Hi,
working on a huge grammar ( approx 1300 rules) , I hit several mutual left-recursion situation.
Following the wiki (thanks to Johannes Luber), I removed the Mutual Left-recursed rules.
at the end, I have an error message from Antlr that indicates a Mutual left-recursion on 1 rule:
[22:21:26] Checking Grammar...
[22:21:26] error(210): The following sets of rules are mutually left-recursive [value_expression_primary]
[22:21:26] Aborting because the following rules are mutually left-recursive:
[[T.value_expression_primary,index=2,line=16]]
[22:21:26] java.lang.ClassCastException: org.antlr.tool.Rule cannot be cast to java.lang.String
at org.antlr.works.grammar.antlr.ANTLRGrammarEngineImpl.markLeftRecursiveRules(Unknown Source)
at org.antlr.works.grammar.antlr.ANTLRGrammarEngineImpl.analyze(Unknown Source)
at org.antlr.works.grammar.engine.GrammarEngineImpl.analyze(Unknown Source)
at org.antlr.works.grammar.CheckGrammar.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
here is the extract of the grammar, any help will be greatly appreciated:
Babak
grammar T ;
tokens {
LEFT_PAREN ='(' ;
RIGHT_PAREN = ')';
CONCATENATION_OPERATOR = '||' ;
LEFT_BRACKET_OR_TRIGRAPH = '[' ;
RIGHT_BRACKET_OR_TRIGRAPH = ']' ;
PERIOD = '.' ;
}
start
: value_expression_primary EOF ;
value_expression_primary :
(LEFT_PAREN value_expression RIGHT_PAREN
| unsigned_value_specification
| column_reference
| set_function_specification
| window_function
| scalar_subquery
| case_expression
| cast_specification
| subtype_treatment
| value_expression_primary PERIOD method_name sql_argument_list?
| generalized_invocation
| static_method_invocation
| new_specification
| reference_resolution
| collection_value_constructor
| multiset_element_reference
| routine_invocation
| next_value_expression
)
(PERIOD field_name
| dereference_operator qualified_identifier sql_argument_list?
| (CONCATENATION_OPERATOR value_expression_primary)* LEFT_BRACKET_OR_TRIGRAPH numeric_value_expression RIGHT_BRACKET_OR_TRIGRAPH
)*
;
numeric_value_expression
: ;
qualified_identifier
: ;
dereference_operator
: ;
field_name
: ;
value_expression
: ;
unsigned_value_specification
: ;
column_reference:;
set_function_specification
: ;
window_function
: ;
scalar_subquery
: ;
case_expression
: ;
cast_specification
: ;
subtype_treatment
: ;
sql_argument_list
: ;
generalized_invocation
: ;
static_method_invocation
: ;
new_specification
: ;
reference_resolution
: ;
collection_value_constructor
: ;
multiset_element_reference
: ;
routine_invocation
: ;
next_value_expression : ;
method_name
: ;
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