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| 1 | +module LazyNamedDimsArrays |
| 2 | + |
| 3 | +using WrappedUnions: @wrapped, unwrap |
| 4 | +using NamedDimsArrays: |
| 5 | + NamedDimsArrays, |
| 6 | + AbstractNamedDimsArray, |
| 7 | + AbstractNamedDimsArrayStyle, |
| 8 | + dename, |
| 9 | + inds |
| 10 | + |
| 11 | +struct Prod{A} |
| 12 | + factors::Vector{A} |
| 13 | +end |
| 14 | + |
| 15 | +@wrapped struct LazyNamedDimsArray{ |
| 16 | + T, A <: AbstractNamedDimsArray{T}, |
| 17 | + } <: AbstractNamedDimsArray{T, Any} |
| 18 | + union::Union{A, Prod{LazyNamedDimsArray{T, A}}} |
| 19 | +end |
| 20 | + |
| 21 | +function NamedDimsArrays.inds(a::LazyNamedDimsArray) |
| 22 | + if unwrap(a) isa AbstractNamedDimsArray |
| 23 | + return inds(unwrap(a)) |
| 24 | + elseif unwrap(a) isa Prod |
| 25 | + return mapreduce(inds, symdiff, unwrap(a).factors) |
| 26 | + else |
| 27 | + return error("Variant not supported.") |
| 28 | + end |
| 29 | +end |
| 30 | +function NamedDimsArrays.dename(a::LazyNamedDimsArray) |
| 31 | + if unwrap(a) isa AbstractNamedDimsArray |
| 32 | + return dename(unwrap(a)) |
| 33 | + elseif unwrap(a) isa Prod |
| 34 | + return dename(materialize(a), inds(a)) |
| 35 | + else |
| 36 | + return error("Variant not supported.") |
| 37 | + end |
| 38 | +end |
| 39 | + |
| 40 | +using Base.Broadcast: materialize |
| 41 | +function Base.Broadcast.materialize(a::LazyNamedDimsArray) |
| 42 | + if unwrap(a) isa AbstractNamedDimsArray |
| 43 | + return unwrap(a) |
| 44 | + elseif unwrap(a) isa Prod |
| 45 | + return prod(materialize, unwrap(a).factors) |
| 46 | + else |
| 47 | + return error("Variant not supported.") |
| 48 | + end |
| 49 | +end |
| 50 | +Base.copy(a::LazyNamedDimsArray) = materialize(a) |
| 51 | + |
| 52 | +function Base.:*(a::LazyNamedDimsArray) |
| 53 | + if unwrap(a) isa AbstractNamedDimsArray |
| 54 | + return LazyNamedDimsArray(Prod([lazy(unwrap(a))])) |
| 55 | + elseif unwrap(a) isa Prod |
| 56 | + return a |
| 57 | + else |
| 58 | + return error("Variant not supported.") |
| 59 | + end |
| 60 | +end |
| 61 | + |
| 62 | +function Base.:*(a1::LazyNamedDimsArray, a2::LazyNamedDimsArray) |
| 63 | + # Nested by default. |
| 64 | + return LazyNamedDimsArray(Prod([a1, a2])) |
| 65 | +end |
| 66 | +function Base.:+(a1::LazyNamedDimsArray, a2::LazyNamedDimsArray) |
| 67 | + return error("Not implemented.") |
| 68 | +end |
| 69 | +function Base.:-(a1::LazyNamedDimsArray, a2::LazyNamedDimsArray) |
| 70 | + return error("Not implemented.") |
| 71 | +end |
| 72 | +function Base.:*(c::Number, a::LazyNamedDimsArray) |
| 73 | + return error("Not implemented.") |
| 74 | +end |
| 75 | +function Base.:*(a::LazyNamedDimsArray, c::Number) |
| 76 | + return error("Not implemented.") |
| 77 | +end |
| 78 | +function Base.:/(a::LazyNamedDimsArray, c::Number) |
| 79 | + return error("Not implemented.") |
| 80 | +end |
| 81 | +function Base.:-(a::LazyNamedDimsArray) |
| 82 | + return error("Not implemented.") |
| 83 | +end |
| 84 | + |
| 85 | +function LazyNamedDimsArray(a::AbstractNamedDimsArray) |
| 86 | + return LazyNamedDimsArray{eltype(a), typeof(a)}(a) |
| 87 | +end |
| 88 | +function LazyNamedDimsArray(a::Prod{LazyNamedDimsArray{T, A}}) where {T, A} |
| 89 | + return LazyNamedDimsArray{T, A}(a) |
| 90 | +end |
| 91 | +function lazy(a::AbstractNamedDimsArray) |
| 92 | + return LazyNamedDimsArray(a) |
| 93 | +end |
| 94 | + |
| 95 | +# Broadcasting |
