platform/lang-impl/src/com/intellij/psi/filters/getters/AllWordsGetter.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.intellij.psi.filters.getters;
  18
  19 import com.intellij.codeInsight.completion.CompletionContext;
  20 import com.intellij.codeInsight.completion.CompletionUtil;
  21 import com.intellij.openapi.util.text.StringUtil;
  22 import com.intellij.psi.PsiElement;
  23 import com.intellij.psi.filters.ContextGetter;
  24 import com.intellij.psi.impl.cache.impl.id.IdTableBuilding;
  25 import com.intellij.util.ArrayUtil;
  26
  27 import java.util.ArrayList;
  28 import java.util.List;
  29
  30 public class AllWordsGetter implements ContextGetter {
  31   public Object[] get(final PsiElement context, final CompletionContext completionContext) {
  32     final int offset = completionContext.getStartOffset();
  33     return getAllWords(context, offset);
  34   }
  35
  36   public static String[] getAllWords(final PsiElement context, final int offset) {
  37     if (StringUtil.isEmpty(CompletionUtil.findJavaIdentifierPrefix(context, offset))) {
  38       return ArrayUtil.EMPTY_STRING_ARRAY;
  39     }
  40
  41     final CharSequence chars = context.getContainingFile().getViewProvider().getContents(); // ??
  42     final List<String> objs = new ArrayList<String>();
  43     IdTableBuilding.scanWords(new IdTableBuilding.ScanWordProcessor() {
  44       public void run(final CharSequence chars, final int start, final int end) {
  45         if (start > offset || offset > end) {
  46           objs.add(chars.subSequence(start, end).toString());
  47         }
  48       }
  49     }, chars, 0, chars.length());
  50     return ArrayUtil.toStringArray(objs);
  51   }
  52 }