ANTLR版本不兼容：LabLexer构造器参数类型匹配失败求助

方案1：编写流类型适配器类 #

如果无法修改现有创建ANTLRInputStream（ANTLR3）和LabLexer实例的代码逻辑，可以编写一个适配器类，将ANTLR3的流包装成ANTLR4要求的CharStream接口实现：

import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.runtime.ANTLRInputStream;

public class ANTLR3To4StreamAdapter implements CharStream {
    private final CharStream delegateStream;
    private final ANTLRInputStream antlr3Stream;

    public ANTLR3To4StreamAdapter(ANTLRInputStream antlr3Stream) {
        this.antlr3Stream = antlr3Stream;
        // 将ANTLR3流的内容转换为ANTLR4的CharStream
        this.delegateStream = CharStreams.fromString(antlr3Stream.toString());
    }

    // 委托所有CharStream接口方法给内部的ANTLR4流
    @Override
    public String getText(org.antlr.v4.runtime.misc.Interval interval) {
        return delegateStream.getText(interval);
    }

    @Override
    public void consume() {
        delegateStream.consume();
    }

    @Override
    public int LA(int i) {
        return delegateStream.LA(i);
    }

    @Override
    public int mark() {
        return delegateStream.mark();
    }

    @Override
    public void release(int marker) {
        delegateStream.release(marker);
    }

    @Override
    public int index() {
        return delegateStream.index();
    }

    @Override
    public void seek(int index) {
        delegateStream.seek(index);
    }

    @Override
    public int size() {
        return delegateStream.size();
    }

    @Override
    public String getSourceName() {
        return delegateStream.getSourceName();
    }

    // 保留ANTLR3流的行号和列号信息
    @Override
    public int getLine() {
        return antlr3Stream.getLine();
    }

    @Override
    public int getCharPositionInLine() {
        return antlr3Stream.getCharPositionInLine();
    }
}

然后在创建LabLexer时，用适配器包装原有的input实例：

ANTLRInputStream input = new ANTLRInputStream(...);
LabLexer lexer = new LabLexer(new ANTLR3To4StreamAdapter(input));

方案2：统一ANTLR版本依赖 #

如果项目中同时引入了ANTLR3和ANTLR4的依赖，可尝试统一为ANTLR4：

• 移除ANTLR3相关依赖，确保所有代码依赖ANTLR4的库
• 将org.antlr.runtime.ANTLRInputStream替换为ANTLR4的流实现（推荐使用CharStreams，或兼容的org.antlr.v4.runtime.ANTLRInputStream）：

  // 替换原ANTLR3的输入流创建代码
  org.antlr.v4.runtime.CharStream input = CharStreams.fromStream(...);
  LabLexer lexer = new LabLexer(input);
  

如果无法直接修改代码，可通过调整项目依赖排除规则，确保LabLexer使用的ANTLR4依赖优先级高于ANTLR3，避免类加载冲突。

内容的提问来源于stack exchange，提问作者ananas1kk