[ADD] Translation feature

This commit brings back the possibility to translate text nodes and
the attributes "label", "title", "placeholder", and "alt" in an app
configured with a suitable translation function.

It is also possible to deactivate translations under a node via
the directive t-translation="off".

For flexibility it is possible to define the list of translatable
attributes in the app.

tests/qweb/__snapshots__/translation.test.ts.snap

@@ -0,0 +1,71 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`translation support can translate node content 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component } = bdom;
+  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, shallowEqual } = helpers;
+  
+  let block1 = createBlock(\`<div>mot</div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    return block1();
+  }
+}"
+`;
+
+exports[`translation support does not translate node content if disabled 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component } = bdom;
+  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, shallowEqual } = helpers;
+  
+  let block1 = createBlock(\`<div><span>mot</span><span>word</span></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    return block1();
+  }
+}"
+`;
+
+exports[`translation support some attributes are translated 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component } = bdom;
+  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, shallowEqual } = helpers;
+  
+  let block1 = createBlock(\`<div><p label=\\"mot\\">mot</p><p title=\\"mot\\">mot</p><p placeholder=\\"mot\\">mot</p><p alt=\\"mot\\">mot</p><p something=\\"word\\">mot</p></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    return block1();
+  }
+}"
+`;
+
+exports[`translation support translation is done on the trimmed text, with extra spaces readded after 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component } = bdom;
+  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, shallowEqual } = helpers;
+  
+  let block1 = createBlock(\`<div> mot </div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    return block1();
+  }
+}"
+`;
+
+exports[`translation support can set translatable attributes 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component } = bdom;
+  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, shallowEqual } = helpers;
+  
+  let block1 = createBlock(\`<div tomato=\\"word\\" potato=\\"mot\\" title=\\"word\\">text</div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    return block1();
+  }
+}"
+`;

tests/qweb/parser.test.ts

@@ -1126,4 +1126,47 @@ describe("qweb parser", () => {
       name: "myBlock",
     });
   });
+
+  // ---------------------------------------------------------------------------
+  // t-translation
+  // ---------------------------------------------------------------------------
+  test('t-translation="off"', async () => {
+    expect(parse(`<t t-translation="off">word</t>`)).toEqual({
+      type: ASTType.TTranslation,
+      content: {
+        type: ASTType.Text,
+        value: "word",
+      },
+    });
+
+    expect(parse(`<div t-foreach="list" t-translation="off" t-as="item">word</div>`)).toEqual({
+      body: {
+        content: {
+          attrs: {},
+          content: [
+            {
+              type: 0,
+              value: "word",
+            },
+          ],
+          on: {},
+          ref: null,
+          tag: "div",
+          type: 2,
+        },
+        type: 16,
+      },
+      collection: "list",
+      elem: "item",
+      hasNoComponent: true,
+      hasNoFirst: true,
+      hasNoIndex: true,
+      hasNoLast: true,
+      hasNoValue: true,
+      isOnlyChild: false,
+      key: null,
+      memo: "",
+      type: 9,
+    });
+  });
 });

tests/qweb/translation.test.ts

@@ -0,0 +1,116 @@
+import { App, Component } from "../../src";
+import { makeTestFixture, snapshotApp } from "../helpers";
+import { xml } from "../../src/tags";
+
+let fixture: HTMLElement;
+
+beforeEach(() => {
+  fixture = makeTestFixture();
+});
+
+describe("translation support", () => {
+  test("can translate node content", async () => {
+    class SomeComponent extends Component {
+      static template = xml`<div>word</div>`;
+    }
+
+    const app = new App(SomeComponent);
+    app.configure({
+      translateFn: (expr: string) => (expr === "word" ? "mot" : expr),
+    });
+    const comp = await app.mount(fixture);
+
+    const el = comp.el as HTMLElement;
+
+    expect(el.outerHTML).toBe("<div>mot</div>");
+    snapshotApp(app);
+  });
+
+  test("does not translate node content if disabled", async () => {
+    class SomeComponent extends Component {
+      static template = xml`
+        <div>
+          <span>word</span>
+          <span t-translation="off">word</span>
+        </div>
+      `;
+    }
+
+    const app = new App(SomeComponent);
+    app.configure({
+      translateFn: (expr: string) => (expr === "word" ? "mot" : expr),
+    });
+    const comp = await app.mount(fixture);
+
+    const el = comp.el as HTMLElement;
+
+    expect(el.outerHTML).toBe("<div><span>mot</span><span>word</span></div>");
+    snapshotApp(app);
+  });
+
+  test("some attributes are translated", async () => {
+    class SomeComponent extends Component {
+      static template = xml`
+        <div>
+          <p label="word">word</p>
+          <p title="word">word</p>
+          <p placeholder="word">word</p>
+          <p alt="word">word</p>
+          <p something="word">word</p>
+        </div>
+      `;
+    }
+
+    const app = new App(SomeComponent);
+    app.configure({
+      translateFn: (expr: string) => (expr === "word" ? "mot" : expr),
+    });
+    const comp = await app.mount(fixture);
+
+    const el = comp.el as HTMLElement;
+
+    expect(el.outerHTML).toBe(
+      '<div><p label="mot">mot</p><p title="mot">mot</p><p placeholder="mot">mot</p><p alt="mot">mot</p><p something="word">mot</p></div>'
+    );
+    snapshotApp(app);
+  });
+
+  test("can set translatable attributes", async () => {
+    class SomeComponent extends Component {
+      static template = xml`
+        <div tomato="word" potato="word" title="word">text</div>
+      `;
+    }
+
+    const app = new App(SomeComponent);
+    app.configure({
+      translateFn: (expr: string) => (expr === "word" ? "mot" : expr),
+      translatableAttributes: ["potato"],
+    });
+    const comp = await app.mount(fixture);
+
+    const el = comp.el as HTMLElement;
+    expect(el.outerHTML).toBe('<div tomato="word" potato="mot" title="word">text</div>');
+    snapshotApp(app);
+  });
+
+  test("translation is done on the trimmed text, with extra spaces readded after", async () => {
+    class SomeComponent extends Component {
+      static template = xml`
+        <div> word </div>
+      `;
+    }
+
+    const translateFn = jest.fn((expr: string) => (expr === "word" ? "mot" : expr));
+
+    const app = new App(SomeComponent);
+    app.configure({ translateFn });
+    const comp = await app.mount(fixture);
+
+    const el = comp.el as HTMLElement;
+
+    expect(el.outerHTML).toBe("<div> mot </div>");
+    expect(translateFn).toHaveBeenCalledWith("word");
+    snapshotApp(app);
+  });
+});