| // 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. |
| // |
| // Implements the Protocol Compiler front-end such that it may be reused by |
| // custom compilers written to support other languages. |
| |
| #ifndef GOOGLE_PROTOBUF_COMPILER_COMMAND_LINE_INTERFACE_H__ |
| #define GOOGLE_PROTOBUF_COMPILER_COMMAND_LINE_INTERFACE_H__ |
| |
| #include <google/protobuf/stubs/common.h> |
| #include <string> |
| #include <vector> |
| #include <map> |
| #include <set> |
| #include <utility> |
| |
| namespace google { |
| namespace protobuf { |
| |
| class Descriptor; // descriptor.h |
| class DescriptorPool; // descriptor.h |
| class FileDescriptor; // descriptor.h |
| class FileDescriptorProto; // descriptor.pb.h |
| template<typename T> class RepeatedPtrField; // repeated_field.h |
| |
| namespace compiler { |
| |
| class CodeGenerator; // code_generator.h |
| class GeneratorContext; // code_generator.h |
| class DiskSourceTree; // importer.h |
| |
| // This class implements the command-line interface to the protocol compiler. |
| // It is designed to make it very easy to create a custom protocol compiler |
| // supporting the languages of your choice. For example, if you wanted to |
| // create a custom protocol compiler binary which includes both the regular |
| // C++ support plus support for your own custom output "Foo", you would |
| // write a class "FooGenerator" which implements the CodeGenerator interface, |
| // then write a main() procedure like this: |
| // |
| // int main(int argc, char* argv[]) { |
| // google::protobuf::compiler::CommandLineInterface cli; |
| // |
| // // Support generation of C++ source and headers. |
| // google::protobuf::compiler::cpp::CppGenerator cpp_generator; |
| // cli.RegisterGenerator("--cpp_out", &cpp_generator, |
| // "Generate C++ source and header."); |
| // |
| // // Support generation of Foo code. |
| // FooGenerator foo_generator; |
| // cli.RegisterGenerator("--foo_out", &foo_generator, |
| // "Generate Foo file."); |
| // |
| // return cli.Run(argc, argv); |
| // } |
| // |
| // The compiler is invoked with syntax like: |
| // protoc --cpp_out=outdir --foo_out=outdir --proto_path=src src/foo.proto |
| // |
| // For a full description of the command-line syntax, invoke it with --help. |
| class LIBPROTOC_EXPORT CommandLineInterface { |
| public: |
| CommandLineInterface(); |
| ~CommandLineInterface(); |
| |
| // Register a code generator for a language. |
| // |
| // Parameters: |
| // * flag_name: The command-line flag used to specify an output file of |
| // this type. The name must start with a '-'. If the name is longer |
| // than one letter, it must start with two '-'s. |
| // * generator: The CodeGenerator which will be called to generate files |
| // of this type. |
| // * help_text: Text describing this flag in the --help output. |
| // |
| // Some generators accept extra parameters. You can specify this parameter |
| // on the command-line by placing it before the output directory, separated |
| // by a colon: |
| // protoc --foo_out=enable_bar:outdir |
| // The text before the colon is passed to CodeGenerator::Generate() as the |
| // "parameter". |
| void RegisterGenerator(const string& flag_name, |
| CodeGenerator* generator, |
| const string& help_text); |
| |
| // Register a code generator for a language. |
| // Besides flag_name you can specify another option_flag_name that could be |
| // used to pass extra parameters to the registered code generator. |
| // Suppose you have registered a generator by calling: |
| // command_line_interface.RegisterGenerator("--foo_out", "--foo_opt", ...) |
| // Then you could invoke the compiler with a command like: |
| // protoc --foo_out=enable_bar:outdir --foo_opt=enable_baz |
| // This will pass "enable_bar,enable_baz" as the parameter to the generator. |
| void RegisterGenerator(const string& flag_name, |
| const string& option_flag_name, |
| CodeGenerator* generator, |
| const string& help_text); |
| |
| // Enables "plugins". In this mode, if a command-line flag ends with "_out" |
| // but does not match any registered generator, the compiler will attempt to |
| // find a "plugin" to implement the generator. Plugins are just executables. |
| // They should live somewhere in the PATH. |
| // |
| // The compiler determines the executable name to search for by concatenating |
| // exe_name_prefix with the unrecognized flag name, removing "_out". So, for |
| // example, if exe_name_prefix is "protoc-" and you pass the flag --foo_out, |
| // the compiler will try to run the program "protoc-foo". |
| // |
| // The plugin program should implement the following usage: |
| // plugin [--out=OUTDIR] [--parameter=PARAMETER] PROTO_FILES < DESCRIPTORS |
| // --out indicates the output directory (as passed to the --foo_out |
| // parameter); if omitted, the current directory should be used. --parameter |
| // gives the generator parameter, if any was provided. The PROTO_FILES list |