| 96 | +struct LazyNamedDimsArrayStyle <: AbstractNamedDimsArrayStyle{Any} end |
| 97 | +function Base.BroadcastStyle(::Type{<:LazyNamedDimsArray}) |
| 98 | + return LazyNamedDimsArrayStyle() |
| 99 | +end |
| 100 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, f, as...) |
| 101 | + return error("Arbitrary broadcasting not supported for LazyNamedDimsArray.") |
| 102 | +end |
| 103 | +# Linear operations. |
| 104 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, ::typeof(+), a1, a2) |
| 105 | + return a1 + a2 |
| 106 | +end |
| 107 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, ::typeof(-), a1, a2) |
| 108 | + return a1 - a2 |
| 109 | +end |
| 110 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, ::typeof(*), c::Number, a) |
| 111 | + return c * a |
| 112 | +end |
| 113 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, ::typeof(*), a, c::Number) |
| 114 | + return a * c |
| 115 | +end |
| 116 | +# Fix ambiguity error. |
| 117 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, ::typeof(*), a::Number, b::Number) |
| 118 | + return a * b |
| 119 | +end |
| 120 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, ::typeof(/), a, c::Number) |
| 121 | + return a / c |
| 122 | +end |
| 123 | +function Broadcast.broadcasted(::LazyNamedDimsArrayStyle, ::typeof(-), a) |
| 124 | + return -a |
| 125 | +end |
| 126 | + |
| 127 | +using TermInterface: TermInterface |
| 128 | +# arguments, arity, children, head, iscall, operation |
| 129 | +function TermInterface.arguments(a::LazyNamedDimsArray) |
| 130 | + if unwrap(a) isa AbstractNamedDimsArray |
| 131 | + return error("No arguments.") |
| 132 | + elseif unwrap(a) isa Prod |
| 133 | + unwrap(a).factors |
| 134 | + else |
| 135 | + return error("Variant not supported.") |
| 136 | + end |
| 137 | +end |
| 138 | +function TermInterface.children(a::LazyNamedDimsArray) |
| 139 | + return TermInterface.arguments(a) |
| 140 | +end |
| 141 | +function TermInterface.head(a::LazyNamedDimsArray) |
| 142 | + return TermInterface.operation(a) |
| 143 | +end |
| 144 | +function TermInterface.iscall(a::LazyNamedDimsArray) |
| 145 | + if unwrap(a) isa AbstractNamedDimsArray |
| 146 | + return false |
| 147 | + elseif unwrap(a) isa Prod |
| 148 | + return true |
| 149 | + else |
| 150 | + return false |
| 151 | + end |
| 152 | +end |
| 153 | +function TermInterface.isexpr(a::LazyNamedDimsArray) |
| 154 | + return TermInterface.iscall(a) |
| 155 | +end |
| 156 | +function TermInterface.maketerm(::Type{LazyNamedDimsArray}, head, args, metadata) |
| 157 | + if head ≡ prod |
| 158 | + return LazyNamedDimsArray(Prod(args)) |
| 159 | + else |
| 160 | + return error("Only product terms supported right now.") |
| 161 | + end |
| 162 | +end |
| 163 | +function TermInterface.operation(a::LazyNamedDimsArray) |
| 164 | + if unwrap(a) isa AbstractNamedDimsArray |
| 165 | + return error("No operation.") |
| 166 | + elseif unwrap(a) isa Prod |
| 167 | + prod |
| 168 | + else |
| 169 | + return error("Variant not supported.") |
| 170 | + end |
| 171 | +end |
| 172 | +function TermInterface.sorted_arguments(a::LazyNamedDimsArray) |
| 173 | + if unwrap(a) isa AbstractNamedDimsArray |
| 174 | + return error("No arguments.") |
| 175 | + elseif unwrap(a) isa Prod |
| 176 | + return TermInterface.arguments(a) |
| 177 | + else |
| 178 | + return error("Variant not supported.") |
| 179 | + end |
| 180 | +end |
| 181 | + |
| 182 | +end |
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