4 files changed, 316 insertions, 6 deletions

diff --git a/src/WixToolset.Converters/WixConverter.cs b/src/WixToolset.Converters/WixConverter.cs
index 1ba28df3..c30a40ac 100644
--- a/src/WixToolset.Converters/WixConverter.cs
+++ b/src/WixToolset.Converters/WixConverter.cs
@@ -32,6 +32,7 @@ namespace WixToolset.Converters
         private static readonly XNamespace WixNamespace = "http://wixtoolset.org/schemas/v4/wxs";
         private static readonly XNamespace Wix3Namespace = "http://schemas.microsoft.com/wix/2006/wi";
         private static readonly XNamespace WixBalNamespace = "http://wixtoolset.org/schemas/v4/wxs/bal";
+        private static readonly XNamespace WixDependencyNamespace = "http://wixtoolset.org/schemas/v4/wxs/dependency";
         private static readonly XNamespace WixUtilNamespace = "http://wixtoolset.org/schemas/v4/wxs/util";
         private static readonly XNamespace WixFirewallNamespace = "http://wixtoolset.org/schemas/v4/wxs/firewall";
 
@@ -53,6 +54,9 @@ namespace WixToolset.Converters
         private static readonly XName CreateFolderElementName = WixNamespace + "CreateFolder";
         private static readonly XName CustomTableElementName = WixNamespace + "CustomTable";
         private static readonly XName DataElementName = WixNamespace + "Data";
+        private static readonly XName OldProvidesElementName = WixDependencyNamespace + "Provides";
+        private static readonly XName OldRequiresElementName = WixDependencyNamespace + "Requires";
+        private static readonly XName OldRequiresRefElementName = WixDependencyNamespace + "RequiresRef";
         private static readonly XName DirectoryElementName = WixNamespace + "Directory";
         private static readonly XName ErrorElementName = WixNamespace + "Error";
         private static readonly XName FeatureElementName = WixNamespace + "Feature";
@@ -72,6 +76,9 @@ namespace WixToolset.Converters
         private static readonly XName ProductElementName = WixNamespace + "Product";
         private static readonly XName ProgressTextElementName = WixNamespace + "ProgressText";
         private static readonly XName PublishElementName = WixNamespace + "Publish";
+        private static readonly XName ProvidesElementName = WixNamespace + "Provides";
+        private static readonly XName RequiresElementName = WixNamespace + "Requires";
+        private static readonly XName RequiresRefElementName = WixNamespace + "RequiresRef";
         private static readonly XName MultiStringValueElementName = WixNamespace + "MultiStringValue";
         private static readonly XName RemotePayloadElementName = WixNamespace + "RemotePayload";
         private static readonly XName RegistrySearchElementName = WixNamespace + "RegistrySearch";
@@ -106,11 +113,14 @@ namespace WixToolset.Converters
         private static readonly XName SummaryInformationElementName = WixNamespace + "SummaryInformation";
         private static readonly XName MediaTemplateElementName = WixNamespace + "MediaTemplate";
 
+        private static readonly XName DependencyCheckAttributeName = WixDependencyNamespace + "Check";
+        private static readonly XName DependencyEnforceAttributeName = WixDependencyNamespace + "Enforce";
+
         private static readonly Dictionary<string, XNamespace> OldToNewNamespaceMapping = new Dictionary<string, XNamespace>()
         {
             { "http://schemas.microsoft.com/wix/BalExtension", "http://wixtoolset.org/schemas/v4/wxs/bal" },
             { "http://schemas.microsoft.com/wix/ComPlusExtension", "http://wixtoolset.org/schemas/v4/wxs/complus" },
-            { "http://schemas.microsoft.com/wix/DependencyExtension", "http://wixtoolset.org/schemas/v4/wxs/dependency" },
+            { "http://schemas.microsoft.com/wix/DependencyExtension", WixDependencyNamespace },
             { "http://schemas.microsoft.com/wix/DifxAppExtension", "http://wixtoolset.org/schemas/v4/wxs/difxapp" },
             { "http://schemas.microsoft.com/wix/FirewallExtension", "http://wixtoolset.org/schemas/v4/wxs/firewall" },
             { "http://schemas.microsoft.com/wix/HttpExtension", "http://wixtoolset.org/schemas/v4/wxs/http" },
@@ -174,6 +184,9 @@ namespace WixToolset.Converters
                 { WixConverter.MsiPackageElementName, this.ConvertWindowsInstallerPackageElement },
                 { WixConverter.MspPackageElementName, this.ConvertWindowsInstallerPackageElement },
                 { WixConverter.MsuPackageElementName, this.ConvertSuppressSignatureValidation },
+                { WixConverter.OldProvidesElementName, this.ConvertProvidesElement },
+                { WixConverter.OldRequiresElementName, this.ConvertRequiresElement },
+                { WixConverter.OldRequiresRefElementName, this.ConvertRequiresRefElement },
                 { WixConverter.PayloadElementName, this.ConvertSuppressSignatureValidation },
                 { WixConverter.PermissionExElementName, this.ConvertPermissionExElement },
                 { WixConverter.ProductElementName, this.ConvertProductElement },
@@ -275,6 +288,7 @@ namespace WixToolset.Converters
 
