// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#include <memory>
#ifndef _SHARED_PTR_H
#include <google/protobuf/stubs/shared_ptr.h>
#endif
#include <vector>
#include <algorithm>
#include <map>

#include <google/protobuf/compiler/parser.h>

#include <google/protobuf/io/tokenizer.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/wire_format.h>
#include <google/protobuf/text_format.h>
#include <google/protobuf/unittest.pb.h>
#include <google/protobuf/unittest_custom_options.pb.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/stubs/substitute.h>
#include <google/protobuf/stubs/map_util.h>

#include <google/protobuf/testing/googletest.h>
#include <gtest/gtest.h>

namespace google {
namespace protobuf {
namespace compiler {

namespace {

class MockErrorCollector : public io::ErrorCollector {
 public:
  MockErrorCollector() {}
  ~MockErrorCollector() {}

  string text_;

  // implements ErrorCollector ---------------------------------------
  void AddError(int line, int column, const string& message) {
    strings::SubstituteAndAppend(&text_, "$0:$1: $2\n",
                                 line, column, message);
  }
};

class MockValidationErrorCollector : public DescriptorPool::ErrorCollector {
 public:
  MockValidationErrorCollector(const SourceLocationTable& source_locations,
                               io::ErrorCollector* wrapped_collector)
    : source_locations_(source_locations),
      wrapped_collector_(wrapped_collector) {}
  ~MockValidationErrorCollector() {}

  // implements ErrorCollector ---------------------------------------
  void AddError(const string& filename,
                const string& element_name,
                const Message* descriptor,
                ErrorLocation location,
                const string& message) {
    int line, column;
    source_locations_.Find(descriptor, location, &line, &column);
    wrapped_collector_->AddError(line, column, message);
  }

 private:
  const SourceLocationTable& source_locations_;
  io::ErrorCollector* wrapped_collector_;
};

class ParserTest : public testing::Test {
 protected:
  ParserTest()
    : require_syntax_identifier_(false) {}

  // Set up the parser to parse the given text.
  void SetupParser(const char* text) {
    raw_input_.reset(new io::ArrayInputStream(text, strlen(text)));
    input_.reset(new io::Tokenizer(raw_input_.get(), &error_collector_));
    parser_.reset(new Parser());
    parser_->RecordErrorsTo(&error_collector_);
    parser_->SetRequireSyntaxIdentifier(require_syntax_identifier_);
  }

  // Parse the input and expect that the resulting FileDescriptorProto matches
  // the given output.  The output is a FileDescriptorProto in protocol buffer
  // text format.
  void ExpectParsesTo(const char* input, const char* output) {
    SetupParser(input);
    FileDescriptorProto actual, expected;

    parser_->Parse(input_.get(), &actual);
    EXPECT_EQ(io::Tokenizer::TYPE_END, input_->current().type);
    ASSERT_EQ("", error_collector_.text_);

    // We don't cover SourceCodeInfo in these tests.
    actual.clear_source_code_info();

    // Parse the ASCII representation in order to canonicalize it.  We could
    // just compare directly to actual.DebugString(), but that would require
    // that the caller precisely match the formatting that DebugString()
    // produces.
    ASSERT_TRUE(TextFormat::ParseFromString(output, &expected));

    // Compare by comparing debug strings.
    // TODO(kenton):  Use differencer, once it is available.
    EXPECT_EQ(expected.DebugString(), actual.DebugString());
  }

  // Parse the text and expect that the given errors are reported.
  void ExpectHasErrors(const char* text, const char* expected_errors) {
    ExpectHasEarlyExitErrors(text, expected_errors);
    EXPECT_EQ(io::Tokenizer::TYPE_END, input_->current().type);
  }

  // Same as above but does not expect that the parser parses the complete
  // input.
  void ExpectHasEarlyExitErrors(const char* text, const char* expected_errors) {
    SetupParser(text);
    FileDescriptorProto file;
    parser_->Parse(input_.get(), &file);
    EXPECT_EQ(expected_errors, error_collector_.text_);
  }

  // Parse the text as a file and validate it (with a DescriptorPool), and
  // expect that the validation step reports the given errors.
  void ExpectHasValidationErrors(const char* text,
                                 const char* expected_errors) {
    SetupParser(text);
    SourceLocationTable source_locations;
    parser_->RecordSourceLocationsTo(&source_locations);

    FileDescriptorProto file;
    file.set_name("foo.proto");
    parser_->Parse(input_.get(), &file);
    EXPECT_EQ(io::Tokenizer::TYPE_END, input_->current().type);
    ASSERT_EQ("", error_collector_.text_);

    MockValidationErrorCollector validation_error_collector(
      source_locations, &error_collector_);
    EXPECT_TRUE(pool_.BuildFileCollectingErrors(
      file, &validation_error_collector) == NULL);
    EXPECT_EQ(expected_errors, error_collector_.text_);
  }

  MockErrorCollector error_collector_;
  DescriptorPool pool_;

  google::protobuf::scoped_ptr<io::ZeroCopyInputStream> raw_input_;
  google::protobuf::scoped_ptr<io::Tokenizer> input_;
  google::protobuf::scoped_ptr<Parser> parser_;
  bool require_syntax_identifier_;
};

// ===================================================================

TEST_F(ParserTest, StopAfterSyntaxIdentifier) {
  SetupParser(
    "// blah\n"
    "syntax = \"foobar\";\n"
    "this line will not be parsed\n");
  parser_->SetStopAfterSyntaxIdentifier(true);
  EXPECT_TRUE(parser_->Parse(input_.get(), NULL));
  EXPECT_EQ("", error_collector_.text_);
  EXPECT_EQ("foobar", parser_->GetSyntaxIdentifier());
}

TEST_F(ParserTest, StopAfterOmittedSyntaxIdentifier) {
  SetupParser(
    "// blah\n"
    "this line will not be parsed\n");
  parser_->SetStopAfterSyntaxIdentifier(true);
  EXPECT_TRUE(parser_->Parse(input_.get(), NULL));
  EXPECT_EQ("", error_collector_.text_);
  EXPECT_EQ("", parser_->GetSyntaxIdentifier());
}

TEST_F(ParserTest, StopAfterSyntaxIdentifierWithErrors) {
  SetupParser(
    "// blah\n"
    "syntax = error;\n");
  parser_->SetStopAfterSyntaxIdentifier(true);
  EXPECT_FALSE(parser_->Parse(input_.get(), NULL));
  EXPECT_EQ("1:9: Expected syntax identifier.\n", error_collector_.text_);
}

TEST_F(ParserTest, WarnIfSyntaxIdentifierOmmitted) {
  SetupParser("message A {}");
  FileDescriptorProto file;
  CaptureTestStderr();
  EXPECT_TRUE(parser_->Parse(input_.get(), &file));
  EXPECT_TRUE(
      GetCapturedTestStderr().find("No syntax specified") != string::npos);
}

// ===================================================================

typedef ParserTest ParseMessageTest;

TEST_F(ParseMessageTest, IgnoreBOM) {
  char input[] = "   message TestMessage {\n"
      "  required int32 foo = 1;\n"
      "}\n";
  // Set UTF-8 BOM.
  input[0] = (char)0xEF;
  input[1] = (char)0xBB;
  input[2] = (char)0xBF;
  ExpectParsesTo(input,
    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32 number:1 }"
    "}");
}

TEST_F(ParseMessageTest, BOMError) {
  char input[] = "   message TestMessage {\n"
      "  required int32 foo = 1;\n"
      "}\n";
  input[0] = (char)0xEF;
  ExpectHasErrors(input,
                  "0:1: Proto file starts with 0xEF but not UTF-8 BOM. "
                  "Only UTF-8 is accepted for proto file.\n"
                  "0:0: Expected top-level statement (e.g. \"message\").\n");
}

TEST_F(ParseMessageTest, SimpleMessage) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  required int32 foo = 1;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32 number:1 }"
    "}");
}

TEST_F(ParseMessageTest, ImplicitSyntaxIdentifier) {
  require_syntax_identifier_ = false;
  ExpectParsesTo(
    "message TestMessage {\n"
    "  required int32 foo = 1;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32 number:1 }"
    "}");
  EXPECT_EQ("proto2", parser_->GetSyntaxIdentifier());
}

TEST_F(ParseMessageTest, ExplicitSyntaxIdentifier) {
  ExpectParsesTo(
    "syntax = \"proto2\";\n"
    "message TestMessage {\n"
    "  required int32 foo = 1;\n"
    "}\n",

    "syntax: 'proto2' "
    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32 number:1 }"
    "}");
  EXPECT_EQ("proto2", parser_->GetSyntaxIdentifier());
}

TEST_F(ParseMessageTest, ExplicitRequiredSyntaxIdentifier) {
  require_syntax_identifier_ = true;
  ExpectParsesTo(
    "syntax = \"proto2\";\n"
    "message TestMessage {\n"
    "  required int32 foo = 1;\n"
    "}\n",

    "syntax: 'proto2' "
    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32 number:1 }"
    "}");
  EXPECT_EQ("proto2", parser_->GetSyntaxIdentifier());
}

TEST_F(ParseMessageTest, SimpleFields) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  required int32 foo = 15;\n"
    "  optional int32 bar = 34;\n"
    "  repeated int32 baz = 3;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32 number:15 }"
    "  field { name:\"bar\" label:LABEL_OPTIONAL type:TYPE_INT32 number:34 }"
    "  field { name:\"baz\" label:LABEL_REPEATED type:TYPE_INT32 number:3  }"
    "}");
}

TEST_F(ParseMessageTest, PrimitiveFieldTypes) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  required int32    foo = 1;\n"
    "  required int64    foo = 1;\n"
    "  required uint32   foo = 1;\n"
    "  required uint64   foo = 1;\n"
    "  required sint32   foo = 1;\n"
    "  required sint64   foo = 1;\n"
    "  required fixed32  foo = 1;\n"
    "  required fixed64  foo = 1;\n"
    "  required sfixed32 foo = 1;\n"
    "  required sfixed64 foo = 1;\n"
    "  required float    foo = 1;\n"
    "  required double   foo = 1;\n"
    "  required string   foo = 1;\n"
    "  required bytes    foo = 1;\n"
    "  required bool     foo = 1;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32    number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT64    number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_UINT32   number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_UINT64   number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_SINT32   number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_SINT64   number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_FIXED32  number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_FIXED64  number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_SFIXED32 number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_SFIXED64 number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_FLOAT    number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_DOUBLE   number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_STRING   number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_BYTES    number:1 }"
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_BOOL     number:1 }"
    "}");
}

TEST_F(ParseMessageTest, FieldDefaults) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  required int32  foo = 1 [default=  1  ];\n"
    "  required int32  foo = 1 [default= -2  ];\n"
    "  required int64  foo = 1 [default=  3  ];\n"
    "  required int64  foo = 1 [default= -4  ];\n"
    "  required uint32 foo = 1 [default=  5  ];\n"
    "  required uint64 foo = 1 [default=  6  ];\n"
    "  required float  foo = 1 [default=  7.5];\n"
    "  required float  foo = 1 [default= -8.5];\n"
    "  required float  foo = 1 [default=  9  ];\n"
    "  required double foo = 1 [default= 10.5];\n"
    "  required double foo = 1 [default=-11.5];\n"
    "  required double foo = 1 [default= 12  ];\n"
    "  required double foo = 1 [default= inf ];\n"
    "  required double foo = 1 [default=-inf ];\n"
    "  required double foo = 1 [default= nan ];\n"
    "  required string foo = 1 [default='13\\001'];\n"
    "  required string foo = 1 [default='a' \"b\" \n \"c\"];\n"
    "  required bytes  foo = 1 [default='14\\002'];\n"
    "  required bytes  foo = 1 [default='a' \"b\" \n 'c'];\n"
    "  required bool   foo = 1 [default=true ];\n"
    "  required Foo    foo = 1 [default=FOO  ];\n"

    "  required int32  foo = 1 [default= 0x7FFFFFFF];\n"
    "  required int32  foo = 1 [default=-0x80000000];\n"
    "  required uint32 foo = 1 [default= 0xFFFFFFFF];\n"
    "  required int64  foo = 1 [default= 0x7FFFFFFFFFFFFFFF];\n"
    "  required int64  foo = 1 [default=-0x8000000000000000];\n"
    "  required uint64 foo = 1 [default= 0xFFFFFFFFFFFFFFFF];\n"
    "  required double foo = 1 [default= 0xabcd];\n"
    "}\n",

#define ETC "name:\"foo\" label:LABEL_REQUIRED number:1"
    "message_type {"
    "  name: \"TestMessage\""
    "  field { type:TYPE_INT32   default_value:\"1\"         " ETC " }"
    "  field { type:TYPE_INT32   default_value:\"-2\"        " ETC " }"
    "  field { type:TYPE_INT64   default_value:\"3\"         " ETC " }"
    "  field { type:TYPE_INT64   default_value:\"-4\"        " ETC " }"
    "  field { type:TYPE_UINT32  default_value:\"5\"         " ETC " }"
    "  field { type:TYPE_UINT64  default_value:\"6\"         " ETC " }"
    "  field { type:TYPE_FLOAT   default_value:\"7.5\"       " ETC " }"
    "  field { type:TYPE_FLOAT   default_value:\"-8.5\"      " ETC " }"
    "  field { type:TYPE_FLOAT   default_value:\"9\"         " ETC " }"
    "  field { type:TYPE_DOUBLE  default_value:\"10.5\"      " ETC " }"
    "  field { type:TYPE_DOUBLE  default_value:\"-11.5\"     " ETC " }"
    "  field { type:TYPE_DOUBLE  default_value:\"12\"        " ETC " }"
    "  field { type:TYPE_DOUBLE  default_value:\"inf\"       " ETC " }"
    "  field { type:TYPE_DOUBLE  default_value:\"-inf\"      " ETC " }"
    "  field { type:TYPE_DOUBLE  default_value:\"nan\"       " ETC " }"
    "  field { type:TYPE_STRING  default_value:\"13\\001\"   " ETC " }"
    "  field { type:TYPE_STRING  default_value:\"abc\"       " ETC " }"
    "  field { type:TYPE_BYTES   default_value:\"14\\\\002\" " ETC " }"
    "  field { type:TYPE_BYTES   default_value:\"abc\"       " ETC " }"
    "  field { type:TYPE_BOOL    default_value:\"true\"      " ETC " }"
    "  field { type_name:\"Foo\" default_value:\"FOO\"       " ETC " }"

