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112 lines
3.0 KiB
C++
112 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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Implementations for a bunch of useful RDF utility routines. Many of
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these will eventually be exported outside of RDF.DLL via the
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nsIRDFService interface.
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TO DO
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1) Make this so that it doesn't permanently leak the RDF service
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object.
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2) Make container functions thread-safe. They currently don't ensure
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that the RDF:nextVal property is maintained safely.
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*/
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#include "nsCOMPtr.h"
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#include "nsIRDFDataSource.h"
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#include "nsIRDFNode.h"
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#include "nsIRDFService.h"
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#include "nsIServiceManager.h"
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#include "nsIURL.h"
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#include "nsIIOService.h"
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#include "nsIURL.h"
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#include "nsRDFCID.h"
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#include "nsString.h"
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#include "nsXPIDLString.h"
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#include "nsUnicharUtils.h"
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#include "rdfutil.h"
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#include "prtime.h"
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////////////////////////////////////////////////////////////////////////
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nsresult
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rdf_MakeRelativeRef(const nsCSubstring& aBaseURI, nsCString& aURI)
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{
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// This implementation is extremely simple: e.g., it can't compute
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// relative paths, or anything fancy like that. If the context URI
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// is not a prefix of the URI in question, we'll just bail.
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uint32_t prefixLen = aBaseURI.Length();
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if (prefixLen != 0 && StringBeginsWith(aURI, aBaseURI)) {
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if (prefixLen < aURI.Length() && aURI.CharAt(prefixLen) == '/')
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++prefixLen; // chop the leading slash so it's not `absolute'
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aURI.Cut(0, prefixLen);
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}
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return NS_OK;
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}
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void
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rdf_FormatDate(PRTime aTime, nsACString &aResult)
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{
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// Outputs Unixish date in GMT plus usecs; e.g.,
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// Wed Jan 9 19:15:13 2002 +002441
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//
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PRExplodedTime t;
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PR_ExplodeTime(aTime, PR_GMTParameters, &t);
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char buf[256];
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PR_FormatTimeUSEnglish(buf, sizeof buf, "%a %b %d %H:%M:%S %Y", &t);
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aResult.Append(buf);
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// usecs
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aResult.AppendLiteral(" +");
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int32_t usec = t.tm_usec;
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for (int32_t digit = 100000; digit > 1; digit /= 10) {
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aResult.Append(char('0' + (usec / digit)));
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usec %= digit;
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}
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aResult.Append(char('0' + usec));
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}
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PRTime
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rdf_ParseDate(const nsACString &aTime)
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{
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PRTime t;
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PR_ParseTimeString(PromiseFlatCString(aTime).get(), true, &t);
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int32_t usec = 0;
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nsACString::const_iterator begin, digit, end;
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aTime.BeginReading(begin);
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aTime.EndReading(end);
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// Walk backwards until we find a `+', run out of string, or a
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// non-numeric character.
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digit = end;
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while (--digit != begin && *digit != '+') {
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if (*digit < '0' || *digit > '9')
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break;
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}
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if (digit != begin && *digit == '+') {
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// There's a usec field specified (or, at least, something
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// that looks close enough. Parse it, and add it to the time.
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while (++digit != end) {
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usec *= 10;
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usec += *digit - '0';
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}
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t += usec;
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}
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return t;
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}
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