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/*
* Copyright (C) 2024 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TextExtraction.h"
#include "ComposedTreeIterator.h"
#include "HTMLBodyElement.h"
#include "HTMLButtonElement.h"
#include "HTMLImageElement.h"
#include "HTMLInputElement.h"
#include "Page.h"
#include "RenderBox.h"
#include "RenderLayer.h"
#include "RenderLayerModelObject.h"
#include "RenderLayerScrollableArea.h"
#include "SimpleRange.h"
#include "Text.h"
#include "TextIterator.h"
namespace WebCore {
namespace TextExtraction {
static inline HashMap<Ref<Text>, String> collectText(ContainerNode& container)
{
HashMap<Ref<Text>, String> nodeToTextMap;
RefPtr<Text> lastTextNode;
StringBuilder textForLastTextNode;
for (TextIterator iterator { makeRangeSelectingNodeContents(container) }; !iterator.atEnd(); iterator.advance()) {
if (iterator.text().isEmpty())
continue;
RefPtr textNode = dynamicDowncast<Text>(iterator.node());
if (!textNode)
continue;
if (!lastTextNode)
lastTextNode = textNode;
if (lastTextNode == textNode) {
textForLastTextNode.append(iterator.text());
continue;
}
if (auto text = textForLastTextNode.toString().trim(isASCIIWhitespace<UChar>); !text.isEmpty())
nodeToTextMap.add(*lastTextNode, WTFMove(text));
textForLastTextNode.clear();
textForLastTextNode.append(iterator.text());
lastTextNode = textNode;
}
if (auto text = textForLastTextNode.toString().trim(isASCIIWhitespace<UChar>); lastTextNode && !text.isEmpty())
nodeToTextMap.add(*lastTextNode, WTFMove(text));
return nodeToTextMap;
}
static bool shouldIncludeChildren(const ItemData& data)
{
return WTF::switchOn(data,
[&](const TextItemData&) { return false; },
[&](const ScrollableItemData&) { return true; },
[&](const EditableItemData&) { return true; },
[&](const ImageItemData&) { return false; },
[&](const InteractiveItemData&) { return true; },
[&](ContainerType) { return true; }
);
}
static inline FloatRect rootViewBounds(Node& node)
{
auto view = node.document().protectedView();
if (UNLIKELY(!view))
return { };
if (!node.renderer())
return { };
return view->contentsToRootView(node.renderer()->absoluteBoundingBoxRect());
}
static inline std::optional<ItemData> extractItemData(Node& node, const HashMap<Ref<Text>, String>& extractedText)
{
CheckedPtr renderer = node.renderer();
if (!renderer)
return std::nullopt;
if (renderer->style().visibility() == Visibility::Hidden)
return std::nullopt;
if (RefPtr textNode = dynamicDowncast<Text>(node)) {
if (auto iterator = extractedText.find(*textNode); iterator != extractedText.end())
return { { TextItemData { iterator->value } } };
return std::nullopt;
}
RefPtr element = dynamicDowncast<Element>(node);
if (!element)
return std::nullopt;
if (!element->isInUserAgentShadowTree() && element->isRootEditableElement())
return { { EditableItemData { element == element->document().activeElement() } } };
if (RefPtr image = dynamicDowncast<HTMLImageElement>(element))
return { { ImageItemData { image->src().lastPathComponent().toString(), image->altText() } } };
if (RefPtr button = dynamicDowncast<HTMLButtonElement>(element))
return { { InteractiveItemData { !button->isDisabledFormControl() } } };
if (RefPtr input = dynamicDowncast<HTMLInputElement>(element)) {
if (input->isTextButton())
return { { InteractiveItemData { !input->isDisabledFormControl() } } };
if (input->isTextField())
return { { EditableItemData { input == input->document().activeElement() } } };
}
if (CheckedPtr box = dynamicDowncast<RenderBox>(node.renderer()); box && box->canBeScrolledAndHasScrollableArea()) {
if (auto layer = box->checkedLayer(); layer && layer->scrollableArea())
return { { ScrollableItemData { layer->scrollableArea()->totalContentsSize() } } };
}
if (element->hasTagName(HTMLNames::olTag) || element->hasTagName(HTMLNames::ulTag))
return { { ContainerType::List } };
if (element->hasTagName(HTMLNames::liTag))
return { { ContainerType::ListItem } };
if (element->hasTagName(HTMLNames::blockquoteTag))
return { { ContainerType::BlockQuote } };
if (element->hasTagName(HTMLNames::articleTag))
return { { ContainerType::Article } };
if (element->hasTagName(HTMLNames::sectionTag))
return { { ContainerType::Section } };
if (element->hasTagName(HTMLNames::navTag))
return { { ContainerType::Nav } };
if (element->isLink())
return { { ContainerType::Link } };
if (renderer->style().hasViewportConstrainedPosition())
return { { ContainerType::ViewportConstrained } };
return std::nullopt;
}
static inline void extractRecursive(Node& node, Item& parentItem, const HashMap<Ref<Text>, String>& extractedText, const std::optional<WebCore::FloatRect>& rectInRootView)
{
std::optional<Item> item;
if (auto itemData = extractItemData(node, extractedText)) {
auto nodeBoundsInRootView = rootViewBounds(node);
if (!rectInRootView || rectInRootView->intersects(nodeBoundsInRootView))
item = { { WTFMove(*itemData), WTFMove(nodeBoundsInRootView), { } } };
}
if (!item || shouldIncludeChildren(item->data)) {
if (RefPtr container = dynamicDowncast<ContainerNode>(node)) {
for (auto& child : composedTreeChildren(*container))
extractRecursive(child, item ? *item : parentItem, extractedText, rectInRootView);
}
}
if (item)
parentItem.children.append(WTFMove(*item));
}
Item extractItem(std::optional<WebCore::FloatRect>&& collectionRectInRootView, Page& page)
{
Item root { ContainerType::Root, { }, { } };
RefPtr mainFrame = dynamicDowncast<LocalFrame>(page.mainFrame());
if (!mainFrame) {
// FIXME: Propagate text extraction to RemoteFrames.
return root;
}
RefPtr mainDocument = mainFrame->document();
if (!mainDocument)
return root;
RefPtr bodyElement = mainDocument->body();
if (!bodyElement)
return root;
mainDocument->updateLayoutIgnorePendingStylesheets();
root.rectInRootView = rootViewBounds(*bodyElement);
extractRecursive(*bodyElement, root, collectText(*bodyElement), collectionRectInRootView);
return root;
}
} // namespace TextExtractor
} // namespace WebCore
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