project_LexerBase.js missing from generated files

[CarbonMan]

Hi,
When I run
java org.antlr.v4.Tool -Dlanguage=JavaScript PythonParser.g4

PythonLexer.js is generated, however, it has the line

import PythonLexerBase from './PythonLexerBase.js';

but PythonLexerBase.js does not exist

I am using antlr-4.13.2-complete.jar

[kaby76]

Antlr4 does not generate base class files. These are written by hand per grammar to implement the Antlr "actions" referenced in the .g4's. You are referring to one of the grammars in https://github.com/antlr/grammars-v4/tree/master/python. Please find the grammar you are using, then look for a "JavaScript/" sub-directory (ever port has a sub-directory named after the port/target) under the grammar you are using. There is the .js file. Copy the file along with all other files in JavaScript/ to the same directory where the .g4's are. If there is a "transformGrammar.py", run "python transformGrammar.py" prior to running the antlr4 tool command (fix-ups may be required for the .g4 for JavaScript).