lexer should correctly create StringLiterals for following examples

#define likely(x) (x)
#define unlikely(x) (x)

void ddd_assert_fail (const char *assertion, const char *file,
		      unsigned int line, const char *function);


#define _assert_fn ""


#define assert(ex) \
_ASSERT_VOID_CAST(unlikely(ex) ? \
  0 : \
  (ddd_assert_fail (#ex, __FILE__, __LINE__, _assert_fn), 0) \
  )

void foo() { 
    if ("1" "2" 
         "3" != 0) {
      assert ( "1" "2" 
             "3" != 0);
    }
}

Note:
need to update StringLiteral rule like:
StringLiteral
        :
            (
                (options{warnWhenFollowAmbig = false; }: 
                    StringPart 
                    (options{warnWhenFollowAmbig = false; }: 
                            InterStringWhitespace
                    )*
                )+
            )
        ;

protected
InterStringWhitespace	
	:	(	(' ' |'\t' | '\f')
			// handle newlines
		|	(        
                           { (LA(1) == '\r') && (LA(2) == '\n') }? "\r\n"  // MS
			|   '\r'    // Mac
			|   '\n'    // Unix 
			)	{ newline(); }
		)	
                { 
                        $setType(Token.SKIP);
                }
	;

protected
StringPart
	:	'"'
		( Escape
		|	(	"\\\r\n"   // MS 
			|	"\\\r"     // MAC
			|	"\\\n"     // Unix
			)	{newline();}
		|	~('"' | '\r' | '\n' | '\\')
		)*
		'"'
	;

+ need to handle correct creating of parameters in MacroExpander.addParam.
string should be correctly concatenated. Is it possible to do on lexer level?