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### 2. On Windows, install the .NET 4.5.1 Targeting Pack
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### 2. On Windows, install the .NET 4.5.2 Targeting Pack
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**NOTE: This is only necessary if you don't have Visual Studio installed**
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If you try to build the code and receive an error about a missing .NET 4.5.1
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If you try to build the code and receive an error about a missing .NET 4.5.2
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Targeting Pack, you should download and install the [.NET Framework 4.5.2 Developer Pack](https://www.microsoft.com/en-us/download/details.aspx?id=42637).
The Find-Ast function can be used to easily find a specific AST within a script file. All ASTs following the inital starting ast will be searched, including those that are not part of the same tree.
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The Find-Ast function can be used to easily find a specific AST within a script file. All ASTs following the initial starting AST will be searched, including those that are not part of the same tree.
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The behavior of the search (such as direction and criteria) can be changed with parameters.
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Additionally, you can find the Ast closest to the cursor with the "AtCursor" switch parameter.
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Additionally, you can find the AST closest to the cursor with the "AtCursor" switch parameter.
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## EXAMPLES
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Find-Ast
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```
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Returns all asts in the currently open file in the editor.
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Returns all ASTs in the currently open file in the editor.
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### -------------------------- EXAMPLE 2 --------------------------
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```powershell
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Find-Ast -First -IncludeStartingAst
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```
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Returns the top level ast in the currently open file in the editor.
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Returns the top level AST in the currently open file in the editor.
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### -------------------------- EXAMPLE 3 --------------------------
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```powershell
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Find-Ast { $PSItem -is [FunctionDefinitionAst] }
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```
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Returns all function definition asts in the ast of file currently open in the editor.
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Returns all function definition ASTs in the AST of file currently open in the editor.
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### -------------------------- EXAMPLE 4 --------------------------
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This example sets the required PowerShell version in a module manifest to 4.0.
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First it finds the AST of the PowerShellVersion manifest field, then finds the first AST directly after it and changes the text to '4.0'. This will not work as is if the field is commented.
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First it finds the AST of the PowerShellVersion manifest field, then finds the first AST directly after it and changes the text to '4.0'. This will not work if the field is commented.
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### -------------------------- EXAMPLE 7 --------------------------
This example gets a list of all parameters that belong to the parameter set 'ByPosition'. First it uses the ArgumentName and Argument properties of NamedAttributeArgumentAst to find the ASTs of arguments to the Parameter attribute that declare the the parameter set 'ByPosition'. It then finds the closest parent ParameterAst and retrieves the name from it.
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This example gets a list of all parameters that belong to the 'ByPosition' parameter set. First it uses the ArgumentName and Argument properties of NamedAttributeArgumentAst to find the ASTs of arguments to the Parameter attribute that declare the 'ByPosition' parameter set. It then finds the closest parent ParameterAst and retrieves the name from it.
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### -------------------------- EXAMPLE 8 --------------------------
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### -FilterScript
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Specifies a ScriptBlock that returns $true if an AST should be returned. Uses $PSItem and $_ like Where-Object. If not specified all ASTs will be returned.
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Specifies a script block that returns $true if an AST should be returned. Uses $PSItem and $_ like Where-Object. If not specified all ASTs will be returned.
If specified will only search ancestors of the starting AST. This is a convenience parameter that acts the same as the "Family" and "Before" parameters when used together.
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Searches only ancestors of the starting AST. This is a convenience parameter that acts the same as the "Family" and "Before" parameters when used together.
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