dbatools

1.0.162

internal/functions/Get-ObjectNameParts.ps1

                                function Get-ObjectNameParts {

    <#

    .SYNOPSIS

        Parse a one, two, or three part object name into seperate paths

    .DESCRIPTION

        Takes a one, two or three part object name and splits them into Database, Schema and Name

    .PARAMETER ObjectName

        The object name to parse. You can specify a one, two, or three part object name.

        If the object has special characters they must be wrapped in square brackets [ ].

        If the name contains character ']' this must be escaped by duplicating the character

    .NOTES

        Tags: Object, Internal

        Author: Patrick Flynn (@sqllensman)

        Website: https://dbatools.io

        Copyright: (c) 2018 by dbatools, licensed under MIT

        License: MIT https://opensource.org/licenses/MIT

    .EXAMPLE

        Get-ObjectNameParts -ObjectName 'table'

        Parses a three-part name into its constitute parts.

    .EXAMPLE

        Get-ObjectNameParts -ObjectName '[Bad. Name]]].[Schema.With.Dots]]].[Another .Silly]] Name..]'

        Parses a three-part name into its constitute parts. Uses square brackets to enclose special characters.

    #>

    param (

        [string]$ObjectName

    )

    process {

        $fqtns = @()

        #Object names with a ']' charcter in the name need to be handeled

        #Require charcter to be escaped by being duplicated as per T-SQL QuoteName function

        #These need to be temporarily replaced to allow the object name to be parsed.

        $t = $ObjectName

        if ($t.Contains(']]')) {

            for ($i = 0; $i -le 65535; $i++) {

                $hexStr = '{0:X4}' -f $i

                $char = [regex]::Unescape("\u$($HexStr)")

                if (!$ObjectName.Contains($Char)) {

                    $fixChar = $Char

                    $t = $t.Replace(']]', $fixChar)

                    Break

                }

            }

        } else {

            $fixChar = $null

        }

        $splitName = [regex]::Matches($t, "(\[.+?\])|([^\.]+)").Value

        $dotcount = $splitName.Count

        $dbName = $schema = $name = $null

        switch ($dotcount) {

            1 {

                $name = $t

                $parsed = $true

            }

            2 {

                $schema = $splitName[0]

                $name = $splitName[1]

                $parsed = $true

            }

            3 {

                $dbName = $splitName[0]

                $schema = $splitName[1]

                $name = $splitName[2]

                $parsed = $true

            }

            default {

                $parsed = $false

            }

        }

        if ($dbName -like "[[]*[]]") {

            $dbName = $dbName.Substring(1, ($dbName.Length - 2))

            if ($fixChar) {

                $dbName = $dbName.Replace($fixChar, ']')

            }

        }

        if ($schema -like "[[]*[]]") {

            $schema = $schema.Substring(1, ($schema.Length - 2))

            if ($fixChar) {

                $schema = $schema.Replace($fixChar, ']')

            }

        }

        if ($name -like "[[]*[]]") {

            $name = $name.Substring(1, ($name.Length - 2))

            if ($fixChar) {

                $name = $name.Replace($fixChar, ']')

            }

        }

        $fqtns = [PSCustomObject] @{

            InputValue = $ObjectName

            Database   = $dbName

            Schema     = $schema

            Name       = $name

            Parsed     = $parsed

        }

        return $fqtns

    }

}

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