bugGrammatica - Bugs: bug #8601, Add --verbose output flag to track...

 
 

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bug #8601: Add --verbose output flag to track grammar preparation

Submitter:  Per Cederberg <cederberg>
Submitted:  Fri 16 Apr 2004 10:40:57 PM UTC
 
Severity:  5 - Major Item Group:  Future Improvement
Status:  None Assigned to:  cederberg
Open/Closed:  Open
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Fri 16 Apr 2004 10:40:57 PM UTC, original submission:  

When creating a parser, look-ahead sets are calculated for all productions in the grammar. Normally this is a reasonably quick operation, but in some extreme cases it can be very slow due to inherent ambiguities in combination with a combinatorial explosion. When look-ahead sets starts growing to sizes of more than a thousand entries, the look-ahead calculation in general slows down to a crawl.

Currently the --debug mode and others do not print anything during this phase, which leads the user into thinking that Grammatica has entered an infinite loop. This should be remedied by either changing the --debug mode to print information on conflicts while the look-ahead calculation is being done, or by adding a new --verbose flag that causes such printouts to occur.

Per Cederberg <cederberg>
Project Administrator

 

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Attached Files
file #1216:  jml.orig.grammar added by cederberg (30KiB - application/octet-stream - An example grammar file causing the problematic behaviour)

 

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Follows 1 latest change.

Date Changed by Updated Field Previous Value => Replaced by
2004-04-16 cederberg Attached File- Added jml.orig.grammar, #1199

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