Struct EvalCtx 

pub struct EvalCtx<'r> {
    pub ctx: Context,
    pub registry: &'r Registry,
    pub resolver: Option<&'r mut dyn Resolver>,
}

Bundles the variable context, function registry, and reference resolver for use during evaluation. Passed to lazy functions so they can recursively evaluate sub-expressions.

References that are not bound as local variables (e.g. a LAMBDA parameter) are read through resolver; see crate::Resolver. When resolver is None (the default, via EvalCtx::new) every such reference reads as Value::Empty, preserving the historical contract of crate::Engine::evaluate.

Fields

ctx: Context

registry: &'r Registry

resolver: Option<&'r mut dyn Resolver>

Resolver for references not bound as local variables. None ⇒ such references read as Value::Empty (the historical crate::Engine::evaluate contract).

Implementations

impl<'r> EvalCtx<'r>

pub fn new(ctx: Context, registry: &'r Registry) -> Self

Build an EvalCtx with no resolver: unbound references read as Value::Empty. Use EvalCtx::with_resolver to supply real workbook semantics.

pub fn with_resolver( ctx: Context, registry: &'r Registry, resolver: &'r mut dyn Resolver, ) -> Self

Build an EvalCtx that resolves references through resolver.

pub fn resolve_ref(&mut self, r: &Ref) -> Value

Resolve a reference that was not bound as a local variable, delegating to EvalCtx::resolver when present and falling back to Value::Empty otherwise.