Hello,
I am getting the following error message as Output of a tree generating grammar
which I am currently writing.
Exception in thread "main" org.antlr.runtime.tree.RewriteEmptyStreamException:
rule sp_decls
at
org.antlr.runtime.tree.RewriteRuleElementStream._next(RewriteRuleElementStream.java:158)
at
org.antlr.runtime.tree.RewriteRuleElementStream.nextTree(RewriteRuleElementStream.java:145)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.sp_block_content(MySQLASTGenParser.java:10730)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.sp_unlabeled_block(MySQLASTGenParser.java:9691)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.sp_proc_stmt(MySQLASTGenParser.java:8577)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.sp_tail(MySQLASTGenParser.java:1691)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.no_definer_tail(MySQLASTGenParser.java:1541)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.view_or_trigger_or_sp_or_event(MySQLASTGenParser.java:1401)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.create(MySQLASTGenParser.java:1260)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.stmt(MySQLASTGenParser.java:1186)
at
com.ingres.antlr.idiom.mysql.MySQLASTGenParser.prog(MySQLASTGenParser.java:1117)
at __Test__.main(__Test__.java:16)
So the last rules are looking as the following:
sp_unlabeled_block:
sp_block_content
;
sp_block_content:
BEGIN_SYM
sp_decls
sp_proc_stmts
END -> sp_decls sp_proc_stmts //To ignore the BEGIN and END
;
sp_decls: (sp_decl ';')* -> (sp_decl)*;
sp_decl:
DECLARE_SYM sp_decl_idents
type
(sp_opt_default)? -> ^(TN_DECLARE ^(TN_PARAMS sp_decl_idents
type) ^(TN_TODO sp_opt_default)?)
| DECLARE_SYM ident CURSOR_SYM FOR_SYM sp_cursor_stmt ->
^(TN_DECLARE ^(TN_NAME ident) ^(TN_SELECT sp_cursor_stmt))
;
There is a TN_CODE token type which I want to use as the root node of the
subtree which will then have this TN_DECLARE nodes as child nodes. So I only
did rewrite the rules 'between' TN_CODE and TN_DECLARE to remove unnecessary
information like the ';' or the BEGIN and END keywords.
So I guess that the error occurs because my test input does not have a DECLARE
section, but this is OK because of the rule 'sp_decls: (sp_decl ';')* ->
(sp_decl)*;
' which says that there could be even no one (*=0 or multiple). So has anybody
an answer what is causing the issue and how to solve it?
BTW: Further information about the project is available here:
http://community.ingres.com/wiki/Ingres_Migration_Tool_Set_Idiom_MySQL
Regards, David
--
David Maier
Senior Software Engineer
Ingres Germany GmbH
Weimarer Straße 1a
D-98693 Ilmenau
PHONE: +49.3677.6785-59
FAX: +49.3677.6785-23
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