C++ HTMLFormControlElement类代码示例

void HTMLFormCollection::updateNameCache() const
{
    if (info()->hasNameCache)
        return;

    HashSet<AtomicStringImpl*> foundInputElements;

    HTMLFormElement* f = static_cast<HTMLFormElement*>(base());

    for (unsigned i = 0; i < f->formElements.size(); ++i) {
        HTMLFormControlElement* e = f->formElements[i];
        if (e->isEnumeratable()) {
            const AtomicString& idAttrVal = e->getAttribute(idAttr);
            const AtomicString& nameAttrVal = e->getAttribute(nameAttr);
            if (!idAttrVal.isEmpty()) {
                // add to id cache
                Vector<Element*>* idVector = info()->idCache.get(idAttrVal.impl());
                if (!idVector) {
                    idVector = new Vector<Element*>;
                    info()->idCache.add(idAttrVal.impl(), idVector);
                }
                idVector->append(e);
                foundInputElements.add(idAttrVal.impl());
            }
            if (!nameAttrVal.isEmpty() && idAttrVal != nameAttrVal) {
                // add to name cache
                Vector<Element*>* nameVector = info()->nameCache.get(nameAttrVal.impl());
                if (!nameVector) {
                    nameVector = new Vector<Element*>;
                    info()->nameCache.add(nameAttrVal.impl(), nameVector);
                }
                nameVector->append(e);
                foundInputElements.add(nameAttrVal.impl());
            }
        }
    }

    for (unsigned i = 0; i < f->imgElements.size(); ++i) {
        HTMLImageElement* e = f->imgElements[i];
        const AtomicString& idAttrVal = e->getAttribute(idAttr);
        const AtomicString& nameAttrVal = e->getAttribute(nameAttr);
        if (!idAttrVal.isEmpty() && !foundInputElements.contains(idAttrVal.impl())) {
            // add to id cache
            Vector<Element*>* idVector = info()->idCache.get(idAttrVal.impl());
            if (!idVector) {
                idVector = new Vector<Element*>;
                info()->idCache.add(idAttrVal.impl(), idVector);
            }
            idVector->append(e);
        }
        if (!nameAttrVal.isEmpty() && idAttrVal != nameAttrVal && !foundInputElements.contains(nameAttrVal.impl())) {
            // add to name cache
            Vector<Element*>* nameVector = info()->nameCache.get(nameAttrVal.impl());
            if (!nameVector) {
                nameVector = new Vector<Element*>;
                info()->nameCache.add(nameAttrVal.impl(), nameVector);
            }
            nameVector->append(e);
        }
    }

    info()->hasNameCache = true;
}

void ChromeClientImpl::didChangeValueInTextField(HTMLFormControlElement& element)
{
    WebLocalFrameImpl* webframe = WebLocalFrameImpl::fromFrame(element.document().frame());
    if (webframe->autofillClient())
        webframe->autofillClient()->textFieldDidChange(WebFormControlElement(&element));
}

PassRefPtr<FormSubmission> FormSubmission::create(HTMLFormElement* form, const Attributes& attributes, PassRefPtr<Event> event, bool lockHistory, FormSubmissionTrigger trigger)
{
    ASSERT(form);

    HTMLFormControlElement* submitButton = 0;
    if (event && event->target() && event->target()->toNode())
        submitButton = static_cast<HTMLFormControlElement*>(event->target()->toNode());

    FormSubmission::Attributes copiedAttributes;
    copiedAttributes.copyFrom(attributes);
    if (submitButton) {
        String attributeValue;
        if (!(attributeValue = submitButton->getAttribute(formactionAttr)).isNull())
            copiedAttributes.parseAction(attributeValue);
        if (!(attributeValue = submitButton->getAttribute(formenctypeAttr)).isNull())
            copiedAttributes.updateEncodingType(attributeValue);
        if (!(attributeValue = submitButton->getAttribute(formmethodAttr)).isNull())
            copiedAttributes.updateMethodType(attributeValue);
        if (!(attributeValue = submitButton->getAttribute(formtargetAttr)).isNull())
            copiedAttributes.setTarget(attributeValue);
    }
    
