public String next()

in gogo/runtime/src/main/java/org/apache/felix/gogo/runtime/Expression.java [565:624]
60 lines of code
39 McCabe index (conditional complexity)

        public String next() {
            StringBuilder token = new StringBuilder();
            if (pos >= input.length()) {
                return previousToken = null;
            }
            char ch = input.charAt(pos);
            while (Character.isWhitespace(ch) && pos < input.length()) {
                ch = input.charAt(++pos);
            }
            if (Character.isDigit(ch)) {
                while ((Character.isDigit(ch) || ch == decimalSeparator)
                        && (pos < input.length())) {
                    token.append(input.charAt(pos++));
                    ch = pos == input.length() ? 0 : input.charAt(pos);
                }
            } else if (ch == minusSign
                    && Character.isDigit(peekNextChar())
                    && ("(".equals(previousToken) || ",".equals(previousToken)
                    || previousToken == null || operators
                    .containsKey(previousToken))) {
                token.append(minusSign);
                pos++;
                token.append(next());
            } else if (Character.isLetter(ch)) {
                while ((Character.isLetter(ch) || Character.isDigit(ch) || (ch == '_')) && (pos < input.length())) {
                    token.append(input.charAt(pos++));
                    ch = pos == input.length() ? 0 : input.charAt(pos);
                }
            } else if (ch == '"') {
                boolean escaped = false;
                token.append(input.charAt(pos++));
                do {
                    if (pos == input.length()) {
                        throw new IllegalArgumentException("Non terminated quote");
                    }
                    ch = input.charAt(pos++);
                    escaped = (!escaped && ch == '\\');
                    token.append(ch);
                } while (escaped || ch != '"');
            } else if (ch == '(' || ch == ')' || ch == ',') {
                token.append(ch);
                pos++;
            } else {
                while (!Character.isLetter(ch) && !Character.isDigit(ch)
                        && !Character.isWhitespace(ch) && ch != '('
                        && ch != ')' && ch != ',' && (pos < input.length())) {
                    token.append(input.charAt(pos));
                    pos++;
                    ch = pos == input.length() ? 0 : input.charAt(pos);
                    if (ch == minusSign) {
                        break;
                    }
                }
                if (!operators.containsKey(token.toString())) {
                    throw new ExpressionException("Unknown operator '" + token
                            + "' at position " + (pos - token.length() + 1));
                }
            }
            return previousToken = token.toString();
        }