fix(ivy): handle expressions in i18n attributes properly (#32309)

Prior to this commit, complex expressions (that require additional statements to be generated) were handled incorrectly in case they were used in attributes annotated with i18n flags. The problem was caused by the fact that extra statements were not appended to the temporary vars block, so they were missing in generated code. This commit updated the logic to use the `convertPropertyBinding`, which contains the necessary code to append extra statements. The `convertExpressionBinding` function was removed as it duplicates the `convertPropertyBinding` one (for the most part) and is no longer used.

PR Close #32309

packages/compiler-cli/test/compliance/r3_view_compiler_i18n_spec.ts

@@ -596,6 +596,46 @@ describe('i18n support in the template compiler', () => {
       verify(input, output);
     });
 
+    it('should support complex expressions in interpolation', () => {
+      const input = `
+        <div i18n-title title="{{valueA.getRawValue()?.getTitle()}} title"></div>
+      `;
+
+      const output = String.raw `
+        const $_c0$ = [${AttributeMarker.I18n}, "title"];
+        var $I18N_1$;
+        if (ngI18nClosureMode) {
+            const $MSG_EXTERNAL_3462388422673575127$$APP_SPEC_TS_2$ = goog.getMsg("{$interpolation} title", {
+              "interpolation": "\uFFFD0\uFFFD"
+            });
+            $I18N_1$ = $MSG_EXTERNAL_3462388422673575127$$APP_SPEC_TS_2$;
+        }
+        else {
+            $I18N_1$ = $localize \`$` +
+          String.raw `{"\uFFFD0\uFFFD"}:interpolation: title\`;
+        }
+        const $_c3$ = ["title", $I18N_1$];
+        …
+        consts: 2,
+        vars: 1,
+        template: function MyComponent_Template(rf, ctx) {
+          if (rf & 1) {
+            $r3$.ɵɵelementStart(0, "div", $_c0$);
+            $r3$.ɵɵi18nAttributes(1, $_c3$);
+            $r3$.ɵɵelementEnd();
+          }
+          if (rf & 2) {
+              var $tmp_0_0$ = null;
+              const $currVal_0$ = ($tmp_0_0$ = ctx.valueA.getRawValue()) == null ? null : $tmp_0_0$.getTitle();
+              $r3$.ɵɵi18nExp($currVal_0$);
+              $r3$.ɵɵi18nApply(1);
+          }
+        }
+      `;
+
+      verify(input, output);
+    });
+
     it('should support interpolation', () => {
       const input = `
         <div id="dynamic-1"
@@ -1055,22 +1095,25 @@ describe('i18n support in the template compiler', () => {
         <div i18n>
           {{ valueA | async }}
           {{ valueA?.a?.b }}
+          {{ valueA.getRawValue()?.getTitle() }}
         </div>
       `;
 
       const output = String.raw `
         var $I18N_0$;
         if (ngI18nClosureMode) {
-            const $MSG_EXTERNAL_1482713963707913023$$APP_SPEC_TS_0$ = goog.getMsg(" {$interpolation} {$interpolation_1} ", {
+            const $MSG_EXTERNAL_5146016486383316049$$APP_SPEC_TS_1$ = goog.getMsg(" {$interpolation} {$interpolation_1} {$interpolation_2} ", {
               "interpolation": "\uFFFD0\uFFFD",
-              "interpolation_1": "\uFFFD1\uFFFD"
+              "interpolation_1": "\uFFFD1\uFFFD",
+              "interpolation_2": "\uFFFD2\uFFFD"
             });
-            $I18N_0$ = $MSG_EXTERNAL_1482713963707913023$$APP_SPEC_TS_0$;
+            $I18N_0$ = $MSG_EXTERNAL_5146016486383316049$$APP_SPEC_TS_1$;
         }
         else {
             $I18N_0$ = $localize \` $` +
           String.raw `{"\uFFFD0\uFFFD"}:interpolation: $` +
-          String.raw `{"\uFFFD1\uFFFD"}:interpolation_1: \`;
+          String.raw `{"\uFFFD1\uFFFD"}:interpolation_1: $` +
+          String.raw `{"\uFFFD2\uFFFD"}:interpolation_2: \`;
         }
         …
         template: function MyComponent_Template(rf, ctx) {
@@ -1081,8 +1124,10 @@ describe('i18n support in the template compiler', () => {
             $r3$.ɵɵelementEnd();
           }
           if (rf & 2) {
+            var $tmp_2_0$ = null;
+            const $currVal_2$ = ($tmp_2_0$ = ctx.valueA.getRawValue()) == null ? null : $tmp_2_0$.getTitle();
             $r3$.ɵɵselect(1);
-            $r3$.ɵɵi18nExp($r3$.ɵɵpipeBind1(2, 2, ctx.valueA))(ctx.valueA == null ? null : ctx.valueA.a == null ? null : ctx.valueA.a.b);
+            $r3$.ɵɵi18nExp($r3$.ɵɵpipeBind1(2, 3, ctx.valueA))(ctx.valueA == null ? null : ctx.valueA.a == null ? null : ctx.valueA.a.b)($currVal_2$);
             $r3$.ɵɵi18nApply(1);
           }
         }
@@ -2615,9 +2660,9 @@ describe('i18n support in the template compiler', () => {
         function MyComponent_div_2_Template(rf, ctx) {
           if (rf & 1) {
             $r3$.ɵɵelementStart(0, "div", $_c2$);
-            i0.ɵɵtext(1, " ");
+            $r3$.ɵɵtext(1, " ");
             $r3$.ɵɵi18n(2, $I18N_3$);
-            i0.ɵɵtext(3, " ");
+            $r3$.ɵɵtext(3, " ");
             $r3$.ɵɵelementEnd();
           }
           if (rf & 2) {

