a
    oÝEb9  ã                	   @  s  d Z ddlmZ ddlmZ ddlmZ ddlZddlZddlZ	ddl
mZmZ ddlmZ ddlZddlmZ dd	lmZ d
ZdZdZdZg d¢ZdZdZdZdZde› de› de› de› d�	Zde› de› d�ZdZ dddœdd„Z!ddœdd „Z"d!d"„ Z#d#d$„ Z$G d%d&„ d&eej%ƒZ&dS )'a-  
Read a SAS XPort format file into a Pandas DataFrame.

Based on code from Jack Cushman (github.com/jcushman/xport).

The file format is defined here:

https://support.sas.com/content/dam/SAS/support/en/technical-papers/record-layout-of-a-sas-version-5-or-6-data-set-in-sas-transport-xport-format.pdf
é    )Úannotations)Úabc)ÚdatetimeN)ÚFilePathÚ
ReadBuffer)ÚAppender)Ú
get_handle)Ú
ReaderBasezPHEADER RECORD*******LIBRARY HEADER RECORD!!!!!!!000000000000000000000000000000  zKHEADER RECORD*******MEMBER  HEADER RECORD!!!!!!!000000000000000001600000000zPHEADER RECORD*******DSCRPTR HEADER RECORD!!!!!!!000000000000000000000000000000  zPHEADER RECORD*******OBS     HEADER RECORD!!!!!!!000000000000000000000000000000  )ÚntypeZnhfunÚfield_lengthZnvar0ÚnameÚlabelZnformZnflZnum_decimalsZnfjZnfillZniformZniflZnifdZnposÚ_z‚Parameters
----------
filepath_or_buffer : str or file-like object
    Path to SAS file or object implementing binary read method.zâindex : identifier of index column
    Identifier of column that should be used as index of the DataFrame.
encoding : str
    Encoding for text data.
chunksize : int
    Read file `chunksize` lines at a time, returns iterator.zBformat : str
    File format, only `xport` is currently supported.z\iterator : bool, default False
    Return XportReader object for reading file incrementally.z#Read a SAS file into a DataFrame.

Ú
a  

Returns
-------
DataFrame or XportReader

Examples
--------
Read a SAS Xport file:

>>> df = pd.read_sas('filename.XPT')

Read a Xport file in 10,000 line chunks:

>>> itr = pd.read_sas('filename.XPT', chunksize=10000)
>>> for chunk in itr:
>>>     do_something(chunk)

z$Class for reading SAS Xport files.

zš

Attributes
----------
member_info : list
    Contains information about the file
fields : list
    Contains information about the variables in the file
zÊRead observations from SAS Xport file, returning as data frame.

Parameters
----------
nrows : int
    Number of rows to read from data file; if None, read whole
    file.

Returns
-------
A DataFrame.
Ústrr   )ÚdatestrÚreturnc                 C  s,   zt  | d¡W S  ty&   tj Y S 0 dS )z1Given a date in xport format, return Python date.z%d%b%y:%H:%M:%SN)r   ÚstrptimeÚ
ValueErrorÚpdZNaT)r   © r   úW/home/ja/django-apps/lartica_env/lib/python3.9/site-packages/pandas/io/sas/sas_xport.pyÚ_parse_dateŽ   s    r   )Úsc                 C  s@   i }d}|D ](\}}| ||| …   ¡ ||< ||7 }q|d= |S )a  
    Parameters
    ----------
    s: str
        Fixed-length string to split
    parts: list of (name, length) pairs
        Used to break up string, name '_' will be filtered from output.

