C++ VNode::SetupString方法代码示例

//
// StdParse::ParseStringVNode
//
// Parses a string VNode, NULL if error
//
VNode* StdParse::ParseStringVNode(TBuf *tBuf)
{
  // Allow empty strings
  Bool empty = FALSE;

  // Store string delimiter
  char delim[2];

  // Accept the start of the string literal
  tBuf->NextToken();

  // Insert string delimiter
  delim[0] = *tBuf->lastToken;

  // Insert null terminator
  delim[1] = '\0';

  // Start reading the string constant
  tBuf->ReadConstant(*delim);

  // Read in string
  switch (tBuf->NextToken())
  {
    // Copy string, then accept closing symbol
    case TR_OK:
      tBuf->Accept(delim);
      break;

    // Must have been an empty string
    case TR_PUN:
      tBuf->Expect(delim);
      empty = TRUE;
      break;

    // This should be caught in tBuf
    case TR_EOF:
      ERR_FATAL(("Unexpected return code"));

    default:
      ERR_FATAL(("Missing case"));
  }

  // Create the new VNode
  VNode *newNode = new VNode;
  newNode->SetupString(empty ? "" : tBuf->prevToken);
  return (newNode);
}

  //
  // ParseAssignment
  //
  // Parse an item value assignment
  //
  Bool CmdParse::ParseAssignment(void *context, VarSys::VarItem *item)
  {
    ASSERT(item);

    // Peek at the next token
    switch (tBuf.PeekToken())
    { 
      case TR_OK:
        break;

      case TR_PUN:
      {
        switch (*tBuf.peekToken)
        {
          case '=':
            tBuf.AcceptPunct();
            break;

          case ';':
            return (FALSE);
            break;
        }
        break;
      }

      case TR_EOF:
        return (FALSE);
        break;

      default:
        ERR_FATAL(("Missing case"));
    }    

    // Allow editing in a development build
    #ifdef DEVELOPMENT

      // But give a warning
      if (item->flags & VarSys::NOEDIT)
      {
        CON_ERR(("Warning! Can not be modified in a release build"))
      } 

    #else

      // Check that this item can be edited from the console
      if (item->flags & VarSys::NOEDIT)
      {
        tBuf.TokenError("This item can not be modified");
      }

    #endif

    VNode *node;

    // See if we are assigning one var to another
    if (ParseVarAssignment(context, item))
    {
      return (TRUE);
    }

    // Parse the VNode data
    if ((node = StdParse::ParseAtomicVNode(&tBuf)) == NULL)
    {
      // Convert a single identifier to a string value
      if (tBuf.PeekToken() == TR_OK)
      {
        tBuf.AcceptIdent();
        node = new VNode;
        node->SetupString(tBuf.lastToken);   
      }
      else
      {  
        tBuf.TokenError("Invalid value");
      }
    }
  
    // Assign the new value
    switch (item->type)
    {
      // Changing an integer item
      case VarSys::VI_INTEGER:
        switch (node->aType)
        {
          case VNode::AT_INTEGER:
            item->SetInteger(node->GetInteger());
            break;
          case VNode::AT_FPOINT:
            item->SetInteger((S32)node->GetFPoint());
            break;
          default:
            delete node;
            tBuf.TokenError("Expected %s value", VarSys::GetTypeString(item->type));
        }
        break;

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