490 lines
22 KiB
C++
490 lines
22 KiB
C++
/*
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* Copyright 2014 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "flatbuffers/flatc.h"
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#include <list>
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namespace flatbuffers {
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const char *FLATC_VERSION() { return FLATBUFFERS_VERSION(); }
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void FlatCompiler::ParseFile(
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flatbuffers::Parser &parser, const std::string &filename,
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const std::string &contents,
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std::vector<const char *> &include_directories) const {
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auto local_include_directory = flatbuffers::StripFileName(filename);
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include_directories.push_back(local_include_directory.c_str());
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include_directories.push_back(nullptr);
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if (!parser.Parse(contents.c_str(), &include_directories[0],
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filename.c_str())) {
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Error(parser.error_, false, false);
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}
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if (!parser.error_.empty()) { Warn(parser.error_, false); }
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include_directories.pop_back();
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include_directories.pop_back();
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}
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void FlatCompiler::LoadBinarySchema(flatbuffers::Parser &parser,
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const std::string &filename,
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const std::string &contents) {
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if (!parser.Deserialize(reinterpret_cast<const uint8_t *>(contents.c_str()),
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contents.size())) {
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Error("failed to load binary schema: " + filename, false, false);
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}
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}
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void FlatCompiler::Warn(const std::string &warn, bool show_exe_name) const {
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params_.warn_fn(this, warn, show_exe_name);
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}
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void FlatCompiler::Error(const std::string &err, bool usage,
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bool show_exe_name) const {
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params_.error_fn(this, err, usage, show_exe_name);
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}
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std::string FlatCompiler::GetUsageString(const char *program_name) const {
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std::stringstream ss;
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ss << "Usage: " << program_name << " [OPTION]... FILE... [-- FILE...]\n";
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for (size_t i = 0; i < params_.num_generators; ++i) {
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const Generator &g = params_.generators[i];
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std::stringstream full_name;
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full_name << std::setw(12) << std::left << g.generator_opt_long;
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const char *name = g.generator_opt_short ? g.generator_opt_short : " ";
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const char *help = g.generator_help;
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ss << " " << full_name.str() << " " << name << " " << help << ".\n";
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}
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// clang-format off
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ss <<
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" -o PATH Prefix PATH to all generated files.\n"
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" -I PATH Search for includes in the specified path.\n"
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" -M Print make rules for generated files.\n"
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" --version Print the version number of flatc and exit.\n"
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" --strict-json Strict JSON: field names must be / will be quoted,\n"
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" no trailing commas in tables/vectors.\n"
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" --allow-non-utf8 Pass non-UTF-8 input through parser and emit nonstandard\n"
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" \\x escapes in JSON. (Default is to raise parse error on\n"
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" non-UTF-8 input.)\n"
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" --natural-utf8 Output strings with UTF-8 as human-readable strings.\n"
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" By default, UTF-8 characters are printed as \\uXXXX escapes.\n"
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" --defaults-json Output fields whose value is the default when\n"
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" writing JSON\n"
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" --unknown-json Allow fields in JSON that are not defined in the\n"
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" schema. These fields will be discared when generating\n"
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" binaries.\n"
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" --no-prefix Don\'t prefix enum values with the enum type in C++.\n"
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" --scoped-enums Use C++11 style scoped and strongly typed enums.\n"
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" also implies --no-prefix.\n"
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" --gen-includes (deprecated), this is the default behavior.\n"
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" If the original behavior is required (no include\n"
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" statements) use --no-includes.\n"
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" --no-includes Don\'t generate include statements for included\n"
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" schemas the generated file depends on (C++).\n"
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" --gen-mutable Generate accessors that can mutate buffers in-place.\n"
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" --gen-onefile Generate single output file for C# and Go.\n"
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" --gen-name-strings Generate type name functions for C++.\n"
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" --gen-object-api Generate an additional object-based API.\n"
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" --gen-compare Generate operator== for object-based API types.\n"
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" --gen-nullable Add Clang _Nullable for C++ pointer. or @Nullable for Java\n"
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" --gen-generated Add @Generated annotation for Java\n"
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" --gen-all Generate not just code for the current schema files,\n"
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" but for all files it includes as well.\n"
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" If the language uses a single file for output (by default\n"
