Method scan

src/main/java/org/fgn/lexan/Scanner.java:20–62

()

    // TODO: Optimize by recursive splitting

    public List<String> scan() throws ScannerException {

        List<String> result = new ArrayList<>();

        final char [] statementChars = statement.toCharArray();

        while (index < statementChars.length) {

            char ch = statementChars[index];

            if (Character.isDigit(ch)) {
                result.add(getNextToken(Character::isDigit));
                continue;
            } else if (Character.isAlphabetic(ch)) {
                result.add(getNextToken(Character::isAlphabetic));
                continue;
            } else if (ch == ':' || ch == '(' || ch == ')' || ch == '!' || ch == '\'') {
                result.add(String.valueOf(ch));
            } else if (ch == '-') {
                result.add(getNextToken("->"));
                continue;
            } else if (ch == '=') {
                result.add(getNextToken("=>"));
                continue;
            } else if (ch == '>') {
                result.add(getNextToken(">>"));
                continue;
            } else if (ch == '#') {
                result.add(String.valueOf(ch));
                result.add(statement.substring(index + 1));
                return result;
            } else if (Character.isWhitespace(ch)) {
                index++;
                continue;
            } else {
                throw new ScannerException(String.valueOf(ch));
            }

            index++;
        }

        return result;
    }

    private String getNextToken(String token) throws ScannerException {