C++ String::reverseFind方法代码示例

static WTF::String urlSuitableForTestResult(const WTF::String& uriString)
{
    if (uriString.isEmpty() || !uriString.startsWith("file://"))
        return uriString;

    const size_t index = uriString.reverseFind('/');
    return (index == WTF::notFound) ? uriString : uriString.substring(index + 1);
}

const string WebResponse::resolveMimeType(const string& url, const string& old_mime)
{
    // Use "text/html" as a default (matching the behaviour of the Apache
    // HTTP stack -- see guessMimeType() in LoadListener.java).
    string mimeType = old_mime.length() ? old_mime : "text/html";
    // Try to guess a better MIME type from the URL. We call
    // getMIMETypeForExtension rather than getMIMETypeForPath because the
    // latter defaults to "application/octet-stream" on failure.
    WebCore::KURL kurl(WebCore::ParsedURLString, url.c_str());
    WTF::String path = kurl.path();
    size_t extensionPos = path.reverseFind('.');
    if (extensionPos != WTF::notFound) {
        // We found a file extension.
        path.remove(0, extensionPos + 1);
        // TODO: Should use content-disposition instead of url if it is there
        WTF::String mime = WebCore::MIMETypeRegistry::getMIMETypeForExtension(path);
        if (!mime.isEmpty()) {
            // Great, we found a MIME type.
            mimeType = std::string(mime.utf8().data(), mime.length());
        }
    }
    return mimeType;
}

void WebHistoryItem::updateHistoryItem(WebCore::HistoryItem* item) {
    // Do not want to update during inflation.
    if (!m_active)
        return;
    WebHistoryItem* webItem = this;
    // Now we need to update the top-most WebHistoryItem based on the top-most
    // HistoryItem.
    if (m_parent) {
        webItem = m_parent.get();
        if (webItem->hasOneRef()) {
            // if the parent only has one ref, it is from this WebHistoryItem.
            // This means that the matching WebCore::HistoryItem has been freed.
            // This can happen during clear().
            ALOGW("Can't updateHistoryItem as the top HistoryItem is gone");
            return;
        }
        while (webItem->parent())
            webItem = webItem->parent();
        item = webItem->historyItem();
        if (!item) {
            // If a HistoryItem only exists for page cache, it is possible that
            // the parent HistoryItem destroyed before the child HistoryItem. If
            // it happens, skip updating.
            ALOGW("Can't updateHistoryItem as the top HistoryItem is gone");
            return;
        }
    }
    JNIEnv* env = JSC::Bindings::getJNIEnv();
    if (!env)
        return;

    MutexLocker locker(webItem->m_lock);

    // TODO: Figure out if we can't just use item->urlString() instead...
    const WTF::String urlString = WebFrame::convertIDNToUnicode(item->url());
    webItem->m_url = urlString.threadsafeCopy();
    const WTF::String originalUrlString = WebFrame::convertIDNToUnicode(item->originalURL());
    webItem->m_originalUrl = originalUrlString.threadsafeCopy();
    const WTF::String& titleString = item->title();
    webItem->m_title = titleString.threadsafeCopy();

    // Try to get the favicon from the history item. For some pages like Grand
    // Prix, there are history items with anchors. If the icon fails for the
    // item, try to get the icon using the url without the ref.
    jobject favicon = NULL;
    WTF::String url = item->urlString();
    if (item->url().hasFragmentIdentifier()) {
        int refIndex = url.reverseFind('#');
        url = url.substring(0, refIndex);
    }
    // FIXME: This method should not be used from outside WebCore and will be removed.
    // http://trac.webkit.org/changeset/81484
    WebCore::Image* icon = WebCore::iconDatabase().synchronousIconForPageURL(url, WebCore::IntSize(16, 16));
    delete webItem->m_favicon;
    webItem->m_favicon = webcoreImageToSkBitmap(icon);
    if (webItem->m_faviconCached) {
        env->DeleteGlobalRef(webItem->m_faviconCached);
        webItem->m_faviconCached = 0;
    }

    webItem->m_data.clear();
    WebHistory::Flatten(env, webItem->m_data, item);
    if (webItem->m_dataCached) {
        env->DeleteGlobalRef(webItem->m_dataCached);
        webItem->m_dataCached = 0;
    }
}

void WebHistoryItem::updateHistoryItem(WebCore::HistoryItem* item) {
    // Do not want to update during inflation.
    if (!m_active)
        return;
    WebHistoryItem* webItem = this;
    // Now we need to update the top-most WebHistoryItem based on the top-most
    // HistoryItem.
    if (m_parent) {
        webItem = m_parent.get();
        if (webItem->hasOneRef()) {
            // if the parent only has one ref, it is from this WebHistoryItem.
            // This means that the matching WebCore::HistoryItem has been freed.
            // This can happen during clear().
            LOGW("Can't updateHistoryItem as the top HistoryItem is gone");
            return;
        }
        while (webItem->parent())
            webItem = webItem->parent();
        item = webItem->historyItem();
        if (!item) {
            // If a HistoryItem only exists for page cache, it is possible that
            // the parent HistoryItem destroyed before the child HistoryItem. If
            // it happens, skip updating.
            LOGW("Can't updateHistoryItem as the top HistoryItem is gone");
            return;
        }
    }
    JNIEnv* env = JSC::Bindings::getJNIEnv();
    if (!env)
        return;

    // Don't do anything if the item has been gc'd already
    AutoJObject realItem = getRealObject(env, webItem->m_object);
    if (!realItem.get())
        return;

    const WTF::String urlString = WebFrame::convertIDNToUnicode(item->url());
    jstring urlStr = NULL;
    if (!urlString.isNull())
        urlStr = wtfStringToJstring(env, urlString);
    const WTF::String originalUrlString = WebFrame::convertIDNToUnicode(item->originalURL());
    jstring originalUrlStr = NULL;
    if (!originalUrlString.isNull())
        originalUrlStr = wtfStringToJstring(env, originalUrlString);
    const WTF::String& titleString = item->title();
    jstring titleStr = NULL;
    if (!titleString.isNull())
        titleStr = wtfStringToJstring(env, titleString);

    // Try to get the favicon from the history item. For some pages like Grand
    // Prix, there are history items with anchors. If the icon fails for the
    // item, try to get the icon using the url without the ref.
    jobject favicon = NULL;
    WTF::String url = item->urlString();
    if (item->url().hasFragmentIdentifier()) {
        int refIndex = url.reverseFind('#');
        url = url.substring(0, refIndex);
    }
    // FIXME: This method should not be used from outside WebCore and will be removed.
    // http://trac.webkit.org/changeset/81484
    WebCore::Image* icon = WebCore::iconDatabase().synchronousIconForPageURL(url, WebCore::IntSize(16, 16));

    if (icon)
        favicon = webcoreImageToJavaBitmap(env, icon);

    WTF::Vector<char> data;
    jbyteArray array = WebHistory::Flatten(env, data, item);
    env->CallVoidMethod(realItem.get(), gWebHistoryItem.mUpdate, urlStr,
            originalUrlStr, titleStr, favicon, array);
    env->DeleteLocalRef(urlStr);
    env->DeleteLocalRef(originalUrlStr);
    env->DeleteLocalRef(titleStr);
    if (favicon)
        env->DeleteLocalRef(favicon);
    env->DeleteLocalRef(array);
}