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# XCSourceEditorCommand

The protocol you implement to handle command invocations in a source editor extension.

```
protocol XCSourceEditorCommand : NSObjectProtocol
```

## Overview

A one-to-one mapping between command classes and commands is not required—multiple commands can be handled by a single class, by checking their invocation’s `commandIdentifier` at runtime.

## Topics

### Defining Editor Commands

[`XCSourceEditorCommandDefinitionKey`](/documentation/XcodeKit/XCSourceEditorCommandDefinitionKey)

A key in the dictionary that defines a source editor command.

### Handling Editor Commands

[`perform(with:completionHandler:)`](/documentation/XcodeKit/XCSourceEditorCommand/perform(with:completionHandler:))

Performs the action associated with the command using the information in an invocation.


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