Hi there,
I implemented a simple grammar and I want to add support to allow empty
input. Empty input can be for example comments too. So I defined it this way
eat: (bananas)+
|
;
bananas: <lots of stuff here>
LINE_COMMENT : '//' ~('\r' | '\n')* {skip(); };
ETC...
The thing is if I put anything that does not match the grammar, i.e. empty
string, comment, whatever I get the following error when I try to get the
object that will represent my DSL:
java.lang.NullPointerException: null
at
org.antlr.runtime.tree.BaseTreeAdaptor.isNil(BaseTreeAdaptor.java:70)
~[antlr-runtime-3.2.jar:na]
at
org.antlr.runtime.tree.CommonTreeNodeStream.nextElement(CommonTreeNodeStream.java:93)
~[antlr-runtime-3.2.jar:na]
at
org.antlr.runtime.misc.LookaheadStream.fill(LookaheadStream.java:94)
~[antlr-runtime-3.2.jar:na]
at
org.antlr.runtime.misc.LookaheadStream.sync(LookaheadStream.java:88)
~[antlr-runtime-3.2.jar:na]
at org.antlr.runtime.misc.LookaheadStream.LT(LookaheadStream.java:119)
~[antlr-runtime-3.2.jar:na]
at
org.antlr.runtime.tree.CommonTreeNodeStream.LA(CommonTreeNodeStream.java:116)
~[antlr-runtime-3.2.jar:na]
at
com.feedzai.pulse.service.kpi.parser.KpiTree.script(KpiTree.java:85)
~[classes/:na]
Does anyone know how can I achieve this?
Thank you in advance,
Rui Vilao
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