Public/ConvertFrom-HTML.ps1
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function ConvertFrom-Html { <# .SYNOPSIS Takes an HTML input and converts it to an HTMLAgilityPack htmlNode object that can be navigated using Linq .DESCRIPTION Long description .EXAMPLE $HTMLString = @' <!DOCTYPE html> <html> <body> <h1>My First Heading</h1> <p>My first paragraph.</p>d </body> </html> '@ | ConvertFrom-HTML $HTMLString NodeType Name AttributeCount ChildNodeCount ContentLength InnerText -------- ---- -------------- -------------- ------------- --------- Document #document 0 4 103 … $HTMLString.SelectSingleNode('//body/h1') NodeType Name AttributeCount ChildNodeCount ContentLength InnerText -------- ---- -------------- -------------- ------------- --------- Element h1 0 1 16 My First Heading Convert HTML string to a HtmlNode via the pipeline. .EXAMPLE $uri = [Uri]'https://www.powershellgallery.com/' | ConvertFrom-HTML $uri NodeType Name AttributeCount ChildNodeCount ContentLength InnerText -------- ---- -------------- -------------- ------------- --------- Document #document 0 4 17550 … Fetch and parse a url. .EXAMPLE Get-Item $testFilePath | ConvertFrom-Html NodeType Name AttributeCount ChildNodeCount ContentLength InnerText -------- ---- -------------- -------------- ------------- --------- Document #document 0 5 105 … Parse an HTML file piped from Get-Item. .INPUTS [String[]] [System.IO.FileInfo[]] [System.URI[]] .OUTPUTS [HtmlAgilityPack.HtmlDocument] [HtmlAgilityPack.HtmlNode] .NOTES General notes #> [OutputType([HtmlAgilityPack.HtmlNode])] [OutputType([HtmlAgilityPack.HtmlDocument])] [CmdletBinding(DefaultParameterSetName = 'String')] param( #The HTML text to parse. Accepts multiple separate documents as an array. This also accepts pipeline from Invoke-WebRequest [Parameter(ParameterSetName = 'String', Mandatory, ValueFromPipeline, ValueFromPipelineByPropertyName, Position = 0)] [String[]] $Content, #The URI or URIs from which to retrieve content. This may be faster than using Invoke-WebRequest but is less flexible in the method of retrieval (for instance, no POST) [Parameter(ParameterSetName = 'URI', Mandatory, ValueFromPipeline, ValueFromPipelineByPropertyName, Position = 0)] [System.URI[]] $URI, #Path to file or files containing HTML content to convert. This accepts pipeline from Get-Childitem or Get-Item [Parameter(ParameterSetName = 'Path', Mandatory, ValueFromPipeline, ValueFromPipelineByPropertyName, Position = 0)] [System.IO.FileInfo[]] $Path, #Do not return the Linq documentnode, instead return the HTMLDocument object. This is useful if you want to do XPath queries instead of Linq queries [switch] $Raw ) begin { $html = [HtmlAgilityPack.HtmlDocument]::new() $web = [HtmlAgilityPack.HtmlWeb]::new() } process { switch ($PSCmdlet.ParameterSetName) { 'String' { $Content | ForEach-Object { Write-Verbose "Loading HTML" $html.LoadHtml($_) if ($Raw) { $html } else { $html.DocumentNode } } } 'URI' { $URI | ForEach-Object { Write-Verbose "Loading URI $_" $site = $web.Load($_) if ($Raw) { $site } else { $site.DocumentNode } } } 'Path' { $Path | ForEach-Object { Write-Verbose "Loading File $_" $html.Load($_.FullName) if ($Raw) { $html } else { $html.DocumentNode } } } } } } |