Allow nls before pipe operator

Author: En3Tho

src/main/resources/PowerShell.bnf

@@ -381,7 +381,7 @@ cast_expression ::= type_literal_expression unary_expression
 
 //private attributed_expression ::= type_literal variable
 
-left pipeline_tail ::= ( PIPE nls? command_call_expression )+
+left pipeline_tail ::= ( nls? PIPE nls? command_call_expression )+
 {elementType=pipeline}
 
 command_call_expression ::= command_invocation_operator ( (command_module command_name_expr command_element* ) | command_name_expr command_element* ) | command_name_expression command_element*

src/test/kotlin/com/intellij/plugin/powershell/lang/PowerShellParserTest.kt

@@ -40,4 +40,5 @@ class PowerShellParserTest : ParsingTestCase("parser", "ps1", PowerShellParserDe
   fun testEnumDeclaration() { doTest(true) }
   fun testParamBlock() { doTest(true) }
   fun testComment() { doTest(true) }
+  fun testNewLineThenPipeOperator() { doTest(true) }
 }

src/test/resources/testData/parser/NewLineThenPipeOperator.ps1

@@ -0,0 +1,6 @@
+1, 2, 3
+| Foreach-Object { $_ }
+
+1, 2, 3
+
+| Foreach-Object { $_ }

src/test/resources/testData/parser/NewLineThenPipeOperator.txt

@@ -0,0 +1,64 @@
+FILE(0,65)
+  PowerShellPipelineTailImplGen(PIPELINE)(0,31)
+    PowerShellArrayLiteralExpressionImplGen(ARRAY_LITERAL_EXPRESSION)(0,7)
+      PowerShellIntegerLiteralExpressionImplGen(INTEGER_LITERAL_EXPRESSION)(0,1)
+        PsiElement(DEC_INTEGER)('1')(0,1)
+      PsiElement(,)(',')(1,2)
+      PsiWhiteSpace(' ')(2,3)
+      PowerShellIntegerLiteralExpressionImplGen(INTEGER_LITERAL_EXPRESSION)(3,4)
+        PsiElement(DEC_INTEGER)('2')(3,4)
+      PsiElement(,)(',')(4,5)
+      PsiWhiteSpace(' ')(5,6)
+      PowerShellIntegerLiteralExpressionImplGen(INTEGER_LITERAL_EXPRESSION)(6,7)
+        PsiElement(DEC_INTEGER)('3')(6,7)
+    PsiElement(NLS)('\n')(7,8)
+    PsiElement(|)('|')(8,9)
+    PsiWhiteSpace(' ')(9,10)
+    PowerShellCommandCallExpressionImplGen(COMMAND_CALL_EXPRESSION)(10,31)
+      PowerShellCommandNameImplGen(COMMAND_NAME)(10,24)
+        PowerShellIdentifierImplGen(IDENTIFIER)(10,24)
+          PsiElement(GENERIC_ID_PART)('Foreach-Object')(10,24)
+      PsiWhiteSpace(' ')(24,25)
+      PowerShellCommandArgumentImplGen(COMMAND_ARGUMENT)(25,31)
+        PowerShellScriptBlockExpressionImplGen(SCRIPT_BLOCK_EXPRESSION)(25,31)
+          PsiElement({)('{')(25,26)
+          PsiWhiteSpace(' ')(26,27)
+          PowerShellBlockBodyImplGen(BLOCK_BODY)(27,29)
+            PowerShellTargetVariableExpressionImplGen(TARGET_VARIABLE_EXPRESSION)(27,29)
+              PsiElement($)('$')(27,28)
+              PowerShellIdentifierImplGen(IDENTIFIER)(28,29)
+                PsiElement(SIMPLE_ID)('_')(28,29)
+          PsiWhiteSpace(' ')(29,30)
+          PsiElement(})('}')(30,31)
+  PsiElement(NLS)('\n\n')(31,33)
+  PowerShellPipelineTailImplGen(PIPELINE)(33,65)
+    PowerShellArrayLiteralExpressionImplGen(ARRAY_LITERAL_EXPRESSION)(33,40)
+      PowerShellIntegerLiteralExpressionImplGen(INTEGER_LITERAL_EXPRESSION)(33,34)
+        PsiElement(DEC_INTEGER)('1')(33,34)
+      PsiElement(,)(',')(34,35)
+      PsiWhiteSpace(' ')(35,36)
+      PowerShellIntegerLiteralExpressionImplGen(INTEGER_LITERAL_EXPRESSION)(36,37)
+        PsiElement(DEC_INTEGER)('2')(36,37)
+      PsiElement(,)(',')(37,38)
+      PsiWhiteSpace(' ')(38,39)
+      PowerShellIntegerLiteralExpressionImplGen(INTEGER_LITERAL_EXPRESSION)(39,40)
+        PsiElement(DEC_INTEGER)('3')(39,40)
+    PsiElement(NLS)('\n\n')(40,42)
+    PsiElement(|)('|')(42,43)
+    PsiWhiteSpace(' ')(43,44)
+    PowerShellCommandCallExpressionImplGen(COMMAND_CALL_EXPRESSION)(44,65)
+      PowerShellCommandNameImplGen(COMMAND_NAME)(44,58)
+        PowerShellIdentifierImplGen(IDENTIFIER)(44,58)
+          PsiElement(GENERIC_ID_PART)('Foreach-Object')(44,58)
+      PsiWhiteSpace(' ')(58,59)
+      PowerShellCommandArgumentImplGen(COMMAND_ARGUMENT)(59,65)
+        PowerShellScriptBlockExpressionImplGen(SCRIPT_BLOCK_EXPRESSION)(59,65)
+          PsiElement({)('{')(59,60)
+          PsiWhiteSpace(' ')(60,61)
+          PowerShellBlockBodyImplGen(BLOCK_BODY)(61,63)
+            PowerShellTargetVariableExpressionImplGen(TARGET_VARIABLE_EXPRESSION)(61,63)
+              PsiElement($)('$')(61,62)
+              PowerShellIdentifierImplGen(IDENTIFIER)(62,63)
+                PsiElement(SIMPLE_ID)('_')(62,63)
+          PsiWhiteSpace(' ')(63,64)
+          PsiElement(})('}')(64,65)