add support for textDocument/definition

src/jsonLanguageService.ts

@@ -23,8 +23,9 @@ import {
 	FoldingRange, JSONSchema, SelectionRange, FoldingRangesContext, DocumentSymbolsContext, ColorInformationContext as DocumentColorsContext,
 	TextDocument,
 	Position, CompletionItem, CompletionList, Hover, Range, SymbolInformation, Diagnostic,
-	TextEdit, FormattingOptions, DocumentSymbol
+	TextEdit, FormattingOptions, DocumentSymbol, DefinitionLink
 } from './jsonLanguageTypes';
+import { findDefinition } from './services/jsonDefinition';
 
 export type JSONDocument = {};
 export * from './jsonLanguageTypes';
@@ -47,6 +48,7 @@ export interface LanguageService {
 	format(document: TextDocument, range: Range, options: FormattingOptions): TextEdit[];
 	getFoldingRanges(document: TextDocument, context?: FoldingRangesContext): FoldingRange[];
 	getSelectionRanges(document: TextDocument, positions: Position[], doc: JSONDocument): SelectionRange[];
+	findDefinition(document: TextDocument, position: Position, doc: JSONDocument): Thenable<DefinitionLink[]>;
 }
 
 
@@ -85,6 +87,7 @@ export function getLanguageService(params: LanguageServiceParams): LanguageServi
 		doHover: jsonHover.doHover.bind(jsonHover),
 		getFoldingRanges,
 		getSelectionRanges,
+		findDefinition,
 		format: (d, r, o) => {
 			let range: JSONCRange | undefined = undefined;
 			if (r) {

src/services/jsonDefinition.ts

@@ -0,0 +1,96 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { JSONSchemaRef, JSONSchema } from '../jsonSchema';
+import { DefinitionLink, Position, TextDocument, ASTNode, PropertyASTNode, Range, Thenable } from '../jsonLanguageTypes';
+import { JSONDocument } from '../parser/jsonParser';
+
+export function findDefinition(document: TextDocument, position: Position, doc: JSONDocument): Thenable<DefinitionLink[]> {
+	const offset = document.offsetAt(position);
+	const node = doc.getNodeFromOffset(offset, true);
+	if (!node || !isRef(node)) {
+		return Promise.resolve([]);
+	}
+
+	const propertyNode: PropertyASTNode = node.parent as PropertyASTNode;
+	const valueNode = propertyNode.valueNode as ASTNode;
+	const path = valueNode.value as string;
+	const targetNode = findTargetNode(doc, path);
+	if (!targetNode) {
+		return Promise.resolve([]);
+	}
+	const definition: DefinitionLink = {
+		targetUri: document.uri,
+		originSelectionRange: createRange(document, valueNode),
+		targetRange: createRange(document, targetNode),
+		targetSelectionRange: createRange(document, targetNode)
+	};
+	return Promise.resolve([definition]);
+}
+
+function createRange(document: TextDocument, node: ASTNode): Range {
+	return Range.create(document.positionAt(node.offset), document.positionAt(node.offset + node.length));
+}
+
+function isRef(node: ASTNode): boolean {
+	return node.type === 'string' &&
+		node.parent &&
+		node.parent.type === 'property' &&
+		node.parent.valueNode === node &&
+		node.parent.keyNode.value === "$ref" ||
+		false;
+}
+
+function findTargetNode(doc: JSONDocument, path: string): ASTNode | null {
+	const tokens = parseJSONPointer(path);
+	if (!tokens) {
+		return null;
+	}
+	return findNode(tokens, doc.root);
+}
+
+function findNode(pointer: string[], node: ASTNode | null | undefined): ASTNode | null {
+	if (!node) {
+		return null;
+	}
+	if (pointer.length === 0) {
+		return node;
+	}
+
+	const token: string = pointer.shift() as string;
+	if (node && node.type === 'object') {
+		const propertyNode: PropertyASTNode | undefined = node.properties.find((propertyNode) => propertyNode.keyNode.value === token);
+		if (!propertyNode) {
+			return null;
+		}
+		return findNode(pointer, propertyNode.valueNode);
+	} else if (node && node.type === 'array') {
+		if (token.match(/^(0|[1-9][0-9]*)$/)) {
+			const index = Number.parseInt(token);
+			const arrayItem = node.items[index];
+			if (!arrayItem) {
+				return null;
+			}
+			return findNode(pointer, arrayItem);
+		}
+	}
+	return null;
+}
+
+function parseJSONPointer(path: string): string[] | null {
+	if (path === "#") {
+		return [];
+	}
+
+	if (path[0] !== '#' || path[1] !== '/') {
+		return null;
+	}
+
+	return path.substring(2).split(/\//).map(unescape);
+}
+
+function unescape(str: string): string {
+	return str.replace(/~1/g, '/').replace(/~0/g, '~');
+}

