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use std::fmt;
use ra_syntax::{ast, SmolStr};
/// `Name` is a wrapper around string, which is used in hir for both references
/// and declarations. In theory, names should also carry hygiene info, but we are
/// not there yet!
#[derive(Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct Name {
text: SmolStr,
}
impl fmt::Display for Name {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&self.text, f)
}
}
impl fmt::Debug for Name {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(&self.text, f)
}
}
impl Name {
/// Note: this is private to make creating name from random string hard.
/// Hopefully, this should allow us to integrate hygiene cleaner in the
/// future, and to switch to interned representation of names.
const fn new(text: SmolStr) -> Name {
Name { text }
}
pub(crate) fn missing() -> Name {
Name::new("[missing name]".into())
}
pub(crate) fn tuple_field_name(idx: usize) -> Name {
Name::new(idx.to_string().into())
}
// Needed for Deref
pub(crate) fn target() -> Name {
Name::new("Target".into())
}
// There's should be no way to extract a string out of `Name`: `Name` in the
// future, `Name` will include hygiene information, and you can't encode
// hygiene into a String.
//
// If you need to compare something with `Name`, compare `Name`s directly.
//
// If you need to render `Name` for the user, use the `Display` impl, but be
// aware that it strips hygiene info.
#[deprecated(note = "use to_string instead")]
pub fn as_smolstr(&self) -> &SmolStr {
&self.text
}
}
pub(crate) trait AsName {
fn as_name(&self) -> Name;
}
impl AsName for ast::NameRef {
fn as_name(&self) -> Name {
let name = resolve_name(self.text());
Name::new(name)
}
}
impl AsName for ast::Name {
fn as_name(&self) -> Name {
let name = resolve_name(self.text());
Name::new(name)
}
}
impl<'a> AsName for ast::FieldKind<'a> {
fn as_name(&self) -> Name {
match self {
ast::FieldKind::Name(nr) => nr.as_name(),
ast::FieldKind::Index(idx) => Name::new(idx.text().clone()),
}
}
}
impl AsName for ra_db::Dependency {
fn as_name(&self) -> Name {
Name::new(self.name.clone())
}
}
pub(crate) const ISIZE: Name = Name::new(SmolStr::new_inline_from_ascii(5, b"isize"));
pub(crate) const I8: Name = Name::new(SmolStr::new_inline_from_ascii(2, b"i8"));
pub(crate) const I16: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"i16"));
pub(crate) const I32: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"i32"));
pub(crate) const I64: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"i64"));
pub(crate) const I128: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"i128"));
pub(crate) const USIZE: Name = Name::new(SmolStr::new_inline_from_ascii(5, b"usize"));
pub(crate) const U8: Name = Name::new(SmolStr::new_inline_from_ascii(2, b"u8"));
pub(crate) const U16: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"u16"));
pub(crate) const U32: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"u32"));
pub(crate) const U64: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"u64"));
pub(crate) const U128: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"u128"));
pub(crate) const F32: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"f32"));
pub(crate) const F64: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"f64"));
pub(crate) const BOOL: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"bool"));
pub(crate) const CHAR: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"char"));
pub(crate) const STR: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"str"));
pub(crate) const SELF_PARAM: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"self"));
pub(crate) const SELF_TYPE: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"Self"));
pub(crate) const MACRO_RULES: Name = Name::new(SmolStr::new_inline_from_ascii(11, b"macro_rules"));
pub(crate) const STD: Name = Name::new(SmolStr::new_inline_from_ascii(3, b"std"));
pub(crate) const ITER: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"iter"));
pub(crate) const INTO_ITERATOR: Name =
Name::new(SmolStr::new_inline_from_ascii(12, b"IntoIterator"));
pub(crate) const ITEM: Name = Name::new(SmolStr::new_inline_from_ascii(4, b"Item"));
fn resolve_name(text: &SmolStr) -> SmolStr {
let raw_start = "r#";
if text.as_str().starts_with(raw_start) {
SmolStr::new(&text[raw_start.len()..])
} else {
text.clone()
}
}
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