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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use cssparser::Parser;
use std::collections::HashMap;
use string_cache::{Atom, Namespace};
use parser::ParserContext;
#[deriving(Clone)]
pub struct NamespaceMap {
pub default: Option<Namespace>,
pub prefix_map: HashMap<String, Namespace>,
}
impl NamespaceMap {
pub fn new() -> NamespaceMap {
NamespaceMap { default: None, prefix_map: HashMap::new() }
}
}
pub fn parse_namespace_rule(context: &mut ParserContext, input: &mut Parser)
-> Result<(Option<String>, Namespace), ()> {
let prefix = input.try(|input| input.expect_ident()).ok().map(|p| p.into_owned());
let url = try!(input.expect_url_or_string());
try!(input.expect_exhausted());
let namespace = Namespace(Atom::from_slice(url.as_slice()));
let is_duplicate = match prefix {
Some(ref prefix) => {
context.namespaces.prefix_map.insert(prefix.clone(), namespace.clone()).is_some()
}
None => {
let has_default = context.namespaces.default.is_some();
if !has_default {
context.namespaces.default = Some(namespace.clone());
}
has_default
}
};
if is_duplicate {
Err(()) // "Duplicate @namespace rule"
} else {
Ok((prefix, namespace))
}
}
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