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use std::{
array::IntoIter,
cmp::{self, Ordering},
fmt, hash,
};
use heck::{CamelCase, SnakeCase};
use proc_macro2::{Ident, Span};
use syn::{ext::IdentExt, spanned::Spanned};
#[derive(Clone, Debug)]
pub enum Content {
Spanned(Ident),
Spanless(String),
}
impl Spanned for Content {
fn span(&self) -> Span {
match self {
Content::Spanned(i) => i.span(),
Content::Spanless(_) => Span::call_site(),
}
}
}
impl From<Content> for Ident {
fn from(content: Content) -> Self {
match content {
Content::Spanned(i) => i,
Content::Spanless(s) => Ident::new(&s, Span::call_site()),
}
}
}
impl CamelCase for Content {
fn to_camel_case(&self) -> Self::Owned {
match self {
Self::Spanned(ident) => {
let span = ident.span();
let name = ident.unraw().to_string();
Ident::new(&name.to_camel_case(), span).into()
}
Self::Spanless(name) => name.to_camel_case().into(),
}
}
}
impl SnakeCase for Content {
fn to_snake_case(&self) -> Self::Owned {
match self {
Self::Spanned(ident) => {
let span = ident.span();
let name = ident.unraw().to_string();
Ident::new(&name.to_snake_case(), span).into()
}
Self::Spanless(name) => name.to_snake_case().into(),
}
}
}
impl PartialEq for Content {
fn eq(&self, other: &Self) -> bool {
match (self, other) {
(Self::Spanned(me), Self::Spanned(them)) => me == them,
(Self::Spanned(me), Self::Spanless(them)) => me.unraw() == them,
(Self::Spanless(me), Self::Spanned(them)) => them.unraw() == me,
(Self::Spanless(me), Self::Spanless(them)) => me == them,
}
}
}
impl<T: AsRef<str>> PartialEq<T> for Content {
fn eq(&self, other: &T) -> bool {
match self {
Self::Spanned(me) => me.unraw() == other,
Self::Spanless(me) => me == other.as_ref(),
}
}
}
impl Eq for Content {}
impl hash::Hash for Content {
fn hash<H: hash::Hasher>(&self, state: &mut H) {
match self {
Self::Spanned(i) => i.unraw().to_string().hash(state),
Self::Spanless(s) => s.hash(state),
}
}
}
impl fmt::Display for Content {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Spanned(i) => i.fmt(f),
Self::Spanless(s) => s.fmt(f),
}
}
}
impl From<Ident> for Content {
fn from(ident: Ident) -> Self {
Self::Spanned(ident)
}
}
impl From<String> for Content {
fn from(string: String) -> Self {
Self::Spanless(string)
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum Kind {
Label,
Let,
Variable,
}
impl PartialOrd for Kind {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(match (self, other) {
(Kind::Label, Kind::Label)
| (Kind::Let, Kind::Let)
| (Kind::Variable, Kind::Variable) => Ordering::Equal,
(Kind::Label, Kind::Let)
| (Kind::Label, Kind::Variable)
| (Kind::Let, Kind::Variable) => Ordering::Greater,
(Kind::Let, Kind::Label)
| (Kind::Variable, Kind::Label)
| (Kind::Variable, Kind::Let) => Ordering::Less,
})
}
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct Name {
pub content: Content,
kind: Kind,
}
impl Name {
pub fn new_variable<T: Into<Content>>(content: T) -> Self {
Self {
content: content.into(),
kind: Kind::Variable,
}
}
pub fn new_let<T: Into<Content>>(content: T) -> Self {
Self {
content: content.into(),
kind: Kind::Let,
}
}
pub fn new_label<T: Into<Content>>(content: T) -> Self {
Self {
content: content.into(),
kind: Kind::Label,
}
}
pub fn merge(this: Option<Self>, that: Option<Self>) -> Option<Self> {
match (this, that) {
(None, that) => that,
(Some(this), None) => Some(this),
(Some(this), Some(that)) => {
if this.kind >= that.kind {
Some(this)
} else {
Some(that)
}
}
}
}
pub fn merge_all<I: IntoIterator<Item = Option<Self>>>(iter: I) -> Option<Self> {
iter.into_iter().fold(None, Self::merge)
}
}
impl Spanned for Name {
fn span(&self) -> Span {
self.content.span()
}
}
impl From<Name> for Ident {
fn from(name: Name) -> Self {
name.content.into()
}
}
impl CamelCase for Name {
fn to_camel_case(&self) -> Self::Owned {
Self {
content: self.content.to_camel_case(),
kind: self.kind,
}
}
}
impl SnakeCase for Name {
fn to_snake_case(&self) -> Self::Owned {
Self {
content: self.content.to_snake_case(),
kind: self.kind,
}
}
}
impl fmt::Display for Name {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.content.fmt(f)
}
}
|
