Java 如何获取antlr4错误输出?
堆栈溢出 我正在使用antlr4解析输入。 我有我的XXXX.g4语法文件,antlr4 maven插件在构建时为我生成了一些解析器代码。 我正在用该代码解析输入:Java 如何获取antlr4错误输出?,java,antlr4,Java,Antlr4,堆栈溢出 我正在使用antlr4解析输入。 我有我的XXXX.g4语法文件,antlr4 maven插件在构建时为我生成了一些解析器代码。 我正在用该代码解析输入: XXXXParser parser = new XXXXParser(new CommonTokenStream( new XXXXLexer(new ANTLRInputStream(currentInput)))); parser.command(); 在上面的代码中,“command”是我语法中规则的
XXXXParser parser = new XXXXParser(new CommonTokenStream(
new XXXXLexer(new ANTLRInputStream(currentInput))));
parser.command();
在上面的代码中,“command”是我语法中规则的名称。每次启动此代码时,如果currentInput字符串不符合语法,我会在控制台中收到一条错误消息。我希望能够捕捉这些信息并使用它们。问题是如何实现这一点?您可以编写一个实现
iantlerrorlistener
的类,然后调用parser.AddErrorListener()
并传入自定义错误列表。下面是我自己代码中的一个示例(我实际上继承了DiagnosticErrorListener
):
非常感谢你!我实际上使用的是Java,不是C#,但不管怎样,你的代码给了我正确的想法,现在一切都正常了。
public class CustomErrorListener : DiagnosticErrorListener
{
private readonly List<string> _errorMessages = new List<string>();
public IList<string> ErrorMessages { get { return _errorMessages; } }
private readonly List<string> _warningMessages = new List<string>();
public IList<string> WarningMessages { get { return _warningMessages; } }
public bool HasErrors { get { return _errorMessages.Count > 0; } }
public bool HasWarnings { get { return _warningMessages.Count > 0; } }
private readonly bool _captureDiagnostics;
public CustomErrorListener(bool captureDiagnosticWarnings)
{
_captureDiagnostics = captureDiagnosticWarnings;
}
public override void SyntaxError(IRecognizer recognizer, IToken offendingSymbol, int line, int charPositionInLine, string msg, RecognitionException e)
{
_errorMessages.Add(string.Format("line {0}:{1} {2} at: {3}", line, charPositionInLine, msg, offendingSymbol.Text));
}
public override void ReportAmbiguity(Parser recognizer, Antlr4.Runtime.Dfa.DFA dfa, int startIndex, int stopIndex, bool exact, Sharpen.BitSet ambigAlts, Antlr4.Runtime.Atn.ATNConfigSet configs)
{
if (_captureDiagnostics)
{
_warningMessages.Add(string.Format("reportAmbiguity d={0}: ambigAlts={1}, input='{2}'", GetDecisionDescription(recognizer, dfa), GetConflictingAlts(ambigAlts, configs), ((ITokenStream)recognizer.InputStream).GetText(Interval.Of(startIndex, stopIndex))));
}
}
public override void ReportAttemptingFullContext(Parser recognizer, Antlr4.Runtime.Dfa.DFA dfa, int startIndex, int stopIndex, Sharpen.BitSet conflictingAlts, Antlr4.Runtime.Atn.SimulatorState conflictState)
{
if (_captureDiagnostics)
{
_warningMessages.Add(string.Format("reportAttemptingFullContext d={0}, input='{1}'", GetDecisionDescription(recognizer, dfa), ((ITokenStream)recognizer.InputStream).GetText(Interval.Of(startIndex, stopIndex))));
}
}
public override void ReportContextSensitivity(Parser recognizer, Antlr4.Runtime.Dfa.DFA dfa, int startIndex, int stopIndex, int prediction, Antlr4.Runtime.Atn.SimulatorState acceptState)
{
if (_captureDiagnostics)
{
_warningMessages.Add(string.Format("reportContextSensitivity d={0}, input='{1}'", GetDecisionDescription(recognizer, dfa), ((ITokenStream)recognizer.InputStream).GetText(Interval.Of(startIndex, stopIndex))));
}
}
}
XXXXParser parser = new XXXXParser(new CommonTokenStream(
new XXXXLexer(new ANTLRInputStream(currentInput))));
CustomErrorListener errorListener = new CustomErrorListener(false);
parser.AddErrorListener(errorListener);
parser.command();