Enum Symbol 

pub enum Symbol {
    Const {
        name: Cow<'static, str>,
        value: Number,
        description: Option<Cow<'static, str>>,
        local: bool,
    },
    Func {
        name: Cow<'static, str>,
        args: usize,
        variadic: bool,
        callback: fn(&[Number]) -> Result<Number, FuncError>,
        description: Option<Cow<'static, str>>,
        local: bool,
    },
}

A symbol representing either a constant or function.

Symbols are stored in a [SymTable] and referenced during evaluation.

Variants

Const

Named constant (e.g., pi).

Fields

name: Cow<'static, str>

value: Number

description: Option<Cow<'static, str>>

local: bool

Whether this is a local constant (from let) or global (from stdlib)

Func

Function with specified arity and callback.

Fields

name: Cow<'static, str>

args: usize

Minimum number of arguments

variadic: bool

Whether the function accepts additional arguments

callback: fn(&[Number]) -> Result<Number, FuncError>

description: Option<Cow<'static, str>>

local: bool

Whether this is a local function (reserved for future use) or global (from stdlib)

Implementations

impl Symbol

pub fn name(&self) -> &str

Returns the name of the symbol.

pub fn description(&self) -> Option<&str>

Returns the description of the symbol, if available.

pub fn is_local(&self) -> bool

Returns whether this symbol is local (from let) or global (from stdlib).

Trait Implementations

impl Clone for Symbol

fn clone(&self) -> Symbol

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Symbol

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

Formats the value using the given formatter.

impl From<&Symbol> for SymbolKind

fn from(symbol: &Symbol) -> Self

Converts to this type from the input type.

impl From<&Symbol> for SymbolMetadata

fn from(symbol: &Symbol) -> Self

Converts to this type from the input type.