1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

/* 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 https://mozilla.org/MPL/2.0/. */

use dom_struct::dom_struct;
use html5ever::{local_name, namespace_url, ns, LocalName, Prefix};
use js::rust::HandleObject;
use servo_url::ServoUrl;

use crate::dom::attr::Attr;
use crate::dom::bindings::codegen::Bindings::HTMLBaseElementBinding::HTMLBaseElementMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::DOMString;
use crate::dom::document::Document;
use crate::dom::element::{AttributeMutation, Element};
use crate::dom::htmlelement::HTMLElement;
use crate::dom::node::{document_from_node, BindContext, Node, UnbindContext};
use crate::dom::virtualmethods::VirtualMethods;
use crate::script_runtime::CanGc;

#[dom_struct]
pub struct HTMLBaseElement {
    htmlelement: HTMLElement,
}

impl HTMLBaseElement {
    fn new_inherited(
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> HTMLBaseElement {
        HTMLBaseElement {
            htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
        }
    }

    #[allow(crown::unrooted_must_root)]
    pub fn new(
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
        proto: Option<HandleObject>,
        can_gc: CanGc,
    ) -> DomRoot<HTMLBaseElement> {
        Node::reflect_node_with_proto(
            Box::new(HTMLBaseElement::new_inherited(local_name, prefix, document)),
            document,
            proto,
            can_gc,
        )
    }

    /// <https://html.spec.whatwg.org/multipage/#frozen-base-url>
    pub fn frozen_base_url(&self) -> ServoUrl {
        let href = self
            .upcast::<Element>()
            .get_attribute(&ns!(), &local_name!("href"))
            .expect(
                "The frozen base url is only defined for base elements \
                 that have a base url.",
            );
        let document = document_from_node(self);
        let base = document.fallback_base_url();
        let parsed = base.join(&href.value());
        parsed.unwrap_or(base)
    }

    /// Update the cached base element in response to binding or unbinding from
    /// a tree.
    pub fn bind_unbind(&self, tree_in_doc: bool) {
        if !tree_in_doc || self.upcast::<Node>().containing_shadow_root().is_some() {
            return;
        }

        if self.upcast::<Element>().has_attribute(&local_name!("href")) {
            let document = document_from_node(self);
            document.refresh_base_element();
        }
    }
}

impl HTMLBaseElementMethods<crate::DomTypeHolder> for HTMLBaseElement {
    // https://html.spec.whatwg.org/multipage/#dom-base-href
    fn Href(&self) -> DOMString {
        // Step 1.
        let document = document_from_node(self);

        // Step 2.
        let attr = self
            .upcast::<Element>()
            .get_attribute(&ns!(), &local_name!("href"));
        let value = attr.as_ref().map(|attr| attr.value());
        let url = value.as_ref().map_or("", |value| &**value);

        // Step 3.
        let url_record = document.fallback_base_url().join(url);

        match url_record {
            Err(_) => {
                // Step 4.
                url.into()
            },
            Ok(url_record) => {
                // Step 5.
                url_record.into_string().into()
            },
        }
    }

    // https://html.spec.whatwg.org/multipage/#dom-base-href
    make_setter!(SetHref, "href");
}

impl VirtualMethods for HTMLBaseElement {
    fn super_type(&self) -> Option<&dyn VirtualMethods> {
        Some(self.upcast::<HTMLElement>() as &dyn VirtualMethods)
    }

    fn attribute_mutated(&self, attr: &Attr, mutation: AttributeMutation) {
        self.super_type().unwrap().attribute_mutated(attr, mutation);
        if *attr.local_name() == local_name!("href") {
            document_from_node(self).refresh_base_element();
        }
    }

    fn bind_to_tree(&self, context: &BindContext) {
        self.super_type().unwrap().bind_to_tree(context);
        self.bind_unbind(context.tree_in_doc);
    }

    fn unbind_from_tree(&self, context: &UnbindContext) {
        self.super_type().unwrap().unbind_from_tree(context);
        self.bind_unbind(context.tree_in_doc);
    }
}