             // Start converting the nodes at the top.
             this.ConvertNodes(document.Nodes(), 0);
+            this.RemoveUnusedNamspaces(document.Root);
 
             return this.Errors;
         }
@@ -327,6 +341,7 @@ namespace WixToolset.Converters
 
             // Start converting the nodes at the top.
             this.ConvertNodes(document.Nodes(), 0);
+            this.RemoveUnusedNamspaces(document.Root);
 
             return this.Errors;
         }
@@ -1136,6 +1151,50 @@ namespace WixToolset.Converters
 
         private void ConvertShortcutPropertyElement(XElement element) => this.ConvertInnerTextToAttribute(element, "Value");
 
+        private void ConvertProvidesElement(XElement element)
+        {
+            if (this.OnError(ConverterTestType.IntegratedDependencyNamespace, element, "The Provides element has been integrated into the WiX v4 namespace. Remove the namespace."))
+            {
+                element.Name = ProvidesElementName;
+            }
+
+            if (element.Parent.Name == ComponentElementName &&
+                this.OnError(ConverterTestType.IntegratedDependencyNamespace, element, "The Provides element has been integrated into the WiX v4 namespace. Add the 'Check' attribute from the WixDependency.wixext to match v3 runtime behavior."))
+            {
+                element.Add(new XAttribute(DependencyCheckAttributeName, "yes"));
+            }
+        }
+
+        private void ConvertRequiresElement(XElement element)
+        {
+            if (this.OnError(ConverterTestType.IntegratedDependencyNamespace, element, "The Requires element has been integrated into the WiX v4 namespace. Remove the namespace."))
+            {
+                element.Name = RequiresElementName;
+            }
+
+            if (element.Parent.Name == ProvidesElementName &&
+                element.Parent.Parent?.Name == ComponentElementName &&
+                this.OnError(ConverterTestType.IntegratedDependencyNamespace, element, "The Requires element has been integrated into the WiX v4 namespace. Add the 'Enforce' attribute from the WixDependency.wixext to match v3 runtime behavior."))
+            {
+                element.Add(new XAttribute(DependencyEnforceAttributeName, "yes"));
+            }
+        }
+
+        private void ConvertRequiresRefElement(XElement element)
+        {
+            if (this.OnError(ConverterTestType.IntegratedDependencyNamespace, element, "The RequiresRef element has been integrated into the WiX v4 namespace. Remove the namespace."))
+            {
+                element.Name = RequiresRefElementName;
+            }
+
+            if (element.Parent.Name == ProvidesElementName &&
+                element.Parent.Parent?.Name == ComponentElementName &&
+                this.OnError(ConverterTestType.IntegratedDependencyNamespace, element, "The RequiresRef element has been integrated into the WiX v4 namespace. Add the 'Enforce' attribute from the WixDependency.wixext to match v3 runtime behavior."))
+            {
+                element.Add(new XAttribute(DependencyEnforceAttributeName, "yes"));
+            }
+        }
+
         private void ConvertSuppressSignatureValidation(XElement element)
         {
             var suppressSignatureValidation = element.Attribute("SuppressSignatureValidation");
@@ -1149,7 +1208,7 @@ namespace WixToolset.Converters
 
