Examples of org.antlr.v4.runtime.tree.xpath.XPath

org.antlr.v4.codegen.model.Choice
ANTLRitself then walk path elements from left to right. At each separator-word pair, find set of nodes. Next stage uses those as work list.

The basic interface is {@link XPath#findAll ParseTree.findAll}{@code (tree, pathString, parser)}. But that is just shorthand for:
```
 {@link XPath} p = new {@link XPath#XPath XPath}(parser, pathString); return p. {@link #evaluate evaluate}(tree); 
```
See {@code org.antlr.v4.test.TestXPath} for descriptions. In short, thisallows operators:

/

root

//

anywhere

!

invert; this must appear directly after root or anywhere operator

and path elements:

ID

token name

'string'

any string literal token from the grammar

expr

rule name

*

wildcard matching any node

Whitespace is not allowed.

    if ( !recRuleTemplates.isDefined("recRule") ) {
      tool.errMgr.toolError(ErrorType.MISSING_CODE_GEN_TEMPLATES, "LeftRecursiveRules");
    }


    // use codegen to get correct language templates; that's it though
    CodeGenerator gen = new CodeGenerator(tool, null, language);
    codegenTemplates = gen.getTemplates();
  }

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    blk.ops = ops;
    return blk;
  }


  @Override
  public List<SrcOp> action(ActionAST ast) { return list(new Action(this, ast)); }

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  @Override
  public List<SrcOp> ruleRef(GrammarAST ID, GrammarAST label, GrammarAST args) {
    InvokeRule invokeOp = new InvokeRule(this, ID, label);
    // If no manual label and action refs as token/rule not label, we need to define implicit label
    if ( controller.needsImplicitLabel(ID, invokeOp) ) defineImplicitLabel(ID, invokeOp);
    AddToLabelList listLabelOp = getAddToListOpIfListLabelPresent(invokeOp, label);
    return list(invokeOp, listLabelOp);
  }

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//        TokenListDecl l = getTokenListLabelDecl(label);
//        getCurrentRuleFunction().addContextDecl(ID.getAltLabel(), l);
//      }
    }
    if ( controller.needsImplicitLabel(ID, matchOp) ) defineImplicitLabel(ID, matchOp);
    AddToLabelList listLabelOp = getAddToListOpIfListLabelPresent(matchOp, labelAST);
    return list(matchOp, listLabelOp);
  }

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        matchOp.labels.add(d);
        rf.addContextDecl(setAST.getAltLabel(), d);
      }
    }
    if ( controller.needsImplicitLabel(setAST, matchOp) ) defineImplicitLabel(setAST, matchOp);
    AddToLabelList listLabelOp = getAddToListOpIfListLabelPresent(matchOp, labelAST);
    return list(matchOp, listLabelOp);
  }

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        TokenListDecl l = getTokenListLabelDecl(label);
        getCurrentRuleFunction().addContextDecl(ast.getAltLabel(), l);
      }
    }
    if ( controller.needsImplicitLabel(ast, wild) ) defineImplicitLabel(ast, wild);
    AddToLabelList listLabelOp = getAddToListOpIfListLabelPresent(wild, labelAST);
    return list(wild, listLabelOp);
  }

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    // all labels must be in scope struct in case we exec action out of context
    getCurrentRuleFunction().addContextDecl(ast.getAltLabel(), d);
  }


  public AddToLabelList getAddToListOpIfListLabelPresent(LabeledOp op, GrammarAST label) {
    AddToLabelList labelOp = null;
    if ( label!=null && label.parent.getType()==ANTLRParser.PLUS_ASSIGN ) {
      String listLabel = gen.getTarget().getListLabel(label.getText());
      labelOp = new AddToLabelList(this, listLabel, op.getLabels().get(0));
    }
    return labelOp;
  }

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    return new LL1AltBlock(this, blkAST, alts);
  }


  @Override
  public Choice getComplexChoiceBlock(BlockAST blkAST, List<CodeBlockForAlt> alts) {
    return new AltBlock(this, blkAST, alts);
  }

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  }


  @Override
  public Choice getChoiceBlock(BlockAST blkAST, List<CodeBlockForAlt> alts, GrammarAST labelAST) {
    int decision = ((DecisionState)blkAST.atnState).decision;
    Choice c;
    if ( !g.tool.force_atn && AnalysisPipeline.disjoint(g.decisionLOOK.get(decision)) ) {
      c = getLL1ChoiceBlock(blkAST, alts);
    }
    else {
      c = getComplexChoiceBlock(blkAST, alts);

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  @Override
  public Choice getLL1EBNFBlock(GrammarAST ebnfRoot, List<CodeBlockForAlt> alts) {
    int ebnf = 0;
    if ( ebnfRoot!=null ) ebnf = ebnfRoot.getType();
    Choice c = null;
    switch ( ebnf ) {
      case ANTLRParser.OPTIONAL :
        if ( alts.size()==1 ) c = new LL1OptionalBlockSingleAlt(this, ebnfRoot, alts);
        else c = new LL1OptionalBlock(this, ebnfRoot, alts);
        break;

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Related Classes of org.antlr.v4.runtime.tree.xpath.XPath

org.antlr.runtime.ANTLRFileStream

org.antlr.runtime.ANTLRStringStream

org.antlr.runtime.CharStream

org.antlr.runtime.CommonToken

org.antlr.runtime.Token

org.antlr.runtime.tree.CommonTree

org.antlr.runtime.tree.CommonTreeNodeStream

org.antlr.runtime.tree.Tree

org.antlr.runtime.tree.TreeVisitor

org.antlr.v4.analysis.LeftRecursionDetector

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