Struct Context 

pub struct Context {
    pub vars: HashMap<String, Value>,
}

Holds the named variable bindings for a formula evaluation.

All keys are stored and looked up in uppercase, so variable names are case-insensitive (A1, a1, and A1 all refer to the same binding).

Fields

vars: HashMap<String, Value>

Implementations

impl Context

pub fn new(vars: HashMap<String, Value>) -> Self

Create a Context from a map of variable name → value. Keys are normalised to uppercase on insertion.

pub fn empty() -> Self

Create an empty Context with no variable bindings.

pub fn get(&self, name: &str) -> Value

Look up a variable by name (case-insensitive). Returns Value::Empty if not found.

pub fn set(&mut self, name: String, value: Value) -> Option<Value>

Insert or overwrite a binding. Returns the previous value if one existed.

pub fn remove(&mut self, name: &str)

Remove a binding. Used to restore context after lambda/let evaluation.