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In Flex when is yylineno updated?


In Flex when is yylineno updated?

By : anyhus
Date : November 22 2020, 10:56 AM
around this issue
does r$ which matches a string at end of line change yylineno too?
code :


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Flex yylineno set to 1

Flex yylineno set to 1


By : bigrain
Date : March 29 2020, 07:55 AM
wish help you to fix your issue When I tried this, it turned out that I had to have a rule that actually matches newline for yylineno to be updated. With the following rule it worked, and without it yylineno never changed:
code :
\n { }
yylineno has always the same value in yacc file

yylineno has always the same value in yacc file


By : maddy
Date : March 29 2020, 07:55 AM
should help you out Assuming you are using yylineno from flex, then you should probably add a line
code :
%option yylineno
LEX- yylineno returning 1

LEX- yylineno returning 1


By : Vinaymehta Mehta
Date : March 29 2020, 07:55 AM
may help you . Other questions indicate that Flex has the ability to manage yylineno automatically via the %option yylineno directive. That is, however, an extension in Flex compared with classic Lex.
Assuming that you cannot upgrade to Flex, you probably need to replace your rule
code :
\n { }
\n { yylineno++; }
How to know what line will be printed in yylineno?

How to know what line will be printed in yylineno?


By : teo
Date : March 29 2020, 07:55 AM
Hope this helps The statement is not recognized as such until you reach the semicolon, which is on line 2. So at the moment that check_types_match is called, yylineno must point to line 2.
If you want to produce an error message with a different line number, you certainly need to decide which line should be printed. Here you have at least two possibilities, since the error is between the token int and the token true. In this case, both of those are on line 1, but what if the program text had been:
code :
int x =
  true;
Statement : Type ID ASSIGN Exp {check_types_match($1.type, $4.type, @1)} SC
typedef struct YYLTYPE {
  int first_line;
  int first_column;
  int last_line;
  int last_column;
} YYLTYPE;
@$.first_line = @1.first_line;
@$.first_column = @1.first_column;
@$.last_line = @N.last_line;
@$.last_column = @N.last_column;
yylloc.first_line = yylloc.last_line = yylineno;
yylloc.first_line = yylloc.last_line;
yylloc.last_line = yylineno;
#define YY_USER_ACTION do {             \
  yylloc.first_line = yylloc.last_line; \
  yylloc.last_line = yylineno;          \
} while(0)
Flex / Bison: Configure yylineno to recognize '\r' as newline

Flex / Bison: Configure yylineno to recognize '\r' as newline


By : Colin Cronin
Date : March 29 2020, 07:55 AM
Does that help The bad news is that flex does not have that feature. Line counting is not configurable at all, and it depends on static analysis of the patterns to see which ones might match a newline. That wouldn't be possible if a newline sequence were more than one byte long, because the newline sequence could be split over two separate tokens. (Make sure to take that fact into account if you are implementing your own line counter. The simplest solution would be to ensure that it is not possible for a token to end after the \r in a \r\n sequence.)
The good news is that \r-terminated files are pretty rare these days. So the cost of not handling them might not be huge.
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