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//===- 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_ASMPARSER_LEXER_H
#define MLIR_LIB_ASMPARSER_LEXER_H
#include "Token.h"
#include "mlir/AsmParser/AsmParser.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,
AsmParserCodeCompleteContext *codeCompleteContext);
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(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(); }
/// Returns the end of the buffer.
const char *getBufferEnd() { return curBuffer.end(); }
/// Return the code completion location of the lexer, or nullptr if there is
/// none.
const char *getCodeCompleteLoc() const { return codeCompleteLoc; }
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;
/// An optional code completion point within the input file, used to indicate
/// the position of a code completion token.
const char *codeCompleteLoc;
Lexer(const Lexer &) = delete;
void operator=(const Lexer &) = delete;
};
} // namespace mlir
#endif // MLIR_LIB_ASMPARSER_LEXER_H
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