Why am I getting an NPE on the following test grammar? Thanks.
I am having a hard time getting the @header into my grammar without
getting a NPE error. What am I doing wrong? Thanks for the help.
(ANTLR Parser Generator Version 3.3 Nov 30, 2010 12:45:30)
THE FOLLOWING test GRAMMAR:
grammar test;
options {
language=Java;
}
@header {
package org.antlr.test;
}
tokens {
TEST='test';
}
INT : '0'..'9'+ ;
GAVE THIS ERROR:
error(100): test.g:11:1: syntax error: antlr: test.g:11:1: unexpected
token: tokens {
error(150): grammar file test.g has no rules
error(100): test.g:0:0: syntax error: assign.types: <AST>:0:0:
unexpected end of subtree
error(100): test.g:0:0: syntax error: define: <AST>:0:0: unexpected
end of subtree
error(10): internal error: test.g : java.lang.NullPointerException
org.antlr.grammar.v2.DefineGrammarItemsWalker.trimGrammar(DefineGrammarItemsWalker.java:94)
org.antlr.grammar.v2.DefineGrammarItemsWalker.finish(DefineGrammarItemsWalker.java:77)
org.antlr.grammar.v2.DefineGrammarItemsWalker.grammar(DefineGrammarItemsWalker.java:206)
org.antlr.tool.Grammar.defineGrammarSymbols(Grammar.java:707)
org.antlr.tool.CompositeGrammar.defineGrammarSymbols(CompositeGrammar.java:352)
org.antlr.Tool.process(Tool.java:452)
org.antlr.Tool.main(Tool.java:89)
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