vendor/html5ever/src/tree_builder/tag_sets.rs

// Copyright 2014-2017 The html5ever Project Developers. See the
// COPYRIGHT file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Various sets of HTML tag names, and macros for declaring them.

use ExpandedName;

macro_rules! declare_tag_set_impl ( ($param:ident, $b:ident, $supr:ident, $($tag:tt)+) => (
    match $param {
        $( expanded_name!(html $tag) => $b, )+
        p => $supr(p),
    }
));

macro_rules! declare_tag_set_body (
    ($param:ident = [$supr:ident] - $($tag:tt)+)
        => ( declare_tag_set_impl!($param, false, $supr, $($tag)+) );

    ($param:ident = [$supr:ident] + $($tag:tt)+)
        => ( declare_tag_set_impl!($param, true, $supr, $($tag)+) );

    ($param:ident = $($tag:tt)+)
        => ( declare_tag_set_impl!($param, true, empty_set, $($tag)+) );
);

macro_rules! declare_tag_set (
    (pub $name:ident = $($toks:tt)+) => (
        pub fn $name(p: ::ExpandedName) -> bool {
            declare_tag_set_body!(p = $($toks)+)
        }
    );

    ($name:ident = $($toks:tt)+) => (
        fn $name(p: ::ExpandedName) -> bool {
            declare_tag_set_body!(p = $($toks)+)
        }
    );
);

#[inline(always)] pub fn empty_set(_: ExpandedName) -> bool { false }
#[inline(always)] pub fn full_set(_: ExpandedName) -> bool { true }

declare_tag_set!(pub html_default_scope =
    "applet" "caption" "html" "table" "td" "th" "marquee" "object" "template");

#[inline(always)] pub fn default_scope(name: ExpandedName) -> bool {
    html_default_scope(name) ||
    mathml_text_integration_point(name) ||
    svg_html_integration_point(name)
}

declare_tag_set!(pub list_item_scope = [default_scope] + "ol" "ul");
declare_tag_set!(pub button_scope = [default_scope] + "button");
declare_tag_set!(pub table_scope = "html" "table" "template");
declare_tag_set!(pub select_scope = [full_set] - "optgroup" "option");

declare_tag_set!(pub table_body_context = "tbody" "tfoot" "thead" "template" "html");
declare_tag_set!(pub table_row_context = "tr" "template" "html");
declare_tag_set!(pub td_th = "td" "th");

declare_tag_set!(pub cursory_implied_end =
    "dd" "dt" "li" "option" "optgroup" "p" "rb" "rp" "rt" "rtc");

declare_tag_set!(pub thorough_implied_end = [cursory_implied_end]
    + "caption" "colgroup" "tbody" "td" "tfoot" "th" "thead" "tr");

declare_tag_set!(pub heading_tag = "h1" "h2" "h3" "h4" "h5" "h6");

declare_tag_set!(pub special_tag =
    "address" "applet" "area" "article" "aside" "base" "basefont" "bgsound" "blockquote" "body"
    "br" "button" "caption" "center" "col" "colgroup" "dd" "details" "dir" "div" "dl" "dt" "embed"
    "fieldset" "figcaption" "figure" "footer" "form" "frame" "frameset" "h1" "h2" "h3" "h4" "h5"
    "h6" "head" "header" "hgroup" "hr" "html" "iframe" "img" "input" "isindex" "li" "link"
    "listing" "main" "marquee" "menu" "meta" "nav" "noembed" "noframes" "noscript"
    "object" "ol" "p" "param" "plaintext" "pre" "script" "section" "select" "source" "style"
    "summary" "table" "tbody" "td" "template" "textarea" "tfoot" "th" "thead" "title" "tr" "track"
    "ul" "wbr" "xmp");
//§ END

pub fn mathml_text_integration_point(p: ExpandedName) -> bool {
    matches!(p,
        expanded_name!(mathml "mi") |
        expanded_name!(mathml "mo") |
        expanded_name!(mathml "mn") |
        expanded_name!(mathml "ms") |
        expanded_name!(mathml "mtext"))
}

/// https://html.spec.whatwg.org/multipage/#html-integration-point
pub fn svg_html_integration_point(p: ExpandedName) -> bool {
    // annotation-xml are handle in another place
    matches!(p,
        expanded_name!(svg "foreignObject") |
        expanded_name!(svg "desc") |
        expanded_name!(svg "title"))
}