private Token tryReadNumber()

in fontbox/src/main/java/org/apache/fontbox/type1/Type1Lexer.java [254:373]
95 lines of code
21 McCabe index (conditional complexity)

    private Token tryReadNumber() throws IOException
    {
        buffer.mark();

        StringBuilder sb = new StringBuilder();
        StringBuilder radix = null;
        char c = getChar();
        boolean hasDigit = false;

        // optional + or -
        if (c == '+' || c == '-')
        {
            sb.append(c);
            c = getChar();
        }

        // optional digits
        while (Character.isDigit(c))
        {
            sb.append(c);
            c = getChar();
            hasDigit = true;
        }

        // optional .
        if (c == '.')
        {
            sb.append(c);
            c = getChar();
        }
        else if (c == '#')
        {
            // PostScript radix number takes the form base#number
            radix = sb;
            sb = new StringBuilder();
            c = getChar();
        }
        else if (sb.length() == 0 || !hasDigit)
        {
            // failure
            buffer.reset();
            return null;
        }
        else if (c != 'e' && c != 'E')
        {
            // integer
            buffer.position(buffer.position() -1);
            return new Token(sb.toString(), Token.INTEGER);
        }

        // required digit
        if (Character.isDigit(c))
        {
            sb.append(c);
            c = getChar();
        }
        else if (c != 'e' && c != 'E')
        {
            // failure
            buffer.reset();
            return null;
        }

        // optional digits
        while (Character.isDigit(c))
        {
            sb.append(c);
            c = getChar();
        }

        // optional E
        if (c == 'E' || c == 'e')
        {
            sb.append(c);
            c = getChar();
            
            // optional minus
            if (c == '-')
            {
                sb.append(c);
                c = getChar();
            }

            // required digit
            if (Character.isDigit(c))
            {
                sb.append(c);
                c = getChar();
            }
            else
            {
                // failure
                buffer.reset();
                return null;
            }

            // optional digits
            while (Character.isDigit(c))
            {
                sb.append(c);
                c = getChar();
            }
        }
        
        buffer.position(buffer.position() - 1);
        if (radix != null)
        {
            int val;
            try
            {
                val = Integer.parseInt(sb.toString(), Integer.parseInt(radix.toString()));
            }
            catch (NumberFormatException ex)
            {
                throw new IOException("Invalid number '" + sb + "'", ex);
            }
            return new Token(Integer.toString(val), Token.INTEGER);
        }
        return new Token(sb.toString(), Token.REAL);
    }