feat: add parameter timeseries support to AbstractDiffEqArray

Author: AayushSabharwal

src/vector_of_array.jl

@@ -60,11 +60,13 @@ A[1, :]  # all time periods for f(t)
 A.t
 ```
 """
-mutable struct DiffEqArray{T, N, A, B, F, S} <: AbstractDiffEqArray{T, N, A}
+mutable struct DiffEqArray{T, N, A, B, F, S, D <: Union{Nothing, ParameterTimeseriesCollection}} <:
+        AbstractDiffEqArray{T, N, A}
     u::A # A <: AbstractVector{<: AbstractArray{T, N - 1}}
     t::B
     p::F
     sys::S
+    discretes::D
 end
 ### Abstract Interface
 struct AllObserved
@@ -174,29 +176,32 @@ function DiffEqArray(vec::AbstractVector{T},
         ts::AbstractVector,
         ::NTuple{N, Int},
         p = nothing,
-        sys = nothing) where {T, N}
-    DiffEqArray{eltype(T), N, typeof(vec), typeof(ts), typeof(p), typeof(sys)}(vec,
+        sys = nothing; discretes = nothing) where {T, N}
+    DiffEqArray{eltype(T), N, typeof(vec), typeof(ts), typeof(p), typeof(sys), typeof(discretes)}(vec,
         ts,
         p,
-        sys)
+        sys,
+        discretes)
 end
 
 # ambiguity resolution
 function DiffEqArray(vec::AbstractVector{VT},
         ts::AbstractVector,
         ::NTuple{N, Int}) where {T, N, VT <: AbstractArray{T, N}}
-    DiffEqArray{eltype(T), N, typeof(vec), typeof(ts), Nothing, Nothing}(vec,
+    DiffEqArray{eltype(T), N, typeof(vec), typeof(ts), Nothing, Nothing, Nothing}(vec,
         ts,
         nothing,
+        nothing,
         nothing)
 end
 function DiffEqArray(vec::AbstractVector{VT},
         ts::AbstractVector,
-        ::NTuple{N, Int}, p) where {T, N, VT <: AbstractArray{T, N}}
-    DiffEqArray{eltype(T), N, typeof(vec), typeof(ts), typeof(p), Nothing}(vec,
+        ::NTuple{N, Int}, p; discretes = nothing) where {T, N, VT <: AbstractArray{T, N}}
+    DiffEqArray{eltype(T), N, typeof(vec), typeof(ts), typeof(p), Nothing, typeof(discretes)}(vec,
         ts,
         p,
-        nothing)
+        nothing,
+        discretes)
 end
 # Assume that the first element is representative of all other elements
 
@@ -206,7 +211,8 @@ function DiffEqArray(vec::AbstractVector,
         sys = nothing;
         variables = nothing,
         parameters = nothing,
-        independent_variables = nothing)
+        independent_variables = nothing,
+        discretes = nothing)
     sys = something(sys,
         SymbolCache(something(variables, []),
             something(parameters, []),
@@ -219,11 +225,13 @@ function DiffEqArray(vec::AbstractVector,
         typeof(vec),
         typeof(ts),
         typeof(p),
-        typeof(sys)
+        typeof(sys),
+        typeof(discretes)
     }(vec,
         ts,
         p,
-        sys)
+        sys,
+        discretes)
 end
 
 function DiffEqArray(vec::AbstractVector{VT},
@@ -232,7 +240,8 @@ function DiffEqArray(vec::AbstractVector{VT},
         sys = nothing;
         variables = nothing,
         parameters = nothing,
-        independent_variables = nothing) where {T, N, VT <: AbstractArray{T, N}}
+        independent_variables = nothing,
+        discretes = nothing) where {T, N, VT <: AbstractArray{T, N}}
     sys = something(sys,
         SymbolCache(something(variables, []),
             something(parameters, []),
@@ -243,18 +252,30 @@ function DiffEqArray(vec::AbstractVector{VT},
