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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::RGBA;
use dom::bindings::codegen::Bindings::HTMLFontElementBinding;
use dom::bindings::codegen::Bindings::HTMLFontElementBinding::HTMLFontElementMethods;
use dom::bindings::inheritance::Castable;
use dom::bindings::js::{LayoutJS, Root};
use dom::bindings::str::DOMString;
use dom::document::Document;
use dom::element::{Element, RawLayoutElementHelpers};
use dom::htmlelement::HTMLElement;
use dom::node::Node;
use dom::virtualmethods::VirtualMethods;
use html5ever_atoms::LocalName;
use servo_atoms::Atom;
use style::attr::AttrValue;
use style::str::{HTML_SPACE_CHARACTERS, read_numbers};
use style::values::specified;
#[dom_struct]
pub struct HTMLFontElement {
htmlelement: HTMLElement,
}
impl HTMLFontElement {
fn new_inherited(local_name: LocalName, prefix: Option<DOMString>, document: &Document) -> HTMLFontElement {
HTMLFontElement {
htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
}
}
#[allow(unrooted_must_root)]
pub fn new(local_name: LocalName,
prefix: Option<DOMString>,
document: &Document) -> Root<HTMLFontElement> {
Node::reflect_node(box HTMLFontElement::new_inherited(local_name, prefix, document),
document,
HTMLFontElementBinding::Wrap)
}
}
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>();
let length = parse_length(&value);
element.set_attribute(&local_name!("size"), AttrValue::Length(value.into(), length));
}
}
impl VirtualMethods for HTMLFontElement {
fn super_type(&self) -> Option<&VirtualMethods> {
Some(self.upcast::<HTMLElement>() as &VirtualMethods)
}
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") => {
let length = parse_length(&value);
AttrValue::Length(value.into(), length)
},
_ => 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<specified::Length>;
}
impl HTMLFontElementLayoutHelpers for LayoutJS<HTMLFontElement> {
#[allow(unsafe_code)]
fn get_color(&self) -> Option<RGBA> {
unsafe {
(*self.upcast::<Element>().unsafe_get())
.get_attr_for_layout(&ns!(), &local_name!("color"))
.and_then(AttrValue::as_color)
.cloned()
}
}
#[allow(unsafe_code)]
fn get_face(&self) -> Option<Atom> {
unsafe {
(*self.upcast::<Element>().unsafe_get())
.get_attr_for_layout(&ns!(), &local_name!("face"))
.map(AttrValue::as_atom)
.cloned()
}
}
#[allow(unsafe_code)]
fn get_size(&self) -> Option<specified::Length> {
unsafe {
(*self.upcast::<Element>().unsafe_get())
.get_attr_for_layout(&ns!(), &local_name!("size"))
.and_then(AttrValue::as_length)
.cloned()
}
}
}
/// https://html.spec.whatwg.org/multipage/#rules-for-parsing-a-legacy-font-size
pub fn parse_legacy_font_size(mut input: &str) -> Option<&'static str> {
// 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 None,
// 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), _) => v,
(None, _) => return None,
};
// Step 9
match parse_mode {
ParseMode::RelativePlus => value = 3 + value,
ParseMode::RelativeMinus => value = 3 - value,
ParseMode::Absolute => (),
}
// Steps 10, 11, 12
Some(match value {
n if n >= 7 => "xxx-large",
6 => "xx-large",
5 => "x-large",
4 => "large",
3 => "medium",
2 => "small",
n if n <= 1 => "x-small",
_ => unreachable!(),
})
}
fn parse_length(value: &str) -> Option<specified::Length> {
parse_legacy_font_size(&value).and_then(|parsed| specified::Length::from_str(&parsed))
}
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