[ragel-users] Problem with tag comment implementation

[Hardik Parikh]

Hi,

 

    I have requirement to consider following as valid comment in source
language

 

    |abc#

             Some description ...

   #abc|

 

  And following is invalid comment

 

    |abc#

             Some description ...

    #xyz|

 

And for above requirement I need to capture token string and performed match
operation as there is no inbuilt support for backward reference in ragel

I tried out with following implementation

 

action mark_start{

     start = fpc+1;

    // printf(" Mark start at %c\n",fc);

  }

 action tagstart{

    size_t len = fpc - start ;

    s = calloc(len,sizeof(char));

    strncpy(s,start,len);

    s[len]='\0';

  //  printf("Start : %s\n",s);

  }

 

 action tagend{

    size_t len = fpc - start ;

    e = calloc(len,sizeof(char));

    strncpy(e,start,len);

    e[len]='\0';

   stringcmp = strncmp(e,s,sizeof(s));

    //printf("End : %s\n",e);

  }

 

   curl_tag_comment =

    '|'@mark_start (nonnewline - ws)* '#'@tagstart @comment(

      newline %{ entity = INTERNAL_NL; } %curl_ccallback

      |

      ws

      |

      (nonnewline - ws) @comment

    )* :>> ('#'@mark_start (nonnewline - ws)* '|' @tagend  when { stringcmp
== 0}) @comment;

 

 

Now I am able to capture both start and end substring properly and able to
do math operation in when condition but it produces as a valid commet in
parser for even a non valid statement.

 

Like

 

curl comment |abc#

curl comment             Some  description ...

curl comment  #xyz|

 

Please provide me any suggestions where I am doing something wrong or is
there any other better way to implement the same.

 

Thanks & Regards

Hardik Parikh

 


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