    Returns
    -------
    Dict of name:contents of string at given location.
    r   r   )Ústrip)r   ÚpartsÚoutÚstartr   Úlengthr   r   r   Ú_split_line—   s    
r   c                 C  sT   |dkrPt  t| ƒt  d¡¡}t  d|› dd| › �¡}|j|d�}| |d< |S | S )Né   ZS8ÚSz,S©ÚdtypeÚf0)ÚnpÚzerosÚlenr#   Úview)ÚvecÚnbytesÚvec1r#   Zvec2r   r   r   Ú_handle_truncated_float_vec­   s    	r,   c           	      C  s  t  d¡}| j|d�}|d }|d }|d@ }t jt| ƒt jd�}d|t  |d@ ¡< d|t  |d	@ ¡< d
|t  |d@ ¡< ||L }||? |d@ dd
|  > B }|dM }||d? d@ d d> | d d> |d@ B O }t jt|ƒfdd�}||d< ||d< |jdd�}| d¡}|S )zf
    Parse a vector of float values representing IBM 8 byte floats into
    native 8 byte floats.
    z>u4,>u4r"   r$   Úf1iÿÿÿ é   i    é   i  @ é   i  € é   é   l   ÿß é   é   éA   iÿ  é   l        z>f8Zf8)	r%   r#   r(   r&   r'   Zuint8ÚwhereÚemptyZastype)	r)   r#   r+   Zxport1Zxport2Zieee1ÚshiftZieee2Zieeer   r   r   Ú_parse_float_vecÀ   s*    
		 ÿ
r:   c                   @  st   e Zd ZeZddddœdd„Zdd	„ Zd
d„ Zdd„ Zdd„ Z	ddœdd„Z
ddd„Zdd„ Zeeƒddd„ƒZdS )ÚXportReaderNú
ISO-8859-1zFilePath | ReadBuffer[bytes]z
str | None)Úfilepath_or_bufferÚencodingc                 C  sb   || _ d| _|| _|| _t|d|dd�| _| jj| _z|  ¡  W n t	y\   |  
¡  ‚ Y n0 d S )Nr   ÚrbF)r>   Zis_text)Ú	_encodingÚ_lines_readÚ_indexÚ
_chunksizer   ÚhandlesÚhandler=   Ú_read_headerÚ	ExceptionÚclose)Úselfr=   Úindexr>   Ú	chunksizer   r   r   Ú__init__ü   s    ÿ
zXportReader.__init__c                 C  s   | j  ¡  d S )N)rD   rH   ©rI   r   r   r   rH     s    zXportReader.closec                 C  s   | j  d¡ ¡ S )NéP   )r=   ÚreadÚdecoderM   r   r   r   Ú_get_row  s    zXportReader._get_rowc              	   C  s@  | j  d¡ |  ¡ }|tkr4d|v r,tdƒ‚tdƒ‚|  ¡ }ddgddgd	dgd
dgddgg}t||ƒ}|d dkr|tdƒ‚t|d ƒ|d< || _|  ¡ }t|d d… ƒ|d< |  ¡ }|  ¡ }| t	¡}|t
k}	|rØ|	sàtdƒ‚t|dd… ƒ}
ddgddgddgddgd	dgd
dgddgg}t|  ¡ |ƒ}ddgd
dgddgddgg}| t|  ¡ |ƒ¡ t|d ƒ|d< t|d ƒ|d< || _dddœ}t|  ¡ dd… ƒ}|
| }|d �rÂ|d|d  7 }| j  |¡}g }d}t|ƒ|
k�rÊ|d |
… ||
d …  }}| d¡}t d|¡}ttt|ƒƒ}|d
= ||d   |d < |d! }|d  dk�rv|d"k �sb|dk�rvd#|› d$�}t|ƒ‚| ¡ D ]0\}}z| ¡ ||< W n t�yª   Y n0 �q~||d! 7 }||g7 }�qÖ|  ¡ }|tk�sätd%ƒ‚|| _|| _| j  ¡ | _|  ¡ | _ d&d'„ | jD ƒ| _!d(d'„ t"| jƒD ƒ}t# $|¡}|| _%d S ))Nr   z**COMPRESSED**z<Header record indicates a CPORT file, which is not readable.z#Header record is not an XPORT file.Úprefixr3   Úversionr    ZOSr   Úcreatedé   zSAS     SAS     SASLIBz!Header record has invalid prefix.ÚmodifiedzMember header not foundéûÿÿÿéþÿÿÿÚset_nameZsasdatar   é(   ÚtypeÚnumericÚchar)r.   r/   é6   é:   rN   éŒ   z>hhhh8s40s8shhh2s8shhl52sr
   r   r/   zFloating field width z is not between 2 and 8.zObservation header not found.c                 S  s   g | ]}|d    ¡ ‘qS )r   )rP   )Ú.0Úxr   r   r   Ú
<listcomp>~  ó    z,XportReader._read_header.<locals>.<listcomp>c                 S  s,   g | ]$\}}d t |ƒ dt |d ƒ f‘qS )r   r!   r   )r   )ra   ÚiÚfieldr   r   r   rc   �  s   ÿ)&r=   ÚseekrQ   Ú_correct_line1r   r   r   Ú	file_infoÚ
startswithÚ_correct_header1Ú_correct_header2ÚintÚupdateÚmember_inforO   r'   ÚljustÚstructÚunpackÚdictÚzipÚ
_fieldkeysÚ	TypeErrorÚitemsr   ÚAttributeErrorÚ_correct_obs_headerÚfieldsÚrecord_lengthÚtellÚrecord_startÚ_record_countÚnobsÚcolumnsÚ	enumerater%   r#   Ú_dtype)rI   Úline1Úline2Zfifri   Úline3Úheader1Úheader2Z	headflag1Z	headflag2ZfieldnamelengthZmemro   ÚtypesZ
fieldcountZ
datalengthZ	fielddatarz   Z
obs_lengthZ
fieldbytesZfieldstructrf   ÚflÚmsgÚkÚvÚheaderZdtypelr#   r   r   r   rF     sž    ÿ"

