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A metacompilation framework for Java using attribute grammars.
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# Copyright (c) 2013-2016, The JastAdd Team
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the Lund University nor the names of its
#       contributors may be used to endorse or promote products derived from
#       this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# POSSIBILITY OF SUCH DAMAGE.

Opt.isEmpty [[$Opt.EMPTY == node || node instanceof $Opt && (($Opt) node).numChildren() <= 0]]

Opt.additionalDeclarations [[
$if(EmptyContainerSingletons)
  protected static final $Opt $Opt.EMPTY = new $Opt() {
    @Override
    public void insertChild($ASTNode node, int i) {
      throw new Error("attempting to insertChild() on empty $(Opt) singleton!");
    }
    @Override
    public void addChild($ASTNode node) {
      throw new Error("attempting to addChild() on empty $(Opt) singleton!");
    }
    @Override
    public void removeChild(int i) {
      throw new Error("attempting to removeChild() on empty $(Opt) singleton!");
    }
    @Override
    public void setChild($ASTNode child, int pos) {
      throw new Error("attempting to setChild() in empty $Opt singleton!");
    }
  };
$endif
]]

OptionalComponent [[

$if(!#isNTA)
  /**
   * Replaces the optional node for the $Name child. This is the $Opt
   * node containing the child $Name, not the actual child!
   * @param opt The new node to be used as the optional node for the $Name child.
   * @apilevel low-level
   */
  $Modifier void $Host.set$(Name)Opt($OptType opt) {
    $include(State.incHookConstructionStart)
    setChild(opt, $Index);
    $include(State.incHookConstructionEnd)
  }

$endif
$if(#ntaShadowingNonNTA)
  /**
   * This method should not be called. This method throws an exception due to
   * the corresponding child being an NTA shadowing a non-NTA child.
   * @param node
   * @apilevel internal
   */
  public void $Host.set$(Name)Opt($OptType node) {
    throw new Error("Can not replace NTA child $(Name)Opt in $Host!");
  }

$endif
  /**
   * Replaces the (optional) $Name child.
   * @param node The new node to be used as the $Name child.
   * @apilevel high-level
   */
  $Modifier void $Host.set$Name($Type node) {
    $include(State.incHookConstructionStart)
$if(EmptyContainerSingletons)
  $if(#isNTA)
    // TODO: should also check if getOpt() is the empty singleton, since we check the _value on return.
    get$(Name)Opt().setChild(node, 0);
  $else
    if (node != null) {
      setChild(new $Opt(node), $Index);
    } else {
      setChild($Opt.EMPTY, $Index);
    }
  $endif
$else
    get$(Name)Opt().setChild(node, 0);
$endif
    $include(State.incHookConstructionEnd)
  }

  /**
   * Check whether the optional $Name child exists.
   * @return {@code true} if the optional $Name child exists, {@code false} if it does not.
   * @apilevel high-level
   */
  $Modifier boolean $Host.has$Name() {
    return get$(Name)Opt().getNumChild() != 0;
  }

  /**
   * Retrieves the (optional) $Name child.
   * @return The $Name child, if it exists. Returns {@code null} otherwise.
   * @apilevel low-level
   */
  #annotations
  $Modifier $Type $Host.get$Name() {
    return ($Type) get$(Name)Opt().getChild(0);
  }

$if(#isNTA)
  /**
   * Retrieves the optional node for child $Name. This is the $Opt node containing the child $Name, not the actual child!
   * This method does not invoke AST transformations.
   * @return The optional node for child $Name.
   * @apilevel low-level
   */
  #annotations
  $Modifier $OptType $Host.get$(Name)OptNoTransform() {
    return ($OptType) getChildNoTransform($Index);
  }

  /**
   * Retrieves the child position of the optional child $Name.
   * @return The the child position of the optional child $Name.
   * @apilevel low-level
   */
  protected int $Host.get$(Name)OptChildPosition() {
    return $Index;
  }
$else

  /**
   * Retrieves the optional node for the $Name child. This is the $Opt node containing the child $Name, not the actual child!
   * @return The optional node for child the $Name child.
   * @apilevel low-level
   */
  #annotations
  $include(OptionalComponent.generatedAnnotations)
  $Modifier $OptType $Host.get$(Name)Opt() {
    return ($OptType) getChild($Index);
  }

  /**
   * Retrieves the optional node for child $Name. This is the $Opt node containing the child $Name, not the actual child!
   * This method does not invoke AST transformations.
   * @return The optional node for child $Name.
   * @apilevel low-level
   */
  #annotations
  $Modifier $OptType $Host.get$(Name)OptNoTransform() {
    return ($OptType) getChildNoTransform($Index);
  }
$endif
]]