CommentHelper.java

package jetbrains.mps.ide.java.newparser;

/*Generated by MPS */

import java.util.List;
import jetbrains.mps.internal.collections.runtime.ListSequence;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.ListIterator;
import jetbrains.mps.internal.collections.runtime.Sequence;

public class CommentHelper {
  public CommentHelper() {
  }
  public static List<String> splitString(char[] content, int[] lineends, int start, int end) {
    List<String> result = ListSequence.fromList(new ArrayList<String>());
    for (int i = Math.abs(Arrays.binarySearch(lineends, start) + 1); i < lineends.length && lineends[i] <= end; ++i) {
      ListSequence.fromList(result).addElement(new String(content, start, lineends[i] - start));
      start = lineends[i] + 1;
    }
    if (start < end) {
      ListSequence.fromList(result).addElement(new String(content, start, end - start));
    }
    return result;
  }
  public static List<String> processLines(Iterable<String> lines, String start, String end) {
    // remove start and end (if any) tags, indent 
    List<String> result = ListSequence.fromListWithValues(new ArrayList<String>(), lines);
    if (ListSequence.fromList(result).isEmpty()) {
      return result;
    }
    // remove start prefix 
    if (trim_rf742u_a0a4a2(ListSequence.fromList(result).first()).equals(start)) {
      ListSequence.fromList(result).removeElementAt(0);
    } else if (ListSequence.fromList(result).first().startsWith(start)) {
      String trimmed = ListSequence.fromList(result).getElement(0).substring(start.length());
      if (trimmed.startsWith(" ")) {
        trimmed = trimmed.substring(1);
      }
      ListSequence.fromList(result).setElement(0, trimmed);
    }
    if (ListSequence.fromList(result).isEmpty()) {
      return result;
    }
    if ((end != null && end.length() > 0)) {
      if (trim_rf742u_a0a0a6a2(ListSequence.fromList(result).last()).equals(end)) {
        ListSequence.fromList(result).removeLastElement();
      } else if (ListSequence.fromList(result).last().endsWith(end)) {
        String trimmed = ListSequence.fromList(result).last();
        trimmed = trimmed.substring(0, trimmed.length() - end.length());
        ListSequence.fromList(result).setElement(ListSequence.fromList(result).count() - 1, trimmed);
      }
    }

    // find common indent for nonempty lines 
    if (ListSequence.fromList(result).isNotEmpty()) {
      int mintrim = ListSequence.fromList(result).first().length();
      for (String line : result) {
        if ((line != null && line.length() > 0)) {
          mintrim = Math.min(mintrim, whitespaceOrStar(line));
        }
      }
      boolean trimok = mintrim > 0;
      String prefix = ListSequence.fromList(result).first().substring(0, mintrim);
      for (String line : result) {
        if ((line != null && line.length() > 0)) {
          trimok = trimok && line.startsWith(prefix);
        }
      }
      ListIterator<String> iter = ((List<String>) result).listIterator();
      while (iter.hasNext()) {
        String line = iter.next();
        iter.set((trimok && (line != null && line.length() > 0) ? line.substring(mintrim) : line));
      }
    }
    return result;
  }
  public static List<String> processJavadoc(Iterable<String> lines) {
    return processLines(lines, "/**", "*/");
  }
  public static List<String> processComment(Iterable<String> lines) {
    if (Sequence.fromIterable(lines).first().startsWith("//")) {
      return processLines(lines, "//", null);
    } else {
      return processLines(lines, "/*", "*/");
    }
  }

  private static int whitespaceOrStar(String s) {
    char[] chars = s.toCharArray();
    boolean wasStar = false;
    int k = 0;
    for (; k < chars.length; k++) {
      char c = chars[k];
      boolean stillWhitespace = Character.isWhitespace(c) || c == '*' && !(wasStar);
      if (!(stillWhitespace)) {
        return k;
      }
      wasStar = wasStar || c == '*';
    }
    return k;
  }
  public static String trim_rf742u_a0a4a2(String str) {
    return (str == null ? null : str.trim());
  }
  public static String trim_rf742u_a0a0a6a2(String str) {
    return (str == null ? null : str.trim());
  }
}