Antlr4 Win/Ubuntu 在 org.antlr.v4.gui.TestRig.main(TestRig.java:119)

Question

我使用的版本是 4.9.2 ，在 Windows10 和 Ubuntu16.04
我使用了g4
这是我的测试代码Test2.java:

class mytest {
    public void hello() {
        System.out.println("hello1");
    }

    public void hello2() {
        System.out.println("hello2");
        hello();
    }
}

public class Test2 {
    public static void main(final String[] args) throws Exception {
        mytest a = new mytest();
        a.hello();
        a.hello2();
        System.out.println("hello3");
    }
}

我可以保证这是正确的代码并且可以运行。
我先做这个

java -jar D:\lib\antlr\antlr-4.9.2-complete.jar Java8Lexer.g4
java -jar D:\lib\antlr\antlr-4.9.2-complete.jar Java8Parser.g4

然后我编译它们

javac -cp ".;D:\lib\antlr\antlr-4.9.2-complete.jar" Java*.java

None 以上错误
我想要一棵树，所以我

javac Test2.java
java -cp ".;D:\lib\antlr\antlr-4.9.2-complete.jar" org.antlr.v4.gui.TestRig Test2 r -tree

但无论我怎么尝试，我得到的结果是这样

Exception in thread "main" java.lang.ClassCastException: class Test2
        at java.lang.Class.asSubclass(Class.java:3404)
        at org.antlr.v4.gui.TestRig.process(TestRig.java:135)
        at org.antlr.v4.gui.TestRig.main(TestRig.java:119)

网上试了各种方法都没有solution.I也在Ubuntu16.04上试过，结果一样。
请大家帮我TT

Answer 1

这里有几处错误：org.antlr.v4.gui.TestRig 的参数必须是解析器名称（没有单词 Parser）和开始的规则。您有 Test2 和 r 作为参数，但这应该是 Java8 和 compilationUnit。 Test2.java 也应该完整提供。

试试这个：

Mac/Linux

java -cp .:antlr-4.9.2-complete.jar org.antlr.v4.gui.TestRig Java8 compilationUnit Test2.java -tree

Windows

java -cp .;antlr-4.9.2-complete.jar org.antlr.v4.gui.TestRig Java8 compilationUnit Test2.java -tree

打印以下内容：

(compilationUnit (typeDeclaration (classDeclaration (normalClassDeclaration class mytest (classBody { (classBodyDeclaration (classMemberDeclaration (methodDeclaration (methodModifier public) (methodHeader (result void) (methodDeclarator hello ( ))) (methodBody (block { (blockStatements (blockStatement (statement (statementWithoutTrailingSubstatement (expressionStatement (statementExpression (methodInvocation (typeName (packageOrTypeName System) . out) . println ( (argumentList (expression (assignmentExpression (conditionalExpression (conditionalOrExpression (conditionalAndExpression (inclusiveOrExpression (exclusiveOrExpression (andExpression (equalityExpression (relationalExpression (shiftExpression (additiveExpression (multiplicativeExpression (unaryExpression (unaryExpressionNotPlusMinus (postfixExpression (primary (primaryNoNewArray_lfno_primary (literal "hello1")))))))))))))))))))) ))) ;))))) }))))) (classBodyDeclaration (classMemberDeclaration (methodDeclaration (methodModifier public) (methodHeader (result void) (methodDeclarator hello2 ( ))) (methodBody (block { (blockStatements (blockStatement (statement (statementWithoutTrailingSubstatement (expressionStatement (statementExpression (methodInvocation (typeName (packageOrTypeName System) . out) . println ( (argumentList (expression (assignmentExpression (conditionalExpression (conditionalOrExpression (conditionalAndExpression (inclusiveOrExpression (exclusiveOrExpression (andExpression (equalityExpression (relationalExpression (shiftExpression (additiveExpression (multiplicativeExpression (unaryExpression (unaryExpressionNotPlusMinus (postfixExpression (primary (primaryNoNewArray_lfno_primary (literal "hello2")))))))))))))))))))) ))) ;)))) (blockStatement (statement (statementWithoutTrailingSubstatement (expressionStatement (statementExpression (methodInvocation (methodName hello) ( ))) ;))))) }))))) })))) (typeDeclaration (classDeclaration (normalClassDeclaration (classModifier public) class Test2 (classBody { (classBodyDeclaration (classMemberDeclaration (methodDeclaration (methodModifier public) (methodModifier static) (methodHeader (result void) (methodDeclarator main ( (formalParameterList (lastFormalParameter (formalParameter (variableModifier final) (unannType (unannReferenceType (unannArrayType (unannClassOrInterfaceType (unannClassType_lfno_unannClassOrInterfaceType String)) (dims [ ])))) (variableDeclaratorId args)))) )) (throws_ throws (exceptionTypeList (exceptionType (classType Exception))))) (methodBody (block { (blockStatements (blockStatement (localVariableDeclarationStatement (localVariableDeclaration (unannType (unannReferenceType (unannClassOrInterfaceType (unannClassType_lfno_unannClassOrInterfaceType mytest)))) (variableDeclaratorList (variableDeclarator (variableDeclaratorId a) = (variableInitializer (expression (assignmentExpression (conditionalExpression (conditionalOrExpression (conditionalAndExpression (inclusiveOrExpression (exclusiveOrExpression (andExpression (equalityExpression (relationalExpression (shiftExpression (additiveExpression (multiplicativeExpression (unaryExpression (unaryExpressionNotPlusMinus (postfixExpression (primary (primaryNoNewArray_lfno_primary (classInstanceCreationExpression_lfno_primary new mytest ( )))))))))))))))))))))))) ;)) (blockStatement (statement (statementWithoutTrailingSubstatement (expressionStatement (statementExpression (methodInvocation (typeName a) . hello ( ))) ;)))) (blockStatement (statement (statementWithoutTrailingSubstatement (expressionStatement (statementExpression (methodInvocation (typeName a) . hello2 ( ))) ;)))) (blockStatement (statement (statementWithoutTrailingSubstatement (expressionStatement (statementExpression (methodInvocation (typeName (packageOrTypeName System) . out) . println ( (argumentList (expression (assignmentExpression (conditionalExpression (conditionalOrExpression (conditionalAndExpression (inclusiveOrExpression (exclusiveOrExpression (andExpression (equalityExpression (relationalExpression (shiftExpression (additiveExpression (multiplicativeExpression (unaryExpression (unaryExpressionNotPlusMinus (postfixExpression (primary (primaryNoNewArray_lfno_primary (literal "hello3")))))))))))))))))))) ))) ;))))) }))))) })))) <EOF>)

Antlr4 Win/Ubuntu 在 org.antlr.v4.gui.TestRig.main(TestRig.java:119)

Antlr4 Win/Ubuntu at org.antlr.v4.gui.TestRig.main(TestRig.java:119)

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