Java ANTLR:找不到符号
我有一个名为“Test.g4”的ANTLR项目,我使用antlrworks2毫无问题地创建了文件:Test.tokens、TestBaseListner.java、TestLexer.java、TestLexer.tokens、TestListener.java和TestParser.java 现在我想在程序Test.java中使用语法:Java ANTLR:找不到符号,java,parsing,antlr,javac,Java,Parsing,Antlr,Javac,我有一个名为“Test.g4”的ANTLR项目,我使用antlrworks2毫无问题地创建了文件:Test.tokens、TestBaseListner.java、TestLexer.java、TestLexer.tokens、TestListener.java和TestParser.java 现在我想在程序Test.java中使用语法: import org.antlr.v4.runtime.*; import org.antlr.v4.runtime.tree.*; public clas
import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.tree.*;
public class Test {
public static void main(String[] args) throws Exception {
// create a CharStream that reads from standard input
ANTLRInputStream input = new ANTLRInputStream(System.in);
// create a lexer that feeds off of input CharStream
TestLexer lexer = new TestLexer(input);
// create a buffer of tokens pulled from the lexer
CommonTokenStream tokens = new CommonTokenStream(lexer);
// create a parser that feeds off the tokens buffer
TestParser parser = new TestParser(tokens);
ParseTree tree = parser.init(); // begin parsing at init rule
System.out.println(tree.toStringTree(parser)); // print LISP-style tree
}
}
当我尝试使用“javac-classpath/path/java2/antlr-4.4-complete.jartest.java”
编译它时,我得到以下错误:
Test.java:19: error: cannot find symbol
TestLexer lexer = new TestLexer(input);
^
symbol: class TestLexer
location: class Test
Test.java:19: error: cannot find symbol
TestLexer lexer = new TestLexer(input);
^
symbol: class TestLexer
location: class Test
Test.java:25: error: cannot find symbol
TestParser parser = new TestParser(tokens);
^
symbol: class TestParser
location: class Test
Test.java:25: error: cannot find symbol
TestParser parser = new TestParser(tokens);
^
symbol: class TestParser
location: class Test
4 errors
谢谢大家! 您需要构建并导入由ANTLR生成的词法分析器和解析器。要做到这一点,您需要:
TestLexer.java
和TestParser.java
也应该在同一个命令中使用Test.java
进行编译,否则编译器将不知道在哪里查找它们的二进制文件。尝试调用javac
,如下所示:
javac -classpath /path/java2/antlr-4.4-complete.jar *java
或手动传递所有文件:
javac -classpath /path/java2/antlr-4.4-complete.jar Test.java TestLexer.java TestParser.java
如果您的文件名为
Sample.java
,那么您的类名也必须是Sample
而不是Test
TestLexer.java是否与Test.java在同一个包中?