♻️ Extract file backend into utils subpackage

src/file_backend_native.mbt

@@ -1,117 +1,37 @@
-fn string_to_c_bytes(str : String) -> Bytes {
-  let res : Array[Byte] = []
-  let len = str.length()
-  let mut i = 0
-  while i < len {
-    let mut c = str.code_unit_at(i).to_int()
-    if 0xD800 <= c && c <= 0xDBFF {
-      c -= 0xD800
-      i = i + 1
-      let l = str.code_unit_at(i).to_int() - 0xDC00
-      c = (c << 10) + l + 0x10000
-    }
-    if c < 0x80 {
-      res.push(c.to_byte())
-    } else if c < 0x800 {
-      res.push((0xc0 + (c >> 6)).to_byte())
-      res.push((0x80 + (c & 0x3f)).to_byte())
-    } else if c < 0x10000 {
-      res.push((0xe0 + (c >> 12)).to_byte())
-      res.push((0x80 + ((c >> 6) & 0x3f)).to_byte())
-      res.push((0x80 + (c & 0x3f)).to_byte())
-    } else {
-      res.push((0xf0 + (c >> 18)).to_byte())
-      res.push((0x80 + ((c >> 12) & 0x3f)).to_byte())
-      res.push((0x80 + ((c >> 6) & 0x3f)).to_byte())
-      res.push((0x80 + (c & 0x3f)).to_byte())
-    }
-    i = i + 1
-  }
-  res.push((0).to_byte())
-  Bytes::from_array(res)
+pub type FileHandle = @utils.FileHandle
+
+pub fn open_file_handle_internal(path : String, append : Bool) -> FileHandle? {
+  @utils.open_file_handle_internal(path, append)
 }
 
-#external
-type NativeFileHandle
-
-#borrow(path, mode)
-extern "C" fn file_open_ffi(path : Bytes, mode : Bytes) -> NativeFileHandle = "fopen"
-
-extern "C" fn file_is_null_ffi(handle : NativeFileHandle) -> Bool = "moonbitlang_async_pointer_is_null"
-
-#borrow(buffer)
-extern "C" fn file_write_ffi(
-  buffer : Bytes,
-  size : Int,
-  count : Int,
-  handle : NativeFileHandle,
-) -> Int = "fwrite"
-
-extern "C" fn file_flush_ffi(handle : NativeFileHandle) -> Int = "fflush"
-
-extern "C" fn file_close_ffi(handle : NativeFileHandle) -> Int = "fclose"
-
-extern "C" fn file_seek_ffi(handle : NativeFileHandle, offset : Int, origin : Int) -> Int = "fseek"
-
-extern "C" fn file_tell_ffi(handle : NativeFileHandle) -> Int = "ftell"
-
-#borrow(from_path, to_path)
-extern "C" fn file_rename_ffi(from_path : Bytes, to_path : Bytes) -> Int = "rename"
-
-#borrow(path)
-extern "C" fn file_remove_ffi(path : Bytes) -> Int = "remove"
-
-pub struct FileHandle {
-  path : String
-  raw : NativeFileHandle
+pub fn write_file_handle_internal(handle : FileHandle, content : String) -> Bool {
+  @utils.write_file_handle_internal(handle, content)
 }
 
-fn open_file_handle_internal(path : String, append : Bool) -> FileHandle? {
-  let mode = if append { "ab" } else { "wb" }
-  let raw = file_open_ffi(string_to_c_bytes(path), string_to_c_bytes(mode))
-  if file_is_null_ffi(raw) {
-    None
-  } else {
-    Some({ raw, path })
-  }
+pub fn flush_file_handle_internal(handle : FileHandle) -> Bool {
+  @utils.flush_file_handle_internal(handle)
 }
 
-fn write_file_handle_internal(handle : FileHandle, content : String) -> Bool {
-  let bytes = string_to_c_bytes(content)
-  let written = file_write_ffi(bytes, 1, bytes.length() - 1, handle.raw)
-  written == bytes.length() - 1
+pub fn close_file_handle_internal(handle : FileHandle) -> Bool {
+  @utils.close_file_handle_internal(handle)
 }
 
-fn flush_file_handle_internal(handle : FileHandle) -> Bool {
-  file_flush_ffi(handle.raw) == 0
+pub fn file_size_internal(handle : FileHandle) -> Int {
+  @utils.file_size_internal(handle)
 }
 
-fn close_file_handle_internal(handle : FileHandle) -> Bool {
-  file_close_ffi(handle.raw) == 0
+pub fn rename_file_internal(from_path : String, to_path : String) -> Bool {
+  @utils.rename_file_internal(from_path, to_path)
 }
 
-fn file_size_internal(handle : FileHandle) -> Int {
-  ignore(file_seek_ffi(handle.raw, 0, 2))
-  let size = file_tell_ffi(handle.raw)
-  if size < 0 {
-    0
-  } else {
-    size
-  }
+pub fn remove_file_internal(path : String) -> Bool {
+  @utils.remove_file_internal(path)
 }
 
-fn rename_file_internal(from_path : String, to_path : String) -> Bool {
-  file_rename_ffi(string_to_c_bytes(from_path), string_to_c_bytes(to_path)) == 0
+pub fn string_byte_length_internal(content : String) -> Int {
+  @utils.string_byte_length_internal(content)
 }
 
-fn remove_file_internal(path : String) -> Bool {
-  file_remove_ffi(string_to_c_bytes(path)) == 0
-}
-
-fn string_byte_length_internal(content : String) -> Int {
-  string_to_c_bytes(content).length() - 1
-}
-
-fn native_files_supported_internal() -> Bool {
-  true
+pub fn native_files_supported_internal() -> Bool {
+  @utils.native_files_supported_internal()
 }

src/file_backend_stub.mbt

@@ -1,51 +1,37 @@
-pub struct FileHandle {
-  path : String
+pub type FileHandle = @utils.FileHandle
+
+pub fn open_file_handle_internal(path : String, append : Bool) -> FileHandle? {
+  @utils.open_file_handle_internal(path, append)
 }
 
-fn open_file_handle_internal(path : String, append : Bool) -> FileHandle? {
-  ignore(append)
-  ignore(path)
-  let _unused : FileHandle = { path: "" }
-  ignore(_unused)
-  None
+pub fn write_file_handle_internal(handle : FileHandle, content : String) -> Bool {
+  @utils.write_file_handle_internal(handle, content)
 }
 
-fn write_file_handle_internal(handle : FileHandle, content : String) -> Bool {
-  ignore(handle)
-  ignore(content)
-  false
+pub fn flush_file_handle_internal(handle : FileHandle) -> Bool {
+  @utils.flush_file_handle_internal(handle)
 }
 
-fn flush_file_handle_internal(handle : FileHandle) -> Bool {
-  ignore(handle)
-  false
+pub fn close_file_handle_internal(handle : FileHandle) -> Bool {
+  @utils.close_file_handle_internal(handle)
 }
 
-fn close_file_handle_internal(handle : FileHandle) -> Bool {
-  ignore(handle)
-  false
+pub fn file_size_internal(handle : FileHandle) -> Int {
+  @utils.file_size_internal(handle)
 }
 
-fn file_size_internal(handle : FileHandle) -> Int {
-  ignore(handle)
-  0
+pub fn rename_file_internal(from_path : String, to_path : String) -> Bool {
+  @utils.rename_file_internal(from_path, to_path)
 }
 
-fn rename_file_internal(from_path : String, to_path : String) -> Bool {
-  ignore(from_path)
-  ignore(to_path)
-  false
+pub fn remove_file_internal(path : String) -> Bool {
+  @utils.remove_file_internal(path)
 }
 
-fn remove_file_internal(path : String) -> Bool {
-  ignore(path)
-  false
+pub fn string_byte_length_internal(content : String) -> Int {
+  @utils.string_byte_length_internal(content)
 }
 
-fn string_byte_length_internal(content : String) -> Int {
-  content.length()
-}
-
-fn native_files_supported_internal() -> Bool {
-  false
+pub fn native_files_supported_internal() -> Bool {
+  @utils.native_files_supported_internal()
 }

src/utils/file_backend_native.mbt

@@ -0,0 +1,117 @@
+fn string_to_c_bytes(str : String) -> Bytes {
+  let res : Array[Byte] = []
+  let len = str.length()
+  let mut i = 0
+  while i < len {
+    let mut c = str.code_unit_at(i).to_int()
+    if 0xD800 <= c && c <= 0xDBFF {
+      c -= 0xD800
+      i = i + 1
+      let l = str.code_unit_at(i).to_int() - 0xDC00
+      c = (c << 10) + l + 0x10000
+    }
+    if c < 0x80 {
+      res.push(c.to_byte())
+    } else if c < 0x800 {
+      res.push((0xc0 + (c >> 6)).to_byte())
+      res.push((0x80 + (c & 0x3f)).to_byte())
+    } else if c < 0x10000 {
+      res.push((0xe0 + (c >> 12)).to_byte())
+      res.push((0x80 + ((c >> 6) & 0x3f)).to_byte())
+      res.push((0x80 + (c & 0x3f)).to_byte())
+    } else {
+      res.push((0xf0 + (c >> 18)).to_byte())
+      res.push((0x80 + ((c >> 12) & 0x3f)).to_byte())
+      res.push((0x80 + ((c >> 6) & 0x3f)).to_byte())
+      res.push((0x80 + (c & 0x3f)).to_byte())
+    }
+    i = i + 1
+  }
+  res.push((0).to_byte())
+  Bytes::from_array(res)
+}
+
+#external
+type NativeFileHandle
+
+#borrow(path, mode)
+extern "C" fn file_open_ffi(path : Bytes, mode : Bytes) -> NativeFileHandle = "fopen"
+
+extern "C" fn file_is_null_ffi(handle : NativeFileHandle) -> Bool = "moonbitlang_async_pointer_is_null"
+
+#borrow(buffer)
+extern "C" fn file_write_ffi(
+  buffer : Bytes,
+  size : Int,
+  count : Int,
+  handle : NativeFileHandle,
+) -> Int = "fwrite"
+
+extern "C" fn file_flush_ffi(handle : NativeFileHandle) -> Int = "fflush"
+
+extern "C" fn file_close_ffi(handle : NativeFileHandle) -> Int = "fclose"
+
+extern "C" fn file_seek_ffi(handle : NativeFileHandle, offset : Int, origin : Int) -> Int = "fseek"
+
+extern "C" fn file_tell_ffi(handle : NativeFileHandle) -> Int = "ftell"
+
+#borrow(from_path, to_path)
+extern "C" fn file_rename_ffi(from_path : Bytes, to_path : Bytes) -> Int = "rename"
+
+#borrow(path)
+extern "C" fn file_remove_ffi(path : Bytes) -> Int = "remove"
+
+pub struct FileHandle {
+  path : String
+  raw : NativeFileHandle
+}
+
+pub fn open_file_handle_internal(path : String, append : Bool) -> FileHandle? {
+  let mode = if append { "ab" } else { "wb" }
+  let raw = file_open_ffi(string_to_c_bytes(path), string_to_c_bytes(mode))
+  if file_is_null_ffi(raw) {
+    None
+  } else {
+    Some({ raw, path })
+  }
+}
+
+pub fn write_file_handle_internal(handle : FileHandle, content : String) -> Bool {
+  let bytes = string_to_c_bytes(content)
+  let written = file_write_ffi(bytes, 1, bytes.length() - 1, handle.raw)
+  written == bytes.length() - 1
+}
+
+pub fn flush_file_handle_internal(handle : FileHandle) -> Bool {
+  file_flush_ffi(handle.raw) == 0
+}
+
+pub fn close_file_handle_internal(handle : FileHandle) -> Bool {
+  file_close_ffi(handle.raw) == 0
+}
+
+pub fn file_size_internal(handle : FileHandle) -> Int {
+  ignore(file_seek_ffi(handle.raw, 0, 2))
+  let size = file_tell_ffi(handle.raw)
+  if size < 0 {
+    0
+  } else {
+    size
+  }
+}
+
+pub fn rename_file_internal(from_path : String, to_path : String) -> Bool {
+  file_rename_ffi(string_to_c_bytes(from_path), string_to_c_bytes(to_path)) == 0
+}
+
+pub fn remove_file_internal(path : String) -> Bool {
+  file_remove_ffi(string_to_c_bytes(path)) == 0
+}
+
+pub fn string_byte_length_internal(content : String) -> Int {
+  string_to_c_bytes(content).length() - 1
+}
+
+pub fn native_files_supported_internal() -> Bool {
+  true
+}

src/utils/file_backend_stub.mbt

@@ -0,0 +1,51 @@
+pub struct FileHandle {
+  path : String
+}
+
+pub fn open_file_handle_internal(path : String, append : Bool) -> FileHandle? {
+  ignore(append)
+  ignore(path)
+  let _unused : FileHandle = { path: "" }
+  ignore(_unused)
+  None
+}
+
+pub fn write_file_handle_internal(handle : FileHandle, content : String) -> Bool {
+  ignore(handle)
+  ignore(content)
+  false
+}
+
+pub fn flush_file_handle_internal(handle : FileHandle) -> Bool {
+  ignore(handle)
+  false
+}
+
+pub fn close_file_handle_internal(handle : FileHandle) -> Bool {
+  ignore(handle)
+  false
+}
+
+pub fn file_size_internal(handle : FileHandle) -> Int {
+  ignore(handle)
+  0
+}
+
+pub fn rename_file_internal(from_path : String, to_path : String) -> Bool {
+  ignore(from_path)
+  ignore(to_path)
+  false
+}
+
+pub fn remove_file_internal(path : String) -> Bool {
+  ignore(path)
+  false
+}
+
+pub fn string_byte_length_internal(content : String) -> Int {
+  content.length()
+}
+
+pub fn native_files_supported_internal() -> Bool {
+  false
+}

src/utils/moon.pkg

@@ -4,3 +4,10 @@ import {
   "moonbitlang/core/json",
   "moonbitlang/core/ref",
 }
+
+options(
+  targets: {
+    "file_backend_native.mbt": [ "native", "llvm" ],
+    "file_backend_stub.mbt": [ "js", "wasm", "wasm-gc" ],
+  },
+)