[antlr-interest] ANTLR first time user getting error
Bart Kiers
bkiers at gmail.com
Sat Sep 11 23:57:24 PDT 2010
On Sun, Sep 12, 2010 at 1:51 AM, Dibyendu Majumdar
<mobile at majumdar.org.uk>wrote:
> Hi,
>
> I am trying to use ANTLR for the first time, and am getting an error when
> trying to run the grammar shown below; I would be grateful for any help in
> identifying what the issue is.
>
> The test input I am using is:
>
> package test;
>
> I am using the Eclipse ANTLR IDE plugin and when I try to interpret above,
> I
> get:
> MimatchedTokenException: Line 1:7 mismatched input '' expecting '\u0006'
>
>
Here's the same grammar except with a little main method in the parser:
grammar Problematic;
@members {
public static void main(String[] args) throws Exception {
String source = "package test;";
ANTLRStringStream in = new ANTLRStringStream(source);
ProblematicLexer lexer = new ProblematicLexer(in);
CommonTokenStream tokens = new CommonTokenStream(lexer);
ProblematicParser parser = new ProblematicParser(tokens);
parser.compilationUnit();
}
}
compilationUnit
: packageDeclaration
;
packageDeclaration
: PACKAGE qualifiedName SEMI
;
qualifiedName
: IDENTIFIER (DOT IDENTIFIER)*
;
WS
: ( ' '
| '\r'
| '\t'
| '\u000C'
| '\n'
)
{
skip();
}
;
PACKAGE
: 'package'
;
SEMI
: ';'
;
DOT
: '.'
;
IDENTIFIER
: ('a'..'z'|'A'..'Z'|'_'|'$') ('a'..'z'|'A'..'Z'|'_'|'0'..'9'|'$')*
;
and when generating a parser/lexer from the grammar, and running the
parser (under Windows, replace the colons in the commands below by
semi-colons.):
java -cp antlr-3.2.jar org.antlr.Tool Problematic.g
javac -cp .:antlr-3.2.jar *.java
java -cp .:antlr-3.2.jar ProblematicParser
there are no problems whatsoever.
So there must be something wrong with your Eclipse plugin and not with ANTLR
itself.
Regards,
Bart.
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