         typeof(vec),
         typeof(ts),
         typeof(p),
-        typeof(sys)
+        typeof(sys),
+        typeof(discretes),
     }(vec,
         ts,
         p,
-        sys)
+        sys,
+        discretes)
 end
 
+has_discretes(::T) where {T <: AbstractDiffEqArray} = hasfield(T, :discretes)
+get_discretes(x) = getfield(x, :discretes)
+
 SymbolicIndexingInterface.is_timeseries(::Type{<:AbstractVectorOfArray}) = Timeseries()
+function SymbolicIndexingInterface.is_parameter_timeseries(::Type{DiffEqArray{T, N, A, B,
+        F, S, D}}) where {T, N, A, B, F, S, D <: ParameterIndexingProxy}
+    Timeseries()
+end
 SymbolicIndexingInterface.state_values(A::AbstractDiffEqArray) = A.u
 SymbolicIndexingInterface.current_time(A::AbstractDiffEqArray) = A.t
 SymbolicIndexingInterface.parameter_values(A::AbstractDiffEqArray) = A.p
 SymbolicIndexingInterface.symbolic_container(A::AbstractDiffEqArray) = A.sys
+function SymbolicIndexingInterface.get_parameter_timeseries_collection(A::AbstractDiffEqArray)
+    return get_discretes(A)
+end
 
 Base.IndexStyle(A::AbstractVectorOfArray) = Base.IndexStyle(typeof(A))
 Base.IndexStyle(::Type{<:AbstractVectorOfArray}) = IndexCartesian()
@@ -363,39 +384,18 @@ end
 
 # Symbolic Indexing Methods
 for (symtype, elsymtype, valtype, errcheck) in [
-    (ScalarSymbolic, SymbolicIndexingInterface.SymbolicTypeTrait, Any, :(is_parameter(A, sym))),
-    (ArraySymbolic, SymbolicIndexingInterface.SymbolicTypeTrait, Any, :(is_parameter(A, sym))),
+    (ScalarSymbolic, SymbolicIndexingInterface.SymbolicTypeTrait, Any, :(is_parameter(A, sym) && !is_timeseries_parameter(A, sym))),
+    (ArraySymbolic, SymbolicIndexingInterface.SymbolicTypeTrait, Any, :(is_parameter(A, sym) && !is_timeseries_parameter(A, sym))),
     (NotSymbolic, SymbolicIndexingInterface.SymbolicTypeTrait, Union{<:Tuple, <:AbstractArray}, 
-        :(all(x -> is_parameter(A, x), sym))),
+        :(all(x -> is_parameter(A, x) && !is_timeseries_parameter(A, x), sym))),
 ]
-@eval Base.@propagate_inbounds function _getindex(A::AbstractDiffEqArray, ::$symtype,
-        ::$elsymtype, sym::$valtype)
-    if $errcheck
-        throw(ParameterIndexingError(sym))
-    end
-    getu(A, sym)(A)
-end
-@eval Base.@propagate_inbounds function _getindex(A::AbstractDiffEqArray, ::$symtype,
-        ::$elsymtype, sym::$valtype, arg)
-    if $errcheck
-        throw(ParameterIndexingError(sym))
-    end
-    getu(A, sym)(A, arg)
-end
-@eval Base.@propagate_inbounds function _getindex(A::AbstractDiffEqArray, ::$symtype,
-        ::$elsymtype, sym::$valtype, arg::Union{AbstractArray{Int}, AbstractArray{Bool}})
-    if $errcheck
-        throw(ParameterIndexingError(sym))
-    end
-    getu(A, sym).((A,), arg)
-end
-@eval Base.@propagate_inbounds function _getindex(A::AbstractDiffEqArray, ::$symtype,
-        ::$elsymtype, sym::$valtype, ::Colon)
-    if $errcheck
-        throw(ParameterIndexingError(sym))
+    @eval Base.@propagate_inbounds function _getindex(A::AbstractDiffEqArray, ::$symtype,
+            ::$elsymtype, sym::$valtype, arg...)
+        if $errcheck
+            throw(ParameterIndexingError(sym))
+        end
+        getu(A, sym)(A, arg...)
     end
-    getu(A, sym)(A)
-end
 end
 
 Base.@propagate_inbounds function _getindex(A::AbstractDiffEqArray, ::ScalarSymbolic,