public static String FTLStringLiteralDec()

in freemarker-core/src/main/java/freemarker/template/utility/StringUtil.java [559:662]

• 101 lines of code
• 27 McCabe index (conditional complexity)

    public static String FTLStringLiteralDec(String s) throws ParseException {

        int idx = s.indexOf('\\');
        if (idx == -1) {
            return s;
        }

        int lidx = s.length() - 1;
        int bidx = 0;
        StringBuilder buf = new StringBuilder(lidx);
        do {
            buf.append(s.substring(bidx, idx));
            if (idx >= lidx) {
                throw new ParseException("The last character of string literal is backslash", 0,0);
            }
            char c = s.charAt(idx + 1);
            switch (c) {
                case '"':
                    buf.append('"');
                    bidx = idx + 2;
                    break;
                case '\'':
                    buf.append('\'');
                    bidx = idx + 2;
                    break;
                case '\\':
                    buf.append('\\');
                    bidx = idx + 2;
                    break;
                case 'n':
                    buf.append('\n');
                    bidx = idx + 2;
                    break;
                case 'r':
                    buf.append('\r');
                    bidx = idx + 2;
                    break;
                case 't':
                    buf.append('\t');
                    bidx = idx + 2;
                    break;
                case 'f':
                    buf.append('\f');
                    bidx = idx + 2;
                    break;
                case 'b':
                    buf.append('\b');
                    bidx = idx + 2;
                    break;
                case 'g':
                    buf.append('>');
                    bidx = idx + 2;
                    break;
                case 'l':
                    buf.append('<');
                    bidx = idx + 2;
                    break;
                case 'a':
                    buf.append('&');
                    bidx = idx + 2;
                    break;
                case '{':
                case '=':
                    buf.append(c);
                    bidx = idx + 2;
                    break;
                case 'x': {
                    idx += 2;
                    int x = idx;
                    int y = 0;
                    int z = lidx > idx + 3 ? idx + 3 : lidx;
                    while (idx <= z) {
                        char b = s.charAt(idx);
                        if (b >= '0' && b <= '9') {
                            y <<= 4;
                            y += b - '0';
                        } else if (b >= 'a' && b <= 'f') {
                            y <<= 4;
                            y += b - 'a' + 10;
                        } else if (b >= 'A' && b <= 'F') {
                            y <<= 4;
                            y += b - 'A' + 10;
                        } else {
                            break;
                        }
                        idx++;
                    }
                    if (x < idx) {
                        buf.append((char) y);
                    } else {
                        throw new ParseException("Invalid \\x escape in a string literal",0,0);
                    }
                    bidx = idx;
                    break;
                }
                default:
                    throw new ParseException("Invalid escape sequence (\\" + c + ") in a string literal",0,0);
            }
            idx = s.indexOf('\\', bidx);
        } while (idx != -1);
        buf.append(s.substring(bidx));

        return buf.toString();
    }