C++ (Cpp) JSValue::toStringOrNull示例

示例#1

文件： RegExpConstructor.cpp 项目： caiolima/webkit

inline RegExpFlags toFlags(ExecState* exec, JSValue flags)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    if (flags.isUndefined())
        return NoFlags;
    JSString* flagsString = flags.toStringOrNull(exec);
    ASSERT(!!scope.exception() == !flagsString);
    if (UNLIKELY(!flagsString))
        return InvalidFlags;

    RegExpFlags result = regExpFlags(flagsString->value(exec));
    RETURN_IF_EXCEPTION(scope, InvalidFlags);
    if (result == InvalidFlags)
        throwSyntaxError(exec, scope, ASCIILiteral("Invalid flags supplied to RegExp constructor."));
    return result;
}