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kelnishi
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Apr 27, 2026
Adds directory iteration — guests walking a tree call
read-directory once per directory and pull entries via
read-directory-entry until None signals exhausted.
read-directory() -> result<own<directory-entry-stream>, error-code>
resource directory-entry-stream {
read-directory-entry: func()
-> result<option<directory-entry>, error-code>;
}
record directory-entry {
type: descriptor-type,
name: string,
}
Types added:
- DirectoryEntry class (Type: DescriptorType, Name: string)
- DirectoryEntryStream resource — array-backed by default;
pos cursor advances on each ReadDirectoryEntry call;
null when exhausted.
Descriptor.ReadDirectory() default impl walks
Directory.EnumerateDirectories + Directory.EnumerateFiles
on the underlying Path, builds a DirectoryEntry[] with
the appropriate DescriptorType per entry. Subclasses
override for VFS shims.
WasiInterfaceBinder.BindStreamResultResourceMethod gains
return shape #13: option<directory-entry>. 20-byte total
layout:
- +0: outer disc (Ok)
- +4: option disc (None=0, Some=1)
- +8: type (u8)
- +12: name ptr (i32)
- +16: name len (i32)
When Some: type byte at +8, name UTF-8 bytes allocated
via cabi_realloc with (ptr, len) at +12/+16.
WIT keyword "type" can't be used as a field name without
escaping; the dep .wit uses "%type" to satisfy
wasm-tools.
wasi-fs-readdir-component fixture: hand-written WAT
chains read-directory → read-directory-entry, packs
(option-disc, type, name-len, first-name-byte) into a u32.
Stub yields ("first.txt", RegularFile) as the first entry;
test asserts each packed byte matches.
Test counts (sequential): 603 transpiler + 344 component-
model + 7 bindgen + 73 WASI.Preview2 = 1027/1027 passing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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