Add StringViews extension

This allows `MemoryView(::StringView)` to work.

Project.toml

@@ -3,14 +3,22 @@ uuid = "a791c907-b98b-4e44-8f4d-e4c2362c6b2f"
 version = "0.2.1"
 authors = ["Jakob Nybo Nissen <[email protected]>"]
 
+[weakdeps]
+StringViews = "354b36f9-a18e-4713-926e-db85100087ba"
+
 [compat]
 Aqua = "0.8.7"
+StringViews = "1"
 Test = "1.11"
 julia = "1.11"
 
+[extensions]
+StringViewsExt = "StringViews"
+
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
+StringViews = "354b36f9-a18e-4713-926e-db85100087ba"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Aqua", "Test"]
+test = ["Aqua", "StringViews", "Test"]

ext/StringViewsExt.jl

@@ -0,0 +1,9 @@
+module StringViewsExt
+
+using StringViews: StringView
+import MemoryViews: MemoryView, MemoryKind
+
+MemoryView(s::StringView) = MemoryView(codeunits(s))
+MemoryKind(::Type{StringView{A}}) where {A} = MemoryKind(A)
+
+end # module

test/runtests.jl

@@ -1,6 +1,7 @@
 using Test
 using MemoryViews
 using Aqua
+using StringViews: StringView
 
 MemoryViews.MemoryView(s::GenericString) = MemoryView(s.string)
 
@@ -435,4 +436,23 @@ end
     @test_throws Exception inner(NotMemory())
 end
 
+@testset "StringViews" begin
+    # Backed by mutable array
+    s = StringView([0x01, 0x02])
+    @test MemoryView(s) isa MutableMemoryView{UInt8}
+    @test MemoryView(s) == [0x01, 0x02]
+    @test MemoryKind(typeof(s)) == IsMemory{MutableMemoryView{UInt8}}()
+
+    # Backed by immutable string data
+    s = StringView(view(codeunits("abcd"), 2:4))
+    @test MemoryView(s) isa ImmutableMemoryView{UInt8}
+    @test MemoryView(s) == codeunits("bcd")
+    @test MemoryKind(typeof(s)) == IsMemory{ImmutableMemoryView{UInt8}}()
+
+    # Not backed by memory
+    s = StringView(view(0x61:0x65, 2:4))
+    @test_throws MethodError MemoryView(s)
+    @test MemoryKind(typeof(s)) == NotMemory()
+end
+
 Aqua.test_all(MemoryViews)