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" the case for C++ and JS), all code will end up in this one\n"
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" file.\n"
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" --cpp-include Adds an #include in generated file.\n"
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" --cpp-ptr-type T Set object API pointer type (default std::unique_ptr).\n"
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" --cpp-str-type T Set object API string type (default std::string).\n"
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" T::c_str(), T::length() and T::empty() must be supported.\n"
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" The custom type also needs to be constructible from std::string\n"
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" (see the --cpp-str-flex-ctor option to change this behavior).\n"
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" --cpp-str-flex-ctor Don't construct custom string types by passing std::string\n"
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" from Flatbuffers, but (char* + length).\n"
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" --object-prefix Customise class prefix for C++ object-based API.\n"
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" --object-suffix Customise class suffix for C++ object-based API.\n"
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" Default value is \"T\".\n"
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" --no-js-exports Removes Node.js style export lines in JS.\n"
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" --goog-js-export Uses goog.exports* for closure compiler exporting in JS.\n"
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" --es6-js-export Uses ECMAScript 6 export style lines in JS.\n"
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" --go-namespace Generate the overrided namespace in Golang.\n"
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" --go-import Generate the overrided import for flatbuffers in Golang\n"
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" (default is \"github.com/google/flatbuffers/go\").\n"
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" --raw-binary Allow binaries without file_indentifier to be read.\n"
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" This may crash flatc given a mismatched schema.\n"
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" --size-prefixed Input binaries are size prefixed buffers.\n"
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" --proto Input is a .proto, translate to .fbs.\n"
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" --oneof-union Translate .proto oneofs to flatbuffer unions.\n"
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" --grpc Generate GRPC interfaces for the specified languages.\n"
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" --schema Serialize schemas instead of JSON (use with -b).\n"
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" --bfbs-comments Add doc comments to the binary schema files.\n"
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" --bfbs-builtins Add builtin attributes to the binary schema files.\n"
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" --conform FILE Specify a schema the following schemas should be\n"
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" an evolution of. Gives errors if not.\n"
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" --conform-includes Include path for the schema given with --conform PATH\n"
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" --include-prefix Prefix this path to any generated include statements.\n"
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" PATH\n"
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" --keep-prefix Keep original prefix of schema include statement.\n"
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" --no-fb-import Don't include flatbuffers import statement for TypeScript.\n"
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" --no-ts-reexport Don't re-export imported dependencies for TypeScript.\n"
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" --short-names Use short function names for JS and TypeScript.\n"
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" --reflect-types Add minimal type reflection to code generation.\n"
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" --reflect-names Add minimal type/name reflection.\n"
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" --root-type T Select or override the default root_type\n"
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" --force-defaults Emit default values in binary output from JSON\n"
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" --force-empty When serializing from object API representation,\n"
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" force strings and vectors to empty rather than null.\n"
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"FILEs may be schemas (must end in .fbs), binary schemas (must end in .bfbs),\n"
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"or JSON files (conforming to preceding schema). FILEs after the -- must be\n"
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"binary flatbuffer format files.\n"
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"Output files are named using the base file name of the input,\n"
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"and written to the current directory or the path given by -o.\n"
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"example: " << program_name << " -c -b schema1.fbs schema2.fbs data.json\n";
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// clang-format on
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return ss.str();
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}
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int FlatCompiler::Compile(int argc, const char **argv) {
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if (params_.generators == nullptr || params_.num_generators == 0) {
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return 0;
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}
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flatbuffers::IDLOptions opts;
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std::string output_path;
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bool any_generator = false;
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bool print_make_rules = false;
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bool raw_binary = false;
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bool schema_binary = false;
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bool grpc_enabled = false;
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std::vector<std::string> filenames;
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std::list<std::string> include_directories_storage;
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std::vector<const char *> include_directories;
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std::vector<const char *> conform_include_directories;
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std::vector<bool> generator_enabled(params_.num_generators, false);
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size_t binary_files_from = std::numeric_limits<size_t>::max();
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std::string conform_to_schema;
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for (int argi = 0; argi < argc; argi++) {
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std::string arg = argv[argi];
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if (arg[0] == '-') {
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if (filenames.size() && arg[1] != '-')
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Error("invalid option location: " + arg, true);
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if (arg == "-o") {
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if (++argi >= argc) Error("missing path following: " + arg, true);
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output_path = flatbuffers::ConCatPathFileName(
