C++ TextEncoding::isValid方法代码示例

WebSearchableFormData::WebSearchableFormData(const WebFormElement& form, const WebInputElement& selectedInputElement)
{
    RefPtr<HTMLFormElement> formElement = form.operator PassRefPtr<HTMLFormElement>();
    const Frame* frame = formElement->document()->frame();
    if (!frame)
        return;

    HTMLInputElement* inputElement = selectedInputElement.operator PassRefPtr<HTMLInputElement>().get();

    // Only consider forms that GET data.
    // Allow HTTPS only when an input element is provided. 
    if (equalIgnoringCase(formElement->getAttribute(methodAttr), "post") 
        || (!IsHTTPFormSubmit(formElement.get()) && !inputElement))
        return;

    Vector<char> encodedString;
    TextEncoding encoding;

    GetFormEncoding(formElement.get(), &encoding);
    if (!encoding.isValid()) {
        // Need a valid encoding to encode the form elements.
        // If the encoding isn't found webkit ends up replacing the params with
        // empty strings. So, we don't try to do anything here.
        return;
    } 

    // Look for a suitable search text field in the form when a 
    // selectedInputElement is not provided.
    if (!inputElement) {
        inputElement = findSuitableSearchInputElement(formElement.get());

        // Return if no suitable text element has been found.
        if (!inputElement)
            return;
    }

    HTMLFormControlElement* firstSubmitButton = GetButtonToActivate(formElement.get());
    if (firstSubmitButton) {
        // The form does not have an active submit button, make the first button
        // active. We need to do this, otherwise the URL will not contain the
        // name of the submit button.
        firstSubmitButton->setActivatedSubmit(true);
    }

    bool isValidSearchString = buildSearchString(formElement.get(), &encodedString, &encoding, inputElement);

    if (firstSubmitButton)
        firstSubmitButton->setActivatedSubmit(false);

    // Return if the search string is not valid. 
    if (!isValidSearchString)
        return;

    String action(formElement->action());
    KURL url(frame->loader()->completeURL(action.isNull() ? "" : action));
    RefPtr<FormData> formData = FormData::create(encodedString);
    url.setQuery(formData->flattenToString());
    m_url = url;
    m_encoding = String(encoding.name()); 
}

static bool isCharsetSpecifyingNode(const Node& node)
{
    if (!is<HTMLElement>(node))
        return false;

    const HTMLElement& element = downcast<HTMLElement>(node);
    if (!element.hasTagName(HTMLNames::metaTag))
        return false;
    HTMLMetaCharsetParser::AttributeList attributes;
    if (element.hasAttributes()) {
        for (const Attribute& attribute : element.attributesIterator()) {
            // FIXME: We should deal appropriately with the attribute if they have a namespace.
            attributes.append(std::make_pair(attribute.name().toString(), attribute.value().string()));
        }
    }
    TextEncoding textEncoding = HTMLMetaCharsetParser::encodingFromMetaAttributes(attributes);
    return textEncoding.isValid();
}

static bool isCharsetSpecifyingNode(Node* node)
{
    if (!node->isHTMLElement())
        return false;

    HTMLElement* element = toHTMLElement(node);
    if (!element->hasTagName(HTMLNames::metaTag))
        return false;
    HTMLMetaCharsetParser::AttributeList attributes;
    const NamedNodeMap* attributesMap = element->attributes(true);
    for (unsigned i = 0; i < attributesMap->length(); ++i) {
        Attribute* item = attributesMap->attributeItem(i);
        // FIXME: We should deal appropriately with the attribute if they have a namespace.
        attributes.append(make_pair(item->name().toString(), item->value().string()));
    }
    TextEncoding textEncoding = HTMLMetaCharsetParser::encodingFromMetaAttributes(attributes);
    return textEncoding.isValid();
}

void TextResourceDecoder::setEncoding(const TextEncoding& encoding, EncodingSource source)
{
    // In case the encoding didn't exist, we keep the old one (helps some sites specifying invalid encodings).
    if (!encoding.isValid())
        return;

    // When encoding comes from meta tag (i.e. it cannot be XML files sent via XHR),
    // treat x-user-defined as windows-1252 (bug 18270)
    if (source == EncodingFromMetaTag && strcasecmp(encoding.name(), "x-user-defined") == 0)
        m_encoding = "windows-1252";
    else if (source == EncodingFromMetaTag || source == EncodingFromXMLHeader || source == EncodingFromCSSCharset)        
        m_encoding = encoding.closestByteBasedEquivalent();
    else
        m_encoding = encoding;

    m_codec.clear();
    m_source = source;
}

static bool isCharsetSpecifyingNode(Node* node)
{
    if (!node->isHTMLElement())
        return false;

    HTMLElement* element = toHTMLElement(node);
    if (!element->hasTagName(HTMLNames::metaTag))
        return false;
    HTMLMetaCharsetParser::AttributeList attributes;
    if (element->hasAttributes()) {
        for (unsigned i = 0; i < element->attributeCount(); ++i) {
            const Attribute* attribute = element->attributeItem(i);
            // FIXME: We should deal appropriately with the attribute if they have a namespace.
            attributes.append(std::make_pair(attribute->name().toString(), attribute->value().string()));
        }
    }
    TextEncoding textEncoding = HTMLMetaCharsetParser::encodingFromMetaAttributes(attributes);
    return textEncoding.isValid();
}

const TextEncoding& UTF8Encoding()
{
    static TextEncoding globalUTF8Encoding("UTF-8");
    ASSERT(globalUTF8Encoding.isValid());
    return globalUTF8Encoding;
}