[REQ][PowerShell] Add additional reserved words list for parameter name in PowerShell (#8935)

* Add additional reserved words list for parameter name in PowerShell

Signed-off-by: SimeonGerginov <simeongerginov1@gmail.com>

* Add missing check for parameter name starting with number

Signed-off-by: SimeonGerginov <simeongerginov1@gmail.com>

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PowerShellClientCodegen.java

@@ -61,6 +61,7 @@ public class PowerShellClientCodegen extends DefaultCodegen implements CodegenCo
     protected String releaseNotes;
     protected String tags;
     protected String iconUri;
+    protected Set<String> paramNameReservedWords;
 
     /**
      * Constructs an instance of `PowerShellClientCodegen`.
@@ -452,6 +453,30 @@ public class PowerShellClientCodegen extends DefaultCodegen implements CodegenCo
                 "true"
         ));
 
+        paramNameReservedWords = new HashSet<String>(Arrays.asList(
+                "args",
+                "error",
+                "executioncontext",
+                "false",
+                "home",
+                "host",
+                "input",
+                "myinvocation",
+                "nestedpromptlevel",
+                "null",
+                "pid",
+                "profile",
+                "pscommandpath",
+                "psculture",
+                "pshome",
+                "psscriptroot",
+                "psuiculture",
+                "psversiontable",
+                "shellid",
+                "stacktrace",
+                "true"
+        ));
+
         defaultIncludes = new HashSet<String>(Arrays.asList(
                 "Byte",
                 "SByte",
@@ -937,7 +962,17 @@ public class PowerShellClientCodegen extends DefaultCodegen implements CodegenCo
 
     @Override
     public String toParamName(String name) {
-        return toVarName(name);
+        // sanitize and camelize parameter name
+        // pet_id => PetId
+        name = camelize(sanitizeName(name));
+
+        // for param name reserved word or word starting with number, append _
+        if (paramNameReservedWords.contains(name) || name.matches("^\\d.*")) {
+            LOGGER.warn(name + " (reserved word or special variable name) cannot be used in naming. Renamed to " + escapeReservedWord(name));
+            name = escapeReservedWord(name);
+        }
+
+        return name;
     }
 
     @Override