refactor: move angular source to /packages rather than modules/@angular

packages/compiler/src/assertions.ts

@@ -0,0 +1,47 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {isDevMode} from '@angular/core';
+
+
+export function assertArrayOfStrings(identifier: string, value: any) {
+  if (!isDevMode() || value == null) {
+    return;
+  }
+  if (!Array.isArray(value)) {
+    throw new Error(`Expected '${identifier}' to be an array of strings.`);
+  }
+  for (let i = 0; i < value.length; i += 1) {
+    if (typeof value[i] !== 'string') {
+      throw new Error(`Expected '${identifier}' to be an array of strings.`);
+    }
+  }
+}
+
+const INTERPOLATION_BLACKLIST_REGEXPS = [
+  /^\s*$/,        // empty
+  /[<>]/,         // html tag
+  /^[{}]$/,       // i18n expansion
+  /&(#|[a-z])/i,  // character reference,
+  /^\/\//,        // comment
+];
+
+export function assertInterpolationSymbols(identifier: string, value: any): void {
+  if (value != null && !(Array.isArray(value) && value.length == 2)) {
+    throw new Error(`Expected '${identifier}' to be an array, [start, end].`);
+  } else if (isDevMode() && value != null) {
+    const start = value[0] as string;
+    const end = value[1] as string;
+    // black list checking
+    INTERPOLATION_BLACKLIST_REGEXPS.forEach(regexp => {
+      if (regexp.test(start) || regexp.test(end)) {
+        throw new Error(`['${start}', '${end}'] contains unusable interpolation symbol.`);
+      }
+    });
+  }
+}