forked from OSchip/llvm-project
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//===- Lexer.h - MLIR Lexer Interface ---------------------------*- C++ -*-===//
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//
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// Copyright 2019 The MLIR Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// =============================================================================
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//
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// This file declares the MLIR Lexer class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MLIR_LIB_PARSER_LEXER_H
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#define MLIR_LIB_PARSER_LEXER_H
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#include "mlir/Parser.h"
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#include "Token.h"
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namespace mlir {
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class Location;
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/// This class breaks up the current file into a token stream.
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class Lexer {
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public:
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explicit Lexer(const llvm::SourceMgr &sourceMgr, MLIRContext *context);
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const llvm::SourceMgr &getSourceMgr() { return sourceMgr; }
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Token lexToken();
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/// Encode the specified source location information into a Location object
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/// for attachment to the IR or error reporting.
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Location getEncodedSourceLocation(llvm::SMLoc loc);
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/// Change the position of the lexer cursor. The next token we lex will start
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/// at the designated point in the input.
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void resetPointer(const char *newPointer) { curPtr = newPointer; }
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private:
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// Helpers.
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Token formToken(Token::Kind kind, const char *tokStart) {
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return Token(kind, StringRef(tokStart, curPtr-tokStart));
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}
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Token emitError(const char *loc, const Twine &message);
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// Lexer implementation methods.
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Token lexComment();
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Token lexBareIdentifierOrKeyword(const char *tokStart);
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Token lexAtIdentifier(const char *tokStart);
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Token lexPrefixedIdentifier(const char *tokStart);
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Token lexNumber(const char *tokStart);
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Token lexString(const char *tokStart);
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const llvm::SourceMgr &sourceMgr;
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MLIRContext *context;
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StringRef curBuffer;
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const char *curPtr;
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Lexer(const Lexer &) = delete;
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void operator=(const Lexer &) = delete;
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};
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} // end namespace mlir
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#endif // MLIR_LIB_PARSER_LEXER_H
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