[lsapi] added default coloring, throw exception when no languages are registered.

plugins/org.eclipse.xtext.ide/META-INF/MANIFEST.MF

@@ -32,4 +32,5 @@ Export-Package: org.eclipse.xtext.ide;x-friends:="org.eclipse.xtend.ide",
  org.eclipse.xtext.ide.server.concurrent,
  org.eclipse.xtext.ide.server.contentassist,
  org.eclipse.xtext.ide.server.findReferences,
- org.eclipse.xtext.ide.server.symbol
+ org.eclipse.xtext.ide.server.symbol,
+ org.eclipse.xtext.ide.util

plugins/org.eclipse.xtext.ide/src/org/eclipse/xtext/ide/editor/syntaxcoloring/IEditorHighlightingConfigurationProvider.xtend

@@ -7,10 +7,67 @@
  *******************************************************************************/
 package org.eclipse.xtext.ide.editor.syntaxcoloring
 
+import com.google.inject.ImplementedBy
+import com.google.inject.Inject
+import org.eclipse.xtext.GrammarUtil
+import org.eclipse.xtext.IGrammarAccess
+import org.eclipse.xtext.LanguageInfo
+
 /**
  * @author Sven Efftinge - Initial contribution and API
  */
+@ImplementedBy(DefaultImpl)
 interface IEditorHighlightingConfigurationProvider {
-    
+
+    /**
+     * provides an editor specific highlighting configuration or null.
+     */
     def String getConfiguration(String editorName)
-}
+
+    static class DefaultImpl implements IEditorHighlightingConfigurationProvider {
+
+        @Inject IGrammarAccess grammarAccess
+        @Inject LanguageInfo languageInfo
+
+        override getConfiguration(String editorName) {
+            if (editorName == 'EclipseChe' || editorName == 'EclipseOrion') {
+                return '''
+                    [
+                      «getStandardPatterns»
+                      {
+                        match: "\\\\b(?:«keywords.join('|')»)\\\\b", 
+                        name: "keyword.«languageInfo.shortName»" 
+                      }
+                    ]
+                '''
+            } else {
+                return '''
+                '''
+            }
+        }
+
+        def getGetStandardPatterns() '''
+            {include: "orion.c-like#comment_singleLine"},
+            {include: "orion.c-like#comment_block"},
+            {include: "orion.lib#string_doubleQuote"},
+            {include: "orion.lib#string_singleQuote"},
+            {include: "orion.lib#number_decimal"},
+            {include: "orion.lib#number_hex"},
+            {include: "orion.lib#brace_open"},
+            {include: "orion.lib#brace_close"},
+            {include: "orion.lib#bracket_open"},
+            {include: "orion.lib#bracket_close"},
+            {include: "orion.lib#parenthesis_open"},
+            {include: "orion.lib#parenthesis_close"},
+            {include: "orion.lib#operator"},
+            {include: "orion.lib#doc_block"},
+        '''
+
+        def Iterable<String> getKeywords() {
+            GrammarUtil.containedKeywords(grammarAccess.grammar).filter [
+                Character.isJavaIdentifierStart(it.value.charAt(0))
+            ].map[value].toSet.sort
+        }
+
+    }
+}

plugins/org.eclipse.xtext.ide/src/org/eclipse/xtext/ide/server/LanguageServerImpl.xtend

@@ -94,6 +94,9 @@ import static io.typefox.lsapi.util.LsapiFactories.*
 		if (params.rootPath === null) {
 			throw new IllegalArgumentException("Bad initialization request. rootPath must not be null.")
 		}
+		if (languagesRegistry.extensionToFactoryMap.isEmpty) {
+			throw new IllegalStateException("No Xtext languages have been registered. Please make sure you have added the languages's setup class in '/META-INF/services/org.eclipse.xtext.ISetup'")
+		}
 		this.params = params
 		workspaceManager = workspaceManagerProvider.get
 		resourceAccess = new WorkspaceResourceAccess(workspaceManager)