orphan endregion disables folding.

[ozu945]

System Details

• Operating system name and version: Win 7
• VS Code version: 1.25.1
• PowerShell extension version: 5.1.14409.1012
• Output from $PSVersionTable:
  Name Value

---

PSVersion 5.1.14409.1012
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.14409.1012
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1

Copy / paste the following commands into the PowerShell Integrated Console, and paste the output here:

code -v
1.25.1
1dfc5e557209371715f655691b1235b6b26a06be
x64

$pseditor.EditorServicesVersion
Major  Minor  Build  Revision
-----  -----  -----  --------
1      8      2      0

code --list-extensions --show-versions
alefragnani.numbered-bookmarks@0.11.1
chrmarti.regex@0.2.0
CoenraadS.bracket-pair-colorizer@1.0.59
DotJoshJohnson.xml@2.3.1
GrapeCity.gc-excelviewer@2.1.25
jasonlhy.hungry-delete@1.5.0
johnstoncode.svn-scm@1.31.0
jtr.vscode-position@1.0.1
ms-mssql.mssql@1.4.0
ms-python.python@2018.7.1
ms-vscode.csharp@1.15.2
ms-vscode.PowerShell@1.8.2
xyz.plsql-language@1.4.1

$PSVersionTable
Name                           Value
----                           -----
PSVersion                      5.1.14409.1012
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.14409.1012
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Issue Description

an orphan #endregion anywhere in the document will disable folding functionality. see exception below.

test case:

#endregion

begin {


}
process {

}

Attached Logs

[2018-08-01 14:35:48.703] [renderer1] [error] Cannot read property 'startIndex' of undefined: TypeError: Cannot read property 'startIndex' of undefined
	at LineNumberRange.fromTokenPair (C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:33:51)
	at tokens.forEach (C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:179:65)
	at Array.forEach (native)
	at FoldingProvider.matchScopeElements (C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:174:16)
	at FoldingProvider.extractFoldableRegions (C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:314:14)
	at FoldingProvider.<anonymous> (C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:129:42)
	at Generator.next (<anonymous>)
	at C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:10:71
	at Promise (<anonymous>)
	at __awaiter (C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:6:12)
	at FoldingProvider.provideFoldingRanges (C:\Users\<user>\.vscode\extensions\ms-vscode.powershell-1.8.2\out\src\features\Folding.js:104:16)
	at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:730:368
	at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:109:515
	at new n.Class.derive._oncancel (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:84:560)
	at Object.t.asWinJsPromise (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:109:478)
	at e.provideFoldingRanges (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:730:322)
	at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:740:322
	at e._withAdapter (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:731:534)
	at e.$provideFoldingRanges (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:740:284)
	at e._doInvokeHandler (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:658:87)
	at e._invokeHandler (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:657:779)
	at e._receiveRequest (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:656:851)
	at e._receiveOneMessage (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:656:620)
	at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:655:544
	at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:658:673
	at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:96:599
	at e.fire (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:97:917)
	at u (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:159:721)
	at Socket.<anonymous> (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:159:898)
	at emitOne (events.js:96:13)
	at Socket.emit (events.js:191:7)
	at readableAddChunk (_stream_readable.js:178:18)
	at Socket.Readable.push (_stream_readable.js:136:10)
	at Pipe.onread (net.js:560:20)

Follow the instructions in the README
about capturing and sending logs.

[TylerLeonhardt]

@glennsarti for awareness.

This is because of these lines of code:

https://github.com/PowerShell/vscode-powershell/blob/master/src/features/Folding.ts#L283-L288

The second if should probably be inside of the first if because we only want to consider the second "if" if we found what we were looking for in the first "if".

This is a trivial change if anyone wants the fame and fortune (ish) of contributing to you favorite extension 😊

[TylerLeonhardt]

Otherwise, we can take care of this as soon as we can.

[glennsarti]

Should there be tests for this?

[TylerLeonhardt]

Yeah definitely

[glennsarti]

PR is up with a test for it.