Make the JSON server's computation limit configurable

org.eclipse.wildwebdeveloper.tests/src/org/eclipse/wildwebdeveloper/tests/TestJSONResultLimitPreference.java

@@ -0,0 +1,113 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Vogella GmbH and others.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *  Lars Vogel (Vogella GmbH) - initial implementation
+ *******************************************************************************/
+package org.eclipse.wildwebdeveloper.tests;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.lsp4e.LSPEclipseUtils;
+import org.eclipse.lsp4e.LanguageServers;
+import org.eclipse.lsp4e.LanguageServersRegistry;
+import org.eclipse.lsp4j.DocumentSymbolParams;
+import org.eclipse.lsp4j.ServerCapabilities;
+import org.eclipse.lsp4j.TextDocumentIdentifier;
+import org.eclipse.lsp4j.services.LanguageServer;
+import org.eclipse.ui.PlatformUI;
+import org.eclipse.ui.ide.IDE;
+import org.eclipse.ui.tests.harness.util.DisplayHelper;
+import org.eclipse.ui.texteditor.AbstractTextEditor;
+import org.eclipse.wildwebdeveloper.Activator;
+import org.eclipse.wildwebdeveloper.json.JSonLanguageServer;
+import org.eclipse.wildwebdeveloper.json.ui.preferences.JSonPreferenceServerConstants;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+@ExtendWith(AllCleanRule.class)
+class TestJSONResultLimitPreference {
+
+	private static final int KEYS = 60;
+	private static final int REDUCED_LIMIT = 5;
+
+	private IProject project;
+
+	@BeforeEach
+	void setUpProject() throws Exception {
+		this.project = ResourcesPlugin.getWorkspace().getRoot().getProject(getClass().getName() + System.nanoTime());
+		project.create(null);
+		project.open(null);
+	}
+
+	@AfterEach
+	void resetPreference() {
+		Activator.getDefault().getPreferenceStore().setValue(
+				JSonPreferenceServerConstants.JSON_PREFERENCES_MAXITEMSCOMPUTED,
+				JSonPreferenceServerConstants.MAXITEMSCOMPUTED_DEFAULT);
+	}
+
+	@Test
+	void testResultLimitPreferenceAppliesWithoutRestart() throws Exception {
+		StringBuilder content = new StringBuilder("{\n");
+		for (int i = 0; i < KEYS; i++) {
+			content.append("  \"key_").append(i).append("\": ").append(i).append(i == KEYS - 1 ? "\n" : ",\n");
+		}
+		content.append("}\n");
+
+		IFile file = project.getFile("limit.json");
+		file.create(content.toString().getBytes(StandardCharsets.UTF_8), true, false, null);
+
+		AbstractTextEditor editor = (AbstractTextEditor) IDE.openEditor(
+				PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage(), file,
+				"org.eclipse.ui.genericeditor.GenericEditor");
+		IDocument document = LSPEclipseUtils.getDocument(editor);
+		DisplayHelper.sleep(2000);
+
+		assertEquals(KEYS, countSymbols(document), "Default limit should not truncate this document");
+
+		Activator.getDefault().getPreferenceStore()
+				.setValue(JSonPreferenceServerConstants.JSON_PREFERENCES_MAXITEMSCOMPUTED, REDUCED_LIMIT);
+		DisplayHelper.sleep(1500); // allow the asynchronous preference broadcast
+
+		// exact, so that an empty result does not silently satisfy the assertion
+		assertEquals(REDUCED_LIMIT, countSymbols(document),
+				"Lowering the limit should truncate the outline to exactly that many symbols");
+	}
+
+	private static int countSymbols(IDocument document) throws Exception {
+		DocumentSymbolParams params = new DocumentSymbolParams(
+				new TextDocumentIdentifier(LSPEclipseUtils.toUri(document).toString()));
+		return jsonLanguageServer(document).getTextDocumentService().documentSymbol(params).get(10, TimeUnit.SECONDS)
+				.size();
+	}
+
+	private static LanguageServer jsonLanguageServer(IDocument document) throws Exception {
+		return LanguageServers.forDocument(document) //
+				.withCapability(ServerCapabilities::getDocumentSymbolProvider) //
+				.collectAll((wrapper, ls) -> CompletableFuture.completedFuture( //
+						LanguageServersRegistry.getInstance()
+								.getDefinition(JSonLanguageServer.JSON_LANGUAGE_SERVER_ID)
+								.equals(wrapper.serverDefinition) ? ls : null)) //
+				.get(10, TimeUnit.SECONDS).stream() //
+				.filter(Objects::nonNull) //
+				.findFirst() //
+				.orElseThrow(() -> new AssertionError("Expected a running JSON language server for the document"));
+	}
+}

