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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.
fn new(text: SmolStr) -> Name {
Name { text }
}
pub(crate) fn missing() -> Name {
Name::new("[missing name]".into())
}
pub(crate) fn self_param() -> Name {
Name::new("self".into())
}
pub(crate) fn self_type() -> Name {
Name::new("Self".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) fn as_known_name(&self) -> Option<KnownName> {
let name = match self.text.as_str() {
"isize" => KnownName::Isize,
"i8" => KnownName::I8,
"i16" => KnownName::I16,
"i32" => KnownName::I32,
"i64" => KnownName::I64,
"i128" => KnownName::I128,
"usize" => KnownName::Usize,
"u8" => KnownName::U8,
"u16" => KnownName::U16,
"u32" => KnownName::U32,
"u64" => KnownName::U64,
"u128" => KnownName::U128,
"f32" => KnownName::F32,
"f64" => KnownName::F64,
"bool" => KnownName::Bool,
"char" => KnownName::Char,
"str" => KnownName::Str,
"Self" => KnownName::SelfType,
"self" => KnownName::SelfParam,
"macro_rules" => KnownName::MacroRules,
_ => return None,
};
Some(name)
}
}
pub(crate) trait AsName {
fn as_name(&self) -> Name;
}
impl AsName for ast::NameRef {
fn as_name(&self) -> Name {
Name::new(self.text().clone())
}
}
impl AsName for ast::Name {
fn as_name(&self) -> Name {
Name::new(self.text().clone())
}
}
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())
}
}
// Ideally, should be replaced with
// ```
// const ISIZE: Name = Name::new("isize")
// ```
// but const-fn is not that powerful yet.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) enum KnownName {
Isize,
I8,
I16,
I32,
I64,
I128,
Usize,
U8,
U16,
U32,
U64,
U128,
F32,
F64,
Bool,
Char,
Str,
SelfType,
SelfParam,
MacroRules,
}
impl AsName for KnownName {
fn as_name(&self) -> Name {
let s = match self {
KnownName::Isize => "isize",
KnownName::I8 => "i8",
KnownName::I16 => "i16",
KnownName::I32 => "i32",
KnownName::I64 => "i64",
KnownName::I128 => "i128",
KnownName::Usize => "usize",
KnownName::U8 => "u8",
KnownName::U16 => "u16",
KnownName::U32 => "u32",
KnownName::U64 => "u64",
KnownName::U128 => "u128",
KnownName::F32 => "f32",
KnownName::F64 => "f64",
KnownName::Bool => "bool",
KnownName::Char => "char",
KnownName::Str => "str",
KnownName::SelfType => "Self",
KnownName::SelfParam => "self",
KnownName::MacroRules => "macro_rules",
};
Name::new(s.into())
}
}
|