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flatbuffers::PosixPath(argv[argi]), "");
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} else if (arg == "-I") {
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if (++argi >= argc) Error("missing path following" + arg, true);
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include_directories_storage.push_back(
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flatbuffers::PosixPath(argv[argi]));
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include_directories.push_back(
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include_directories_storage.back().c_str());
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} else if (arg == "--conform") {
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if (++argi >= argc) Error("missing path following" + arg, true);
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conform_to_schema = flatbuffers::PosixPath(argv[argi]);
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} else if (arg == "--conform-includes") {
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if (++argi >= argc) Error("missing path following" + arg, true);
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include_directories_storage.push_back(
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flatbuffers::PosixPath(argv[argi]));
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conform_include_directories.push_back(
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include_directories_storage.back().c_str());
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} else if (arg == "--include-prefix") {
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if (++argi >= argc) Error("missing path following" + arg, true);
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opts.include_prefix = flatbuffers::ConCatPathFileName(
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flatbuffers::PosixPath(argv[argi]), "");
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} else if (arg == "--keep-prefix") {
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opts.keep_include_path = true;
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} else if (arg == "--strict-json") {
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opts.strict_json = true;
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} else if (arg == "--allow-non-utf8") {
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opts.allow_non_utf8 = true;
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} else if (arg == "--natural-utf8") {
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opts.natural_utf8 = true;
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} else if (arg == "--no-js-exports") {
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opts.skip_js_exports = true;
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} else if (arg == "--goog-js-export") {
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opts.use_goog_js_export_format = true;
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opts.use_ES6_js_export_format = false;
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} else if (arg == "--es6-js-export") {
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opts.use_goog_js_export_format = false;
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opts.use_ES6_js_export_format = true;
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} else if (arg == "--go-namespace") {
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if (++argi >= argc) Error("missing golang namespace" + arg, true);
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opts.go_namespace = argv[argi];
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} else if (arg == "--go-import") {
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if (++argi >= argc) Error("missing golang import" + arg, true);
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opts.go_import = argv[argi];
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} else if (arg == "--defaults-json") {
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opts.output_default_scalars_in_json = true;
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} else if (arg == "--unknown-json") {
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opts.skip_unexpected_fields_in_json = true;
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} else if (arg == "--no-prefix") {
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opts.prefixed_enums = false;
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} else if (arg == "--scoped-enums") {
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opts.prefixed_enums = false;
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opts.scoped_enums = true;
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} else if (arg == "--no-union-value-namespacing") {
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opts.union_value_namespacing = false;
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} else if (arg == "--gen-mutable") {
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opts.mutable_buffer = true;
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} else if (arg == "--gen-name-strings") {
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opts.generate_name_strings = true;
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} else if (arg == "--gen-object-api") {
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opts.generate_object_based_api = true;
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} else if (arg == "--gen-compare") {
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opts.gen_compare = true;
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} else if (arg == "--cpp-include") {
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if (++argi >= argc) Error("missing include following" + arg, true);
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opts.cpp_includes.push_back(argv[argi]);
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} else if (arg == "--cpp-ptr-type") {
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if (++argi >= argc) Error("missing type following" + arg, true);
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opts.cpp_object_api_pointer_type = argv[argi];
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} else if (arg == "--cpp-str-type") {
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if (++argi >= argc) Error("missing type following" + arg, true);
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opts.cpp_object_api_string_type = argv[argi];
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} else if (arg == "--cpp-str-flex-ctor") {
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opts.cpp_object_api_string_flexible_constructor = true;
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} else if (arg == "--gen-nullable") {
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opts.gen_nullable = true;
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} else if (arg == "--gen-generated") {
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opts.gen_generated = true;
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} else if (arg == "--object-prefix") {
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if (++argi >= argc) Error("missing prefix following" + arg, true);
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opts.object_prefix = argv[argi];
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} else if (arg == "--object-suffix") {
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if (++argi >= argc) Error("missing suffix following" + arg, true);
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opts.object_suffix = argv[argi];
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} else if (arg == "--gen-all") {
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opts.generate_all = true;
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opts.include_dependence_headers = false;
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} else if (arg == "--gen-includes") {
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// Deprecated, remove this option some time in the future.
