Handle powershell unexpected token with newline

ale_linters/powershell/powershell.vim

@@ -49,11 +49,19 @@ function! ale_linters#powershell#powershell#Handle(buffer, lines) abort
                 let l:matchcount = 1
             endif
 
-            let l:item = {
-            \   'lnum': str2nr(l:match[1]),
-            \   'col': str2nr(l:match[2]),
-            \   'type': 'E',
-            \}
+            " If the match is 0, it was a failed match
+            " probably due to an unexpected token which
+            " contained a newline. Reset matchcount. to
+            " continue to the next match
+            if !empty(l:match[1])
+                let l:item = {
+                \   'lnum': str2nr(l:match[1]),
+                \   'col': str2nr(l:match[2]),
+                \   'type': 'E',
+                \}
+            else
+                let l:matchcount = 0
+            endif
         elseif l:matchcount == 2
             " Second match[0] grabs the full line in order
             " to handles the text
@@ -84,8 +92,8 @@ endfunction
 
 call ale#linter#Define('powershell', {
 \   'name': 'powershell',
-\   'executable_callback': 'ale_linters#powershell#powershell#GetExecutable',
-\   'command_callback': 'ale_linters#powershell#powershell#GetCommand',
+\   'executable': function('ale_linters#powershell#powershell#GetExecutable'),
+\   'command': function('ale_linters#powershell#powershell#GetCommand'),
 \   'output_stream': 'stdout',
 \   'callback': 'ale_linters#powershell#powershell#Handle',
 \})

test/handler/test_powershell_handler.vader

@@ -60,3 +60,50 @@ Execute(The powershell handler should process multiple syntax errors from parsin
   \ '+ CategoryInfo          : NotSpecified: (:) [], ParseException',
   \ '+ FullyQualifiedErrorId : ParseException'
   \ ])
+Execute(The powershell handler should process unexecpected token that contains a newline character):
+  AssertEqual
+  \ [
+  \    {
+  \      'lnum': 2,
+  \      'col': 8,
+  \      'type': 'E',
+  \      'text': 'The string is missing the terminator: ".',
+  \      'code': 'ParseException'
+  \    },
+  \    {
+  \      'lnum': 2,
+  \      'col': 8,
+  \      'type': 'E',
+  \      'text': 'Unexpected token ''"',
+  \      'code': 'ParseException'
+  \    },
+  \    {
+  \      'lnum': 1,
+  \      'col': 1,
+  \      'type': 'E',
+  \      'text': 'Missing closing ''}'' in statement block or type definition.',
+  \      'code': 'ParseException'
+  \    }
+  \ ],
+  \ ale_linters#powershell#powershell#Handle(bufnr(''), [
+  \ 'At line:2 char:8',
+  \ '+     "" "',
+  \ '+        ~',
+  \ 'The string is missing the terminator: ".',
+  \ 'At line:2 char:8',
+  \ '+     "" "',
+  \ '+        ~',
+  \ 'Unexpected token ''"',
+  \ '',
+  \ '    }'' in expression or statement.',
+  \ '',
+  \ 'At line:1 char:1',
+  \ '+ {',
+  \ '+ ~',
+  \ 'Missing closing ''}'' in statement block or type definition.',
+  \ 'At C:\Users\jpharris\AppData\Local\Temp\VIAA777.tmp\script.ps1:1 char:150',
+  \ '+ ... ontents);   [void]$ExecutionContext.InvokeCommand.NewScriptBlock($Con ...',
+  \ '+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~',
+  \ '    + CategoryInfo          : NotSpecified: (:) [], ParseException',
+  \ '    + FullyQualifiedErrorId : ParseException'
+  \ ])