Enum CellInput 

pub enum CellInput {
    Literal(Value),
    Formula(String),
}

What a Workbook::set writes into a cell: a literal value or a formula.

This is the parsed shape the caller hands set; the surface layers (WASM, MCP, REST) decide how to turn a user’s raw string into one of these (a leading = selects CellInput::Formula, everything else is a literal). Keeping the discriminator explicit here avoids guessing inside the value object and keeps set engine-agnostic about input syntax while still validating formula syntax against the locked engine.

Variants

Literal(Value)

A literal cell value (schema spec §4 — a value-only cell). Must not be Value::Empty: an empty literal is byte-indistinguishable from an absent cell, so it is rejected (clear the cell instead).

Formula(String)

A formula, stored verbatim including the leading =. Its syntax is validated against the workbook’s locked engine on set; its value is Value::Empty until the next recalc (P3.3).

Trait Implementations

impl Clone for CellInput

fn clone(&self) -> CellInput

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CellInput

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for CellInput

fn eq(&self, other: &CellInput) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for CellInput