Examples of org.antlr.runtime.tree.CommonTreeNodeStream.pop()

Class org.antlr.runtime.tree.CommonTreeNodeStream

Examples of org.antlr.runtime.tree.CommonTreeNodeStream.pop()

org.antlr.runtime.tree.CommonTreeNodeStream.pop()
Seek back to previous index saved during last push() call. Return top of stack (return index).

    stream.consume(); // consume DN
    assertEquals(103, ((Tree)stream.LT(1)).getType());
    stream.consume(); // consume 103
    assertEquals(Token.UP, ((Tree)stream.LT(1)).getType());
    // RETURN
    stream.pop();
    assertEquals(107, ((Tree)stream.LT(1)).getType());
  }


  public void testNestedPushPop() throws Exception {
    // ^(101 ^(102 103) ^(104 105) ^(106 107) 108 109)

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    stream.consume(); // consume DN
    assertEquals(105, ((Tree)stream.LT(1)).getType());
    stream.consume(); // consume 103
    assertEquals(Token.UP, ((Tree)stream.LT(1)).getType());
    // RETURN (to UP node in 102 subtree)
    stream.pop();


    assertEquals(Token.UP, ((Tree)stream.LT(1)).getType());
    // RETURN (to empty stack)
    stream.pop();
    assertEquals(107, ((Tree)stream.LT(1)).getType());

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    // RETURN (to UP node in 102 subtree)
    stream.pop();


    assertEquals(Token.UP, ((Tree)stream.LT(1)).getType());
    // RETURN (to empty stack)
    stream.pop();
    assertEquals(107, ((Tree)stream.LT(1)).getType());
  }


  public void testPushPopFromEOF() throws Exception {
    // ^(101 ^(102 103) ^(104 105) ^(106 107) 108 109)

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    stream.consume(); // consume DN
    assertEquals(103, ((Tree)stream.LT(1)).getType());
    stream.consume(); // consume 103
    assertEquals(Token.UP, ((Tree)stream.LT(1)).getType());
    // RETURN (to empty stack)
    stream.pop();
    assertEquals(Token.EOF, ((Tree)stream.LT(1)).getType());


    // CALL 104
    stream.push(indexOf104);
    assertEquals(104, ((Tree)stream.LT(1)).getType());

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    stream.consume(); // consume DN
    assertEquals(105, ((Tree)stream.LT(1)).getType());
    stream.consume(); // consume 103
    assertEquals(Token.UP, ((Tree)stream.LT(1)).getType());
    // RETURN (to empty stack)
    stream.pop();
    assertEquals(Token.EOF, ((Tree)stream.LT(1)).getType());
  }


  public void testStackStretch() throws Exception {
    // make more than INITIAL_CALL_STACK_SIZE pushes

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    CommonTreeNodeStream stream = new CommonTreeNodeStream(r0);
    // go 1 over initial size
    for (int i=1; i<=CommonTreeNodeStream.INITIAL_CALL_STACK_SIZE+1; i++) {
      stream.push(i);
    }
    assertEquals(10, stream.pop());
    assertEquals(9, stream.pop());
  }


}

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    // go 1 over initial size
    for (int i=1; i<=CommonTreeNodeStream.INITIAL_CALL_STACK_SIZE+1; i++) {
      stream.push(i);
    }
    assertEquals(10, stream.pop());
    assertEquals(9, stream.pop());
  }


}

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