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| Tricky TDS parser behavior |
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| Tibor |
 Posted: Tue Dec 09, 2003 4:06 pm Post subject: Tricky TDS parser behavior |
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Grand Master
Joined: 20 May 2001
Posts: 1033
Location: Hungary
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Some of applications are using a legacy interface format - luckily TDS can parse it. Looks like:
| Code: |
UPDATE_REQUEST|id=1|
COMPONENT|com=1~id=2~....|
PROPERTY|p1|1|2|
PROPERTY|p2||Y|
...
END|
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We built up the stuctures in 'Tagged Delimited' fomat (MRM/TDS) with nested compound structures:
type: UpdateRequest
- type: Component
- type: Property
and the Group Terminator is 'END|<LF>' for type 'UpdateRequest', and '|<LF>' for Component and Property.
BUT lately appeared a new 'Property' and caused a parser error:
| Code: |
PROPERTY|XXX_STATUS||PEND|
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because contents 'END|<LF>' !!! And parser message in the error log pointed accurately to the first byte after it.
Now we convert 'PEND' to 'PEND_' in BLOB format there and back to avoid parser error 
Any ideas?
Tibor
Last edited by Tibor on Mon Dec 15, 2003 4:05 am; edited 1 time in total |
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| Tibor |
| Posted: Sat Dec 13, 2003 4:46 pm Post subject: |
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Grand Master
Joined: 20 May 2001
Posts: 1033
Location: Hungary
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OK, I wrote about a fabricated workaround, but this is ugly, slow, and so on. Anyone has some experince in TDS area or writing a simple parser is reasonable?
Tibor |
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| jefflowrey |
| Posted: Sun Dec 14, 2003 5:09 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I figured someone else would have answered by now.
You can probably make this work if you rearrange your model. In fact, it looks like you've got the classic/basic Header-body-trailer message. So you might as well model it that way
Make the END| a real element instead of being a group terminator. Then create a value constraint to make sure that it only holds END|. Put the LF as the group terminator.
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I am *not* the model of the modern major general. |
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