feat: add more methods for staticstring

src/staticstring.jl

@@ -59,3 +59,11 @@ function Base.String(x::StaticString{N, T}) where {N, T}
     b = Base.StringVector(N)
     return String(b .= x.codeunits)
 end
+
+@inline Base.ncodeunits(::StaticString{N}) where N = N
+
+function StaticString(cu::Base.CodeUnits{T}) where T
+    N = length(cu)
+    return StaticString{N, T}(NTuple{N, T}(cu))
+end
+StaticString(s::AbstractString) = StaticString(codeunits(s))

test/runtests.jl

@@ -7,6 +7,7 @@ include("epochs_test.jl")
 include("comprehensive_test.jl")
 include("cdf2_test.jl")
 include("CommonDataModelExt_test.jl")
+include("staticstring.jl")
 
 @testset "Aqua" begin
     using Aqua

test/staticstring.jl

@@ -0,0 +1,11 @@
+using CommonDataFormat: StaticString
+
+@testset "StaticString" begin
+    s = "Hello, World!"
+    ss = StaticString(s)
+
+    StaticString(codeunits(s))
+    @test ss == s
+    @test String(ss) == s
+    @test !isempty(ss)
+end