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use quote::{quote_spanned, ToTokens};
use proc_macro2::{Span};
use syn::parse::{Parse, ParseStream, Result};
use syn::{Token};
use crate::xhtml::Xhtml;
pub enum XhtmlDisplay {
X(Xhtml)
}
impl ToTokens for XhtmlDisplay {
fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
match self {
XhtmlDisplay::X(xhtmls) => {
let expanded = quote_spanned! { xhtmls.span() =>
{
let mut stream = String::new();
#xhtmls
stream
}
};
expanded.to_tokens(tokens);
}
}
}
}
pub struct XhtmlDisplayExpr {
pub open: Token![<],
pub expr: XhtmlDisplay,
pub close: Token![>],
}
impl XhtmlDisplayExpr {
pub fn span(&self) -> Span {
self.open.span.join(self.close.span).unwrap_or(self.open.span)
}
}
impl Parse for XhtmlDisplayExpr {
fn parse(input: ParseStream) -> Result<Self> {
let open: Token![<] = input.parse()?;
let _: Token![?] = input.parse()?;
let _: Token![>] = input.parse()?;
let xhtml: Xhtml = input.parse()?;
let expr = XhtmlDisplay::X(xhtml);
let _: Token![<] = input.parse()?;
let _: Token![/] = input.parse()?;
let _: Token![?] = input.parse()?;
let close: Token![>] = input.parse()?;
Ok(XhtmlDisplayExpr {
open: open,
expr: expr,
close: close,
})
}
}
impl ToTokens for XhtmlDisplayExpr {
fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
self.expr.to_tokens(tokens);
}
}