implicit token definition in parser rule

[Van Le Nguyen]

Hi all,

I type grammar CSV on page 143 of "The Definitive ANTLR 4 Reference" book use the ANTLRWork2.1 

. But the warning isue "implicit token definition in parser rule" at: row : field (',' field)* '\r'? '\n' ;

Could you help me!

Thanks you very much.

[Kevin Cummings]

On 08/03/15 12:34, Van Le Nguyen wrote:
> Hi all,
> I type grammar CSV on page 143 of "The Definitive ANTLR 4 Reference"
> book use the ANTLRWork2.1
> . But the warning isue "implicit token definition in parser rule" at:

> /row : field (',' field)* '\r'? '\n' ;/

> Could you help me!
> Thanks you very much.

Add token definitions for the literals:

COMMA: ',';
CR: '\r';
NL: '\n';

Then in your parser:

row : field (COMMA field)* CR? NL ;

You are now using explicit token definitions.

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--
Kevin J. Cummings
kjc...@verizon.net
cumm...@kjchome.homeip.net
cumm...@kjc386.framingham.ma.us
Registered Linux User #1232 (http://www.linuxcounter.net/)

[Van Le Nguyen]

On Tuesday, August 4, 2015 at 4:39:25 AM UTC+7, Kevin Cummings wrote:

On 08/03/15 12:34, Van Le Nguyen wrote:
> Hi all,
> I type grammar CSV on page 143 of "The Definitive ANTLR 4 Reference"
> book use the ANTLRWork2.1
> . But the warning isue "implicit token definition in parser rule" at:
> /row : field (',' field)* '\r'? '\n' ;/
> Could you help me!
> Thanks you very much.

Add token definitions for the literals:

COMMA:        ',';
CR:        '\r';
NL:        '\n';

Then in your parser:

row : field (COMMA field)* CR? NL ;

You are now using explicit token definitions.

> --
> You received this message because you are subscribed to the Google
> Groups "antlr-discussion" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to antlr-discussi...@googlegroups.com

> <mailto:antlr-discussion+unsub...@googlegroups.com>.

> For more options, visit https://groups.google.com/d/optout.

--
Kevin J. Cummings
kjc...@verizon.net
cumm...@kjchome.homeip.net
cumm...@kjc386.framingham.ma.us
Registered Linux User #1232 (http://www.linuxcounter.net/)

Thanks you very much