Review

19

/home/eko/MUBench/MUBench/checkouts/closure/319/original-src/com/google/javascript/jscomp/DefinitionsRemover.java

performRemove()

class DefinitionsRemover.Definition {
    /**
     * Subclasses should override to remove the definition from the AST.
     */
    protected abstract void performRemove();
}

class DefinitionsRemover.UnknownDefinition {
    @Override
    public void performRemove() {
      throw new IllegalArgumentException("Can't remove an UnknownDefinition");
    }
}

class DefinitionsRemover.ExternalNameOnlyDefinition {
    @Override
    public void performRemove() {
      throw new IllegalArgumentException(
          "Can't remove external name-only definition");
    }
}

class DefinitionsRemover.FunctionArgumentDefinition {
    @Override
    public void performRemove() {
      throw new IllegalArgumentException(
          "Can't remove a FunctionArgumentDefinition");
    }
}

class DefinitionsRemover.NamedFunctionDefinition {
    @Override
    public void performRemove() {
      function.detachFromParent();
    }
}

class DefinitionsRemover.FunctionExpressionDefinition {
    @Override
    public void performRemove() {
      // replace internal name with ""
      function.replaceChild(function.getFirstChild(),
                            Node.newString(Token.NAME, ""));
    }
}

class DefinitionsRemover.AssignmentDefinition {
    @Override
    public void performRemove() {
      // A simple assignment. foo = bar() -> bar();
      Node parent = assignment.getParent();
      Node last = assignment.getLastChild();
      assignment.removeChild(last);
      parent.replaceChild(assignment, last);
    }
}

class DefinitionsRemover.ObjectLiteralPropertyDefinition {
    @Override
    public void performRemove() {
      literal.removeChild(name);
    }
}

class DefinitionsRemover.VarDefinition {
    @Override
    public void performRemove() {
      Node var = name.getParent();
      Preconditions.checkState(var.getFirstChild() == var.getLastChild(),
          "AST should be normalized first");
      Node parent = var.getParent();
      Node rValue = name.removeFirstChild();
      Preconditions.checkState(parent.getType() != Token.FOR);
      parent.replaceChild(var, NodeUtil.newExpr(rValue));
    }
}