pub struct ScopeInfoDB { /* private fields */ }Expand description
Scoped symbol table.
The parser enters and exits scopes in strict stack order and always reads
and writes through the innermost active scope. ScopeInfoDB exploits this:
instead of one hash map per scope plus a parent-chain walk on lookup, it
keeps a single map from name to a stack of bindings (outermost first).
Lookup is a single hash probe; the innermost binding is the last element.
Invariant: get/set/delete must be called with the innermost active
scope, create_child must be called with the current scope as parent, and
every scope created by create_child must be exited with exit_scope
before its parent receives further operations.
Implementations§
Source§impl ScopeInfoDB
impl ScopeInfoDB
pub fn new() -> Self
pub fn create(&mut self) -> ScopeInfoId
pub fn create_child(&mut self, parent: ScopeInfoId) -> ScopeInfoId
Sourcepub fn exit_scope(&mut self, id: ScopeInfoId)
pub fn exit_scope(&mut self, id: ScopeInfoId)
Exit id, dropping all bindings introduced in it. id must be the
innermost active scope.
pub fn expect_get_scope(&self, id: ScopeInfoId) -> &ScopeInfo
pub fn expect_get_mut_scope(&mut self, id: ScopeInfoId) -> &mut ScopeInfo
pub fn expect_get_variable(&self, id: VariableInfoId) -> &VariableInfo
pub fn expect_get_tag_info(&self, id: TagInfoId) -> &TagInfo
pub fn expect_get_mut_tag_info(&mut self, id: TagInfoId) -> &mut TagInfo
Sourcepub fn get(&mut self, id: ScopeInfoId, key: &Atom) -> Option<VariableInfoId>
pub fn get(&mut self, id: ScopeInfoId, key: &Atom) -> Option<VariableInfoId>
Resolve key starting from the innermost active scope id.
pub fn set( &mut self, id: ScopeInfoId, key: Atom, variable_info_id: VariableInfoId, )
pub fn delete(&mut self, id: ScopeInfoId, key: &Atom)
Sourcepub fn scope_variables(
&self,
id: ScopeInfoId,
) -> impl Iterator<Item = (&str, VariableInfoId)>
pub fn scope_variables( &self, id: ScopeInfoId, ) -> impl Iterator<Item = (&str, VariableInfoId)>
The variables bound in scope id itself (not in enclosing scopes).
id must be an active scope.
Trait Implementations§
Source§impl Debug for ScopeInfoDB
impl Debug for ScopeInfoDB
Auto Trait Implementations§
impl !RefUnwindSafe for ScopeInfoDB
impl !Send for ScopeInfoDB
impl !Sync for ScopeInfoDB
impl !UnwindSafe for ScopeInfoDB
impl Freeze for ScopeInfoDB
impl Unpin for ScopeInfoDB
impl UnsafeUnpin for ScopeInfoDB
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