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/**
 * Copyright (c) 2012 itemis AG (http://www.itemis.eu) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.eclipse.xtext.xbase.compiler;

import org.eclipse.xtext.xbase.compiler.LoopParams;
import org.eclipse.xtext.xbase.compiler.output.ITreeAppendable;
import org.eclipse.xtext.xbase.lib.IterableExtensions;
import org.eclipse.xtext.xbase.lib.ObjectExtensions;
import org.eclipse.xtext.xbase.lib.Procedures.Procedure1;

/**
 * @author Jan Koehnlein
 */
@SuppressWarnings("all")
public class LoopExtensions {
  /**
   * Iterates elements and execute the procedure.
   * A prefix, a separator and a suffix can be initialized with the loopInitializer lambda.
   */
  public  void forEach(final ITreeAppendable appendable, final Iterable elements, final Procedure1 loopInitializer, final Procedure1 procedure) {
    boolean _isEmpty = IterableExtensions.isEmpty(elements);
    if (_isEmpty) {
      return;
    }
    LoopParams _loopParams = new LoopParams();
    final LoopParams params = ObjectExtensions.operator_doubleArrow(_loopParams, loopInitializer);
    params.appendPrefix(appendable);
    T _head = IterableExtensions.head(elements);
    ObjectExtensions.operator_doubleArrow(_head, procedure);
    Iterable _tail = IterableExtensions.tail(elements);
    final Procedure1 _function = new Procedure1() {
        public void apply(final T it) {
          params.appendSeparator(appendable);
          ObjectExtensions.operator_doubleArrow(it, procedure);
        }
      };
    IterableExtensions.forEach(_tail, _function);
    params.appendSuffix(appendable);
  }
  
  /**
   * Uses curly braces and comma as delimiters. Doesn't use them for single valued iterables.
   */
  public  void forEachWithShortcut(final ITreeAppendable appendable, final Iterable elements, final Procedure1 procedure) {
    int _size = IterableExtensions.size(elements);
    boolean _equals = (_size == 1);
    if (_equals) {
      T _head = IterableExtensions.head(elements);
      ObjectExtensions.operator_doubleArrow(_head, procedure);
    } else {
      final Procedure1 _function = new Procedure1() {
          public void apply(final LoopParams it) {
            it.setPrefix("{ ");
            it.setSeparator(", ");
            it.setSuffix(" }");
          }
        };
      this.forEach(appendable, elements, _function, procedure);
    }
  }
}