Struct Context

pub struct Context {
    pub functions: HashMap<String, (Vec<String>, Box<Expression>)>,
    pub variables: HashMap<String, Box<Expression>>,
    pub rounding: Rounding,
    pub angle_unit: AngleUnit,
    pub depth_limit: DepthLimit,
}

Contains user-defined functions and constants.

Fields

functions: HashMap<String, (Vec<String>, Box<Expression>)>

Function declared by the user at runtime.

variables: HashMap<String, Box<Expression>>

Variables declared by the user at runtime.

rounding: Rounding

The decimal digits to display.

angle_unit: AngleUnit

The angle unit to use.

depth_limit: DepthLimit

Depth limit for recursion control. .

Implementations

impl Context

pub fn new( rounding: Rounding, angle_unit: AngleUnit, depth_limit: DepthLimit, ) -> Self

Generates an empty context.

pub fn join_with(&mut self, context: &Self)

Add all the functions and variables of another context to this one.

pub fn add_function( &mut self, identifier: String, params: Vec<String>, body: Box<Expression>, )

Add a function to the user-defined ones.

pub fn add_variable(&mut self, identifier: String, expression: Box<Expression>)

Add a variable to the user-defined ones.

pub fn get_function( &self, identifier: &str, ) -> Option<(Vec<String>, Box<Expression>)>

Returns a user-defined function given an identifier.

pub fn get_var(&self, identifier: &str) -> Option<Box<Expression>>

Returns a user-defined constant given an identifier.

pub fn is_function(&self, identifier: &str) -> bool

Returns true if the identifier refers to a user-defined function.

pub fn is_var(&self, identifier: &str) -> bool

Returns true if the identifier refers to a user-defined constant.

Trait Implementations

impl Clone for Context

fn clone(&self) -> Context

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Context

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

Formats the value using the given formatter.

impl Default for Context

fn default() -> Self

Returns the “default value” for a type.