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I'm using antlr4 on mac os, I installed it following the getting started documentation on github https://github.com/antlr/antlr4/blob/master/doc/getting-started.md.

The testing works fine, but when enter any of these commands:

$ grun grammar rule –gui 
$ grun grammar rule –tree
$ grun grammar rule –tokens

It shows this error:

Exception in thread "main" java.nio.file.NoSuchFileException: –gui
    at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
    at java.base/sun.nio.fs.UnixFileAttributeViews$Basic.readAttributes(UnixFileAttributeViews.java:55)
    at java.base/sun.nio.fs.UnixFileSystemProvider.readAttributes(UnixFileSystemProvider.java:145)
    at java.base/java.nio.file.Files.readAttributes(Files.java:1755)
    at java.base/java.nio.file.Files.size(Files.java:2369)
    at org.antlr.v4.runtime.CharStreams.fromPath(CharStreams.java:86)
    at org.antlr.v4.gui.TestRig.process(TestRig.java:162)
    at org.antlr.v4.gui.TestRig.main(TestRig.java:119)

What could be the problem?

fullon
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1 Answers1

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Since I do not have enough reputation yet I will have to post an answer. Have you cd'ed to the correct directory where the gui file is, and run this code first?

$ antlr4 run.g4
$ javac run*.java

The Java file will not exist which would throw the NoSuchFileException since it was not compiled yet.

Another note could be that -tree is called first then gui. Have you tried running them in different order?

Lastly, I noticed that the testing in the repository has an "r" between the file and -tree or -gui. Have you tried that as well? I do not think it is anything wrong with your installation since you said that you tested it and it worked, so it must be something wrong with that Java file.

Cory Edwards
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