public static String deflow()

in mailet/base/src/main/java/org/apache/mailet/base/FlowedMessageUtils.java [73:154]
63 lines of code
23 McCabe index (conditional complexity)

    public static String deflow(String text, boolean delSp) {
        String[] lines = text.split("\r\n|\n", -1);
        StringBuffer result = null;
        StringBuffer resultLine = new StringBuffer();
        int resultLineQuoteDepth = 0;
        boolean resultLineFlowed = false;
        // One more cycle, to close the last line
        for (int i = 0; i <= lines.length; i++) {
            String line = i < lines.length ? lines[i] : null;
            int actualQuoteDepth = 0;
            
            if (line != null) {
                if (line.equals(RFC2646_SIGNATURE)) {
                    // signature handling (the previous line is not flowed)
                    resultLineFlowed = false;
                } else if (line.length() > 0 && line.charAt(0) == RFC2646_QUOTE) {
                    // Quote
                    actualQuoteDepth = 1;
                    while (actualQuoteDepth < line.length() && line.charAt(actualQuoteDepth) == RFC2646_QUOTE) {
                        actualQuoteDepth++;
                    }
                    // if quote-depth changes wrt the previous line then this is not flowed
                    if (resultLineQuoteDepth != actualQuoteDepth) {
                        resultLineFlowed = false;
                    }
                    line = line.substring(actualQuoteDepth);
                    
                } else {
                    // if quote-depth changes wrt the first line then this is not flowed
                    if (resultLineQuoteDepth > 0) {
                        resultLineFlowed = false;
                    }
                }
                    
                if (line.length() > 0 && line.charAt(0) == RFC2646_SPACE) {
                    // Line space-stuffed
                    line = line.substring(1);
                }
                
            // if the previous was the last then it was not flowed
            } else {
                resultLineFlowed = false;
            }

            // Add the PREVIOUS line.
            // This often will find the flow looking for a space as the last char of the line.
            // With quote changes or signatures it could be the following line to void the flow.
            if (!resultLineFlowed && i > 0) {
                if (resultLineQuoteDepth > 0) {
                    resultLine.insert(0, RFC2646_SPACE);
                }
                for (int j = 0; j < resultLineQuoteDepth; j++) {
                    resultLine.insert(0, RFC2646_QUOTE);
                }
                if (result == null) {
                    result = new StringBuffer();
                } else {
                    result.append(RFC2646_CRLF);
                }
                result.append(resultLine.toString());
                resultLine = new StringBuffer();
                resultLineFlowed = false;
            }
            resultLineQuoteDepth = actualQuoteDepth;
            
            if (line != null) {
                if (!line.equals(RFC2646_SIGNATURE) && line.endsWith("" + RFC2646_SPACE) && i < lines.length - 1) {
                    // Line flowed (NOTE: for the split operation the line having i == lines.length is the last that does not end with RFC2646_CRLF)
                    if (delSp) {
                        line = line.substring(0, line.length() - 1);
                    }
                    resultLineFlowed = true;
                } else {
                    resultLineFlowed = false;
                }
                
                resultLine.append(line);
            }
        }
        
        return result.toString();
    }