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Documentation for GetSpanContents engine call #1362

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Apr 30, 2024
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Documentation for GetSpanContents engine call #1362

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21 changes: 21 additions & 0 deletions contributor-book/plugin_protocol_reference.md
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Expand Up @@ -806,6 +806,27 @@ Example:
}
```

#### `GetSpanContents` engine call

Get the contents of a [`Span`](#span) from the engine. This can be used for viewing the source code that generated a value. The argument is a [`Span`](#span). The response on success is [`Value` pipeline data](3pipelinedataheader-value) containing a [`Binary`](#binary) value, as the result is not guaranteed to be valid UTF-8.

Example:

```json
{
"EngineCall": {
"context": 40,
"id": 72,
"call": {
"GetSpanContents": {
"start": 38881,
"end": 39007
}
}
}
}
```

#### `EvalClosure` engine call

Pass a [`Closure`](#closure) and arguments to the engine to be evaluated. Returns a [`PipelineData` response](#pipelinedata-engine-call-response) if successful with the output of the closure, which may be a stream.
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