Antlr Error Handling C#
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Antlr Java
Join them; it only takes a minute: Sign up How to control error handling and synchronization in Antlr 4 / c# up vote 0 down vote favorite 1 I'm using Antlr 4 with c# target. Here is a subset of my grammar: /* * Parser Rules */ text : term+ EOF; term : a1 a2 a3; a1: .... ... antlr visual studio ... I want to accept valid data blocks as (term)s, when error exists I want to search for the next valid term and print out the whole text which caused the error for user to analyze manually. How to synchronize input to the next valid term? and How to get the ignored text? antlr grammar antlr4 share|improve this question edited Aug 31 '13 at 16:07 I4V 27k33058 asked Aug 31 '13 at 16:04 Lio 518 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote You will need to create your own implementation of IAntlrErrorStrategy for this, and then set the Parser.ErrorHandler property to an instance of your error strategy. The documentation for the Java versions of the ANTLRErrorStrategy interface and default implementation DefaultErrorStrategy may provide useful information for implementing an error strategy, but I must warn you going in that creating a custom error strategy is an advanced feature with limited documentation. It's expected that the implementer is already an expert in ANTLR 4's implementation of the Adaptive LL
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Antlr Error Handling Example
community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to collect errors during run time given by a parser in Antlr4 up vote http://stackoverflow.com/questions/18550031/how-to-control-error-handling-and-synchronization-in-antlr-4-c-sharp 3 down vote favorite I have upgraded from Antlr 3 to Antlr 4. I was using this code to catch exceptions using this code. But this is not working for Antlr 4. partial class XParser { public override void ReportError(RecognitionException e) { base.ReportError(e); Console.WriteLine("Error in Parser at line " + ":" + e.OffendingToken.Column + e.OffendingToken.Line + e.Message); } } This is the error that appears 'Parser.ReportError(Antlr4.Runtime.RecognitionException)': no suitable method found to http://stackoverflow.com/questions/18484869/how-to-collect-errors-during-run-time-given-by-a-parser-in-antlr4 override In Antlr 4 what is the expected way of accumulating errors that occurs in the input stream. I was unable to find a way to achieve this on the net. Please provide me some guidelines. EDIT: I have implemented the XParser as below partial class XParser : IAntlrErrorListener
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site http://stackoverflow.com/questions/37126574/in-antlr4-c-error-handling-isnt-getting-fired-as-expected About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up In Antlr4, C#, error handling Error Handling isn't getting fired as expected up vote 6 down vote favorite In Antlr 4, I have a grammar which takes strings of format x*Y, x+y, etc I want to catch an error when an invalid operator is used, such as x&y. If I add code like: parser.RemoveErrorListeners(); parser.AddErrorListener(new MyErrorListener()); And define MyErrorListener as : public class MyErrorListener : BaseErrorListener { public override void antlr error handling SyntaxError(IRecognizer recognizer, IToken offendingSymbol, int line, int charPositionInLine, string msg, RecognitionException e) { ... SyntaxError isn't called in the X&Y case....but will be called in the X& case... I am thoroughly confused, as the console listener will show an error for both forms, yet my custom one won't. All I really want to be able to do is say "If there is a parsing error of any kind, do x" but I can't seem to figure this out. Help! Here is part of the grammar btw: equation : boolEquation (op=(AND|OR) boolEquation)* ; boolEquation : NOT? boolExpression ; boolExpression : left=expression (op=relop right=expression)? #BoolExpressionMatch ; expression : name=ID LPAREN expList=expressionList RPAREN #FunctionMatch | left=expression op=(TIMES | DIV | MODULUS) right=expression # ExpressionMatch | left=expression op=(PLUS | MINUS) right=expression #ExpressionMatch | LPAREN expression RPAREN #ParenthesizedExpressionMatch | atom #AtomMatch ; atom : number #NumberMatch | string #StringMatch | variable #AtomVariableMatch | unaryValue #UnaryValueMatch | boolean #BooleanMatch ; string : ID ; boolean : TRUE | FALSE; unaryValue : EMPTY | PRESENT ; func : name=ID LPAREN expList=expressionList RPAREN ; expressionList : (expression (COMMA expression)*)? ; variable : WORD(POINT WORD)* #VariableMatch ; ... Interestingly enough, even wh