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Simplify code to find template path

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This commit is contained in:
Dirkjan Ochtman 2017-02-08 19:46:12 +01:00
parent 4e34adcbbe
commit 330e2ef471
1 changed files with 10 additions and 23 deletions
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33
askama_derive/src/lib.rs
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@ -4,32 +4,19 @@ extern crate syn;
use proc_macro::TokenStream;
fn get_path_from_attrs(attrs: &Vec<syn::Attribute>) -> String {
for attr in attrs {
if attr.name() == "template" {
match attr.value {
syn::MetaItem::List(_, ref inner) => {
match inner[0] {
syn::NestedMetaItem::MetaItem(ref item) => {
match item {
&syn::MetaItem::NameValue(ref key, ref val) => {
assert_eq!(key.as_ref(), "path");
match val {
&syn::Lit::Str(ref s, _) => { return s.clone(); },
_ => panic!("template path must be a string"),
}
},
_ => panic!("template annotation must contain key/value pair"),
}
},
_ => panic!("template annotation must contain item"),
}
},
_ => panic!("template annotation must be of List type"),
fn get_path_from_attrs(attrs: &[syn::Attribute]) -> String {
let attr = attrs.iter().find(|a| a.name() == "template").unwrap();
if let syn::MetaItem::List(_, ref inner) = attr.value {
if let syn::NestedMetaItem::MetaItem(ref item) = inner[0] {
if let &syn::MetaItem::NameValue(ref key, ref val) = item {
assert_eq!(key.as_ref(), "path");
if let &syn::Lit::Str(ref s, _) = val {
return s.clone();
}
}
}
}
panic!("template annotation not found");
panic!("template path not found in struct attributes");
}
#[proc_macro_derive(Template, attributes(template))]