Make sparsearrays into a weak dependency

Project.toml

@@ -1,7 +1,7 @@
 name = "RecursiveArrayTools"
 uuid = "731186ca-8d62-57ce-b412-fbd966d074cd"
 authors = ["Chris Rackauckas <accounts@chrisrackauckas.com>"]
-version = "3.26.0"
+version = "3.27.0"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
@@ -11,7 +11,6 @@ GPUArraysCore = "46192b85-c4d5-4398-a991-12ede77f4527"
 IteratorInterfaceExtensions = "82899510-4779-5014-852e-03e436cf321d"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 RecipesBase = "3cdcf5f2-1ef4-517c-9805-6587b60abb01"
-SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 StaticArraysCore = "1e83bf80-4336-4d27-bf5d-d5a4f845583c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 SymbolicIndexingInterface = "2efcf032-c050-4f8e-a9bb-153293bab1f5"
@@ -22,6 +21,7 @@ FastBroadcast = "7034ab61-46d4-4ed7-9d0f-46aef9175898"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 Measurements = "eff96d63-e80a-5855-80a2-b1b0885c5ab7"
 MonteCarloMeasurements = "0987c9cc-fe09-11e8-30f0-b96dd679fdca"
+SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 Tracker = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
@@ -32,6 +32,7 @@ RecursiveArrayToolsForwardDiffExt = "ForwardDiff"
 RecursiveArrayToolsMeasurementsExt = "Measurements"
 RecursiveArrayToolsMonteCarloMeasurementsExt = "MonteCarloMeasurements"
 RecursiveArrayToolsReverseDiffExt = ["ReverseDiff", "Zygote"]
+RecursiveArrayToolsSparseArraysExt = ["SparseArrays"]
 RecursiveArrayToolsTrackerExt = "Tracker"
 RecursiveArrayToolsZygoteExt = "Zygote"
 
@@ -78,6 +79,7 @@ OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
+SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 StructArrays = "09ab397b-f2b6-538f-b94a-2f83cf4a842a"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
@@ -86,4 +88,4 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [targets]
-test = ["SafeTestsets", "Aqua", "FastBroadcast", "ForwardDiff", "NLsolve", "OrdinaryDiffEq", "Pkg", "Test", "Unitful", "Random", "StaticArrays", "StructArrays", "Zygote", "Measurements"]
+test = ["SafeTestsets", "Aqua", "FastBroadcast", "SparseArrays", "ForwardDiff", "NLsolve", "OrdinaryDiffEq", "Pkg", "Test", "Unitful", "Random", "StaticArrays", "StructArrays", "Zygote", "Measurements"]

ext/RecursiveArrayToolsSparseArraysExt.jl

@@ -0,0 +1,20 @@
+module RecursiveArrayToolsSparseArraysExt
+
+import SparseArrays
+import RecursiveArrayTools
+
+function Base.copyto!(dest::SparseArrays.AbstractCompressedVector, A::RecursiveArrayTools.ArrayPartition)
+    @assert length(dest) == length(A)
+    cur = 1
+    @inbounds for i in 1:length(A.x)
+        if A.x[i] isa Number
+            dest[cur:(cur + length(A.x[i]) - 1)] .= A.x[i]
+        else
+            dest[cur:(cur + length(A.x[i]) - 1)] .= vec(A.x[i])
+        end
+        cur += length(A.x[i])
+    end
+    dest
+end
+
+end

src/RecursiveArrayTools.jl

@@ -8,7 +8,6 @@ using DocStringExtensions
 using RecipesBase, StaticArraysCore, Statistics,
       ArrayInterface, LinearAlgebra
 using SymbolicIndexingInterface
-using SparseArrays
 
 import Adapt
 

src/array_partition.jl

@@ -176,7 +176,7 @@ Base.all(f, A::ArrayPartition) = all(f, (all(f, x) for x in A.x))
 Base.all(f::Function, A::ArrayPartition) = all((all(f, x) for x in A.x))
 Base.all(A::ArrayPartition) = all(identity, A)
 
-for type in [AbstractArray, SparseArrays.AbstractCompressedVector, PermutedDimsArray]
+for type in [AbstractArray, PermutedDimsArray]
     @eval function Base.copyto!(dest::$(type), A::ArrayPartition)
         @assert length(dest) == length(A)
         cur = 1