    Document* document = form->document();
    KURL actionURL = document->completeURL(copiedAttributes.action().isEmpty() ? document->url().string() : copiedAttributes.action());
    bool isMailtoForm = actionURL.protocolIs("mailto");
    bool isMultiPartForm = false;
    String encodingType = copiedAttributes.encodingType();

    if (copiedAttributes.method() == PostMethod) {
        isMultiPartForm = copiedAttributes.isMultiPartForm();
        if (isMultiPartForm && isMailtoForm) {
            encodingType = "application/x-www-form-urlencoded";
            isMultiPartForm = false;
        }
    }

    TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : FormDataBuilder::encodingFromAcceptCharset(copiedAttributes.acceptCharset(), document);
    RefPtr<DOMFormData> domFormData = DOMFormData::create(dataEncoding.encodingForFormSubmission());
    Vector<pair<String, String> > formValues;

    for (unsigned i = 0; i < form->associatedElements().size(); ++i) {
        FormAssociatedElement* control = form->associatedElements()[i];
        HTMLElement* element = toHTMLElement(control);
        if (!element->disabled())
            control->appendFormData(*domFormData, isMultiPartForm);
        if (element->hasLocalName(inputTag)) {
            HTMLInputElement* input = static_cast<HTMLInputElement*>(control);
            if (input->isTextField()) {
                formValues.append(pair<String, String>(input->name().string(), input->value()));
                if (input->isSearchField())
                    input->addSearchResult();
            }
        }
    }

    RefPtr<FormData> formData;
    String boundary;

    if (isMultiPartForm) {
        formData = FormData::createMultiPart(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), document);
        boundary = formData->boundary().data();
    } else {
        formData = FormData::create(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), attributes.method() == GetMethod ? FormData::FormURLEncoded : FormData::parseEncodingType(encodingType));
        if (copiedAttributes.method() == PostMethod && isMailtoForm) {
            // Convert the form data into a string that we put into the URL.
            appendMailtoPostFormDataToURL(actionURL, *formData, encodingType);
            formData = FormData::create();
        }
    }

    formData->setIdentifier(generateFormDataIdentifier());
    String targetOrBaseTarget = copiedAttributes.target().isEmpty() ? document->baseTarget() : copiedAttributes.target();
    RefPtr<FormState> formState = FormState::create(form, formValues, document->frame(), trigger);
    return adoptRef(new FormSubmission(copiedAttributes.method(), actionURL, targetOrBaseTarget, encodingType, formState.release(), formData.release(), boundary, lockHistory, event));
}

void HTMLFormElement::submit(Event* event, bool activateSubmitButton, bool lockHistory, bool lockBackForwardList)
{
    FrameView* view = document()->view();
    Frame* frame = document()->frame();
    if (!view || !frame)
        return;

    if (m_insubmit) {
        m_doingsubmit = true;
        return;
    }

    m_insubmit = true;

    HTMLFormControlElement* firstSuccessfulSubmitButton = 0;
    bool needButtonActivation = activateSubmitButton; // do we need to activate a submit button?
    
    Vector<pair<String, String> > formValues;

    for (unsigned i = 0; i < formElements.size(); ++i) {
        HTMLFormControlElement* control = formElements[i];
        if (control->hasLocalName(inputTag)) {
            HTMLInputElement* input = static_cast<HTMLInputElement*>(control);
            if (input->isTextField()) {
                formValues.append(pair<String, String>(input->name(), input->value()));
                if (input->isSearchField())
                    input->addSearchResult();
            }
        }
        if (needButtonActivation) {
            if (control->isActivatedSubmit())
                needButtonActivation = false;
            else if (firstSuccessfulSubmitButton == 0 && control->isSuccessfulSubmitButton())
                firstSuccessfulSubmitButton = control;
        }
    }

