Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : /*
       7             : 
       8             :   Implementations for a bunch of useful RDF utility routines.  Many of
       9             :   these will eventually be exported outside of RDF.DLL via the
      10             :   nsIRDFService interface.
      11             : 
      12             :   TO DO
      13             : 
      14             :   1) Make this so that it doesn't permanently leak the RDF service
      15             :      object.
      16             : 
      17             :   2) Make container functions thread-safe. They currently don't ensure
      18             :      that the RDF:nextVal property is maintained safely.
      19             : 
      20             :  */
      21             : 
      22             : #include "nsCOMPtr.h"
      23             : #include "nsIRDFDataSource.h"
      24             : #include "nsIRDFNode.h"
      25             : #include "nsIRDFService.h"
      26             : #include "nsIServiceManager.h"
      27             : #include "nsIURL.h"
      28             : #include "nsIIOService.h"
      29             : #include "nsIURL.h"
      30             : #include "nsRDFCID.h"
      31             : #include "nsString.h"
      32             : #include "nsXPIDLString.h"
      33             : #include "nsUnicharUtils.h"
      34             : #include "rdfutil.h"
      35             : #include "prtime.h"
      36             : 
      37             : ////////////////////////////////////////////////////////////////////////
      38             : 
      39             : nsresult
      40           0 : rdf_MakeRelativeRef(const nsACString& aBaseURI, nsCString& aURI)
      41             : {
      42             :     // This implementation is extremely simple: e.g., it can't compute
      43             :     // relative paths, or anything fancy like that. If the context URI
      44             :     // is not a prefix of the URI in question, we'll just bail.
      45           0 :     uint32_t prefixLen = aBaseURI.Length();
      46           0 :     if (prefixLen != 0 && StringBeginsWith(aURI, aBaseURI)) {
      47           0 :         if (prefixLen < aURI.Length() && aURI.CharAt(prefixLen) == '/')
      48           0 :             ++prefixLen; // chop the leading slash so it's not `absolute'
      49             : 
      50           0 :         aURI.Cut(0, prefixLen);
      51             :     }
      52             : 
      53           0 :     return NS_OK;
      54             : }
      55             : 
      56             : void
      57           0 : rdf_FormatDate(PRTime aTime, nsACString &aResult)
      58             : {
      59             :     // Outputs Unixish date in GMT plus usecs; e.g.,
      60             :     //   Wed Jan  9 19:15:13 2002 +002441
      61             :     //
      62             :     PRExplodedTime t;
      63           0 :     PR_ExplodeTime(aTime, PR_GMTParameters, &t);
      64             : 
      65             :     char buf[256];
      66           0 :     PR_FormatTimeUSEnglish(buf, sizeof buf, "%a %b %d %H:%M:%S %Y", &t);
      67           0 :     aResult.Append(buf);
      68             : 
      69             :     // usecs
      70           0 :     aResult.AppendLiteral(" +");
      71           0 :     int32_t usec = t.tm_usec;
      72           0 :     for (int32_t digit = 100000; digit > 1; digit /= 10) {
      73           0 :         aResult.Append(char('0' + (usec / digit)));
      74           0 :         usec %= digit;
      75             :     }
      76           0 :     aResult.Append(char('0' + usec));
      77           0 : }
      78             : 
      79             : PRTime
      80           0 : rdf_ParseDate(const nsACString &aTime)
      81             : {
      82             :     PRTime t;
      83           0 :     PR_ParseTimeString(PromiseFlatCString(aTime).get(), true, &t);
      84             : 
      85           0 :     int32_t usec = 0;
      86             : 
      87           0 :     nsACString::const_iterator begin, digit, end;
      88           0 :     aTime.BeginReading(begin);
      89           0 :     aTime.EndReading(end);
      90             : 
      91             :     // Walk backwards until we find a `+', run out of string, or a
      92             :     // non-numeric character.
      93           0 :     digit = end;
      94           0 :     while (--digit != begin && *digit != '+') {
      95           0 :         if (*digit < '0' || *digit > '9')
      96           0 :             break;
      97             :     }
      98             : 
      99           0 :     if (digit != begin && *digit == '+') {
     100             :         // There's a usec field specified (or, at least, something
     101             :         // that looks close enough. Parse it, and add it to the time.
     102           0 :         while (++digit != end) {
     103           0 :             usec *= 10;
     104           0 :             usec += *digit - '0';
     105             :         }
     106             : 
     107           0 :         t += usec;
     108             :     }
     109             : 
     110           0 :     return t;
     111             : }