feat: add more methods for staticstring

Author: Beforerr

src/staticstring.jl

@@ -29,7 +29,7 @@ function Base.iterate(x::StaticString{N, UInt8}, i::Int = 1) where {N}
                 reinterpret(
                     Char,
                     (UInt32(cs[i]) << 24) |
-                        (UInt32(cs[i + 1]) << 16) |
+                    (UInt32(cs[i + 1]) << 16) |
                         (UInt32(cs[i + 2]) << 8),
                 ),
                 i + 3,
@@ -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(s::AbstractString)
+    T = codeunit(s)
+    N = ncodeunits(s)
+    return StaticString{N,T}(NTuple{N,T}(codeunits(s)))
+end

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 +1,8 @@
+using CommonDataFormat: StaticString
+@testset "StaticString" begin
+    s = "Hello, World!"
+    ss = StaticString(s)
+    @test ss == s
+    @test String(ss) == s
+    @test !isempty(ss)
+end