
    9|hN                     R    d dl Z d dlmZmZmZmZ d dlmZ d dlm	Z	  G d de	      Z
y)    N)AnyCallableOptionalUnion)parse_json_markdown)StringEvaluatorc                        e Zd ZdZ	 	 ddeeeegef      deeegef      deddf fdZ	e
defd       Ze
defd	       Ze
defd
       Zdedeeedeeeef   fdZ	 	 ddedee   dee   dedef
dZ xZS )JsonEditDistanceEvaluatora  
    An evaluator that calculates the edit distance between JSON strings.

    This evaluator computes a normalized Damerau-Levenshtein distance between two JSON strings
    after parsing them and converting them to a canonical format (i.e., whitespace and key order are normalized).
    It can be customized with alternative distance and canonicalization functions.

    Args:
        string_distance (Optional[Callable[[str, str], float]]): A callable that computes the distance between two strings.
            If not provided, a Damerau-Levenshtein distance from the `rapidfuzz` package will be used.
        canonicalize (Optional[Callable[[Any], Any]]): A callable that converts a parsed JSON object into its canonical string form.
            If not provided, the default behavior is to serialize the JSON with sorted keys and no extra whitespace.
        **kwargs (Any): Additional keyword arguments.

    Attributes:
        _string_distance (Callable[[str, str], float]): The internal distance computation function.
        _canonicalize (Callable[[Any], Any]): The internal canonicalization function.

    Examples:
        >>> evaluator = JsonEditDistanceEvaluator()
        >>> result = evaluator.evaluate_strings(prediction='{"a": 1, "b": 2}', reference='{"a": 1, "b": 3}')
        >>> assert result["score"] is not None

    Raises:
        ImportError: If `rapidfuzz` is not installed and no alternative `string_distance` function is provided.

    Nstring_distancecanonicalizekwargsreturnc                     t         |           ||| _        n"	 ddlm} |j                  j                  | _        ||| _        y d | _        y # t
        $ r t        d      w xY w)Nr   )distancezThe default string_distance operator for the  JsonEditDistanceEvaluator requires installation of the rapidfuzz package. Please install it with `pip install rapidfuzz`.c                 2    t        j                  | dd      S )N),:T)
separators	sort_keys)jsondumps)xs    i/var/www/html/test/engine/venv/lib/python3.12/site-packages/langchain/evaluation/parsing/json_distance.py<lambda>z4JsonEditDistanceEvaluator.__init__.<locals>.<lambda>=   s    4::%,     )	super__init___string_distance	rapidfuzzr   ImportErrorDamerauLevenshteinnormalized_distance_canonicalize)selfr   r   r   rfd	__class__s        r   r   z"JsonEditDistanceEvaluator.__init__&   sx     	&$3D!5 %($:$:$N$ND!#!-D"D  !F s   A A$c                      y)NF r$   s    r   requires_inputz(JsonEditDistanceEvaluator.requires_inputC   s    r   c                      y)NTr(   r)   s    r   requires_referencez,JsonEditDistanceEvaluator.requires_referenceG   s    r   c                      y)Njson_edit_distancer(   r)   s    r   evaluation_namez)JsonEditDistanceEvaluator.evaluation_nameK   s    #r   nodec                 <    t        |t              rt        |      S |S )N)
isinstancestrr   )r$   r0   s     r   _parse_jsonz%JsonEditDistanceEvaluator._parse_jsonO   s    dC &t,,r   
predictioninput	referencec                     | j                  | j                  |            }| j                  | j                  |            }| j                  ||      }d|iS )Nscore)r#   r4   r   )r$   r5   r6   r7   r   parsedlabelr   s           r   _evaluate_stringsz+JsonEditDistanceEvaluator._evaluate_stringsT   sW     ##D$4$4Z$@A""4#3#3I#>?((7""r   )NN)__name__
__module____qualname____doc__r   r   r3   floatr   r   propertyboolr*   r,   r/   r   dictlistintr4   r<   __classcell__)r&   s   @r   r
   r
   	   s   < BF7;!(C:u+<"=> xs
34 	
 
:    D   $ $ $ dD$tSRU.U(V   $#'	
#
# }
# C=	
#
 
# 

#r   r
   )r   typingr   r   r   r   langchain_core.utils.jsonr   langchain.evaluation.schemar   r
   r(   r   r   <module>rK      s"     1 1 9 7U# U#r   