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printf("warning: --gen-includes is deprecated (it is now default)\n");
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} else if (arg == "--no-includes") {
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opts.include_dependence_headers = false;
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} else if (arg == "--gen-onefile") {
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opts.one_file = true;
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} else if (arg == "--raw-binary") {
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raw_binary = true;
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} else if (arg == "--size-prefixed") {
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opts.size_prefixed = true;
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} else if (arg == "--") { // Separator between text and binary inputs.
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binary_files_from = filenames.size();
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} else if (arg == "--proto") {
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opts.proto_mode = true;
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} else if (arg == "--oneof-union") {
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opts.proto_oneof_union = true;
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} else if (arg == "--schema") {
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schema_binary = true;
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} else if (arg == "-M") {
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print_make_rules = true;
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} else if (arg == "--version") {
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printf("flatc version %s\n", FLATC_VERSION());
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exit(0);
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} else if (arg == "--grpc") {
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grpc_enabled = true;
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} else if (arg == "--bfbs-comments") {
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opts.binary_schema_comments = true;
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} else if (arg == "--bfbs-builtins") {
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opts.binary_schema_builtins = true;
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} else if (arg == "--no-fb-import") {
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opts.skip_flatbuffers_import = true;
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} else if (arg == "--no-ts-reexport") {
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opts.reexport_ts_modules = false;
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} else if (arg == "--short-names") {
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opts.js_ts_short_names = true;
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} else if (arg == "--reflect-types") {
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opts.mini_reflect = IDLOptions::kTypes;
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} else if (arg == "--reflect-names") {
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opts.mini_reflect = IDLOptions::kTypesAndNames;
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} else if (arg == "--root-type") {
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if (++argi >= argc) Error("missing type following" + arg, true);
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opts.root_type = argv[argi];
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} else if (arg == "--force-defaults") {
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opts.force_defaults = true;
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} else if (arg == "--force-empty") {
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opts.set_empty_to_null = false;
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} else {
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for (size_t i = 0; i < params_.num_generators; ++i) {
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if (arg == params_.generators[i].generator_opt_long ||
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(params_.generators[i].generator_opt_short &&
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arg == params_.generators[i].generator_opt_short)) {
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generator_enabled[i] = true;
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any_generator = true;
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opts.lang_to_generate |= params_.generators[i].lang;
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goto found;
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}
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}
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Error("unknown commandline argument: " + arg, true);
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found:;
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}
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} else {
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filenames.push_back(flatbuffers::PosixPath(argv[argi]));
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}
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}
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if (!filenames.size()) Error("missing input files", false, true);
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if (opts.proto_mode) {
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if (any_generator)
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Error("cannot generate code directly from .proto files", true);
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} else if (!any_generator && conform_to_schema.empty()) {
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Error("no options: specify at least one generator.", true);
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}
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flatbuffers::Parser conform_parser;
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if (!conform_to_schema.empty()) {
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std::string contents;
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if (!flatbuffers::LoadFile(conform_to_schema.c_str(), true, &contents))
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Error("unable to load schema: " + conform_to_schema);
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if (flatbuffers::GetExtension(conform_to_schema) ==
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reflection::SchemaExtension()) {
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LoadBinarySchema(conform_parser, conform_to_schema, contents);
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} else {
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ParseFile(conform_parser, conform_to_schema, contents,
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conform_include_directories);
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}
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}
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std::unique_ptr<flatbuffers::Parser> parser(new flatbuffers::Parser(opts));
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for (auto file_it = filenames.begin(); file_it != filenames.end();
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++file_it) {
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auto &filename = *file_it;
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std::string contents;
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if (!flatbuffers::LoadFile(filename.c_str(), true, &contents))
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Error("unable to load file: " + filename);
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bool is_binary =
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static_cast<size_t>(file_it - filenames.begin()) >= binary_files_from;
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auto ext = flatbuffers::GetExtension(filename);
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auto is_schema = ext == "fbs" || ext == "proto";
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auto is_binary_schema = ext == reflection::SchemaExtension();
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if (is_binary) {
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parser->builder_.Clear();
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parser->builder_.PushFlatBuffer(
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reinterpret_cast<const uint8_t *>(contents.c_str()),
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contents.length());
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if (!raw_binary) {
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// Generally reading binaries that do not correspond to the schema
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// will crash, and sadly there's no way around that when the binary
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// does not contain a file identifier.
