Antlr 语法生成无效的 C# 代码 [英] Antlr grammar generating invalid C# code

问题描述

我正在尝试使用 ANTLR 和 StringTemplate 库开发 c# 代码生成器.AntlrWorks 可以生成 c# 解析器和词法分析器文件而不会报告任何错误.但是，c#解析器代码无效，无法在visual studio中编译.

I am trying to develop a c# code generator using ANTLR and the StringTemplate library. AntlrWorks can generate the c# parser and lexer files without reporting any errors. However, the c# parser code is not valid and cannot be compiled in visual studio.

谁能看出以下语法有什么问题?

Can anyone see what is wrong with the following grammar?

grammar StrucadShape;

options {
    language=CSharp3 ;
   output=template;  

}

@header {using System;}
@lexer::header {using System;} 
@lexer::members {const int HIDDEN = Hidden;}

/*------------------------------------------------------------------
 * PARSER RULES
 *------------------------------------------------------------------*/  

 public shapedef: parameters_def  
                  -> class_temp( parameters={$parameters_def.st} )
                  ;

 parameters_def : (PARAMETERS LPAREN (p+=param) (COMMA (p+=param))* RPAREN )
                  -> parameter_list(params={$p})
                  ;

param   : IDENTIFIER ->Parameter_decl(p={$IDENTIFIER.text});  

/*------------------------------------------------------------------
 * LEXER RULES
 *------------------------------------------------------------------*/    

fragment EOL:'\r'|'\n'|'\r\n'  ;  


 WS : (' ' 
| '\t' 
| EOL) 
{ $channel = HIDDEN; } ;    

 PARAMETERS: 'PARAMETERS';
   COMMA : ',' ;
   LPAREN : '(' ; 
   RPAREN : ')' ;  

fragment LETTER :('A'..'Z' | 'a'..'z');
IDENTIFIER: LETTER (LETTER|DIGIT)*;
INTEGER : (DIGIT)+ ;
FLOAT   : (DIGIT)+'.'(DIGIT)+;
fragment DIGIT  : '0'..'9' ;

这会在生成的 parameters_def() 方法中产生以下代码行

This results in the following lines of code in generated parameters_def() method

List<object> list_p = null;

...snipped some code

if (list_p==null) list_p=new List<StringTemplate>(); 

这在将 List 分配给类型 List