added available_accessors

Author: Uwe Hernandez Acosta

src/utility.jl

@@ -0,0 +1,38 @@
+"""
+    available_accessors()
+
+Returns a list of available accessor functions for four-momentum components.
+
+This function gathers all defined accessor methods (such as px, py, pz, E, etc.) that are available
+for **any** custom four-momentum type implementing the LorentzVectorBase interface.
+
+### Example
+
+```julia
+julia> LorentzVectorBase.available_accessors()
+38-element Vector{Symbol}:
+ :x
+ :y
+ :z
+ :t
+ :energy
+ :px
+ :py
+ ...
+```
+
+This allows users to query which accessor functions are available for any custom four-momentum type.
+"""
+function available_accessors()
+  res = Symbol[]
+  for acc in FOURMOMENTUM_GETTER_FUNCTIONS
+    push!(res, acc)
+    for (key, val) in FOURMOMENTUM_GETTER_ALIASSES
+      if val == acc
+        push!(res, key)
+        continue
+      end
+    end
+  end
+  return res
+end

test/runtests.jl

@@ -7,6 +7,10 @@ begin
     include("interface.jl")
   end
 
+  @time @safetestset "utility" begin
+    include("utility.jl")
+  end
+
   @time @safetestset "XYZT" begin
     include("XYZT.jl")
   end

test/utility.jl

@@ -0,0 +1,16 @@
+using LorentzVectorBase
+
+av_accessors = available_accessors()
+
+groundtruth = (
+  LorentzVectorBase.FOURMOMENTUM_GETTER_FUNCTIONS...,
+  keys(LorentzVectorBase.FOURMOMENTUM_GETTER_ALIASSES)...,
+)
+
+@testset "available accessors" begin
+  @test length(av_accessors) == length(groundtruth)
+
+  @testset "acc: $acc" for acc in groundtruth
+    @test any(x -> acc == x, av_accessors)
+  end
+end