About Haskell Grammar use

[Boroughbuga]

Hello,

I am new to Antlr and I am trying to make use of the Haskell Language Grammar provided here however I am running into some problems when I am trying to execute the examples provided with the grammar.

For example when I simply run this command

antlr4-parse .\HaskellParser.g4 .\HaskellLexer.g4 module -tree \examples\doAndCase.hs

it gives me this error message;
line 1:10 no viable alternative at input 'doGuessing '

It gives pretty much similar errors for all the examples.
What am I doing wrong?

[kaby76]

antlr4-parse uses the interpreter for the grammar. Unfortunately, the interpreter won't work because it cannot execute target-specific code in the haskell grammar. A parser and lexer must be generated and compiled. The haskell grammar has two ports: CSharp and Java.

antlr4 HaskellLexer.g4 HaskellParser.g4
cp Java/*.java .
javac -cp ".../antlr4-4.12.0-complete.jar;." *.java
java -cp ".../antlr4-4.12.0-complete.jar;." org.antlr.v4.gui.TestRig Haskell module foobar.hs -tokens -tree -gui