First cut at new layout
diff --git a/src/ProtocolBuffers.Test/TextFormatTest.cs b/src/ProtocolBuffers.Test/TextFormatTest.cs
new file mode 100644
index 0000000..8d30b96
--- /dev/null
+++ b/src/ProtocolBuffers.Test/TextFormatTest.cs
@@ -0,0 +1,487 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.
+// http://code.google.com/p/protobuf/
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+using System;
+using System.IO;
+using System.Text;
+using Google.ProtocolBuffers.TestProtos;
+using NUnit.Framework;
+
+namespace Google.ProtocolBuffers {
+  [TestFixture]
+  public class TextFormatTest {
+
+    private static readonly string AllFieldsSetText = TestUtil.ReadTextFromFile("text_format_unittest_data.txt");
+    private static readonly string AllExtensionsSetText = TestUtil.ReadTextFromFile("text_format_unittest_extensions_data.txt");
+
+    /// <summary>
+    /// Note that this is slightly different to the Java - 123.0 becomes 123, and 1.23E17 becomes 1.23E+17.
+    /// Both of these differences can be parsed by the Java and the C++, and we can parse their output too.
+    /// </summary>
+    private const string ExoticText =
+      "repeated_int32: -1\n" +
+      "repeated_int32: -2147483648\n" +
+      "repeated_int64: -1\n" +
+      "repeated_int64: -9223372036854775808\n" +
+      "repeated_uint32: 4294967295\n" +
+      "repeated_uint32: 2147483648\n" +
+      "repeated_uint64: 18446744073709551615\n" +
+      "repeated_uint64: 9223372036854775808\n" +
+      "repeated_double: 123\n" +
+      "repeated_double: 123.5\n" +
+      "repeated_double: 0.125\n" +
+      "repeated_double: 1.23E+17\n" +
+      "repeated_double: 1.235E+22\n" +
+      "repeated_double: 1.235E-18\n" +
+      "repeated_double: 123.456789\n" +
+      "repeated_double: Infinity\n" +
+      "repeated_double: -Infinity\n" +
+      "repeated_double: NaN\n" +
+      "repeated_string: \"\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\"" +
+        "\\341\\210\\264\"\n" +
+      "repeated_bytes: \"\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\"\\376\"\n";
+
+    private const string MessageSetText =
+      "[protobuf_unittest.TestMessageSetExtension1] {\n" +
+      "  i: 123\n" +
+      "}\n" +
+      "[protobuf_unittest.TestMessageSetExtension2] {\n" +
+      "  str: \"foo\"\n" +
+      "}\n";
+    
+    /// <summary>
+    /// Print TestAllTypes and compare with golden file. 
+    /// </summary>
+    [Test]
+    public void PrintMessage() {
+      string text = TextFormat.PrintToString(TestUtil.GetAllSet());
+      Assert.AreEqual(AllFieldsSetText.Replace("\r\n", "\n"), text.Replace("\r\n", "\n"));
+    }
+
+    /// <summary>
+    /// Print TestAllExtensions and compare with golden file.
+    /// </summary>
+    [Test]
+    public void PrintExtensions() {
+      string text = TextFormat.PrintToString(TestUtil.GetAllExtensionsSet());
+
+      Assert.AreEqual(AllExtensionsSetText.Replace("\r\n", "\n"), text.Replace("\r\n", "\n"));
+    }
+
+    /// <summary>
+    /// Test printing of unknown fields in a message.
+    /// </summary>
+    [Test]
+    public void PrintUnknownFields() {
+      TestEmptyMessage message =
+        TestEmptyMessage.CreateBuilder()
+          .SetUnknownFields(
+            UnknownFieldSet.CreateBuilder()
+              .AddField(5,
+                UnknownField.CreateBuilder()
+                  .AddVarint(1)
+                  .AddFixed32(2)
+                  .AddFixed64(3)
+                  .AddLengthDelimited(ByteString.CopyFromUtf8("4"))
+                  .AddGroup(
+                    UnknownFieldSet.CreateBuilder()
+                      .AddField(10,
+                        UnknownField.CreateBuilder()
+                          .AddVarint(5)
+                          .Build())
+                      .Build())
+                  .Build())
+              .AddField(8,
+                UnknownField.CreateBuilder()
+                  .AddVarint(1)
+                  .AddVarint(2)
+                  .AddVarint(3)
+                  .Build())
+              .AddField(15,
+                UnknownField.CreateBuilder()
+                  .AddVarint(0xABCDEF1234567890L)
+                  .AddFixed32(0xABCD1234)
+                  .AddFixed64(0xABCDEF1234567890L)
+                  .Build())
+              .Build())
+          .Build();
+
+      Assert.AreEqual(
+        "5: 1\n" +
+        "5: 0x00000002\n" +
+        "5: 0x0000000000000003\n" +
+        "5: \"4\"\n" +
+        "5 {\n" +
+        "  10: 5\n" +
+        "}\n" +
+        "8: 1\n" +
+        "8: 2\n" +
+        "8: 3\n" +
+        "15: 12379813812177893520\n" +
+        "15: 0xabcd1234\n" +
+        "15: 0xabcdef1234567890\n",
+        TextFormat.PrintToString(message));
+    }
+
+    /// <summary>
+    /// Helper to construct a ByteString from a string containing only 8-bit
+    /// characters. The characters are converted directly to bytes, *not*
+    /// encoded using UTF-8.
