77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
// Copyright 2010-2024 Google LLC
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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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// A reader for files in the MPS format.
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// see http://lpsolve.sourceforge.net/5.5/mps-format.htm
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// and http://www.ici.ro/camo/language/ml11.htm.
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//
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// MPS stands for Mathematical Programming System.
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//
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// The format was invented by IBM in the 60's, and has become the de facto
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// standard. We developed this reader to be able to read benchmark data files.
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// Using the MPS file format for new models is discouraged.
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#ifndef OR_TOOLS_LP_DATA_MPS_READER_H_
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#define OR_TOOLS_LP_DATA_MPS_READER_H_
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#include <string>
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#include "absl/base/attributes.h"
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#include "absl/status/status.h"
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#include "absl/status/statusor.h"
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#include "absl/strings/string_view.h"
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#include "ortools/linear_solver/linear_solver.pb.h"
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#include "ortools/lp_data/lp_data.h"
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namespace operations_research {
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namespace glop {
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// Parses an MPS model from a string.
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absl::StatusOr<MPModelProto> MpsDataToMPModelProto(absl::string_view mps_data);
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// Parses an MPS model from a file.
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absl::StatusOr<MPModelProto> MpsFileToMPModelProto(absl::string_view mps_file);
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// Implementation class. Please use the 2 functions above.
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//
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// Reads a linear program in the mps format.
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//
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// All Parse() methods clear the previously parsed instance and store the result
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// in the given Data class.
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//
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// TODO(user): Remove the MPSReader class.
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class ABSL_DEPRECATED("Use the direct methods instead") MPSReader {
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public:
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enum Form { AUTO_DETECT, FREE, FIXED };
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// Parses instance from a file.
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absl::Status ParseFile(absl::string_view file_name, LinearProgram* data,
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Form form = AUTO_DETECT);
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absl::Status ParseFile(absl::string_view file_name, MPModelProto* data,
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Form form = AUTO_DETECT);
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// Loads instance from string. Useful with MapReduce. Automatically detects
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// the file's format (free or fixed).
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absl::Status ParseProblemFromString(absl::string_view source,
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LinearProgram* data,
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MPSReader::Form form = AUTO_DETECT);
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absl::Status ParseProblemFromString(absl::string_view source,
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MPModelProto* data,
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MPSReader::Form form = AUTO_DETECT);
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};
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} // namespace glop
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} // namespace operations_research
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#endif // OR_TOOLS_LP_DATA_MPS_READER_H_
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