Completion for xmlns:xsi and xmlns

Fixes eclipse-lemminx#326, eclipse-lemminx#208

Signed-off-by: Nikolas <nikolaskomonen@gmail.com>

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/participants/ContentModelCompletionParticipant.java

@@ -115,7 +115,7 @@ private void fillWithChildrenElementDeclaration(DOMElement element, Collection<C
 
 	@Override
 	public void onAttributeName(boolean generateValue, Range fullRange, ICompletionRequest request,
-			ICompletionResponse response) throws Exception {
+			ICompletionResponse response, SharedSettings settings) throws Exception {
 		// otherwise, manage completion based on XML Schema, DTD.
 		DOMElement parentElement = request.getNode().isElement() ? (DOMElement) request.getNode() : null;
 		if (parentElement == null) {
@@ -127,19 +127,19 @@ public void onAttributeName(boolean generateValue, Range fullRange, ICompletionR
 			// Completion on attribute based on external grammar
 			CMElementDeclaration cmElement = contentModelManager.findCMElement(parentElement);
 			fillAttributesWithCMAttributeDeclarations(parentElement, fullRange, cmElement, canSupportSnippet,
-					generateValue, response);
+					generateValue, response, settings);
 			// Completion on attribute based on internal grammar
 			cmElement = contentModelManager.findInternalCMElement(parentElement);
 			fillAttributesWithCMAttributeDeclarations(parentElement, fullRange, cmElement, canSupportSnippet,
-					generateValue, response);
+					generateValue, response, settings);
 		} catch (CacheResourceDownloadingException e) {
 			// XML Schema, DTD is loading, ignore this error
 		}
 	}
 
 	private void fillAttributesWithCMAttributeDeclarations(DOMElement parentElement, Range fullRange,
 			CMElementDeclaration cmElement, boolean canSupportSnippet, boolean generateValue,
-			ICompletionResponse response) {
+			ICompletionResponse response, SharedSettings settings) {
 		if (cmElement == null) {
 			return;
 		}
@@ -151,7 +151,7 @@ private void fillAttributesWithCMAttributeDeclarations(DOMElement parentElement,
 			String attrName = cmAttribute.getName();
 			if (!parentElement.hasAttribute(attrName)) {
 				CompletionItem item = new AttributeCompletionItem(attrName, canSupportSnippet, fullRange, generateValue,
-						cmAttribute.getDefaultValue(), cmAttribute.getEnumerationValues());
+						cmAttribute.getDefaultValue(), cmAttribute.getEnumerationValues(), settings);
 				String documentation = cmAttribute.getDocumentation();
 				if (documentation != null) {
 					item.setDetail(documentation);

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/utils/XMLGenerator.java

@@ -17,6 +17,7 @@
 import org.eclipse.lsp4xml.commons.SnippetsBuilder;
 import org.eclipse.lsp4xml.extensions.contentmodel.model.CMAttributeDeclaration;
 import org.eclipse.lsp4xml.extensions.contentmodel.model.CMElementDeclaration;
+import org.eclipse.lsp4xml.settings.SharedSettings;
 import org.eclipse.lsp4xml.settings.XMLFormattingOptions;
 import org.eclipse.lsp4xml.utils.XMLBuilder;
 
@@ -170,9 +171,23 @@ private int generate(Collection<CMAttributeDeclaration> attributes, int level, i
 	 */
 	public static String generateAttributeValue(String defaultValue, Collection<String> enumerationValues,
 			boolean canSupportSnippets, int snippetIndex, boolean withQuote) {
+		return generateAttributeValue(defaultValue, enumerationValues, canSupportSnippets, snippetIndex, withQuote, null);
+	}
+
+	/**
+	 * Creates the string value for a CompletionItem TextEdit
+	 * 
+	 * Can create an enumerated TextEdit if given a collection of values.
+	 */
+	public static String generateAttributeValue(String defaultValue, Collection<String> enumerationValues,
+			boolean canSupportSnippets, int snippetIndex, boolean withQuote, SharedSettings settings) {
 		StringBuilder value = new StringBuilder();
+		String quotation = "\"";
 		if (withQuote) {
-			value.append("=\"");
+			if(settings != null) {
+				quotation = settings.formattingSettings.getQuotationAsString();
+			} 
+			value.append("=" + quotation);
 		}
 		if (!canSupportSnippets) {
 			if (defaultValue != null) {
@@ -191,7 +206,7 @@ public static String generateAttributeValue(String defaultValue, Collection<Stri
 			}
 		}
 		if (withQuote) {
-			value.append("\"");
+			value.append(quotation);
 			if (canSupportSnippets) {
 				SnippetsBuilder.tabstops(0, value); // "$0"
 			}

