Module eval 

The formula evaluator.

Expressions evaluate to Ev: a value, a reference (one or more areas, kept unresolved so ROW, OFFSET, INDEX, : and friends can work on references) or a lambda. Cell reads go through Host, which lets the recalculation engine evaluate dirty precedents on demand.

Structs

Area

Evaluator

Lambda

Enums

Ev

Constants

MAX_CELLS

Largest array a reference may expand to.

SPECIAL_FUNCTIONS

Names of functions the evaluator implements itself (merged into the function list for UI).

Traits

Host

What the evaluator needs from its surroundings.

Functions

binary_values

is_known_function

precedents

Collects the static references of an expression with their sheets resolved; dynamic is set when the formula uses INDIRECT/OFFSET/names/tables whose targets can change.

r1c1_to_a1

Converts an R1C1 reference text to A1 (for INDIRECT(…, FALSE)). Ok(None) means the text is not R1C1; Err means it is R1C1 but points past the sheet.

resized_sum_range

The range SUMIF/AVERAGEIF add up: from the sum range’s top-left cell, as many rows and columns as the criteria range (height × width), cut off at the sheet’s edge.

zip2

Element-wise combination with Excel’s broadcasting.