Thanks a ton Dave. That surely helped solve the problem.
I have a new problem now. My application's .g is as follows:
CMD_CD : 'cd';
CMD_SHOW: 'show';
CMD_RESET: 'reset';
CMD_SET: 'set';
CMD_OPTION: (' -all' | ' -help' | ' -version' | ' -display')*;
TSEP: ' ' { SKIP(); };
The parser is defined as:
cmd_validate: (cmd)(CMD_OPTION) EOF;
cmd: CMD_CD | CMD_SHOW | CMD_RESET | CMD_SET;
A valid input to my application is "cd -help -version -display". I can achieve
this with the " " (space) prefixed for each of the CMD_OPTION value.
However, if I enter "cd-help", then my application hangs on ANTLRWorks and even
my C code hangs.
I would want to ensure that there is a space between the "cmd" and the
"cmd_option" (if there is a cmd_option value).
So, my application takes values as follows:
1. cd -help -version -display
2. cd -version
3. cd
4. show -help -version -display....... et al
What should I do so that it throws an exception when I enter "cd-help" or
"show-version"?
Could you please help me on this too?
Regards,
Swift
________________________________
From: David Peckham <dave.peck...@me.com>
To: Meena Vinod <spprtmai...@yahoo.com>
Cc: antlr-inter...@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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