Source/WebCore/dom/FragmentDirectiveRangeFinder.cpp

/*
 * Copyright (C) 2022 Apple Inc. All rights reserved.
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#include "config.h"
#include "FragmentDirectiveRangeFinder.h"

#include "Chrome.h"
#include "ChromeClient.h"
#include "Document.h"
#include "Editor.h"
#include "FindOptions.h"
#include "SimpleRange.h"
#include "TextIterator.h"

namespace WebCore {
namespace FragmentDirectiveRangeFinder {

static SimpleRange collapseIfRootsDiffer(SimpleRange&& range)
{
    return &range.start.container->rootNode() == &range.end.container->rootNode()
        ? WTFMove(range) : SimpleRange { range.start, range.start };
}

static std::optional<SimpleRange> rangeOfString(const String& target, Document& document)
{
    if (target.isEmpty())
        return std::nullopt;

    auto searchRange = makeRangeSelectingNodeContents(document);
    
    FindOptions findOptions { DoNotRevealSelection };
    
    auto resultRange = collapseIfRootsDiffer(findPlainText(searchRange, target, findOptions));

    return resultRange.collapsed() ? std::nullopt : std::make_optional(resultRange);
}

const Vector<SimpleRange> rangesForFragments(Vector<ParsedTextDirective>& parsedTextDirectives, Document& document)
{
    Vector<SimpleRange> ranges;
    
    for (auto directive : parsedTextDirectives) {
        // FIXME: do full algorithm to find the exact text phrase, rather than just searching for the first place that the text is
        auto range = rangeOfString(directive.textStart, document);
        if (range && !range->collapsed())
            ranges.append(range.value());
    }
    
    return ranges;
}

}

} // WebCore