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Update to use new Streams algorithms #225

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Sep 15, 2020
Merged

Update to use new Streams algorithms #225

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41 changes: 20 additions & 21 deletions index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -907,11 +907,8 @@ Similarly, when piping a {{ReadableStream}} into a {{FileSystemWritableFileStrea
To <dfn>create a new FileSystemWritableFileStream</dfn> given a [=file entry=] |file|
in a [=/Realm=] |realm|, perform the following steps:

1. Let |stream| be a new {{FileSystemWritableFileStream}} in |realm|.
1. Perform [$InitializeWritableStream$](|stream|)
1. Let |stream| be a [=new=] {{FileSystemWritableFileStream}} in |realm|.
1. Set |stream|.[=FileSystemWritableFileStream/[[file]]=] to |file|.
1. Let |controller| be a new {{WritableStreamDefaultController}}.
1. Let |startAlgorithm| be an algorithm that returns `undefined`.
1. Let |writeAlgorithm| be an algorithm which takes a |chunk| argument
and returns the result of running the [=write a chunk=] algorithm with |stream| and |chunk|.
1. Let |closeAlgorithm| be the following steps:
Expand All @@ -931,10 +928,13 @@ in a [=/Realm=] |realm|, perform the following steps:
being written to.
1. [=/Resolve=] |closeResult| with `undefined`.
1. Return |closeResult|.
1. Let |abortAlgorithm| be an algorithm that returns [=a promise resolved with=] `undefined`.
1. Let |highWaterMark| be 1.
1. Let |sizeAlgorithm| be an algorithm that returns `1`.
1. Perform [$SetUpWritableStreamDefaultController$](|stream|, |controller|, |startAlgorithm|, |writeAlgorithm|, |closeAlgorithm|, |abortAlgorithm|, |highWaterMark|, |sizeAlgorithm|).
1. [=WritableStream/Set up=] |stream| with <a for="WritableStream/set up"><var
ignore>writeAlgorithm</var></a> set to |writeAlgorithm|, <a for="WritableStream/set up"><var
ignore>closeAlgorithm</var></a> set to |closeAlgorithm|, <a for="WritableStream/set up"><var
ignore>highWaterMark</var></a> set to |highWaterMark|, and <a for="WritableStream/set up"><var
ignore>sizeAlgorithm</var></a> set to |sizeAlgorithm|.
1. Return |stream|.

</div>
Expand Down Expand Up @@ -1058,9 +1058,10 @@ runs these steps:
The <dfn method for=FileSystemWritableFileStream>write(|data|)</dfn> method, when invoked, must run
these steps:

1. Let |writer| be the result of calling [$AcquireWritableStreamDefaultWriter$](<b>[=this=]</b>).
1. Let |result| be [$WritableStreamDefaultWriterWrite$](|writer|, |data|).
1. Perform [$WritableStreamDefaultWriterRelease$](|writer|).
1. Let |writer| be the result of [=WritableStream/getting a writer=] for [=this=].
1. Let |result| be the result of [=WritableStreamDefaultWriter/writing a chunk=] to |writer| given
|data|.
1. [=WritableStreamDefaultWriter/Release=] |writer|.
1. Return |result|.

</div>
Expand All @@ -1076,12 +1077,11 @@ these steps:
The <dfn method for=FileSystemWritableFileStream>seek(|position|)</dfn> method, when invoked, must run these
steps:

1. Let |writer| be the result of calling [$AcquireWritableStreamDefaultWriter$](<b>[=this=]</b>).
1. Let |result| be [$WritableStreamDefaultWriterWrite$](|writer|,
<code>{<l>{{WriteParams/type}}</l>: {{WriteCommandType/"seek"}},
<l>{{WriteParams/position}}</l>: |position|,
<l>{{WriteParams/size}}</l>: undefined, <l>{{WriteParams/data}}</l>: undefined}</code>).
1. Perform [$WritableStreamDefaultWriterRelease$](|writer|).
1. Let |writer| be the result of [=WritableStream/getting a writer=] for [=this=].
1. Let |result| be the result of [=WritableStreamDefaultWriter/writing a chunk=] to |writer| given
«[ "{{WriteParams/type}}" → {{WriteCommandType/"seek"}}, "{{WriteParams/position}}" →
|position| ]».
1. [=WritableStreamDefaultWriter/Release=] |writer|.
1. Return |result|.

</div>
Expand All @@ -1105,12 +1105,11 @@ steps:
The <dfn method for=FileSystemWritableFileStream>truncate(|size|)</dfn> method, when invoked, must run these
steps:

1. Let |writer| be the result of calling [$AcquireWritableStreamDefaultWriter$](<b>[=this=]</b>).
1. Let |result| be [$WritableStreamDefaultWriterWrite$](|writer|,
<code>{<l>{{WriteParams/type}}</l>: {{WriteCommandType/"truncate"}},
<l>{{WriteParams/size}}</l>: |size|,
<l>{{WriteParams/position}}</l>: undefined, <l>{{WriteParams/data}}</l>: undefined}</code>).
1. Perform [$WritableStreamDefaultWriterRelease$](|writer|).
1. Let |writer| be the result of [=WritableStream/getting a writer=] for [=this=].
1. Let |result| be the result of [=WritableStreamDefaultWriter/writing a chunk=] to |writer| given
«[ "{{WriteParams/type}}" → {{WriteCommandType/"truncate"}}, "{{WriteParams/size}}" →
|size| ]».
1. [=WritableStreamDefaultWriter/Release=] |writer|.
1. Return |result|.

</div>
Expand Down