Struct Evaluator 

pub struct Evaluator<'a> { /* private fields */ }

Stateful evaluator that tracks recursion depth and circular references.

Implementations

impl<'a> Evaluator<'a>

pub fn new(provider: &'a dyn CellDataProvider) -> Self

Create a new evaluator backed by the given data provider.

pub fn eval_expr(&mut self, expr: &Expr) -> Result<CellValue>

Evaluate an AST expression node.

pub fn eval_arg(&mut self, args: &[Expr], index: usize) -> Result<CellValue>

Evaluate a single argument expression at index, returning an error if the index is out of bounds.

pub fn collect_numbers(&mut self, args: &[Expr]) -> Result<Vec<f64>>

Collect all numeric values from the argument list, expanding ranges. Non-numeric values inside ranges are silently skipped (Excel semantics).

pub fn flatten_args_to_values( &mut self, args: &[Expr], ) -> Result<Vec<CellValue>>

Flatten all arguments into a Vec of CellValues, expanding ranges.

pub fn expand_range( &mut self, start: &CellReference, end: &CellReference, ) -> Result<Vec<CellValue>>

Expand a rectangular cell range into individual CellValues (row-major).

pub fn current_sheet(&self) -> &str

Return the current sheet name from the provider.