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95 lines
3.4 KiB
95 lines
3.4 KiB
// Copyright 2022 Google LLC
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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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// Code generator that generates the CPP header for the AST definition of a
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// language. The input grammar files should have extension "g4".
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//
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// Usage:
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// $ grammar_domain_code_generator \
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// --input_grammar_files=json.g4,morefile.g4 \
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// --output_header_file=json_grammar.h
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#include <filesystem>
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#include <optional>
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#include <string>
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#include <vector>
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#include "absl/flags/flag.h"
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#include "absl/flags/parse.h"
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#include "./grammar_codegen/code_generation.h"
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#include "./fuzztest/internal/logging.h"
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ABSL_FLAG(std::string, output_header_file_path, "",
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"Required. The path of the generated grammar header file.");
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ABSL_FLAG(
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std::vector<std::string>, input_grammar_files, std::vector<std::string>(),
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"Required. The nonempty list of the input grammar specification files.");
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ABSL_FLAG(
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std::string, top_level_rule, "",
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"Optional. The name of the top level grammar rule. The domain "
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"generates strings of the grammar rule under this name. It is also in used"
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"the domain name.");
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ABSL_FLAG(bool, insert_whitespace, false,
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"Optional. If true, spaces will be inserted between blocks of a "
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"parser production rule. This is sometimes useful if the original "
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"ANTLR grammar skips whitespaces. Generating whitespaces will help "
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"the lexer disambiguate tokens like keywords vs identifiers.");
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namespace {
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std::string GetContents(const std::string& path) {
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std::stringstream ss;
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ss << std::ifstream(path).rdbuf();
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return ss.str();
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}
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} // namespace
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int main(int argc, char** argv) {
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absl::ParseCommandLine(argc, argv);
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std::string output_file_path = absl::GetFlag(FLAGS_output_header_file_path);
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FUZZTEST_INTERNAL_CHECK_PRECONDITION(
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!output_file_path.empty(),
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"You must specify output file with --output_header_file_path");
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std::ofstream output_file(output_file_path);
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FUZZTEST_INTERNAL_CHECK_PRECONDITION(output_file.is_open(),
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"Cannot open output file!");
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std::vector<std::string> input_files =
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absl::GetFlag(FLAGS_input_grammar_files);
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FUZZTEST_INTERNAL_CHECK_PRECONDITION(
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!input_files.empty(),
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"You must provide the list of input files, separated by ','");
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std::optional<std::string> grammar_name = std::nullopt;
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if (!absl::GetFlag(FLAGS_top_level_rule).empty()) {
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grammar_name = absl::GetFlag(FLAGS_top_level_rule);
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}
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std::vector<std::string> input_grammar_specs;
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for (const std::string& input_file : input_files) {
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FUZZTEST_INTERNAL_CHECK_PRECONDITION(std::filesystem::exists(input_file),
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input_file.c_str(), " not exist!");
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input_grammar_specs.push_back(GetContents(input_file));
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}
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output_file << fuzztest::internal::grammar::GenerateGrammarHeader(
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input_grammar_specs, grammar_name,
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absl::GetFlag(FLAGS_insert_whitespace));
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output_file.close();
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return 0;
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}
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