Move most of the code to MathOptFormat.

Author: dourouc05

Project.toml

@@ -5,9 +5,6 @@ version = "0.20.0"
 
 [deps]
 Calculus = "49dc2e85-a5d0-5ad3-a950-438e2897f1b9"
-CodecBzip2 = "523fee87-0ab8-5b00-afb7-3ecf72e48cfd"
-CodecXz = "ba30903b-d9e8-5048-a5ec-d1f5b0d4b47b"
-CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

src/JuMP.jl

@@ -17,9 +17,6 @@ import MathOptInterface
 const MOI = MathOptInterface
 const MOIU = MOI.Utilities
 using MathOptFormat
-import CodecBzip2
-import CodecXz
-import CodecZlib
 
 import Calculus
 import DataStructures.OrderedDict

src/file_formats.jl

@@ -1,72 +1,6 @@
-"""
-List of accepted export formats. `AUTOMATIC_FILE_FORMAT` corresponds to
-a detection from the file name.
-"""
-@enum(FileFormat, CBF, LP, MOF, MPS, AUTOMATIC_FILE_FORMAT)
-
-function _filename_to_format(filename::String)
-    return if endswith(filename, ".mof.json.gz") || endswith(filename, ".mof.json")
-        MOF
-    elseif endswith(filename, ".cbf.gz") || endswith(filename, ".cbf")
-        CBF
-    elseif endswith(filename, ".mps.gz") || endswith(filename, ".mps")
-        MPS
-    elseif endswith(filename, ".lp.gz") || endswith(filename, ".lp")
-        LP
-    else
-        error("File type of $(filename) not recognized by JuMP.")
-    end
-end
-
-"""
-List of accepted export compression formats. `AUTOMATIC_FILE_COMPRESSION`
-corresponds to a detection from the file name.
-"""
-@enum(FileCompression, NO_FILE_COMPRESSION, BZIP2, GZIP, XZ, AUTOMATIC_FILE_COMPRESSION)
-
-function _filename_to_compression(filename::String)
-    return if endswith(filename, ".bz2")
-        BZIP2
-    elseif endswith(filename, ".gz")
-        GZIP
-    elseif endswith(filename, ".xz")
-        XZ
-    else
-        NO_FILE_COMPRESSION
-    end
-end
-
-function _open(f::Function, filename::String, mode::String; compression::FileCompression=AUTOMATIC_FILE_COMPRESSION)
-    if compression == AUTOMATIC_FILE_COMPRESSION
-        compression = _filename_to_compression(filename)
-    end
-
-    if compression == BZIP2 || compression == GZIP || compression == XZ
-        stream = if compression == BZIP2
-            (mode == "r") ? CodecBzip2.Bzip2DecompressorStream : CodecBzip2.Bzip2CompressorStream
-        elseif compression == GZIP
-            (mode == "r") ? CodecZlib.GzipDecompressorStream : CodecZlib.GzipCompressorStream
-        else # compression == XZ
-            (mode == "r") ? CodecXz.XzDecompressorStream : CodecXz.XzCompressorStream
-        end
-        return open(f, stream, filename, mode)
-    else
-        return open(f, filename, mode)
-    end
-end
-
-function write_to_file(model::Model, io::IO, format::FileFormat; kwargs...)
-    dest = if format == CBF
-        MathOptFormat.CBF.Model(; kwargs...)
-    elseif format == LP
-        MathOptFormat.LP.Model(; kwargs...)
-    elseif format == MOF
-        MathOptFormat.MOF.Model(; kwargs...)
-    elseif format == MPS
-        MathOptFormat.MPS.Model(; kwargs...)
-    else
-        error("When passing an IO object to write_to_file, the file format cannot be guessed from the file name.")
-    end
+function write_to_file(model::Model, io::IO, format::MathOptFormat.FileFormat; kwargs...)
+    @assert format != AUTOMATIC_FILE_FORMAT
+    dest = MathOptFormat._file_formats[format]()
     MOI.copy_to(dest, backend(model))
     MOI.write_to_file(dest, io)
     return
@@ -82,12 +16,15 @@ are given by the enum [`FileCompression`](@ref).
 
 For keyword options, see [MathOptFormat.jl](https://github.com/odow/MathOptFormat.jl).
 """
-function write_to_file(model::Model, filename::String; format::FileFormat=AUTOMATIC_FILE_FORMAT, compression::FileCompression=AUTOMATIC_FILE_COMPRESSION, kwargs...)
+function write_to_file(model::Model, filename::String;
+                       format::MathOptFormat.FileFormat=MathOptFormat.AUTOMATIC_FILE_FORMAT,
+                       compression::MathOptFormat.FileCompression=AUTOMATIC_FILE_COMPRESSION,
+                       kwargs...)
     if format == AUTOMATIC_FILE_FORMAT
         format = _filename_to_format(filename)
     end
 
-    _open(filename, "w", compression=compression) do io
+    MathOptFormat.gzip_open(filename, "w", compression=compression) do io
         write_to_file(model, io, format; kwargs...)
     end
     return