private static void addCompletionVariant(
     ErrorState state,
     CompletionState completionState,
     PsiBuilder builder_,
     Object o,
     int offset) {
   boolean add = false;
   int diff = completionState.offset - offset;
   String text = completionState.convertItem(o);
   int length = text == null ? 0 : text.length();
   if (length == 0) return;
   if (diff == 0) {
     add = true;
   } else if (diff > 0 && diff <= length) {
     CharSequence fragment =
         builder_.getOriginalText().subSequence(offset, completionState.offset);
     add = StringUtil.startsWithIgnoreCase(text, fragment.toString());
   } else if (diff < 0) {
     for (int i = -1; ; i--) {
       IElementType type = builder_.rawLookup(i);
       int tokenStart = builder_.rawTokenTypeStart(i);
       if (state.whitespaceTokens.contains(type) || state.commentTokens.contains(type)) {
         diff = completionState.offset - tokenStart;
       } else if (type != null && tokenStart < completionState.offset) {
         CharSequence fragment =
             builder_.getOriginalText().subSequence(tokenStart, completionState.offset);
         if (StringUtil.startsWithIgnoreCase(text, fragment.toString())) {
           diff = completionState.offset - tokenStart;
         }
         break;
       } else break;
     }
     add = diff >= 0 && diff < length;
   }
   add =
       add
           && length > 1
           && !(text.charAt(0) == '<' && text.charAt(length - 1) == '>')
           && !(text.charAt(0) == '\'' && text.charAt(length - 1) == '\'' && length < 5);
   if (add) {
     completionState.items.add(text);
   }
 }
  private static void addCompletionVariant(
      @NotNull PsiBuilder builder, @NotNull CompletionState completionState, Object o) {
    int offset = builder.getCurrentOffset();
    if (!builder.eof() && offset == builder.rawTokenTypeStart(1))
      return; // suppress for zero-length tokens

    boolean add = false;
    int diff = completionState.offset - offset;
    String text = completionState.convertItem(o);
    int length = text == null ? 0 : text.length();
    if (length == 0) return;
    if (diff == 0) {
      add = true;
    } else if (diff > 0 && diff <= length) {
      CharSequence fragment = builder.getOriginalText().subSequence(offset, completionState.offset);
      add = completionState.prefixMatches(fragment.toString(), text);
    } else if (diff < 0) {
      for (int i = -1; ; i--) {
        IElementType type = builder.rawLookup(i);
        int tokenStart = builder.rawTokenTypeStart(i);
        if (isWhitespaceOrComment(builder, type)) {
          diff = completionState.offset - tokenStart;
        } else if (type != null && tokenStart < completionState.offset) {
          CharSequence fragment =
              builder.getOriginalText().subSequence(tokenStart, completionState.offset);
          if (completionState.prefixMatches(fragment.toString(), text)) {
            diff = completionState.offset - tokenStart;
          }
          break;
        } else break;
      }
      add = diff >= 0 && diff < length;
    }
    add =
        add
            && length > 1
            && !(text.charAt(0) == '<' && text.charAt(length - 1) == '>')
            && !(text.charAt(0) == '\'' && text.charAt(length - 1) == '\'' && length < 5);
    if (add) {
      completionState.addItem(builder, text);
    }
  }
  public void advance() {
    final String tokenText = myBuilder.getTokenText();
    final int tokenLength = tokenText == null ? 0 : tokenText.length();

    final int whiteSpaceStart = getCurrentOffset() + tokenLength;
    myBuilder.advanceLexer();
    final int whiteSpaceEnd = getCurrentOffset();
    final String whiteSpaceText =
        myBuilder.getOriginalText().subSequence(whiteSpaceStart, whiteSpaceEnd).toString();

    int i = whiteSpaceText.lastIndexOf('\n');
    if (i >= 0) {
      myCurrentIndent = whiteSpaceText.length() - i - 1;
      myNewLine = true;
    } else {
      myNewLine = false;
    }
  }
  public static int nextTokenIsFast(PsiBuilder builder, String tokenText, boolean caseSensitive) {
    CharSequence sequence = builder.getOriginalText();
    int offset = builder.getCurrentOffset();
    int endOffset = offset + tokenText.length();
    CharSequence subSequence = sequence.subSequence(offset, Math.min(endOffset, sequence.length()));

    if (!Comparing.equal(subSequence, tokenText, caseSensitive)) return 0;

    int count = 0;
    while (true) {
      int nextOffset = builder.rawTokenTypeStart(++count);
      if (nextOffset > endOffset) {
        return -count;
      } else if (nextOffset == endOffset) {
        break;
      }
    }
    return count;
  }
  public static boolean consumeTokenInner(PsiBuilder builder_, String text, boolean caseSensitive) {
    final CharSequence sequence = builder_.getOriginalText();
    final int offset = builder_.getCurrentOffset();
    final int endOffset = offset + text.length();
    CharSequence tokenText = sequence.subSequence(offset, Math.min(endOffset, sequence.length()));

    if (Comparing.equal(text, tokenText, caseSensitive)) {
      int count = 0;
      while (true) {
        final int nextOffset = builder_.rawTokenTypeStart(++count);
        if (nextOffset > endOffset) {
          return false;
        } else if (nextOffset == endOffset) {
          break;
        }
      }
      while (count-- > 0) builder_.advanceLexer();
      return true;
    }
    return false;
  }
 public static int getIndentationOfPreviousToken(PsiBuilder builder) {
   // getTokenType has some side effects. Do not remove the call.
   builder.getTokenType();
   int end = builder.rawTokenTypeStart(0);
   return getLastIndentation(builder.getOriginalText().subSequence(0, end));
 }