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//===- 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"
#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 lexComment();
Token lexEllipsis(const char *tokStart);
Token lexNumber(const char *tokStart);
Token lexPrefixedIdentifier(const char *tokStart);
Token lexString(const char *tokStart);
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
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