| //===- Lexer.h - MLIR Lexer Interface ---------------------------*- 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file declares the MLIR Lexer class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef MLIR_LIB_PARSER_LEXER_H |
| #define MLIR_LIB_PARSER_LEXER_H |
| |
| #include "Token.h" |
| #include "mlir/Parser.h" |
| |
| namespace mlir { |
| class Location; |
| |
| /// This class breaks up the current file into a token stream. |
| class Lexer { |
| public: |
| explicit Lexer(const llvm::SourceMgr &sourceMgr, MLIRContext *context); |
| |
| const llvm::SourceMgr &getSourceMgr() { return sourceMgr; } |
| |
| Token lexToken(); |
| |
| /// Encode the specified source location information into a Location object |
| /// for attachment to the IR or error reporting. |
| Location getEncodedSourceLocation(llvm::SMLoc loc); |
| |
| /// Change the position of the lexer cursor. The next token we lex will start |
| /// at the designated point in the input. |
| void resetPointer(const char *newPointer) { curPtr = newPointer; } |
| |
| /// Returns the start of the buffer. |
| const char *getBufferBegin() { return curBuffer.data(); } |
| |
| private: |
| // Helpers. |
| Token formToken(Token::Kind kind, const char *tokStart) { |
| return Token(kind, StringRef(tokStart, curPtr - tokStart)); |
| } |
| |
| Token emitError(const char *loc, const Twine &message); |
| |
| // Lexer implementation methods. |
| Token lexAtIdentifier(const char *tokStart); |
| Token lexBareIdentifierOrKeyword(const char *tokStart); |
| Token lexEllipsis(const char *tokStart); |
| Token lexNumber(const char *tokStart); |
| Token lexPrefixedIdentifier(const char *tokStart); |
| Token lexString(const char *tokStart); |
| |
| /// Skip a comment line, starting with a '//'. |
| void skipComment(); |
| |
| const llvm::SourceMgr &sourceMgr; |
| MLIRContext *context; |
| |
| StringRef curBuffer; |
| const char *curPtr; |
| |
| Lexer(const Lexer &) = delete; |
| void operator=(const Lexer &) = delete; |
| }; |
| |
| } // end namespace mlir |
| |
| #endif // MLIR_LIB_PARSER_LEXER_H |