Remove unnecessary helper function

src/Ansatz/Chain.jl

@@ -41,8 +41,8 @@ function Chain(::State, boundary::Periodic, arrays::Vector{<:AbstractArray}; ord
     n = length(arrays)
     symbols = [nextindex() for _ in 1:2n]
 
-    function get_index(directions, i)
-        map(directions) do dir
+    _tensors = map(enumerate(arrays)) do (i, array)
+        inds = map(order) do dir
             if dir == :o
                 symbols[i]
             elseif dir == :r
@@ -53,10 +53,6 @@ function Chain(::State, boundary::Periodic, arrays::Vector{<:AbstractArray}; ord
                 throw(ArgumentError("Invalid direction: $dir"))
             end
         end
-    end
-
-    _tensors = map(enumerate(arrays)) do (i, array)
-        inds = get_index(order, i)
         Tensor(array, inds)
     end
 
@@ -69,20 +65,22 @@ function Chain(::State, boundary::Open, arrays::Vector{<:AbstractArray}; order =
     @assert ndims(arrays[1]) == 2 "First array must have 2 dimensions"
     @assert all(==(3) ∘ ndims, arrays[2:end-1]) "All arrays must have 3 dimensions"
     @assert ndims(arrays[end]) == 2 "Last array must have 2 dimensions"
-    issetequal(order, defaultorder(State())) ||
-        throw(ArgumentError("order must be a permutation of $(String.(defaultorder(State())))"))
+    issetequal(order, defaultorder(Chain, State())) ||
+        throw(ArgumentError("order must be a permutation of $(String.(defaultorder(Chain, State())))"))
 
     n = length(arrays)
     symbols = [nextindex() for _ in 1:2n]
 
-    function get_index(directions, i, is_first, is_last)
-        if is_first
-            directions = filter(x -> x != :l, directions)
-        elseif is_last
-            directions = filter(x -> x != :r, directions)
+    _tensors = map(enumerate(arrays)) do (i, array)
+        if i == 1
+            _order = filter(x -> x != :l, order)
+        elseif i == n
+            _order = filter(x -> x != :r, order)
+        else
+            _order = order
         end
 
-        map(directions) do dir
+        inds = map(_order) do dir
             if dir == :o
                 symbols[i]
             elseif dir == :r
@@ -93,12 +91,6 @@ function Chain(::State, boundary::Open, arrays::Vector{<:AbstractArray}; order =
                 throw(ArgumentError("Invalid direction: $dir"))
             end
         end
-    end
-
-    _tensors = map(enumerate(arrays)) do (i, array)
-        is_first = (i == 1)
-        is_last = (i == n)
-        inds = get_index(order, i, is_first, is_last)
         Tensor(array, inds)
     end
 
@@ -109,14 +101,14 @@ end
 
 function Chain(::Operator, boundary::Periodic, arrays::Vector{<:AbstractArray}; order = defaultorder(Chain, Operator()))
     @assert all(==(4) ∘ ndims, arrays) "All arrays must have 4 dimensions"
-    issetequal(order, defaultorder(Operator())) ||
-        throw(ArgumentError("order must be a permutation of $(String.(defaultorder(Operator())))"))
+    issetequal(order, defaultorder(Chain, Operator())) ||
+        throw(ArgumentError("order must be a permutation of $(String.(defaultorder(Chain, Operator())))"))
 
     n = length(arrays)
     symbols = [nextindex() for _ in 1:3n]
 
-    function get_index(directions, i)
-        map(directions) do dir
+    _tensors = map(enumerate(arrays)) do (i, array)
+        inds = map(order) do dir
             if dir == :o
                 symbols[i]
             elseif dir == :i
@@ -129,10 +121,6 @@ function Chain(::Operator, boundary::Periodic, arrays::Vector{<:AbstractArray};
                 throw(ArgumentError("Invalid direction: $dir"))
             end
         end
-    end
-
-    _tensors = map(enumerate(arrays)) do (i, array)
-        inds = get_index(order, i)
         Tensor(array, inds)
     end
 
@@ -146,20 +134,22 @@ function Chain(::Operator, boundary::Open, arrays::Vector{<:AbstractArray}; orde
     @assert ndims(arrays[1]) == 3 "First array must have 3 dimensions"
     @assert all(==(4) ∘ ndims, arrays[2:end-1]) "All arrays must have 4 dimensions"
     @assert ndims(arrays[end]) == 3 "Last array must have 3 dimensions"
-    issetequal(order, defaultorder(Operator())) ||
-        throw(ArgumentError("order must be a permutation of $(String.(defaultorder(Operator())))"))
+    issetequal(order, defaultorder(Chain, Operator())) ||
+        throw(ArgumentError("order must be a permutation of $(String.(defaultorder(Chain, Operator())))"))
 
     n = length(arrays)
     symbols = [nextindex() for _ in 1:3n-1]
 
-    function get_index(directions, i, is_first, is_last)
-        if is_first
-            directions = filter(x -> x != :l, directions)
-        elseif is_last
-            directions = filter(x -> x != :r, directions)
+    _tensors = map(enumerate(arrays)) do (i, array)
+        if i == 1
+            _order = filter(x -> x != :l, order)
+        elseif i == n
+            _order = filter(x -> x != :r, order)
+        else
+            _order = order
         end
 
-        map(directions) do dir
+        inds = map(_order) do dir
             if dir == :o
                 symbols[i]
             elseif dir == :i
@@ -172,12 +162,6 @@ function Chain(::Operator, boundary::Open, arrays::Vector{<:AbstractArray}; orde
                 throw(ArgumentError("Invalid direction: $dir"))
             end
         end
-    end
-
-    _tensors = map(enumerate(arrays)) do (i, array)
-        is_first = (i == 1)
-        is_last = (i == n)
-        inds = get_index(order, i, is_first, is_last)
         Tensor(array, inds)
     end