    RefPtr<FormState> formState = FormState::create(this, formValues, frame);

    if (needButtonActivation && firstSuccessfulSubmitButton)
        firstSuccessfulSubmitButton->setActivatedSubmit(true);
    
    if (m_url.isEmpty())
        m_url = document()->url().string();

    if (m_formDataBuilder.isPostMethod()) {
        if (m_formDataBuilder.isMultiPartForm() && isMailtoForm()) {
            setEnctype("application/x-www-form-urlencoded");
            ASSERT(!m_formDataBuilder.isMultiPartForm());
        }

        if (!m_formDataBuilder.isMultiPartForm()) {
            RefPtr<FormData> data = createFormData(CString());

            if (isMailtoForm()) {
                // Convert the form data into a string that we put into the URL.
                KURL url = document()->completeURL(m_url);
                transferMailtoPostFormDataToURL(data, url, m_formDataBuilder.encodingType());
                m_url = url.string();
            }

            frame->loader()->submitForm("POST", m_url, data.release(), m_target, m_formDataBuilder.encodingType(), String(), lockHistory, lockBackForwardList, event, formState.release());
        } else {
            Vector<char> boundary = m_formDataBuilder.generateUniqueBoundaryString();
            frame->loader()->submitForm("POST", m_url, createFormData(boundary.data()), m_target, m_formDataBuilder.encodingType(), boundary.data(), lockHistory, lockBackForwardList, event, formState.release());
        }
    } else {
        m_formDataBuilder.setIsMultiPartForm(false);
        frame->loader()->submitForm("GET", m_url, createFormData(CString()), m_target, String(), String(), lockHistory, lockBackForwardList, event, formState.release());
    }

    if (needButtonActivation && firstSuccessfulSubmitButton)
        firstSuccessfulSubmitButton->setActivatedSubmit(false);
    
    m_doingsubmit = m_insubmit = false;
}

PassRefPtr<FormData> HTMLFormElement::createFormData(const CString& boundary)
{
    Vector<char> encodedData;
    TextEncoding encoding = dataEncoding().encodingForFormSubmission();

    RefPtr<FormData> result = FormData::create();

    for (unsigned i = 0; i < formElements.size(); ++i) {
        HTMLFormControlElement* control = formElements[i];
        FormDataList list(encoding);

        if (!control->disabled() && control->appendFormData(list, m_formDataBuilder.isMultiPartForm())) {
            size_t formDataListSize = list.list().size();
            ASSERT(formDataListSize % 2 == 0);
            for (size_t j = 0; j < formDataListSize; j += 2) {
                const FormDataList::Item& key = list.list()[j];
                const FormDataList::Item& value = list.list()[j + 1];
                if (!m_formDataBuilder.isMultiPartForm()) {
                    // Omit the name "isindex" if it's the first form data element.
                    // FIXME: Why is this a good rule? Is this obsolete now?
                    if (encodedData.isEmpty() && key.data() == "isindex")
                        FormDataBuilder::encodeStringAsFormData(encodedData, value.data());
                    else
                        m_formDataBuilder.addKeyValuePairAsFormData(encodedData, key.data(), value.data());
                } else {
                    Vector<char> header;
                    m_formDataBuilder.beginMultiPartHeader(header, boundary, key.data());

                    bool shouldGenerateFile = false;
                    // if the current type is FILE, then we also need to include the filename
                    if (value.file()) {
                        const String& path = value.file()->path();
                        String fileName = value.file()->fileName();

                        // Let the application specify a filename if it's going to generate a replacement file for the upload.
                        if (!path.isEmpty()) {
                            if (Page* page = document()->page()) {
                                String generatedFileName;
                                shouldGenerateFile = page->chrome()->client()->shouldReplaceWithGeneratedFileForUpload(path, generatedFileName);
                                if (shouldGenerateFile)
                                    fileName = generatedFileName;
                            }
                        }

                        // We have to include the filename=".." part in the header, even if the filename is empty
                        m_formDataBuilder.addFilenameToMultiPartHeader(header, encoding, fileName);

                        if (!fileName.isEmpty()) {
                            // FIXME: The MIMETypeRegistry function's name makes it sound like it takes a path,
                            // not just a basename. But filename is not the path. But note that it's not safe to
                            // just use path instead since in the generated-file case it will not reflect the
                            // MIME type of the generated file.
                            String mimeType = MIMETypeRegistry::getMIMETypeForPath(fileName);
                            if (!mimeType.isEmpty())
                                m_formDataBuilder.addContentTypeToMultiPartHeader(header, mimeType.latin1());
                        }
                    }

                    m_formDataBuilder.finishMultiPartHeader(header);