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/xsd/participants/XSDCompletionParticipant.java

@@ -14,6 +14,7 @@
 import org.eclipse.lsp4xml.services.extensions.CompletionParticipantAdapter;
 import org.eclipse.lsp4xml.services.extensions.ICompletionRequest;
 import org.eclipse.lsp4xml.services.extensions.ICompletionResponse;
+import org.eclipse.lsp4xml.settings.SharedSettings;
 
 /**
  * XSD completion for xs:
@@ -23,7 +24,7 @@ public class XSDCompletionParticipant extends CompletionParticipantAdapter {
 
 	@Override
 	public void onAttributeName(boolean generateValue, Range fullRange, ICompletionRequest request,
-			ICompletionResponse response) throws Exception {
+			ICompletionResponse response, SharedSettings settings) throws Exception {
 		// TODO: manage compeltion for types declared in XML Schema xsd
 	}
 }

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/xsi/XSICompletionParticipant.java

@@ -25,11 +25,11 @@ public class XSICompletionParticipant extends CompletionParticipantAdapter {
 
 	@Override
 	public void onAttributeName(boolean generateValue, Range fullRange, ICompletionRequest request,
-			ICompletionResponse response) throws Exception {
-		if (request.getXMLDocument().hasSchemaInstancePrefix()) {
+			ICompletionResponse response, SharedSettings settings) throws Exception {
+		//if (request.getXMLDocument().hasSchemaInstancePrefix()) {
 			XSISchemaModel.computeCompletionResponses(request, response, fullRange, request.getXMLDocument(),
-					generateValue);
-		}
+					generateValue, settings);
+
 	}
 
 	@Override

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/AttributeCompletionItem.java

@@ -18,6 +18,7 @@
 import org.eclipse.lsp4j.Range;
 import org.eclipse.lsp4j.TextEdit;
 import org.eclipse.lsp4xml.extensions.contentmodel.utils.XMLGenerator;
+import org.eclipse.lsp4xml.settings.SharedSettings;
 
 public class AttributeCompletionItem extends CompletionItem {
 
@@ -34,15 +35,15 @@ public class AttributeCompletionItem extends CompletionItem {
 	 * @param enumerationValues  the enumeration values of attribute.
 	 */
 	public AttributeCompletionItem(String attrName, boolean canSupportSnippets, Range fullRange, boolean generateValue,
-			String defaultValue, Collection<String> enumerationValues) {
+			String defaultValue, Collection<String> enumerationValues, SharedSettings settings) {
 		super.setLabel(attrName);
 		super.setKind(CompletionItemKind.Unit);
 		super.setFilterText(attrName);
 		StringBuilder attributeContent = new StringBuilder(attrName);
 		if (generateValue) {
 			// Generate attribute value content
 			String attributeValue = XMLGenerator.generateAttributeValue(defaultValue, enumerationValues,
-					canSupportSnippets, 1, true);
+					canSupportSnippets, 1, true, settings);
 			attributeContent.append(attributeValue);
 		}
 		super.setTextEdit(new TextEdit(fullRange, attributeContent.toString()));

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/XMLCompletions.java

@@ -107,7 +107,7 @@ public CompletionList doComplete(DOMDocument xmlDocument, Position position,
 			case AttributeName:
 				if (scanner.getTokenOffset() <= offset && offset <= scanner.getTokenEnd()) {
 					collectAttributeNameSuggestions(scanner.getTokenOffset(), scanner.getTokenEnd(), completionRequest,
-							completionResponse);
+							completionResponse, settings);
 					return completionResponse;
 				}
 				completionRequest.setCurrentAttributeName(scanner.getTokenText());
@@ -136,7 +136,7 @@ public CompletionList doComplete(DOMDocument xmlDocument, Position position,
 						return completionResponse;
 					case WithinTag:
 					case AfterAttributeName:
-						collectAttributeNameSuggestions(scanner.getTokenEnd(), completionRequest, completionResponse);
+						collectAttributeNameSuggestions(scanner.getTokenEnd(), completionRequest, completionResponse, settings);
 						return completionResponse;
 					case BeforeAttributeValue:
 						collectAttributeValueSuggestions(scanner.getTokenEnd(), offset, completionRequest,
@@ -694,13 +694,13 @@ private void collectCharacterEntityProposals(ICompletionRequest request, IComple
 	}
 