         private void ConvertTagElement(XElement element)
         {
-            if (this.OnError(ConverterTestType.TagElementRenamed, element, "The Tag element has been renamed. Use the element 'SoftwareTag' name."))
+            if (this.OnError(ConverterTestType.TagElementRenamed, element, "The Tag element has been renamed. Use the 'SoftwareTag' element instead."))
             {
                 element.Name = SoftwareTagElementName;
             }
@@ -1311,6 +1370,10 @@ namespace WixToolset.Converters
                     element.Add(new XAttribute("Bitness", value));
                     win64.Remove();
                 }
+                //else if (this.OnError(ConverterTestType.BitnessAttributeRequired, element, "Use the Bitness attribute instead."))
+                //{
+                //    element.Add(new XAttribute("Bitness", "always32"));
+                //}
 
                 var result = element.Attribute("Result")?.Value;
                 if (result == null || result == "value")
@@ -1461,6 +1524,50 @@ namespace WixToolset.Converters
         }
 
         /// <summary>
+        /// Removes unused namespaces from the element and its children.
+        /// </summary>
+        /// <param name="root">Root element to start at.</param>
+        private void RemoveUnusedNamspaces(XElement root)
+        {
+            var declarations = new List<XAttribute>();
+            var namespaces = new HashSet<string>();
+
+            VisitElement(root, x =>
+            {
+                if (x is XAttribute a && a.IsNamespaceDeclaration)
+                {
+                    declarations.Add(a);
+                    namespaces.Add(a.Value);
+                }
+                return true;
+            });
+
+            foreach (var ns in namespaces.ToList())
+            {
+                VisitElement(root, x =>
+                {
+                    if ((x is XElement e && e.Name.Namespace == ns) ||
+                        (x is XAttribute a && !a.IsNamespaceDeclaration && a.Name.Namespace == ns))
+                    {
+                        namespaces.Remove(ns);
+                        return false;
+                    }
+
+                    return true;
+                });
+            }
+
+            foreach (var declaration in declarations)
+            {
+                if (namespaces.Contains(declaration.Value) &&
+                    this.OnError(ConverterTestType.RemoveUnusedNamespaces, declaration, "The namespace '{0}' is not used. Remove unused namespaces.", declaration.Value))
+                {
+                    declaration.Remove();
+                }
+            }
+        }
+
+        /// <summary>
         /// Output an error message to the console.
         /// </summary>
         /// <param name="converterTestType">The type of converter test.</param>
@@ -1601,6 +1708,21 @@ namespace WixToolset.Converters
             }
         }
 
+        private static bool VisitElement(XElement element, Func<XObject, bool> visitor)
+        {
+            if (!visitor(element))
+            {
+                return false;
+            }
+
+            if (!element.Attributes().All(a => visitor(a)))
+            {
+                return false;
+            }
+
+            return element.Elements().All(e => VisitElement(e, visitor));
+        }
+
         private static bool WasImplicitlyStringTyped(string value)
         {
             if (value == null)
@@ -1835,6 +1957,16 @@ namespace WixToolset.Converters
             /// The Tag element has been renamed. Use the element 'SoftwareTag' name.
             /// </summary>
             TagElementRenamed,
+
+            /// <summary>
+            /// The Dependency namespace has been incorporated into WiX v4 namespace.
+            /// </summary>
+            IntegratedDependencyNamespace,
+
+            /// <summary>
+            /// Remove unused namespaces.
+            /// </summary>
+            RemoveUnusedNamespaces,
         }
     }
 }
diff --git a/src/test/WixToolsetTest.Converters/BootstrapperApplicationFixture.cs b/src/test/WixToolsetTest.Converters/BootstrapperApplicationFixture.cs
index 60386470..158ab3be 100644
--- a/src/test/WixToolsetTest.Converters/BootstrapperApplicationFixture.cs
+++ b/src/test/WixToolsetTest.Converters/BootstrapperApplicationFixture.cs
@@ -396,7 +396,7 @@ namespace WixToolsetTest.Converters
 
             var expected = new[]
             {
-                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\" xmlns:bal=\"http://wixtoolset.org/schemas/v4/wxs/bal\">",
+                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\">",
                 "  <Fragment>",
                 "    <BootstrapperApplication Id=\"ba\" />",
                 "  </Fragment>",
@@ -409,7 +409,7 @@ namespace WixToolsetTest.Converters
             var converter = new WixConverter(messaging, 2, null, null);
 
             var errors = converter.ConvertDocument(document);
-            Assert.Equal(4, errors);
+            Assert.Equal(5, errors);
 
