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We were previously assuming that dictionary members were always required when being returned. This is a bit of a weird case, because unlike _input_ dictionaries which the spec marks as required, 'result' dictionaries do not seem to be marked in spec IDL as required. This is still fine from the POV that the spec is written as it states that we should only be putting the values into the dictionary if the value exists. We could do this through some metaprogramming constexpr type checks. For example, if the type in our C++ representation was not an Optional, we can skip the has_value check. Instead of doing that, change the IDL of the result dictionaries to annotate these members so that the IDL generator knows this information up front. While all current cases have every single member returned or not returned, it is conceivable that the spec could have a situation that one member is always returned (and should get marked as required), while the others are optionally returned. Therefore, this new GenerateAsRequired attribute is applied for each individual member.
31 lines
1.3 KiB
Text
31 lines
1.3 KiB
Text
#import <WebAudio/BaseAudioContext.idl>
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// https://www.w3.org/TR/webaudio/#enumdef-audiocontextlatencycategory
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enum AudioContextLatencyCategory { "balanced", "interactive", "playback" };
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// https://webaudio.github.io/web-audio-api/#AudioContext
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[Exposed=Window]
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interface AudioContext : BaseAudioContext {
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constructor(optional AudioContextOptions contextOptions = {});
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readonly attribute double baseLatency;
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readonly attribute double outputLatency;
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AudioTimestamp getOutputTimestamp ();
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Promise<undefined> resume ();
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Promise<undefined> suspend ();
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Promise<undefined> close ();
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MediaElementAudioSourceNode createMediaElementSource (HTMLMediaElement mediaElement);
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[FIXME] MediaStreamAudioSourceNode createMediaStreamSource (MediaStream mediaStream);
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[FIXME] MediaStreamTrackAudioSourceNode createMediaStreamTrackSource (MediaStreamTrack mediaStreamTrack);
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[FIXME] MediaStreamAudioDestinationNode createMediaStreamDestination ();
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};
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dictionary AudioContextOptions {
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AudioContextLatencyCategory latencyHint = "interactive";
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float sampleRate;
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};
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dictionary AudioTimestamp {
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[GenerateAsRequired] double contextTime;
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// FIXME: Should be DOMHighResTimeStamp, but DOMHighResTimeStamp doesn't get parsed as a double during codegen
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[GenerateAsRequired] double performanceTime;
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};
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