C++ WMLPageState::getVariable方法代码示例

void WMLSelectElement::calculateDefaultOptionIndices()
{
    WMLPageState* pageState = wmlPageStateForDocument(document());
    if (!pageState)
        return;

    String variable;

    // Spec: If the 'iname' attribute is specified and names a variable that is set,
    // then the default option index is the validated value of that variable. 
    String iname = this->iname();
    if (!iname.isEmpty()) {
        variable = pageState->getVariable(iname);
        if (!variable.isEmpty())
            m_defaultOptionIndices = parseIndexValueString(variable);
    }

    // Spec: If the default option index is empty and the 'ivalue' attribute is specified,
    // then the default option index is the validated attribute value.
    String ivalue = this->ivalue();
    if (m_defaultOptionIndices.isEmpty() && !ivalue.isEmpty())
        m_defaultOptionIndices = parseIndexValueString(ivalue);

    // Spec: If the default option index is empty, and the 'name' attribute is specified
    // and the 'name' ttribute names a variable that is set, then for each value in the 'name'
    // variable that is present as a value in the select's option elements, the index of the
    // first option element containing that value is added to the default index if that
    // index has not been previously added. 
    String name = this->name();
    if (m_defaultOptionIndices.isEmpty() && !name.isEmpty()) {
        variable = pageState->getVariable(name);
        if (!variable.isEmpty())
            m_defaultOptionIndices = valueStringToOptionIndices(variable);
    }

    String value = parseValueSubstitutingVariableReferences(getAttribute(HTMLNames::valueAttr));

    // Spec: If the default option index is empty and the 'value' attribute is specified then
    // for each  value in the 'value' attribute that is present as a value in the select's
    // option elements, the index of the first option element containing that value is added
    // to the default index if that index has not been previously added. 
    if (m_defaultOptionIndices.isEmpty() && !value.isEmpty())
        m_defaultOptionIndices = valueStringToOptionIndices(value);

    // Spec: If the default option index is empty and the select is a multi-choice, then the
    // default option index is set to zero. If the select is single-choice, then the default
    // option index is set to one.
    if (m_defaultOptionIndices.isEmpty())
        m_defaultOptionIndices.append((unsigned) !m_data.multiple());
}

void WMLInputElement::initialize()
{
    String nameVariable = formControlName();
    String variableValue;
    WMLPageState* pageSate = wmlPageStateForDocument(document()); 
    ASSERT(pageSate);
    if (!nameVariable.isEmpty())
        variableValue = pageSate->getVariable(nameVariable);

    if (variableValue.isEmpty() || !isConformedToInputMask(variableValue)) {
        String val = value();
        if (isConformedToInputMask(val))
            variableValue = val;
        else
            variableValue = "";
 
        pageSate->storeVariable(nameVariable, variableValue);
    }
    setValue(variableValue);
 
    if (!hasAttribute(WMLNames::emptyokAttr)) {
        if (m_formatMask.isEmpty() || 
            // check if the format codes is just "*f"
           (m_formatMask.length() == 2 && m_formatMask[0] == '*' && formatCodes().find(m_formatMask[1]) != notFound))
            m_isEmptyOk = true;
    }
}

String substituteVariableReferences(const String& reference, Document* document, WMLVariableEscapingMode escapeMode)
{
    ASSERT(document);

    if (reference.isEmpty())
        return reference;

    WMLPageState* pageState = wmlPageStateForDocument(document);
    if (!pageState)
        return reference;

    bool isValid = true; 
    String remainingInput = reference;
    String result;

    while (!remainingInput.isEmpty()) {
        ASSERT(isValid);

        int start = remainingInput.find("$");
        if (start == -1) {
            // Consume all remaining characters, as there's nothing more to substitute
            result += remainingInput;
            break;
        }

        // Consume all characters until the variable reference beginning
        result += remainingInput.left(start);
        remainingInput.remove(0, start);

        // Transform adjacent dollar signs into a single dollar sign as string literal
        if (remainingInput[1] == '$') {
            result += "$";
            remainingInput.remove(0, 2);
            continue;
        }

        String variableName;
        String conversionMode;

        if (remainingInput[1] == '(') {
            int referenceEndPosition = remainingInput.find(")");
            if (referenceEndPosition == -1) {
                isValid = false;
                break;
            }

            variableName = remainingInput.substring(2, referenceEndPosition - 2);
            remainingInput.remove(0, referenceEndPosition + 1);

            // Determine variable conversion mode string
            int pos = variableName.find(':');
            if (pos != -1) {
                conversionMode = variableName.substring(pos + 1, variableName.length() - (pos + 1));
                variableName = variableName.left(pos);
            }
        } else {
            int length = remainingInput.length();
            int referenceEndPosition = 1;

            for (; referenceEndPosition < length; ++referenceEndPosition) {
                if (!isValidVariableNameCharacter(remainingInput[referenceEndPosition]))
                    break;
            }

            variableName = remainingInput.substring(1, referenceEndPosition - 1);
            remainingInput.remove(0, referenceEndPosition);
        }

        isValid = isValidVariableName(variableName);
        if (!isValid)
            break;

        ASSERT(!variableName.isEmpty());

        String variableValue = pageState->getVariable(variableName);
        if (variableValue.isEmpty())
            continue;

        if (containsVariableReference(variableValue, isValid)) {
            if (!isValid)
                break;

            variableValue = substituteVariableReferences(variableValue, document, escapeMode);
            continue;
        }

        if (!conversionMode.isEmpty()) {
            // Override default escape mode, if desired
            WMLVariableEscapingMode specifiedEscapeMode = WMLVariableEscapingNone; 
            if ((isValid = isValidVariableEscapingModeString(conversionMode, specifiedEscapeMode)))
                escapeMode = specifiedEscapeMode;

            if (!isValid)
                break;
        }

        switch (escapeMode) {
        case WMLVariableEscapingNone:
            break;
        case WMLVariableEscapingEscape:
//.........这里部分代码省略.........