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B �5�g� � @ s� d Z ddlmZ ddlmZ ddlmZ ddlZddlZddl m Z m Z dZ ddd �d d �Z d d d �dd�Zddd �dd�Zdddd d�dd�Zddd�dd�ZdS ) z6 :func:`~pandas.eval` source string parsing functions � )� annotations)�StringIO)� iskeywordN)�Hashable�Iterator�d �str)�name�returnc s~ | � � rt| �s| S dd� tj�� D �� � �ddddddd d �� d �� fd d �| D ��} d| } | � � sztd| � d���| S )a= Create valid Python identifiers from any string. Check if name contains any special characters. If it contains any special characters, the special characters will be replaced by a special string and a prefix is added. Raises ------ SyntaxError If the returned name is not a Python valid identifier, raise an exception. This can happen if there is a hashtag in the name, as the tokenizer will than terminate and not find the backtick. But also for characters that fall out of the range of (U+0001..U+007F). c S s$ i | ] \}}d t j| � d �|�qS )�_)�token�tok_name)�.0�char�tokval� r �U/home/digitalm-up/venv/lib/python3.7/site-packages/pandas/core/computation/parsing.py� <dictcomp>) s z2create_valid_python_identifier.<locals>.<dictcomp>r Z_QUESTIONMARK_Z_EXCLAMATIONMARK_Z _DOLLARSIGN_Z _EUROSIGN_Z _SINGLEQUOTE_Z _DOUBLEQUOTE_)� �?�!�$u €�'�"� c 3 s | ]}� � ||�V qd S )N)�get)r r )� special_characters_replacementsr r � <genexpr>< s z1create_valid_python_identifier.<locals>.<genexpr>ZBACKTICK_QUOTED_STRING_zCould not convert 'z ' to a valid Python identifier.)� isidentifierr �tokenize�EXACT_TOKEN_TYPES�items�update�join� SyntaxError)r r )r r � create_valid_python_identifier s" r% ztuple[int, str])�tokr c C s& | \}}|t kr tjt|�fS ||fS )a[ Clean up a column name if surrounded by backticks. Backtick quoted string are indicated by a certain tokval value. If a string is a backtick quoted token it will processed by :func:`_create_valid_python_identifier` so that the parser can find this string when the query is executed. In this case the tok will get the NAME tokval. Parameters ---------- tok : tuple of int, str ints correspond to the all caps constants in the tokenize module Returns ------- tok : Tuple[int, str] Either the input or token or the replacement values )�BACKTICK_QUOTED_STRINGr �NAMEr% )r& �toknumr r r r �clean_backtick_quoted_toksE s r* r c C s> y$t d| � d��}t|�d }t|�S tk r8 | S X dS )a� Function to emulate the cleaning of a backtick quoted name. The purpose for this function is to see what happens to the name of identifier if it goes to the process of being parsed a Python code inside a backtick quoted string and than being cleaned (removed of any special characters). Parameters ---------- name : hashable Name to be cleaned. Returns ------- name : hashable Returns the name after tokenizing and cleaning. Notes ----- For some cases, a name cannot be converted to a valid Python identifier. In that case :func:`tokenize_string` raises a SyntaxError. In that case, we just return the name unmodified. If this name was used in the query string (this makes the query call impossible) an error will be raised by :func:`tokenize_backtick_quoted_string` instead, which is not caught and propagates to the user level. �`� N)�tokenize_string�nextr% r$ )r Z tokenizedr r r r �clean_column_name_ s r/ z Iterator[tokenize.TokenInfo]�int)�token_generator�source� string_startr c C s: x(| D ] \}}}}}|dkr|d }P qW t |||� fS )a� Creates a token from a backtick quoted string. Moves the token_generator forwards till right after the next backtick. Parameters ---------- token_generator : Iterator[tokenize.TokenInfo] The generator that yields the tokens of the source string (Tuple[int, str]). The generator is at the first token after the backtick (`) source : str The Python source code string. string_start : int This is the start of backtick quoted string inside the source string. Returns ------- tok: Tuple[int, str] The token that represents the backtick quoted string. The integer is equal to BACKTICK_QUOTED_STRING (100). r+ r, )r' )r1 r2 r3 r r �start� string_endr r r � tokenize_backtick_quoted_string� s r6 zIterator[tuple[int, str]])r2 r c c s� t | �j}t�|�}x||D ]t\}}}}}|dkr�y t|| |d d d�V W q� tk r� } ztd| � d��|�W dd}~X Y q�X q||fV qW dS )a$ Tokenize a Python source code string. Parameters ---------- source : str The Python source code string. Returns ------- tok_generator : Iterator[Tuple[int, str]] An iterator yielding all tokens with only toknum and tokval (Tuple[ing, str]). r+ r, )r3 z Failed to parse backticks in 'z'.N)r �readliner �generate_tokensr6 � Exceptionr$ )r2 Z line_readerr1 r) r r4 r �errr r r r- � s &r- )�__doc__� __future__r �ior �keywordr r r �typingr r r' r% r* r/ r6 r- r r r r �<module> s 2%"
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