org.eclipse.wildwebdeveloper/META-INF/MANIFEST.MF

@@ -41,4 +41,6 @@ Export-Package: org.eclipse.wildwebdeveloper;x-friends:="org.eclipse.wildwebdeve
  org.eclipse.wildwebdeveloper.debug.npm;x-internal:=true,
  org.eclipse.wildwebdeveloper.markdown;x-friends:="org.eclipse.wildwebdeveloper.tests",
  org.eclipse.wildwebdeveloper.jsts;x-friends:="org.eclipse.wildwebdeveloper.tests",
- org.eclipse.wildwebdeveloper.jsts.ui.preferences;x-friends:="org.eclipse.wildwebdeveloper.tests"
+ org.eclipse.wildwebdeveloper.jsts.ui.preferences;x-friends:="org.eclipse.wildwebdeveloper.tests",
+ org.eclipse.wildwebdeveloper.json;x-friends:="org.eclipse.wildwebdeveloper.tests",
+ org.eclipse.wildwebdeveloper.json.ui.preferences;x-friends:="org.eclipse.wildwebdeveloper.tests"

org.eclipse.wildwebdeveloper/plugin.properties

@@ -48,6 +48,7 @@ JSTSFormatterPreferencePage.name=Formatter
 
 # Markdown
 MarkdownPreferencePage.name=Markdown (Wild Web Developer)
+JSonPreferencePage.name=JSON (Wild Web Developer)
 MarkdownProblem=Markdown Problem
 
 # YAML
@@ -69,3 +70,4 @@ preferenceKeywords.scss=scss
 preferenceKeywords.sass=sass
 preferenceKeywords.html=html
 preferenceKeywords.markdown=markdown
+preferenceKeywords.json=json

org.eclipse.wildwebdeveloper/plugin.xml

@@ -131,6 +131,19 @@
       </contentTypeMapping>
    </extension>
 
+   <extension point="org.eclipse.ui.preferencePages">
+      <page class="org.eclipse.wildwebdeveloper.json.ui.preferences.JSonPreferencePage"
+            id="org.eclipse.wildwebdeveloper.json.ui.preferences.JSonPreferencePage"
+            name="%JSonPreferencePage.name">
+            <keywordReference id="org.eclipse.wildwebdeveloper.json" />
+      </page>
+   </extension>
+   <extension point="org.eclipse.core.runtime.preferences"
+         id="JSonPreferenceInitializer"
+         name="JSonPreferenceInitializer">
+      <initializer class="org.eclipse.wildwebdeveloper.json.ui.preferences.JSonPreferenceInitializer" />
+   </extension>
+
    <!-- Markdown Language -->
    <extension point="org.eclipse.lsp4e.languageServer">
       <server id="org.eclipse.wildwebdeveloper.markdown"
@@ -1092,6 +1105,7 @@
    </extension>
    <extension point="org.eclipse.ui.keywords">
       <keyword label="%preferenceKeywords.yaml" id="org.eclipse.wildwebdeveloper.yaml"  />
+      <keyword label="%preferenceKeywords.json" id="org.eclipse.wildwebdeveloper.json" />
       <keyword label="%preferenceKeywords.js" id="org.eclipse.wildwebdeveloper.js" />
       <keyword label="%preferenceKeywords.ts" id="org.eclipse.wildwebdeveloper.ts" />
       <keyword label="%preferenceKeywords.javascript" id="org.eclipse.wildwebdeveloper.javascript" />

org.eclipse.wildwebdeveloper/src/org/eclipse/wildwebdeveloper/json/JSonLanguageServer.java

