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# FlattenParseTree(IParseTree)

Method in [Compiler](/2.5/api/csharp/yarn.compiler/yarn.compiler.compiler.md)

## Summary

Flattens a tree of `Antlr4.Runtime.Tree.IParseTree` objects by recursively visiting their children, and converting them into a flat ``System.Collections.Generic.IEnumerable`1`` .

```csharp
public static IEnumerable<IParseTree> FlattenParseTree(IParseTree node)
```

## Parameters

| Name                                  | Description                       |
| ------------------------------------- | --------------------------------- |
| `Antlr4.Runtime.Tree.IParseTree` node | The root node to begin work from. |

## Returns

An ``System.Collections.Generic.IEnumerable`1`` that contains a flattened version of the hierarchy rooted at `node` .