plugins/devkit/src/actions/ShuffleNamesAction.java

/*
 * Copyright 2000-2012 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.idea.devkit.actions;

import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.actionSystem.LangDataKeys;
import com.intellij.openapi.actionSystem.PlatformDataKeys;
import com.intellij.openapi.application.AccessToken;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.command.CommandProcessorEx;
import com.intellij.openapi.command.UndoConfirmationPolicy;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiRecursiveElementWalkingVisitor;
import com.intellij.psi.impl.source.tree.LeafPsiElement;
import gnu.trove.THashMap;

import java.util.*;

/**
 * @author gregsh
 */
public class ShuffleNamesAction extends AnAction {
  @Override
  public void update(AnActionEvent e) {
    Editor editor = CommonDataKeys.EDITOR.getData(e.getDataContext());
    PsiFile file = CommonDataKeys.PSI_FILE.getData(e.getDataContext());
    e.getPresentation().setEnabled(editor != null && file != null);
  }

  @Override
  public void actionPerformed(AnActionEvent e) {
    final Editor editor = CommonDataKeys.EDITOR.getData(e.getDataContext());
    PsiFile file = CommonDataKeys.PSI_FILE.getData(e.getDataContext());
    if (editor == null || file == null) return;
    final Project project = file.getProject();
    CommandProcessorEx commandProcessor = (CommandProcessorEx)CommandProcessorEx.getInstance();
    Object commandToken = commandProcessor.startCommand(project, e.getPresentation().getText(), e.getPresentation().getText(), UndoConfirmationPolicy.DEFAULT);
    AccessToken token = ApplicationManager.getApplication().acquireWriteActionLock(getClass());
    try {
      shuffleIds(file, editor);
    }
    finally {
      token.finish();
      commandProcessor.finishCommand(project, commandToken, null);
    }
  }

  private static boolean shuffleIds(PsiFile file, Editor editor) {
    final Map<String, String> map = new THashMap<String, String>();
    final StringBuilder sb = new StringBuilder();
    final StringBuilder quote = new StringBuilder();
    final ArrayList<String> split = new ArrayList<String>(100);
    file.acceptChildren(new PsiRecursiveElementWalkingVisitor() {
      @Override
      public void visitElement(PsiElement element) {
        if (element instanceof LeafPsiElement) {
          String type = ((LeafPsiElement)element).getElementType().toString();
          String text = element.getText();
          if (text.isEmpty()) return;

          for (int i=0, len=text.length(); i<len/2; i++) {
            char c = text.charAt(i);
            if (c == text.charAt(len-i-1) && !Character.isLetter(c)) {
              quote.append(c);
            }
            else break;
          }

          boolean isQuoted = quote.length() > 0;
          boolean isNumber = false;
          if (isQuoted || type.equals("ID") || type.contains("IDENT") && !"ts".equals(text) ||
              (isNumber = text.matches("[0-9]+"))) {
            String replacement = map.get(text);
            if (replacement == null) {
              split.addAll(Arrays.asList((isQuoted? text.substring(quote.length(), text.length()-quote.length()).replace("''", "") : text).split("")));
              if (!isNumber) {
                for (ListIterator<String> it = split.listIterator(); it.hasNext(); ) {
                  String s = it.next();
                  if (s.isEmpty()) {
                    it.remove();
                    continue;
                  }
                  int c = s.charAt(0);
                  int cap = c & 32;
                  c &= ~cap;
                  c = (char) ((c >= 'A') && (c <= 'Z') ? ((c - 'A' + 7) % 26 + 'A') : c) | cap;
                  it.set(String.valueOf((char)c));
                }
              }
              Collections.shuffle(split);
              if (isNumber && "0".equals(split.get(0))) {
                split.set(0, "1");
              }
              replacement = StringUtil.join(split, "");
              if (isQuoted) {
                replacement = quote + replacement + quote.reverse();
              }
              map.put(text, replacement);
            }
            text = replacement;
          }
          sb.append(text);
          quote.setLength(0);
          split.clear();
        }
        super.visitElement(element);
      }
    });
    editor.getDocument().setText(sb.toString());
    return true;
  }
}