+    /// </summary>
+    private static ByteString Bytes(string str) {
+      return ByteString.CopyFrom(Encoding.GetEncoding(28591).GetBytes(str));
+    }   
+
+    [Test]
+    public void PrintExotic() {
+      IMessage message = TestAllTypes.CreateBuilder()
+        // Signed vs. unsigned numbers.
+        .AddRepeatedInt32 (-1)
+        .AddRepeatedUint32(uint.MaxValue)
+        .AddRepeatedInt64 (-1)
+        .AddRepeatedUint64(ulong.MaxValue)
+
+        .AddRepeatedInt32 (1  << 31)
+        .AddRepeatedUint32(1U  << 31)
+        .AddRepeatedInt64 (1L << 63)
+        .AddRepeatedUint64(1UL << 63)
+
+        // Floats of various precisions and exponents.
+        .AddRepeatedDouble(123)
+        .AddRepeatedDouble(123.5)
+        .AddRepeatedDouble(0.125)
+        .AddRepeatedDouble(123e15)
+        .AddRepeatedDouble(123.5e20)
+        .AddRepeatedDouble(123.5e-20)
+        .AddRepeatedDouble(123.456789)
+        .AddRepeatedDouble(Double.PositiveInfinity)
+        .AddRepeatedDouble(Double.NegativeInfinity)
+        .AddRepeatedDouble(Double.NaN)
+
+        // Strings and bytes that needing escaping.
+        .AddRepeatedString("\0\u0001\u0007\b\f\n\r\t\v\\\'\"\u1234")
+        .AddRepeatedBytes(Bytes("\0\u0001\u0007\b\f\n\r\t\v\\\'\"\u00fe"))
+        .Build();
+
+      Assert.AreEqual(ExoticText, message.ToString());
+    }
+
+    [Test]
+    public void PrintMessageSet() {
+      TestMessageSet messageSet =
+        TestMessageSet.CreateBuilder()
+          .SetExtension(
+            TestMessageSetExtension1.MessageSetExtension,
+            TestMessageSetExtension1.CreateBuilder().SetI(123).Build())
+          .SetExtension(
+            TestMessageSetExtension2.MessageSetExtension,
+            TestMessageSetExtension2.CreateBuilder().SetStr("foo").Build())
+          .Build();
+
+      Assert.AreEqual(MessageSetText, messageSet.ToString());
+    }
+
+    // =================================================================
+
+    [Test]
+    public void Parse() {
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      TextFormat.Merge(AllFieldsSetText, builder);
+      TestUtil.AssertAllFieldsSet(builder.Build());
+    }
+
+    [Test]
+    public void ParseReader() {
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      TextFormat.Merge(new StringReader(AllFieldsSetText), builder);
+      TestUtil.AssertAllFieldsSet(builder.Build());
+    }
+
+    [Test]
+    public void ParseExtensions() {
+      TestAllExtensions.Builder builder = TestAllExtensions.CreateBuilder();
+      TextFormat.Merge(AllExtensionsSetText,
+                       TestUtil.CreateExtensionRegistry(),
+                       builder);
+      TestUtil.AssertAllExtensionsSet(builder.Build());
+    }
+
+    [Test]
+    public void ParseCompatibility() {
+      string original = "repeated_float: inf\n" +
+                        "repeated_float: -inf\n" +
+                        "repeated_float: nan\n" +
+                        "repeated_float: inff\n" +
+                        "repeated_float: -inff\n" +
+                        "repeated_float: nanf\n" +
+                        "repeated_float: 1.0f\n" +
+                        "repeated_float: infinityf\n" +
+                        "repeated_float: -Infinityf\n" +
+                        "repeated_double: infinity\n" +
+                        "repeated_double: -infinity\n" +
+                        "repeated_double: nan\n";
+      string canonical = "repeated_float: Infinity\n" +
+                          "repeated_float: -Infinity\n" +
+                          "repeated_float: NaN\n" +
+                          "repeated_float: Infinity\n" +
+                          "repeated_float: -Infinity\n" +
+                          "repeated_float: NaN\n" +
+                          "repeated_float: 1\n" + // Java has 1.0; this is fine
+                          "repeated_float: Infinity\n" +
+                          "repeated_float: -Infinity\n" +
+                          "repeated_double: Infinity\n" +
+                          "repeated_double: -Infinity\n" +
+                          "repeated_double: NaN\n";
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      TextFormat.Merge(original, builder);
+      Assert.AreEqual(canonical, builder.Build().ToString());
+    }
+
+    [Test]
+    public void ParseExotic() {
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      TextFormat.Merge(ExoticText, builder);
+
+      // Too lazy to check things individually.  Don't try to debug this
+      // if testPrintExotic() is Assert.Failing.
