problem with lex?

[LiLgirL]

Hi, I wrote a lex file, but when I try to compile it, I get this error:

l3.lex:64: parse error before `{'

I don't see any errors.

Here is my code:

%{
%}

/* regular definitions */

blank		[ \t\n]
ws		{blank}+
comment 	[\{]([^\{\n])*[\}]
letter 		[a-zA-Z]
digit 		[0-9]
id    		{letter}({letter}|{digit})*
digits 		{digit}+
optional_frac	(\.{digits})?
optional_Iexp	(E[+]?{digits})?
optional_Rexp	(E[+|-]?{digits})?
inum		{digits}({optional_Iexp})
rnum		{digits}({optional_frac})({optional_Rexp})

%%

{ws}		{// Do Nothing}
{comment} 	{// Do Nothing}
program		{return(PROGRAM);}
var		{return(VAR);}
array		{return(ARRAY);}
of		{return(OF);}
real		{return(REAL);}
integer 	{return(INTEGER);}
function 	{return(FUNC);}
procedure 	{return(PROC);}
begin		{return(BEG);}
end		{return(END);}
if		{return(IF);}
else		{return(ELSE);}
then		{return(THEN);}
while		{return(WHILE);}
do		{return(DO);}
or		{return(ADDOP);}
not		{return(NOT);}
and		{return(MULOP);}
div		{return(MULOP);}
mod		{return(MULOP);}
{id}		{install_id(); return(ID);}
{inum}  	{install_iNum(); return(INUM);}
{rnum}  	{install_rNum(); return(RNUM);}
":="		{return(ASSIGNOP);}
"="		{return(RELOP);}
"<>"		{return(RELOP);}
"<"		{return(RELOP);}
"<="		{return(RELOP);}
">="		{return(RELOP);}
">"		{return(RELOP);}
"*"		{return(MULOP);}
"/"		{return(MULOP);}
.		{return yytext[0];}

%%

install_id()  {

  pTmp=findEntry(yytext);
  if ( pTmp == NULL )
	pTmp=addEntry(yytext);

  if ( pTmp == NULL ) {
	fprintf(stderr, "Error: Could not insert %s into symbol table.\n", 
yytext);
	exit(1);	
  }
  
  yylval.id_info.pEntry=pTmp;

}

install_iNum()  {
  
  yylval.iVal = atoi(yytext);
}  
  
install_rNum()  {
  
  yylval.rVal = atof(yytext);
}

Can anyone see anything wrong with this code?

[quzah]

Originally posted by LiLgirL
Hi, I wrote a lex file, but when I try to compile it, I get this error:

..snip...

Can anyone see anything wrong with this code?

You mean aside from the fact that this is the C board and not a Lex board?

Quzah.

[swoopy]

>.		{return yytext[0];}

Wild guess, maybe you need quotes around the dot:
"." {return yytext[0];}

[LiLgirL]

Thanks for the ideas.

The problem was here:

{ws}		{// Do Nothing}
{comment} 	{// Do Nothing}

The // was commenting out the closing braces as well, therefore causing the parse error. :-)

[swoopy]

Wow, I would have never spotted that! Talk about hidden. Glad you found it.