use proc_macro2::token_stream::IntoIter;
use proc_macro2::Delimiter;
use proc_macro2::TokenTree;
use std::collections::BTreeMap;
use syn::Attribute;
#[derive(Debug, PartialEq, Clone)]
pub struct YaSerdeAttribute {
pub attribute: bool,
pub default: Option<String>,
pub default_namespace: Option<String>,
pub flatten: bool,
pub namespaces: BTreeMap<String, String>,
pub prefix: Option<String>,
pub root: Option<String>,
pub rename: Option<String>,
pub skip_serializing_if: Option<String>,
pub text: bool,
}
fn get_value(iter: &mut IntoIter) -> Option<String> {
if let (Some(TokenTree::Punct(operator)), Some(TokenTree::Literal(value))) =
(iter.next(), iter.next())
{
if operator.as_char() == '=' {
Some(value.to_string().replace("\"", ""))
} else {
None
}
} else {
None
}
}
impl YaSerdeAttribute {
pub fn parse(attrs: &[Attribute]) -> YaSerdeAttribute {
let mut attribute = false;
let mut flatten = false;
let mut default = None;
let mut default_namespace = None;
let mut namespaces = BTreeMap::new();
let mut prefix = None;
let mut rename = None;
let mut root = None;
let mut skip_serializing_if = None;
let mut text = false;
for attr in attrs.iter() {
let mut attr_iter = attr.clone().tokens.into_iter();
if let Some(token) = attr_iter.next() {
if let TokenTree::Group(group) = token {
if group.delimiter() == Delimiter::Parenthesis {
let mut attr_iter = group.stream().into_iter();
while let Some(item) = attr_iter.next() {
if let TokenTree::Ident(ident) = item {
match ident.to_string().as_str() {
"attribute" => {
attribute = true;
}
"default" => {
default = get_value(&mut attr_iter);
}
"default_namespace" => {
default_namespace = get_value(&mut attr_iter);
}
"flatten" => {
flatten = true;
}
"namespace" => {
if let Some(namespace) = get_value(&mut attr_iter) {
let splitted: Vec<&str> = namespace.split(": ").collect();
if splitted.len() == 2 {
namespaces.insert(splitted[0].to_owned(), splitted[1].to_owned());
}
if splitted.len() == 1 {
namespaces.insert("".to_owned(), splitted[0].to_owned());
}
}
}
"prefix" => {
prefix = get_value(&mut attr_iter);
}
"rename" => {
rename = get_value(&mut attr_iter);
}
"root" => {
root = get_value(&mut attr_iter);
}
"skip_serializing_if" => {
skip_serializing_if = get_value(&mut attr_iter);
}
"text" => {
text = true;
}
_ => {}
}
}
}
}
}
}
}
YaSerdeAttribute {
attribute,
default,
default_namespace,
flatten,
namespaces,
prefix,
rename,
root,
skip_serializing_if,
text,
}
}
}
#[test]
fn parse_empty_attributes() {
let attributes = vec![];
let attrs = YaSerdeAttribute::parse(&attributes);
assert_eq!(
YaSerdeAttribute {
attribute: false,
default: None,
default_namespace: None,
flatten: false,
namespaces: BTreeMap::new(),
prefix: None,
root: None,
rename: None,
skip_serializing_if: None,
text: false,
},
attrs
);
}
#[test]
fn parse_attributes() {
use proc_macro2::{Span, TokenStream};
use std::str::FromStr;
use syn::punctuated::Punctuated;
use syn::token::Bracket;
use syn::token::Pound;
use syn::AttrStyle::Outer;
use syn::{Ident, Path, PathArguments, PathSegment};
let mut punctuated = Punctuated::new();
punctuated.push(PathSegment {
ident: Ident::new("yaserde", Span::call_site()),
arguments: PathArguments::None,
});
let attributes = vec![Attribute {
pound_token: Pound {
spans: [Span::call_site()],
},
style: Outer,
bracket_token: Bracket {
span: Span::call_site(),
},
path: Path {
leading_colon: None,
segments: punctuated,
},
tokens: TokenStream::from_str("(attribute)").unwrap(),
}];
let attrs = YaSerdeAttribute::parse(&attributes);
assert_eq!(
YaSerdeAttribute {
attribute: true,
default: None,
default_namespace: None,
flatten: false,
namespaces: BTreeMap::new(),
prefix: None,
root: None,
rename: None,
skip_serializing_if: None,
text: false,
},
attrs
);
}
#[test]
fn parse_attributes_with_values() {
use proc_macro2::{Span, TokenStream};
use std::str::FromStr;
use syn::punctuated::Punctuated;
use syn::token::Bracket;
use syn::token::Pound;
use syn::AttrStyle::Outer;
use syn::{Ident, Path, PathArguments, PathSegment};
let mut punctuated = Punctuated::new();
punctuated.push(PathSegment {
ident: Ident::new("yaserde", Span::call_site()),
arguments: PathArguments::None,
});
let attributes = vec![Attribute {
pound_token: Pound {
spans: [Span::call_site()],
},
style: Outer,
bracket_token: Bracket {
span: Span::call_site(),
},
path: Path {
leading_colon: None,
segments: punctuated,
},
tokens: TokenStream::from_str("(attribute, flatten, default_namespace=\"example\", namespace=\"example: http://example.org\")").unwrap(),
}];
let attrs = YaSerdeAttribute::parse(&attributes);
let mut namespaces = BTreeMap::new();
namespaces.insert("example".to_string(), "http://example.org".to_string());
assert_eq!(
YaSerdeAttribute {
attribute: true,
default: None,
default_namespace: Some("example".to_string()),
flatten: true,
namespaces,
prefix: None,
root: None,
rename: None,
skip_serializing_if: None,
text: false,
},
attrs
);
}