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add "throw" option #25

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add "throw" option #25

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11 changes: 8 additions & 3 deletions spec.emu
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ copyright: false
1. Let _error_ be ThrowCompletion(a newly created *RangeError* object).
1. Return ? IteratorClose(_iterated_, _error_).
1. If _undersized_ is *undefined*, set _undersized_ to *"discard"*.
1. If _undersized_ is neither *"discard"* nor *"truncate"*, then
1. If _undersized_ is not one of *"discard"*, *"truncate"*, or *"throw"*, then
1. Let _error_ be ThrowCompletion(a newly created *TypeError* object).
1. Return ? IteratorClose(_iterated_, _error_).
1. Set _iterated_ to ? GetIteratorDirect(_O_).
Expand All @@ -59,8 +59,13 @@ copyright: false
1. Repeat,
1. Let _value_ be ? IteratorStepValue(_iterated_).
1. If _value_ is ~done~, then
1. If _undersized_ is *"truncate"*, _buffer_ is not empty, and the number of elements in _buffer_ < ℝ(_windowSize_), then
1. Perform Completion(Yield(CreateArrayFromList(_buffer_))).
1. If _buffer_ is not empty and the number of elements in _buffer_ < ℝ(_windowSize_), then
1. If _undersized_ is *"truncate"*, then
1. Perform Completion(Yield(CreateArrayFromList(_buffer_))).
1. Else if _undersized_ is *"throw"*, then
1. Throw a newly created *RangeError* object.
1. Else,
1. Assert: _undersized_ is *"discard"*.
1. Return ReturnCompletion(*undefined*).
1. If the number of elements in _buffer_ is ℝ(_windowSize_), then
1. Remove the first element from _buffer_.
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