bnfc漂亮打印机java错误

Question

我有一个BNFC文件描述了一个由许多部分组成的配置文件，每个部分在[]之间都有一个名称，后面是一个简单声明列表

comment "#";
rulse Boolean ::= "True" | "False";
Conf. Config ::= [Section];  //a config is a list of sections
terminator Section "";

Sec. Section ::= "[" NomeSec "]" [Decl]; //A section is made of a name and a list of declarations
terminator Decl ";";

NomeSez. NomeSec ::= Ident;

Dec. Decl ::= VarN "=" Type;

VarName. VarN ::= Ident;

Int.    Type::=Integer;
Char.   Type::=Char;
String. Type::=String;
Float.  Type::=Double;
Bool.   Type::=Boolean;

示例：

[Section1]
Var1 = 3;
Var2 = "test";
#ignored comment

[SectionA]
var4 = True;

有一个未定义的节和声明的数目。

我从shell中运行了命令bnfc -m -java <filename>，从漂亮的打印机运行了一个部件，一切正常。当编译prettyprinter.java的时候会产生大量的错误。例如：

ES5/PrettyPrinter.java:10: error: reference to String is ambiguos 
private static final String _L_PAREN = new String("("); both class
ES5.Absyn.String  and class java.lang.String in java.lang match

所有的错误都是这种类型的。我想知道，我刚刚构建了语法，我失败了语法，还是BNFC失败了？谢谢

Answer 1

因为BNFC为每个类别和标签创建java类，如果使用java.lang中的名称，则会产生歧义(例如String、Boolean.)。

它适用于以下重命名(我还添加了一个显式入口点)：

entrypoints Config;

comment "#";
rules MyBoolean ::= "True" | "False";
Conf. Config ::= [Section];  -- a config is a list of sections
terminator Section "";

Sec. Section ::= "[" NomeSec "]" [Decl]; -- A section is made of a name and a list of declarations
terminator Decl ";";

NomeSez. NomeSec ::= Ident;

Dec. Decl ::= VarN "=" Type;

VarName. VarN ::= Ident;

TInt.    Type::=Integer;
TChar.   Type::=Char;
TString. Type::=String;
TFloat.  Type::=Double;
TBool.   Type::=MyBoolean;