    "  field {"
    "    type:TYPE_INT32   default_value:\"2147483647\"           " ETC
    "  }"
    "  field {"
    "    type:TYPE_INT32   default_value:\"-2147483648\"          " ETC
    "  }"
    "  field {"
    "    type:TYPE_UINT32  default_value:\"4294967295\"           " ETC
    "  }"
    "  field {"
    "    type:TYPE_INT64   default_value:\"9223372036854775807\"  " ETC
    "  }"
    "  field {"
    "    type:TYPE_INT64   default_value:\"-9223372036854775808\" " ETC
    "  }"
    "  field {"
    "    type:TYPE_UINT64  default_value:\"18446744073709551615\" " ETC
    "  }"
    "  field {"
    "    type:TYPE_DOUBLE  default_value:\"43981\"                " ETC
    "  }"
    "}");
#undef ETC
}

TEST_F(ParseMessageTest, FieldJsonName) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  optional string foo = 1 [json_name = \"@type\"];\n"
    "}\n",
    "message_type {"
    "  name: \"TestMessage\""
    "  field {\n"
    "    name: \"foo\" label: LABEL_OPTIONAL type: TYPE_STRING number: 1"
    "    json_name: \"@type\"\n"
    "  }\n"
    "}\n");
}

TEST_F(ParseMessageTest, FieldOptions) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  optional string foo = 1\n"
    "      [ctype=CORD, (foo)=7, foo.(.bar.baz).qux.quux.(corge)=-33, \n"
    "       (quux)=\"x\040y\", (baz.qux)=hey];\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name: \"foo\" label: LABEL_OPTIONAL type: TYPE_STRING number: 1"
    "          options { uninterpreted_option: { name { name_part: \"ctype\" "
    "                                                   is_extension: false } "
    "                                            identifier_value: \"CORD\"  }"
    "                    uninterpreted_option: { name { name_part: \"foo\" "
    "                                                   is_extension: true } "
    "                                            positive_int_value: 7  }"
    "                    uninterpreted_option: { name { name_part: \"foo\" "
    "                                                   is_extension: false } "
    "                                            name { name_part: \".bar.baz\""
    "                                                   is_extension: true } "
    "                                            name { name_part: \"qux\" "
    "                                                   is_extension: false } "
    "                                            name { name_part: \"quux\" "
    "                                                   is_extension: false } "
    "                                            name { name_part: \"corge\" "
    "                                                   is_extension: true } "
    "                                            negative_int_value: -33 }"
    "                    uninterpreted_option: { name { name_part: \"quux\" "
    "                                                   is_extension: true } "
    "                                            string_value: \"x y\" }"
    "                    uninterpreted_option: { name { name_part: \"baz.qux\" "
    "                                                   is_extension: true } "
    "                                            identifier_value: \"hey\" }"
    "          }"
    "  }"
    "}");
}

TEST_F(ParseMessageTest, Oneof) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  oneof foo {\n"
    "    int32 a = 1;\n"
    "    string b = 2;\n"
    "    TestMessage c = 3;\n"
    "    group D = 4 { optional int32 i = 5; }\n"
    "  }\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"a\" label:LABEL_OPTIONAL type:TYPE_INT32 number:1 "
    "          oneof_index:0 }"
    "  field { name:\"b\" label:LABEL_OPTIONAL type:TYPE_STRING number:2 "
    "          oneof_index:0 }"
    "  field { name:\"c\" label:LABEL_OPTIONAL type_name:\"TestMessage\" "
    "          number:3 oneof_index:0 }"
    "  field { name:\"d\" label:LABEL_OPTIONAL type:TYPE_GROUP "
    "          type_name:\"D\" number:4 oneof_index:0 }"
    "  oneof_decl {"
    "    name: \"foo\""
    "  }"
    "  nested_type {"
    "    name: \"D\""
    "    field { name:\"i\" label:LABEL_OPTIONAL type:TYPE_INT32 number:5 }"
    "  }"
    "}");
}

TEST_F(ParseMessageTest, MultipleOneofs) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  oneof foo {\n"
    "    int32 a = 1;\n"
    "    string b = 2;\n"
    "  }\n"
    "  oneof bar {\n"
    "    int32 c = 3;\n"
    "    string d = 4;\n"
    "  }\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"a\" label:LABEL_OPTIONAL type:TYPE_INT32 number:1 "
    "          oneof_index:0 }"
    "  field { name:\"b\" label:LABEL_OPTIONAL type:TYPE_STRING number:2 "
    "          oneof_index:0 }"
    "  field { name:\"c\" label:LABEL_OPTIONAL type:TYPE_INT32 number:3 "
    "          oneof_index:1 }"
    "  field { name:\"d\" label:LABEL_OPTIONAL type:TYPE_STRING number:4 "
    "          oneof_index:1 }"
    "  oneof_decl {"
    "    name: \"foo\""
    "  }"
    "  oneof_decl {"
    "    name: \"bar\""
    "  }"
    "}");
}

TEST_F(ParseMessageTest, Maps) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  map<int32, string> primitive_type_map = 1;\n"
    "  map<KeyType, ValueType> composite_type_map = 2;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  nested_type {"
    "    name: \"PrimitiveTypeMapEntry\""
    "    field { "
    "       name: \"key\" number: 1 label:LABEL_OPTIONAL"
    "       type:TYPE_INT32"
    "    }"
    "    field { "
    "       name: \"value\" number: 2 label:LABEL_OPTIONAL"
    "       type:TYPE_STRING"
    "    }"
    "    options { map_entry: true }"
    "  }"
    "  nested_type {"
    "    name: \"CompositeTypeMapEntry\""
    "    field { "
    "       name: \"key\" number: 1 label:LABEL_OPTIONAL"
    "       type_name: \"KeyType\""
    "    }"
    "    field { "
    "       name: \"value\" number: 2 label:LABEL_OPTIONAL"
    "       type_name: \"ValueType\""
    "    }"
    "    options { map_entry: true }"
    "  }"
    "  field {"
    "    name: \"primitive_type_map\""
    "    label: LABEL_REPEATED"
    "    type_name: \"PrimitiveTypeMapEntry\""
    "    number: 1"
    "  }"
    "  field {"
    "    name: \"composite_type_map\""
    "    label: LABEL_REPEATED"
    "    type_name: \"CompositeTypeMapEntry\""
    "    number: 2"
    "  }"
    "}");
}

TEST_F(ParseMessageTest, Group) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  optional group TestGroup = 1 {};\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  nested_type { name: \"TestGroup\" }"
    "  field { name:\"testgroup\" label:LABEL_OPTIONAL number:1"
    "          type:TYPE_GROUP type_name: \"TestGroup\" }"
    "}");
}

TEST_F(ParseMessageTest, NestedMessage) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  message Nested {}\n"
    "  optional Nested test_nested = 1;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  nested_type { name: \"Nested\" }"
    "  field { name:\"test_nested\" label:LABEL_OPTIONAL number:1"
    "          type_name: \"Nested\" }"
    "}");
}

TEST_F(ParseMessageTest, NestedEnum) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  enum NestedEnum {}\n"
    "  optional NestedEnum test_enum = 1;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  enum_type { name: \"NestedEnum\" }"
    "  field { name:\"test_enum\" label:LABEL_OPTIONAL number:1"
    "          type_name: \"NestedEnum\" }"
    "}");
}

TEST_F(ParseMessageTest, ReservedRange) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  required int32 foo = 1;\n"
    "  reserved 2, 15, 9 to 11, 3;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_REQUIRED type:TYPE_INT32 number:1 }"
    "  reserved_range { start:2   end:3         }"
    "  reserved_range { start:15  end:16        }"
    "  reserved_range { start:9   end:12        }"
    "  reserved_range { start:3   end:4         }"
    "}");
}

TEST_F(ParseMessageTest, ReservedNames) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  reserved \"foo\", \"bar\";\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  reserved_name: \"foo\""
    "  reserved_name: \"bar\""
    "}");
}

TEST_F(ParseMessageTest, ExtensionRange) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  extensions 10 to 19;\n"
    "  extensions 30 to max;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  extension_range { start:10 end:20        }"
    "  extension_range { start:30 end:536870912 }"
    "}");
}

TEST_F(ParseMessageTest, CompoundExtensionRange) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  extensions 2, 15, 9 to 11, 100 to max, 3;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  extension_range { start:2   end:3         }"
    "  extension_range { start:15  end:16        }"
    "  extension_range { start:9   end:12        }"
    "  extension_range { start:100 end:536870912 }"
    "  extension_range { start:3   end:4         }"
    "}");
}

TEST_F(ParseMessageTest, LargerMaxForMessageSetWireFormatMessages) {
  // Messages using the message_set_wire_format option can accept larger
  // extension numbers, as the numbers are not encoded as int32 field values
  // rather than tags.
  ExpectParsesTo(
    "message TestMessage {\n"
    "  extensions 4 to max;\n"
    "  option message_set_wire_format = true;\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "    extension_range { start:4 end: 0x7fffffff }"
    "  options {\n"
    "    uninterpreted_option { \n"
    "      name {\n"
    "        name_part: \"message_set_wire_format\"\n"
    "        is_extension: false\n"
    "      }\n"
    "      identifier_value: \"true\"\n"
    "    }\n"
    "  }\n"
    "}");
}

TEST_F(ParseMessageTest, Extensions) {
  ExpectParsesTo(
    "extend Extendee1 { optional int32 foo = 12; }\n"
    "extend Extendee2 { repeated TestMessage bar = 22; }\n",

    "extension { name:\"foo\" label:LABEL_OPTIONAL type:TYPE_INT32 number:12"
    "            extendee: \"Extendee1\" } "
    "extension { name:\"bar\" label:LABEL_REPEATED number:22"
    "            type_name:\"TestMessage\" extendee: \"Extendee2\" }");
}

TEST_F(ParseMessageTest, ExtensionsInMessageScope) {
  ExpectParsesTo(
    "message TestMessage {\n"
    "  extend Extendee1 { optional int32 foo = 12; }\n"
    "  extend Extendee2 { repeated TestMessage bar = 22; }\n"
    "}\n",

    "message_type {"
    "  name: \"TestMessage\""
    "  extension { name:\"foo\" label:LABEL_OPTIONAL type:TYPE_INT32 number:12"
    "              extendee: \"Extendee1\" }"
    "  extension { name:\"bar\" label:LABEL_REPEATED number:22"
    "              type_name:\"TestMessage\" extendee: \"Extendee2\" }"
    "}");
}

TEST_F(ParseMessageTest, MultipleExtensionsOneExtendee) {
  ExpectParsesTo(
    "extend Extendee1 {\n"
    "  optional int32 foo = 12;\n"
    "  repeated TestMessage bar = 22;\n"
    "}\n",

    "extension { name:\"foo\" label:LABEL_OPTIONAL type:TYPE_INT32 number:12"
    "            extendee: \"Extendee1\" } "
    "extension { name:\"bar\" label:LABEL_REPEATED number:22"
    "            type_name:\"TestMessage\" extendee: \"Extendee1\" }");
}

TEST_F(ParseMessageTest, OptionalLabelProto3) {
  ExpectParsesTo(
    "syntax = \"proto3\";\n"
    "message TestMessage {\n"
    "  int32 foo = 1;\n"
    "}\n",

    "syntax: \"proto3\" "
    "message_type {"
    "  name: \"TestMessage\""
    "  field { name:\"foo\" label:LABEL_OPTIONAL type:TYPE_INT32 number:1 } }");
}

// ===================================================================

typedef ParserTest ParseEnumTest;

TEST_F(ParseEnumTest, SimpleEnum) {
  ExpectParsesTo(
    "enum TestEnum {\n"
    "  FOO = 0;\n"
    "}\n",

    "enum_type {"
    "  name: \"TestEnum\""
    "  value { name:\"FOO\" number:0 }"
    "}");
}

TEST_F(ParseEnumTest, Values) {
  ExpectParsesTo(
    "enum TestEnum {\n"
    "  FOO = 13;\n"
    "  BAR = -10;\n"
    "  BAZ = 500;\n"
    "  HEX_MAX = 0x7FFFFFFF;\n"
    "  HEX_MIN = -0x80000000;\n"
    "  INT_MAX = 2147483647;\n"
    "  INT_MIN = -2147483648;\n"
    "}\n",

    "enum_type {"
    "  name: \"TestEnum\""
    "  value { name:\"FOO\" number:13 }"
    "  value { name:\"BAR\" number:-10 }"
    "  value { name:\"BAZ\" number:500 }"
    "  value { name:\"HEX_MAX\" number:2147483647 }"
    "  value { name:\"HEX_MIN\" number:-2147483648 }"
    "  value { name:\"INT_MAX\" number:2147483647 }"
    "  value { name:\"INT_MIN\" number:-2147483648 }"
    "}");
}

TEST_F(ParseEnumTest, ValueOptions) {
  ExpectParsesTo(
    "enum TestEnum {\n"
    "  FOO = 13;\n"
    "  BAR = -10 [ (something.text) = 'abc' ];\n"
    "  BAZ = 500 [ (something.text) = 'def', other = 1 ];\n"
    "}\n",

    "enum_type {"
    "  name: \"TestEnum\""
    "  value { name: \"FOO\" number: 13 }"
    "  value { name: \"BAR\" number: -10 "
    "    options { "
    "      uninterpreted_option { "
    "        name { name_part: \"something.text\" is_extension: true } "
    "        string_value: \"abc\" "
    "      } "
    "    } "
    "  } "
    "  value { name: \"BAZ\" number: 500 "
    "    options { "
    "      uninterpreted_option { "
    "        name { name_part: \"something.text\" is_extension: true } "
    "        string_value: \"def\" "
    "      } "
    "      uninterpreted_option { "
    "        name { name_part: \"other\" is_extension: false } "
    "        positive_int_value: 1 "
    "      } "
    "    } "
    "  } "
    "}");
}

