script: Move HTML DOM interfaces to script/dom/html/ (#39046)

See #38901.

Testing: Refactor
Fixes: Partially #38901

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

components/script/dom/html/htmlfontelement.rs

@@ -0,0 +1,224 @@
+/* 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 cssparser::match_ignore_ascii_case;
+use dom_struct::dom_struct;
+use html5ever::{LocalName, Prefix, local_name, ns};
+use js::rust::HandleObject;
+use style::attr::AttrValue;
+use style::color::AbsoluteColor;
+use style::str::{HTML_SPACE_CHARACTERS, read_numbers};
+use style::values::computed::font::{
+    FamilyName, FontFamilyNameSyntax, GenericFontFamily, SingleFontFamily,
+};
+use stylo_atoms::Atom;
+
+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::html::htmlelement::HTMLElement;
+use crate::dom::node::Node;
+use crate::dom::virtualmethods::VirtualMethods;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) 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),
+        }
+    }
+
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    pub(crate) fn new(
+        local_name: LocalName,
+        prefix: Option<Prefix>,
+        document: &Document,
+        proto: Option<HandleObject>,
+        can_gc: CanGc,
+    ) -> DomRoot<HTMLFontElement> {
+        Node::reflect_node_with_proto(
+            Box::new(HTMLFontElement::new_inherited(local_name, prefix, document)),
+            document,
+            proto,
+            can_gc,
+        )
+    }
+
+    pub(crate) fn parse_face_attribute(face_value: Atom) -> Vec<SingleFontFamily> {
+        face_value
+            .split(',')
+            .map(|string| Self::parse_single_face_value_from_string(string.trim()))
+            .collect()
+    }
+
+    fn parse_single_face_value_from_string(string: &str) -> SingleFontFamily {
+        match_ignore_ascii_case! { string,
+            "serif" => return SingleFontFamily::Generic(GenericFontFamily::Serif),
+            "sans-serif" => return SingleFontFamily::Generic(GenericFontFamily::SansSerif),
+            "cursive" => return SingleFontFamily::Generic(GenericFontFamily::Cursive),
+            "fantasy" => return SingleFontFamily::Generic(GenericFontFamily::Fantasy),
+            "monospace" => return SingleFontFamily::Generic(GenericFontFamily::Monospace),
+            "system-ui" => return SingleFontFamily::Generic(GenericFontFamily::SystemUi),
+            _ => {}
+        }
+
+        let name = string.to_owned().replace(['\'', '"'], "");
+        let syntax = if name == string {
+            FontFamilyNameSyntax::Identifiers
+        } else {
+            FontFamilyNameSyntax::Quoted
+        };
+
+        SingleFontFamily::FamilyName(FamilyName {
+            name: name.into(),
+            syntax,
+        })
+    }
+}
+
+impl HTMLFontElementMethods<crate::DomTypeHolder> 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, can_gc: CanGc) {
+        let element = self.upcast::<Element>();
+        element.set_attribute(&local_name!("size"), parse_size(&value), can_gc);
+    }
+}
+
+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") ||
+            attr.local_name() == &local_name!("size") ||
+            attr.local_name() == &local_name!("face")
+        {
+            return true;
+        }
+
+        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(crate) trait HTMLFontElementLayoutHelpers {
+    fn get_color(self) -> Option<AbsoluteColor>;
+    fn get_face(self) -> Option<Atom>;
+    fn get_size(self) -> Option<u32>;
+}
+
+impl HTMLFontElementLayoutHelpers for LayoutDom<'_, HTMLFontElement> {
+    fn get_color(self) -> Option<AbsoluteColor> {
+        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,
+        ParseMode::RelativeMinus => value = 3 - value,
+        ParseMode::Absolute => (),
+    }
+
+    // Steps 10, 11, 12
+    AttrValue::UInt(original_input.into(), value as u32)
+}