public static void tokenize()

in tools/device_broker/java/com/google/android/apps/common/testing/broker/shell/ShellUtils.java [90:143]

• 49 lines of code
• 19 McCabe index (conditional complexity)

  public static void tokenize(List<String> options, String optionString)
      throws TokenizationException {
    // See test suite for examples.
    //
    // Note: backslash escapes the following character, except within a
    // single-quoted region where it is literal.

    StringBuilder token = new StringBuilder();
    boolean forceToken = false;
    char quotation = '\0'; // NUL, '\'' or '"'
    for (int ii = 0, len = optionString.length(); ii < len; ii++) {
      char c = optionString.charAt(ii);
      if (quotation != '\0') { // in quotation
        if (c == quotation) { // end of quotation
          quotation = '\0';
        } else if (c == '\\' && quotation == '"') { // backslash in "-quotation
          if (++ii == len) {
            throw new TokenizationException("backslash at end of string");
          }
          c = optionString.charAt(ii);
          if (c != '\\' && c != '"') {
            token.append('\\');
          }
          token.append(c);
        } else { // regular char, in quotation
          token.append(c);
        }
      } else { // not in quotation
        if (c == '\'' || c == '"') { // begin single/double quotation
          quotation = c;
          forceToken = true;
        } else if (c == ' ' || c == '\t') { // space, not quoted
          if (forceToken || token.length() > 0) {
            options.add(token.toString());
            token = new StringBuilder();
            forceToken = false;
          }
        } else if (c == '\\') { // backslash, not quoted
          if (++ii == len) {
            throw new TokenizationException("backslash at end of string");
          }
          token.append(optionString.charAt(ii));
        } else { // regular char, not quoted
          token.append(c);
        }
      }
    }
    if (quotation != '\0') {
      throw new TokenizationException("unterminated quotation");
    }
    if (forceToken || token.length() > 0) {
      options.add(token.toString());
    }
  }