Fix get function (#93)

* Fix `get` function

* fix definition and tests

* use `optic` instead of`.optic`

* add tests for `set`

* fix more test errors

* fix doctest

* version bump

Project.toml

@@ -3,7 +3,7 @@ uuid = "7a57a42e-76ec-4ea3-a279-07e840d6d9cf"
 keywords = ["probablistic programming"]
 license = "MIT"
 desc = "Common interfaces for probabilistic programming"
-version = "0.8.0"
+version = "0.8.1"
 
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"

src/varname.jl

@@ -122,23 +122,11 @@ getoptic(vn::VarName) = vn.optic
 """
     get(obj, vn::VarName{sym})
 
-Alias for `getoptic(vn)(obj)`.
-
-# Example
-
-```jldoctest; setup = :(nt = (a = 1, b = (c = [1, 2, 3],)); name = :nt)
-julia> get(nt, @varname(nt.a))
-1
-
-julia> get(nt, @varname(nt.b.c[1]))
-1
-
-julia> get(nt, @varname(\$name.b.c[1]))
-1
+Alias for `(PropertyLens{sym}() ⨟ getoptic(vn))(obj)`.
 ```
 """
 function Base.get(obj, vn::VarName{sym}) where {sym}
-    return getoptic(vn)(obj)
+    return (PropertyLens{sym}() ⨟ getoptic(vn))(obj)
 end
 
 """

test/varname.jl

@@ -14,6 +14,19 @@ macro test_strict_subsumption(x, y)
     end
 end
 
+function test_equal(o1::VarName{sym1}, o2::VarName{sym2}) where {sym1, sym2}
+    return sym1 === sym2 && test_equal(o1.optic, o2.optic)
+end
+function test_equal(o1::ComposedFunction, o2::ComposedFunction)
+    return test_equal(o1.inner, o2.inner) && test_equal(o1.outer, o2.outer)
+end
+function test_equal(o1::Accessors.IndexLens, o2::Accessors.IndexLens)
+    return test_equal(o1.indices, o2.indices)
+end
+function test_equal(o1, o2)
+    return o1 == o2
+end
+
 @testset "varnames" begin
     @testset "construction & concretization" begin
         i = 1:10
@@ -27,14 +40,22 @@ end
 
         # concretization
         y = zeros(10, 10)
-        x = (a = [1.0 2.0; 3.0 4.0; 5.0 6.0], );
+        x = (a = [1.0 2.0; 3.0 4.0; 5.0 6.0],);
 
         @test @varname(y[begin, i], true) == @varname(y[1, 1:10])
-        @test get(y, @varname(y[:], true)) ==  get(y, @varname(y[1:100]))
-        @test get(y, @varname(y[:, begin], true)) == get(y, @varname(y[1:10, 1]))
-        @test getoptic(AbstractPPL.concretize(@varname(y[:]), y)).indices[1] ===
+        @test test_equal(@varname(y[:], true), @varname(y[1:100]))
+        @test test_equal(@varname(y[:, begin], true), @varname(y[1:10, 1]))
+        @test getoptic(AbstractPPL.concretize(@varname(y[:]), y)).indices[1] === 
             AbstractPPL.ConcretizedSlice(to_indices(y, (:,))[1])
-        @test get(x, @varname(x.a[1:end, end][:], true)) == get(x, @varname(x.a[1:3,2][1:3]))
+        @test test_equal(@varname(x.a[1:end, end][:], true), @varname(x.a[1:3,2][1:3]))
+    end
+
+    @testset "get & set" begin
+        x = (a = [1.0 2.0; 3.0 4.0; 5.0 6.0], b = 1.0);
+        @test get(x, @varname(a[1, 2])) == 2.0
+        @test get(x, @varname(b)) == 1.0
+        @test set(x, @varname(a[1, 2]), 10) == (a = [1.0 10.0; 3.0 4.0; 5.0 6.0], b = 1.0)
+        @test set(x, @varname(b), 10) == (a = [1.0 2.0; 3.0 4.0; 5.0 6.0], b = 10.0)
     end
 
     @testset "subsumption with standard indexing" begin
@@ -83,10 +104,10 @@ end
 
     @testset "non-standard indexing" begin
         A = rand(10, 10)
-        @test get(A, @varname(A[1, Not(3)], true)) == get(A, @varname(A[1, [1, 2, 4, 5, 6, 7, 8, 9, 10]]))
+        @test test_equal(@varname(A[1, Not(3)], true), @varname(A[1, [1, 2, 4, 5, 6, 7, 8, 9, 10]]))
 
         B = OffsetArray(A, -5, -5) # indices -4:5×-4:5
-        @test collect(get(B, @varname(B[1, :], true))) == collect(get(B, @varname(B[1, -4:5])))
+        @test test_equal(@varname(B[1, :], true), @varname(B[1, -4:5]))
 
     end
     @testset "type stability" begin
@@ -96,15 +117,12 @@ end
         @inferred VarName{:a}(PropertyLens(:b))
         @inferred VarName{:a}(Accessors.opcompose(IndexLens(1), PropertyLens(:b)))
 
-        a = [1, 2, 3]
-        @inferred get(a, @varname(a[1]))
-
         b = (a=[1, 2, 3],)
-        @inferred get(b, @varname(b.a[1]))
+        @inferred get(b, @varname(a[1]))
         @inferred Accessors.set(b, @varname(a[1]), 10)
 
         c = (b=(a=[1, 2, 3],),)
-        @inferred get(c, @varname(c.b.a[1]))
+        @inferred get(c, @varname(b.a[1]))
         @inferred Accessors.set(c, @varname(b.a[1]), 10)
     end
 end