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// We'd expect that typically any binary used as a file would have
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// such an identifier, so by default we require them to match.
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if (!parser->file_identifier_.length()) {
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Error("current schema has no file_identifier: cannot test if \"" +
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filename +
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"\" matches the schema, use --raw-binary to read this file"
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" anyway.");
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} else if (!flatbuffers::BufferHasIdentifier(
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contents.c_str(), parser->file_identifier_.c_str(), opts.size_prefixed)) {
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Error("binary \"" + filename +
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"\" does not have expected file_identifier \"" +
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parser->file_identifier_ +
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"\", use --raw-binary to read this file anyway.");
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}
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}
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} else {
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// Check if file contains 0 bytes.
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if (!is_binary_schema && contents.length() != strlen(contents.c_str())) {
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Error("input file appears to be binary: " + filename, true);
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}
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if (is_schema) {
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// If we're processing multiple schemas, make sure to start each
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// one from scratch. If it depends on previous schemas it must do
|
|
// so explicitly using an include.
|
|
parser.reset(new flatbuffers::Parser(opts));
|
|
}
|
|
if (is_binary_schema) {
|
|
LoadBinarySchema(*parser.get(), filename, contents);
|
|
} else {
|
|
ParseFile(*parser.get(), filename, contents, include_directories);
|
|
if (!is_schema && !parser->builder_.GetSize()) {
|
|
// If a file doesn't end in .fbs, it must be json/binary. Ensure we
|
|
// didn't just parse a schema with a different extension.
|
|
Error("input file is neither json nor a .fbs (schema) file: " +
|
|
filename,
|
|
true);
|
|
}
|
|
}
|
|
if ((is_schema || is_binary_schema) && !conform_to_schema.empty()) {
|
|
auto err = parser->ConformTo(conform_parser);
|
|
if (!err.empty()) Error("schemas don\'t conform: " + err);
|
|
}
|
|
if (schema_binary) {
|
|
parser->Serialize();
|
|
parser->file_extension_ = reflection::SchemaExtension();
|
|
}
|
|
}
|
|
|
|
std::string filebase =
|
|
flatbuffers::StripPath(flatbuffers::StripExtension(filename));
|
|
|
|
for (size_t i = 0; i < params_.num_generators; ++i) {
|
|
parser->opts.lang = params_.generators[i].lang;
|
|
if (generator_enabled[i]) {
|
|
if (!print_make_rules) {
|
|
flatbuffers::EnsureDirExists(output_path);
|
|
if ((!params_.generators[i].schema_only ||
|
|
(is_schema || is_binary_schema)) &&
|
|
!params_.generators[i].generate(*parser.get(), output_path,
|
|
filebase)) {
|
|
Error(std::string("Unable to generate ") +
|
|
params_.generators[i].lang_name + " for " + filebase);
|
|
}
|
|
} else {
|
|
std::string make_rule = params_.generators[i].make_rule(
|
|
*parser.get(), output_path, filename);
|
|
if (!make_rule.empty())
|
|
printf("%s\n",
|
|
flatbuffers::WordWrap(make_rule, 80, " ", " \\").c_str());
|
|
}
|
|
if (grpc_enabled) {
|
|
if (params_.generators[i].generateGRPC != nullptr) {
|
|
if (!params_.generators[i].generateGRPC(*parser.get(), output_path,
|
|
filebase)) {
|
|
Error(std::string("Unable to generate GRPC interface for") +
|
|
params_.generators[i].lang_name);
|
|
}
|
|
} else {
|
|
Warn(std::string("GRPC interface generator not implemented for ") +
|
|
params_.generators[i].lang_name);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!opts.root_type.empty()) {
|
|
if (!parser->SetRootType(opts.root_type.c_str()))
|
|
Error("unknown root type: " + opts.root_type);
|
|
else if (parser->root_struct_def_->fixed)
|
|
Error("root type must be a table");
|
|
}
|
|
|
|
if (opts.proto_mode) GenerateFBS(*parser.get(), output_path, filebase);
|
|
|
|
// We do not want to generate code for the definitions in this file
|
|
// in any files coming up next.
|
|
parser->MarkGenerated();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
} // namespace flatbuffers
|