src/test/definition.test.ts

@@ -0,0 +1,66 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as assert from 'assert';
+
+import { getLanguageService, JSONSchema, TextDocument, ClientCapabilities, CompletionList, CompletionItemKind, Position, MarkupContent } from '../jsonLanguageService';
+import { repeat } from '../utils/strings';
+import { DefinitionLink } from 'vscode-languageserver-types';
+
+suite('JSON Find Definitions', () => {
+	const testFindDefinitionFor = function (value: string, expected: {offset: number, length: number} | null): PromiseLike<void> {
+		const offset = value.indexOf('|');
+		value = value.substr(0, offset) + value.substr(offset + 1);
+
+		const ls = getLanguageService({ clientCapabilities: ClientCapabilities.LATEST });
+		const document = TextDocument.create('test://test/test.json', 'json', 0, value);
+		const position = Position.create(0, offset);
+		const jsonDoc = ls.parseJSONDocument(document);
+		return ls.findDefinition(document, position, jsonDoc).then(list => {
+			if (expected) {
+				assert.notDeepEqual(list, []);
+				const startOffset = list[0].targetRange.start.character;
+				assert.equal(startOffset, expected.offset);
+				assert.equal(list[0].targetRange.end.character - startOffset, expected.length);
+			} else {
+				assert.deepEqual(list, []);
+			}
+		});
+	};
+
+	test('FindDefinition invalid ref', async function () {
+		await testFindDefinitionFor('{|}', null);
+		await testFindDefinitionFor('{"name": |"John"}', null);
+		await testFindDefinitionFor('{"|name": "John"}', null);
+		await testFindDefinitionFor('{"name": "|John"}', null);
+		await testFindDefinitionFor('{"name": "John", "$ref": "#/|john/name"}', null);
+		await testFindDefinitionFor('{"name": "John", "$ref|": "#/name"}', null);
+		await testFindDefinitionFor('{"name": "John", "$ref": "#/|"}', null);
+	});
+
+	test('FindDefinition valid ref', async function () {
+		await testFindDefinitionFor('{"name": "John", "$ref": "#/n|ame"}', {offset: 9, length: 6});
+		await testFindDefinitionFor('{"name": "John", "$ref": "|#/name"}', {offset: 9, length: 6});
+		await testFindDefinitionFor('{"name": "John", "$ref": |"#/name"}', {offset: 9, length: 6});
+		await testFindDefinitionFor('{"name": "John", "$ref": "#/name"|}', {offset: 9, length: 6});
+		await testFindDefinitionFor('{"name": "John", "$ref": "#/name|"}', {offset: 9, length: 6});
+		await testFindDefinitionFor('{"name": "John", "$ref": "#|"}', {offset: 0, length: 29});
+
+		const doc = (ref: string) => `{"foo": ["bar", "baz"],"": 0,"a/b": 1,"c%d": 2,"e^f": 3,"i\\\\j": 5,"k\\"l": 6," ": 7,"m~n": 8, "$ref": "|${ref}"}`;
+		await testFindDefinitionFor(doc('#'), {offset: 0, length: 105});
+		await testFindDefinitionFor(doc('#/foo'), {offset: 8, length: 14});
+		await testFindDefinitionFor(doc('#/foo/0'), {offset: 9, length: 5});
+		await testFindDefinitionFor(doc('#/foo/1'), {offset: 16, length: 5});
+		await testFindDefinitionFor(doc('#/foo/01'), null);
+		await testFindDefinitionFor(doc('#/'), {offset: 27, length: 1});
+		await testFindDefinitionFor(doc('#/a~1b'), {offset: 36, length: 1});
+		await testFindDefinitionFor(doc('#/c%d'), {offset: 45, length: 1});
+		await testFindDefinitionFor(doc('#/e^f'), {offset: 54, length: 1});
+		await testFindDefinitionFor(doc('#/i\\\\j'), {offset: 64, length: 1});
+		await testFindDefinitionFor(doc('#/k\\"l'), {offset: 74, length: 1});
+		await testFindDefinitionFor(doc('#/ '), {offset: 81, length: 1});
+		await testFindDefinitionFor(doc('#/m~0n'), {offset: 90, length: 1});
+	});
+});