 	private void collectAttributeNameSuggestions(int nameStart, CompletionRequest completionRequest,
-			CompletionResponse completionResponse) {
+			CompletionResponse completionResponse, SharedSettings settings) {
 		collectAttributeNameSuggestions(nameStart, completionRequest.getOffset(), completionRequest,
-				completionResponse);
+				completionResponse, settings);
 	}
 
 	private void collectAttributeNameSuggestions(int nameStart, int nameEnd, CompletionRequest completionRequest,
-			CompletionResponse completionResponse) {
+			CompletionResponse completionResponse, SharedSettings settings) {
 		int replaceEnd = completionRequest.getOffset();
 		String text = completionRequest.getXMLDocument().getText();
 		while (replaceEnd < nameEnd && text.charAt(replaceEnd) != '<') { // < is a valid attribute name character, but
@@ -713,7 +713,7 @@ private void collectAttributeNameSuggestions(int nameStart, int nameEnd, Complet
 			boolean generateValue = !isFollowedBy(text, nameEnd, ScannerState.AfterAttributeName,
 					TokenType.DelimiterAssign);
 			for (ICompletionParticipant participant : getCompletionParticipants()) {
-				participant.onAttributeName(generateValue, range, completionRequest, completionResponse);
+				participant.onAttributeName(generateValue, range, completionRequest, completionResponse, settings);
 			}
 		} catch (BadLocationException e) {
 			LOGGER.log(Level.SEVERE, "While performing Completions, getReplaceRange() was given a bad Offset location",

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/XSISchemaModel.java

@@ -16,18 +16,14 @@
 import org.eclipse.lsp4j.CompletionItem;
 import org.eclipse.lsp4j.CompletionItemKind;
 import org.eclipse.lsp4j.Hover;
-import org.eclipse.lsp4j.InsertTextFormat;
 import org.eclipse.lsp4j.MarkupContent;
 import org.eclipse.lsp4j.MarkupKind;
-import org.eclipse.lsp4j.Position;
 import org.eclipse.lsp4j.Range;
 import org.eclipse.lsp4j.TextEdit;
 import org.eclipse.lsp4xml.commons.BadLocationException;
 import org.eclipse.lsp4xml.dom.DOMAttr;
 import org.eclipse.lsp4xml.dom.DOMDocument;
 import org.eclipse.lsp4xml.dom.DOMElement;
-import org.eclipse.lsp4xml.dom.DOMNode;
-import org.eclipse.lsp4xml.extensions.contentmodel.utils.XMLGenerator;
 import org.eclipse.lsp4xml.services.extensions.ICompletionRequest;
 import org.eclipse.lsp4xml.services.extensions.ICompletionResponse;
 import org.eclipse.lsp4xml.services.extensions.IHoverRequest;
@@ -64,8 +60,10 @@ public class XSISchemaModel {
 				"  <!-- ... -->  " + lineSeparator +
 				"</root>  " + lineSeparator +
 				"```" ;
+	public static final String XSI_WEBSITE = "http://www.w3.org/2001/XMLSchema-instance";
+	public static final String XSI_DOC = "The namespace that defines important attributes such as `noNamespaceSchemaLocation` and `schemaLocation`.";
 	public static void computeCompletionResponses(ICompletionRequest request, 
-			ICompletionResponse response, Range editRange, DOMDocument document, boolean generateValue) throws BadLocationException {
+			ICompletionResponse response, Range editRange, DOMDocument document, boolean generateValue, SharedSettings settings) throws BadLocationException {
 
