DB2 DDL Parser using ANTLR 3

[Jawad Ahmed]

Hi,

I am implementing the DB2 DDL parser. I am facing an issue "Decision can match input such as "DATA" using multiple alternatives: 1, 2". I have mapped the Create Table syntax diagrams from DB2 documentation to my ANTLR grammar. There is a typed_table_options which has all optional tokens/clauses and ANTLR works showed that these paths are making multiple alternatives.

I have also posted the details on stackoverflow. The link is http://stackoverflow.com/questions/19218141/db2-ddl-parser-using-antlr-3.

I am attaching the snapshots of the ANTLR Works and DB2 syntax diagram.

Please help me in this regard.

[Jim Idle]

You will want to disambiguate with syntactic predicates and sometimes keywords can be identifiers. 

x: CREATE ((Tok)=>optional))? Etc

Single token predicates usually do it with SQL. 

Jim

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<ANTLR_Work_Img.jpg>

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[Jawad Ahmed]

Thanks Jim. This is what I need.