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

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 = "A";
    assertEquals(expecting, found);
  }


  @Test public void testSingleLevelTree() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B C D)");
    String found = t.toStringTree();
    String expecting = "(A B C D)";
    assertEquals(expecting, found);
  }

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    String expecting = "(A B C D)";
    assertEquals(expecting, found);
  }


  @Test public void testListTree() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(nil A B C)");
    String found = t.toStringTree();
    String expecting = "A B C";
    assertEquals(expecting, found);
  }

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    String expecting = "A B C";
    assertEquals(expecting, found);
  }


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

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    CommonTree t = (CommonTree)wiz.create("A B C");
    assertTrue(t==null);
  }


  @Test public void testDoubleLevelTree() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A (B C) (B D) E)");
    String found = t.toStringTree();
    String expecting = "(A (B C) (B D) E)";
    assertEquals(expecting, found);
  }

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    String expecting = "(A (B C) (B D) E)";
    assertEquals(expecting, found);
  }


  @Test public void testSingleNodeIndex() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("ID");
    Map m = wiz.index(t);
    String found = m.toString();
    String expecting = "{10=[ID]}";
    assertEquals(expecting, found);
  }

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    String expecting = "{10=[ID]}";
    assertEquals(expecting, found);
  }


  @Test public void testNoRepeatsIndex() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B C D)");
    Map m = wiz.index(t);
    String found = sortMapToString(m);
        String expecting = "{5=[A], 6=[B], 7=[C], 8=[D]}";
    assertEquals(expecting, found);
  }

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        String expecting = "{5=[A], 6=[B], 7=[C], 8=[D]}";
    assertEquals(expecting, found);
  }


  @Test public void testRepeatsIndex() throws Exception {
    TreeWizard wiz = new TreeWizard(adaptor, tokens);
    CommonTree t = (CommonTree)wiz.create("(A B (A C B) B D D)");
    Map m = wiz.index(t);
    String found =  sortMapToString(m);
        String expecting = "{5=[A, A], 6=[B, B, B], 7=[C], 8=[D, D]}";
    assertEquals(expecting, found);
  }

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        String expecting = "{5=[A, A], 6=[B, B, B], 7=[C], 8=[D, D]}";
    assertEquals(expecting, found);
  }


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

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


  @Test public void testNoRepeatsVisit2() 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("C"),
             new TreeWizard.Visitor() {
              public void visit(Object t) {
                elements.add(t);
              }
             });

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


  @Test public void testRepeatsVisit() 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.Visitor() {
              public void visit(Object t) {
                elements.add(t);
              }
             });

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