src/google/protobuf/compiler/python/python_plugin_unittest.cc

// Protocol Buffers - Google's data interchange format
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// Author: kenton@google.com (Kenton Varda)
//
// TODO(kenton):  Share code with the versions of this test in other languages?
//   It seemed like parameterizing it would add more complexity than it is
//   worth.

#include <google/protobuf/compiler/python/python_generator.h>
#include <google/protobuf/compiler/command_line_interface.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/io/printer.h>

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

namespace google {
namespace protobuf {
namespace compiler {
namespace python {
namespace {

class TestGenerator : public CodeGenerator {
 public:
  TestGenerator() {}
  ~TestGenerator() {}

  virtual bool Generate(const FileDescriptor* file,
                        const string& parameter,
                        GeneratorContext* context,
                        string* error) const {
    TryInsert("test_pb2.py", "imports", context);
    TryInsert("test_pb2.py", "module_scope", context);
    TryInsert("test_pb2.py", "class_scope:foo.Bar", context);
    TryInsert("test_pb2.py", "class_scope:foo.Bar.Baz", context);
    return true;
  }

  void TryInsert(const string& filename, const string& insertion_point,
                 GeneratorContext* context) const {
    scoped_ptr<io::ZeroCopyOutputStream> output(
      context->OpenForInsert(filename, insertion_point));
    io::Printer printer(output.get(), '$');
    printer.Print("// inserted $name$\n", "name", insertion_point);
  }
};

// This test verifies that all the expected insertion points exist.  It does
// not verify that they are correctly-placed; that would require actually
// compiling the output which is a bit more than I care to do for this test.
TEST(PythonPluginTest, PluginTest) {
  File::WriteStringToFileOrDie(
      "syntax = \"proto2\";\n"
      "package foo;\n"
      "message Bar {\n"
      "  message Baz {}\n"
      "}\n",
      TestTempDir() + "/test.proto");

  google::protobuf::compiler::CommandLineInterface cli;
  cli.SetInputsAreProtoPathRelative(true);

  python::Generator python_generator;
  TestGenerator test_generator;
  cli.RegisterGenerator("--python_out", &python_generator, "");
  cli.RegisterGenerator("--test_out", &test_generator, "");

  string proto_path = "-I" + TestTempDir();
  string python_out = "--python_out=" + TestTempDir();
  string test_out = "--test_out=" + TestTempDir();

  const char* argv[] = {
    "protoc",
    proto_path.c_str(),
    python_out.c_str(),
    test_out.c_str(),
    "test.proto"
  };

  EXPECT_EQ(0, cli.Run(5, argv));
}

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