Method construct_tree

core/src/renderer/html/parser.rs:202–726

https://html.spec.whatwg.org/multipage/parsing.html#tree-construction

(&mut self)

    /// https://html.spec.whatwg.org/multipage/parsing.html#tree-construction
    pub fn construct_tree(&mut self) -> Rc<RefCell<Window>> {
        let mut token = self.t.next();

        while token.is_some() {
            match self.mode {
                // https://html.spec.whatwg.org/multipage/parsing.html#the-initial-insertion-mode
                InsertionMode::Initial => {
                    // Ignore <!doctype html>.
                    // <!doctype html> is generated as a Char token.
                    if let Some(HtmlToken::Char(_)) = token {
                        token = self.t.next();
                        continue;
                    }

                    self.mode = InsertionMode::BeforeHtml;
                    continue;
                }

                // https://html.spec.whatwg.org/multipage/parsing.html#the-before-html-insertion-mode
                InsertionMode::BeforeHtml => {
                    match token {
                        Some(HtmlToken::Char(c)) => {
                            if c == ' ' || c == '\n' {
                                token = self.t.next();
                                continue;
                            }
                        }
                        Some(HtmlToken::StartTag {
                            ref tag,
                            self_closing: _,
                            ref attributes,
                        }) => {
                            // A start tag whose tag name is "html"
                            // Create an element for the token in the HTML namespace, with the Document
                            // as the intended parent. Append it to the Document object. Put this
                            // element in the stack of open elements.
                            if tag == "html" {
                                self.insert_element(tag, attributes.to_vec());
                                self.mode = InsertionMode::BeforeHead;
                                token = self.t.next();
                                continue;
                            }
                        }
                        Some(HtmlToken::EndTag { ref tag }) => {
                            // Any other end tag
                            // Parse error. Ignore the token.
                            if tag != "head" || tag != "body" || tag != "html" || tag != "br" {
                                // Ignore the token.
                                token = self.t.next();
                                continue;
                            }
                        }
                        Some(HtmlToken::Eof) | None => {
                            return self.window.clone();
                        }
                    }
                    self.insert_element("html", Vec::new());
                    self.mode = InsertionMode::BeforeHead;