131 lines
4.4 KiB
C++
131 lines
4.4 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2023 Google LLC. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google LLC. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef GOOGLE_PROTOBUF_COMPILER_RUST_CONTEXT_H__
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#define GOOGLE_PROTOBUF_COMPILER_RUST_CONTEXT_H__
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#include "absl/log/absl_log.h"
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#include "absl/status/statusor.h"
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#include "absl/strings/string_view.h"
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#include "absl/types/span.h"
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#include "google/protobuf/io/printer.h"
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namespace google {
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namespace protobuf {
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namespace compiler {
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namespace rust {
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// Marks which kernel the Rust codegen should generate code for.
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enum class Kernel {
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kUpb,
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kCpp,
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};
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inline absl::string_view KernelRsName(Kernel kernel) {
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switch (kernel) {
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case Kernel::kUpb:
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return "upb";
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case Kernel::kCpp:
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return "cpp";
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default:
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ABSL_LOG(FATAL) << "Unknown kernel type: " << static_cast<int>(kernel);
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return "";
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}
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}
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// Global options for a codegen invocation.
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struct Options {
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Kernel kernel;
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static absl::StatusOr<Options> Parse(absl::string_view param);
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};
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// A context for generating a particular kind of definition.
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// This type acts as an options struct (as in go/totw/173) for most of the
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// generator.
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//
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// `Descriptor` is the type of a descriptor.h class relevant for the current
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// context.
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template <typename Descriptor>
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class Context {
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public:
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Context(const Options* opts, const Descriptor* desc, io::Printer* printer)
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: opts_(opts), desc_(desc), printer_(printer) {}
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Context(const Context&) = default;
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Context& operator=(const Context&) = default;
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const Descriptor& desc() const { return *desc_; }
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const Options& opts() const { return *opts_; }
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bool is_cpp() const { return opts_->kernel == Kernel::kCpp; }
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bool is_upb() const { return opts_->kernel == Kernel::kUpb; }
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// NOTE: prefer ctx.Emit() over ctx.printer().Emit();
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io::Printer& printer() const { return *printer_; }
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// Creates a new context over a different descriptor.
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template <typename D>
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Context<D> WithDesc(const D& desc) const {
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return Context<D>(opts_, &desc, printer_);
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}
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template <typename D>
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Context<D> WithDesc(const D* desc) const {
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return Context<D>(opts_, desc, printer_);
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}
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Context WithPrinter(io::Printer* printer) const {
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return Context(opts_, desc_, printer);
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}
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// Forwards to Emit(), which will likely be called all the time.
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void Emit(absl::string_view format,
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io::Printer::SourceLocation loc =
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io::Printer::SourceLocation::current()) const {
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printer_->Emit(format, loc);
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}
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void Emit(absl::Span<const io::Printer::Sub> vars, absl::string_view format,
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io::Printer::SourceLocation loc =
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io::Printer::SourceLocation::current()) const {
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printer_->Emit(vars, format, loc);
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}
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private:
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const Options* opts_;
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const Descriptor* desc_;
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io::Printer* printer_;
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};
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} // namespace rust
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} // namespace compiler
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_COMPILER_RUST_CONTEXT_H__
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