@@ -37,7 +37,7 @@
 import org.eclipse.lsp4e.LanguageServers;
 import org.eclipse.lsp4e.LanguageServersRegistry;
 import org.eclipse.lsp4e.LanguageServersRegistry.LanguageServerDefinition;
-import org.eclipse.lsp4e.server.ProcessStreamConnectionProvider;
+import org.eclipse.lsp4j.DidChangeConfigurationParams;
 import org.eclipse.lsp4j.InitializeResult;
 import org.eclipse.lsp4j.jsonrpc.messages.Message;
 import org.eclipse.lsp4j.jsonrpc.messages.ResponseMessage;
@@ -46,20 +46,26 @@
 import org.eclipse.wildwebdeveloper.SchemaAssociationRegistry;
 import org.eclipse.wildwebdeveloper.SchemaAssociationsPreferenceInitializer;
 import org.eclipse.wildwebdeveloper.embedder.node.NodeJSManager;
+import org.eclipse.wildwebdeveloper.json.ui.preferences.JSonPreferenceServerConstants;
+import org.eclipse.wildwebdeveloper.ui.preferences.ProcessStreamConnectionProviderWithPreference;
 
 import com.google.gson.Gson;
 import com.google.gson.reflect.TypeToken;
 
 @SuppressWarnings("restriction")
-public class JSonLanguageServer extends ProcessStreamConnectionProvider {
+public class JSonLanguageServer extends ProcessStreamConnectionProviderWithPreference {
 
 	public final static String SCHEMA_EXT = "org.eclipse.wildwebdeveloper.json.schema"; //$NON-NLS-1$
 	public final static String PATTERN_ATTR = "pattern"; //$NON-NLS-1$
 	public final static String URL_ATTR = "url"; //$NON-NLS-1$
 
+	public static final String JSON_LANGUAGE_SERVER_ID = "org.eclipse.wildwebdeveloper.json"; //$NON-NLS-1$
+
+	private static final String[] SUPPORTED_SECTIONS = { "json" }; //$NON-NLS-1$
+
 	private static final IPreferenceStore PREFERENCE_STORE = Activator.getDefault().getPreferenceStore();
 	private static final LanguageServerDefinition JSON_LS_DEFINITION = LanguageServersRegistry.getInstance()
-			.getDefinition("org.eclipse.wildwebdeveloper.json");
+			.getDefinition(JSON_LANGUAGE_SERVER_ID);
 	private static final IPropertyChangeListener PROPERTY_CHANGE_LISTENER = new IPropertyChangeListener() {
 		@Override
 		public void propertyChange(PropertyChangeEvent event) {
@@ -74,6 +80,7 @@ public void propertyChange(PropertyChangeEvent event) {
 	};
 
 	public JSonLanguageServer() {
+		super(JSON_LANGUAGE_SERVER_ID, PREFERENCE_STORE, SUPPORTED_SECTIONS);
 		List<String> commands = new ArrayList<>();
 		commands.add(NodeJSManager.getNodeJsLocation().getAbsolutePath());
 		try {
@@ -96,10 +103,16 @@ public void handleMessage(Message message, LanguageServer languageServer, URI ro
 				// Language server side.
 				JSonLanguageServerInterface server = (JSonLanguageServerInterface) languageServer;
 				server.sendJSonchemaAssociations(getSchemaAssociations());
+				server.getWorkspaceService().didChangeConfiguration(new DidChangeConfigurationParams(createSettings()));
 			}
 		}
 	}
 
+	@Override
+	protected Object createSettings() {
+		return JSonPreferenceServerConstants.getGlobalSettings();
+	}
+
 	private static Map<String, List<String>> getSchemaAssociations() {
 		Map<String, List<String>> associations = new HashMap<>();
 		fillSchemaAssociationsFromPreferenceStore(associations);

org.eclipse.wildwebdeveloper/src/org/eclipse/wildwebdeveloper/json/ui/Messages.java

