Struct tree_sitter_graph::Variables

pub struct Variables { /* fields omitted */ }

An environment of named variables

Implementations

impl Variables

pub fn new() -> Variables

Creates a new, empty environment of variables.

pub fn add_mutable(&mut self, name: Identifier, value: Value) -> Result<(), ()>

Adds a new mutable variable to an environment, returning an error if the variable already exists.

pub fn add_immutable(
    &mut self,
    name: Identifier,
    value: Value
) -> Result<(), ()>

Adds a new immutable variable to an environment, returning an error if the variable already exists.

pub fn get(&self, name: Identifier) -> Option<&Value>

Returns the value of a variable, if it exists in this environment.

pub fn clear(&mut self)

Clears this list of variables.

Trait Implementations

impl Default for Variables

fn default() -> Variables

Returns the “default value” for a type.