             var actualLines = UnformattedDocumentLines(document);
             WixAssert.CompareLineByLine(expected, actualLines);
diff --git a/src/test/WixToolsetTest.Converters/ConverterFixture.cs b/src/test/WixToolsetTest.Converters/ConverterFixture.cs
index 20f42068..207d5c8f 100644
--- a/src/test/WixToolsetTest.Converters/ConverterFixture.cs
+++ b/src/test/WixToolsetTest.Converters/ConverterFixture.cs
@@ -166,7 +166,7 @@ namespace WixToolsetTest.Converters
                 "</Wix>");
 
             var expected = String.Join(Environment.NewLine,
-                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\" xmlns:util=\"http://wixtoolset.org/schemas/v4/wxs/util\">",
+                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\">",
                 "  <Fragment />",
                 "</Wix>");
 
@@ -179,7 +179,7 @@ namespace WixToolsetTest.Converters
 
             var actual = UnformattedDocumentString(document);
 
-            Assert.Equal(3, errors);
+            Assert.Equal(4, errors);
             Assert.Equal(expected, actual);
             Assert.Equal(Wix4Namespace, document.Root.GetDefaultNamespace());
         }
diff --git a/src/test/WixToolsetTest.Converters/DependencyFixture.cs b/src/test/WixToolsetTest.Converters/DependencyFixture.cs
new file mode 100644
index 00000000..41ded927
--- /dev/null
+++ b/src/test/WixToolsetTest.Converters/DependencyFixture.cs
@@ -0,0 +1,178 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolsetTest.Converters
+{
+    using System;
+    using System.Xml.Linq;
+    using WixBuildTools.TestSupport;
+    using WixToolset.Converters;
+    using WixToolsetTest.Converters.Mocks;
+    using Xunit;
+
+    public class DependencyFixture : BaseConverterFixture
+    {
+        [Fact]
+        public void FixPackageDependencyProvides()
+        {
+            var parse = String.Join(Environment.NewLine,
+                "<?xml version=\"1.0\" encoding=\"utf-16\"?>",
+                "<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi' xmlns:dep='http://schemas.microsoft.com/wix/DependencyExtension'>",
+                "  <Fragment>",
+                "    <ComponentGroup Id='Group1' Directory='INSTALLFOLDER'>",
+                "      <Component>",
+                "        <dep:Provides Key='abc' />",
+                "      </Component>",
+                "    </ComponentGroup>",
+                "  </Fragment>",
+                "</Wix>");
+
+            var expected = new[]
+            {
+                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\" xmlns:dep=\"http://wixtoolset.org/schemas/v4/wxs/dependency\">",
+                "  <Fragment>",
+                "    <ComponentGroup Id=\"Group1\" Directory=\"INSTALLFOLDER\">",
+                "      <Component>",
+                "        <Provides Key=\"abc\" dep:Check=\"yes\" />",
+                "      </Component>",
+                "    </ComponentGroup>",
+                "  </Fragment>",
+                "</Wix>"
+            };
+
+            var document = XDocument.Parse(parse, LoadOptions.PreserveWhitespace | LoadOptions.SetLineInfo);
+
+            var messaging = new MockMessaging();
+            var converter = new WixConverter(messaging, 2, null, null);
+
+            var errors = converter.ConvertDocument(document);
+            Assert.Equal(5, errors);
+
+            var actualLines = UnformattedDocumentLines(document);
+            WixAssert.CompareLineByLine(expected, actualLines);
+        }
+
+        [Fact]
+        public void FixPackageDependencyRequires()
+        {
+            var parse = String.Join(Environment.NewLine,
+                "<?xml version=\"1.0\" encoding=\"utf-16\"?>",
+                "<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi' xmlns:dep='http://schemas.microsoft.com/wix/DependencyExtension'>",
+                "  <Fragment>",
+                "    <ComponentGroup Id='Group1' Directory='INSTALLFOLDER'>",
+                "      <Component>",
+                "        <dep:Provides Key='abc'>",
+                "          <dep:Requires Key='xyz' />",
+                "        </dep:Provides>",
+                "      </Component>",
+                "    </ComponentGroup>",
+                "  </Fragment>",
+                "</Wix>");
+
+            var expected = new[]
+            {
+                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\" xmlns:dep=\"http://wixtoolset.org/schemas/v4/wxs/dependency\">",
