Examples of org.antlr.runtime.tree.TreeWizard$Visitor

org.antlr.runtime.tree.TreeWizard
Build and navigate trees with this object. Must know about the names of tokens so you have to pass in a map or array of token names (from which this class can build the map). I.e., Token DECL means nothing unless the class can translate it to a token type. In order to create nodes and navigate, this class needs a TreeAdaptor. This class can build a token type -> node index for repeated use or for iterating over the various nodes with a particular type. This class works in conjunction with the TreeAdaptor rather than moving all this functionality into the adaptor. An adaptor helps build and navigate trees using methods. This class helps you do it with string patterns like "(A B C)". You can create a tree from that pattern or match subtrees against it.

    String expecting = "[B, B, B]";
    assertEquals(expecting, found);
  }


  @Test public void testRepeatsVisit2() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B (A C B) B D D)");
    final List elements = new ArrayList();
    wiz.visit(t, wiz.getTokenType("A"),
             new TreeWizard.Visitor() {
              public void visit(Object t) {
                elements.add(t);
              }
             });

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    String expecting = "[A, A]";
    assertEquals(expecting, found);
  }


  @Test public void testRepeatsVisitWithContext() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B (A C B) B D D)");
    final List elements = new ArrayList();
    wiz.visit(t, wiz.getTokenType("B"),
       new TreeWizard.ContextVisitor() {
         public void visit(Object t, Object parent, int childIndex, Map labels) {
           elements.add(adaptor.getText(t)+"@"+
                (parent!=null?adaptor.getText(parent):"nil")+
                "["+childIndex+"]");

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    String expecting = "[B@A[0], B@A[1], B@A[2]]";
    assertEquals(expecting, found);
  }


  @Test public void testRepeatsVisitWithNullParentAndContext() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B (A C B) B D D)");
    final List elements = new ArrayList();
    wiz.visit(t, wiz.getTokenType("A"),
       new TreeWizard.ContextVisitor() {
         public void visit(Object t, Object parent, int childIndex, Map labels) {
           elements.add(adaptor.getText(t)+"@"+
                (parent!=null?adaptor.getText(parent):"nil")+
                "["+childIndex+"]");

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    String expecting = "[A@nil[0], A@A[1]]";
    assertEquals(expecting, found);
  }


  @Test public void testVisitPattern() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B C (A B) D)");
    final List elements = new ArrayList();
    wiz.visit(t, "(A B)",
             new TreeWizard.Visitor() {
              public void visit(Object t) {
                elements.add(t);
              }
             });

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    String expecting = "[A]"; // shouldn't match overall root, just (A B)
    assertEquals(expecting, found);
  }


  @Test public void testVisitPatternMultiple() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B C (A B) (D (A B)))");
    final List elements = new ArrayList();
    wiz.visit(t, "(A B)",
             new TreeWizard.ContextVisitor() {
               public void visit(Object t, Object parent, int childIndex, Map labels) {
                 elements.add(adaptor.getText(t)+"@"+
                      (parent!=null?adaptor.getText(parent):"nil")+
                      "["+childIndex+"]");

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    String expecting = "[A@A[2], A@D[0]]"; // shouldn't match overall root, just (A B)
    assertEquals(expecting, found);
  }


  @Test public void testVisitPatternMultipleWithLabels() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B C (A[foo] B[bar]) (D (A[big] B[dog])))");
    final List elements = new ArrayList();
    wiz.visit(t, "(%a:A %b:B)",
             new TreeWizard.ContextVisitor() {
               public void visit(Object t, Object parent, int childIndex, Map labels) {
                 elements.add(adaptor.getText(t)+"@"+
                      (parent!=null?adaptor.getText(parent):"nil")+
                      "["+childIndex+"]"+labels.get("a")+"&"+labels.get("b"));

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    String expecting = "[foo@A[2]foo&bar, big@D[0]big&dog]";
    assertEquals(expecting, found);
  }


  @Test public void testParse() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B C)");
    boolean valid = wiz.parse(t, "(A B C)");
    assertTrue(valid);
  }

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    boolean valid = wiz.parse(t, "(A B C)");
    assertTrue(valid);
  }


  @Test public void testParseSingleNode() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("A");
    boolean valid = wiz.parse(t, "A");
    assertTrue(valid);
  }

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    boolean valid = wiz.parse(t, "A");
    assertTrue(valid);
  }


  @Test public void testParseFlatTree() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(nil A B C)");
    boolean valid = wiz.parse(t, "(nil A B C)");
    assertTrue(valid);
  }

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    boolean valid = wiz.parse(t, "(nil A B C)");
    assertTrue(valid);
  }


  @Test public void testWildcard() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B C)");
    boolean valid = wiz.parse(t, "(A . .)");
    assertTrue(valid);
  }

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