Merge pull request #2062 from SciML/myb/param_idx

Add misc metadata for variables/parameters

Author: YingboMa

src/variables.jl

@@ -5,13 +5,15 @@ struct VariableInput end
 struct VariableOutput end
 struct VariableIrreducible end
 struct VariableStatePriority end
+struct VariableMisc end
 Symbolics.option_to_metadata_type(::Val{:unit}) = VariableUnit
 Symbolics.option_to_metadata_type(::Val{:connect}) = VariableConnectType
 Symbolics.option_to_metadata_type(::Val{:noise}) = VariableNoiseType
 Symbolics.option_to_metadata_type(::Val{:input}) = VariableInput
 Symbolics.option_to_metadata_type(::Val{:output}) = VariableOutput
 Symbolics.option_to_metadata_type(::Val{:irreducible}) = VariableIrreducible
 Symbolics.option_to_metadata_type(::Val{:state_priority}) = VariableStatePriority
+Symbolics.option_to_metadata_type(::Val{:misc}) = VariableMisc
 
 abstract type AbstractConnectType end
 struct Equality <: AbstractConnectType end # Equality connection

test/direct.jl

@@ -264,3 +264,10 @@ end
 @test isequal(x, (i = 12, name = :x))
 @test isequal(y, [(i = 13, name = Symbol(:y_, i)) for i in 1:3])
 @test isequal(xys, [x; y])
+
+@variables x [misc = "wow"]
+@test SymbolicUtils.getmetadata(Symbolics.unwrap(x), ModelingToolkit.VariableMisc,
+                                nothing) == "wow"
+@parameters x [misc = "wow"]
+@test SymbolicUtils.getmetadata(Symbolics.unwrap(x), ModelingToolkit.VariableMisc,
+                                nothing) == "wow"