上一篇:1.ANTLR4 helloworld基础开发与IDEA插件使用
antlr4.7.2
package wang.xiaolei.lei;
import org.antlr.v4.runtime.tree.ErrorNode;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.RuleNode;
import org.antlr.v4.runtime.tree.TerminalNode;
/**
* 作者: wangxiaolei
* 时间: 2019/12/12
* 微信公众号:从入门到精通
* 微信:chinesedream2
*/
public class MyHelloVisitor implements HelloVisitor {
@Override
public Object visitR(HelloParser.RContext ctx) {
return null;
}
@Override
public Object visit(ParseTree tree) {
return null;
}
@Override
public Object visitChildren(RuleNode node) {
return null;
}
@Override
public Object visitTerminal(TerminalNode node) {
return null;
}
@Override
public Object visitErrorNode(ErrorNode node) {
return null;
}
}
package wang.xiaolei.lei;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
/**
* 作者: wangxiaolei
* 时间: 2019/12/12
* 微信公众号:从入门到精通
* 微信:chinesedream2
*/
public class HelloMain {
public static void main(String ...args) {
CharStream input = CharStreams.fromString("hello\tworld");
// 构造词法分析器
HelloLexer lexer=new HelloLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
// 实例化解析器
HelloParser parser = new HelloParser(tokens);
ParseTree tree = parser.r();
MyHelloVisitor myHelloVisitor = new MyHelloVisitor();
myHelloVisitor.visit(tree);
}
}
运行 HelloMain
hell\tworld
就会检测出问题