[antlr-interest] case-insensitive parsing

[Bob Sole]

Hi Andreas,

Unfortunately that won't help me in this case, because I still need to be
able to parse the contents of the comments. The overall aim is to extract
Javadoc-style tags such as "@param" from the comment section and match them
to procedure parameters, e.g.

/** this procedure does nothing much
  @param aString this is a string
  @param anInt this is a number
*/
PROCEDURE thingy(aString IN VARCHAR2, anInt IN OUT NUMBER);

I need to be able to handle the keywords in a case-insensitive manner,
because the codebase I'm working with evolved over many years and is frankly
a real mess. For example, some developers declare procedures like this:

Procedure Thingy(AString IN Varchar2, AnInt In Out Number);

whereas others do it C-style :-)

procedure thingy(a_string in varchar2, an_int in out number);

Horrible, I know. But I need to be able to parse all combinations thereof
:-)
I've looked at PLDoc, but it doesn't really address this issue.

Cheers
Bob.

On Thu, Apr 23, 2009 at 1:20 PM, Andreas Meyer
<andreas.meyer at smartshift.de>wrote:

> Have you tried making the whole comment a lexer token? This way, the
> keyword tokens would not interfere with plain text inside comments (If
> that was your intention: lexer rule names have to start with an upper
> case letter)
>
> Andreas
>
>
> Bob Sole schrieb:
> > I'm trying to write a parser for PL/SQL package header files but I'm
> > banging my head against the wall with a basic problem to do with
> > case-insensitive parsing. I'm using Jim Idle's NoCaseFileStream to
> > convert tokens into upper case, but I'm finding that the parser gets
> > confused when it comes across language keywords that are embedded
> > within comments. Here's some example input which has the OR keyword
> > embedded within the package comment. The "create or replace package"
> > statement is deliberately messed up - the parser handles this
> > correctly, but it stumbles against the first 'or' on line 2:
> >
> > /**
> > blah blah or blah
> > */
> > create Or rePlace PACKAGE
> > test IS
> >
> > Here's the grammar:
> >
> > grammar Test;
> >
> > input: statement+ ;
> >
> > statement: pkgComment | pkgStmt ;
> >
> > pkgComment: '/**' description '*/' ;
>
>
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