PropEscapeUtil.java

package jetbrains.mps.core.properties.util;

/*Generated by MPS */


public class PropEscapeUtil {
  private static final char[] hexDigit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
  public PropEscapeUtil() {
  }
  public static String escapeKey(String text) {
    return (text == null ? "" : escape(text, true, true));
  }
  public static String escapeValue(String text) {
    return (text == null ? "" : escape(text, false, true));
  }
  private static String escape(String text, boolean escapeSpace, boolean escapeUnicode) {
    int len = text.length();
    int bufLen = len * 2;
    if (bufLen < 0) {
      bufLen = Integer.MAX_VALUE;
    }
    StringBuilder outBuffer = new StringBuilder(bufLen);
    for (int x = 0; x < len; x++) {
      char aChar = text.charAt(x);
      //  Handle common case first, selecting largest block that 
      //  avoids the specials below 
      if ((aChar > 61) && (aChar < 127)) {
        if (aChar == '\\') {
          outBuffer.append('\\');
          outBuffer.append('\\');
          continue;
        }
        outBuffer.append(aChar);
        continue;
      }
      switch (aChar) {
        case ' ':
          if (x == 0 || escapeSpace) {
            outBuffer.append('\\');
          }
          outBuffer.append(' ');
          break;
        case '\t':
          outBuffer.append('\\');
          outBuffer.append('t');
          break;
        case '\n':
          outBuffer.append('\\');
          outBuffer.append('n');
          break;
        case '\r':
          outBuffer.append('\\');
          outBuffer.append('r');
          break;
        case '\f':
          outBuffer.append('\\');
          outBuffer.append('f');
          break;
        case '=':
          //  Fall through 
        case ':':
          //  Fall through 
        case '#':
          //  Fall through 
        case '!':
          outBuffer.append('\\');
          outBuffer.append(aChar);
          break;
        default:
          if (((aChar < 32) || (aChar > 126)) & escapeUnicode) {
            outBuffer.append('\\');
            outBuffer.append('u');
            outBuffer.append(toHex((aChar >> 12) & 15));
            outBuffer.append(toHex((aChar >> 8) & 15));
            outBuffer.append(toHex((aChar >> 4) & 15));
            outBuffer.append(toHex(aChar & 15));

          } else {
            outBuffer.append(aChar);
          }
      }
    }
    return outBuffer.toString();
  }
  private static char toHex(int nibble) {
    return PropEscapeUtil.hexDigit[(nibble & 15)];
  }
  public static String escapeComment(String text) {
    int len = text.length();
    int bufLen = len * 2;
    if (bufLen < 0) {
      bufLen = Integer.MAX_VALUE;
    }
    StringBuilder outBuffer = new StringBuilder(bufLen);
    for (int x = 0; x < len; x++) {
      char aChar = text.charAt(x);
      switch (aChar) {
        case '\\':
          outBuffer.append('\\');
          outBuffer.append('\\');
          break;
        case '\n':
          outBuffer.append('\\');
          outBuffer.append('n');
          break;
        case '\r':
          outBuffer.append('\\');
          outBuffer.append('r');
          break;
        case '\f':
          outBuffer.append('\\');
          outBuffer.append('f');
          break;
        default:
          if (((aChar < 32) || (aChar > 126))) {
            outBuffer.append('\\');
            outBuffer.append('u');
            outBuffer.append(toHex((aChar >> 12) & 15));
            outBuffer.append(toHex((aChar >> 8) & 15));
            outBuffer.append(toHex((aChar >> 4) & 15));
            outBuffer.append(toHex(aChar & 15));

          } else {
            outBuffer.append(aChar);
          }
      }
    }
    return outBuffer.toString();
  }
}