 		DOMElement rootElement = document.getDocumentElement();
 		int offset = document.offsetAt(editRange.getStart());
@@ -74,8 +72,20 @@ public static void computeCompletionResponses(ICompletionRequest request,
 		if(rootElement.equals(nodeAtOffset)) {
 			inRootElement = true;
 		}
-		
+
 		boolean isSnippetsSupported = request.getCompletionSettings().isCompletionSnippetsSupported();
+		if(inRootElement) {
+			if(!hasAttribute(nodeAtOffset, "xmlns") && !response.hasAttribute("xmlns")) {
+				createCompletionItem("xmlns", isSnippetsSupported, generateValue, editRange, null, null, null, response, settings);
+			}
+			if(document.hasSchemaInstancePrefix() == false) {
+				createCompletionItem("xmlns:xsi", isSnippetsSupported, generateValue, editRange, XSI_WEBSITE, null, XSI_DOC, response, settings);
+				return;// All the following completion cases dont exist, so return.
+			}
+
+
+		}
+
 		String actualPrefix = document.getSchemaInstancePrefix();
 		String name;
 		String documentation;
@@ -87,7 +97,7 @@ public static void computeCompletionResponses(ICompletionRequest request,
 			documentation = NIL_DOC;
 			name = actualPrefix + ":nil";
 			createCompletionItem(name, isSnippetsSupported, generateValue, editRange, StringUtils.TRUE, 
-				StringUtils.TRUE_FALSE_ARRAY, documentation, response);
+				StringUtils.TRUE_FALSE_ARRAY, documentation, response, settings);
 		}
 		//Signals that an element should be accepted as ·valid· when it has no content despite 
 		//a content type which does not require or even necessarily allow empty content. 
@@ -96,26 +106,29 @@ public static void computeCompletionResponses(ICompletionRequest request,
 		if(!hasAttribute(nodeAtOffset, actualPrefix, "type")) {
 			documentation = TYPE_DOC;
 			name = actualPrefix + ":type";
-			createCompletionItem(name, isSnippetsSupported, generateValue, editRange, null, null, documentation, response);	
+			createCompletionItem(name, isSnippetsSupported, generateValue, editRange, null, null, documentation, response, settings);	
 		}
-		//The xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes can be used in a document 
-		//to provide hints as to the physical location of schema documents which may be used for ·assessment·.
-		if(inRootElement && !schemaLocationExists && !noNamespaceSchemaLocationExists) {
-			documentation = SCHEMA_LOCATION_DOC;
-			name = actualPrefix + ":schemaLocation";
-			createCompletionItem(name, isSnippetsSupported, generateValue, editRange, null, null, documentation, response);	
-
-			documentation = NO_NAMESPACE_SCHEMA_LOCATION_DOC;
-			name = actualPrefix + ":noNamespaceSchemaLocation";
-			createCompletionItem(name, isSnippetsSupported, generateValue, editRange, null, null, documentation, response);		
+
+		if(inRootElement) {
+			if(!schemaLocationExists && !noNamespaceSchemaLocationExists) {
+				//The xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes can be used in a document 
+				//to provide hints as to the physical location of schema documents which may be used for ·assessment·.
+				documentation = SCHEMA_LOCATION_DOC;
+				name = actualPrefix + ":schemaLocation";
+				createCompletionItem(name, isSnippetsSupported, generateValue, editRange, null, null, documentation, response, settings);	
+
+				documentation = NO_NAMESPACE_SCHEMA_LOCATION_DOC;
+				name = actualPrefix + ":noNamespaceSchemaLocation";
+				createCompletionItem(name, isSnippetsSupported, generateValue, editRange, null, null, documentation, response, settings);	
+			}	
 		}
 	}
 
 	private static void createCompletionItem(String attrName, boolean canSupportSnippet, boolean generateValue,
 			Range editRange, String defaultValue, Collection<String> enumerationValues, String documentation,
-			ICompletionResponse response) {
+			ICompletionResponse response, SharedSettings settings){
 		CompletionItem item = new AttributeCompletionItem(attrName, canSupportSnippet, editRange, generateValue,
-				defaultValue, enumerationValues);
+				defaultValue, enumerationValues, settings);
 		MarkupContent markup = new MarkupContent();
 		markup.setKind(MarkupKind.MARKDOWN);
 		markup.setValue(documentation);
@@ -129,12 +142,21 @@ public static void computeValueCompletionResponses(ICompletionRequest request,
 		int offset = document.offsetAt(editRange.getStart());
 		DOMElement nodeAtOffset = (DOMElement) document.findNodeAt(offset);
 
+
 		String actualPrefix = document.getSchemaInstancePrefix();
+		DOMAttr attrAtOffset = nodeAtOffset.findAttrAt(offset);
+		String attrName = attrAtOffset.getName();
 
-		// Value completion for 'nil' attribute
-		DOMAttr nilAttr = nodeAtOffset.getAttributeNode(actualPrefix, "nil");
-		if(nilAttr != null) {
-			createCompletionItemsForValues(StringUtils.TRUE_FALSE_ARRAY, editRange, document, response, settings);
+		if(attrName != null) {
+			if(attrName.equals(actualPrefix + ":nil")) { // Value completion for 'nil' attribute
+				createCompletionItemsForValues(StringUtils.TRUE_FALSE_ARRAY, editRange, document, response, settings);
+			}
+			else if(document.getDocumentElement().equals(nodeAtOffset)) { // if in the root element
+				if(attrName.equals("xmlns:xsi")) {
+					createSingleCompletionItemForValue(XSI_WEBSITE, editRange, document, response, settings);
+				}
+			}
+
 		}
 	}
 
