[antlr-interest] how to match any char between two string?

[Kevin Chen]

Thanks for you reply!

In that case, it work. But it isn't enough.
I consider a grammar:

select [ any character (an expr of an another app) ] from [ any character (an expr of an another app) ]  //required
    where [ any character (an expr of an another app) ]      //optional element
    order by [ any character (an expr of an another app) ]   //optional element
    group by [ any character (an expr of an another app) ]   //optional element
    limit [ any character (an expr of an another app) ]      //optional element
    option [key1 = value1 [,key2 = value2 ...] ]    //optional element, if any, require more then one key-value-pair

for example:

1.
  SELECT *, INTERVAL(posted,NOW()-7*86400,NOW()-86400) AS timeseg, 
         AVG(price) AS avgprice, COUNT(DISTINCT storeid), @ID, @weight
    from one , TWO, three
      where MATCH( '"test doc"/3'| '@@title hello' )
      OPTION one = 1,
             two = 2

2.
  SELECT *, INTERVAL(posted,NOW()-7*86400,NOW()-86400) AS timeseg, 

         AVG(price) AS avgprice, COUNT(DISTINCT storeid), @ID, @weight

    from one , TWO, three

      where MATCH( '"test doc"/3'| '@@title hello' )

      order by timeseg DESC, @weight DESC 

      group by @count
      limit 100 + @count

      OPTION three = 3,

             four = 4

I don't want to analyze those expressions,
'cause there's an another application will analyze those expressions.

The point is I don't know how to get the "any character"s...

Thanks a lot !   :-)


THE
     POWER
             OF
                JAVA




You get the error because 'SELECT' will match everything in the input
till EOF greedily (because of .+) and obviously WS cannot match
anything. When you use .+, you have to turn off greedy. Try something
like:



TEXT            :    SELECT ( options {greedy=false;} : . )* FROM



This should work:



grammar Test;



r    :    TEXT

        {

            System.out.println( $TEXT.text );

        }

    ;



TEXT            :    SELECT ( options {greedy=false;} : . )* FROM

    {

        String str =$text;

        setText( str.substring(6, str.length()-4) );

    }

    ;



fragment

SELECT    :    'select'

    ;

    

fragment

FROM    :    'from'

    ;

    



Cheers, Indhu





陈凯成 wrote:

  Hi!

  

I hava to intercept a expression between two string, and then send to
another application.

  

like a Java regex, for example:

  

//
-------------------------------------------------------------------------

// Java Code Begin

//
-------------------------------------------------------------------------

  

String regex  = "select\\s+((.)+)\\s+from";

Pattern p = Pattern.complie(regex);

Matcher m = p.matcher("select stu.id as 'Student ID', stu.name as
'Student Name' from");

String select = null;

if(m.find()){

    select = m.group(1);

}

System.out.println(select);// print [stu.id as 'Student ID', stu.name
as 'Student Name']

send(select);// send to another application.

  

//
-------------------------------------------------------------------------

// Java Code End

//
-------------------------------------------------------------------------

  

I try to write a sample grammar file, but it dosen't works.

  

//
-------------------------------------------------------------------------

// Grammar File Begin

//
-------------------------------------------------------------------------

  

start        :    'select' WS SELECT WS 'from';

SELECT    :    (.)+ {

    System.out.println(getText());

    send(getText());

};

WS         :    ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+;

  

//
-------------------------------------------------------------------------

// Grammar File End

//
-------------------------------------------------------------------------

  

I get a error message as follow when I generate code:

  

//
-------------------------------------------------------------------------

// Error Message Begin

//
-------------------------------------------------------------------------

  

[23:31:49] error(208): Sql.g:28:1: The following token definitions can
never be matched because prior tokens match the same input: WS

  

//
-------------------------------------------------------------------------

// Message Begin

//
-------------------------------------------------------------------------

  

Thanks a lot!

  

  ---------------------------------

  THE

     POWER

             OF

                JAVA


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