// ===================================================================

typedef ParserTest ParseServiceTest;

TEST_F(ParseServiceTest, SimpleService) {
  ExpectParsesTo(
    "service TestService {\n"
    "  rpc Foo(In) returns (Out);\n"
    "}\n",

    "service {"
    "  name: \"TestService\""
    "  method { name:\"Foo\" input_type:\"In\" output_type:\"Out\" }"
    "}");
}

TEST_F(ParseServiceTest, MethodsAndStreams) {
  ExpectParsesTo(
    "service TestService {\n"
    "  rpc Foo(In1) returns (Out1);\n"
    "  rpc Bar(In2) returns (Out2);\n"
    "  rpc Baz(In3) returns (Out3);\n"
    "}\n",

    "service {"
    "  name: \"TestService\""
    "  method { name:\"Foo\" input_type:\"In1\" output_type:\"Out1\" }"
    "  method { name:\"Bar\" input_type:\"In2\" output_type:\"Out2\" }"
    "  method { name:\"Baz\" input_type:\"In3\" output_type:\"Out3\" }"
    "}");
}


// ===================================================================
// imports and packages

typedef ParserTest ParseMiscTest;

TEST_F(ParseMiscTest, ParseImport) {
  ExpectParsesTo(
    "import \"foo/bar/baz.proto\";\n",
    "dependency: \"foo/bar/baz.proto\"");
}

TEST_F(ParseMiscTest, ParseMultipleImports) {
  ExpectParsesTo(
    "import \"foo.proto\";\n"
    "import \"bar.proto\";\n"
    "import \"baz.proto\";\n",
    "dependency: \"foo.proto\""
    "dependency: \"bar.proto\""
    "dependency: \"baz.proto\"");
}

TEST_F(ParseMiscTest, ParsePublicImports) {
  ExpectParsesTo(
    "import \"foo.proto\";\n"
    "import public \"bar.proto\";\n"
    "import \"baz.proto\";\n"
    "import public \"qux.proto\";\n",
    "dependency: \"foo.proto\""
    "dependency: \"bar.proto\""
    "dependency: \"baz.proto\""
    "dependency: \"qux.proto\""
    "public_dependency: 1 "
    "public_dependency: 3 ");
}

TEST_F(ParseMiscTest, ParsePackage) {
  ExpectParsesTo(
    "package foo.bar.baz;\n",
    "package: \"foo.bar.baz\"");
}

TEST_F(ParseMiscTest, ParsePackageWithSpaces) {
  ExpectParsesTo(
    "package foo   .   bar.  \n"
    "  baz;\n",
    "package: \"foo.bar.baz\"");
}

// ===================================================================
// options

TEST_F(ParseMiscTest, ParseFileOptions) {
  ExpectParsesTo(
    "option java_package = \"com.google.foo\";\n"
    "option optimize_for = CODE_SIZE;",

    "options {"
    "uninterpreted_option { name { name_part: \"java_package\" "
    "                              is_extension: false }"
    "                       string_value: \"com.google.foo\"} "
    "uninterpreted_option { name { name_part: \"optimize_for\" "
    "                              is_extension: false }"
    "                       identifier_value: \"CODE_SIZE\" } "
    "}");
}

// ===================================================================
// Error tests
//
// There are a very large number of possible errors that the parser could
// report, so it's infeasible to test every single one of them.  Instead,
// we test each unique call to AddError() in parser.h.  This does not mean
// we are testing every possible error that Parser can generate because
// each variant of the Consume() helper only counts as one unique call to
// AddError().

typedef ParserTest ParseErrorTest;

TEST_F(ParseErrorTest, MissingSyntaxIdentifier) {
  require_syntax_identifier_ = true;
  ExpectHasEarlyExitErrors("message TestMessage {}",
                           "0:0: File must begin with a syntax statement, e.g. "
                           "'syntax = \"proto2\";'.\n");
  EXPECT_EQ("", parser_->GetSyntaxIdentifier());
}

TEST_F(ParseErrorTest, UnknownSyntaxIdentifier) {
  ExpectHasEarlyExitErrors(
    "syntax = \"no_such_syntax\";",
    "0:9: Unrecognized syntax identifier \"no_such_syntax\".  This parser "
      "only recognizes \"proto2\" and \"proto3\".\n");
  EXPECT_EQ("no_such_syntax", parser_->GetSyntaxIdentifier());
}

TEST_F(ParseErrorTest, SimpleSyntaxError) {
  ExpectHasErrors(
    "message TestMessage @#$ { blah }",
    "0:20: Expected \"{\".\n");
  EXPECT_EQ("proto2", parser_->GetSyntaxIdentifier());
}

TEST_F(ParseErrorTest, ExpectedTopLevel) {
  ExpectHasErrors(
    "blah;",
    "0:0: Expected top-level statement (e.g. \"message\").\n");
}

TEST_F(ParseErrorTest, UnmatchedCloseBrace) {
  // This used to cause an infinite loop.  Doh.
  ExpectHasErrors(
    "}",
    "0:0: Expected top-level statement (e.g. \"message\").\n"
    "0:0: Unmatched \"}\".\n");
}

// -------------------------------------------------------------------
// Message errors

TEST_F(ParseErrorTest, MessageMissingName) {
  ExpectHasErrors(
    "message {}",
    "0:8: Expected message name.\n");
}

TEST_F(ParseErrorTest, MessageMissingBody) {
  ExpectHasErrors(
    "message TestMessage;",
    "0:19: Expected \"{\".\n");
}

TEST_F(ParseErrorTest, EofInMessage) {
  ExpectHasErrors(
    "message TestMessage {",
    "0:21: Reached end of input in message definition (missing '}').\n");
}

TEST_F(ParseErrorTest, MissingFieldNumber) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional int32 foo;\n"
    "}\n",
    "1:20: Missing field number.\n");
}

TEST_F(ParseErrorTest, ExpectedFieldNumber) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional int32 foo = ;\n"
    "}\n",
    "1:23: Expected field number.\n");
}

TEST_F(ParseErrorTest, FieldNumberOutOfRange) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional int32 foo = 0x100000000;\n"
    "}\n",
    "1:23: Integer out of range.\n");
}

TEST_F(ParseErrorTest, MissingLabel) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  int32 foo = 1;\n"
    "}\n",
    "1:2: Expected \"required\", \"optional\", or \"repeated\".\n");
}

TEST_F(ParseErrorTest, ExpectedOptionName) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional uint32 foo = 1 [];\n"
    "}\n",
    "1:27: Expected identifier.\n");
}

TEST_F(ParseErrorTest, NonExtensionOptionNameBeginningWithDot) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional uint32 foo = 1 [.foo=1];\n"
    "}\n",
    "1:27: Expected identifier.\n");
}

TEST_F(ParseErrorTest, DefaultValueTypeMismatch) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional uint32 foo = 1 [default=true];\n"
    "}\n",
    "1:35: Expected integer for field default value.\n");
}

TEST_F(ParseErrorTest, DefaultValueNotBoolean) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional bool foo = 1 [default=blah];\n"
    "}\n",
    "1:33: Expected \"true\" or \"false\".\n");
}

TEST_F(ParseErrorTest, DefaultValueNotString) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional string foo = 1 [default=1];\n"
    "}\n",
    "1:35: Expected string for field default value.\n");
}

TEST_F(ParseErrorTest, DefaultValueUnsignedNegative) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional uint32 foo = 1 [default=-1];\n"
    "}\n",
    "1:36: Unsigned field can't have negative default value.\n");
}

TEST_F(ParseErrorTest, DefaultValueTooLarge) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional int32  foo = 1 [default= 0x80000000];\n"
    "  optional int32  foo = 1 [default=-0x80000001];\n"
    "  optional uint32 foo = 1 [default= 0x100000000];\n"
    "  optional int64  foo = 1 [default= 0x80000000000000000];\n"
    "  optional int64  foo = 1 [default=-0x80000000000000001];\n"
    "  optional uint64 foo = 1 [default= 0x100000000000000000];\n"
    "}\n",
    "1:36: Integer out of range.\n"
    "2:36: Integer out of range.\n"
    "3:36: Integer out of range.\n"
    "4:36: Integer out of range.\n"
    "5:36: Integer out of range.\n"
    "6:36: Integer out of range.\n");
}

TEST_F(ParseErrorTest, JsonNameNotString) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional string foo = 1 [json_name=1];\n"
    "}\n",
    "1:37: Expected string for JSON name.\n");
}

TEST_F(ParseErrorTest, DuplicateJsonName) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional uint32 foo = 1 [json_name=\"a\",json_name=\"b\"];\n"
    "}\n",
    "1:41: Already set option \"json_name\".\n");
}

TEST_F(ParseErrorTest, EnumValueOutOfRange) {
  ExpectHasErrors(
    "enum TestEnum {\n"
    "  HEX_TOO_BIG   =  0x80000000;\n"
    "  HEX_TOO_SMALL = -0x80000001;\n"
    "  INT_TOO_BIG   =  2147483648;\n"
    "  INT_TOO_SMALL = -2147483649;\n"
    "}\n",
    "1:19: Integer out of range.\n"
    "2:19: Integer out of range.\n"
    "3:19: Integer out of range.\n"
    "4:19: Integer out of range.\n");
}

TEST_F(ParseErrorTest, EnumAllowAliasFalse) {
  ExpectHasErrors(
    "enum Foo {\n"
    "  option allow_alias = false;\n"
    "  BAR = 1;\n"
    "  BAZ = 2;\n"
    "}\n",
    "5:0: \"Foo\" declares 'option allow_alias = false;' which has no effect. "
    "Please remove the declaration.\n");
}

TEST_F(ParseErrorTest, UnnecessaryEnumAllowAlias) {
  ExpectHasErrors(
    "enum Foo {\n"
    "  option allow_alias = true;\n"
    "  BAR = 1;\n"
    "  BAZ = 2;\n"
    "}\n",
    "5:0: \"Foo\" declares support for enum aliases but no enum values share "
    "field numbers. Please remove the unnecessary 'option allow_alias = true;' "
    "declaration.\n");
}

TEST_F(ParseErrorTest, DefaultValueMissing) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional uint32 foo = 1 [default=];\n"
    "}\n",
    "1:35: Expected integer for field default value.\n");
}

TEST_F(ParseErrorTest, DefaultValueForGroup) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional group Foo = 1 [default=blah] {}\n"
    "}\n",
    "1:34: Messages can't have default values.\n");
}

TEST_F(ParseErrorTest, DuplicateDefaultValue) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional uint32 foo = 1 [default=1,default=2];\n"
    "}\n",
    "1:37: Already set option \"default\".\n");
}

TEST_F(ParseErrorTest, MissingOneofName) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  oneof {\n"
    "    int32 bar = 1;\n"
    "  }\n"
    "}\n",
    "1:8: Expected oneof name.\n");
}

TEST_F(ParseErrorTest, LabelInOneof) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  oneof foo {\n"
    "    optional int32 bar = 1;\n"
    "  }\n"
    "}\n",
    "2:4: Fields in oneofs must not have labels (required / optional "
      "/ repeated).\n");
}

TEST_F(ParseErrorTest, MapInOneof) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  oneof foo {\n"
    "    map<int32, int32> foo_map = 1;\n"
    "    map message_field = 2;\n"  // a normal message field is OK
    "  }\n"
    "}\n",
    "2:7: Map fields are not allowed in oneofs.\n");
}

TEST_F(ParseErrorTest, LabelForMap) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional map<int32, int32> int_map = 1;\n"
    "  required map<int32, int32> int_map2 = 2;\n"
    "  repeated map<int32, int32> int_map3 = 3;\n"
    "  optional map map_message = 4;\n"  // a normal message field is OK
    "}\n",
    "1:14: Field labels (required/optional/repeated) are not allowed on map "
    "fields.\n"
    "2:14: Field labels (required/optional/repeated) are not allowed on map "
    "fields.\n"
    "3:14: Field labels (required/optional/repeated) are not allowed on map "
    "fields.\n");
}

TEST_F(ParseErrorTest, MalformedMaps) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  map map_message = 1;\n"   // a normal message field lacking label
    "  map<string> str_map = 2;\n"
    "  map<string,> str_map2 = 3;\n"
    "  map<,string> str_map3 = 4;\n"
    "  map<> empty_map = 5;\n"
    "  map<string,string str_map6 = 6;\n"
    "}"
    "extend SomeMessage {\n"
    "  map<int32, int32> int_map = 1;\n"
    "}",
    "1:6: Expected \"required\", \"optional\", or \"repeated\".\n"
    "2:12: Expected \",\".\n"
    "3:13: Expected type name.\n"
    "4:6: Expected type name.\n"
    "5:6: Expected type name.\n"
    "6:20: Expected \">\".\n"
    "8:5: Map fields are not allowed to be extensions.\n");
}

TEST_F(ParseErrorTest, GroupNotCapitalized) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional group foo = 1 {}\n"
    "}\n",
    "1:17: Group names must start with a capital letter.\n");
}

TEST_F(ParseErrorTest, GroupMissingBody) {
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional group Foo = 1;\n"
    "}\n",
    "1:24: Missing group body.\n");
}

TEST_F(ParseErrorTest, ExtendingPrimitive) {
  ExpectHasErrors(
    "extend int32 { optional string foo = 4; }\n",
    "0:7: Expected message type.\n");
}

TEST_F(ParseErrorTest, ErrorInExtension) {
  ExpectHasErrors(
    "message Foo { extensions 100 to 199; }\n"
    "extend Foo { optional string foo; }\n",
    "1:32: Missing field number.\n");
}

