Struct Scope 

pub struct Scope {
    pub import_stack: Vec<String>,
    pub env: Rc<Val>,
    pub curr_val: Option<Rc<Val>>,
    pub build_output: ValueMap,
    pub search_curr_val: bool,
    pub strict: bool,
}

Defines a scope for execution in ucg.

Scopes in ucg are defined by the currently executing file and the complex data types in that file. (Tuple, List, Modules, and the left operands for dot selectors).

UCG Scopes do not descend up into their parent scopes so we do not maintain a stack for those.

Fields

import_stack: Vec<String>

env: Rc<Val>

curr_val: Option<Rc<Val>>

build_output: ValueMap

search_curr_val: bool

strict: bool

Implementations

impl Scope

pub fn new(env: Rc<Val>) -> Self

pub fn use_strict(self) -> Self

pub fn use_curr_val(self) -> Self

pub fn spawn_child(&self) -> Self

Spawn a child scope based on the current scope but without the current val set.

pub fn spawn_clean(&self) -> Self

pub fn push_import<S: Into<String>>(&mut self, path: S)

Push an import onto the import stack.

pub fn prepend_import_stack(&mut self, imports: &Vec<String>)

pub fn set_curr_val(self, val: Rc<Val>) -> Self

Set the current value for our execution context.

pub fn lookup_idx( &self, pos: &Position, idx: &Val, ) -> Result<Rc<Val>, Box<dyn Error>>

Lookup up a list index in the current value

pub fn lookup_sym( &self, sym: &PositionedItem<String>, is_symbol: bool, ) -> Option<Rc<Val>>

Lookup a symbol in the current execution context.

The lookup rules are simple.

• env is always an environment variable lookup.
• self is always the current value. This symbol is only valid when the current value is a tuple.
• everything else is looked up in the currently accumulated build output for this execution context.

Trait Implementations

impl Clone for Scope

fn clone(&self) -> Scope

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Scope

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

Formats the value using the given formatter.

impl PartialEq for Scope

fn eq(&self, other: &Scope) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Scope