当我尝试用ANTLR4生成C＃时会出现这些奇怪的错误是什么？(What are these odd errors that occur when I attempt to generate C# wi

我（现在）试图使用ANTLR4和C＃来设计一种语言，到目前为止我一直在摆弄它。 在这个过程中，我决定尝试创建一个简单的数学表达式求值器。 在这个过程中，我为它创建了以下ANTLR语法：

grammar Calculator;

@parser::members
{
    protected const int EOF = Eof;
}

@lexer::members
{
    protected const int EOF = EOF;
    protected const int HIDDEN = Hidden;
}

program : expr+ ;

expr : expr op=('*' | '/') expr
     | expr op=('+' | '-') expr
     | INT
     | '(' expression ')'
     ;

INT : [0-9]+ ;
MUL : '*' ;
DIV : '/' ;
ADD : '+' ;
SUB : '-' ;
WS : (' ' | '\r' | '\n') -> channel(HIDDEN) ;
 
 当我尝试使用此命令从它生成C＃代码时： 
 
 
 java -jar C:\...\antlr-4.2-complete.jar -DLanguage=CSharp .\...\Grammar.g4
 
 
 我得到这些奇怪的错误： 
 
 
 error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:0: syntax error: 'ï' came as a complete surprise to me    
error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:1: syntax error: '»' came as a complete surprise to me    
error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:2: syntax error: '¿' came as a complete surprise to me  
error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:3: syntax error: mismatched input 'grammar' expecting SEMI
 
 
 什么可能会导致这些错误，我该如何解决它们？ 我现在最好的猜想是，Visual Studio将奇数字符插入到文件的开头，并且我无法删除它们。 
I'm (now) trying to use ANTLR4 and C# to design a language, and so far I've been fiddling around with it. In the process, I decided to try and create a simple mathematical expression evaluator. In the process, I created the following ANTLR grammar for it:
 
grammar Calculator;

@parser::members
{
    protected const int EOF = Eof;
}

@lexer::members
{
    protected const int EOF = EOF;
    protected const int HIDDEN = Hidden;
}

program : expr+ ;

expr : expr op=('*' | '/') expr
     | expr op=('+' | '-') expr
     | INT
     | '(' expression ')'
     ;

INT : [0-9]+ ;
MUL : '*' ;
DIV : '/' ;
ADD : '+' ;
SUB : '-' ;
WS : (' ' | '\r' | '\n') -> channel(HIDDEN) ;
 
When I try to generate C# code from it using this command:
 
 
 java -jar C:\...\antlr-4.2-complete.jar -DLanguage=CSharp .\...\Grammar.g4
 
 
I get these odd errors:
 
 
 error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:0: syntax error: 'ï' came as a complete surprise to me    
error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:1: syntax error: '»' came as a complete surprise to me    
error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:2: syntax error: '¿' came as a complete surprise to me  
error(50): C:\Users\Ethan\Documents\Visual Studio 2015\Projects\CypressLang\CypressLang\Source\.\Grammar\CypressGrammar.g4:1:3: syntax error: mismatched input 'grammar' expecting SEMI
 
 
What might be causing these errors, and how can I fix them? My best guess at the moment is that Visual Studio is inserting odd characters onto the beginning of the file, and I can't remove them.
                
最满意答案
                
                    
                        
 今天不是一个好日子。 
 
 Visual Studio决定与我混淆并将我的所有文件的文件格式更改为UTF-8。 我需要做的就是进入File > Advanced Save Settings ，并将编码更改为US-ASCII。 这删除了开头插入的奇怪字符，并解决了（大部分）我的问题。 
Today is not a good day.
 
Visual Studio decided to mess with me and change my file formats to UTF-8 for all of my files. All I needed to do was go to File > Advanced Save Settings, and change the encoding to US-ASCII. This removed the odd characters inserted at the beginning, and solved (most) of my problems.