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|
//! In rust, it is possible to have a value, a type and a macro with the same
//! name without conflicts.
//!
//! `PerNs` (per namespace) captures this.
use hir_expand::MacroDefId;
use crate::{item_scope::ItemInNs, visibility::Visibility, ModuleDefId};
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub struct PerNs {
pub types: Option<(ModuleDefId, Visibility)>,
pub values: Option<(ModuleDefId, Visibility)>,
pub macros: Option<(MacroDefId, Visibility)>,
}
impl Default for PerNs {
fn default() -> Self {
PerNs { types: None, values: None, macros: None }
}
}
impl PerNs {
pub fn none() -> PerNs {
PerNs { types: None, values: None, macros: None }
}
pub fn values(t: ModuleDefId, v: Visibility) -> PerNs {
PerNs { types: None, values: Some((t, v)), macros: None }
}
pub fn types(t: ModuleDefId, v: Visibility) -> PerNs {
PerNs { types: Some((t, v)), values: None, macros: None }
}
pub fn both(types: ModuleDefId, values: ModuleDefId, v: Visibility) -> PerNs {
PerNs { types: Some((types, v)), values: Some((values, v)), macros: None }
}
pub fn macros(macro_: MacroDefId, v: Visibility) -> PerNs {
PerNs { types: None, values: None, macros: Some((macro_, v)) }
}
pub fn is_none(&self) -> bool {
self.types.is_none() && self.values.is_none() && self.macros.is_none()
}
pub fn take_types(self) -> Option<ModuleDefId> {
self.types.map(|it| it.0)
}
pub fn take_types_vis(self) -> Option<(ModuleDefId, Visibility)> {
self.types
}
pub fn take_values(self) -> Option<ModuleDefId> {
self.values.map(|it| it.0)
}
pub fn take_macros(self) -> Option<MacroDefId> {
self.macros.map(|it| it.0)
}
pub fn filter_visibility(self, mut f: impl FnMut(Visibility) -> bool) -> PerNs {
PerNs {
types: self.types.filter(|(_, v)| f(*v)),
values: self.values.filter(|(_, v)| f(*v)),
macros: self.macros.filter(|(_, v)| f(*v)),
}
}
pub fn with_visibility(self, vis: Visibility) -> PerNs {
PerNs {
types: self.types.map(|(it, _)| (it, vis)),
values: self.values.map(|(it, _)| (it, vis)),
macros: self.macros.map(|(it, _)| (it, vis)),
}
}
pub fn or(self, other: PerNs) -> PerNs {
PerNs {
types: self.types.or(other.types),
values: self.values.or(other.values),
macros: self.macros.or(other.macros),
}
}
pub fn iter_items(self) -> impl Iterator<Item = ItemInNs> {
self.types
.map(|it| ItemInNs::Types(it.0))
.into_iter()
.chain(self.values.map(|it| ItemInNs::Values(it.0)).into_iter())
.chain(self.macros.map(|it| ItemInNs::Macros(it.0)).into_iter())
}
}
|