packages/compiler/src/render3/view/template.ts

@@ -664,7 +664,7 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
                 hasBindings = true;
                 bindings.push({
                   sourceSpan: element.sourceSpan,
-                  value: () => this.convertExpressionBinding(expression)
+                  value: () => this.convertPropertyBinding(expression)
                 });
               });
             }
@@ -1155,19 +1155,12 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
         this._bindingScope.getOrCreateSharedContextVar(0);
   }
 
-  private convertExpressionBinding(value: AST): o.Expression {
-    const convertedPropertyBinding = convertPropertyBinding(
-        this, this.getImplicitReceiverExpr(), value, this.bindingContext(), BindingForm.TrySimple);
-    return convertedPropertyBinding.currValExpr;
-  }
-
   private convertPropertyBinding(value: AST): o.Expression {
     const convertedPropertyBinding = convertPropertyBinding(
         this, this.getImplicitReceiverExpr(), value, this.bindingContext(), BindingForm.TrySimple,
         () => error('Unexpected interpolation'));
     const valExpr = convertedPropertyBinding.currValExpr;
     this._tempVariables.push(...convertedPropertyBinding.stmts);
-
     return valExpr;
   }
 

packages/core/test/acceptance/i18n_spec.ts

@@ -75,14 +75,27 @@ onlyInIvy('Ivy i18n logic').describe('runtime i18n', () => {
   });
 
   it('should support interpolations with complex expressions', () => {
-    loadTranslations(
+    loadTranslations({
-        {'{$interpolation} - {$interpolation_1}': '{$interpolation} - {$interpolation_1} (fr)'});
+      ' {$interpolation} - {$interpolation_1} - {$interpolation_2} ':
-    const fixture =
+          ' {$interpolation} - {$interpolation_1} - {$interpolation_2} (fr) '
-        initWithTemplate(AppComp, `<div i18n>{{ name | uppercase }} - {{ obj?.a?.b }}</div>`);
+    });
-    expect(fixture.nativeElement.innerHTML).toEqual(`<div>ANGULAR -  (fr)</div>`);
+    const fixture = initWithTemplate(AppComp, `
-    fixture.componentRef.instance.obj = {a: {b: 'value'}};
+      <div i18n>
+        {{ name | uppercase }} -
+        {{ obj?.a?.b }} -
+        {{ obj?.getA()?.b }}
+      </div>
+    `);
+    // the `obj` field is not yet defined, so 2nd and 3rd interpolations return empty strings
+    expect(fixture.nativeElement.innerHTML).toEqual(`<div> ANGULAR -  -  (fr) </div>`);
+
+    fixture.componentRef.instance.obj = {
+      a: {b: 'value 1'},
+      getA: () => ({b: 'value 2'}),
+    };
     fixture.detectChanges();
-    expect(fixture.nativeElement.innerHTML).toEqual(`<div>ANGULAR - value (fr)</div>`);
+    expect(fixture.nativeElement.innerHTML)
+        .toEqual(`<div> ANGULAR - value 1 - value 2 (fr) </div>`);
   });
 
   it('should support elements', () => {
@@ -1057,6 +1070,25 @@ onlyInIvy('Ivy i18n logic').describe('runtime i18n', () => {
       expect(fixture.debugElement.children[0].children[0].references.ref.test).toBe('Set');
       expect(fixture.debugElement.children[1].children[0].references.ref.test).toBe('Set');
     });
+
+    it('with complex expressions', () => {
+      loadTranslations({
+        '{$interpolation} - {$interpolation_1} - {$interpolation_2}':
+            '{$interpolation} - {$interpolation_1} - {$interpolation_2} (fr)'
+      });
+      const fixture = initWithTemplate(AppComp, `
+        <div i18n-title title="{{ name | uppercase }} - {{ obj?.a?.b }} - {{ obj?.getA()?.b }}"></div>
+      `);
+      // the `obj` field is not yet defined, so 2nd and 3rd interpolations return empty strings
+      expect(fixture.nativeElement.firstChild.title).toEqual(`ANGULAR -  -  (fr)`);
+
+      fixture.componentRef.instance.obj = {
+        a: {b: 'value 1'},
+        getA: () => ({b: 'value 2'}),
+      };
+      fixture.detectChanges();
+      expect(fixture.nativeElement.firstChild.title).toEqual(`ANGULAR - value 1 - value 2 (fr)`);
+    });
   });
 
   it('should work with directives and host bindings', () => {