TEST_F(ParseErrorTest, MultipleParseErrors) {
  // When a statement has a parse error, the parser should be able to continue
  // parsing at the next statement.
  ExpectHasErrors(
    "message TestMessage {\n"
    "  optional int32 foo;\n"
    "  !invalid statement ending in a block { blah blah { blah } blah }\n"
    "  optional int32 bar = 3 {}\n"
    "}\n",
    "1:20: Missing field number.\n"
    "2:2: Expected \"required\", \"optional\", or \"repeated\".\n"
    "2:2: Expected type name.\n"
    "3:25: Expected \";\".\n");
}

TEST_F(ParseErrorTest, EofInAggregateValue) {
  ExpectHasErrors(
      "option (fileopt) = { i:100\n",
      "1:0: Unexpected end of stream while parsing aggregate value.\n");
}

TEST_F(ParseErrorTest, ExplicitOptionalLabelProto3) {
  ExpectHasErrors(
      "syntax = 'proto3';\n"
      "message TestMessage {\n"
      "  optional int32 foo = 1;\n"
      "}\n",
      "2:11: Explicit 'optional' labels are disallowed in the Proto3 syntax. "
      "To define 'optional' fields in Proto3, simply remove the 'optional' "
      "label, as fields are 'optional' by default.\n");
}


// -------------------------------------------------------------------
// Enum errors

TEST_F(ParseErrorTest, EofInEnum) {
  ExpectHasErrors(
    "enum TestEnum {",
    "0:15: Reached end of input in enum definition (missing '}').\n");
}

TEST_F(ParseErrorTest, EnumValueMissingNumber) {
  ExpectHasErrors(
    "enum TestEnum {\n"
    "  FOO;\n"
    "}\n",
    "1:5: Missing numeric value for enum constant.\n");
}

// -------------------------------------------------------------------
// Reserved field number errors

TEST_F(ParseErrorTest, ReservedMaxNotAllowed) {
  ExpectHasErrors(
    "message Foo {\n"
    "  reserved 10 to max;\n"
    "}\n",
    "1:17: Expected integer.\n");
}

TEST_F(ParseErrorTest, ReservedMixNameAndNumber) {
  ExpectHasErrors(
    "message Foo {\n"
    "  reserved 10, \"foo\";\n"
    "}\n",
    "1:15: Expected field number range.\n");
}

TEST_F(ParseErrorTest, ReservedMissingQuotes) {
  ExpectHasErrors(
    "message Foo {\n"
    "  reserved foo;\n"
    "}\n",
    "1:11: Expected field name or number range.\n");
}

// -------------------------------------------------------------------
// Service errors

TEST_F(ParseErrorTest, EofInService) {
  ExpectHasErrors(
    "service TestService {",
    "0:21: Reached end of input in service definition (missing '}').\n");
}

TEST_F(ParseErrorTest, ServiceMethodPrimitiveParams) {
  ExpectHasErrors(
    "service TestService {\n"
    "  rpc Foo(int32) returns (string);\n"
    "}\n",
    "1:10: Expected message type.\n"
    "1:26: Expected message type.\n");
}


TEST_F(ParseErrorTest, EofInMethodOptions) {
  ExpectHasErrors(
    "service TestService {\n"
    "  rpc Foo(Bar) returns(Bar) {",
    "1:29: Reached end of input in method options (missing '}').\n"
    "1:29: Reached end of input in service definition (missing '}').\n");
}


TEST_F(ParseErrorTest, PrimitiveMethodInput) {
  ExpectHasErrors(
    "service TestService {\n"
    "  rpc Foo(int32) returns(Bar);\n"
    "}\n",
    "1:10: Expected message type.\n");
}


TEST_F(ParseErrorTest, MethodOptionTypeError) {
  // This used to cause an infinite loop.
  ExpectHasErrors(
    "message Baz {}\n"
    "service Foo {\n"
    "  rpc Bar(Baz) returns(Baz) { option invalid syntax; }\n"
    "}\n",
    "2:45: Expected \"=\".\n");
}


// -------------------------------------------------------------------
// Import and package errors

TEST_F(ParseErrorTest, ImportNotQuoted) {
  ExpectHasErrors(
    "import foo;\n",
    "0:7: Expected a string naming the file to import.\n");
}

TEST_F(ParseErrorTest, MultiplePackagesInFile) {
  ExpectHasErrors(
    "package foo;\n"
    "package bar;\n",
    "1:0: Multiple package definitions.\n");
}

// ===================================================================
// Test that errors detected by DescriptorPool correctly report line and
// column numbers.  We have one test for every call to RecordLocation() in
// parser.cc.

typedef ParserTest ParserValidationErrorTest;

TEST_F(ParserValidationErrorTest, PackageNameError) {
  // Create another file which defines symbol "foo".
  FileDescriptorProto other_file;
  other_file.set_name("bar.proto");
  other_file.add_message_type()->set_name("foo");
  EXPECT_TRUE(pool_.BuildFile(other_file) != NULL);

  // Now try to define it as a package.
  ExpectHasValidationErrors(
    "package foo.bar;",
    "0:8: \"foo\" is already defined (as something other than a package) "
      "in file \"bar.proto\".\n");
}

TEST_F(ParserValidationErrorTest, MessageNameError) {
  ExpectHasValidationErrors(
    "message Foo {}\n"
    "message Foo {}\n",
    "1:8: \"Foo\" is already defined.\n");
}

TEST_F(ParserValidationErrorTest, FieldNameError) {
  ExpectHasValidationErrors(
    "message Foo {\n"
    "  optional int32 bar = 1;\n"
    "  optional int32 bar = 2;\n"
    "}\n",
    "2:17: \"bar\" is already defined in \"Foo\".\n");
}

TEST_F(ParserValidationErrorTest, FieldTypeError) {
  ExpectHasValidationErrors(
    "message Foo {\n"
    "  optional Baz bar = 1;\n"
    "}\n",
    "1:11: \"Baz\" is not defined.\n");
}

TEST_F(ParserValidationErrorTest, FieldNumberError) {
  ExpectHasValidationErrors(
    "message Foo {\n"
    "  optional int32 bar = 0;\n"
    "}\n",
    "1:23: Field numbers must be positive integers.\n");
}

TEST_F(ParserValidationErrorTest, FieldExtendeeError) {
  ExpectHasValidationErrors(
    "extend Baz { optional int32 bar = 1; }\n",
    "0:7: \"Baz\" is not defined.\n");
}

TEST_F(ParserValidationErrorTest, FieldDefaultValueError) {
  ExpectHasValidationErrors(
    "enum Baz { QUX = 1; }\n"
    "message Foo {\n"
    "  optional Baz bar = 1 [default=NO_SUCH_VALUE];\n"
    "}\n",
    "2:32: Enum type \"Baz\" has no value named \"NO_SUCH_VALUE\".\n");
}

TEST_F(ParserValidationErrorTest, FileOptionNameError) {
  ExpectHasValidationErrors(
    "option foo = 5;",
    "0:7: Option \"foo\" unknown.\n");
}

TEST_F(ParserValidationErrorTest, FileOptionValueError) {
  ExpectHasValidationErrors(
    "option java_outer_classname = 5;",
    "0:30: Value must be quoted string for string option "
    "\"google.protobuf.FileOptions.java_outer_classname\".\n");
}

TEST_F(ParserValidationErrorTest, FieldOptionNameError) {
  ExpectHasValidationErrors(
    "message Foo {\n"
    "  optional bool bar = 1 [foo=1];\n"
    "}\n",
    "1:25: Option \"foo\" unknown.\n");
}

TEST_F(ParserValidationErrorTest, FieldOptionValueError) {
  ExpectHasValidationErrors(
    "message Foo {\n"
    "  optional int32 bar = 1 [ctype=1];\n"
    "}\n",
    "1:32: Value must be identifier for enum-valued option "
    "\"google.protobuf.FieldOptions.ctype\".\n");
}

TEST_F(ParserValidationErrorTest, ExtensionRangeNumberError) {
  ExpectHasValidationErrors(
    "message Foo {\n"
    "  extensions 0;\n"
    "}\n",
    "1:13: Extension numbers must be positive integers.\n");
}

TEST_F(ParserValidationErrorTest, EnumNameError) {
  ExpectHasValidationErrors(
    "enum Foo {A = 1;}\n"
    "enum Foo {B = 1;}\n",
    "1:5: \"Foo\" is already defined.\n");
}

TEST_F(ParserValidationErrorTest, EnumValueNameError) {
  ExpectHasValidationErrors(
    "enum Foo {\n"
    "  BAR = 1;\n"
    "  BAR = 1;\n"
    "}\n",
    "2:2: \"BAR\" is already defined.\n");
}

TEST_F(ParserValidationErrorTest, ServiceNameError) {
  ExpectHasValidationErrors(
    "service Foo {}\n"
    "service Foo {}\n",
    "1:8: \"Foo\" is already defined.\n");
}

TEST_F(ParserValidationErrorTest, MethodNameError) {
  ExpectHasValidationErrors(
    "message Baz {}\n"
    "service Foo {\n"
    "  rpc Bar(Baz) returns(Baz);\n"
    "  rpc Bar(Baz) returns(Baz);\n"
    "}\n",
    "3:6: \"Bar\" is already defined in \"Foo\".\n");
}


TEST_F(ParserValidationErrorTest, MethodInputTypeError) {
  ExpectHasValidationErrors(
    "message Baz {}\n"
    "service Foo {\n"
    "  rpc Bar(Qux) returns(Baz);\n"
    "}\n",
    "2:10: \"Qux\" is not defined.\n");
}


TEST_F(ParserValidationErrorTest, MethodOutputTypeError) {
  ExpectHasValidationErrors(
    "message Baz {}\n"
    "service Foo {\n"
    "  rpc Bar(Baz) returns(Qux);\n"
    "}\n",
    "2:23: \"Qux\" is not defined.\n");
}


TEST_F(ParserValidationErrorTest, ResovledUndefinedError) {
  // Create another file which defines symbol ".base.bar".
  FileDescriptorProto other_file;
  other_file.set_name("base.proto");
  other_file.set_package("base");
  other_file.add_message_type()->set_name("bar");
  EXPECT_TRUE(pool_.BuildFile(other_file) != NULL);

  // Define "foo.base" and try "base.bar".
  // "base.bar" is resolved to "foo.base.bar" which is not defined.
  ExpectHasValidationErrors(
    "package foo.base;\n"
    "import \"base.proto\";\n"
    "message qux {\n"
    "  optional base.bar baz = 1;\n"
    "  optional .base.bar quz = 2;\n"
    "}\n",
    "3:11: \"base.bar\" is resolved to \"foo.base.bar\","
    " which is not defined. The innermost scope is searched first "
    "in name resolution. Consider using a leading '.'(i.e., \".base.bar\")"
    " to start from the outermost scope.\n");
}

TEST_F(ParserValidationErrorTest, ResovledUndefinedOptionError) {
  // Build descriptor message in test pool
  FileDescriptorProto descriptor_proto;
  DescriptorProto::descriptor()->file()->CopyTo(&descriptor_proto);
  ASSERT_TRUE(pool_.BuildFile(descriptor_proto) != NULL);

  // base2.proto:
  //   package baz
  //   import google/protobuf/descriptor.proto
  //   message Bar { optional int32 foo = 1; }
  //   extend FileOptions { optional Bar bar = 7672757; }
  FileDescriptorProto other_file;
  other_file.set_name("base2.proto");
  other_file.set_package("baz");
  other_file.add_dependency();
  other_file.set_dependency(0, descriptor_proto.name());

  DescriptorProto* message(other_file.add_message_type());
  message->set_name("Bar");
  FieldDescriptorProto* field(message->add_field());
  field->set_name("foo");
  field->set_number(1);
  field->set_label(FieldDescriptorProto_Label_LABEL_OPTIONAL);
  field->set_type(FieldDescriptorProto_Type_TYPE_INT32);

  FieldDescriptorProto* extension(other_file.add_extension());
  extension->set_name("bar");
  extension->set_number(7672757);
  extension->set_label(FieldDescriptorProto_Label_LABEL_OPTIONAL);
  extension->set_type(FieldDescriptorProto_Type_TYPE_MESSAGE);
  extension->set_type_name("Bar");
  extension->set_extendee("google.protobuf.FileOptions");

  EXPECT_TRUE(pool_.BuildFile(other_file) != NULL);

  // qux.proto:
  //   package qux.baz
  //   option (baz.bar).foo = 1;
  //
  // Although "baz.bar" is already defined, the lookup code will try
  // "qux.baz.bar", since it's the match from the innermost scope,
  // which will cause a symbol not defined error.
  ExpectHasValidationErrors(
      "package qux.baz;\n"
      "import \"base2.proto\";\n"
      "option (baz.bar).foo = 1;\n",
      "2:7: Option \"(baz.bar)\" is resolved to \"(qux.baz.bar)\","
      " which is not defined. The innermost scope is searched first "
      "in name resolution. Consider using a leading '.'(i.e., \"(.baz.bar)\")"
      " to start from the outermost scope.\n");
}

// ===================================================================
// Test that the output from FileDescriptor::DebugString() (and all other
// descriptor types) is parseable, and results in the same Descriptor
// definitions again afoter parsing (note, however, that the order of messages
// cannot be guaranteed to be the same)

typedef ParserTest ParseDescriptorDebugTest;

class CompareDescriptorNames {
 public:
  bool operator()(const DescriptorProto* left,
                  const DescriptorProto* right) const {
    return left->name() < right->name();
  }
};

// Sorts nested DescriptorProtos of a DescriptoProto, by name.
void SortMessages(DescriptorProto *descriptor_proto) {
  int size = descriptor_proto->nested_type_size();
  // recursively sort; we can't guarantee the order of nested messages either
  for (int i = 0; i < size; ++i) {
    SortMessages(descriptor_proto->mutable_nested_type(i));
  }
  DescriptorProto **data =
    descriptor_proto->mutable_nested_type()->mutable_data();
  std::sort(data, data + size, CompareDescriptorNames());
}

