ExpanderVisitor Class Reference

The Expander Visitor's work consists in printing out the values of the parsed constants and tokens. More...

Inherited Class(es)

• public Visitor

• ExpanderVisitor ( std::ostream & os , bool bRestoreWS = true ) 
• virtual ~ExpanderVisitor ( ) 
• virtual bool process ( gsp::Symbol * & rpSymbol ) 
• virtual bool process ( const char * c_pszConstant , gsp::Symbol & parent , unsigned long uSymbolRank ) 

• std::ostream & m_os 
• bool m_bRestoreWS 

Detailed Description

The Expander Visitor's work consists in printing out the values of the parsed constants and tokens.

The symbol's expand() functions are implemented using this visitor.

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Functions Documentation

Constructor.

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Destructor.

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If the symbol is a non-terminal, it does nothing and true is returned. If the symbol is a token, it prints out the value of the token as it was parsed in the original input stream.

Returns true if the operation was successful, which is normally always the case if the expanded symbol was initially parsed successfully.

The code executed is the following:

Example:

  if (rpSymbol)
    {
      if (rpSymbol->isToken())
	{
	  rpSymbol->restore_ws(0, m_os);
	  rpSymbol->expand(m_os);
	}
      else // (rpSymbol->isNonTerminal())
	{
	  // Nothing to do
	}
      return true;
    }
  else
    {
      return false;
    }

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Prints out the value of the passed constant, restituting the preceding whitespaces that were eaten during parsing.

Returns always true.

The code executed is the following:

Example:

  parent.restore_ws(uSymbolRank, m_os);
  m_os << c_pszConstant;
  return true;

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