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use crate::MacroDef;
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Namespace {
Types,
Values,
// Note that only type inference uses this enum, and it doesn't care about macros.
// Macro,
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub struct PerNs<T> {
pub types: Option<T>,
pub values: Option<T>,
/// Since macros has different type, many methods simply ignore it.
/// We can only use special method like `get_macros` to access it.
pub macros: Option<MacroDef>,
}
impl<T> Default for PerNs<T> {
fn default() -> Self {
PerNs { types: None, values: None, macros: None }
}
}
impl<T> PerNs<T> {
pub fn none() -> PerNs<T> {
PerNs { types: None, values: None, macros: None }
}
pub fn values(t: T) -> PerNs<T> {
PerNs { types: None, values: Some(t), macros: None }
}
pub fn types(t: T) -> PerNs<T> {
PerNs { types: Some(t), values: None, macros: None }
}
pub fn both(types: T, values: T) -> PerNs<T> {
PerNs { types: Some(types), values: Some(values), macros: None }
}
pub fn macros(macro_: MacroDef) -> PerNs<T> {
PerNs { types: None, values: None, macros: Some(macro_) }
}
pub fn is_none(&self) -> bool {
self.types.is_none() && self.values.is_none() && self.macros.is_none()
}
pub fn is_all(&self) -> bool {
self.types.is_some() && self.values.is_some() && self.macros.is_some()
}
pub fn take_types(self) -> Option<T> {
self.types
}
pub fn take_values(self) -> Option<T> {
self.values
}
pub fn get_macros(&self) -> Option<MacroDef> {
self.macros
}
pub fn only_macros(&self) -> PerNs<T> {
PerNs { types: None, values: None, macros: self.macros }
}
pub fn as_ref(&self) -> PerNs<&T> {
PerNs { types: self.types.as_ref(), values: self.values.as_ref(), macros: self.macros }
}
pub fn or(self, other: PerNs<T>) -> PerNs<T> {
PerNs {
types: self.types.or(other.types),
values: self.values.or(other.values),
macros: self.macros.or(other.macros),
}
}
/// Map types and values. Leave macros unchanged.
pub fn map<U>(self, f: impl Fn(T) -> U) -> PerNs<U> {
PerNs { types: self.types.map(&f), values: self.values.map(&f), macros: self.macros }
}
}
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