| 1 | //===--- CLI.cpp - ----------------------------------------------*- C++-*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "clang-pseudo/cli/CLI.h" |
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| 10 | #include "clang-pseudo/cxx/CXX.h" |
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| 11 | #include "clang-pseudo/grammar/Grammar.h" |
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| 12 | #include "llvm/Support/CommandLine.h" |
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| 13 | #include "llvm/Support/ErrorOr.h" |
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| 14 | #include "llvm/Support/MemoryBuffer.h" |
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| 15 | |
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| 16 | static llvm::cl::opt<std::string> Grammar( |
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| 17 | "grammar" , |
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| 18 | llvm::cl::desc( |
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| 19 | "Specify a BNF grammar file path, or a builtin language (cxx)." ), |
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| 20 | llvm::cl::init(Val: "cxx" )); |
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| 21 | |
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| 22 | namespace clang { |
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| 23 | namespace pseudo { |
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| 24 | |
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| 25 | const Language &getLanguageFromFlags() { |
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| 26 | if (::Grammar == "cxx" ) |
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| 27 | return cxx::getLanguage(); |
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| 28 | |
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| 29 | static Language *Lang = []() { |
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| 30 | // Read from a bnf grammar file. |
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| 31 | llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> GrammarText = |
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| 32 | llvm::MemoryBuffer::getFile(Filename: ::Grammar); |
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| 33 | if (std::error_code EC = GrammarText.getError()) { |
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| 34 | llvm::errs() << "Error: can't read grammar file '" << ::Grammar |
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| 35 | << "': " << EC.message() << "\n" ; |
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| 36 | std::exit(status: 1); |
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| 37 | } |
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| 38 | std::vector<std::string> Diags; |
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| 39 | auto G = Grammar::parseBNF(BNF: GrammarText->get()->getBuffer(), Diags); |
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| 40 | for (const auto &Diag : Diags) |
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| 41 | llvm::errs() << Diag << "\n" ; |
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| 42 | auto Table = LRTable::buildSLR(G); |
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| 43 | return new Language{ |
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| 44 | .G: std::move(G), |
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| 45 | .Table: std::move(Table), |
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| 46 | .Guards: llvm::DenseMap<ExtensionID, RuleGuard>(), |
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| 47 | .RecoveryStrategies: llvm::DenseMap<ExtensionID, RecoveryStrategy>(), |
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| 48 | }; |
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| 49 | }(); |
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| 50 | return *Lang; |
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| 51 | } |
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| 52 | |
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| 53 | } // namespace pseudo |
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| 54 | } // namespace clang |
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| 55 | |
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