[−][src]Module cfg::history

Any data carried alongside a grammar rule can be its history. Rule histories may contain more than semantic actions.

Structs

CloneHistory	Clone history.
DefaultHistory	Factory of default histories.
NullHistory	A history which carries no data. All operations on `NullHistory` are no-op.
NullHistorySource	A source that only works for building NullHistory.

Used to inform which symbols on a rule'Symbol RHS are nullable, and will be eliminated.

Action	Trait for history types that may have semantic actions.
AssignPrecedence	Trait for history types that allow the rule to have its precedence assigned.
Binarize	Trait for history types that allow the rule to be binarized.
EliminateNulling	Trait for history types that allow the rule to have nulling symbols eliminated from the RHS.
HistorySource	A trait for history factories.
RewriteSequence	Trait for history types that allow the sequence rule to be rewritten into grammar rules.