// Sorts DescriptorProtos belonging to a FileDescriptorProto, by name.
void SortMessages(FileDescriptorProto *file_descriptor_proto) {
  int size = file_descriptor_proto->message_type_size();
  // recursively sort; we can't guarantee the order of nested messages either
  for (int i = 0; i < size; ++i) {
    SortMessages(file_descriptor_proto->mutable_message_type(i));
  }
  DescriptorProto **data =
    file_descriptor_proto->mutable_message_type()->mutable_data();
  std::sort(data, data + size, CompareDescriptorNames());
}

// Strips the message and enum field type names for comparison purpose only.
void StripFieldTypeName(DescriptorProto* proto) {
  for (int i = 0; i < proto->field_size(); ++i) {
    string type_name = proto->field(i).type_name();
    string::size_type pos = type_name.find_last_of(".");
    if (pos != string::npos) {
      proto->mutable_field(i)->mutable_type_name()->assign(
          type_name.begin() + pos + 1, type_name.end());
    }
  }
  for (int i = 0; i < proto->nested_type_size(); ++i) {
    StripFieldTypeName(proto->mutable_nested_type(i));
  }
}

void StripFieldTypeName(FileDescriptorProto* file_proto) {
  for (int i = 0; i < file_proto->message_type_size(); ++i) {
    StripFieldTypeName(file_proto->mutable_message_type(i));
  }
}

TEST_F(ParseDescriptorDebugTest, TestAllDescriptorTypes) {
  const FileDescriptor* original_file =
     protobuf_unittest::TestAllTypes::descriptor()->file();
  FileDescriptorProto expected;
  original_file->CopyTo(&expected);

  // Get the DebugString of the unittest.proto FileDecriptor, which includes
  // all other descriptor types
  string debug_string = original_file->DebugString();

  // Parse the debug string
  SetupParser(debug_string.c_str());
  FileDescriptorProto parsed;
  parser_->Parse(input_.get(), &parsed);
  EXPECT_EQ(io::Tokenizer::TYPE_END, input_->current().type);
  ASSERT_EQ("", error_collector_.text_)
      << "Failed to parse:\n" << debug_string;

  // We now have a FileDescriptorProto, but to compare with the expected we
  // need to link to a FileDecriptor, then output back to a proto. We'll
  // also need to give it the same name as the original.
  parsed.set_name("google/protobuf/unittest.proto");
  // We need the imported dependency before we can build our parsed proto
  const FileDescriptor* public_import =
      protobuf_unittest_import::PublicImportMessage::descriptor()->file();
  FileDescriptorProto public_import_proto;
  public_import->CopyTo(&public_import_proto);
  ASSERT_TRUE(pool_.BuildFile(public_import_proto) != NULL);
  const FileDescriptor* import =
       protobuf_unittest_import::ImportMessage::descriptor()->file();
  FileDescriptorProto import_proto;
  import->CopyTo(&import_proto);
  ASSERT_TRUE(pool_.BuildFile(import_proto) != NULL);
  const FileDescriptor* actual = pool_.BuildFile(parsed);
  parsed.Clear();
  ASSERT_TRUE(actual != NULL)
      << "Failed to validate:\n" << debug_string;
  actual->CopyTo(&parsed);
  ASSERT_TRUE(actual != NULL);

  // The messages might be in different orders, making them hard to compare.
  // So, sort the messages in the descriptor protos (including nested messages,
  // recursively).
  SortMessages(&expected);
  SortMessages(&parsed);

  // I really wanted to use StringDiff here for the debug output on fail,
  // but the strings are too long for it, and if I increase its max size,
  // we get a memory allocation failure :(
  EXPECT_EQ(expected.DebugString(), parsed.DebugString());
}

TEST_F(ParseDescriptorDebugTest, TestCustomOptions) {
  const FileDescriptor* original_file =
     protobuf_unittest::AggregateMessage::descriptor()->file();
  FileDescriptorProto expected;
  original_file->CopyTo(&expected);

  string debug_string = original_file->DebugString();

  // Parse the debug string
  SetupParser(debug_string.c_str());
  FileDescriptorProto parsed;
  parser_->Parse(input_.get(), &parsed);
  EXPECT_EQ(io::Tokenizer::TYPE_END, input_->current().type);
  ASSERT_EQ("", error_collector_.text_);

  // We now have a FileDescriptorProto, but to compare with the expected we
  // need to link to a FileDecriptor, then output back to a proto. We'll
  // also need to give it the same name as the original.
  parsed.set_name(original_file->name());

  // unittest_custom_options.proto depends on descriptor.proto.
  const FileDescriptor* import = FileDescriptorProto::descriptor()->file();
  FileDescriptorProto import_proto;
  import->CopyTo(&import_proto);
  ASSERT_TRUE(pool_.BuildFile(import_proto) != NULL);
  const FileDescriptor* actual = pool_.BuildFile(parsed);
  ASSERT_TRUE(actual != NULL);
  parsed.Clear();
  actual->CopyTo(&parsed);

  // The messages might be in different orders, making them hard to compare.
  // So, sort the messages in the descriptor protos (including nested messages,
  // recursively).
  SortMessages(&expected);
  SortMessages(&parsed);

  EXPECT_EQ(expected.DebugString(), parsed.DebugString());
}

// Ensure that DebugStringWithOptions(), with |include_comments| set to true,
// includes comments from the original parser input in all of the appropriate
// places.
TEST_F(ParseDescriptorDebugTest, TestCommentsInDebugString) {
  SetupParser(
      "// Detached comment before syntax.\n"
      "\n"
      "// Syntax comment.\n"
      "syntax = \"proto2\";\n"
      "\n"
      "// Detached comment before package.\n"
      "\n"
      "// Package comment.\n"
      "package comment_test;\n"
      "\n"
      "// Detached comment before TestMessage1.\n"
      "\n"
      "// Message comment.\n"
      "//\n"
      "// More detail in message comment.\n"
      "message TestMessage1 {\n"
      "\n"
      "  // Detached comment before foo.\n"
      "\n"
      "  // Field comment.\n"
      "  optional int32 foo = 1;\n"
      "\n"
      "  // Detached comment before NestedMessage.\n"
      "\n"
      "  // Nested-message comment.\n"
      "  message NestedMessage {\n"
      "    optional int32 bar = 1;\n"
      "  }\n"
      "}\n"
      "\n"
      "// Detached comment before MyEnumType.\n"
      "\n"
      "// Enum comment.\n"
      "enum MyEnumType {\n"
      "\n"
      "  // Detached comment before ASDF.\n"
      "\n"
      "  // Enum-value comment.\n"
      "  ASDF = 1;\n"
      "}\n"
      "\n"
      "// Detached comment before MyService.\n"
      "\n"
      "// Service comment.\n"
      "service MyService {\n"
      "\n"
      "  // Detached comment before MyRPCCall.\n"
      "\n"
      "  // RPC comment.\n"
      "  rpc MyRPCCall(TestMessage1) returns (TestMessage1) { }\n"
      "}\n");

  FileDescriptorProto parsed_desc;
  parsed_desc.set_name("foo.proto");
  SourceLocationTable source_locations;
  parser_->RecordSourceLocationsTo(&source_locations);
  parser_->Parse(input_.get(), &parsed_desc);
  EXPECT_EQ(io::Tokenizer::TYPE_END, input_->current().type);
  ASSERT_EQ("", error_collector_.text_);

  // We need to import the FileDescriptorProto to get a FileDescriptor.
  MockValidationErrorCollector collector(source_locations, &error_collector_);
  const FileDescriptor* descriptor =
      pool_.BuildFileCollectingErrors(parsed_desc, &collector);
  ASSERT_TRUE(descriptor != NULL);

  // Ensure that each of the comments appears somewhere in the DebugString().
  // We don't test the exact comment placement or formatting, because we do not
  // want to be too fragile here.
  const char* expected_comments[] = {
    "Detached comment before syntax.",
    "Syntax comment.",
    "Detached comment before package.",
    "Package comment.",
    "Detached comment before TestMessage1.",
    "Message comment.",
    "More detail in message comment.",
    "Detached comment before foo.",
    "Field comment",
    "Detached comment before NestedMessage.",
    "Nested-message comment",
    "Detached comment before MyEnumType.",
    "Enum comment",
    "Detached comment before ASDF.",
    "Enum-value comment",
    "Detached comment before MyService.",
    "Service comment",
    "Detached comment before MyRPCCall.",
    "RPC comment",
  };

  DebugStringOptions debug_string_options;
  debug_string_options.include_comments = true;

  {
    const string debug_string =
        descriptor->DebugStringWithOptions(debug_string_options);

    for (int i = 0; i < GOOGLE_ARRAYSIZE(expected_comments); ++i) {
      string::size_type found_pos = debug_string.find(expected_comments[i]);
      EXPECT_TRUE(found_pos != string::npos)
          << "\"" << expected_comments[i] << "\" not found.";
    }

    // Result of DebugStringWithOptions should be parseable.
    SetupParser(debug_string.c_str());
    FileDescriptorProto parsed;
    parser_->Parse(input_.get(), &parsed);
    EXPECT_EQ(io::Tokenizer::TYPE_END, input_->current().type);
    ASSERT_EQ("", error_collector_.text_)
        << "Failed to parse:\n" << debug_string;
  }

}

TEST_F(ParseDescriptorDebugTest, TestMaps) {
  SetupParser(
      "syntax = \"proto3\"; "
      "message Foo { "
      "  message Bar { } "
      "  map<int32, Bar> enum_message_map = 1; "
      "  map<string, float> primitive_map = 2; "
      "} ");
  FileDescriptorProto original;
  EXPECT_TRUE(parser_->Parse(input_.get(), &original));
  original.set_name("foo.proto");
  const FileDescriptor* file = pool_.BuildFile(original);
  ASSERT_TRUE(file != NULL);

  // Make sure the debug string uses map syntax and does not have the auto
  // generated entry.
  string debug_string = file->DebugString();
  EXPECT_TRUE(debug_string.find("map<") != string::npos);
  EXPECT_TRUE(debug_string.find("option map_entry") == string::npos);
  EXPECT_TRUE(debug_string.find("MapEntry") == string::npos);

  // Make sure the descriptor debug string is parsable.
  FileDescriptorProto parsed;
  SetupParser(debug_string.c_str());
  parsed.set_name("foo.proto");
  ASSERT_TRUE(parser_->Parse(input_.get(), &parsed));

  original.clear_source_code_info();
  parsed.clear_source_code_info();
  StripFieldTypeName(&original);
  StripFieldTypeName(&parsed);
  EXPECT_EQ(original.DebugString(), parsed.DebugString());
}

// ===================================================================
// SourceCodeInfo tests.

// Follows a path -- as defined by SourceCodeInfo.Location.path -- from a
// message to a particular sub-field.
// * If the target is itself a message, sets *output_message to point at it,
//   *output_field to NULL, and *output_index to -1.
// * Otherwise, if the target is an element of a repeated field, sets
//   *output_message to the containing message, *output_field to the descriptor
//   of the field, and *output_index to the index of the element.
// * Otherwise, the target is a field (possibly a repeated field, but not any
//   one element).  Sets *output_message to the containing message,
//   *output_field to the descriptor of the field, and *output_index to -1.
// Returns true if the path was valid, false otherwise.  A gTest failure is
// recorded before returning false.
bool FollowPath(const Message& root,
                const int* path_begin, const int* path_end,
                const Message** output_message,
                const FieldDescriptor** output_field,
                int* output_index) {
  if (path_begin == path_end) {
    // Path refers to this whole message.
    *output_message = &root;
    *output_field = NULL;
    *output_index = -1;
    return true;
  }

  const Descriptor* descriptor = root.GetDescriptor();
  const Reflection* reflection = root.GetReflection();

  const FieldDescriptor* field = descriptor->FindFieldByNumber(*path_begin);

  if (field == NULL) {
    ADD_FAILURE() << descriptor->name() << " has no field number: "
                  << *path_begin;
    return false;
  }

  ++path_begin;

  if (field->is_repeated()) {
    if (path_begin == path_end) {
      // Path refers to the whole repeated field.
      *output_message = &root;
      *output_field = field;
      *output_index = -1;
      return true;
    }

    int index = *path_begin++;
    int size = reflection->FieldSize(root, field);

    if (index >= size) {
      ADD_FAILURE() << descriptor->name() << "." << field->name()
                    << " has size " << size << ", but path contained index: "
                    << index;
      return false;
    }

    if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
      // Descend into child message.
      const Message& child = reflection->GetRepeatedMessage(root, field, index);
      return FollowPath(child, path_begin, path_end,
                        output_message, output_field, output_index);
    } else if (path_begin == path_end) {
      // Path refers to this element.
      *output_message = &root;
      *output_field = field;
      *output_index = index;
      return true;
    } else {
      ADD_FAILURE() << descriptor->name() << "." << field->name()
                    << " is not a message; cannot descend into it.";
      return false;
    }
  } else {
    if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
      const Message& child = reflection->GetMessage(root, field);
      return FollowPath(child, path_begin, path_end,
                        output_message, output_field, output_index);
    } else if (path_begin == path_end) {
      // Path refers to this field.
      *output_message = &root;
      *output_field = field;
      *output_index = -1;
      return true;
    } else {
      ADD_FAILURE() << descriptor->name() << "." << field->name()
                    << " is not a message; cannot descend into it.";
      return false;
    }
  }
}

// Check if two spans are equal.
bool CompareSpans(const RepeatedField<int>& span1,
                  const RepeatedField<int>& span2) {
  if (span1.size() != span2.size()) return false;
  for (int i = 0; i < span1.size(); i++) {
    if (span1.Get(i) != span2.Get(i)) return false;
  }
  return true;
}

// Test fixture for source info tests, which check that source locations are
// recorded correctly in FileDescriptorProto.source_code_info.location.
class SourceInfoTest : public ParserTest {
 protected:
  // The parsed file (initialized by Parse()).
  FileDescriptorProto file_;