+      Assert.AreEqual(ExoticText, builder.Build().ToString());
+    }
+
+    [Test]
+    public void ParseMessageSet() {
+      ExtensionRegistry extensionRegistry = ExtensionRegistry.CreateInstance();
+      extensionRegistry.Add(TestMessageSetExtension1.MessageSetExtension);
+      extensionRegistry.Add(TestMessageSetExtension2.MessageSetExtension);
+
+      TestMessageSet.Builder builder = TestMessageSet.CreateBuilder();
+      TextFormat.Merge(MessageSetText, extensionRegistry, builder);
+      TestMessageSet messageSet = builder.Build();
+
+      Assert.IsTrue(messageSet.HasExtension(TestMessageSetExtension1.MessageSetExtension));
+      Assert.AreEqual(123, messageSet.GetExtension(TestMessageSetExtension1.MessageSetExtension).I);
+      Assert.IsTrue(messageSet.HasExtension(TestMessageSetExtension2.MessageSetExtension));
+      Assert.AreEqual("foo", messageSet.GetExtension(TestMessageSetExtension2.MessageSetExtension).Str);
+    }
+
+    [Test]
+    public void ParseNumericEnum() {
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      TextFormat.Merge("optional_nested_enum: 2", builder);
+      Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAR, builder.OptionalNestedEnum);
+    }
+
+    [Test]
+    public void ParseAngleBrackets() {
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      TextFormat.Merge("OptionalGroup: < a: 1 >", builder);
+      Assert.IsTrue(builder.HasOptionalGroup);
+      Assert.AreEqual(1, builder.OptionalGroup.A);
+    }
+
+    [Test]
+    public void ParseComment() {
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      TextFormat.Merge(
+        "# this is a comment\n" +
+        "optional_int32: 1  # another comment\n" +
+        "optional_int64: 2\n" +
+        "# EOF comment", builder);
+      Assert.AreEqual(1, builder.OptionalInt32);
+      Assert.AreEqual(2, builder.OptionalInt64);
+    }
+
+
+    private static void AssertParseError(string error, string text) {
+      TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+      try {
+        TextFormat.Merge(text, TestUtil.CreateExtensionRegistry(), builder);
+        Assert.Fail("Expected parse exception.");
+      } catch (FormatException e) {
+        Assert.AreEqual(error, e.Message);
+      }
+    }
+
+    [Test]
+    public void ParseErrors() {
+      AssertParseError(
+        "1:16: Expected \":\".",
+        "optional_int32 123");
+      AssertParseError(
+        "1:23: Expected identifier.",
+        "optional_nested_enum: ?");
+      AssertParseError(
+        "1:18: Couldn't parse integer: Number must be positive: -1",
+        "optional_uint32: -1");
+      AssertParseError(
+        "1:17: Couldn't parse integer: Number out of range for 32-bit signed " +
+          "integer: 82301481290849012385230157",
+        "optional_int32: 82301481290849012385230157");
+      AssertParseError(
+        "1:16: Expected \"true\" or \"false\".",
+        "optional_bool: maybe");
+      AssertParseError(
+        "1:18: Expected string.",
+        "optional_string: 123");
+      AssertParseError(
+        "1:18: String missing ending quote.",
+        "optional_string: \"ueoauaoe");
+      AssertParseError(
+        "1:18: String missing ending quote.",
+        "optional_string: \"ueoauaoe\n" +
