private String expandMacroString()

in resolver/src/main/java/org/apache/james/jspf/core/MacroExpand.java [264:311]
34 lines of code
10 McCabe index (conditional complexity)

    private String expandMacroString(String input, MacroData macroData, boolean isExplanation) throws PermErrorException, RequireClientDomainException {

        StringBuffer decodedValue = new StringBuffer();
        Matcher inputMatcher = macroStringPattern.matcher(input);
        String macroCell;
        int pos = 0;

        while (inputMatcher.find()) {
            String match2 = inputMatcher.group();
            if (pos != inputMatcher.start()) {
                throw new PermErrorException("Middle part does not match: "+input.substring(0,pos)+">>"+input.substring(pos, inputMatcher.start())+"<<"+input.substring(inputMatcher.start())+" ["+input+"]");
            }
            if (match2.length() > 0) {
                if (match2.startsWith("%{")) {
                    macroCell = input.substring(inputMatcher.start() + 2, inputMatcher
                            .end() - 1);
                    inputMatcher
                            .appendReplacement(decodedValue, escapeForMatcher(replaceCell(macroCell, macroData, isExplanation)));
                } else if (match2.length() == 2 && match2.startsWith("%")) {
                    // handle the % escaping
                    /*
                     * From RFC4408:
                     * 
                     * A literal "%" is expressed by "%%".
                     *   "%_" expands to a single " " space.
                     *   "%-" expands to a URL-encoded space, viz., "%20".
                     */
                    if ("%_".equals(match2)) {
                        inputMatcher.appendReplacement(decodedValue, " ");
                    } else if ("%-".equals(match2)) {
                        inputMatcher.appendReplacement(decodedValue, "%20");
                    } else {
                        inputMatcher.appendReplacement(decodedValue, escapeForMatcher(match2.substring(1)));
                    }
                }
            }
            
            pos = inputMatcher.end();
        }
        
        if (input.length() != pos) {
            throw new PermErrorException("End part does not match: "+input.substring(pos));
        }
        
        inputMatcher.appendTail(decodedValue);

        return decodedValue.toString();
    }