ù	



þ
"


þ
zXportReader._read_headerc                 C  s   | j | jpdd�S )Nr.   ©Únrows)rO   rC   rM   r   r   r   Ú__next__ˆ  s    zXportReader.__next__rm   )r   c                 C  sÈ   | j  dd¡ | j  ¡ | j }|d dkr4t d¡ | jdkrV| j  | j¡ || j S | j  dd¡ | j  d¡}tj	|tj
d�}t |dk¡}t|ƒdkr d}ndt|ƒ }| j  | j¡ || | j S )	zÇ
        Get number of records in file.

        This is maybe suboptimal because we have to seek to the end of
        the file.

        Side effect: returns file position to record_start.
        r   r/   rN   zxport file may be corrupted.i°ÿÿÿr"   l     @@€  r    )r=   rg   r|   r}   ÚwarningsÚwarnr{   rO   r%   Ú
frombufferZuint64Zflatnonzeror'   )rI   Ztotal_records_lengthZlast_card_bytesZ	last_cardÚixZtail_padr   r   r   r~   ‹  s     	


zXportReader._record_countc                 C  s   |du r| j }| j|d�S )a  
        Reads lines from Xport file and returns as dataframe

        Parameters
        ----------
        size : int, defaults to None
            Number of lines to read.  If None, reads whole file.

        Returns
        -------
        DataFrame
        NrŽ   )rC   rO   )rI   Úsizer   r   r   Ú	get_chunk®  s    zXportReader.get_chunkc                 C  sl   |j dd�}|d dk|d dk@ |d dk@ }|d dk|d d	k@ |d d
kB |d dkB }||M }|S )Nzu1,u1,u2,u4r"   r-   r   Úf2Zf3r$   r5   éZ   é_   é.   )r(   )rI   r)   rŒ   ÚmissZmiss1r   r   r   Ú_missing_double¿  s    $
ÿ
þÿzXportReader._missing_doublec                   sf  |d u rˆ j }t|ˆ j ˆ j ƒ}|ˆ j }|dkr>ˆ  ¡  t‚ˆ j |¡}tj	|ˆ j
|d�}tjt|ƒd�}tˆ jƒD ]¨\}}|dt|ƒ  }	ˆ j| d }
|
dkrÖt|	ˆ j| d ƒ}	ˆ  |	¡}t|	ƒ}tj||< n@ˆ j| d dk�rd	d
„ |	D ƒ}ˆ jd u�r‡ fdd
„|D ƒ}|||< qvˆ jd u �rHt tˆ jˆ j| ƒ¡|_n| ˆ j¡}ˆ  j|7  _|S )Nr   )r#   Úcount)rJ   r   r
   r\   r   r]   c                 S  s   g | ]}|  ¡ ‘qS r   )Úrstrip©ra   Úyr   r   r   rc   â  rd   z$XportReader.read.<locals>.<listcomp>c                   s   g | ]}|  ˆ j¡‘qS r   )rP   r@   rŸ   rM   r   r   rc   å  rd   )r   ÚminrA   r{   rH   ÚStopIterationr=   rO   r%   r“   r‚   r   Z	DataFrameÚranger�   r€   r   rz   r,   rœ   r:   Únanr@   rB   ÚIndexrJ   Z	set_index)rI   r�   Ú
read_linesÚread_lenÚrawÚdataZdfÚjrb   r)   r
   r›   rŒ   r   rM   r   rO   Ê  s8    


zXportReader.read)Nr<   N)N)N)Ú__name__Ú
__module__Ú__qualname__Ú_xport_reader_docÚ__doc__rL   rH   rQ   rF   r�   r~   r–   rœ   r   Ú_read_method_docrO   r   r   r   r   r;   ù   s      ûn#
r;   )'r¯   Ú
__future__r   Úcollectionsr   r   rq   r‘   Únumpyr%   Zpandas._typingr   r   Zpandas.util._decoratorsr   Zpandasr   Zpandas.io.commonr   Zpandas.io.sas.sasreaderr	   rh   rk   rl   ry   ru   Z_base_params_docZ_params2_docZ_format_params_docZ_iterator_docZ_read_sas_docr®   r°   r   r   r,   r:   ÚIteratorr;   r   r   r   r   Ú<module>   sX   	ÿÿÿÿþýüûýü	9