+        "optional_int32: 123");
+      AssertParseError(
+        "1:18: Invalid escape sequence: '\\z'",
+        "optional_string: \"\\z\"");
+      AssertParseError(
+        "1:18: String missing ending quote.",
+        "optional_string: \"ueoauaoe\n" +
+        "optional_int32: 123");
+      AssertParseError(
+        "1:2: Extension \"nosuchext\" not found in the ExtensionRegistry.",
+        "[nosuchext]: 123");
+      AssertParseError(
+        "1:20: Extension \"protobuf_unittest.optional_int32_extension\" does " +
+          "not extend message type \"protobuf_unittest.TestAllTypes\".",
+        "[protobuf_unittest.optional_int32_extension]: 123");
+      AssertParseError(
+        "1:1: Message type \"protobuf_unittest.TestAllTypes\" has no field " +
+          "named \"nosuchfield\".",
+        "nosuchfield: 123");
+      AssertParseError(
+        "1:21: Expected \">\".",
+        "OptionalGroup < a: 1");
+      AssertParseError(
+        "1:23: Enum type \"protobuf_unittest.TestAllTypes.NestedEnum\" has no " +
+          "value named \"NO_SUCH_VALUE\".",
+        "optional_nested_enum: NO_SUCH_VALUE");
+      AssertParseError(
+        "1:23: Enum type \"protobuf_unittest.TestAllTypes.NestedEnum\" has no " +
+          "value with number 123.",
+        "optional_nested_enum: 123");
+
+      // Delimiters must match.
+      AssertParseError(
+        "1:22: Expected identifier.",
+        "OptionalGroup < a: 1 }");
+      AssertParseError(
+        "1:22: Expected identifier.",
+        "OptionalGroup { a: 1 >");
+    }
+
+    // =================================================================
+
+    private static ByteString Bytes(params byte[] bytes) {
+      return ByteString.CopyFrom(bytes);
+    }
+
+    private delegate void FormattingAction();
+
+    private static void AssertFormatException(FormattingAction action) {
+      try {
+        action();
+        Assert.Fail("Should have thrown an exception.");
+      } catch (FormatException) {
+        // success
+      }
+    }
+
+    [Test]
+    public void Escape() {
+      // Escape sequences.
+      Assert.AreEqual("\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\"",
+        TextFormat.EscapeBytes(Bytes("\0\u0001\u0007\b\f\n\r\t\v\\\'\"")));
+      Assert.AreEqual("\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\"",
+        TextFormat.EscapeText("\0\u0001\u0007\b\f\n\r\t\v\\\'\""));
+      Assert.AreEqual(Bytes("\0\u0001\u0007\b\f\n\r\t\v\\\'\""),
+        TextFormat.UnescapeBytes("\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\""));
+      Assert.AreEqual("\0\u0001\u0007\b\f\n\r\t\v\\\'\"",
+        TextFormat.UnescapeText("\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\""));
+
+      // Unicode handling.
+      Assert.AreEqual("\\341\\210\\264", TextFormat.EscapeText("\u1234"));
+      Assert.AreEqual("\\341\\210\\264", TextFormat.EscapeBytes(Bytes(0xe1, 0x88, 0xb4)));
+      Assert.AreEqual("\u1234", TextFormat.UnescapeText("\\341\\210\\264"));
+      Assert.AreEqual(Bytes(0xe1, 0x88, 0xb4), TextFormat.UnescapeBytes("\\341\\210\\264"));
+      Assert.AreEqual("\u1234", TextFormat.UnescapeText("\\xe1\\x88\\xb4"));
+      Assert.AreEqual(Bytes(0xe1, 0x88, 0xb4), TextFormat.UnescapeBytes("\\xe1\\x88\\xb4"));
+
+      // Errors.
