private int next()

in solr/solrj/src/java/org/noggit/JSONParser.java [881:1019]

• 130 lines of code
• 48 McCabe index (conditional complexity)

  private int next(int ch) throws IOException {
    // TODO: try my own form of indirect jump... look up char class and index directly into handling
    // implementation?
    for (; ; ) {
      switch (ch) {
          // this is not the exclusive list of whitespace chars... the rest are handled in default:
        case ' ':
        case '\t':
        case '\r':
        case '\n':
          // calling getCharNWS here seems faster than letting the switch handle it
          ch = getCharNWS();
          break;
        case '"':
          stringTerm = '"';
          valstate = STRING;
          return STRING;
        case '\'':
          if ((flags & ALLOW_SINGLE_QUOTES) == 0) {
            throw err("Single quoted strings not allowed");
          }
          stringTerm = '\'';
          valstate = STRING;
          return STRING;
        case '{':
          push();
          state = DID_OBJSTART;
          return OBJECT_START;
        case '[':
          push();
          state = DID_ARRSTART;
          return ARRAY_START;
        case '0':
          out.reset();
          // special case '0'?  If next char isn't '.' val=0
          ch = getChar();
          if (ch == '.') {
            start--;
            ch = '0';
            readNumber('0', false);
            return valstate;
          } else if (ch > '9' || ch < '0') {
            out.unsafeWrite('0');
            if (ch != -1) start--;
            lval = 0;
            valstate = LONG;
            return LONG;
          } else {
            throw err("Leading zeros not allowed");
          }
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
          out.reset();
          lval = readNumber(ch, false);
          return valstate;
        case '-':
          out.reset();
          out.unsafeWrite('-');
          ch = getChar();
          if (ch < '0' || ch > '9') throw err("expected digit after '-'");
          lval = readNumber(ch, true);
          return valstate;
        case 't':
          // TODO: test performance of this non-branching inline version.
          // if ((('r'-getChar())|('u'-getChar())|('e'-getChar())) != 0) throw err("");
          if (matchBareWord(JSONUtil.TRUE_CHARS)) {
            bool = true;
            valstate = BOOLEAN;
            return valstate;
          } else {
            valstate = STRING;
            return STRING;
          }
        case 'f':
          if (matchBareWord(JSONUtil.FALSE_CHARS)) {
            bool = false;
            valstate = BOOLEAN;
            return valstate;
          } else {
            valstate = STRING;
            return STRING;
          }
        case 'n':
          if (matchBareWord(JSONUtil.NULL_CHARS)) {
            valstate = NULL;
            return valstate;
          } else {
            valstate = STRING;
            return STRING;
          }
        case '/':
          getSlashComment();
          ch = getChar();
          break;
        case '#':
          getNewlineComment();
          ch = getChar();
          break;
        case ']': // This only happens with a trailing comma (or an error)
          if (state != DID_ARRELEM || (flags & ALLOW_EXTRA_COMMAS) == 0) {
            throw err("Unexpected array closer ]");
          }
          pop();
          return event = ARRAY_END;
        case '}': // This only happens with a trailing comma (or an error)
          if (state != DID_MEMVAL || (flags & ALLOW_EXTRA_COMMAS) == 0) {
            throw err("Unexpected object closer }");
          }
          pop();
          return event = ARRAY_END;
        case ',': // This only happens with input like [1,]
          if ((state != DID_ARRELEM && state != DID_MEMVAL) || (flags & ALLOW_EXTRA_COMMAS) == 0) {
            throw err("Unexpected comma");
          }
          ch = getChar();
          break;
        case -1:
          if (getLevel() > 0) throw err("Premature EOF");
          return EOF;
        default:
          // Handle unusual unicode whitespace like no-break space (0xA0)
          if (isWhitespace(ch)) {
            ch = getChar(); // getCharNWS() would also work
            break;
          }
          handleNonDoubleQuoteString(ch, false);
          valstate = STRING;
          return STRING;
          // throw err(null);
      }
    }
  }