@@ -0,0 +1,28 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Vogella GmbH and others.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *  Lars Vogel (Vogella GmbH) - initial implementation
+ *******************************************************************************/
+package org.eclipse.wildwebdeveloper.json.ui;
+
+import org.eclipse.osgi.util.NLS;
+
+/**
+ * JSON messages keys.
+ *
+ */
+public class Messages extends NLS {
+
+	// --------- JSON Main preference page
+	public static String JSonPreferencePage_maxItemsComputed;
+
+	static {
+		NLS.initializeMessages("org.eclipse.wildwebdeveloper.json.ui.messages", Messages.class); //$NON-NLS-1$
+	}
+}

org.eclipse.wildwebdeveloper/src/org/eclipse/wildwebdeveloper/json/ui/messages.properties

@@ -0,0 +1,14 @@
+#/*******************************************************************************
+# * Copyright (c) 2026 Vogella GmbH and others.
+# * This program and the accompanying materials are made
+# * available under the terms of the Eclipse Public License 2.0
+# * which is available at https://www.eclipse.org/legal/epl-2.0/
+# *
+# * SPDX-License-Identifier: EPL-2.0
+# *
+# * Contributors:
+# *  Lars Vogel (Vogella GmbH) - initial implementation
+# *******************************************************************************/
+
+# Preference main page
+JSonPreferencePage_maxItemsComputed=The maximum number of outline symbols and folding\nregions computed (limited for performance reasons, 0 means no limit).

org.eclipse.wildwebdeveloper/src/org/eclipse/wildwebdeveloper/json/ui/preferences/JSonPreferenceInitializer.java

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Vogella GmbH and others.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *  Lars Vogel (Vogella GmbH) - initial implementation
+ *******************************************************************************/
+package org.eclipse.wildwebdeveloper.json.ui.preferences;
+
+import org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer;
+
+/**
+ * JSON preference initializer.
+ *
+ */
+public class JSonPreferenceInitializer extends AbstractPreferenceInitializer {
+
+	@Override
+	public void initializeDefaultPreferences() {
+		JSonPreferenceServerConstants.initializeDefaultPreferences();
+	}
+
+}

org.eclipse.wildwebdeveloper/src/org/eclipse/wildwebdeveloper/json/ui/preferences/JSonPreferencePage.java

@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Vogella GmbH and others.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *  Lars Vogel (Vogella GmbH) - initial implementation
+ *******************************************************************************/
+package org.eclipse.wildwebdeveloper.json.ui.preferences;
+
+import static org.eclipse.wildwebdeveloper.json.ui.preferences.JSonPreferenceServerConstants.JSON_PREFERENCES_MAXITEMSCOMPUTED;
+
+import org.eclipse.jface.preference.FieldEditorPreferencePage;
+import org.eclipse.jface.preference.IntegerFieldEditor;
+import org.eclipse.ui.IWorkbench;
+import org.eclipse.ui.IWorkbenchPreferencePage;
+import org.eclipse.wildwebdeveloper.Activator;
+import org.eclipse.wildwebdeveloper.json.ui.Messages;
+
+/**
+ * JSON main preference page.
+ *
+ */
+public class JSonPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {
+
+	public JSonPreferencePage() {
+		super(GRID);
+	}
+
+	@Override
+	public void init(IWorkbench workbench) {
+		setPreferenceStore(Activator.getDefault().getPreferenceStore());
+	}
+
+	@Override
+	protected void createFieldEditors() {
+		IntegerFieldEditor maxItemsComputed = new IntegerFieldEditor(JSON_PREFERENCES_MAXITEMSCOMPUTED,
+				Messages.JSonPreferencePage_maxItemsComputed, getFieldEditorParent());
+		maxItemsComputed.setValidRange(0, Integer.MAX_VALUE);
+		addField(maxItemsComputed);
+	}
+
+}