/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "third_party/blink/renderer/core/html/link_rel_attribute.h"

#include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"

namespace blink {

LinkRelAttribute::LinkRelAttribute(const String& rel) : LinkRelAttribute() {
  if (rel.empty())
    return;
  // Per the HTML spec, the `rel` attribute is split on ASCII whitespace.
  // TODO(crbug.com/505286910): Consider making LinkRelAttribute a subclass of
  // RelList (DOMTokenList) to avoid duplicating whitespace splitting logic.
  Vector<String> list = SplitOnASCIIWhitespace(rel);
  for (const String& token : list) {
    String link_type = token.ToAsciiLower();
    if (link_type == "stylesheet") {
      is_style_sheet_ = true;
    } else if (link_type == "alternate") {
      is_alternate_ = true;
    } else if (link_type == "icon") {
      // This also allows "shortcut icon" since we just ignore the non-standard
      // "shortcut" token (in accordance with the spec).
      icon_type_ = mojom::blink::FaviconIconType::kFavicon;
    } else if (link_type == "prefetch") {
      is_link_prefetch_ = true;
    } else if (link_type == "dns-prefetch") {
      is_dns_prefetch_ = true;
    } else if (link_type == "preconnect") {
      is_preconnect_ = true;
    } else if (link_type == "preload") {
      is_link_preload_ = true;
    } else if (link_type == "prerender") {
      is_link_prerender_ = true;
    } else if (link_type == "next") {
      is_link_next_ = true;
    } else if (link_type == "apple-touch-icon") {
      icon_type_ = mojom::blink::FaviconIconType::kTouchIcon;
    } else if (link_type == "apple-touch-icon-precomposed") {
      icon_type_ = mojom::blink::FaviconIconType::kTouchPrecomposedIcon;
    } else if (link_type == "manifest") {
      is_manifest_ = true;
    } else if (link_type == "modulepreload") {
      is_module_preload_ = true;
    } else if (link_type == "serviceworker") {
      is_service_worker_ = true;
    } else if (link_type == "canonical") {
      is_canonical_ = true;
    } else if (link_type == "monetization") {
      is_monetization_ = true;
    } else if (link_type == "compression-dictionary") {
      is_compression_dictionary_ = true;
    } else if (link_type == "privacy-policy") {
      is_privacy_policy_ = true;
    } else if (link_type == "terms-of-service") {
      is_terms_of_service_ = true;
    } else if (link_type == "expect") {
      is_expect_ = true;
    } else if (link_type == "facilitated-payment") {
      is_facilitated_payment_ = true;
    } else if (RuntimeEnabledFeatures::DeclarativeSkeletonsEnabled() &&
               EqualIgnoringAsciiCase(link_type, "prefetch-skeleton")) {
      is_link_prefetch_skeleton_ = true;
    }

    // Adding or removing a value here whose processing model is web-visible
    // (e.g. if the value is listed as a "supported token" for `<link>`'s `rel`
    // attribute in HTML) also requires you to update the list of tokens in
    // RelList::SupportedTokensLink().
  }
}

}  // namespace blink