                    // Append body
                    result->appendData(header.data(), header.size());
                    if (size_t dataSize = value.data().length())
                        result->appendData(value.data().data(), dataSize);
                    else if (value.file() && !value.file()->path().isEmpty())
                        result->appendFile(value.file()->path(), shouldGenerateFile);

                    result->appendData("\r\n", 2);
                }
            }
        }
    }

    if (m_formDataBuilder.isMultiPartForm())
        m_formDataBuilder.addBoundaryToMultiPartHeader(encodedData, boundary, true);

    result->appendData(encodedData.data(), encodedData.size());

    result->setIdentifier(generateFormDataIdentifier());
    return result;
}

// https://html.spec.whatwg.org/multipage/forms.html#processing-model-3
AutofillData AutofillData::createFromHTMLFormControlElement(const HTMLFormControlElement& element)
{
    static NeverDestroyed<AtomicString> on("on", AtomicString::ConstructFromLiteral);
    static NeverDestroyed<AtomicString> off("off", AtomicString::ConstructFromLiteral);

    // Label: Default
    // 26. Let the element's IDL-exposed autofill value be the empty string, and its autofill hint set and autofill scope be empty.
    // 27. If the element's autocomplete attribute is wearing the autofill anchor mantle, then let the element's autofill field name be the empty string and abort these steps.
    // 28. Let form be the element's form owner, if any, or null otherwise.
    // 29. If form is not null and form's autocomplete attribute is in the off state, then let the element's autofill field name be "off". Otherwise, let the element's autofill field name be "on".
    auto defaultLabel = [&] () -> AutofillData {
        if (element.autofillMantle() == AutofillMantle::Anchor)
            return { emptyString(), emptyString() };
        
        auto form = element.form();
        if (form && form->autocomplete() == off)
            return { off, emptyString() };
        return { on, emptyString() };
    };


    const AtomicString& attributeValue = element.attributeWithoutSynchronization(HTMLNames::autocompleteAttr);

    // 1. If the element has no autocomplete attribute, then jump to the step labeled default.
    if (attributeValue == nullAtom)
        return defaultLabel();

    // 2. Let tokens be the result of splitting the attribute's value on spaces.
    SpaceSplitString tokens(attributeValue, true);

    // 3. If tokens is empty, then jump to the step labeled default.
    if (tokens.isEmpty())
        return defaultLabel();
    
    // 4. Let index be the index of the last token in tokens
    unsigned index = tokens.size() - 1;

    // 5. If the indexth token in tokens is not an ASCII case-insensitive match for one of the
    // tokens given in the first column of the following table, or if the number of tokens in
    // tokens is greater than the maximum number given in the cell in the second column of that
    // token's row, then jump to the step labeled default. Otherwise, let field be the string given
    // in the cell of the first column of the matching row, and let category be the value of the
    // cell in the third column of that same row.
    auto& map = fieldNameMap();

    auto it = map.find(tokens[index]);
    if (it == map.end())
        return defaultLabel();
    
    auto category = it->value.category;

    if (tokens.size() > maxTokensForAutofillFieldCategory(category))
        return defaultLabel();

    const auto& field = tokens[index];

    // 6. If category is Off or Automatic but the element's autocomplete attribute is wearing the
    // autofill anchor mantle, then jump to the step labeled default.
    auto mantle = element.autofillMantle();
    if ((category == AutofillCategory::Off || category == AutofillCategory::Automatic) && mantle == AutofillMantle::Anchor)
        return defaultLabel();

    // 7. If category is Off, let the element's autofill field name be the string "off", let its
    // autofill hint set be empty, and let its IDL-exposed autofill value be the string "off".
    // Then, abort these steps.
    if (category == AutofillCategory::Off)
        return { off, off.get().string() };

    // 8. If category is Automatic, let the element's autofill field name be the string "on",
    // let its autofill hint set be empty, and let its IDL-exposed autofill value be the string
    // "on". Then, abort these steps.
    if (category == AutofillCategory::Automatic)
        return { on, on.get().string() };

    // 9. Let scope tokens be an empty list.
    // 10. Let hint tokens be an empty set.

