Optional parser rules skips if the value not matched

[ayyanar ayns]

 I have expresion like below 

expression
    : query (logical query)*
    ;

logical
    : 'and'
    | 'or'
    | 'OR'
    | 'AND'
    | '&&'
    | '||'
    ;

Note: I have validated the query rules its working file.. for validating logical if i give invalid it doesn't throws exception .. it was skipping 
can you any one help me ?

For example:

input is [abc and] it throws the exception as missing value of query valid behavious
if the input is [abc and1 ] it doesn't thows exception, its skips and printing only the value of abc 


here the abc is the value of query rules 

[Mike Lischke]

Sounds like the parser is skipping the unknown input. Does your top level rule end with EOF?

Mike
-- 
www.soft-gems.net

[ayyanar ayns]

does your top level rule end with EOF? what does it mean ? Sorry bro am just new to Antlr

[Mike Lischke]

>
> does your top level rule end with EOF? what does it mean ? Sorry bro am just new to Antlr

Assume you have a rule like "query“ which calls (among others) your expression rule. And this is the rule you call when you parse input (which makes it the top level rule). In order to tell the parser to consume all input for a successful parse run you should tell it to take everything into account that is available (by telling it to match until it sees the EOF token):

query: rule1 rule2 expression rule3 EOF;


Mike
--
www.soft-gems.net

[ayyanar ayns]

ya i have EOF in the my top level rul

Mike
--
www.soft-gems.net

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Thanking you,

Ayyanar M

Ph: +91-9940510705

[David Whitten]

So I'm confused what the problem is.

you said that a rule is complete when it has 

query (logical query)*

but you fed it

[abc and]

which translates to

query logical

which does not finish the (logical query) part

so you should create a exception/error because

it only partially filled out your requirement.

I expect there isn't a rule for 

query logical (query logical)*

which is supposed to match an error of a missing query

so you can print out an error message about the missing query,

so ANTLR is creating an exception to handle what you didn't do yourself.

Dave Whitten

713-870-3834 

On Sat, Apr 28, 2018 at 12:32 PM, ayyanar ayns <ayyan...@gmail.com> wrote:

ya i have EOF in the my top level rul