import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

rdf/base/rdfutil.cpp

@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+
+  Implementations for a bunch of useful RDF utility routines.  Many of
+  these will eventually be exported outside of RDF.DLL via the
+  nsIRDFService interface.
+
+  TO DO
+
+  1) Make this so that it doesn't permanently leak the RDF service
+     object.
+
+  2) Make container functions thread-safe. They currently don't ensure
+     that the RDF:nextVal property is maintained safely.
+
+ */
+
+#include "nsCOMPtr.h"
+#include "nsIRDFDataSource.h"
+#include "nsIRDFNode.h"
+#include "nsIRDFService.h"
+#include "nsIServiceManager.h"
+#include "nsIURL.h"
+#include "nsIIOService.h"
+#include "nsIURL.h"
+#include "nsRDFCID.h"
+#include "nsString.h"
+#include "nsXPIDLString.h"
+#include "nsUnicharUtils.h"
+#include "rdfutil.h"
+#include "prtime.h"
+
+////////////////////////////////////////////////////////////////////////
+
+nsresult
+rdf_MakeRelativeRef(const nsCSubstring& aBaseURI, nsCString& aURI)
+{
+    // This implementation is extremely simple: e.g., it can't compute
+    // relative paths, or anything fancy like that. If the context URI
+    // is not a prefix of the URI in question, we'll just bail.
+    uint32_t prefixLen = aBaseURI.Length();
+    if (prefixLen != 0 && StringBeginsWith(aURI, aBaseURI)) {
+        if (prefixLen < aURI.Length() && aURI.CharAt(prefixLen) == '/')
+            ++prefixLen; // chop the leading slash so it's not `absolute'
+
+        aURI.Cut(0, prefixLen);
+    }
+
+    return NS_OK;
+}
+
+void
+rdf_FormatDate(PRTime aTime, nsACString &aResult)
+{
+    // Outputs Unixish date in GMT plus usecs; e.g.,
+    //   Wed Jan  9 19:15:13 2002 +002441
+    //
+    PRExplodedTime t;
+    PR_ExplodeTime(aTime, PR_GMTParameters, &t);
+
+    char buf[256];
+    PR_FormatTimeUSEnglish(buf, sizeof buf, "%a %b %d %H:%M:%S %Y", &t);
+    aResult.Append(buf);
+
+    // usecs
+    aResult.AppendLiteral(" +");
+    int32_t usec = t.tm_usec;
+    for (int32_t digit = 100000; digit > 1; digit /= 10) {
+        aResult.Append(char('0' + (usec / digit)));
+        usec %= digit;
+    }
+    aResult.Append(char('0' + usec));
+}
+
+PRTime
+rdf_ParseDate(const nsACString &aTime)
+{
+    PRTime t;
+    PR_ParseTimeString(PromiseFlatCString(aTime).get(), true, &t);
+
+    int32_t usec = 0;
+
+    nsACString::const_iterator begin, digit, end;
+    aTime.BeginReading(begin);
+    aTime.EndReading(end);
+
+    // Walk backwards until we find a `+', run out of string, or a
+    // non-numeric character.
+    digit = end;
+    while (--digit != begin && *digit != '+') {
+        if (*digit < '0' || *digit > '9')
+            break;
+    }
+
+    if (digit != begin && *digit == '+') {
+        // There's a usec field specified (or, at least, something
+        // that looks close enough. Parse it, and add it to the time.
+        while (++digit != end) {
+            usec *= 10;
+            usec += *digit - '0';
+        }
+
+        t += usec;
+    }
+
+    return t;
+}