| //===- Lexer.h - MLIR Lexer Interface ---------------------------*- C++ -*-===// |
| // |
| // Copyright 2019 The MLIR 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 |
| // |
| // http://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. |
| // ============================================================================= |
| // |
| // This file declares the MLIR Lexer class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef MLIR_LIB_PARSER_LEXER_H |
| #define MLIR_LIB_PARSER_LEXER_H |
| |
| #include "Token.h" |
| |
| namespace llvm { |
| class SourceMgr; |
| } |
| |
| namespace mlir { |
| |
| /// This class breaks up the current file into a token stream. |
| class Lexer { |
| llvm::SourceMgr &sourceMgr; |
| |
| StringRef curBuffer; |
| const char *curPtr; |
| |
| Lexer(const Lexer&) = delete; |
| void operator=(const Lexer&) = delete; |
| public: |
| explicit Lexer(llvm::SourceMgr &sourceMgr); |
| |
| llvm::SourceMgr &getSourceMgr() { return sourceMgr; } |
| |
| Token lexToken(); |
| |
| private: |
| // Helpers. |
| Token formToken(Token::TokenKind kind, const char *tokStart) { |
| return Token(kind, StringRef(tokStart, curPtr-tokStart)); |
| } |
| |
| Token emitError(const char *loc, const Twine &message); |
| |
| // Lexer implementation methods. |
| Token lexComment(); |
| Token lexBareIdentifierOrKeyword(const char *tokStart); |
| Token lexAtIdentifier(const char *tokStart); |
| }; |
| |
| } // end namespace mlir |
| |
| #endif // MLIR_LIB_PARSER_LEXER_H |