[antlr-interest] The behavior.....

[Meena Vinod]

Hi Dave,
I am back with my problem:
heres my Test.g

----------------------------------------------------------------------------------------------------------------
grammar Test;

options
{
   output = AST;
   ASTLabelType    = CommonTree;
}

tokens
{
    T_COMMAND;
    T_ACTION;
    T_OPT;

}

validate_cmd:         command  EOF -> ^(T_COMMAND command);

command:        action1 | action2;

action1:         action1_name (action1_opt)* ;

action2:        action2_name (action2_opt)* ;

action1_name:        ACTION1 -> ^(T_ACTION ACTION1) ;

action2_name:        ACTION2 -> ^(T_ACTION ACTION2) ;

action1_opt:        tsep action1_tree -> ^(T_OPT action1_tree);

action1_tree:        (common_options | wait_option)+;
             
action2_opt:        tsep action2_tree -> ^(T_OPT action2_tree);

action2_tree:        (common_options)+;

common_options:        version_option | help_option ;
            
wait_option:        WAIT;
    
version_option:        VERSION_OPTION;

help_option:        HELP_OPTION;
    
ACTION1    :        'copy';

ACTION2    :        'cut';

VERSION_OPTION:     '-v'('ersion')?;

HELP_OPTION:         '-h'('elp')?;

WAIT    :        '-w'('ait')?;

SEMI:             ';' ;

DIGIT    :        ('0'..'9')*;

tsep    :        WSP;

WSP    :        ('\u0009' | ' ')+;        

-----------------------------------------------------------------------------------------------------------------------
An input of type "copy -v -h" will work fine.

An input like "junk" comes back with the indeterminate state. There is no exception thrown. Infact, the EOF around for every command. 

Am I missing something here?

Thanks in advance,
Ambica




________________________________
From: David Peckham <dave.peckham at me.com>
To: Meena Vinod <spprtmail09 at yahoo.com>
Cc: antlr-interest at antlr.org
Sent: Tuesday, January 27, 2009 11:04:44 AM
Subject: Re: [antlr-interest] The behavior.....


Try:


cmd_validate
:cmd CMD_OPTION EOF
;

ANTLR will report errors if you have extra input.

Dave


On Jan 26, 2009, at 8:03 PM, Meena Vinod wrote:

Hello,
This pet project of mine requires that I can validate a command. The command is of the form <command_name><command options>

My lexer consists of all the command names and options:

Ex: 
    
    CMD_CD : 'cd';
    CMD_SHOW: 'show';
    CMD_RESET: 'reset';
    CMD_SET: 'set';
    CMD_OPTION: '-all' | '-help';
    TSEP: ' ' { SKIP(); };

The parser is defined as:
cmd_validate: (cmd)(CMD_OPTION);

cmd: CMD_CD | CMD_SHOW | CMD_RESET | CMD_SET;

For all valid inputs, the cmd_validate behaves properly.

On the ANTLRWorks, when I give a junk input say 'zee zee', the ANTLRWorks does not generate any proper output and does not evn throw an exception.
Also, the C code generated hangs when given this input.

Can someone help me out on this?

Many thanks,
Swift. 



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