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
– Bruno, Commented Jan 4, 2016 at 10:28
github.com/antlr/antlr4/releases as statet here it should work — Bruno
– Bruno, Commented Jan 4, 2016 at 18:32

Rye Biesemeyer · Accepted Answer · 2016-01-08 21:52:29Z

22

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]

answered Jan 8, 2016 at 21:52

Rye Biesemeyer

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1 Comment

Odysseas Over a year ago

That's right, it should be "JavaScript", with that exact capitalization. List of language targets.

Odysseas · Accepted Answer · 2020-04-10 17:21:45Z

3

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.

answered Apr 10, 2020 at 17:21

Odysseas

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Comments

Ujjwal · Accepted Answer · 2018-05-10 06:05:44Z

1

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

answered May 10, 2018 at 6:05

Ujjwal

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KeithMacCrimmon · Accepted Answer · 2023-05-10 16:40:15Z

1

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.

answered May 10, 2023 at 16:40

KeithMacCrimmon

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