Commands/Get-MathML.ps1
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function Get-MathML { <# .SYNOPSIS Gets MathML .DESCRIPTION Gets MathML from a file or page .EXAMPLE MathML https://dlmf.nist.gov/2.1 .EXAMPLE MathML 'https://en.wikipedia.org/wiki/Rose_(mathematics)' .EXAMPLE MathML "<math xmlns='http://www.w3.org/1998/Math/MathML'> <semantics> <mrow> <mn>1</mn> <mo>+</mo> <mn>1</mn> <mo>=</mo> <mn>2</mn> </mrow> </semantics> </math>" #> [Alias('MathML')] param( # A url or file path that hopefully contains MathML # The response from this URL will be cached. [Parameter(ValueFromPipelineByPropertyName)] [Alias('Uri','FilePath','Fullname')] [string] $Url, # If set, will request the URL, even if it has been cached. [Parameter(ValueFromPipelineByPropertyName)] [switch] $Force, # If set, will use chromium to request the page, and will [Parameter(ValueFromPipelineByPropertyName)] [switch] $UseChromium, # The path to a chromium browser. [Parameter(ValueFromPipelineByPropertyName)] [string] $ChromiumPath = 'chromium' ) begin { if (-not $script:MathMLCache) { $script:MathMLCache = [Ordered]@{} } $mathMlPattern = [Regex]::new('<math[\s\S]+?</math>','IgnoreCase') } process { # If we have no URL if (-not $PSBoundParameters.Url) { # get any loaded MathML $mathMLValues = @($script:MathMLCache.Values.MathML) if ($mathMLValues) { # unroll each result foreach ($value in $mathMLValues) { if (-not $value) { continue } # and return non-null values $value } } return } # If we have not yet cached this URL, or we are using the `-Force` if (-not $script:MathMLCache["$url"] -or $Force) { # Create a cache object $script:MathMLCache["$url"] = [Ordered]@{ Response = # If the URL could be XML if ($url -as [xml]) { # use that as the source. ($url -as [xml]).OuterXml } # If the URL was actually a file path elseif (Test-Path $url) { # get it's content. Get-Content -Raw $Url } # If we are not using chromium, elseif (-not $UseChromium) { # use Invoke-RestMethod to get the URL Invoke-RestMethod $url } # If we are using chromium else { # Call chromium in headless mode and dump DOM & $ChromiumPath --headless --disable-gpu --no-sandbox --dump-dom "$url" *>&1 | # strip out any chromium trace messages Where-Object { $_ -notmatch '^\[\d+:\d+' } | # and stringify the whole response. Out-String -Width 1mb } } } # If we have a response for this URL, but no MathML yet if ( $script:MathMLCache["$url"].Response -and -not $script:MathMLCache["$url"].MathML ) { $script:MathMLCache["$url"].MathML = # find any matches for our pattern @(foreach ($match in $mathMlPattern.Matches("$( $script:MathMLCache["$url"].Response )")) { # and cast them into XML. $matchXml = $match.Value -as [xml] if (-not $matchXML) { continue } # If they do not have the xml namespace if (-not $matchXML.math.xmlns) { # add it $matchXML.math.setAttribute('xmlns', 'http://www.w3.org/1998/Math/MathML') } # decorate the return as MathML $matchXml.pstypenames.insert(0, 'MathML') # and output it to the cache $matchXml }) } # Last but not least, output any MathML objects in the cache for this URL. $script:MathMLCache["$url"].MathML } } |