feat(maven): go to declaration for POM properties and parent-managed dependencies (#1887)

* feat(maven): go to declaration for POM properties and parent-managed dependencies

Ctrl/Cmd-click (or Go to Declaration) on a `${property}` reference in a
pom.xml opens the `<properties>` entry that defines it - the POM's own,
else the first one along the parent chain (a child's definition wins; an
active profile's counts as the POM's own) - and a dependency / plugin
whose version a `<dependencyManagement>` / `<pluginManagement>` entry
provides opens that managing declaration. The chain follows
`<relativePath>` in the project and the local repository (Settings >
Maven's, else ~/.m2) for external parents, which open read-only as plain
files; `project.*` built-ins go to their coordinate elements. When
nothing resolves under the caret, nothing navigates: the usual 'Cannot
find declaration to go to' hint shows instead.

The backend answers a caret position (0-based line / UTF-16 column) with
the winner's file, range and kind (maven_goto_declaration), reusing the
build model's POM reader and parent resolver (ide_build::maven) instead
of a new parser. The frontend contribution (build-tools.pomNavigation)
claims only positions that can resolve - inside a `${...}` reference or
a <dependency> / <plugin> element - so the Cmd-hover underline stays out
of the rest of the file.

Refs #1735

* test(maven): normalize expected goto paths like the parent chain does

parent_chain resolves every path it returns through dunce::canonicalize,
but the goto_declaration tests compared those results against raw temp
paths, which differ on the CI runners: on macOS the temp dir sits behind
the /var -> /private/var symlink and on Windows under the RUNNER~1 8.3
short name with backslash separators, so the Rust (macos-latest) and
Rust (windows-latest) jobs failed in the new assertions while the
functionality itself was right.

Feed the expected paths through the same canonicalization call before
comparing, mirroring the production behavior on every platform; on a
plain Linux checkout the canonical form equals the raw path, so the
assertions stay equivalent there.

Refs #1735

src/bindings.ts

@@ -730,6 +730,23 @@ export const commands = {
 	 *  (saved). Returns the declaration; nothing changes when it already excludes it.
 	 */
 	mavenExcludeDependency: (pom: string, dependency: ArtifactKey, exclusion: ArtifactKey) => typedError<Location, IdeError>(__TAURI_INVOKE("maven_exclude_dependency", { pom, dependency, exclusion })),
+	/**
+	 *  The go-to-declaration target at `pos` of a Maven POM: the definition of the
+	 *  `${property}` at the caret, or the `<dependencyManagement>` / `<pluginManagement>`
+	 *  entry providing the dependency's / plugin's version, along the parent chain.
+	 */
+	mavenGotoDeclaration: (pom: string, pos: Pos) => typedError<{
+	/**
+	 *  Absolute path of the file with the declaration: the POM itself, or a parent
+	 *  POM of the local repository when the definition is inherited from one.
+	 */
+	path: string,
+	range: Range,
+	/**  What was found. */
+	kind: PomGotoKind,
+	/**  The declaration as named for the user (`example.version`, `com.example:example-lib`). */
+	label: string,
+} | null, IdeError>(__TAURI_INVOKE("maven_goto_declaration", { pom, pos })),
 	/**
 	 *  Build › Build Project / Rebuild Project / Build Module (`file`: a file or folder of the
 	 *  module) / Build Artifacts, streaming the console and messages on `on_event`; cancellable
@@ -5899,6 +5916,29 @@ export type PluginsSnapshot = {
 	ui: UiContribution[],
 };
 
+/**  What a go-to-declaration in a POM found, and where. */
+export type PomGoto = {
+	/**
+	 *  Absolute path of the file with the declaration: the POM itself, or a parent
+	 *  POM of the local repository when the definition is inherited from one.
+	 */
+	path: string,
+	range: Range,
+	/**  What was found. */
+	kind: PomGotoKind,
+	/**  The declaration as named for the user (`example.version`, `com.example:example-lib`). */
+	label: string,
+};
+
+/**  The kind of declaration a POM go-to-declaration found. */
+export type PomGotoKind = 
+/**  A `<properties>` entry of the POM or one of its parents. */
+"property" | 
+/**  A `<dependencyManagement>` entry providing the dependency's version. */
+"managedDependency" | 
+/**  A `<pluginManagement>` entry providing the plugin's version. */
+"managedPlugin";
+
 /**  A 0-based line / UTF-16 column position. */
 export type Pos = {
 	line: number,