    // NOTE: We are ignoring these steps as we don't currently make use of scope tokens or hint tokens anywhere.

    // 11. Let IDL value have the same value as field.
    String idlValue = field;

    // 12, If the indexth token in tokens is the first entry, then skip to the step labeled done.
    if (index == 0)
        return { field, idlValue };

    // 13. Decrement index by one
    index--;

    // 14. If category is Contact and the indexth token in tokens is an ASCII case-insensitive match
    // for one of the strings in the following list, then run the substeps that follow:
    const auto& contactToken = tokens[index];
    if (category == AutofillCategory::Contact && isContactToken(contactToken)) {
        // 1. Let contact be the matching string from the list above.
        const auto& contact = contactToken;

        // 2. Insert contact at the start of scope tokens.
        // 3. Add contact to hint tokens.

//.........这里部分代码省略.........

void HTMLFormElement::submit(Event* event, bool activateSubmitButton, bool lockHistory, bool lockBackForwardList)
{
    FrameView* view = document()->view();
    Frame* frame = document()->frame();
    if (!view || !frame)
        return;

    if (m_insubmit) {
        m_doingsubmit = true;
        return;
    }

    m_insubmit = true;

    HTMLFormControlElement* firstSuccessfulSubmitButton = 0;
    bool needButtonActivation = activateSubmitButton; // do we need to activate a submit button?
    
    frame->loader()->clearRecordedFormValues();
    frame->loader()->setFormAboutToBeSubmitted(this);
    for (unsigned i = 0; i < formElements.size(); ++i) {
        HTMLFormControlElement* control = formElements[i];
        if (control->hasLocalName(inputTag)) {
            HTMLInputElement* input = static_cast<HTMLInputElement*>(control);
            if (input->isTextField()) {
                frame->loader()->recordFormValue(input->name(), input->value());
                if (input->isSearchField())
                    input->addSearchResult();
            }
        }
        if (needButtonActivation) {
            if (control->isActivatedSubmit())
                needButtonActivation = false;
            else if (firstSuccessfulSubmitButton == 0 && control->isSuccessfulSubmitButton())
                firstSuccessfulSubmitButton = control;
        }
    }

    if (needButtonActivation && firstSuccessfulSubmitButton)
        firstSuccessfulSubmitButton->setActivatedSubmit(true);
    
    if (m_url.isEmpty())
        m_url = document()->url().string();

    if (m_formDataBuilder.isPostMethod()) {
        if (m_formDataBuilder.isMultiPartForm() && isMailtoForm()) {
            setEnctype("application/x-www-form-urlencoded");
            ASSERT(!m_formDataBuilder.isMultiPartForm());
        }

        if (!m_formDataBuilder.isMultiPartForm()) {
            RefPtr<FormData> data = createFormData(CString());
            if (isMailtoForm()) {
                String body = data->flattenToString();
                if (equalIgnoringCase(m_formDataBuilder.encodingType(), "text/plain")) {
                    // Convention seems to be to decode, and s/&/\r\n/. Also, spaces are encoded as %20.
                    body = decodeURLEscapeSequences(body.replace('&', "\r\n").replace('+', ' ') + "\r\n");
                }
                Vector<char> bodyData;
                bodyData.append("body=", 5);
                FormDataBuilder::encodeStringAsFormData(bodyData, body.utf8());
                data = FormData::create(String(bodyData.data(), bodyData.size()).replace('+', "%20").latin1());
            }
            frame->loader()->submitForm("POST", m_url, data, m_target, m_formDataBuilder.encodingType(), String(), event, lockHistory, lockBackForwardList);
        } else {
            Vector<char> boundary = m_formDataBuilder.generateUniqueBoundaryString();
            frame->loader()->submitForm("POST", m_url, createFormData(boundary.data()), m_target, m_formDataBuilder.encodingType(), boundary.data(), event, lockHistory, lockBackForwardList);
        }
    } else {
        m_formDataBuilder.setIsMultiPartForm(false);
        frame->loader()->submitForm("GET", m_url, createFormData(CString()), m_target, String(), String(), event, lockHistory, lockBackForwardList);
    }

    if (needButtonActivation && firstSuccessfulSubmitButton)
        firstSuccessfulSubmitButton->setActivatedSubmit(false);
    
    m_doingsubmit = m_insubmit = false;
}

Ref<FormSubmission> FormSubmission::create(HTMLFormElement* form, const Attributes& attributes, PassRefPtr<Event> event, LockHistory lockHistory, FormSubmissionTrigger trigger)
{
    ASSERT(form);