  // Parse the given text as a .proto file and populate the spans_ map with
  // all the source location spans in its SourceCodeInfo table.
  bool Parse(const char* text) {
    ExtractMarkers(text);
    SetupParser(text_without_markers_.c_str());
    if (!parser_->Parse(input_.get(), &file_)) {
      return false;
    }

    const SourceCodeInfo& source_info = file_.source_code_info();
    for (int i = 0; i < source_info.location_size(); i++) {
      const SourceCodeInfo::Location& location = source_info.location(i);
      const Message* descriptor_proto = NULL;
      const FieldDescriptor* field = NULL;
      int index = 0;
      if (!FollowPath(file_, location.path().begin(), location.path().end(),
                      &descriptor_proto, &field, &index)) {
        return false;
      }

      spans_.insert(
          std::make_pair(SpanKey(*descriptor_proto, field, index), &location));
    }

    return true;
  }

  virtual void TearDown() {
    EXPECT_TRUE(spans_.empty())
        << "Forgot to call HasSpan() for:\n"
        << spans_.begin()->second->DebugString();
  }

  // -----------------------------------------------------------------
  // HasSpan() checks that the span of source code delimited by the given
  // tags (comments) correspond via the SourceCodeInfo table to the given
  // part of the FileDescriptorProto.  (If unclear, look at the actual tests;
  // it should quickly become obvious.)

  bool HasSpan(char start_marker, char end_marker,
               const Message& descriptor_proto) {
    return HasSpanWithComment(
        start_marker, end_marker, descriptor_proto, NULL, -1, NULL, NULL, NULL);
  }

  bool HasSpanWithComment(char start_marker, char end_marker,
                          const Message& descriptor_proto,
                          const char* expected_leading_comments,
                          const char* expected_trailing_comments,
                          const char* expected_leading_detached_comments) {
    return HasSpanWithComment(
        start_marker, end_marker, descriptor_proto, NULL, -1,
        expected_leading_comments, expected_trailing_comments,
        expected_leading_detached_comments);
  }

  bool HasSpan(char start_marker, char end_marker,
               const Message& descriptor_proto, const string& field_name) {
    return HasSpan(start_marker, end_marker, descriptor_proto, field_name, -1);
  }

  bool HasSpan(char start_marker, char end_marker,
               const Message& descriptor_proto, const string& field_name,
               int index) {
    return HasSpan(start_marker, end_marker, descriptor_proto,
                   field_name, index, NULL, NULL, NULL);
  }

  bool HasSpan(char start_marker, char end_marker,
               const Message& descriptor_proto,
               const string& field_name, int index,
               const char* expected_leading_comments,
               const char* expected_trailing_comments,
               const char* expected_leading_detached_comments) {
    const FieldDescriptor* field =
        descriptor_proto.GetDescriptor()->FindFieldByName(field_name);
    if (field == NULL) {
      ADD_FAILURE() << descriptor_proto.GetDescriptor()->name()
                    << " has no such field: " << field_name;
      return false;
    }

    return HasSpanWithComment(
        start_marker, end_marker, descriptor_proto, field, index,
        expected_leading_comments, expected_trailing_comments,
        expected_leading_detached_comments);
  }

  bool HasSpan(const Message& descriptor_proto) {
    return HasSpanWithComment(
        '\0', '\0', descriptor_proto, NULL, -1, NULL, NULL, NULL);
  }

  bool HasSpan(const Message& descriptor_proto, const string& field_name) {
    return HasSpan('\0', '\0', descriptor_proto, field_name, -1);
  }

  bool HasSpan(const Message& descriptor_proto, const string& field_name,
               int index) {
    return HasSpan('\0', '\0', descriptor_proto, field_name, index);
  }

  bool HasSpanWithComment(
      char start_marker, char end_marker, const Message& descriptor_proto,
      const FieldDescriptor* field, int index,
      const char* expected_leading_comments,
      const char* expected_trailing_comments,
      const char* expected_leading_detached_comments) {
    pair<SpanMap::iterator, SpanMap::iterator> range =
        spans_.equal_range(SpanKey(descriptor_proto, field, index));

    if (start_marker == '\0') {
      if (range.first == range.second) {
        return false;
      } else {
        spans_.erase(range.first);
        return true;
      }
    } else {
      pair<int, int> start_pos = FindOrDie(markers_, start_marker);
      pair<int, int> end_pos = FindOrDie(markers_, end_marker);

      RepeatedField<int> expected_span;
      expected_span.Add(start_pos.first);
      expected_span.Add(start_pos.second);
      if (end_pos.first != start_pos.first) {
        expected_span.Add(end_pos.first);
      }
      expected_span.Add(end_pos.second);

      for (SpanMap::iterator iter = range.first; iter != range.second; ++iter) {
        if (CompareSpans(expected_span, iter->second->span())) {
          if (expected_leading_comments == NULL) {
            EXPECT_FALSE(iter->second->has_leading_comments());
          } else {
            EXPECT_TRUE(iter->second->has_leading_comments());
            EXPECT_EQ(expected_leading_comments,
                      iter->second->leading_comments());
          }
          if (expected_trailing_comments == NULL) {
            EXPECT_FALSE(iter->second->has_trailing_comments());
          } else {
            EXPECT_TRUE(iter->second->has_trailing_comments());
            EXPECT_EQ(expected_trailing_comments,
                      iter->second->trailing_comments());
          }
          if (expected_leading_detached_comments == NULL) {
            EXPECT_EQ(0, iter->second->leading_detached_comments_size());
          } else {
            EXPECT_EQ(
                expected_leading_detached_comments,
                Join(iter->second->leading_detached_comments(), "\n"));
          }

          spans_.erase(iter);
          return true;
        }
      }

      return false;
    }
  }

 private:
  struct SpanKey {
    const Message* descriptor_proto;
    const FieldDescriptor* field;
    int index;

    inline SpanKey() {}
    inline SpanKey(const Message& descriptor_proto_param,
                   const FieldDescriptor* field_param,
                   int index_param)
        : descriptor_proto(&descriptor_proto_param), field(field_param),
          index(index_param) {}

    inline bool operator<(const SpanKey& other) const {
      if (descriptor_proto < other.descriptor_proto) return true;
      if (descriptor_proto > other.descriptor_proto) return false;
      if (field < other.field) return true;
      if (field > other.field) return false;
      return index < other.index;
    }
  };

  typedef multimap<SpanKey, const SourceCodeInfo::Location*> SpanMap;
  SpanMap spans_;
  map<char, pair<int, int> > markers_;
  string text_without_markers_;

  void ExtractMarkers(const char* text) {
    markers_.clear();
    text_without_markers_.clear();
    int line = 0;
    int column = 0;
    while (*text != '\0') {
      if (*text == '$') {
        ++text;
        GOOGLE_CHECK_NE('\0', *text);
        if (*text == '$') {
          text_without_markers_ += '$';
          ++column;
        } else {
          markers_[*text] = std::make_pair(line, column);
          ++text;
          GOOGLE_CHECK_EQ('$', *text);
        }
      } else if (*text == '\n') {
        ++line;
        column = 0;
        text_without_markers_ += *text;
      } else {
        text_without_markers_ += *text;
        ++column;
      }
      ++text;
    }
  }
};

TEST_F(SourceInfoTest, BasicFileDecls) {
  EXPECT_TRUE(Parse(
      "$a$syntax = \"proto2\";$i$\n"
      "package $b$foo.bar$c$;\n"
      "import $d$\"baz.proto\"$e$;\n"
      "import $f$\"qux.proto\"$g$;$h$\n"
      "\n"
      "// comment ignored\n"));

  EXPECT_TRUE(HasSpan('a', 'h', file_));
  EXPECT_TRUE(HasSpan('b', 'c', file_, "package"));
  EXPECT_TRUE(HasSpan('d', 'e', file_, "dependency", 0));
  EXPECT_TRUE(HasSpan('f', 'g', file_, "dependency", 1));
  EXPECT_TRUE(HasSpan('a', 'i', file_, "syntax"));
}

TEST_F(SourceInfoTest, Messages) {
  EXPECT_TRUE(Parse(
      "$a$message $b$Foo$c$ {}$d$\n"
      "$e$message $f$Bar$g$ {}$h$\n"));

  EXPECT_TRUE(HasSpan('a', 'd', file_.message_type(0)));
  EXPECT_TRUE(HasSpan('b', 'c', file_.message_type(0), "name"));
  EXPECT_TRUE(HasSpan('e', 'h', file_.message_type(1)));
  EXPECT_TRUE(HasSpan('f', 'g', file_.message_type(1), "name"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
}

TEST_F(SourceInfoTest, Fields) {
  EXPECT_TRUE(Parse(
      "message Foo {\n"
      "  $a$optional$b$ $c$int32$d$ $e$bar$f$ = $g$1$h$;$i$\n"
      "  $j$repeated$k$ $l$X.Y$m$ $n$baz$o$ = $p$2$q$;$r$\n"
      "}\n"));

  const FieldDescriptorProto& field1 = file_.message_type(0).field(0);
  const FieldDescriptorProto& field2 = file_.message_type(0).field(1);

  EXPECT_TRUE(HasSpan('a', 'i', field1));
  EXPECT_TRUE(HasSpan('a', 'b', field1, "label"));
  EXPECT_TRUE(HasSpan('c', 'd', field1, "type"));
  EXPECT_TRUE(HasSpan('e', 'f', field1, "name"));
  EXPECT_TRUE(HasSpan('g', 'h', field1, "number"));

  EXPECT_TRUE(HasSpan('j', 'r', field2));
  EXPECT_TRUE(HasSpan('j', 'k', field2, "label"));
  EXPECT_TRUE(HasSpan('l', 'm', field2, "type_name"));
  EXPECT_TRUE(HasSpan('n', 'o', field2, "name"));
  EXPECT_TRUE(HasSpan('p', 'q', field2, "number"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
}

TEST_F(SourceInfoTest, Extensions) {
  EXPECT_TRUE(Parse(
      "$a$extend $b$Foo$c$ {\n"
      "  $d$optional$e$ int32 bar = 1;$f$\n"
      "  $g$repeated$h$ X.Y baz = 2;$i$\n"
      "}$j$\n"
      "$k$extend $l$Bar$m$ {\n"
      "  $n$optional int32 qux = 1;$o$\n"
      "}$p$\n"));

  const FieldDescriptorProto& field1 = file_.extension(0);
  const FieldDescriptorProto& field2 = file_.extension(1);
  const FieldDescriptorProto& field3 = file_.extension(2);

  EXPECT_TRUE(HasSpan('a', 'j', file_, "extension"));
  EXPECT_TRUE(HasSpan('k', 'p', file_, "extension"));

  EXPECT_TRUE(HasSpan('d', 'f', field1));
  EXPECT_TRUE(HasSpan('d', 'e', field1, "label"));
  EXPECT_TRUE(HasSpan('b', 'c', field1, "extendee"));

  EXPECT_TRUE(HasSpan('g', 'i', field2));
  EXPECT_TRUE(HasSpan('g', 'h', field2, "label"));
  EXPECT_TRUE(HasSpan('b', 'c', field2, "extendee"));

  EXPECT_TRUE(HasSpan('n', 'o', field3));
  EXPECT_TRUE(HasSpan('l', 'm', field3, "extendee"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(field1, "type"));
  EXPECT_TRUE(HasSpan(field1, "name"));
  EXPECT_TRUE(HasSpan(field1, "number"));
  EXPECT_TRUE(HasSpan(field2, "type_name"));
  EXPECT_TRUE(HasSpan(field2, "name"));
  EXPECT_TRUE(HasSpan(field2, "number"));
  EXPECT_TRUE(HasSpan(field3, "label"));
  EXPECT_TRUE(HasSpan(field3, "type"));
  EXPECT_TRUE(HasSpan(field3, "name"));
  EXPECT_TRUE(HasSpan(field3, "number"));
}

TEST_F(SourceInfoTest, NestedExtensions) {
  EXPECT_TRUE(Parse(
      "message Message {\n"
      "  $a$extend $b$Foo$c$ {\n"
      "    $d$optional$e$ int32 bar = 1;$f$\n"
      "    $g$repeated$h$ X.Y baz = 2;$i$\n"
      "  }$j$\n"
      "  $k$extend $l$Bar$m$ {\n"
      "    $n$optional int32 qux = 1;$o$\n"
      "  }$p$\n"
      "}\n"));

  const FieldDescriptorProto& field1 = file_.message_type(0).extension(0);
  const FieldDescriptorProto& field2 = file_.message_type(0).extension(1);
  const FieldDescriptorProto& field3 = file_.message_type(0).extension(2);

  EXPECT_TRUE(HasSpan('a', 'j', file_.message_type(0), "extension"));
  EXPECT_TRUE(HasSpan('k', 'p', file_.message_type(0), "extension"));

  EXPECT_TRUE(HasSpan('d', 'f', field1));
  EXPECT_TRUE(HasSpan('d', 'e', field1, "label"));
  EXPECT_TRUE(HasSpan('b', 'c', field1, "extendee"));

  EXPECT_TRUE(HasSpan('g', 'i', field2));
  EXPECT_TRUE(HasSpan('g', 'h', field2, "label"));
  EXPECT_TRUE(HasSpan('b', 'c', field2, "extendee"));

  EXPECT_TRUE(HasSpan('n', 'o', field3));
  EXPECT_TRUE(HasSpan('l', 'm', field3, "extendee"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
  EXPECT_TRUE(HasSpan(field1, "type"));
  EXPECT_TRUE(HasSpan(field1, "name"));
  EXPECT_TRUE(HasSpan(field1, "number"));
  EXPECT_TRUE(HasSpan(field2, "type_name"));
  EXPECT_TRUE(HasSpan(field2, "name"));
  EXPECT_TRUE(HasSpan(field2, "number"));
  EXPECT_TRUE(HasSpan(field3, "label"));
  EXPECT_TRUE(HasSpan(field3, "type"));
  EXPECT_TRUE(HasSpan(field3, "name"));
  EXPECT_TRUE(HasSpan(field3, "number"));
}

