SpliceAction.java

/*
 * Copyright 2009 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jetbrains.plugins.clojure.actions.editor;

import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.plugins.clojure.psi.ClojurePsiElement;
import org.jetbrains.plugins.clojure.psi.api.ClBraced;

/**
 * An action to splice s-expressions imnto their parents.
 *
 * @author <a href="mailto:ianp@ianp.org">Ian Phillips</a>
 */
public class SpliceAction extends ClojureEditorAction {

  public SpliceAction() {
    super(new SpliceActionHandler());
  }

  private static class SpliceActionHandler extends AbstractSexpActionHandler {
    protected SpliceActionHandler() {
      super(false);
    }
    @Override
    protected void executeWriteAction(ClBraced sexp, Editor editor, Project project, DataContext dataContext) {
      PsiElement parent = sexp.getParent();
      if (parent == null) { return; }
      PsiElement[] children = sexp.getChildren();

      // if the s-exp is not the first in it's parent, e.g. (a (b c)) -> (a b c)
      PsiElement previous = PsiTreeUtil.getPrevSiblingOfType(sexp, ClojurePsiElement.class);
      if (previous != null) {
        for (PsiElement child : children) {
          previous = parent.addAfter(child, previous);
        }
        sexp.delete();
        return;
      }

      // if the s-exp is not the last in it's parent, e.g. ((a b) c) -> (a b c)
      PsiElement next = PsiTreeUtil.getNextSiblingOfType(sexp, ClojurePsiElement.class);
      if (next != null) {
        for (int i = children.length; i != 0;) {
          next = parent.addBefore(children[--i], next);
        }
        sexp.delete();
        return;
      }

      // the corner case of nested s-exps, e.g. ((a b c)) -> (a b c)
      for (PsiElement child : children) {
        parent.addBefore(child, parent.getLastChild());
      }
      sexp.delete();
    }
  }

}