src/features/build-tools/index.ts

@@ -19,6 +19,7 @@ import {
 import { lazyComponent } from "@/ui";
 import { GradleView, MavenView } from "./BuildToolView";
 import { ExecutePopupHost } from "./ExecutePopup";
+import { pomNavigationExtension } from "./pomNavigation";
 import { buildToolsRunAnything } from "./runAnything";
 import { versionCatalogExtension } from "./versionCatalog";
 import { expandableKeys, gradleChildren, gradleRoots, mavenChildren, mavenRoots, gradleProjectKey } from "./model";
@@ -177,6 +178,7 @@ export function activate(): () => void {
   const disposers: Array<() => void> = [
     registerOverlay({ id: "build-tools.execute", component: ExecutePopupHost }),
     registerEditorContribution({ id: "build-tools.versionCatalog", extensions: versionCatalogExtension }),
+    registerEditorContribution({ id: "build-tools.pomNavigation", extensions: pomNavigationExtension }),
     registerRunAnythingProvider(buildToolsRunAnything),
     registerEditorKind({
       kind: ANALYZER_KIND,

src/features/build-tools/pomNavigation.test.ts

@@ -0,0 +1,167 @@
+import { describe, expect, it, vi } from "vitest";
+
+const ipc = vi.hoisted(() => ({ mavenGotoDeclaration: vi.fn() }));
+const workbench = vi.hoisted(() => ({ openFile: vi.fn() }));
+const hints = vi.hoisted(() => ({ showHint: vi.fn() }));
+
+vi.mock("@/platform/ipc", () => ({
+  call: async (p: Promise<{ status: string; data?: unknown; error?: unknown }>) => {
+    const r = await p;
+    if (r.status !== "ok") throw r.error;
+    return r.data;
+  },
+  commands: ipc,
+}));
+vi.mock("@/workbench/contributions", () => ({
+  editorService: () => workbench,
+}));
+vi.mock("@/editor/lsp/hint", () => ({ showHint: hints.showHint }));
+vi.mock("@/editor/api", () => ({
+  CONTRIBUTED_DEFINITION: "openideaDefinition",
+  whenSynced: () => Promise.resolve(),
+}));
+
+import { EditorState } from "@codemirror/state";
+import { inArtifactElement, pomNavigationExtension, propertyRefAt } from "./pomNavigation";
+
+const DEFINITION = "openideaDefinition";
+
+/** An editor state over `text` with the contribution for `path` installed. */
+function state(text: string, path = "/p/app/pom.xml") {
+  return EditorState.create({
+    doc: text,
+    extensions: [
+      pomNavigationExtension({
+        path,
+        language: "xml",
+        uiMode: "XML",
+        readOnly: false,
+      } as Parameters<typeof pomNavigationExtension>[0]),
+    ],
+  });
+}
+
+const definitionAt = (s: ReturnType<typeof state>, pos: number) =>
+  s.languageDataAt<(v: { state: typeof s }, p: number) => boolean>(DEFINITION, pos)[0];
+
+/** The definition only reads `view.state`; a bare handle is enough. */
+const run = (s: ReturnType<typeof state>, pos: number) => definitionAt(s, pos)!({ state: s }, pos);
+
+const pom = `<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <parent>
+    <groupId>com.example</groupId>
+    <artifactId>parent</artifactId>
+    <version>1.0</version>
+  </parent>
+  <artifactId>app</artifactId>
+  <properties>
+    <example.version>1.2.3</example.version>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>com.example</groupId>
+      <artifactId>example-lib</artifactId>
+      <version>\${example.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.example</groupId>
+      <artifactId>other-lib</artifactId>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
+</project>`;
+
+describe("POM property references", () => {
+  it("finds the reference spanning the caret, the $ and the } included", () => {
+    const at = pom.indexOf("${example.version}");