@@ -178,6 +200,10 @@ private static boolean hasAttribute(DOMElement root, String prefix, String suffi
 
 	}
 
+	private static boolean hasAttribute(DOMElement root, String name) {
+		return hasAttribute(root, null, name);
+	}
+
 	public static Hover computeHoverResponse(DOMAttr attribute, IHoverRequest request) {
 
 		String name = attribute.getName();

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/extensions/CompletionParticipantAdapter.java

@@ -32,7 +32,7 @@ public void onXMLContent(ICompletionRequest request, ICompletionResponse respons
 
 	@Override
 	public void onAttributeName(boolean generateValue, Range fullRange, ICompletionRequest request,
-			ICompletionResponse response) throws Exception {
+			ICompletionResponse response, SharedSettings settings) throws Exception {
 		// Do nothing
 	}
 

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/extensions/ICompletionParticipant.java

@@ -24,8 +24,8 @@ public interface ICompletionParticipant {
 
 	void onXMLContent(ICompletionRequest request, ICompletionResponse response) throws Exception;
 
-	void onAttributeName(boolean generateValue, Range fullRange, ICompletionRequest request, ICompletionResponse response)
-			throws Exception;
+	void onAttributeName(boolean generateValue, Range fullRange, ICompletionRequest request, ICompletionResponse response,
+			SharedSettings settings) throws Exception;
 
 	void onAttributeValue(String valuePrefix, Range fullRange, boolean addQuotes, ICompletionRequest request,
 			ICompletionResponse response, SharedSettings settings) throws Exception;

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/settings/XMLFormattingOptions.java

@@ -203,7 +203,9 @@ public String getQuotations() {
 	/**
 	 * Returns the actual quotation value as a String.
 	 * 
-	 * Either a {@code '} or {@code "}
+	 * Either a {@code '} or {@code "}.
+	 * 
+	 * Defaults to {@code "}.
 	 */
 	public String getQuotationAsString() {
 		return XMLFormattingOptions.DOUBLE_QUOTES_VALUE.equals(getQuotations()) ? "\"" : "\'";

org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/XMLAssert.java

@@ -117,10 +117,17 @@ public static void testCompletionFor(XMLLanguageService xmlLanguageService, Stri
 	public static void testCompletionFor(XMLLanguageService xmlLanguageService, String value, String catalogPath,
 			Consumer<XMLLanguageService> customConfiguration, String fileURI, Integer expectedCount,
 			CompletionSettings completionSettings, CompletionItem... expectedItems) throws BadLocationException {
+		testCompletionFor(xmlLanguageService, value, catalogPath, customConfiguration, fileURI, expectedCount, completionSettings, new XMLFormattingOptions(4, true), expectedItems);
+	}
+
+	public static void testCompletionFor(XMLLanguageService xmlLanguageService, String value, String catalogPath,
+			Consumer<XMLLanguageService> customConfiguration, String fileURI, Integer expectedCount,
+			CompletionSettings completionSettings, XMLFormattingOptions formattingSettings, CompletionItem... expectedItems)
+			throws BadLocationException {
 		int offset = value.indexOf('|');
 		value = value.substring(0, offset) + value.substring(offset + 1);
 
-		TextDocument document = new TextDocument(value, fileURI != null ? fileURI : "test://test/test.html");
+		TextDocument document = new TextDocument(value, fileURI != null ? fileURI : "test://test/test.xml");
 		Position position = document.positionAt(offset);
 		DOMDocument htmlDoc = DOMParser.getInstance().parse(document, xmlLanguageService.getResolverExtensionManager());
 		xmlLanguageService.setDocumentProvider((uri) -> htmlDoc);
@@ -139,7 +146,7 @@ public static void testCompletionFor(XMLLanguageService xmlLanguageService, Stri
 		}
 
 		SharedSettings sharedSettings = new SharedSettings();
-		sharedSettings.setFormattingSettings(new XMLFormattingOptions(4, false));
+		sharedSettings.setFormattingSettings(formattingSettings);
 		sharedSettings.setCompletionSettings(completionSettings);
 
 		CompletionList list = xmlLanguageService.doComplete(htmlDoc, position, sharedSettings);