

Insert a new unnamed wildcard variable.

pub fn get_name(&self, var: Var) -> Option<&str>

Return the associated name of the given variable.

pub fn iter_names(&self) -> impl Iterator<Item = &str>

Returns the names of variables

Trait Implementations

impl Clone for VarScope

fn clone(&self) -> VarScope

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VarScope

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

Formats the value using the given formatter.

impl Default for VarScope

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for VarScope

fn eq(&self, other: &VarScope) -> 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 Eq for VarScope

impl StructuralPartialEq for VarScope