Make SymbolicUtils.jl a weak dependency

Author: MilesCranmer

Project.toml

@@ -12,16 +12,20 @@ PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
-SymbolicUtils = "d1185830-fcd6-423d-90d6-eec64667417b"
+Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
+[weakdeps]
+SymbolicUtils = "d1185830-fcd6-423d-90d6-eec64667417b"
+
 [compat]
 Compat = "3.37, 4"
 LoopVectorization = "0.12"
 MacroTools = "0.4, 0.5"
 PrecompileTools = "1"
 Reexport = "1"
+Requires = "1.0, 1.1, 1.2, 1.3"
 SymbolicUtils = "0.19, ^1.0.5"
 Zygote = "0.6"
 julia = "1.6"
@@ -31,7 +35,8 @@ ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
+SymbolicUtils = "d1185830-fcd6-423d-90d6-eec64667417b"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test", "SafeTestsets", "SpecialFunctions", "ForwardDiff", "StaticArrays"]
+test = ["Test", "SafeTestsets", "SpecialFunctions", "ForwardDiff", "StaticArrays", "SymbolicUtils"]

src/DynamicExpressions.jl

@@ -7,10 +7,10 @@ include("EquationUtils.jl")
 include("EvaluateEquation.jl")
 include("EvaluateEquationDerivative.jl")
 include("EvaluationHelpers.jl")
-include("InterfaceSymbolicUtils.jl")
 include("SimplifyEquation.jl")
 include("OperatorEnumConstruction.jl")
 
+using Requires
 using Reexport
 @reexport import .EquationModule:
     Node, string_tree, print_tree, copy_node, set_node!, tree_mapreduce, filter_map
@@ -30,10 +30,16 @@ using Reexport
 @reexport import .EvaluateEquationModule: eval_tree_array, differentiable_eval_tree_array
 @reexport import .EvaluateEquationDerivativeModule:
     eval_diff_tree_array, eval_grad_tree_array
-@reexport import .InterfaceSymbolicUtilsModule: node_to_symbolic, symbolic_to_node
 @reexport import .SimplifyEquationModule: combine_operators, simplify_tree
 @reexport import .EvaluationHelpersModule
 
+function __init__()
+    @require SymbolicUtils = "d1185830-fcd6-423d-90d6-eec64667417b" @eval begin
+        include("InterfaceSymbolicUtils.jl")
+        @reexport import .InterfaceSymbolicUtilsModule: node_to_symbolic, symbolic_to_node
+    end
+end
+
 include("deprecated.jl")
 
 import TOML: parsefile