Public/ConvertTo-String.ps1
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function ConvertTo-String { <# .SYNOPSIS Converts a mermaid definition to string. .DESCRIPTION Generates mermaid syntax for definitions created with this module. .INPUTS Mermaid diagram definition object. .OUTPUTS String. .EXAMPLE PS C:\> $diagram = New-MermaidDiagram -Type erDiagram PS C:\> $diagram | Add-MermaidRelation Exactly-one Customer places Zero-or-more Order PS C:\> $diagram | Add-MermaidRelation Exactly-one Order contains One-or-more LineItem PS C:\> $diagram | Add-MermaidRelation One-or-more Customer uses One-or-more DeliveryAddress -NonIdentifying PS C:\> $diagram | ConvertTo-MermaidString erDiagram Customer ||--o{ Order : places Order ||--|{ LineItem : contains Customer }|..|{ DeliveryAddress : uses Create a erDiagram, add a few relations and convert it to a diagram string. #> [CmdletBinding()] param ( #region erDiagram # The diagram type. [Parameter(Mandatory, ValueFromPipelineByPropertyName, ParameterSetName = 'erDiagram')] [string] $Type, # Collection of relations. [Parameter(Mandatory, ValueFromPipelineByPropertyName, ParameterSetName = 'erDiagram')] [PsObject[]] $Relations, #end region #region erRelation # First entity of the relation. [Parameter(Mandatory, ValueFromPipelineByPropertyName, ParameterSetName = 'erRelation')] [string] $FirstEntity, # Relationship of the relation. [Parameter(ValueFromPipelineByPropertyName, ParameterSetName = 'erRelation')] [PSObject] $Relationship, # First second of the relation. [Parameter(ValueFromPipelineByPropertyName, ParameterSetName = 'erRelation')] [string] $SecondEntity, # Describes the relation. [Parameter(ValueFromPipelineByPropertyName, ParameterSetName = 'erRelation')] [string] $Label, #end region #region erRelationship # Cardinality of the first entity. [Parameter(Mandatory, ValueFromPipelineByPropertyName, ParameterSetName = 'erRelationship')] [string] $FirstCardinality, # Cardinality of the second entity. [Parameter(Mandatory, ValueFromPipelineByPropertyName, ParameterSetName = 'erRelationship')] [string] $SecondCardinality, # Flags if one entity may exist without the other. [Parameter(Mandatory, ValueFromPipelineByPropertyName, ParameterSetName = 'erRelationship')] [bool] $Identifying #end region ) process { @( switch ($PSCmdlet.ParameterSetName) { erDiagram { $Type | Write-Output $Relations | ConvertTo-String | Write-Output } erRelation { if ( $SecondEntity ) { Write-Output " $FirstEntity $( $Relationship | ConvertTo-String ) $SecondEntity$( if ( $Label ) {" : $Label" })" } else { Write-Output " $FirstEntity" } } erRelationship { $FirstCardinalityCode = switch ($FirstCardinality) { Zero-or-one { '|o' } Exactly-one { '||' } Zero-or-more { '{o' } One-or-more { '}|' } Default { Write-Error "'$_' is not supported for FirstCardinality." } } $SecondCardinalityCode = switch ($SecondCardinality) { Zero-or-one { 'o|' } Exactly-one { '||' } Zero-or-more { 'o{' } One-or-more { '|{' } Default { Write-Error "'$_' is not supported for SecondCardinality." } } $IdentifyingCode = if ( $Identifying ) { '--' } else { '..' } Write-Output "$FirstCardinalityCode$IdentifyingCode$SecondCardinalityCode" } Default { Write-Error "convert $_ is not supported." } } ) -join [Environment]::NewLine | Write-Output } } |