private static String FTLStringLiteralEnc()

in freemarker-core/src/main/java/freemarker/template/utility/StringUtil.java [472:535]
59 lines of code
24 McCabe index (conditional complexity)

    private static String FTLStringLiteralEnc(String s, char quotation, boolean addQuotation) {
        final int ln = s.length();
        
        final char otherQuotation;
        if (quotation == 0) {
            otherQuotation = 0;
        } else if (quotation == '"') {
            otherQuotation = '\'';
        } else if (quotation == '\'') {
            otherQuotation = '"';
        } else {
            throw new IllegalArgumentException("Unsupported quotation character: " + quotation);
        }
        
        final int escLn = ESCAPES.length;
        StringBuilder buf = null;
        for (int i = 0; i < ln; i++) {
            char c = s.charAt(i);
            char escape;
            if (c == '=') {
                escape = i > 0 && s.charAt(i - 1) == '[' ? '=' : 0;
            } else if (c < escLn) {
                escape = ESCAPES[c]; //
            } else if (c == '{' && i > 0 && isInterpolationStart(s.charAt(i - 1))) {
                escape = '{';
            } else {
                escape = 0;
            }
            if (escape == 0 || escape == otherQuotation) {
                if (buf != null) {
                    buf.append(c);
                }
            } else {
                if (buf == null) {
                    buf = new StringBuilder(s.length() + 4 + (addQuotation ? 2 : 0));
                    if (addQuotation) {
                        buf.append(quotation);
                    }
                    buf.append(s.substring(0, i));
                }
                if (escape == 1) {
                    // hex encoding for characters below 0x20
                    // that have no other escape representation
                    buf.append("\\x00");
                    int c2 = (c >> 4) & 0x0F;
                    c = (char) (c & 0x0F);
                    buf.append((char) (c2 < 10 ? c2 + '0' : c2 - 10 + 'A'));
                    buf.append((char) (c < 10 ? c + '0' : c - 10 + 'A'));
                } else {
                    buf.append('\\');
                    buf.append(escape);
                }
            }
        }
        
        if (buf == null) {
            return addQuotation ? quotation + s + quotation : s;
        } else {
            if (addQuotation) {
                buf.append(quotation);
            }
            return buf.toString();
        }
    }