JAVA文件中的JFlex编译错误

Question

我是JFlex的初学者。 我正在Ubuntu上工作，并已安装Java和JFlex。 java和jflex命令都可以正常工作，这意味着PATH变量已正确设置。 当我运行我的jflex文件时，它运行时没有错误，但是在运行.java文件时，它给出了一些关于sym的错误。 我的执行行如下...

jflex abc.jflex
javac -cp java-cup-0.11a.jar PascalLexer.java 

错误如下：

pratik@pratik-Lenovo-G550:~/myFlex$ javac -cp java-cup-0.11a.jar PascalLexer.java 
PascalLexer.java:663: error: cannot find symbol
          { return newSym(sym.TYPE);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:667: error: cannot find symbol
          { return newSym(sym.REAL, new Double(yytext()));
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:671: error: cannot find symbol
          { return newSym(sym.GTR);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:675: error: cannot find symbol
          { return newSym(sym.ASSMNT);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:679: error: cannot find symbol
          { return newSym(sym.ELSE);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:683: error: cannot find symbol
          { return newSym(sym.THEN);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:687: error: cannot find symbol
          { return newSym(sym.VAR);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:691: error: cannot find symbol
          { return newSym(sym.IDENT, yytext());
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:695: error: cannot find symbol
          { return newSym(sym.MINUS);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:699: error: cannot find symbol
          { return newSym(sym.SEMI);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:703: error: cannot find symbol
          { return newSym(sym.NOT_EQ);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:711: error: cannot find symbol
          { return newSym(sym.COMMA);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:715: error: cannot find symbol
          { return newSym(sym.IF);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:719: error: cannot find symbol
          { return newSym(sym.RT_PAREN);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:723: error: cannot find symbol
          { return newSym(sym.OR);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:727: error: cannot find symbol
          { return newSym(sym.EQ);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:731: error: cannot find symbol
          { return newSym(sym.RT_BRKT);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:735: error: cannot find symbol
          { return newSym(sym.DIVIDE);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:739: error: cannot find symbol
          { return newSym(sym.DOT);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:743: error: cannot find symbol
          { return newSym(sym.PROCEDURE);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:747: error: cannot find symbol
          { return newSym(sym.CHAR, new Character(yytext().charAt(1)));
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:751: error: cannot find symbol
          { return newSym(sym.LEFT_PAREN);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:755: error: cannot find symbol
          { return newSym(sym.BEGIN);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:759: error: cannot find symbol
          { return newSym(sym.END);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:763: error: cannot find symbol
          { return newSym(sym.GTR_EQ);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:767: error: cannot find symbol
          { return newSym(sym.PROGRAM);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:771: error: cannot find symbol
          { return newSym(sym.AND);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:775: error: cannot find symbol
          { return newSym(sym.ARRAY);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:779: error: cannot find symbol
          { return newSym(sym.LESS_EQ);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:783: error: cannot find symbol
          { return newSym(sym.OF);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:787: error: cannot find symbol
          { return newSym(sym.INT, new Integer(yytext()));
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:796: error: cannot find symbol
          { return newSym(sym.PLUS);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:800: error: cannot find symbol
          { return newSym(sym.LEFT_BRKT);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:804: error: cannot find symbol
          { return newSym(sym.LESS);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:813: error: cannot find symbol
          { return newSym(sym.TIMES);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:817: error: cannot find symbol
          { return newSym(sym.COLON);
                          ^
  symbol:   variable sym
  location: class PascalLexer
PascalLexer.java:824: error: cannot find symbol
              { return new java_cup.runtime.Symbol(sym.EOF); }
                                                   ^
  symbol:   variable sym
  location: class PascalLexer
37 errors

Answer 1

对于Linux：

javac -cp .*:java-cup-0.11a.jar PascalLexer.java  

对于Windows：

javac -cp .*;java-cup-0.11a.jar PascalLexer.java  

Linux类路径由:分隔，其中Windows由;分隔; 。 确保在命令中包含所需的所有库，所有库均由适当的定界符分隔。 您将必须告诉它在哪里可以找到库，因此，如果java-cup-0.11a.jar不在当前工作目录中，则需要在-cp参数中指定该文件的路径。