plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/code/MavenTypedHandlerDelegate.java

/*
 * Copyright 2000-2009 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.idea.maven.dom.code;

import com.intellij.codeInsight.CodeInsightSettings;
import com.intellij.codeInsight.editorActions.TypedHandlerDelegate;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiFile;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.idea.maven.dom.MavenDomUtil;

public class MavenTypedHandlerDelegate extends TypedHandlerDelegate {
  @Override
  public Result charTyped(char c, Project project, @NotNull Editor editor, @NotNull PsiFile file) {
    if (!CodeInsightSettings.getInstance().AUTOINSERT_PAIR_BRACKET) return Result.CONTINUE;

    if (c != '{') return Result.CONTINUE;
    if (!shouldProcess(file)) return Result.CONTINUE;

    int offset = editor.getCaretModel().getOffset();
    if (shouldCloseBrace(editor, offset, c)) {
      editor.getDocument().insertString(offset, "}");
      return Result.STOP;
    }
    return Result.CONTINUE;
  }

  private static boolean shouldCloseBrace(Editor editor, int offset, char c) {
    CharSequence text = editor.getDocument().getCharsSequence();

    if (offset < 2) return false;
    if (c != '{' || text.charAt(offset - 2) != '$') return false;

    if (offset < text.length()) {
      char next = text.charAt(offset);
      if (next == '}') return false;
      if (Character.isLetterOrDigit(next)) return false;
    }

    return true;
  }

  public static boolean shouldProcess(PsiFile file) {
    return MavenDomUtil.isMavenFile(file) || MavenDomUtil.isFilteredResourceFile(file);
  }
}