Examples of org.antlr.v4.runtime.ParserRuleContext

org.antlr.v4.runtime.atn.RuleStartState
A rule invocation record for parsing. Contains all of the information about the current rule not stored in the RuleContext. It handles parse tree children list, Any ATN state tracing, and the default values available for rule indications: start, stop, rule index, current alt number, current ATN state. Subclasses made for each rule and grammar track the parameters, return values, locals, and labels specific to that rule. These are the objects that are returned from rules. Note text is not an actual field of a rule return value; it is computed from start and stop using the input stream's toString() method. I could add a ctor to this so that we can pass in and store the input stream, but I'm not sure we want to do that. It would seem to be undefined to get the .text property anyway if the rule matches tokens from multiple input streams. I do not use getters for fields of objects that are used simply to group values such as this aggregate. The getters/setters are there to satisfy the superclass interface.

      if ( diag ) parser.addErrorListener(new DiagnosticErrorListener());
      if ( bail ) parser.setErrorHandler(new BailErrorStrategy());
      if ( SLL ) parser.getInterpreter().setPredictionMode(PredictionMode.SLL);


      // start parsing at the compilationUnit rule
      ParserRuleContext t = parser.compilationUnit();
      if ( notree ) parser.setBuildParseTree(false);
      if ( gui ) t.inspect(parser);
      if ( printTree ) System.out.println(t.toStringTree(parser));
    }
    catch (Exception e) {
      System.err.println("parser exception: "+e);
      e.printStackTrace();   // so we can get stack trace
    }

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                    } else {
                        trimLeft = prev instanceof DirectiveContext;
                        if (trimLeft) {
                            // inline directive, 对于一个内联的 #if, #for 指令，后面有要求保留一个 NewLine
                            // @see https://github.com/subchen/jetbrick-template/issues/25
                            ParserRuleContext directive = (ParserRuleContext) ((DirectiveContext) prev).getChild(0);
                            if (directive instanceof If_directiveContext || directive instanceof For_directiveContext) {
                                if (directive.getStart().getLine() == directive.getStop().getLine()) {
                                    keepLeftNewLine = true; // 保留一个 NewLine
                                }
                            }
                        }
                    }

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    }


    // 检验 ctx 必须在 #for 里面, 但不能在 for-else 里面
    private void assert_inside_of_for_directive(ParserRuleContext ctx, String name) {
        // 还有一种方法，直接看 forStack 是否为空就可以了
        ParserRuleContext p = ctx.getParent();
        while (p != null) {
            if (p instanceof For_directiveContext) {
                return;
            }
            if (p instanceof Else_directiveContext) {
                // 跳过可能的  for-else 的情况, 继续向上查找
                // 当然如果时候 if-else 的情况, 也可以跳过这个 #if，没有问题
                p = p.getParent();
            }
            p = p.getParent();
        }
        throw reportError(name + " cannot be used outside of a #for directive", ctx);
    }

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    for (GrammarAST t : terminals) {
      int ttype = g.getTokenType(t.getText());
      set.add(ttype);
    }
    if ( invert ) {
      left.addTransition(new NotSetTransition(right, set));
    }
    else {
      left.addTransition(new SetTransition(right, set));
    }
    associatedAST.atnState = left;

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        BlockStartState star = newState(StarBlockStartState.class, ebnfRoot);
        if ( alts.size()>1 ) atn.defineDecisionState(star);
        h = makeBlock(star, blkAST, alts);
        return star(ebnfRoot, h);
      case ANTLRParser.POSITIVE_CLOSURE :
        PlusBlockStartState plus = newState(PlusBlockStartState.class, ebnfRoot);
        if ( alts.size()>1 ) atn.defineDecisionState(plus);
        h = makeBlock(plus, blkAST, alts);
        return plus(ebnfRoot, h);
    }
    return null;

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   * start.
   */
  @NotNull
  @Override
  public Handle plus(@NotNull GrammarAST plusAST, @NotNull Handle blk) {
    PlusBlockStartState blkStart = (PlusBlockStartState)blk.left;
    BlockEndState blkEnd = (BlockEndState)blk.right;
    preventEpsilonClosureBlocks.add(new Triple<Rule, ATNState, ATNState>(currentRule, blkStart, blkEnd));


    PlusLoopbackState loop = newState(PlusLoopbackState.class, plusAST);
    loop.nonGreedy = !((QuantifierAST)plusAST).isGreedy();

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  public Handle plus(@NotNull GrammarAST plusAST, @NotNull Handle blk) {
    PlusBlockStartState blkStart = (PlusBlockStartState)blk.left;
    BlockEndState blkEnd = (BlockEndState)blk.right;
    preventEpsilonClosureBlocks.add(new Triple<Rule, ATNState, ATNState>(currentRule, blkStart, blkEnd));


    PlusLoopbackState loop = newState(PlusLoopbackState.class, plusAST);
    loop.nonGreedy = !((QuantifierAST)plusAST).isGreedy();
    atn.defineDecisionState(loop);
    LoopEndState end = newState(LoopEndState.class, plusAST);
    blkStart.loopBackState = loop;
    end.loopBackState = loop;

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    ATNState right = newState(pred);


    AbstractPredicateTransition p;
    if (pred.getOptionString(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME) != null) {
      int precedence = Integer.parseInt(pred.getOptionString(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME));
      p = new PrecedencePredicateTransition(right, precedence);
    }
    else {
      boolean isCtxDependent = UseDefAnalyzer.actionIsContextDependent(pred);
      p = new PredicateTransition(right, currentRule.index, g.sempreds.get(pred), isCtxDependent);
    }

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      int precedence = Integer.parseInt(pred.getOptionString(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME));
      p = new PrecedencePredicateTransition(right, precedence);
    }
    else {
      boolean isCtxDependent = UseDefAnalyzer.actionIsContextDependent(pred);
      p = new PredicateTransition(right, currentRule.index, g.sempreds.get(pred), isCtxDependent);
    }


    left.addTransition(p);
    pred.atnState = left;
    return new Handle(left, right);

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  /* start->ruleblock->end */
  @NotNull
  @Override
  public Handle rule(@NotNull GrammarAST ruleAST, @NotNull String name, @NotNull Handle blk) {
    Rule r = g.getRule(name);
    RuleStartState start = atn.ruleToStartState[r.index];
    epsilon(start, blk.left);
    RuleStopState stop = atn.ruleToStopState[r.index];
    epsilon(blk.right, stop);
    Handle h = new Handle(start, stop);
//    ATNPrinter ser = new ATNPrinter(g, h.left);

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