Improve validation function

Signed-off-by: David Weik <geekupyourlife@gmail.com>

Author: Criptic

js/utility/validate-ds2-variable-name.js

@@ -6,35 +6,41 @@
  * @returns {Boolean} - True if a valid name, False if an invalid name
  */
 function isValidDS2VariableName(name) {
-    // Check the general pattern: starts with a letter or underscore, followed by letters, digits, or underscores
-    const identifierPattern = /^[A-Za-z_][A-Za-z0-9_]*$/;
-    if (!identifierPattern.test(name)) {
-        return false;
-    }
+  // Check length constraint
+  if (typeof name !== "string" || name.length < 1 || name.length > 32) {
+    return false;
+  }
 
-    // Check the length of the pattern
-    if (name.length > 255) {
-        return false;
-    }
+  // Reject if starts with more than one underscore
+  if (/^__/.test(name)) {
+    return false;
+  }
 
-  // Reserved keywords (converted to lowercase for case-insensitive check)
-    const reservedKeywords = new Set([
-        "___kplist", "_all_", "_hostname_", "_new_", "_localnthreads_", "_localthreadid_", "_nthreads_",
-        "_null_", "_rc_", "_rowset_", "_temporary_", "_threadid_", "abort", "and", "as", "asm",
-        "bigint", "binary", "by", "call", "catalog", "char", "character", "commit", "continue",
-        "data", "date", "dcl", "decimal", "declare", "delete", "descending", "dim", "do", "double",
-        "drop", "ds2_options", "elif", "else", "end", "enddata", "endmodule", "endpackage",
-        "endstage", "endtable", "endthread", "eq", "error", "escape", "float", "format", "fortran",
-        "forward", "from", "function", "ge", "global", "goto", "group", "gt", "having", "identity",
-        "if", "in", "indsname", "indsnum", "informat", "inline", "input", "int", "integer", "in_out",
-        "keep", "label", "le", "leave", "like", "list", "lt", "merge", "method", "missing", "modify",
-        "module", "national", "nchar", "ne", "ng", "nl", "not", "null", "numeric", "nvarchar", "ods",
-        "of", "or", "order", "other", "otherwise", "output", "overwrite", "package", "partition",
-        "precision", "private", "program", "put", "real", "remove", "rename", "replace", "require",
-        "retain", "return", "returns", "rollback", "select", "set", "smallint", "sqlsub", "stage",
-        "stop", "stored", "substr", "system", "table", "then", "this", "thread", "threads", "time",
-        "timestamp", "tinyint", "to", "transaction", "t_udf", "tspl_options", "until", "update",
-        "vararray", "varbinary", "varchar", "varlist", "varying", "when", "where", "while"
-    ]);
-    return !reservedKeywords.has(name.toLowerCase());
+  // General identifier pattern: starts with letter or underscore, followed by letters, digits, or underscores
+  const identifierPattern = /^[A-Za-z_][A-Za-z0-9_]*$/;
+  if (!identifierPattern.test(name)) {
+    return false;
+  }
+
+  // Reserved keywords (lowercased for case-insensitive comparison)
+  const reservedKeywords = new Set([
+    "___kplist", "_all_", "_hostname_", "_new_", "_localnthreads_", "_localthreadid_", "_nthreads_",
+    "_null_", "_rc_", "_rowset_", "_temporary_", "_threadid_", "abort", "and", "as", "asm",
+    "bigint", "binary", "by", "call", "catalog", "char", "character", "commit", "continue",
+    "data", "date", "dcl", "decimal", "declare", "delete", "descending", "dim", "do", "double",
+    "drop", "ds2_options", "elif", "else", "end", "enddata", "endmodule", "endpackage",
+    "endstage", "endtable", "endthread", "eq", "error", "escape", "float", "format", "fortran",
+    "forward", "from", "function", "ge", "global", "goto", "group", "gt", "having", "identity",
+    "if", "in", "indsname", "indsnum", "informat", "inline", "input", "int", "integer", "in_out",
+    "keep", "label", "le", "leave", "like", "list", "lt", "merge", "method", "missing", "modify",
+    "module", "national", "nchar", "ne", "ng", "nl", "not", "null", "numeric", "nvarchar", "ods",
+    "of", "or", "order", "other", "otherwise", "output", "overwrite", "package", "partition",
+    "precision", "private", "program", "put", "real", "remove", "rename", "replace", "require",
+    "retain", "return", "returns", "rollback", "select", "set", "smallint", "sqlsub", "stage",
+    "stop", "stored", "substr", "system", "table", "then", "this", "thread", "threads", "time",
+    "timestamp", "tinyint", "to", "transaction", "t_udf", "tspl_options", "until", "update",
+    "vararray", "varbinary", "varchar", "varlist", "varying", "when", "where", "while"
+  ]);
+
+  return !reservedKeywords.has(name.toLowerCase());
 }