    HTMLFormControlElement* submitButton = 0;
    if (event && event->target()) {
        for (Node* node = event->target()->toNode(); node; node = node->parentNode()) {
            if (is<HTMLFormControlElement>(*node)) {
                submitButton = downcast<HTMLFormControlElement>(node);
                break;
            }
        }
    }

    FormSubmission::Attributes copiedAttributes;
    copiedAttributes.copyFrom(attributes);
    if (submitButton) {
        AtomicString attributeValue;
        if (!(attributeValue = submitButton->fastGetAttribute(formactionAttr)).isNull())
            copiedAttributes.parseAction(attributeValue);
        if (!(attributeValue = submitButton->fastGetAttribute(formenctypeAttr)).isNull())
            copiedAttributes.updateEncodingType(attributeValue);
        if (!(attributeValue = submitButton->fastGetAttribute(formmethodAttr)).isNull())
            copiedAttributes.updateMethodType(attributeValue);
        if (!(attributeValue = submitButton->fastGetAttribute(formtargetAttr)).isNull())
            copiedAttributes.setTarget(attributeValue);
    }
    
    Document& document = form->document();
    URL actionURL = document.completeURL(copiedAttributes.action().isEmpty() ? document.url().string() : copiedAttributes.action());
    bool isMailtoForm = actionURL.protocolIs("mailto");
    bool isMultiPartForm = false;
    String encodingType = copiedAttributes.encodingType();

    if (copiedAttributes.method() == PostMethod) {
        isMultiPartForm = copiedAttributes.isMultiPartForm();
        if (isMultiPartForm && isMailtoForm) {
            encodingType = "application/x-www-form-urlencoded";
            isMultiPartForm = false;
        }
    }

    TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : encodingFromAcceptCharset(copiedAttributes.acceptCharset(), document);
    RefPtr<DOMFormData> domFormData = DOMFormData::create(dataEncoding.encodingForFormSubmission());
    Vector<std::pair<String, String>> formValues;

    bool containsPasswordData = false;
    for (unsigned i = 0; i < form->associatedElements().size(); ++i) {
        FormAssociatedElement& control = *form->associatedElements()[i];
        HTMLElement& element = control.asHTMLElement();
        if (!element.isDisabledFormControl())
            control.appendFormData(*domFormData, isMultiPartForm);
        if (is<HTMLInputElement>(element)) {
            HTMLInputElement& input = downcast<HTMLInputElement>(element);
            if (input.isTextField()) {
                formValues.append(std::pair<String, String>(input.name().string(), input.value()));
                input.addSearchResult();
            }
            if (input.isPasswordField() && !input.value().isEmpty())
                containsPasswordData = true;
        }
    }

    RefPtr<FormData> formData;
    String boundary;

    if (isMultiPartForm) {
        formData = FormData::createMultiPart(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), &document);
        boundary = formData->boundary().data();
    } else {
        formData = FormData::create(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), attributes.method() == GetMethod ? FormData::FormURLEncoded : FormData::parseEncodingType(encodingType));
        if (copiedAttributes.method() == PostMethod && isMailtoForm) {
            // Convert the form data into a string that we put into the URL.
            appendMailtoPostFormDataToURL(actionURL, *formData, encodingType);
            formData = FormData::create();
        }
    }

    formData->setIdentifier(generateFormDataIdentifier());
    formData->setContainsPasswordData(containsPasswordData);
    String targetOrBaseTarget = copiedAttributes.target().isEmpty() ? document.baseTarget() : copiedAttributes.target();
    RefPtr<FormState> formState = FormState::create(form, formValues, &document, trigger);
    return adoptRef(*new FormSubmission(copiedAttributes.method(), actionURL, targetOrBaseTarget, encodingType, formState.release(), formData.release(), boundary, lockHistory, event));
}