private static final String canonicalURI()

in src/main/java/org/apache/sling/scripting/jsp/jasper/JspCompilationContext.java [593:650]
39 lines of code
17 McCabe index (conditional complexity)

    private static final String canonicalURI(String s) {
       if (s == null) return null;
       StringBuilder result = new StringBuilder();
       final int len = s.length();
       int pos = 0;
       while (pos < len) {
           char c = s.charAt(pos);
           if ( isPathSeparator(c) ) {
               /*
                * multiple path separators.
                * 'foo///bar' -> 'foo/bar'
                */
               while (pos+1 < len && isPathSeparator(s.charAt(pos+1))) {
                   ++pos;
               }

               if (pos+1 < len && s.charAt(pos+1) == '.') {
                   /*
                    * a single dot at the end of the path - we are done.
                    */
                   if (pos+2 >= len) break;

                   switch (s.charAt(pos+2)) {
                       /*
                        * self directory in path
                        * foo/./bar -> foo/bar
                        */
                   case '/':
                   case '\\':
                       pos += 2;
                       continue;

                       /*
                        * two dots in a path: go back one hierarchy.
                        * foo/bar/../baz -> foo/baz
                        */
                   case '.':
                       // only if we have exactly _two_ dots.
                       if (pos+3 < len && isPathSeparator(s.charAt(pos+3))) {
                           pos += 3;
                           int separatorPos = result.length()-1;
                           while (separatorPos >= 0 &&
                                  ! isPathSeparator(result
                                                    .charAt(separatorPos))) {
                               --separatorPos;
                           }
                           if (separatorPos >= 0)
                               result.setLength(separatorPos);
                           continue;
                       }
                   }
               }
           }
           result.append(c);
           ++pos;
       }
       return result.toString();
    }