// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#ifndef CARBON_TOOLCHAIN_LEX_LEX_H_
#define CARBON_TOOLCHAIN_LEX_LEX_H_

#include "toolchain/base/shared_value_stores.h"
#include "toolchain/diagnostics/emitter.h"
#include "toolchain/lex/tokenized_buffer.h"
#include "toolchain/source/source_buffer.h"

namespace Carbon::Lex {

struct LexOptions {
  // Options must be set individually, not through initialization.
  explicit LexOptions() = default;

  // If set, a consumer for diagnostics. Otherwise, diagnostics go to stderr.
  Diagnostics::Consumer* consumer = nullptr;

  // If set, enables verbose output.
  llvm::raw_ostream* vlog_stream = nullptr;

  // If set, tokens will be dumped to this.
  llvm::raw_ostream* dump_stream = nullptr;

  // When dumping, whether to omit `FileStart` and `FileEnd` in output.
  bool omit_file_boundary_tokens = false;
};

// Lexes a buffer of source code into a tokenized buffer.
//
// The provided source buffer must outlive any returned `TokenizedBuffer`
// which will refer into the source.
auto Lex(SharedValueStores& value_stores,
         SourceBuffer& source [[clang::lifetimebound]], LexOptions options)
    -> TokenizedBuffer;

}  // namespace Carbon::Lex

#endif  // CARBON_TOOLCHAIN_LEX_LEX_H_