我正在尝试在 Mono 上的 C# 中使用 ANTLR 4.5.3 解析器(从 macOS 10.11.3 上的 Xamarin Studio 6.1.2 运行),但是 antlr4
生成的代码Java 命令行工具有一个错误导致无法编译。
我的语法如下:
grammar Hello;
HELLO: 'hello';
WORD: [a-z]+;
greeting: HELLO WORD;
WS: [ \n\t\r]+ -> skip;
当语法通过antlr4
时没有错误或警告,但在 Xamarin Studio 中编译生成的 HelloParser
类失败:
Error CS0534:
HelloParser
does not implement inherited abstract memberAntlr4.Runtime.Recognizer<Antlr4.Runtime.IToken,Antlr4.Runtime.Atn.ParserATNSimulator>.TokenNames.get
(CS0534)
我已经拿到了对应的ANTLR 4.5.3 NuGet包,没有其他错误。生成的解析器类的其余部分似乎没问题。 (生成一个 GreetingContext
类和一个 HelloParser.greeting
方法。)
为什么 ANTLR 没有生成这个方法,我该如何修复这个错误?
如果需要,这里是 HelloParser.cs
的全部内容文件:
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// ANTLR Version: 4.5.3
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
// Generated from Hello.g4 by ANTLR 4.5.3
// Unreachable code detected
#pragma warning disable 0162
// The variable '...' is assigned but its value is never used
#pragma warning disable 0219
// Missing XML comment for publicly visible type or member '...'
#pragma warning disable 1591
// Ambiguous reference in cref attribute
#pragma warning disable 419
using System;
using System.Text;
using System.Diagnostics;
using System.Collections.Generic;
using Antlr4.Runtime;
using Antlr4.Runtime.Atn;
using Antlr4.Runtime.Misc;
using Antlr4.Runtime.Tree;
using DFA = Antlr4.Runtime.Dfa.DFA;
[System.CodeDom.Compiler.GeneratedCode("ANTLR", "4.5.3")]
[System.CLSCompliant(false)]
public partial class HelloParser : Parser {
public const int
HELLO=1, WORD=2, WS=3;
public const int
RULE_greeting = 0;
public static readonly string[] ruleNames = {
"greeting"
};
private static readonly string[] _LiteralNames = {
null, "'hello'"
};
private static readonly string[] _SymbolicNames = {
null, "HELLO", "WORD", "WS"
};
public static readonly IVocabulary DefaultVocabulary = new Vocabulary(_LiteralNames, _SymbolicNames);
[NotNull]
public override IVocabulary Vocabulary
{
get
{
return DefaultVocabulary;
}
}
public override string GrammarFileName { get { return "Hello.g4"; } }
public override string[] RuleNames { get { return ruleNames; } }
public override string SerializedAtn { get { return _serializedATN; } }
public HelloParser(ITokenStream input)
: base(input)
{
Interpreter = new ParserATNSimulator(this,_ATN);
}
public partial class GreetingContext : ParserRuleContext {
public ITerminalNode HELLO() { return GetToken(HelloParser.HELLO, 0); }
public ITerminalNode WORD() { return GetToken(HelloParser.WORD, 0); }
public GreetingContext(ParserRuleContext parent, int invokingState)
: base(parent, invokingState)
{
}
public override int RuleIndex { get { return RULE_greeting; } }
public override void EnterRule(IParseTreeListener listener) {
IHelloListener typedListener = listener as IHelloListener;
if (typedListener != null) typedListener.EnterGreeting(this);
}
public override void ExitRule(IParseTreeListener listener) {
IHelloListener typedListener = listener as IHelloListener;
if (typedListener != null) typedListener.ExitGreeting(this);
}
}
[RuleVersion(0)]
public GreetingContext greeting() {
GreetingContext _localctx = new GreetingContext(Context, State);
EnterRule(_localctx, 0, RULE_greeting);
try {
EnterOuterAlt(_localctx, 1);
{
State = 2; Match(HELLO);
State = 3; Match(WORD);
}
}
catch (RecognitionException re) {
_localctx.exception = re;
ErrorHandler.ReportError(this, re);
ErrorHandler.Recover(this, re);
}
finally {
ExitRule();
}
return _localctx;
}
private static string _serializedATN = _serializeATN();
private static string _serializeATN()
{
StringBuilder sb = new StringBuilder();
sb.Append("\x3\x430\xD6D1\x8206\xAD2D\x4417\xAEF1\x8D80\xAADD\x3\x5");
sb.Append("\b\x4\x2\t\x2\x3\x2\x3\x2\x3\x2\x3\x2\x2\x2\x3\x2\x2\x2\x6\x2");
sb.Append("\x4\x3\x2\x2\x2\x4\x5\a\x3\x2\x2\x5\x6\a\x4\x2\x2\x6\x3\x3\x2");
sb.Append("\x2\x2\x2");
return sb.ToString();
}
public static readonly ATN _ATN =
new ATNDeserializer().Deserialize(_serializedATN.ToCharArray());
}
如果您需要任何其他生成的文件,请发表评论,以防您自己的 ANTLR 无法重现该错误。
最佳答案
NuGet 包使用 Sam Harwell's optimized C# target而不是标准的。您不能将一个版本的工具与另一个版本的运行时库一起使用,它们不兼容:查看 release notes here .
因此,如果您想继续使用 NuGet 包以方便使用,您可以使用其中的工具 - 该包只是一个 zip 文件。
我不知道您是否可以使用 Xamarin Studio 简化此工作流,但使用 Visual Studio 您可以完全跳过手动解析器生成步骤,因为该包与 MSBuild 集成以在编译时生成解析器代码。
关于C# ANTLR 解析器没有实现继承的抽象成员 TokenNames.get,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41401518/