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Re^2: PRD parser problem: How to deal with mutiple lines

by Hanken (Acolyte)
on Jun 16, 2008 at 08:47 UTC ( [id://692226]=note: print w/replies, xml ) Need Help??


in reply to Re: PRD parser problem: How to deal with mutiple lines
in thread PRD parser problem: How to deal with mutiple lines

Hi, Philcrow, thanks for your reply! Now I changed my grammar as following: 
    List:       'SECTION_START'
                SECTION_NAME
                SECTION_CONTENT
                'SECTION_END'
                |<error>
    
    SECTION_NAME:
                /\w+/ {print "section name is $item[1]\n";}
                |<error>
                
    SECTION_CONTENT: 
                Description
                |
                
    Description: 
                'DESCRIPTION' '=' Statement 
                |'DESCRIPTION' '=' '{' Statement(s?) '}' ';'

    Statement: 
               /.+\n/

[download]
But I still can not parse the multiple-lined contents inside the description brackets. 
section name is BANK001
section name is BANK002
section name is BANK003
Invalid List: Was expecting 'SECTION END' but found "UK BANK; " instea
+d

[download]
How can I do to solve it?

Replies are listed 'Best First'.
Re^3: PRD parser problem: How to deal with mutiple lines
by philcrow (Priest) on Jun 17, 2008 at 14:53 UTC
    I think your statement rule needs a trailing semi-colon. If you have further problems you should trace the execution. Do this by adding these statements to the program before constructing the parser: 
    $::RD_TRACE = 1;
$::RD_HINT = 1;

    [download]
    The first one is actually the tracer. Be warned that it will generate a lot of output. Reading it will help you understand what the parser is doing and will probably lead to the error.

    Phil

    The Gantry Web Framework Book is now available.
[reply]
[d/l]

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