TEST_F(SourceInfoTest, ExtensionRanges) {
  EXPECT_TRUE(Parse(
      "message Message {\n"
      "  $a$extensions $b$1$c$ to $d$4$e$, $f$6$g$;$h$\n"
      "  $i$extensions $j$8$k$ to $l$max$m$;$n$\n"
      "}\n"));

  const DescriptorProto::ExtensionRange& range1 =
      file_.message_type(0).extension_range(0);
  const DescriptorProto::ExtensionRange& range2 =
      file_.message_type(0).extension_range(1);
  const DescriptorProto::ExtensionRange& range3 =
      file_.message_type(0).extension_range(2);

  EXPECT_TRUE(HasSpan('a', 'h', file_.message_type(0), "extension_range"));
  EXPECT_TRUE(HasSpan('i', 'n', file_.message_type(0), "extension_range"));

  EXPECT_TRUE(HasSpan('b', 'e', range1));
  EXPECT_TRUE(HasSpan('b', 'c', range1, "start"));
  EXPECT_TRUE(HasSpan('d', 'e', range1, "end"));

  EXPECT_TRUE(HasSpan('f', 'g', range2));
  EXPECT_TRUE(HasSpan('f', 'g', range2, "start"));
  EXPECT_TRUE(HasSpan('f', 'g', range2, "end"));

  EXPECT_TRUE(HasSpan('j', 'm', range3));
  EXPECT_TRUE(HasSpan('j', 'k', range3, "start"));
  EXPECT_TRUE(HasSpan('l', 'm', range3, "end"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
}

TEST_F(SourceInfoTest, Oneofs) {
  EXPECT_TRUE(Parse(
      "message Foo {\n"
      "  $a$oneof $c$foo$d$ {\n"
      "    $e$int32$f$ $g$a$h$ = $i$1$j$;$k$\n"
      "  }$r$\n"
      "}\n"));

  const OneofDescriptorProto& oneof_decl = file_.message_type(0).oneof_decl(0);
  const FieldDescriptorProto& field = file_.message_type(0).field(0);

  EXPECT_TRUE(HasSpan('a', 'r', oneof_decl));
  EXPECT_TRUE(HasSpan('c', 'd', oneof_decl, "name"));

  EXPECT_TRUE(HasSpan('e', 'k', field));
  EXPECT_TRUE(HasSpan('e', 'f', field, "type"));
  EXPECT_TRUE(HasSpan('g', 'h', field, "name"));
  EXPECT_TRUE(HasSpan('i', 'j', field, "number"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
}

TEST_F(SourceInfoTest, NestedMessages) {
  EXPECT_TRUE(Parse(
      "message Foo {\n"
      "  $a$message $b$Bar$c$ {\n"
      "    $d$message $e$Baz$f$ {}$g$\n"
      "  }$h$\n"
      "  $i$message $j$Qux$k$ {}$l$\n"
      "}\n"));

  const DescriptorProto& bar = file_.message_type(0).nested_type(0);
  const DescriptorProto& baz = bar.nested_type(0);
  const DescriptorProto& qux = file_.message_type(0).nested_type(1);

  EXPECT_TRUE(HasSpan('a', 'h', bar));
  EXPECT_TRUE(HasSpan('b', 'c', bar, "name"));
  EXPECT_TRUE(HasSpan('d', 'g', baz));
  EXPECT_TRUE(HasSpan('e', 'f', baz, "name"));
  EXPECT_TRUE(HasSpan('i', 'l', qux));
  EXPECT_TRUE(HasSpan('j', 'k', qux, "name"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
}

TEST_F(SourceInfoTest, Groups) {
  EXPECT_TRUE(Parse(
      "message Foo {\n"
      "  message Bar {}\n"
      "  $a$optional$b$ $c$group$d$ $e$Baz$f$ = $g$1$h$ {\n"
      "    $i$message Qux {}$j$\n"
      "  }$k$\n"
      "}\n"));

  const DescriptorProto& bar = file_.message_type(0).nested_type(0);
  const DescriptorProto& baz = file_.message_type(0).nested_type(1);
  const DescriptorProto& qux = baz.nested_type(0);
  const FieldDescriptorProto& field = file_.message_type(0).field(0);

  EXPECT_TRUE(HasSpan('a', 'k', field));
  EXPECT_TRUE(HasSpan('a', 'b', field, "label"));
  EXPECT_TRUE(HasSpan('c', 'd', field, "type"));
  EXPECT_TRUE(HasSpan('e', 'f', field, "name"));
  EXPECT_TRUE(HasSpan('e', 'f', field, "type_name"));
  EXPECT_TRUE(HasSpan('g', 'h', field, "number"));

  EXPECT_TRUE(HasSpan('a', 'k', baz));
  EXPECT_TRUE(HasSpan('e', 'f', baz, "name"));
  EXPECT_TRUE(HasSpan('i', 'j', qux));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
  EXPECT_TRUE(HasSpan(bar));
  EXPECT_TRUE(HasSpan(bar, "name"));
  EXPECT_TRUE(HasSpan(qux, "name"));
}

TEST_F(SourceInfoTest, Enums) {
  EXPECT_TRUE(Parse(
      "$a$enum $b$Foo$c$ {}$d$\n"
      "$e$enum $f$Bar$g$ {}$h$\n"));

  EXPECT_TRUE(HasSpan('a', 'd', file_.enum_type(0)));
  EXPECT_TRUE(HasSpan('b', 'c', file_.enum_type(0), "name"));
  EXPECT_TRUE(HasSpan('e', 'h', file_.enum_type(1)));
  EXPECT_TRUE(HasSpan('f', 'g', file_.enum_type(1), "name"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
}

TEST_F(SourceInfoTest, EnumValues) {
  EXPECT_TRUE(Parse(
      "enum Foo {\n"
      "  $a$BAR$b$ = $c$1$d$;$e$\n"
      "  $f$BAZ$g$ = $h$2$i$;$j$\n"
      "}"));

  const EnumValueDescriptorProto& bar = file_.enum_type(0).value(0);
  const EnumValueDescriptorProto& baz = file_.enum_type(0).value(1);

  EXPECT_TRUE(HasSpan('a', 'e', bar));
  EXPECT_TRUE(HasSpan('a', 'b', bar, "name"));
  EXPECT_TRUE(HasSpan('c', 'd', bar, "number"));
  EXPECT_TRUE(HasSpan('f', 'j', baz));
  EXPECT_TRUE(HasSpan('f', 'g', baz, "name"));
  EXPECT_TRUE(HasSpan('h', 'i', baz, "number"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.enum_type(0)));
  EXPECT_TRUE(HasSpan(file_.enum_type(0), "name"));
}

TEST_F(SourceInfoTest, NestedEnums) {
  EXPECT_TRUE(Parse(
      "message Foo {\n"
      "  $a$enum $b$Bar$c$ {}$d$\n"
      "  $e$enum $f$Baz$g$ {}$h$\n"
      "}\n"));

  const EnumDescriptorProto& bar = file_.message_type(0).enum_type(0);
  const EnumDescriptorProto& baz = file_.message_type(0).enum_type(1);

  EXPECT_TRUE(HasSpan('a', 'd', bar));
  EXPECT_TRUE(HasSpan('b', 'c', bar, "name"));
  EXPECT_TRUE(HasSpan('e', 'h', baz));
  EXPECT_TRUE(HasSpan('f', 'g', baz, "name"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
}

TEST_F(SourceInfoTest, Services) {
  EXPECT_TRUE(Parse(
      "$a$service $b$Foo$c$ {}$d$\n"
      "$e$service $f$Bar$g$ {}$h$\n"));

  EXPECT_TRUE(HasSpan('a', 'd', file_.service(0)));
  EXPECT_TRUE(HasSpan('b', 'c', file_.service(0), "name"));
  EXPECT_TRUE(HasSpan('e', 'h', file_.service(1)));
  EXPECT_TRUE(HasSpan('f', 'g', file_.service(1), "name"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
}

TEST_F(SourceInfoTest, MethodsAndStreams) {
  EXPECT_TRUE(Parse(
      "service Foo {\n"
      "  $a$rpc $b$Bar$c$($d$X$e$) returns($f$Y$g$);$h$"
      "  $i$rpc $j$Baz$k$($l$Z$m$) returns($n$W$o$);$p$"
      "}"));

  const MethodDescriptorProto& bar = file_.service(0).method(0);
  const MethodDescriptorProto& baz = file_.service(0).method(1);

  EXPECT_TRUE(HasSpan('a', 'h', bar));
  EXPECT_TRUE(HasSpan('b', 'c', bar, "name"));
  EXPECT_TRUE(HasSpan('d', 'e', bar, "input_type"));
  EXPECT_TRUE(HasSpan('f', 'g', bar, "output_type"));

  EXPECT_TRUE(HasSpan('i', 'p', baz));
  EXPECT_TRUE(HasSpan('j', 'k', baz, "name"));
  EXPECT_TRUE(HasSpan('l', 'm', baz, "input_type"));
  EXPECT_TRUE(HasSpan('n', 'o', baz, "output_type"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.service(0)));
  EXPECT_TRUE(HasSpan(file_.service(0), "name"));
}


TEST_F(SourceInfoTest, Options) {
  EXPECT_TRUE(Parse(
      "$a$option $b$foo$c$.$d$($e$bar.baz$f$)$g$ = "
          "$h$123$i$;$j$\n"
      "$k$option qux = $l$-123$m$;$n$\n"
      "$o$option corge = $p$abc$q$;$r$\n"
      "$s$option grault = $t$'blah'$u$;$v$\n"
      "$w$option garply = $x${ yadda yadda }$y$;$z$\n"
      "$0$option waldo = $1$123.0$2$;$3$\n"
  ));

  const UninterpretedOption& option1 = file_.options().uninterpreted_option(0);
  const UninterpretedOption& option2 = file_.options().uninterpreted_option(1);
  const UninterpretedOption& option3 = file_.options().uninterpreted_option(2);
  const UninterpretedOption& option4 = file_.options().uninterpreted_option(3);
  const UninterpretedOption& option5 = file_.options().uninterpreted_option(4);
  const UninterpretedOption& option6 = file_.options().uninterpreted_option(5);

  EXPECT_TRUE(HasSpan('a', 'j', file_.options()));
  EXPECT_TRUE(HasSpan('a', 'j', option1));
  EXPECT_TRUE(HasSpan('b', 'g', option1, "name"));
  EXPECT_TRUE(HasSpan('b', 'c', option1.name(0)));
  EXPECT_TRUE(HasSpan('b', 'c', option1.name(0), "name_part"));
  EXPECT_TRUE(HasSpan('d', 'g', option1.name(1)));
  EXPECT_TRUE(HasSpan('e', 'f', option1.name(1), "name_part"));
  EXPECT_TRUE(HasSpan('h', 'i', option1, "positive_int_value"));

  EXPECT_TRUE(HasSpan('k', 'n', file_.options()));
  EXPECT_TRUE(HasSpan('l', 'm', option2, "negative_int_value"));

  EXPECT_TRUE(HasSpan('o', 'r', file_.options()));
  EXPECT_TRUE(HasSpan('p', 'q', option3, "identifier_value"));

  EXPECT_TRUE(HasSpan('s', 'v', file_.options()));
  EXPECT_TRUE(HasSpan('t', 'u', option4, "string_value"));

  EXPECT_TRUE(HasSpan('w', 'z', file_.options()));
  EXPECT_TRUE(HasSpan('x', 'y', option5, "aggregate_value"));

  EXPECT_TRUE(HasSpan('0', '3', file_.options()));
  EXPECT_TRUE(HasSpan('1', '2', option6, "double_value"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(option2));
  EXPECT_TRUE(HasSpan(option3));
  EXPECT_TRUE(HasSpan(option4));
  EXPECT_TRUE(HasSpan(option5));
  EXPECT_TRUE(HasSpan(option6));
  EXPECT_TRUE(HasSpan(option2, "name"));
  EXPECT_TRUE(HasSpan(option3, "name"));
  EXPECT_TRUE(HasSpan(option4, "name"));
  EXPECT_TRUE(HasSpan(option5, "name"));
  EXPECT_TRUE(HasSpan(option6, "name"));
  EXPECT_TRUE(HasSpan(option2.name(0)));
  EXPECT_TRUE(HasSpan(option3.name(0)));
  EXPECT_TRUE(HasSpan(option4.name(0)));
  EXPECT_TRUE(HasSpan(option5.name(0)));
  EXPECT_TRUE(HasSpan(option6.name(0)));
  EXPECT_TRUE(HasSpan(option2.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option3.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option4.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option5.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option6.name(0), "name_part"));
}

TEST_F(SourceInfoTest, ScopedOptions) {
  EXPECT_TRUE(Parse(
    "message Foo {\n"
    "  $a$option mopt = 1;$b$\n"
    "}\n"
    "enum Bar {\n"
    "  $c$option eopt = 1;$d$\n"
    "}\n"
    "service Baz {\n"
    "  $e$option sopt = 1;$f$\n"
    "  rpc M(X) returns(Y) {\n"
    "    $g$option mopt = 1;$h$\n"
    "  }\n"
    "  rpc MS4($1$stream$2$ X) returns($3$stream$4$ Y) {\n"
    "    $k$option mopt = 1;$l$\n"
    "  }\n"
    "}\n"));