| // the .proto files which were given on the compiler command-line; these are |
| // the files for which the plugin is expected to generate output code. |
| // Finally, DESCRIPTORS is an encoded FileDescriptorSet (as defined in |
| // descriptor.proto). This is piped to the plugin's stdin. The set will |
| // include descriptors for all the files listed in PROTO_FILES as well as |
| // all files that they import. The plugin MUST NOT attempt to read the |
| // PROTO_FILES directly -- it must use the FileDescriptorSet. |
| // |
| // The plugin should generate whatever files are necessary, as code generators |
| // normally do. It should write the names of all files it generates to |
| // stdout. The names should be relative to the output directory, NOT absolute |
| // names or relative to the current directory. If any errors occur, error |
| // messages should be written to stderr. If an error is fatal, the plugin |
| // should exit with a non-zero exit code. |
| void AllowPlugins(const string& exe_name_prefix); |
| |
| // Run the Protocol Compiler with the given command-line parameters. |
| // Returns the error code which should be returned by main(). |
| // |
| // It may not be safe to call Run() in a multi-threaded environment because |
| // it calls strerror(). I'm not sure why you'd want to do this anyway. |
| int Run(int argc, const char* const argv[]); |
| |
| // Call SetInputsAreCwdRelative(true) if the input files given on the command |
| // line should be interpreted relative to the proto import path specified |
| // using --proto_path or -I flags. Otherwise, input file names will be |
| // interpreted relative to the current working directory (or as absolute |
| // paths if they start with '/'), though they must still reside inside |
| // a directory given by --proto_path or the compiler will fail. The latter |
| // mode is generally more intuitive and easier to use, especially e.g. when |
| // defining implicit rules in Makefiles. |
| void SetInputsAreProtoPathRelative(bool enable) { |
| inputs_are_proto_path_relative_ = enable; |
| } |
| |
| // Provides some text which will be printed when the --version flag is |
| // used. The version of libprotoc will also be printed on the next line |
| // after this text. |
| void SetVersionInfo(const string& text) { |
| version_info_ = text; |
| } |
| |
| |
| private: |
| // ----------------------------------------------------------------- |
| |
| class ErrorPrinter; |
| class GeneratorContextImpl; |
| class MemoryOutputStream; |
| |
| // Clear state from previous Run(). |
| void Clear(); |
| |
| // Remaps each file in input_files_ so that it is relative to one of the |
| // directories in proto_path_. Returns false if an error occurred. This |
| // is only used if inputs_are_proto_path_relative_ is false. |
| bool MakeInputsBeProtoPathRelative( |
| DiskSourceTree* source_tree); |
| |
| // Return status for ParseArguments() and InterpretArgument(). |
| enum ParseArgumentStatus { |
| PARSE_ARGUMENT_DONE_AND_CONTINUE, |
| PARSE_ARGUMENT_DONE_AND_EXIT, |
| PARSE_ARGUMENT_FAIL |
| }; |
| |
| // Parse all command-line arguments. |
| ParseArgumentStatus ParseArguments(int argc, const char* const argv[]); |
| |
| // Parses a command-line argument into a name/value pair. Returns |
| // true if the next argument in the argv should be used as the value, |
| // false otherwise. |
| // |
| // Examples: |
| // "-Isrc/protos" -> |
| // name = "-I", value = "src/protos" |
| // "--cpp_out=src/foo.pb2.cc" -> |
| // name = "--cpp_out", value = "src/foo.pb2.cc" |
| // "foo.proto" -> |
| // name = "", value = "foo.proto" |
| bool ParseArgument(const char* arg, string* name, string* value); |
| |
| // Interprets arguments parsed with ParseArgument. |
| ParseArgumentStatus InterpretArgument(const string& name, |
| const string& value); |
| |
| // Print the --help text to stderr. |
| void PrintHelpText(); |
| |
| // Generate the given output file from the given input. |
| struct OutputDirective; // see below |
| bool GenerateOutput(const vector<const FileDescriptor*>& parsed_files, |
| const OutputDirective& output_directive, |
| GeneratorContext* generator_context); |
| bool GeneratePluginOutput(const vector<const FileDescriptor*>& parsed_files, |
| const string& plugin_name, |
| const string& parameter, |
| GeneratorContext* generator_context, |
| string* error); |
| |
| // Implements --encode and --decode. |
| bool EncodeOrDecode(const DescriptorPool* pool); |
| |
| // Implements the --descriptor_set_out option. |
| bool WriteDescriptorSet(const vector<const FileDescriptor*> parsed_files); |
| |
| // Get all transitive dependencies of the given file (including the file |
| // itself), adding them to the given list of FileDescriptorProtos. The |
| // protos will be ordered such that every file is listed before any file that |
| // depends on it, so that you can call DescriptorPool::BuildFile() on them |
