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// Copyright 2022 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
import * as fs from 'fs';
import { FileDescriptorSet } from 'google-protobuf/google/protobuf/descriptor_pb';
function buildModulePath(rootDir: string, fileName: string): string {
const name = `${rootDir}/${fileName}`;
return name.replace(/\.proto$/, '_pb');
}
export default function generateTemplate(
outputPath: string,
descriptorDataPath: string,
templatePath: string,
protoRootDir: string,
) {
let template = fs.readFileSync(templatePath).toString();
const descriptorSetBinary = fs.readFileSync(descriptorDataPath);
const base64DescriptorSet = descriptorSetBinary.toString('base64');
const fileDescriptorSet = FileDescriptorSet.deserializeBinary(
Buffer.from(descriptorSetBinary),
);
const imports = [];
const moduleDictionary = [];
const fileList = fileDescriptorSet.getFileList();
for (let i = 0; i < fileList.length; i++) {
const file = fileList[i];
const modulePath = buildModulePath('.', file.getName()!);
const moduleName = 'proto_' + i;
imports.push(`import * as ${moduleName} from '${modulePath}';`);
const key = file.getName()!;
moduleDictionary.push(`'${key}': ${moduleName},`);
}
template = template.replace(
'{TEMPLATE_descriptor_binary}',
base64DescriptorSet,
);
template = template.replace('// TEMPLATE_proto_imports', imports.join('\n'));
template = template.replace(
'// TEMPLATE_module_map',
moduleDictionary.join('\n'),
);
fs.writeFileSync(outputPath, template);
}
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