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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/* 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 crate::dom::attr::Attr;
use crate::dom::bindings::codegen::Bindings::HTMLFontElementBinding::HTMLFontElementMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::root::{DomRoot, LayoutDom};
use crate::dom::bindings::str::DOMString;
use crate::dom::document::Document;
use crate::dom::element::{Element, LayoutElementHelpers};
use crate::dom::htmlelement::HTMLElement;
use crate::dom::node::Node;
use crate::dom::virtualmethods::VirtualMethods;
use cssparser::RGBA;
use dom_struct::dom_struct;
use html5ever::{LocalName, Prefix};
use servo_atoms::Atom;
use style::attr::AttrValue;
use style::str::{read_numbers, HTML_SPACE_CHARACTERS};

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

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

    #[allow(unrooted_must_root)]
    pub fn new(
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> DomRoot<HTMLFontElement> {
        Node::reflect_node(
            Box::new(HTMLFontElement::new_inherited(local_name, prefix, document)),
            document,
        )
    }
}

impl HTMLFontElementMethods for HTMLFontElement {
    // https://html.spec.whatwg.org/multipage/#dom-font-color
    make_getter!(Color, "color");

    // https://html.spec.whatwg.org/multipage/#dom-font-color
    make_legacy_color_setter!(SetColor, "color");

    // https://html.spec.whatwg.org/multipage/#dom-font-face
    make_getter!(Face, "face");

    // https://html.spec.whatwg.org/multipage/#dom-font-face
    make_atomic_setter!(SetFace, "face");

    // https://html.spec.whatwg.org/multipage/#dom-font-size
    make_getter!(Size, "size");

    // https://html.spec.whatwg.org/multipage/#dom-font-size
    fn SetSize(&self, value: DOMString) {
        let element = self.upcast::<Element>();
        element.set_attribute(&local_name!("size"), parse_size(&value));
    }
}

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

    fn attribute_affects_presentational_hints(&self, attr: &Attr) -> bool {
        if attr.local_name() == &local_name!("color") {
            return true;
        }

        // FIXME: Should also return true for `size` and `face` changes!
        self.super_type()
            .unwrap()
            .attribute_affects_presentational_hints(attr)
    }

    fn parse_plain_attribute(&self, name: &LocalName, value: DOMString) -> AttrValue {
        match name {
            &local_name!("face") => AttrValue::from_atomic(value.into()),
            &local_name!("color") => AttrValue::from_legacy_color(value.into()),
            &local_name!("size") => parse_size(&value),
            _ => self
                .super_type()
                .unwrap()
                .parse_plain_attribute(name, value),
        }
    }
}

pub trait HTMLFontElementLayoutHelpers {
    fn get_color(self) -> Option<RGBA>;
    fn get_face(self) -> Option<Atom>;
    fn get_size(self) -> Option<u32>;
}

impl HTMLFontElementLayoutHelpers for LayoutDom<'_, HTMLFontElement> {
    fn get_color(self) -> Option<RGBA> {
        self.upcast::<Element>()
            .get_attr_for_layout(&ns!(), &local_name!("color"))
            .and_then(AttrValue::as_color)
            .cloned()
    }

    fn get_face(self) -> Option<Atom> {
        self.upcast::<Element>()
            .get_attr_for_layout(&ns!(), &local_name!("face"))
            .map(AttrValue::as_atom)
            .cloned()
    }

    fn get_size(self) -> Option<u32> {
        let size = self
            .upcast::<Element>()
            .get_attr_for_layout(&ns!(), &local_name!("size"));
        match size {
            Some(&AttrValue::UInt(_, s)) => Some(s),
            _ => None,
        }
    }
}

/// <https://html.spec.whatwg.org/multipage/#rules-for-parsing-a-legacy-font-size>
fn parse_size(mut input: &str) -> AttrValue {
    let original_input = input;
    // Steps 1 & 2 are not relevant

    // Step 3
    input = input.trim_matches(HTML_SPACE_CHARACTERS);

    enum ParseMode {
        RelativePlus,
        RelativeMinus,
        Absolute,
    }
    let mut input_chars = input.chars().peekable();
    let parse_mode = match input_chars.peek() {
        // Step 4
        None => return AttrValue::String(original_input.into()),

        // Step 5
        Some(&'+') => {
            let _ = input_chars.next(); // consume the '+'
            ParseMode::RelativePlus
        },
        Some(&'-') => {
            let _ = input_chars.next(); // consume the '-'
            ParseMode::RelativeMinus
        },
        Some(_) => ParseMode::Absolute,
    };

    // Steps 6, 7, 8
    let mut value = match read_numbers(input_chars) {
        (Some(v), _) if v >= 0 => v,
        _ => return AttrValue::String(original_input.into()),
    };

    // Step 9
    match parse_mode {
        ParseMode::RelativePlus => value = 3 + value,
        ParseMode::RelativeMinus => value = 3 - value,
        ParseMode::Absolute => (),
    }

    // Steps 10, 11, 12
    AttrValue::UInt(original_input.into(), value as u32)
}