Initialize xsl plugin (see #91)

extensions/org.eclipse.lsp4xml.xsl/.gitignore

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+build/
+.out/
+bin/
+.bin/
+target/
+
+/gradle.properties
+/archive/
+/META-INF
+
+.classpath
+.project
+.settings
+
+.idea/
+*.iml
+*.iws
+*.ipr
+.idea_modules/
+**/out/
+
+*.tmp
+*.bak
+*.swp
+*~
+
+.gradle
+
+.DS_Store*
+.AppleDouble
+.LSOverride
+
+.directory
+.Trash*
+
+**/adhoctest/

extensions/org.eclipse.lsp4xml.xsl/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.eclipse</groupId>
+		<artifactId>lsp4xml-extensions</artifactId>
+		<version>0.0.1-SNAPSHOT</version>
+	</parent>
+	<artifactId>org.eclipse.lsp4xml.xsl</artifactId>
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+	<build>
+		<plugins>
+			<plugin>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.7.0</version>
+				<configuration>
+					<source>1.8</source>
+					<target>1.8</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+	<dependencies>
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
+			<version>2.7</version>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.lsp4j</groupId>
+			<artifactId>org.eclipse.lsp4j</artifactId>
+			<version>${lsp4j.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.lsp4j</groupId>
+			<artifactId>org.eclipse.lsp4j.jsonrpc</artifactId>
+			<version>${lsp4j.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.xtext</groupId>
+			<artifactId>org.eclipse.xtext.xbase.lib</artifactId>
+			<version>2.14.0</version>
+		</dependency>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.12</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse</groupId>
+			<artifactId>org.eclipse.lsp4xml</artifactId>
+			<version>0.0.1-SNAPSHOT</version>
+		</dependency>		
+	</dependencies>
+</project>

extensions/org.eclipse.lsp4xml.xsl/src/main/java/META-INF/services/org.eclipse.lsp4xml.services.extensions.IXMLExtension

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+org.eclipse.lsp4xml.xsl.XSLPlugin

extensions/org.eclipse.lsp4xml.xsl/src/main/java/org/eclipse/lsp4xml/xsl/XSLPlugin.java

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+package org.eclipse.lsp4xml.xsl;
+
+import org.eclipse.lsp4xml.services.extensions.IXMLExtension;
+import org.eclipse.lsp4xml.services.extensions.XMLExtensionsRegistry;
+import org.eclipse.lsp4xml.uriresolver.URIResolverExtensionManager;
+
+public class XSLPlugin implements IXMLExtension {
+
+	private final XSLURIResolverExtension uiResolver;
+
+	public XSLPlugin() {
+		uiResolver = new XSLURIResolverExtension();
+	}
+
+	@Override
+	public void updateSettings(Object settings) {
+
+	}
+
+	@Override
+	public void start(XMLExtensionsRegistry registry) {
+		URIResolverExtensionManager.getInstance().registerResolver(uiResolver);
+	}
+
+	@Override
+	public void stop(XMLExtensionsRegistry registry) {
+		URIResolverExtensionManager.getInstance().unregisterResolver(uiResolver);
+	}
+}

extensions/org.eclipse.lsp4xml.xsl/src/main/java/org/eclipse/lsp4xml/xsl/XSLURIResolverExtension.java

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+package org.eclipse.lsp4xml.xsl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Writer;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.eclipse.lsp4xml.uriresolver.URIResolverExtension;
+
+public class XSLURIResolverExtension implements URIResolverExtension {
+
+	/**
+	 * The XSL namespace URI (= http://www.w3.org/1999/XSL/Transform)
+	 */
+	private static final String XSL_NAMESPACE_URI = "http://www.w3.org/1999/XSL/Transform"; //$NON-NLS-1$
+
+	@Override
+	public String resolve(String baseLocation, String publicId, String systemId) {
+		if (!XSL_NAMESPACE_URI.equals(publicId)) {
+			return null;
+		}
+		else {
+
+		}
+		// TODO: extract version from XML Document
+		String version = "1.0";
+		String schemaFileName = "xslt-" + version + ".xsd";
+		String schemaPath = "/xslt-schemas/" + schemaFileName;
+
+		try {
+			Path baseDir = Paths.get("C://lsp4xml");
+			Files.createDirectories(baseDir);
+			Path outFile = baseDir.resolve(schemaFileName);
+			if (!outFile.toFile().exists()) {
+				InputStream in = XSLURIResolverExtension.class.getResourceAsStream(schemaPath);
+				String xml = convertStreamToString(in);
+				saveToFile(xml, outFile);
+			}
+			return outFile.toFile().toURI().toString();
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+
+	private static void saveToFile(String xml, Path outFile) throws IOException {
+		try (Writer writer = Files.newBufferedWriter(outFile, StandardCharsets.UTF_8)) {
+			writer.write(xml);
+		}
+	}
+
+	static String convertStreamToString(java.io.InputStream is) {
+		java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
+		return s.hasNext() ? s.next() : "";
+	}
+
+}