| // in order. Any files in *already_seen will not be added, and each file |
| // added will be inserted into *already_seen. If include_source_code_info is |
| // true then include the source code information in the FileDescriptorProtos. |
| static void GetTransitiveDependencies( |
| const FileDescriptor* file, |
| bool include_source_code_info, |
| set<const FileDescriptor*>* already_seen, |
| RepeatedPtrField<FileDescriptorProto>* output); |
| |
| // Implements the --print_free_field_numbers. This function prints free field |
| // numbers into stdout for the message and it's nested message types in |
| // post-order, i.e. nested types first. Printed range are left-right |
| // inclusive, i.e. [a, b]. |
| // |
| // Groups: |
| // For historical reasons, groups are considered to share the same |
| // field number space with the parent message, thus it will not print free |
| // field numbers for groups. The field numbers used in the groups are |
| // excluded in the free field numbers of the parent message. |
| // |
| // Extension Ranges: |
| // Extension ranges are considered ocuppied field numbers and they will not be |
| // listed as free numbers in the output. |
| void PrintFreeFieldNumbers(const Descriptor* descriptor); |
| |
| // ----------------------------------------------------------------- |
| |
| // The name of the executable as invoked (i.e. argv[0]). |
| string executable_name_; |
| |
| // Version info set with SetVersionInfo(). |
| string version_info_; |
| |
| // Registered generators. |
| struct GeneratorInfo { |
| string flag_name; |
| string option_flag_name; |
| CodeGenerator* generator; |
| string help_text; |
| }; |
| typedef map<string, GeneratorInfo> GeneratorMap; |
| GeneratorMap generators_by_flag_name_; |
| GeneratorMap generators_by_option_name_; |
| // A map from generator names to the parameters specified using the option |
| // flag. For example, if the user invokes the compiler with: |
| // protoc --foo_out=outputdir --foo_opt=enable_bar ... |
| // Then there will be an entry ("--foo_out", "enable_bar") in this map. |
| map<string, string> generator_parameters_; |
| |
| // See AllowPlugins(). If this is empty, plugins aren't allowed. |
| string plugin_prefix_; |
| |
| // Maps specific plugin names to files. When executing a plugin, this map |
| // is searched first to find the plugin executable. If not found here, the |
| // PATH (or other OS-specific search strategy) is searched. |
| map<string, string> plugins_; |
| |
| // Stuff parsed from command line. |
| enum Mode { |
| MODE_COMPILE, // Normal mode: parse .proto files and compile them. |
| MODE_ENCODE, // --encode: read text from stdin, write binary to stdout. |
| MODE_DECODE, // --decode: read binary from stdin, write text to stdout. |
| MODE_PRINT, // Print mode: print info of the given .proto files and exit. |
| }; |
| |
| Mode mode_; |
| |
| enum PrintMode { |
| PRINT_NONE, // Not in MODE_PRINT |
| PRINT_FREE_FIELDS, // --print_free_fields |
| }; |
| |
| PrintMode print_mode_; |
| |
| enum ErrorFormat { |
| ERROR_FORMAT_GCC, // GCC error output format (default). |
| ERROR_FORMAT_MSVS // Visual Studio output (--error_format=msvs). |
| }; |
| |
| ErrorFormat error_format_; |
| |
| vector<pair<string, string> > proto_path_; // Search path for proto files. |
| vector<string> input_files_; // Names of the input proto files. |
| |
| // output_directives_ lists all the files we are supposed to output and what |
| // generator to use for each. |
| struct OutputDirective { |
| string name; // E.g. "--foo_out" |
| CodeGenerator* generator; // NULL for plugins |
| string parameter; |
| string output_location; |
| }; |
| vector<OutputDirective> output_directives_; |
| |
| // When using --encode or --decode, this names the type we are encoding or |
| // decoding. (Empty string indicates --decode_raw.) |
| string codec_type_; |
| |
| // If --descriptor_set_out was given, this is the filename to which the |
| // FileDescriptorSet should be written. Otherwise, empty. |
| string descriptor_set_name_; |
| |
| // True if --include_imports was given, meaning that we should |
| // write all transitive dependencies to the DescriptorSet. Otherwise, only |
| // the .proto files listed on the command-line are added. |
| bool imports_in_descriptor_set_; |
| |
| // True if --include_source_info was given, meaning that we should not strip |
| // SourceCodeInfo from the DescriptorSet. |
| bool source_info_in_descriptor_set_; |
| |
| // Was the --disallow_services flag used? |
| bool disallow_services_; |
| |
| // See SetInputsAreProtoPathRelative(). |
| bool inputs_are_proto_path_relative_; |
| |
| GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(CommandLineInterface); |
| }; |
| |
| } // namespace compiler |
| } // namespace protobuf |
| |
| } // namespace google |
| #endif // GOOGLE_PROTOBUF_COMPILER_COMMAND_LINE_INTERFACE_H__ |