Introduce "platform configurations" to replace categories and libraries.dart.

tests/compiler/dart2js/platform_config_parser_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "package:compiler/src/platform_configuration.dart";
+import "package:expect/expect.dart";
+
+/// Runs the parser on [input] and compares it with [expectedResult]
+///
+/// A '*' in [input] indicates that the parser will report an error at the
+/// given point (On [input] with the "*" removed).
+test(String input, [Map<String, Map<String, String>> expectedOutput]) {
+  int starIndex = input.indexOf("*");
+  String inputWithoutStar = input.replaceFirst("*", "");
+
+  parse() => parseIni(inputWithoutStar.codeUnits,
+      allowedSections: new Set.from(["AA", "BB"]));
+
+  if (starIndex != -1) {
+    Expect.equals(expectedOutput, null);
+    Expect.throws(parse, (e) {
+      Expect.isTrue(e is FormatException);
+      Expect.equals(starIndex, e.offset);
+      return e is FormatException;
+    });
+  } else {
+    Map<String, Map<String, String>> result = parse();
+    Expect.equals(expectedOutput.length, result.length);
+    expectedOutput.forEach((String name, Map<String, String> properties) {
+      Expect.isTrue(expectedOutput.containsKey(name), "Missing section $name");
+      Expect.mapEquals(expectedOutput[name], properties);
+    });
+  }
+}
+
+main() {
+  // Empty file.
+  test(
+      """
+# Nothing here
+""",
+      {});
+
+  // Text outside section.
+  test("""
+*aaa
+""");
+
+  // Malformed header.
+  test("""
+*[AABC
+name:value
+""");
+
+  // Text after header.
+  test("""
+[AABC]*abcde
+""");
+
+  // Empty section name.
+  test("""
+[*]
+""");
+
+  // Duplicate section name.
+  test("""
+[AA]
+[BB]
+[*AA]
+""");
+
+  // Unrecognized section name.
+  test("""
+[*CC]
+""");
+
+  // Empty property name.
+  test("""
+[AA]
+*:value
+name:value
+""");
+
+  // Ok.
+  test(
+      """
+[AA]
+name:value
+[BB]
+name:value
+name2:value2
+""",
+      {
+    "AA": {"name": "value"},
+    "BB": {"name": "value", "name2": "value2"}
+  });
+
+  // Ok, file not ending in newline.
+  test(
+      """
+[AA]
+name:value""",
+      {
+    "A": {"name": "value"}
+  });
+
+  // Ok, whitespace is trimmed away.
+  test(
+      """
+[ AA ]
+ name\t:  value """,
+      {
+        "A": {"name": "value"}
+      });
+
+  // Duplicate property name.
+  test("""
+[AA]
+a:b
+b:c
+*a:c
+""");
+
+  // No ':' on property line.
+  test("""
+[AA]
+*name1
+name2:value
+""");
+}