Blank lines aren't ignored

[ahenshaw]

In this simple LP file

\ LP format example

Minimize
obj:  x + 10 y
Subject To
r01:  x + y  >= 1
Binaries
 x y
End

if I add a blank line before "Binaries", then the Binaries section is not read. Looking at the Pest file, it seems that blank lines aren't handled as specified in the IBM specs.

[dandxy89]

Thanks for all the feedback much appreciated.

I'll take a look at all three in the morning.

[ahenshaw]

Thanks! And thanks for developing this library!

I'm using it in my project: https://github.com/ahenshaw/balas

---

From: Dan @.> Sent: Tuesday, January 2, 2024 2:52:58 PM To: dandxy89/lp_parser_rs @.> Cc: Andrew Henshaw @.>; Author @.> Subject: Re: [dandxy89/lp_parser_rs] Blank lines aren't ignored (Issue #25)

Thanks for all the feedback much appreciated.

I'll take a look at all three in the morning.

— Reply to this email directly, view it on GitHubhttps://github.com/dandxy89/lp_parser_rs/issues/25#issuecomment-1874477211, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AAOZY2WGXHQTQROHWAXVMFLYMRQRVAVCNFSM6AAAAABBKOOSSOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQNZUGQ3TOMRRGE. You are receiving this because you authored the thread.Message ID: @.***>

[ahenshaw]

I don't think this is fixed everywhere. The specific example that I gave above is fixed, but if I add the blank line after "Binaries", then it doesn't work. My understanding of the spec is that blank lines should be ignored everywhere.

[ahenshaw]

Also, I believe comments should be more universally allowed. In the example below, I wanted to comment out two constraints, but the parser gives this error:```

Caused by: --> 4:1	4	\ c001: - 2 x1 + 6 x2 - 3 x3 + 4 x4 + 1 x5 - 2 x6 >= 2	^---

  = expected CONSTRAINT

Minimize obj: 3x1 + 5x2 + 6x3 + 9x4 + 10x5 + 10x6 Subject To \ c001: - 2 x1 + 6 x2 - 3 x3 + 4 x4 + 1 x5 - 2 x6 >= 2 \ c002: - 5 x1 - 3 x2 + 1 x3 + 3 x4 - 2 x5 + 1 x6 >= -2 c003: 5 x1 - 1 x2 + 4 x3 - 2 x4 + 2 x5 - 1 x6 >= 3 Binaries x1 x2 x3 x4 x5 x6 End

[dandxy89]

Appreciate all the feedback. Let me take another look at this tonight.

[ahenshaw]

Blank lines everywhere seem to work properly. However, still can't put comments everywhere. I believe that is the last issue that I've run across. Great job on this!

[dandxy89]

I'm not going to have any time this evening to look into this.

Will take a look at this tomorrow

[dandxy89]

@ahenshaw, could you give it another shot? If it doesn't work out, could you share examples of what's not functioning properly?

Would you mind pointing me to the repository/project you're working on?

[ahenshaw]

This passes all of the tests that I have. Great job! My repo is https://github.com/ahenshaw/balas

[dandxy89]

Thanks for sharing - will review it over the weekend and see if there is anything I can do in lp_parser that could assist with the work you're doing over there.