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 { 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 { 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()) } } // 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()) } } 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() } }