Struct Engine 

pub struct Engine { /* private fields */ }

Implementations

impl Engine

pub fn sheets() -> Self

Engine targeting Google Sheets conformance.

pub fn excel() -> Self

Engine targeting Excel conformance.

Excel evaluation semantics are not implemented yet (they land in a later phase): Engine::evaluate returns Value::Error(ErrorKind::NA) for every formula. Engine::parse and Engine::validate work.

pub fn google_sheets() -> Self

👎Deprecated:

use Engine::sheets() — engine flavor is required; see ADR 2026-04-27

Deprecated alias for Engine::sheets.

pub fn parse(&self, formula: &str) -> Result<Expr, ParseError>

Parse a formula string into an expression tree.

The formula may start with =. Returns a ParseError if the input is not a valid formula.

pub fn validate(&self, formula: &str) -> Result<(), ParseError>

Validate that a formula string is syntactically correct without returning the AST.

pub fn evaluate( &self, formula: &str, variables: &HashMap<String, Value>, ) -> Value