langchain : text_splitters Added PowerShell (#24582)

- **Description:** Added PowerShell support for text splitters language
include docs relevant update
  - **Issue:** None
  - **Dependencies:** None

---------

Co-authored-by: tzitman <tamir.zitman@intel.com>
Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/text-splitters/langchain_text_splitters/base.py

@@ -294,6 +294,7 @@ class Language(str, Enum):
     PERL = "perl"
     HASKELL = "haskell"
     ELIXIR = "elixir"
+    POWERSHELL = "powershell"
 
 
 @dataclass(frozen=True)

libs/text-splitters/langchain_text_splitters/character.py

@@ -659,6 +659,30 @@ class RecursiveCharacterTextSplitter(TextSplitter):
                 " ",
                 "",
             ]
+        elif language == Language.POWERSHELL:
+            return [
+                # Split along function definitions
+                "\nfunction ",
+                # Split along parameter declarations (escape parentheses)
+                "\nparam ",
+                # Split along control flow statements
+                "\nif ",
+                "\nforeach ",
+                "\nfor ",
+                "\nwhile ",
+                "\nswitch ",
+                # Split along class definitions (for PowerShell 5.0 and above)
+                "\nclass ",
+                # Split along try-catch-finally blocks
+                "\ntry ",
+                "\ncatch ",
+                "\nfinally ",
+                # Split by normal lines and empty spaces
+                "\n\n",
+                "\n",
+                " ",
+                "",
+            ]
         elif language in Language._value2member_map_:
             raise ValueError(f"Language {language} is not implemented yet!")
         else: