Add WriteableStream support

Author: YourFin

CHANGELOG.md

@@ -7,6 +7,7 @@ Notable changes to this project are documented in this file. The format is based
 Breaking changes:
 
 New features:
+ - Add WriteableStream support (#9)
 
 Bugfixes:
 

src/Web/Streams/Sink.js

@@ -0,0 +1,24 @@
+export function _make(options) {
+  var newOptions = {};
+  if (options.start) {
+    newOptions.start = function(controller) {
+      return options.start(controller)();
+    };
+  }
+  if (options.write) {
+    newOptions.write = function(chunk, controller) {
+      return options.write(controller)(chunk)();
+    };
+  }
+  if (options.close) {
+    newOptions.close = function(controller) {
+      return options.close(controller)();
+    };
+  }
+  if (options.abort) {
+    newOptions.abort = function(reason) {
+      return options.abort(reason)();
+    };
+  }
+  return newOptions;
+}

src/Web/Streams/Sink.purs

@@ -0,0 +1,26 @@
+module Web.Streams.Sink
+  ( Sink
+  , Optional
+  , make
+  ) where
+
+import Effect (Effect)
+import Effect.Exception (Error)
+import Prelude (Unit)
+import Prim.Row as Row
+import Web.Promise (Promise)
+import Web.Streams.WritableStreamController (WritableStreamController)
+
+type Optional chunk =
+  ( start :: WritableStreamController chunk -> Effect (Promise Unit)
+  , write :: WritableStreamController chunk -> chunk -> Effect (Promise Unit)
+  , close :: WritableStreamController chunk -> Effect (Promise Unit)
+  , abort :: Error -> Effect (Promise Unit)
+  )
+
+foreign import data Sink :: Type -> Type
+
+make :: forall r rx chunk. Row.Union r rx (Optional chunk) => { | r } -> Sink chunk
+make = _make
+
+foreign import _make :: forall r chunk. { | r } -> Sink chunk

src/Web/Streams/WritableStream.js

@@ -0,0 +1,27 @@
+export function _new(source, strategy) {
+  return new WritableStream(source, strategy);
+}
+
+export function close(stream) {
+  return function() {
+    return stream.close();
+  };
+}
+
+export function _abort(stream, reason) {
+  return function() {
+    return stream.abort(reason);
+  };
+}
+
+export function locked(stream) {
+  return function() {
+    return stream.locked;
+  };
+}
+
+export function getWriter(stream) {
+  return function() {
+    return stream.getWriter();
+  };
+}

src/Web/Streams/WritableStream.purs

@@ -0,0 +1,37 @@
+module Web.Streams.WritableStream
+  ( WritableStream
+  , new
+  , abort
+  , close
+  , getWriter
+  , locked
+  ) where
+
+import Data.Maybe (Maybe)
+import Data.Nullable (Nullable, toNullable)
+import Effect (Effect)
+import Effect.Exception (Error)
+import Effect.Uncurried (EffectFn2, runEffectFn2)
+import Prelude (Unit)
+import Web.Promise (Promise)
+import Web.Streams.QueuingStrategy (QueuingStrategy)
+import Web.Streams.Sink (Sink)
+import Web.Streams.Writer (Writer)
+
+foreign import data WritableStream :: Type -> Type
+
+foreign import _new :: forall chunk. EffectFn2 (Sink chunk) (Nullable (QueuingStrategy chunk)) (WritableStream chunk)
+
+new :: forall chunk. Sink chunk -> Maybe (QueuingStrategy chunk) -> Effect (WritableStream chunk)
+new source strategy = runEffectFn2 _new source (toNullable strategy)
+
+foreign import _abort :: forall chunk. EffectFn2 (WritableStream chunk) Error (Promise Unit)
+
+abort :: forall chunk. WritableStream chunk -> Error -> Effect (Promise Unit)
+abort = runEffectFn2 _abort
+
+foreign import close :: forall chunk. WritableStream chunk -> Effect (Promise Unit)
+
+foreign import getWriter :: forall chunk. WritableStream chunk -> Effect (Writer chunk)
+
+foreign import locked :: forall chunk. WritableStream chunk -> Effect Boolean

src/Web/Streams/WritableStreamController.js

@@ -0,0 +1,7 @@
+export function error(error) {
+  return function(controller) {
+    return function() {
+      return controller.error(error);
+    };
+  };
+}

src/Web/Streams/WritableStreamController.purs

@@ -0,0 +1,9 @@
+module Web.Streams.WritableStreamController where
+
+import Effect (Effect)
+import Effect.Exception (Error)
+import Prelude (Unit)
+
+foreign import data WritableStreamController :: Type -> Type
+
+foreign import error :: forall chunk. WritableStreamController chunk -> Error -> Effect Unit

src/Web/Streams/Writer.js

@@ -0,0 +1,17 @@
+export function _write(writer, chunk) {
+  return function() {
+    return writer.write(chunk);
+  };
+}
+
+export function ready(writer) {
+  return function() {
+    return writer.ready;
+  };
+}
+
+export function close(writer) {
+  return function() {
+    return writer.close();
+  };
+}

src/Web/Streams/Writer.purs

@@ -0,0 +1,20 @@
+module Web.Streams.Writer
+  ( Writer
+  , write
+  ) where
+
+import Effect (Effect)
+import Effect.Uncurried (EffectFn2, runEffectFn2)
+import Prelude (Unit)
+import Web.Promise (Promise)
+
+foreign import data Writer :: Type -> Type
+
+foreign import _write :: forall chunk. EffectFn2 (Writer chunk) chunk (Promise Unit)
+
+write :: forall chunk. Writer chunk -> chunk -> Effect (Promise Unit)
+write = runEffectFn2 _write
+
+foreign import ready :: forall chunk. Writer chunk -> Effect (Promise Unit)
+
+foreign import close :: forall chunk. Writer chunk -> Effect (Promise Unit)