save/load not working?

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
julia
Domain
data

Research direction

The stack trace points to src/persistence/lg.jl, especially _parse_header at line 62; start by reproducing the savegraph/loadgraph example with the listed Julia, Graphs, and MetaGraphs versions. Compare the generated .lg file with what loadlg expects, and consider the issue resolved when the example loads successfully without the BoundsError.

Written by the indexing model from the issue text.

Description

I thought this should work, but it doesn't:

using Graphs
using MetaGraphs

g = path_graph(5)
mg = MetaGraph(g, 3.0)
set_prop!(mg, :description, "This is a metagraph.")

savegraph("/tmp/test_graph.lg", mg)

mg1 = loadgraph("/tmp/test_graph.lg")

ERROR: LoadError: BoundsError: attempt to access 2-element Vector{SubString{String}} at index [3]
Stacktrace:
  [1] getindex
    @ ./array.jl:861 [inlined]
  [2] indexed_iterate
    @ ./tuple.jl:90 [inlined]
  [3] _parse_header(s::SubString{String})
    @ Graphs ~/.julia/packages/Graphs/zrMoC/src/persistence/lg.jl:62
  [4] loadlg(io::IOStream, gname::String)
    @ Graphs ~/.julia/packages/Graphs/zrMoC/src/persistence/lg.jl:104
  [5] loadgraph
    @ ~/.julia/packages/Graphs/zrMoC/src/persistence/lg.jl:147 [inlined]
  [6] #120
    @ ~/.julia/packages/Graphs/zrMoC/src/persistence/common.jl:15 [inlined]
  [7] open(::Graphs.var"#120#121"{String, LGFormat}, ::String, ::Vararg{String}; kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Base ./io.jl:330
  [8] open
    @ ./io.jl:328 [inlined]
  [9] loadgraph
    @ ~/.julia/packages/Graphs/zrMoC/src/persistence/common.jl:14 [inlined]
 [10] loadgraph(fn::String)
    @ Graphs ~/.julia/packages/Graphs/zrMoC/src/persistence/common.jl:18
 [11] top-level scope
    @ untitled-55510ba3fa4677b8db7457446bdad39a:10

Is it something to do with the compressed format - savegraph(.. ... metagraph ... , compress=false) doesn't work either?

Using Graphs v1.7.0, MetaGraphs v0.7.1, Julia 1.7.

Dominant language
Julia
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Forks
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