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use quote::{quote_spanned, ToTokens};
use proc_macro2::{Span, Literal};
use syn::parse::{Parse, ParseStream, Result, Error};
use syn::{Ident, Token, Expr, LitStr, braced};
use syn::token::{Brace};
use crate::xtext::{XtextAttr,Xtext};
use crate::core::TokenAsLiteral;
pub enum XtextAttrKey {
S(String),
G(Expr,String)
}
pub struct XtextTag {
pub tag: String,
pub attrs: Vec<(XtextAttrKey,Option<XtextAttr>)>,
pub inner: Xtext,
pub outer_span: Span,
pub inner_span_start: Span,
pub inner_span_end: Span,
}
impl ToTokens for XtextTag {
fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
let open_tag = Literal::string(&format!("<{}", self.tag));
(quote_spanned!{self.outer_span=>
stream.push_str(#open_tag);
}).to_tokens(tokens);
for (k,v) in self.attrs.iter() {
match (k,v) {
(XtextAttrKey::S(k),None) => {
let l = Literal::string(&format!(" {}", k));
(quote_spanned!{self.outer_span=>
stream.push_str(#l);
}).to_tokens(tokens);
}, (XtextAttrKey::S(k),Some(XtextAttr::S(s))) => {
let l = Literal::string(&format!(" {}={}", k, s));
(quote_spanned!{self.outer_span=>
stream.push_str(#l);
}).to_tokens(tokens);
}, (XtextAttrKey::S(k),Some(XtextAttr::F(f))) => {
let l = Literal::string(&format!(" {}=", k));
(quote_spanned!{self.outer_span=>
stream.push_str(#l);
stream.push_str("\"");
stream.push_str(&{
let mut stream = String::new();
#f
stream.replace("\"", "\\\"")
});
stream.push_str("\"");
}).to_tokens(tokens);
}, (XtextAttrKey::S(k),Some(XtextAttr::E(e))) => {
let l = Literal::string(&format!(" {}=", k));
(quote_spanned!{self.outer_span=>
stream.push_str(#l);
stream.push_str("\"");
stream.push_str(&{
let mut stream = String::new();
#e
stream.replace("\"", "\\\"")
});
stream.push_str("\"");
}).to_tokens(tokens);
}, (XtextAttrKey::G(g,k),None) => {
let l = Literal::string(&format!(" {}", k));
(quote_spanned!{self.outer_span=>
if #g { stream.push_str(#l); }
}).to_tokens(tokens);
}, (XtextAttrKey::G(g,k),Some(XtextAttr::S(s))) => {
let l = Literal::string(&format!(" {}={}", k, s));
(quote_spanned!{self.outer_span=>
if #g { stream.push_str(#l); }
}).to_tokens(tokens);
}, (XtextAttrKey::G(g,k),Some(XtextAttr::F(f))) => {
let l = Literal::string(&format!(" {}=", k));
(quote_spanned!{self.outer_span=>
if #g {
stream.push_str(#l);
stream.push_str("\"");
stream.push_str(&{
let mut stream = String::new();
#f
stream.replace("\"", "\\\"")
});
stream.push_str("\"");
}
}).to_tokens(tokens);
}, (XtextAttrKey::G(g,k),Some(XtextAttr::E(e))) => {
let l = Literal::string(&format!(" {}=", k));
(quote_spanned!{self.outer_span=>
if #g {
stream.push_str(#l);
stream.push_str("\"");
stream.push_str(&{
let mut stream = String::new();
#e
stream.replace("\"", "\\\"")
});
stream.push_str("\"");
}
}).to_tokens(tokens);
}
}
}
let self_closing = vec!["area","base","br","embed","hr","iframe","img",
"input","link","meta","param","source","track"];
if self.inner.crumbs.len()==0 && self_closing.iter().any(|s| (&self.tag)==s) {
let l = Literal::string("/>");
(quote_spanned!{self.outer_span=>
stream.push_str(#l);
}).to_tokens(tokens);
} else {
let l = Literal::string(">");
(quote_spanned!{self.outer_span=>
stream.push_str(#l);
}).to_tokens(tokens);
self.inner.to_tokens(tokens);
