refactor(compiler): Support unary ops in template pipeline

Template Pipeline can now ingest and emit unary ops, such as `+` and `-`.

packages/compiler-cli/test/compliance/test_cases/r3_view_compiler/TEST_CASES.json

@@ -17,6 +17,23 @@
           "failureMessage": "Incorrect template"
         }
       ]
+    },
+    {
+      "description": "should handle binary and unary operators",
+      "inputFiles": [
+        "operators.ts"
+      ],
+      "expectations": [
+        {
+          "files": [
+            {
+              "expected": "operators_template.js",
+              "generated": "operators.js"
+            }
+          ],
+          "failureMessage": "Incorrect template"
+        }
+      ]
     }
   ]
 }

packages/compiler-cli/test/compliance/test_cases/r3_view_compiler/operators.ts

@@ -0,0 +1,15 @@
+import {Component, NgModule} from '@angular/core';
+
+@Component({
+  template: `
+    {{ 1 + 2 }}
+	{{ (1 % 2) + 3 / 4 * 5 }}
+	{{ +1 }}
+`
+})
+export class MyApp {
+}
+
+@NgModule({declarations: [MyApp]})
+export class MyModule {
+}

packages/compiler-cli/test/compliance/test_cases/r3_view_compiler/operators_template.js

@@ -0,0 +1,8 @@
+template: function MyApp_Template(rf, $ctx$) {
+	if (rf & 1) {
+	  $i0$.ɵɵtext(0);
+	} if (rf & 2) {
+	  i0.ɵɵtextInterpolate3(" ", 1 + 2, " ", 1 % 2 + 3 / 4 * 5, " ", +1, "\n");
+	}
+  }
+

packages/compiler/src/template/pipeline/ir/src/expression.ts

@@ -1043,6 +1043,8 @@ export function transformExpressionsInExpression(
   } else if (expr instanceof o.BinaryOperatorExpr) {
     expr.lhs = transformExpressionsInExpression(expr.lhs, transform, flags);
     expr.rhs = transformExpressionsInExpression(expr.rhs, transform, flags);
+  } else if (expr instanceof o.UnaryOperatorExpr) {
+    expr.expr = transformExpressionsInExpression(expr.expr, transform, flags);
   } else if (expr instanceof o.ReadPropExpr) {
     expr.receiver = transformExpressionsInExpression(expr.receiver, transform, flags);
   } else if (expr instanceof o.ReadKeyExpr) {

packages/compiler/src/template/pipeline/src/ingest.ts

@@ -637,7 +637,18 @@ function convertAst(
   } else if (ast instanceof e.LiteralPrimitive) {
     return o.literal(ast.value, undefined, convertSourceSpan(ast.span, baseSourceSpan));
   } else if (ast instanceof e.Unary) {
-    throw new Error('TODO: Support unary operations, which extend binary ops');
+    switch (ast.operator) {
+      case '+':
+        return new o.UnaryOperatorExpr(
+            o.UnaryOperator.Plus, convertAst(ast.expr, job, baseSourceSpan), undefined,
+            convertSourceSpan(ast.span, baseSourceSpan));
+      case '-':
+        return new o.UnaryOperatorExpr(
+            o.UnaryOperator.Minus, convertAst(ast.expr, job, baseSourceSpan), undefined,
+            convertSourceSpan(ast.span, baseSourceSpan));
+      default:
+        throw new Error(`AssertionError: unknown unary operator ${ast.operator}`);
+    }
   } else if (ast instanceof e.Binary) {
     const operator = BINARY_OPERATORS.get(ast.operation);
     if (operator === undefined) {