java.lang.IllegalArgumentException: The tokens list should not be empty

[jnorthrup]

#19 notwithstanding.. i have built what should be the simplest working Grammar class, alongside of the json benchmark which seems to work well.

however i am having no luck

see https://gist.github.com/jnorthrup/dd88da7d4715379bf357788e6a6ca9e3 which include a testcase and a pom to recreate a project

java.lang.IllegalArgumentException: The tokens list should not be empty

at com.github.h0tk3y.betterParse.lexer.DefaultTokenizer.<init>(DefaultTokenizer.kt:9)
at com.github.h0tk3y.betterParse.grammar.Grammar$tokenizer$2.invoke(Grammar.kt:31)
at com.github.h0tk3y.betterParse.grammar.Grammar$tokenizer$2.invoke(Grammar.kt:17)
at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
at com.github.h0tk3y.betterParse.grammar.Grammar.getTokenizer(Grammar.kt)
at com.github.h0tk3y.betterParse.grammar.GrammarKt.tryParseToEnd(Grammar.kt:63)
at com.fnreport.sentenceTest$1.invoke(sentenceTest.kt:23)
at com.fnreport.sentenceTest$1.invoke(sentenceTest.kt:18)
at io.kotlintest.Spec$runTest$callable$1$1.invoke(Spec.kt:124)
at io.kotlintest.Spec$runTest$callable$1$1.invoke(Spec.kt:15)
at io.kotlintest.Spec$runTest$initialInterceptor$1$1.invoke(Spec.kt:116)
at io.kotlintest.Spec$runTest$initialInterceptor$1$1.invoke(Spec.kt:15)
at io.kotlintest.Spec.interceptTestCase(Spec.kt:78)
at io.kotlintest.Spec$runTest$initialInterceptor$1.invoke(Spec.kt:116)
at io.kotlintest.Spec$runTest$initialInterceptor$1.invoke(Spec.kt:15)
at io.kotlintest.Spec$runTest$callable$1.call(Spec.kt:124)