ANTLR cannot generate Javascript code as of version 4.5

Question

when i try to generate the listener/visitor ... for my Grammar I get the following error : ANTLR cannot generate Javascript code as of version 4.5

Does anybody knows how to fix it? I still can generate C# and Java Code.

Couldn't find any hint to that fact. Older Versions like 4.4 and 4.3 doesn't work either — Bruno, Jan 04 '16 at 10:28
https://github.com/antlr/antlr4/releases as statet here it should work — Bruno, Jan 04 '16 at 18:32

score 22 · Accepted Answer · answered Jan 08 '16 at 21:52

From the docs:

This is pretty much the same as creating a Java lexer or parser, except you need to specify the language target, for example:
$ antlr4 -Dlanguage=JavaScript MyGrammar.g4
For a full list of antlr4 tool options, please visit the tool documentation page.

It is possible that you are targeting Javascript instead of the required JavaScript (note the case); observe the difference when I execute the two:

╭─{ yaauie@celeborn:~/Desktop/tmp-20160108 }
╰─○ antlr4 -Dlanguage=JavaScript Hello.g4
[success]

╭─{ yaauie@celeborn:~/Desktop/tmp-20160108 }
╰─○ antlr4 -Dlanguage=Javascript Hello.g4
error(31):  ANTLR cannot generate Javascript code as of version 4.5.1
[error: 1]

That's right, it should be "JavaScript", with that exact capitalization. [List of language targets](https://github.com/antlr/antlr4/blob/master/doc/targets.md). — Odysseas, Apr 10 '20 at 17:09

score 2 · Answer 2 · answered Apr 10 '20 at 17:21

You need "JavaScript", not "Javascript".

The exact language values for supported languages are:

Java:

antlr4 -Dlanguage=Java MyGrammar.g4

JavaScript:

antlr4 -Dlanguage=JavaScript MyGrammar.g4

C#:

antlr4 -Dlanguage=CSharp MyGrammar.g4

Python 3:

antlr4 -Dlanguage=Python3 MyGrammar.g4

Python 2:

antlr4 -Dlanguage=Python2 MyGrammar.g4

Go:

antlr4 -Dlanguage=Go MyGrammar.g4

C++:

antlr4 -Dlanguage=Cpp MyGrammar.g4

Swift:

antlr4 -Dlanguage=Swift MyGrammar.g4

PHP:

antlr4 -Dlanguage=PHP MyGrammar.g4

Source: https://github.com/antlr/antlr4/blob/master/doc/targets.md and follow the language-specific links.

score 1 · Answer 3 · answered May 10 '18 at 06:05

I was working with ATNLR to parse hive queries in java and had a similar issue. It turns out that I was missing the case. Instead of Java I was writing java

$>antlr -Dlanguage=java Hplsql.g4 -->error(31): ANTLR cannot generate java code as of version 4.7.1

$>antlr -Dlanguage=Java Hplsql.g4 -->Success

score 1 · Answer 4 · answered May 10 '23 at 16:40

I was trying to execute:

antlr4 Arithmetic.g4 -Dlanguage=cSharp

I was getting a message:

ANTLR cannot generate cSharp code as of version 4.12.0

Just found the issue. Antlr language is CASE SENSITIVE

This works:

antlr4 Arithmetic.g4 -Dlanguage=CSharp

I hope this helps someone else.

ANTLR cannot generate Javascript code as of version 4.5

4 Answers4