antlr4 和 python 中的 Javascript 语法

如何解决antlr4 和 python 中的 Javascript 语法

我使用了以下 JavaScript 语法链接。

https://github.com/antlr/grammars-v4/tree/master/javascript/javascript/Python

我使用过 antlr4.8 和 ntlr4-python3-runtime==4.8。当我使用以下代码时，它会出现以下错误。
错误：

PS N:\antlr4\sample\py4.8> python main.py test.js
Running
Test started for: test.js
Created parsers
Traceback (most recent call last):
  File "main.py",line 25,in <module>
    main(sys.argv)
  File "main.py",line 20,in main
    tree = parser.program()
  File "N:\antlr4\sample\py4.8\JavaScriptParser.py",line 880,in program
    self.enterRule(localctx,self.RULE_program)
  File "C:\Users\root\AppData\Local\Programs\Python\python38\lib\site-packages\antlr4\Parser.py",line 366,in enterRule
    self._ctx.start = self._input.LT(1)
.
.
.
  File "N:\antlr4\sample\py4.8\JavaScriptLexer.py",line 919,in sempred
    return pred(localctx,predindex)
  File "N:\antlr4\sample\py4.8\JavaScriptLexer.py",line 925,in HashBangLine_sempred
    return  this.IsstartOfFile()
NameError: name 'this' is not defined

代码：

import sys
from antlr4 import *
import JavaScriptLexer
import JavaScriptParser

JSL = JavaScriptLexer.JavaScriptLexer
JSP = JavaScriptParser.JavaScriptParser

class WriteTreeListener(ParseTreeListener):
    def visitTerminal(self,node:TerminalNode):
        print ("Visit Terminal: " + str(node) + " - " + repr(node))

def main(argv):
    input_stream = FileStream(argv[1])
    print("Test started for: " + argv[1])
    lexer = JSL(input_stream)
    stream = CommonTokenStream(lexer)
    parser = JSP(stream)
    print("Created parsers")
    tree = parser.program()
    ParseTreeWalker.DEFAULT.walk(WriteTreeListener(),tree)

if __name__ == '__main__':
    print("Running")
    main(sys.argv)

print("Hello")

我做错了什么？