let l = Literal::string(&format!("</{}>", self.tag));
(quote_spanned!{self.outer_span=>
stream.push_str(#l);
}).to_tokens(tokens);
}
}
}
impl Parse for XtextTag {
fn parse(input: ParseStream) -> Result<Self> {
let l1: Token![<] = input.parse()?;
let t: Ident = input.parse()?;
let mut attrs: Vec<(XtextAttrKey,Option<XtextAttr>)> = Vec::new();
while input.peek(Ident) ||
input.peek(LitStr) ||
input.peek(Token![as]) ||
input.peek(Token![break]) ||
input.peek(Token![const]) ||
input.peek(Token![continue]) ||
input.peek(Token![crate]) ||
input.peek(Token![else]) ||
input.peek(Token![enum]) ||
input.peek(Token![extern]) ||
input.peek(Token![fn]) ||
input.peek(Token![for]) ||
input.peek(Token![if]) ||
input.peek(Token![impl]) ||
input.peek(Token![in]) ||
input.peek(Token![let]) ||
input.peek(Token![loop]) ||
input.peek(Token![match]) ||
input.peek(Token![mod]) ||
input.peek(Token![move]) ||
input.peek(Token![mut]) ||
input.peek(Token![pub]) ||
input.peek(Token![ref]) ||
input.peek(Token![return]) ||
input.peek(Token![self]) ||
input.peek(Token![Self]) ||
input.peek(Token![static]) ||
input.peek(Token![struct]) ||
input.peek(Token![super]) ||
input.peek(Token![trait]) ||
input.peek(Token![type]) ||
input.peek(Token![unsafe]) ||
input.peek(Token![use]) ||
input.peek(Token![where]) ||
input.peek(Token![while]) ||
input.peek(Brace) {
if input.peek(Brace) {
let content1;
let content2;
let _brace1: Brace = braced!(content1 in input);
let _brace2: Brace = braced!(content2 in content1);
let _if: Token![if] = content2.parse()?;
let expr: Expr = content2.parse()?;
let content3;
let content4;
let _brace3: Brace = braced!(content3 in content2);
let _brace4: Brace = braced!(content4 in content3);
let key = if content4.peek(LitStr) { let s:LitStr = content4.parse()?; s.value()
} else { let key: Ident = content4.parse()?; key.to_string() };
let v = if content4.peek(Token![=]) {
let _eq: Token![=] = content4.parse()?;
let attr_expr: XtextAttr = XtextAttr::parse(&content4, key.clone())?;
Some(attr_expr)
} else { None };
attrs.push(( XtextAttrKey::G(expr,key), v ));
} else {
let t: TokenAsLiteral = input.parse()?;
let key = t.token_literal.clone();
let v = if input.peek(Token![=]) {
let _eq: Token![=] = input.parse()?;
let attr_expr: XtextAttr = XtextAttr::parse(input, key.clone())?;
Some(attr_expr)
} else { None };
attrs.push(( XtextAttrKey::S(key), v ));
}
}
if input.peek(Token![/]) {
let r1: Token![/] = input.parse()?;
let r2: Token![>] = input.parse()?;
Ok(XtextTag {
tag: t.to_string(),
attrs: attrs,
inner: Xtext { crumbs: vec!() },
outer_span: l1.span.join(r2.span).unwrap_or(l1.span),
inner_span_start: r1.span.clone(),
inner_span_end: r2.span.clone(),
})
} else {
let l2: Token![>] = input.parse()?;
let inner: Xtext = input.parse()?;
let r1: Token![<] = input.parse()?;
let _r2: Token![/] = input.parse()?;
let t2: Ident = input.parse()?;
if t.to_string() != t2.to_string() {
let msg = format!("Expected </{}> found </{}>", t, t2);
let r = Error::new(t2.span(), msg);
return Err(r)
}
let r3: Token![>] = input.parse()?;
Ok(XtextTag {
tag: t.to_string(),
attrs: attrs,
inner: inner,
outer_span: l1.span.join(r3.span).unwrap_or(l1.span),
inner_span_start: l2.span.clone(),
inner_span_end: r1.span.clone(),
})
}
}
}