Example usage for org.antlr.v4.runtime Parser getRuleInvocationStack

Introduction

In this page you can find the example usage for org.antlr.v4.runtime Parser getRuleInvocationStack.

Prototype

public List<String> getRuleInvocationStack() 

Source Link

Document

Return List<String> of the rule names in your parser instance leading up to a call to the current rule.

Usage

From source file:net.certiv.json.parser.JsonErrorListener.java

License:Open Source License

@Override
public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine,
        String msg, RecognitionException e) {

    Parser parser = (Parser) recognizer;
    String name = parser.getSourceName();
    TokenStream tokens = parser.getInputStream();

    Token offSymbol = (Token) offendingSymbol;
    int thisError = offSymbol.getTokenIndex();
    if (offSymbol.getType() == -1 && thisError == tokens.size() - 1) {
        Log.debug(this, name + ": Incorrect error: " + msg);
        return;//from w ww.j a  v  a  2s  . co m
    }
    String offSymName = JsonLexer.VOCABULARY.getSymbolicName(offSymbol.getType());
    if (thisError > lastError + 10) {
        lastError = thisError - 10;
    }
    for (int idx = lastError + 1; idx <= thisError; idx++) {
        Token token = tokens.get(idx);
        if (token.getChannel() != Token.HIDDEN_CHANNEL)
            Log.error(this, name + ":" + token.toString());
    }
    lastError = thisError;

    List<String> stack = parser.getRuleInvocationStack();
    Collections.reverse(stack);

    Log.error(this, name + " rule stack: " + stack);
    Log.error(this, name + " line " + line + ":" + charPositionInLine + " at " + offSymName + ": " + msg);
}

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