+      AssertFormatException(() => TextFormat.UnescapeText("\\x"));
+      AssertFormatException(() => TextFormat.UnescapeText("\\z"));
+      AssertFormatException(() => TextFormat.UnescapeText("\\"));
+    }
+
+    [Test]
+    public void ParseInteger() {
+      Assert.AreEqual(          0, TextFormat.ParseInt32(          "0"));
+      Assert.AreEqual(          1, TextFormat.ParseInt32(          "1"));
+      Assert.AreEqual(         -1, TextFormat.ParseInt32(         "-1"));
+      Assert.AreEqual(      12345, TextFormat.ParseInt32(      "12345"));
+      Assert.AreEqual(     -12345, TextFormat.ParseInt32(     "-12345"));
+      Assert.AreEqual( 2147483647, TextFormat.ParseInt32( "2147483647"));
+      Assert.AreEqual(-2147483648, TextFormat.ParseInt32("-2147483648"));
+
+      Assert.AreEqual(          0, TextFormat.ParseUInt32(         "0"));
+      Assert.AreEqual(          1, TextFormat.ParseUInt32(         "1"));
+      Assert.AreEqual(      12345, TextFormat.ParseUInt32(     "12345"));
+      Assert.AreEqual( 2147483647, TextFormat.ParseUInt32("2147483647"));
+      Assert.AreEqual(2147483648U, TextFormat.ParseUInt32("2147483648"));
+      Assert.AreEqual(4294967295U, TextFormat.ParseUInt32("4294967295"));
+
+      Assert.AreEqual(          0L, TextFormat.ParseInt64(          "0"));
+      Assert.AreEqual(          1L, TextFormat.ParseInt64(          "1"));
+      Assert.AreEqual(         -1L, TextFormat.ParseInt64(         "-1"));
+      Assert.AreEqual(      12345L, TextFormat.ParseInt64(      "12345"));
+      Assert.AreEqual(     -12345L, TextFormat.ParseInt64(     "-12345"));
+      Assert.AreEqual( 2147483647L, TextFormat.ParseInt64( "2147483647"));
+      Assert.AreEqual(-2147483648L, TextFormat.ParseInt64("-2147483648"));
+      Assert.AreEqual( 4294967295L, TextFormat.ParseInt64( "4294967295"));
+      Assert.AreEqual( 4294967296L, TextFormat.ParseInt64( "4294967296"));
+      Assert.AreEqual(9223372036854775807L, TextFormat.ParseInt64("9223372036854775807"));
+      Assert.AreEqual(-9223372036854775808L, TextFormat.ParseInt64("-9223372036854775808"));
+
+      Assert.AreEqual(          0L, TextFormat.ParseUInt64(          "0"));
+      Assert.AreEqual(          1L, TextFormat.ParseUInt64(          "1"));
+      Assert.AreEqual(      12345L, TextFormat.ParseUInt64(      "12345"));
+      Assert.AreEqual( 2147483647L, TextFormat.ParseUInt64( "2147483647"));
+      Assert.AreEqual( 4294967295L, TextFormat.ParseUInt64( "4294967295"));
+      Assert.AreEqual( 4294967296L, TextFormat.ParseUInt64( "4294967296"));
+      Assert.AreEqual(9223372036854775807UL, TextFormat.ParseUInt64("9223372036854775807"));
+      Assert.AreEqual(9223372036854775808UL, TextFormat.ParseUInt64("9223372036854775808"));
+      Assert.AreEqual(18446744073709551615UL, TextFormat.ParseUInt64("18446744073709551615"));
+
+      // Hex
+      Assert.AreEqual(0x1234abcd, TextFormat.ParseInt32("0x1234abcd"));
+      Assert.AreEqual(-0x1234abcd, TextFormat.ParseInt32("-0x1234abcd"));
+      Assert.AreEqual(0xffffffffffffffffUL, TextFormat.ParseUInt64("0xffffffffffffffff"));
+      Assert.AreEqual(0x7fffffffffffffffL,
+                   TextFormat.ParseInt64("0x7fffffffffffffff"));
+
+      // Octal
+      Assert.AreEqual(342391, TextFormat.ParseInt32("01234567"));
+
+      // Out-of-range
+      AssertFormatException(() => TextFormat.ParseInt32("2147483648"));
+      AssertFormatException(() => TextFormat.ParseInt32("-2147483649"));
+      AssertFormatException(() => TextFormat.ParseUInt32("4294967296"));
+      AssertFormatException(() => TextFormat.ParseUInt32("-1"));
+      AssertFormatException(() => TextFormat.ParseInt64("9223372036854775808"));
+      AssertFormatException(() => TextFormat.ParseInt64("-9223372036854775809"));
+      AssertFormatException(() => TextFormat.ParseUInt64("18446744073709551616"));
+      AssertFormatException(() => TextFormat.ParseUInt64("-1"));
+      AssertFormatException(() => TextFormat.ParseInt32("abcd"));
+    }
+  }
+}