Add special handling of the content type HTTP header

tests/standalone/io/http_headers_test.dart

Index: tests/standalone/io/http_headers_test.dart
diff --git a/tests/standalone/io/http_headers_test.dart b/tests/standalone/io/http_headers_test.dart
index 980c7c610cdd4f3a73a4da71c0550d52d8788ba2..97e7a88e5f0481fa2034dff222d3b431257d4556 100644
--- a/tests/standalone/io/http_headers_test.dart
+++ b/tests/standalone/io/http_headers_test.dart
@@ -165,9 +165,120 @@ void testEnumeration() {
   Expect.equals(3, totalValues);
 }
 
+void testHeaderValue() {
+  void check(HeaderValue headerValue, String value, [Map parameters]) {
+    Expect.equals(value, headerValue.value);
+    if (parameters != null) {
+      Expect.equals(parameters.length, headerValue.parameters.length);
+      parameters.forEach((String name, String value) {
+        Expect.equals(value, headerValue.parameters[name]);
+      });
+    } else {
+      Expect.equals(0, headerValue.parameters.length);
+    }
+  }
+
+  HeaderValue headerValue;
+  headerValue = new HeaderValue.fromString(
+      "xxx; aaa=bbb; ccc=\"\\\";\\a\"; ddd=\"    \"");
+  check(headerValue, "xxx", {"aaa": "bbb", "ccc": '\";a', "ddd": "    "});
+  headerValue = new HeaderValue.fromString(
+    "attachment; filename=genome.jpeg;"
+    "modification-date=\"Wed, 12 February 1997 16:29:51 -0500\"");
+  var parameters = {
+      "filename": "genome.jpeg",
+      "modification-date": "Wed, 12 February 1997 16:29:51 -0500"
+  };
+  check(headerValue, "attachment", parameters);
+  headerValue = new HeaderValue.fromString(
+    "  attachment  ;filename=genome.jpeg  ;"
+    "modification-date = \"Wed, 12 February 1997 16:29:51 -0500\""  );
+  check(headerValue, "attachment", parameters);
+}
+
+void testContentType() {
+  void check(ContentType contentType,
+             String primaryType,
+             String subType,
+             [Map parameters]) {
+    Expect.equals(primaryType, contentType.primaryType);
+    Expect.equals(subType, contentType.subType);
+    Expect.equals("$primaryType/$subType", contentType.value);
+    if (parameters != null) {
+      Expect.equals(parameters.length, contentType.parameters.length);
+      parameters.forEach((String name, String value) {
+        Expect.equals(value, contentType.parameters[name]);
+      });
+    } else {
+      Expect.equals(0, contentType.parameters.length);
+    }
+  }
+
+  _ContentType contentType;
+  contentType = new _ContentType();
+  Expect.equals("", contentType.primaryType);
+  Expect.equals("", contentType.subType);
+  Expect.equals("/", contentType.value);
+  contentType.value = "text/html";
+  Expect.equals("text", contentType.primaryType);
+  Expect.equals("html", contentType.subType);
+  Expect.equals("text/html", contentType.value);
+
+  contentType = new _ContentType.fromString("text/html");
+  check(contentType, "text", "html");
+  Expect.equals("text/html", contentType.toString());
+  contentType.parameters["charset"] = "utf-8";
+  check(contentType, "text", "html", {"charset": "utf-8"});
+  Expect.equals("text/html; charset=utf-8", contentType.toString());
+  contentType.parameters["xxx"] = "yyy";
+  check(contentType, "text", "html", {"charset": "utf-8", "xxx": "yyy"});
+  Expect.equals("text/html; charset=utf-8; xxx=yyy", contentType.toString());
+
+  contentType = new _ContentType.fromString("text/html");
+  check(contentType, "text", "html");
+  contentType = new _ContentType.fromString(" text/html  ");
+  check(contentType, "text", "html");
+  contentType = new _ContentType.fromString("text/html; charset=utf-8");
+  check(contentType, "text", "html", {"charset": "utf-8"});
+  contentType = new _ContentType.fromString(
+      "  text/html  ;  charset  =  utf-8  ");
+  check(contentType, "text", "html", {"charset": "utf-8"});
+  contentType = new _ContentType.fromString(
+      "text/html; charset=utf-8; xxx=yyy");
+  check(contentType, "text", "html", {"charset": "utf-8", "xxx": "yyy"});
+  contentType = new _ContentType.fromString(
+      "  text/html  ;  charset  =  utf-8  ;  xxx=yyy  ");
+  check(contentType, "text", "html", {"charset": "utf-8", "xxx": "yyy"});
+  contentType = new _ContentType.fromString(
+      'text/html; charset=utf-8; xxx="yyy"');
+  check(contentType, "text", "html", {"charset": "utf-8", "xxx": "yyy"});
+  contentType = new _ContentType.fromString(
+      "  text/html  ;  charset  =  utf-8  ;  xxx=yyy  ");
+  check(contentType, "text", "html", {"charset": "utf-8", "xxx": "yyy"});
+}
+
+void testContentTypeCache() {
+  _HttpHeaders headers = new _HttpHeaders();
+  headers.set(HttpHeaders.CONTENT_TYPE, "text/html");
+  Expect.equals("text", headers.contentType.primaryType);
+  Expect.equals("html", headers.contentType.subType);
+  Expect.equals("text/html", headers.contentType.value);
+  headers.set(HttpHeaders.CONTENT_TYPE, "text/plain; charset=utf-8");
+  Expect.equals("text", headers.contentType.primaryType);
+  Expect.equals("plain", headers.contentType.subType);
+  Expect.equals("text/plain", headers.contentType.value);
+  headers.removeAll(HttpHeaders.CONTENT_TYPE);
+  Expect.equals("", headers.contentType.primaryType);
+  Expect.equals("", headers.contentType.subType);
+  Expect.equals("/", headers.contentType.value);
+}
+
 main() {
   testMultiValue();
   testExpires();
   testHost();
   testEnumeration();
+  testHeaderValue();
+  testContentType();
+  testContentTypeCache();
 }