  EXPECT_TRUE(HasSpan('a', 'b', file_.message_type(0).options()));
  EXPECT_TRUE(HasSpan('c', 'd', file_.enum_type(0).options()));
  EXPECT_TRUE(HasSpan('e', 'f', file_.service(0).options()));
  EXPECT_TRUE(HasSpan('g', 'h', file_.service(0).method(0).options()));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
  EXPECT_TRUE(HasSpan(file_.message_type(0).options()
                      .uninterpreted_option(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0).options()
                      .uninterpreted_option(0), "name"));
  EXPECT_TRUE(HasSpan(file_.message_type(0).options()
                      .uninterpreted_option(0).name(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0).options()
                      .uninterpreted_option(0).name(0), "name_part"));
  EXPECT_TRUE(HasSpan(file_.message_type(0).options()
                      .uninterpreted_option(0), "positive_int_value"));
  EXPECT_TRUE(HasSpan(file_.enum_type(0)));
  EXPECT_TRUE(HasSpan(file_.enum_type(0), "name"));
  EXPECT_TRUE(HasSpan(file_.enum_type(0).options()
                      .uninterpreted_option(0)));
  EXPECT_TRUE(HasSpan(file_.enum_type(0).options()
                      .uninterpreted_option(0), "name"));
  EXPECT_TRUE(HasSpan(file_.enum_type(0).options()
                      .uninterpreted_option(0).name(0)));
  EXPECT_TRUE(HasSpan(file_.enum_type(0).options()
                      .uninterpreted_option(0).name(0), "name_part"));
  EXPECT_TRUE(HasSpan(file_.enum_type(0).options()
                      .uninterpreted_option(0), "positive_int_value"));
  EXPECT_TRUE(HasSpan(file_.service(0)));
  EXPECT_TRUE(HasSpan(file_.service(0), "name"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0)));
  EXPECT_TRUE(HasSpan(file_.service(0).options()
                      .uninterpreted_option(0)));
  EXPECT_TRUE(HasSpan(file_.service(0).options()
                      .uninterpreted_option(0), "name"));
  EXPECT_TRUE(HasSpan(file_.service(0).options()
                      .uninterpreted_option(0).name(0)));
  EXPECT_TRUE(HasSpan(file_.service(0).options()
                      .uninterpreted_option(0).name(0), "name_part"));
  EXPECT_TRUE(HasSpan(file_.service(0).options()
                      .uninterpreted_option(0), "positive_int_value"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0), "name"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0), "input_type"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0), "output_type"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0).options()
                      .uninterpreted_option(0)));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0).options()
                      .uninterpreted_option(0), "name"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0).options()
                      .uninterpreted_option(0).name(0)));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0).options()
                      .uninterpreted_option(0).name(0), "name_part"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(0).options()
                      .uninterpreted_option(0), "positive_int_value"));

  EXPECT_TRUE(HasSpan('k', 'l', file_.service(0).method(1).options()));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1)));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1), "name"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1), "input_type"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1), "output_type"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1).options()
                      .uninterpreted_option(0)));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1).options()
                      .uninterpreted_option(0), "name"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1).options()
                      .uninterpreted_option(0).name(0)));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1).options()
                      .uninterpreted_option(0).name(0), "name_part"));
  EXPECT_TRUE(HasSpan(file_.service(0).method(1).options()
                      .uninterpreted_option(0), "positive_int_value"));
  EXPECT_TRUE(HasSpan('1', '2', file_.service(0).method(1),
                      "client_streaming"));
  EXPECT_TRUE(HasSpan('3', '4', file_.service(0).method(1),
                      "server_streaming"));
}

TEST_F(SourceInfoTest, FieldOptions) {
  // The actual "name = value" pairs are parsed by the same code as for
  // top-level options so we won't re-test that -- just make sure that the
  // syntax used for field options is understood.
  EXPECT_TRUE(Parse(
      "message Foo {"
      "  optional int32 bar = 1 "
          "$a$[default=$b$123$c$,$d$opt1=123$e$,"
          "$f$opt2='hi'$g$]$h$;"
      "}\n"
  ));

  const FieldDescriptorProto& field = file_.message_type(0).field(0);
  const UninterpretedOption& option1 = field.options().uninterpreted_option(0);
  const UninterpretedOption& option2 = field.options().uninterpreted_option(1);

  EXPECT_TRUE(HasSpan('a', 'h', field.options()));
  EXPECT_TRUE(HasSpan('b', 'c', field, "default_value"));
  EXPECT_TRUE(HasSpan('d', 'e', option1));
  EXPECT_TRUE(HasSpan('f', 'g', option2));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.message_type(0)));
  EXPECT_TRUE(HasSpan(file_.message_type(0), "name"));
  EXPECT_TRUE(HasSpan(field));
  EXPECT_TRUE(HasSpan(field, "label"));
  EXPECT_TRUE(HasSpan(field, "type"));
  EXPECT_TRUE(HasSpan(field, "name"));
  EXPECT_TRUE(HasSpan(field, "number"));
  EXPECT_TRUE(HasSpan(option1, "name"));
  EXPECT_TRUE(HasSpan(option2, "name"));
  EXPECT_TRUE(HasSpan(option1.name(0)));
  EXPECT_TRUE(HasSpan(option2.name(0)));
  EXPECT_TRUE(HasSpan(option1.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option2.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option1, "positive_int_value"));
  EXPECT_TRUE(HasSpan(option2, "string_value"));
}

TEST_F(SourceInfoTest, EnumValueOptions) {
  // The actual "name = value" pairs are parsed by the same code as for
  // top-level options so we won't re-test that -- just make sure that the
  // syntax used for enum options is understood.
  EXPECT_TRUE(Parse(
      "enum Foo {"
      "  BAR = 1 $a$[$b$opt1=123$c$,$d$opt2='hi'$e$]$f$;"
      "}\n"
  ));

  const EnumValueDescriptorProto& value = file_.enum_type(0).value(0);
  const UninterpretedOption& option1 = value.options().uninterpreted_option(0);
  const UninterpretedOption& option2 = value.options().uninterpreted_option(1);

  EXPECT_TRUE(HasSpan('a', 'f', value.options()));
  EXPECT_TRUE(HasSpan('b', 'c', option1));
  EXPECT_TRUE(HasSpan('d', 'e', option2));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(file_.enum_type(0)));
  EXPECT_TRUE(HasSpan(file_.enum_type(0), "name"));
  EXPECT_TRUE(HasSpan(value));
  EXPECT_TRUE(HasSpan(value, "name"));
  EXPECT_TRUE(HasSpan(value, "number"));
  EXPECT_TRUE(HasSpan(option1, "name"));
  EXPECT_TRUE(HasSpan(option2, "name"));
  EXPECT_TRUE(HasSpan(option1.name(0)));
  EXPECT_TRUE(HasSpan(option2.name(0)));
  EXPECT_TRUE(HasSpan(option1.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option2.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(option1, "positive_int_value"));
  EXPECT_TRUE(HasSpan(option2, "string_value"));
}

TEST_F(SourceInfoTest, DocComments) {
  EXPECT_TRUE(Parse(
      "// Foo leading\n"
      "// line 2\n"
      "$a$message Foo {\n"
      "  // Foo trailing\n"
      "  // line 2\n"
      "\n"
      "  // detached\n"
      "\n"
      "  // bar leading\n"
      "  $b$optional int32 bar = 1;$c$\n"
      "  // bar trailing\n"
      "}$d$\n"
      "// ignored\n"
  ));

  const DescriptorProto& foo = file_.message_type(0);
  const FieldDescriptorProto& bar = foo.field(0);

  EXPECT_TRUE(HasSpanWithComment('a', 'd', foo,
      " Foo leading\n line 2\n",
      " Foo trailing\n line 2\n",
      NULL));
  EXPECT_TRUE(HasSpanWithComment('b', 'c', bar,
      " bar leading\n",
      " bar trailing\n",
      " detached\n"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(foo, "name"));
  EXPECT_TRUE(HasSpan(bar, "label"));
  EXPECT_TRUE(HasSpan(bar, "type"));
  EXPECT_TRUE(HasSpan(bar, "name"));
  EXPECT_TRUE(HasSpan(bar, "number"));
}

TEST_F(SourceInfoTest, DocComments2) {
  EXPECT_TRUE(Parse(
      "// detached before message.\n"
      "\n"
      "// Foo leading\n"
      "// line 2\n"
      "$a$message Foo {\n"
      "  /* Foo trailing\n"
      "   * line 2 */\n"
      "  // detached\n"
      "  /* bar leading\n"
      "   */"
      "  $b$optional int32 bar = 1;$c$  // bar trailing\n"
      "  // ignored detached\n"
      "}$d$\n"
      "// ignored\n"
      "\n"
      "// detached before option\n"
      "\n"
      "// option leading\n"
      "$e$option baz = 123;$f$\n"
      "// option trailing\n"
  ));

  const DescriptorProto& foo = file_.message_type(0);
  const FieldDescriptorProto& bar = foo.field(0);
  const UninterpretedOption& baz = file_.options().uninterpreted_option(0);

  EXPECT_TRUE(HasSpanWithComment('a', 'd', foo,
      " Foo leading\n line 2\n",
      " Foo trailing\n line 2 ",
      " detached before message.\n"));
  EXPECT_TRUE(HasSpanWithComment('b', 'c', bar,
      " bar leading\n",
      " bar trailing\n",
      " detached\n"));
  EXPECT_TRUE(HasSpanWithComment('e', 'f', baz,
      " option leading\n",
      " option trailing\n",
      " detached before option\n"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(foo, "name"));
  EXPECT_TRUE(HasSpan(bar, "label"));
  EXPECT_TRUE(HasSpan(bar, "type"));
  EXPECT_TRUE(HasSpan(bar, "name"));
  EXPECT_TRUE(HasSpan(bar, "number"));
  EXPECT_TRUE(HasSpan(file_.options()));
  EXPECT_TRUE(HasSpan(baz, "name"));
  EXPECT_TRUE(HasSpan(baz.name(0)));
  EXPECT_TRUE(HasSpan(baz.name(0), "name_part"));
  EXPECT_TRUE(HasSpan(baz, "positive_int_value"));
}

TEST_F(SourceInfoTest, DocComments3) {
  EXPECT_TRUE(Parse(
      "$a$message Foo {\n"
      "  // bar leading\n"
      "  $b$optional int32 bar = 1 [(baz.qux) = {}];$c$\n"
      "  // bar trailing\n"
      "}$d$\n"
      "// ignored\n"
  ));

  const DescriptorProto& foo = file_.message_type(0);
  const FieldDescriptorProto& bar = foo.field(0);

  EXPECT_TRUE(HasSpanWithComment('b', 'c', bar,
      " bar leading\n",
      " bar trailing\n",
      NULL));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(foo));
  EXPECT_TRUE(HasSpan(foo, "name"));
  EXPECT_TRUE(HasSpan(bar, "label"));
  EXPECT_TRUE(HasSpan(bar, "type"));
  EXPECT_TRUE(HasSpan(bar, "name"));
  EXPECT_TRUE(HasSpan(bar, "number"));
  EXPECT_TRUE(HasSpan(bar.options()));
  EXPECT_TRUE(HasSpan(bar.options().uninterpreted_option(0)));
  EXPECT_TRUE(HasSpan(bar.options().uninterpreted_option(0), "name"));
  EXPECT_TRUE(HasSpan(bar.options().uninterpreted_option(0).name(0)));
  EXPECT_TRUE(HasSpan(
      bar.options().uninterpreted_option(0).name(0), "name_part"));
  EXPECT_TRUE(HasSpan(
      bar.options().uninterpreted_option(0), "aggregate_value"));
}

TEST_F(SourceInfoTest, DocCommentsTopLevel) {
  EXPECT_TRUE(Parse(
      "// detached before syntax paragraph 1\n"
      "\n"
      "// detached before syntax paragraph 2\n"
      "\n"
      "// syntax leading\n"
      "$a$syntax = \"proto2\";$b$\n"
      "// syntax trailing\n"
      "\n"
      "// syntax-package detached comments\n"
      "\n"
      ";\n"
      "\n"
      "// detached after empty before package\n"
      "\n"
      "// package leading\n"
      "package $c$foo$d$;\n"
      "// package trailing\n"
      "\n"
      "// ignored detach\n"
      "\n"));

  EXPECT_TRUE(HasSpan('a', 'b', file_, "syntax", -1,
      " syntax leading\n",
      " syntax trailing\n",
      " detached before syntax paragraph 1\n"
      "\n"
      " detached before syntax paragraph 2\n"));
  EXPECT_TRUE(HasSpan('c', 'd', file_, "package", -1,
      " package leading\n",
      " package trailing\n",
      " syntax-package detached comments\n"
      "\n"
      " detached after empty before package\n"));

  // ignore these.
  EXPECT_TRUE(HasSpan(file_));
}

TEST_F(SourceInfoTest, DocCommentsOneof) {
  EXPECT_TRUE(Parse(
      "// Foo leading\n"
      "$a$message Foo {\n"
      "  /* Foo trailing\n"
      "   */\n"
      "  // detached before oneof\n"
      "  /* bar leading\n"
      "   * line 2 */\n"
      "  $b$oneof bar {\n"
      "  /* bar trailing\n"
      "   * line 2 */\n"
      "  // detached before bar_int\n"
      "  /* bar_int leading\n"
      "   */\n"
      "  $c$int32 bar_int = 1;$d$  // bar_int trailing\n"
      "  // detach comment ignored\n"
      "  }$e$\n"
      "}$f$\n"));

  const DescriptorProto& foo = file_.message_type(0);
  const OneofDescriptorProto& bar = foo.oneof_decl(0);
  const FieldDescriptorProto& bar_int = foo.field(0);

  EXPECT_TRUE(HasSpanWithComment('a', 'f', foo,
      " Foo leading\n",
      " Foo trailing\n",
      NULL));
  EXPECT_TRUE(HasSpanWithComment('b', 'e', bar,
      " bar leading\n line 2 ",
      " bar trailing\n line 2 ",
      " detached before oneof\n"));
  EXPECT_TRUE(HasSpanWithComment('c', 'd', bar_int,
      " bar_int leading\n",
      " bar_int trailing\n",
      " detached before bar_int\n"));

  // Ignore these.
  EXPECT_TRUE(HasSpan(file_));
  EXPECT_TRUE(HasSpan(foo, "name"));
  EXPECT_TRUE(HasSpan(bar, "name"));
  EXPECT_TRUE(HasSpan(bar_int, "type"));
  EXPECT_TRUE(HasSpan(bar_int, "name"));
  EXPECT_TRUE(HasSpan(bar_int, "number"));
}

// ===================================================================

}  // anonymous namespace

}  // namespace compiler
}  // namespace protobuf
}  // namespace google