René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Backtick escaping inconsistent","articleBody":"Was investigating escaping a filename for PowerShell in https://github.com/PowerShell/PowerShellEditorServices/pull/765#discussion_r224297544.\r\n\r\nI created a directory with the following files:\r\n```\r\nMode                LastWriteTime         Length Name\r\n----                -------------         ------ ----\r\n-a----       10/11/2018  10:57 AM              9 [script.ps1\r\n-a----       10/11/2018  10:57 AM              1 `[script.ps1\r\n-a----       10/11/2018  10:57 AM              1 ``[script.ps1\r\n-a----       10/11/2018  10:57 AM              1 ```[script.ps1\r\n-a----       10/11/2018  10:57 AM              1 ````[script.ps1\r\n-a----       10/11/2018  10:57 AM              8 script.ps1\r\n```\r\n\r\n(`New-Item` doesn't seem to have a `LiteralPath` parameter by the way)\r\n\r\nI then run the following:\r\n```powershell\r\nforeach ($i in 0..12) { $ticks = '`' * $i; Get-Item \"./$ticks[script.ps1\" }\r\n```\r\n\r\n## Actual Results\r\n\r\nThe output of this in the given directory gives me:\r\n```\r\nGet-Item : Cannot retrieve the dynamic parameters for the cmdlet. The specified wildcard character pattern is not valid: [script.ps1\r\nAt line:1 char:44\r\n+ ... h ($i in 0..12) { $ticks = '`' * $i; Get-Item \"./$ticks[script.ps1\" }\r\n+                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n+ CategoryInfo          : InvalidArgument: (:) [Get-Item], ParameterBindingException\r\n+ FullyQualifiedErrorId : GetDynamicParametersException,Microsoft.PowerShell.Commands.GetItemCommand\r\n\r\n\r\n\r\n    Directory: C:\\Users\\roholt\\Documents\\Dev\\sandbox\\badnames\r\n\r\n\r\nMode                LastWriteTime         Length Name\r\n----                -------------         ------ ----\r\n-a----       10/11/2018  10:57 AM              9 [script.ps1\r\n-a----       10/11/2018  10:57 AM              9 [script.ps1\r\n-a----       10/11/2018  10:57 AM              1 `[script.ps1\r\nGet-Item : Cannot retrieve the dynamic parameters for the cmdlet. The specified wildcard character pattern is not valid: ``[script.ps1\r\nAt line:1 char:44\r\n+ ... h ($i in 0..12) { $ticks = '`' * $i; Get-Item \"./$ticks[script.ps1\" }\r\n+                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n+ CategoryInfo          : InvalidArgument: (:) [Get-Item], ParameterBindingException\r\n+ FullyQualifiedErrorId : GetDynamicParametersException,Microsoft.PowerShell.Commands.GetItemCommand\r\n\r\n-a----       10/11/2018  10:57 AM              1 ``[script.ps1\r\n-a----       10/11/2018  10:57 AM              1 `[script.ps1\r\n-a----       10/11/2018  10:57 AM              1 ```[script.ps1\r\nGet-Item : Cannot retrieve the dynamic parameters for the cmdlet. The specified wildcard character pattern is not valid: ````[script.ps1\r\nAt line:1 char:44\r\n+ ... h ($i in 0..12) { $ticks = '`' * $i; Get-Item \"./$ticks[script.ps1\" }\r\n+                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n+ CategoryInfo          : InvalidArgument: (:) [Get-Item], ParameterBindingException\r\n+ FullyQualifiedErrorId : GetDynamicParametersException,Microsoft.PowerShell.Commands.GetItemCommand\r\n\r\n-a----       10/11/2018  10:57 AM              1 ````[script.ps1\r\n-a----       10/11/2018  10:57 AM              1 ``[script.ps1\r\nGet-Item : Cannot find path 'C:\\Users\\roholt\\Documents\\Dev\\sandbox\\badnames\\`````[script.ps1' because it does not exist.\r\nAt line:1 char:44\r\n+ ... h ($i in 0..12) { $ticks = '`' * $i; Get-Item \"./$ticks[script.ps1\" }\r\n+                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n+ CategoryInfo          : ObjectNotFound: (C:\\Users\\roholt...````[script.ps1:String) [Get-Item], ItemNotFoundException\r\n+ FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetItemCommand\r\n\r\nGet-Item : Cannot retrieve the dynamic parameters for the cmdlet. The specified wildcard character pattern is not valid: ``````[script.ps1\r\nAt line:1 char:44\r\n+ ... h ($i in 0..12) { $ticks = '`' * $i; Get-Item \"./$ticks[script.ps1\" }\r\n+                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n+ CategoryInfo          : InvalidArgument: (:) [Get-Item], ParameterBindingException\r\n+ FullyQualifiedErrorId : GetDynamicParametersException,Microsoft.PowerShell.Commands.GetItemCommand\r\n```\r\n\r\nMore concretely:\r\n\r\n```\r\n\u003e Get-Item './[script.ps1'  # 0\r\n# Error (The specified wildcard character pattern is not valid: [script.ps1)\r\n\u003e Get-Item './`[script.ps1'  # 1\r\n# Finds '[script.ps1'\r\n\u003e Get-Item './``[script.ps1'  # 2\r\n# Finds '[script.ps1'                         \u003c--- ???\r\n\u003e Get-Item './```[script.ps1'  # 3\r\n# Finds '`[script.ps1'\r\n\u003e Get-Item './````[script.ps1'  # 4\r\n# Error (The specified wildcard character pattern is not valid: ``[script.ps1)\r\n\u003e Get-Item './`````[script.ps1'  # 5\r\n# Finds '``[script.ps1'\r\n\u003e Get-Item './``````[script.ps1'  # 6\r\n# Finds '`[script.ps1'                         \u003c--- ???\r\n\u003e Get-Item './```````[script.ps1'  # 7\r\n# Finds '```[script.ps1'\r\n\u003e Get-Item './````````[script.ps1'  # 8\r\n# Error (The specified wildcard character pattern is not valid: ````[script.ps1)\r\n\u003e Get-Item './`````````[script.ps1'  # 9\r\n# Finds '````[script.ps1'\r\n\u003e Get-Item './``````````[script.ps1'  # 10\r\n# Finds '``[script.ps1'                         \u003c--- ???\r\n\u003e Get-Item './```````````[script.ps1'  # 11\r\n# Error (Cannot find path 'C:\\Users\\roholt\\Documents\\Dev\\sandbox\\badnames\\`````[script.ps1' because it does not exist.)\r\n\u003e Get-Item './````````````[script.ps1'  # 12\r\n# Error (The specified wildcard character pattern is not valid: ``````[script.ps1)\r\n```\r\n\r\nCases 0, 1, 3, 4, 5, 7, 8, 9, 11 and 12 make sense. Cases 2, 6 and 10 seem pretty strange to me.\r\n\r\n## Expected Behaviour\r\n\r\nCases 2, 6 and 10 should report an invalid wildcard pattern, like cases 0, 4, 8 and 12.\r\n\r\nTagging @JamesWTruher because we discussed this offline earlier.","author":{"url":"https://github.com/rjmholt","@type":"Person","name":"rjmholt"},"datePublished":"2018-10-11T18:19:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/7999/PowerShell/issues/7999"}