[antlr-interest] v3: failed predicate?

[Mark Mandel]

Anyone? Even a pointer in the right direction?

I can't seem to even find out exactly what the error means?

I'm guessing it means that the parser expects there to a token of Type
ALIAS at this point, but the gateway condition is false? would that be
correct?

Any help would be greatly appreciated.

Mark

On 1/31/07, Mark Mandel <mark.mandel at gmail.com> wrote:
> All,
>
> I'm running the latest version of ANTLR v3
>
> I get this error when I run the following input against my grammar:
> 'from onetomany.Basic join onetomany.Child'
>
> rule ALIAS failed predicate: { currentMode == ALIAS_MODE }?
>
> and I don't know what it means.
>
> I believe these are the relevant portions of my grammar:
>
> I've attached the full grammar in case this doesn't explain enough.
>
> I'm totally stumped.. so any help would be appreciated.
>
> fromStatement
>         :
>         FROM^ classClause (joinClause classClause ON joinCondition)*
>         ;
>
> classClause
>         :
>         CLASS_IDENTIFIER^ (AS ALIAS)?
>         ;
>
> joinClause
>         :
>         ((LEFT | RIGHT)? OUTER)? JOIN^
>         ;
>
> joinCondition
>         :
>         (
>         PROPERTY_IDENTIFIER (BOOLEAN_LOGIC PROPERTY_IDENTIFIER)*
>         |
>         conditionStatement
>         )
>         ;
>
> FROM    :
>         { currentMode == STRING_MODE }?=>
>         'from'
>         { setMode(CLASS_IDENTIFIER_MODE); }
>         ;
> AS      : //special case, not worrying about past mode
>         { currentMode == STRING_MODE }?=>
>         'as'
>         { currentMode = ALIAS_MODE; }
>                 ;
> ALIAS   :
>         { currentMode == ALIAS_MODE }?=>
>         LETTER(LETTER|DIGIT|'_')*
>         { currentMode = STRING_MODE; }
>         ;
> JOIN    :
>         { currentMode == STRING_MODE }?=>
>         'join'
>         ;
> ON      :
>         { currentMode == STRING_MODE }?=>
>         'join'
>         { setMode(PROPERTY_IDENTIFIER_MODE); }
>         ;
> CLASS_IDENTIFIER
>         :
>         { currentMode == CLASS_IDENTIFIER_MODE }?=>
>         IDENTIFIER
>         { setMode(STRING_MODE);  }
>         ;
> PROPERTY_IDENTIFIER
>         :
>         { currentMode == PROPERTY_IDENTIFIER_MODE }?=>
>         IDENTIFIER
>         { setMode(STRING_MODE);  }
>         ;
> fragment IDENTIFIER
>         :
>         LETTER(LETTER|DIGIT|'.'|'_')+
>         ;
> TIA
>
> Mark
>
>
> --
> E: mark.mandel at gmail.com
> W: www.compoundtheory.com
>
>
>


-- 
E: mark.mandel at gmail.com
W: www.compoundtheory.com