+                "  <Fragment>",
+                "    <ComponentGroup Id=\"Group1\" Directory=\"INSTALLFOLDER\">",
+                "      <Component>",
+                "        <Provides Key=\"abc\" dep:Check=\"yes\">",
+                "          <Requires Key=\"xyz\" dep:Enforce=\"yes\" />",
+                "        </Provides>",
+                "      </Component>",
+                "    </ComponentGroup>",
+                "  </Fragment>",
+                "</Wix>"
+            };
+
+            var document = XDocument.Parse(parse, LoadOptions.PreserveWhitespace | LoadOptions.SetLineInfo);
+
+            var messaging = new MockMessaging();
+            var converter = new WixConverter(messaging, 2, null, null);
+
+            var errors = converter.ConvertDocument(document);
+            Assert.Equal(7, errors);
+
+            var actualLines = UnformattedDocumentLines(document);
+            WixAssert.CompareLineByLine(expected, actualLines);
+        }
+
+        [Fact]
+        public void FixPackageDependencyRequiresRef()
+        {
+            var parse = String.Join(Environment.NewLine,
+                "<?xml version=\"1.0\" encoding=\"utf-16\"?>",
+                "<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi' xmlns:dep='http://schemas.microsoft.com/wix/DependencyExtension'>",
+                "  <Fragment>",
+                "    <ComponentGroup Id='Group1' Directory='INSTALLFOLDER'>",
+                "      <Component>",
+                "        <dep:Provides Key='abc'>",
+                "          <dep:RequiresRef Id='OtherRequires' />",
+                "        </dep:Provides>",
+                "      </Component>",
+                "    </ComponentGroup>",
+                "  </Fragment>",
+                "</Wix>");
+
+            var expected = new[]
+            {
+                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\" xmlns:dep=\"http://wixtoolset.org/schemas/v4/wxs/dependency\">",
+                "  <Fragment>",
+                "    <ComponentGroup Id=\"Group1\" Directory=\"INSTALLFOLDER\">",
+                "      <Component>",
+                "        <Provides Key=\"abc\" dep:Check=\"yes\">",
+                "          <RequiresRef Id=\"OtherRequires\" dep:Enforce=\"yes\" />",
+                "        </Provides>",
+                "      </Component>",
+                "    </ComponentGroup>",
+                "  </Fragment>",
+                "</Wix>"
+            };
+
+            var document = XDocument.Parse(parse, LoadOptions.PreserveWhitespace | LoadOptions.SetLineInfo);
+
+            var messaging = new MockMessaging();
+            var converter = new WixConverter(messaging, 2, null, null);
+
+            var errors = converter.ConvertDocument(document);
+            Assert.Equal(7, errors);
+
+            var actualLines = UnformattedDocumentLines(document);
+            WixAssert.CompareLineByLine(expected, actualLines);
+        }
+
+        [Fact]
+        public void FixBundleDependencyProvides()
+        {
+            var parse = String.Join(Environment.NewLine,
+                "<?xml version=\"1.0\" encoding=\"utf-16\"?>",
+                "<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi' xmlns:dep='http://schemas.microsoft.com/wix/DependencyExtension'>",
+                "  <Fragment>",
+                "    <MsiPackage Id='Package1'>",
+                "      <dep:Provides Key='abc' />",
+                "    </MsiPackage>",
+                "  </Fragment>",
+                "</Wix>");
+
+            var expected = new[]
+            {
+                "<Wix xmlns=\"http://wixtoolset.org/schemas/v4/wxs\">",
+                "  <Fragment>",
+                "    <MsiPackage Id=\"Package1\">",
+                "      <Provides Key=\"abc\" />",
+                "    </MsiPackage>",
+                "  </Fragment>",
+                "</Wix>"
+            };
+
+            var document = XDocument.Parse(parse, LoadOptions.PreserveWhitespace | LoadOptions.SetLineInfo);
+
+            var messaging = new MockMessaging();
+            var converter = new WixConverter(messaging, 2, null, null);
+
+            var errors = converter.ConvertDocument(document);
+            Assert.Equal(5, errors);
+
+            var actualLines = UnformattedDocumentLines(document);
+            WixAssert.CompareLineByLine(expected, actualLines);
+        }
+    }
+}