feat: Get-MathML ( Fixes #2 )

Author: StartAutomating

Commands/Get-MathML.ps1

@@ -0,0 +1,95 @@
+function Get-MathML
+{
+    <#
+    .SYNOPSIS
+        Gets MathML 
+    .DESCRIPTION
+        Gets MathML from a file or page
+    .EXAMPLE
+        MathML https://dlmf.nist.gov/2.1
+    #>    
+    [Alias('MathML')]
+    param(
+    # A url or file path that hopefully contains MathML
+    # The response from this URL will be cached.
+    [Parameter(ValueFromPipelineByPropertyName)]
+    [Alias('Uri')]
+    [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 (-not $PSBoundParameters.Url) {
+            $mathMLValues = @($script:MathMLCache.Values.MathML)
+            if ($mathMLValues) {
+                foreach ($value in $mathMLValues) {
+                    if (-not $value) { continue }
+                    $value
+                }
+            } else {
+                
+            }   
+            return         
+        }
+        
+        if (-not $script:MathMLCache["$url"] -or $Force) {
+            $script:MathMLCache["$url"] = [Ordered]@{
+                Response =
+                    if ($url -as [xml]) {
+                        $url -as [xml]
+                    } elseif (Test-Path $url) {
+                        Get-Content -Raw $Url
+                    } elseif (-not $UseChromium) {                        
+                        Invoke-RestMethod $url                        
+                    } else {
+                        & $ChromiumPath --headless --dump-dom --disable-gpu --no-sandbox "$url" *>&1 |
+                            Where-Object { $_ -notmatch '^\[\d+:\d+' } |
+                            Out-String -Width 1mb
+                    }
+            }
+        }
+
+        if (
+            $script:MathMLCache["$url"].Response -and -not
+            $script:MathMLCache["$url"].MathML
+        ) {
+            $script:MathMLCache["$url"].MathML =
+                @(foreach ($match in $mathMlPattern.Matches("$(
+                    $script:MathMLCache["$url"].Response
+                )")) {
+                    $matchXml = $match.Value -as [xml]
+                    if ($matchXml) {
+                        $matchXml.pstypenames.insert(0, 'MathML')
+                    }
+                    $matchXml
+                })
+            
+        }
+
+        $script:MathMLCache["$url"].MathML                
+    }
+}
+