+    expect(propertyRefAt(pom, at)).toEqual({
+      from: at,
+      to: at + "${example.version}".length,
+    });
+    expect(propertyRefAt(pom, at + 1)).toEqual({
+      from: at,
+      to: at + "${example.version}".length,
+    });
+    expect(propertyRefAt(pom, at + "${example.version}".length - 1)).toEqual({
+      from: at,
+      to: at + "${example.version}".length,
+    });
+    // Outside a reference: none.
+    expect(propertyRefAt(pom, pom.indexOf("example-lib"))).toBeNull();
+    // A reference closed before the caret does not reach over it.
+    const afterRef = at + "${example.version}".length + 1;
+    expect(propertyRefAt(pom, afterRef)).toBeNull();
+  });
+});
+
+describe("POM artifact elements", () => {
+  it("sees a dependency or plugin element around the caret", () => {
+    expect(inArtifactElement(pom, pom.indexOf("<artifactId>example-lib"))).toBe(true);
+    expect(inArtifactElement(pom, pom.indexOf("example-lib</artifactId>"))).toBe(true);
+    expect(inArtifactElement(pom, pom.indexOf("<artifactId>maven-compiler-plugin"))).toBe(true);
+    expect(inArtifactElement(pom, pom.indexOf("${example.version}"))).toBe(true);
+  });
+
+  it("sees no artifact element outside dependencies and plugins", () => {
+    expect(inArtifactElement(pom, pom.indexOf("<properties>"))).toBe(false);
+    expect(inArtifactElement(pom, pom.indexOf("<parent>"))).toBe(false);
+    // `<plugins>` and `<dependencyManagement>` are not a `<plugin>` / `<dependency>`.
+    expect(inArtifactElement(pom, pom.indexOf("<plugins>"))).toBe(false);
+  });
+});
+
+describe("POM go to declaration", () => {
+  it("contributes a definition on a property reference and an artifact element only", () => {
+    const s = state(pom);
+    expect(definitionAt(s, pom.indexOf("${example.version}"))).toBeDefined();
+    expect(definitionAt(s, pom.indexOf("<artifactId>other-lib"))).toBeDefined();
+    expect(definitionAt(s, pom.indexOf("<artifactId>maven-compiler-plugin"))).toBeDefined();
+    expect(definitionAt(s, pom.indexOf("<properties>"))).toBeUndefined();
+    expect(definitionAt(s, pom.indexOf("<parent>"))).toBeUndefined();
+  });
+
+  it("opens the declaration the backend resolved", async () => {
+    const target = {
+      path: "/p/pom.xml",
+      range: { start: { line: 4, col: 6 }, end: { line: 4, col: 14 } },
+      kind: "property",
+      label: "example.version",
+    };
+    ipc.mavenGotoDeclaration.mockResolvedValue({ status: "ok", data: target });
+    const s = state(pom);
+    const at = pom.indexOf("${example.version}");
+    run(s, at);
+    await vi.waitFor(() =>
+      expect(workbench.openFile).toHaveBeenCalledWith("/p/pom.xml", {
+        selection: { line: 4, col: 6, endLine: 4, endCol: 14 },
+      }),
+    );
+    expect(ipc.mavenGotoDeclaration).toHaveBeenCalledWith("/p/app/pom.xml", {
+      line: pom.slice(0, at).split("\n").length - 1,
+      col: at - (pom.lastIndexOf("\n", at - 1) + 1),
+    });
+  });
+
+  it("says so when nothing resolves, without navigating", async () => {
+    ipc.mavenGotoDeclaration.mockResolvedValue({ status: "ok", data: null });
+    const s = state(pom);
+    const at = pom.indexOf("<artifactId>other-lib");
+    run(s, at);
+    await vi.waitFor(() => expect(hints.showHint).toHaveBeenCalled());
+    expect(workbench.openFile).not.toHaveBeenCalled();
+  });
+
+  it("contributes nothing outside a pom.xml", () => {
+    const s = state(pom, "/p/app/build.xml");
+    expect(definitionAt(s, pom.indexOf("${example.version}"))).toBeUndefined();
+    expect(ipc.mavenGotoDeclaration).not.toHaveBeenCalled();
+  });
+});

