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我有这个 BNFC 文件描述了一个由许多部分组成的配置文件,其中每个部分的名称在 [] 之间,后跟一个简单声明列表

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;

例子:

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

[SectionA]
var4 = True;

具有未定义数量的部分和声明。

我从 shell 运行了命令bnfc -m -java <filename>,一切都很好,部分来自漂亮的打印机。当编译 prettyprinter.java 时会产生大量错误。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

所有的错误都属于这种类型。我想知道,我刚刚建立了语法,我的语法失败了还是 BNFC 失败了?谢谢

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1 回答 1

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

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;
于 2016-06-05T15:29:46.727 回答