mirror of
https://github.com/servo/servo.git
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449aaec5c2
Previously, if the attribute was not parsed into a token list, and the tokens() method returned None, DOMTokenList#contains would silently return false. This issue was encountered in <https://github.com/servo/servo/pull/4076> and took quite some time to figure out.
102 lines
3.6 KiB
Rust
102 lines
3.6 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use dom::attr::{Attr, AttrHelpers};
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use dom::bindings::codegen::Bindings::DOMTokenListBinding;
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use dom::bindings::codegen::Bindings::DOMTokenListBinding::DOMTokenListMethods;
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use dom::bindings::error::{Fallible, InvalidCharacter, Syntax};
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use dom::bindings::global::Window;
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use dom::bindings::js::{JS, JSRef, Temporary, OptionalRootable};
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use dom::bindings::utils::{Reflector, Reflectable, reflect_dom_object};
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use dom::element::{Element, AttributeHandlers};
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use dom::node::window_from_node;
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use servo_util::str::{DOMString, HTML_SPACE_CHARACTERS};
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use string_cache::Atom;
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#[dom_struct]
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pub struct DOMTokenList {
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reflector_: Reflector,
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element: JS<Element>,
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local_name: Atom,
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}
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impl DOMTokenList {
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pub fn new_inherited(element: JSRef<Element>, local_name: Atom) -> DOMTokenList {
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DOMTokenList {
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reflector_: Reflector::new(),
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element: JS::from_rooted(element),
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local_name: local_name,
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}
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}
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pub fn new(element: JSRef<Element>, local_name: &Atom) -> Temporary<DOMTokenList> {
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let window = window_from_node(element).root();
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reflect_dom_object(box DOMTokenList::new_inherited(element, local_name.clone()),
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&Window(*window),
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DOMTokenListBinding::Wrap)
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}
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}
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impl Reflectable for DOMTokenList {
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fn reflector<'a>(&'a self) -> &'a Reflector {
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&self.reflector_
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}
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}
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trait PrivateDOMTokenListHelpers {
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fn attribute(self) -> Option<Temporary<Attr>>;
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fn check_token_exceptions<'a>(self, token: &'a str) -> Fallible<&'a str>;
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}
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impl<'a> PrivateDOMTokenListHelpers for JSRef<'a, DOMTokenList> {
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fn attribute(self) -> Option<Temporary<Attr>> {
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let element = self.element.root();
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element.get_attribute(ns!(""), &self.local_name)
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}
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fn check_token_exceptions<'a>(self, token: &'a str) -> Fallible<&'a str> {
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match token {
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"" => Err(Syntax),
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token if token.find(HTML_SPACE_CHARACTERS).is_some() => Err(InvalidCharacter),
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token => Ok(token)
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}
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}
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}
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// http://dom.spec.whatwg.org/#domtokenlist
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impl<'a> DOMTokenListMethods for JSRef<'a, DOMTokenList> {
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// http://dom.spec.whatwg.org/#dom-domtokenlist-length
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fn Length(self) -> u32 {
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self.attribute().root().map(|attr| {
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attr.value().tokens().map(|tokens| tokens.len()).unwrap_or(0)
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}).unwrap_or(0) as u32
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}
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// http://dom.spec.whatwg.org/#dom-domtokenlist-item
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fn Item(self, index: u32) -> Option<DOMString> {
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self.attribute().root().and_then(|attr| attr.value().tokens().and_then(|tokens| {
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tokens.get(index as uint).map(|token| token.as_slice().to_string())
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}))
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}
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fn IndexedGetter(self, index: u32, found: &mut bool) -> Option<DOMString> {
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let item = self.Item(index);
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*found = item.is_some();
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item
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}
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// http://dom.spec.whatwg.org/#dom-domtokenlist-contains
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fn Contains(self, token: DOMString) -> Fallible<bool> {
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self.check_token_exceptions(token.as_slice()).map(|slice| {
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self.attribute().root().map(|attr| {
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let value = attr.value();
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let tokens = value.tokens()
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.expect("Should have parsed this attribute");
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let atom = Atom::from_slice(slice);
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tokens.iter().any(|token| *token == atom)
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}).unwrap_or(false)
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})
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}
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}
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