Enum Visibility 

pub enum Visibility {
    Public,
    Private,
}

Whether an item is visible outside the module that declares it.

Visibility gates cross-module access only: a module can always reach its own names, public or private, but an import from another module reaches a name only if it is Public. A Private name reached through an import resolves to ResolveError::Private.

Examples

use intern_lang::Interner;
use module_lang::{ModuleGraph, ResolveError, Visibility};
use source_lang::SourceMap;

let mut sources = SourceMap::new();
let mut names = Interner::new();
let mut graph: ModuleGraph<()> = ModuleGraph::new();

let lib = graph.add_module(names.intern("lib"), sources.add("lib", "").expect("fits"));
let app = graph.add_module(names.intern("app"), sources.add("app", "").expect("fits"));
let secret = names.intern("secret");

graph.define(lib, secret, Visibility::Private, ())?;

// `lib` sees its own private name.
assert!(graph.resolve(lib, secret).is_ok());

// `app` imports it, but the import cannot reach a private name.
graph.import(app, lib, secret)?;
assert!(matches!(graph.resolve(app, secret), Err(ResolveError::Private { .. })));

Variants

Public

Resolvable from other modules through an import.

Private

Resolvable only from within the module that declares it.

Trait Implementations

impl Clone for Visibility

fn clone(&self) -> Visibility

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Visibility

impl Debug for Visibility

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Visibility

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Visibility

impl Hash for Visibility

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Visibility

fn eq(&self, other: &Visibility) -> 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 Serialize for Visibility

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Visibility