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546: Support dashed custom tag names r=jstarry a=jstarry Fixes #193 Co-authored-by: Justin Starry <jstarry@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| use crate::Peek; | ||
| use boolinator::Boolinator; | ||
| use proc_macro2::Ident; | ||
| use proc_macro2::Span; | ||
| use quote::{quote, ToTokens}; | ||
| use std::fmt; | ||
| use syn::buffer::Cursor; | ||
| use syn::parse::{Parse, ParseStream, Result as ParseResult}; | ||
| use syn::Token; | ||
|
|
||
| #[derive(PartialEq)] | ||
| pub struct HtmlDashedName { | ||
| pub name: Ident, | ||
| pub extended: Vec<(Token![-], Ident)>, | ||
| } | ||
|
|
||
| impl HtmlDashedName { | ||
| pub fn new(name: Ident) -> Self { | ||
| HtmlDashedName { | ||
| name, | ||
| extended: Vec::new(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl fmt::Display for HtmlDashedName { | ||
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
| write!(f, "{}", self.name)?; | ||
| for (_, ident) in &self.extended { | ||
| write!(f, "-{}", ident)?; | ||
| } | ||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| impl Peek<'_, Self> for HtmlDashedName { | ||
| fn peek(cursor: Cursor) -> Option<(Self, Cursor)> { | ||
| let (name, cursor) = cursor.ident()?; | ||
| (name.to_string().to_lowercase() == name.to_string()).as_option()?; | ||
|
|
||
| let mut extended = Vec::new(); | ||
| let mut cursor = cursor; | ||
| loop { | ||
| if let Some((punct, p_cursor)) = cursor.punct() { | ||
| if punct.as_char() == '-' { | ||
| let (ident, i_cursor) = p_cursor.ident()?; | ||
| cursor = i_cursor; | ||
| extended.push((Token), ident)); | ||
| continue; | ||
| } | ||
| } | ||
| break; | ||
| } | ||
|
|
||
| Some((HtmlDashedName { name, extended }, cursor)) | ||
| } | ||
| } | ||
|
|
||
| impl Parse for HtmlDashedName { | ||
| fn parse(input: ParseStream) -> ParseResult<Self> { | ||
| let name = if let Ok(token) = input.parse::<Token![type]>() { | ||
| Ident::new("type", token.span).into() | ||
| } else if let Ok(token) = input.parse::<Token![for]>() { | ||
| Ident::new("for", token.span).into() | ||
| } else { | ||
| input.parse::<Ident>()?.into() | ||
| }; | ||
|
|
||
| let mut extended = Vec::new(); | ||
| while input.peek(Token![-]) { | ||
| extended.push((input.parse::<Token![-]>()?, input.parse::<Ident>()?)); | ||
| } | ||
|
|
||
| Ok(HtmlDashedName { name, extended }) | ||
| } | ||
| } | ||
|
|
||
| impl ToTokens for HtmlDashedName { | ||
| fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) { | ||
| let HtmlDashedName { name, extended } = self; | ||
| let dashes = extended.iter().map(|(dash, _)| quote! {#dash}); | ||
| let idents = extended.iter().map(|(_, ident)| quote! {#ident}); | ||
| let extended = quote! { #(#dashes#idents)* }; | ||
| tokens.extend(quote! {#name#extended}); | ||
| } | ||
| } |
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