imp: allow object descriptors for attributes

close #6

tests/__snapshots__/qweb.test.ts.snap

@@ -188,7 +188,20 @@ exports[`attributes t-att-class and class should combine together 1`] = `
     let _1 = 'hello';
     let _3 = context['value'];
     let _2 = 'hello' + (_3 ? ' ' + _3 : '');
-    let c4 = [], p4 = {key:4,attrs:{class: _1,class: _2}};
+    let c4 = [], p4 = {key:4,attrs:{class: _2}};
+    let vn4 = h('div', p4, c4);
+    return vn4;
+}"
+`;
+
+exports[`attributes t-att-class with object 1`] = `
+"function anonymous(context,extra
+) {
+    let h = this.utils.h;
+    let _1 = 'static';
+    let _3 = this.utils.objectToAttrString({a: context['b'],c: context['d'],e: context['f']});
+    let _2 = 'static' + (_3 ? ' ' + _3 : '');
+    let c4 = [], p4 = {key:4,attrs:{class: _2}};
     let vn4 = h('div', p4, c4);
     return vn4;
 }"

tests/qweb.test.ts

@@ -464,6 +464,15 @@ describe("attributes", () => {
     const result = renderToString(qweb, "test", { value: "world" });
     expect(result).toBe(`<div class="hello world"></div>`);
   });
+
+  test("t-att-class with object", () => {
+    qweb.addTemplate(
+      "test",
+      `<div class="static" t-att-class="{a: b, c: d, e: f}"/>`
+    );
+    const result = renderToString(qweb, "test", { b: true, d: false, f: true });
+    expect(result).toBe(`<div class="static a e"></div>`);
+  });
 });
 
 describe("t-call (template calling", () => {