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//===--- CLI.cpp - ----------------------------------------------*- C++-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang-pseudo/cli/CLI.h"
#include "clang-pseudo/cxx/CXX.h"
#include "clang-pseudo/grammar/Grammar.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
static llvm::cl::opt<std::string> Grammar(
"grammar",
llvm::cl::desc(
"Specify a BNF grammar file path, or a builtin language (cxx)."),
llvm::cl::init("cxx"));
namespace clang {
namespace pseudo {
const Language &getLanguageFromFlags() {
if (::Grammar == "cxx")
return cxx::getLanguage();
static Language *Lang = []() {
// Read from a bnf grammar file.
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> GrammarText =
llvm::MemoryBuffer::getFile(::Grammar);
if (std::error_code EC = GrammarText.getError()) {
llvm::errs() << "Error: can't read grammar file '" << ::Grammar
<< "': " << EC.message() << "\n";
std::exit(1);
}
std::vector<std::string> Diags;
auto G = Grammar::parseBNF(GrammarText->get()->getBuffer(), Diags);
for (const auto &Diag : Diags)
llvm::errs() << Diag << "\n";
auto Table = LRTable::buildSLR(G);
return new Language{
std::move(G),
std::move(Table),
llvm::DenseMap<ExtensionID, RuleGuard>(),
llvm::DenseMap<ExtensionID, RecoveryStrategy>(),
};
}();
return *Lang;
}
} // namespace pseudo
} // namespace clang
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