src/features/build-tools/pomNavigation.ts

@@ -0,0 +1,90 @@
+/**
+ * Go to declaration in `pom.xml`: ⌘/Ctrl-click (or ⌘B) on a `${property}` reference
+ * opens the `<properties>` entry that defines it — the POM's own, else one inherited
+ * along the parent chain (a parent POM outside the project opens from the local
+ * repository, read-only as a plain file) — and a dependency / plugin whose version a
+ * `<dependencyManagement>` / `<pluginManagement>` entry provides opens that managing
+ * declaration. The backend resolves both with the build model's POM reader and parent
+ * resolver; here only cheap eligibility is computed (a reference span, an artifact
+ * element), so the ⌘-hover underline stays out of the rest of the file, and nothing
+ * resolves to no jump at all: an unresolvable property or parent never navigates
+ * somewhere unrelated.
+ */
+import { EditorState, type Extension } from "@codemirror/state";
+import { CONTRIBUTED_DEFINITION, type ContributedDefinition, type EditorDocContext, whenSynced } from "@/editor/api";
+import { showHint } from "@/editor/lsp/hint";
+import { tx } from "@/platform/i18n";
+import { call, commands } from "@/platform/ipc";
+import { editorService } from "@/workbench/contributions";
+
+/** The `${property}` reference covering `at`, if any (clicking the `$` counts). */
+export function propertyRefAt(text: string, at: number): { from: number; to: number } | null {
+  const open = text.startsWith("${", at) ? at : text.lastIndexOf("${", at - 1);
+  if (open < 0) return null;
+  const close = text.indexOf("}", open + 2);
+  if (close < 0 || close < at) return null;
+  return { from: open, to: close + 1 };
+}
+
+/** Whether an opener of `name` before `at` has no closer of it yet (POM elements do not nest). */
+function inside(name: string, text: string, at: number): boolean {
+  const before = text.slice(0, at);
+  const count = (re: RegExp) => (before.match(re) ?? []).length;
+  return count(new RegExp(`<${name}[\\s>]`, "g")) > count(new RegExp(`</${name}\\s*>`, "g"));
+}
+
+/**
+ * Whether `at` may sit in a `<dependency>` / `<plugin>` element: an eligibility test
+ * only (a `<dependency>` inside a comment counts too) — whether the element's version
+ * actually comes from a management entry is the backend's answer.
+ */
+export function inArtifactElement(text: string, at: number): boolean {
+  return inside("dependency", text, at) || inside("plugin", text, at);
+}
+
+/** Go to declaration in a POM of the project (or an opened parent POM of the local repository). */
+export function pomNavigationExtension(ctx: EditorDocContext): Extension {
+  if (ctx.virtual || !/(^|\/)pom\.xml$/.test(ctx.path)) return [];
+  const eligible = (state: EditorState, pos: number) => {
+    const text = state.doc.toString();
+    return propertyRefAt(text, pos) !== null || inArtifactElement(text, pos);
+  };
+  const definition: ContributedDefinition = (view, pos) => {
+    if (!eligible(view.state, pos)) return false;
+    const doc = view.state.doc;
+    const line = doc.lineAt(pos);
+    void whenSynced(view)
+      .then(() =>
+        call(
+          commands.mavenGotoDeclaration(ctx.path, {
+            line: line.number - 1,
+            col: pos - line.from,
+          }),
+        ),
+      )
+      .then((goto) => {
+        if (!goto) {
+          showHint(view, tx`Cannot find declaration to go to`);
+          return;
+        }
+        if (view.state.doc !== doc) return; // The user kept typing while the POM resolved.
+        void editorService().openFile(goto.path, {
+          selection: {
+            line: goto.range.start.line,
+            col: goto.range.start.col,
+            endLine: goto.range.end.line,
+            endCol: goto.range.end.col,
+          },
+        });
+      })
+      .catch((e: unknown) =>
+        showHint(view, e instanceof Error ? e.message : String(e), {
+          tone: "error",
+        }),
+      );
+    return true;
+  };
+  return EditorState.languageData.of((state, pos) =>
+    eligible(state, pos) ? [{ [CONTRIBUTED_DEFINITION]: definition }] : [],
+  );
+}