Interface IRuntimeVariableLookup
- Namespace
- Hi.NcParsers.EvaluationSyntaxs.Evaluation
- Assembly
- HiMech.dll
Stateless variable lookup that needs per-block runtime context — the
current SyntaxPiece node (for Previous
traceback into runtime-state sections like MachineCoordinateState
/ ProgramXyz) and the dependency list (so the lookup can read
from sibling dependencies without holding a static reference).
Distinguished from IVariableLookup: that one is for
long-lived dependencies that already hold their own data (parameter
tables, tool-offset wrappers, retained-variable tables) and need no
block context. IRuntimeVariableLookup is for context-sensitive
resolutions configured declaratively on
RuntimeVariableLookups.
Implementations should be brand-specific (e.g. Fanuc #5001-#5043
position reads) and return null for keys outside their range so
the evaluator's chain can fall through to the next lookup.
Implementations are XML-serialised as part of
VariableEvaluatorSyntax's round-trip: each impl exposes a
static XName, registers itself with Generators,
and implements MakeXmlSource(string, string, bool). Since impls
are stateless, the typical body is just an empty element carrying the
type name; brand identity is restored by XFactory dispatch.
public interface IRuntimeVariableLookup : IMakeXmlSource- Inherited Members
- Extension Methods
Methods
Get(string, LazyLinkedListNode<SyntaxPiece>, IReadOnlyList<INcDependency>)
Returns the value of the variable identified by key
in the context of node and
dependencies, or null if the key is outside
this lookup's range or the value is vacant.
double? Get(string key, LazyLinkedListNode<SyntaxPiece> node, IReadOnlyList<INcDependency> dependencies)Parameters
keystringnodeLazyLinkedListNode<SyntaxPiece>dependenciesIReadOnlyList<INcDependency>