导入后ANTLR4语法标记识别错误

我使用parser grammar和lexer grammar来自GitHub的antlr4来解析Python3中的PHP .

当我直接使用这些语法时，我的PoC代码可以工作：

antlr-test.py

from antlr4 import *
# from PHPParentLexer import PHPParentLexer
# from PHPParentParser import PHPParentParser
# from PHPParentParser import PHPParentListener

from PHPLexer import PHPLexer as PHPParentLexer
from PHPParser import PHPParser as PHPParentParser
from PHPParser import PHPParserListener as PHPParentListener


class PhpGrammarListener(PHPParentListener):
    def enterFunctionInvocation(self, ctx):
        print("enterFunctionInvocation " + ctx.getText())


if __name__ == "__main__":
    scanner_input = FileStream('test.php')
    lexer = PHPParentLexer(scanner_input)
    stream = CommonTokenStream(lexer)
    parser = PHPParentParser(stream)
    tree = parser.htmlDocument()
    walker = ParseTreeWalker()
    printer = PhpGrammarListener()
    walker.walk(printer, tree)

它给出了输出

/opt/local/bin/python3.4 /Users/d/PycharmProjects/name/antlr-test.py
enterFunctionInvocation echo("hi") 
enterFunctionInvocation another_method("String")
enterFunctionInvocation print("print statement")

Process finished with exit code 0

当我使用以下PHPParent.g4语法时，我收到很多错误：

grammar PHPParent;
options { tokenVocab=PHPLexer; }
import PHPParser;

在交换关于pythons导入的注释后，我收到此错误

/opt/local/bin/python3.4 /Users/d/PycharmProjects/name/antlr-test.py
line 1:1 token recognition error at: '?'
line 1:2 token recognition error at: 'p'
line 1:3 token recognition error at: 'h'
line 1:4 token recognition error at: 'p'
line 1:5 token recognition error at: '\n'
...
line 2:8 no viable alternative at input '<('
line 2:14 mismatched input ';' expecting {<EOF>, '<', '{', '}', ')', '?>', 'list', 'global', 'continue', 'return', 'class', 'do', 'switch', 'function', 'break', 'if', 'for', 'foreach', 'while', 'new', 'clone', '&', '!', '-', '~', '@', '$', <INVALID>, 'Interface', 'abstract', 'static', Array, RequireOperator, DecimalNumber, HexNumber, OctalNumber, Float, Boolean, SingleQuotedString, DoubleQuotedString_Start, Identifier, IncrementOperator}
line 3:28 mismatched input ';' expecting {<EOF>, '<', '{', '}', ')', '?>', 'list', 'global', 'continue', 'return', 'class', 'do', 'switch', 'function', 'break', 'if', 'for', 'foreach', 'while', 'new', 'clone', '&', '!', '-', '~', '@', '$', <INVALID>, 'Interface', 'abstract', 'static', Array, RequireOperator, DecimalNumber, HexNumber, OctalNumber, Float, Boolean, SingleQuotedString, DoubleQuotedString_Start, Identifier, IncrementOperator}
line 4:28 mismatched input ';' expecting {<EOF>, '<', '{', '}', ')', '?>', 'list', 'global', 'continue', 'return', 'class', 'do', 'switch', 'function', 'break', 'if', 'for', 'foreach', 'while', 'new', 'clone', '&', '!', '-', '~', '@', '$', <INVALID>, 'Interface', 'abstract', 'static', Array, RequireOperator, DecimalNumber, HexNumber, OctalNumber, Float, Boolean, SingleQuotedString, DoubleQuotedString_Start, Identifier, IncrementOperator}

但是，在语法上运行antlr4工具时，我没有遇到任何错误 . 我被困在这里 - 可能导致这个问题的原因是什么？

$ a4p PHPLexer.g4
warning(146): PHPLexer.g4:363:0: non-fragment lexer rule DoubleQuotedStringBody can match the empty string
$ a4p PHPParser.g4
warning(154): PHPParser.g4:523:0: rule doubleQuotedString contains an optional block with at least one alternative that can match an empty string
$ a4p PHPParent.g4
warning(154): PHPParent.g4:523:0: rule doubleQuotedString contains an optional block with at least one alternative that can match an empty string