a
    Of;                  	   @  sB  d Z ddlmZ ddlmZ ddlmZ ddlZddlmZ ddl	Z	ddl
ZddlmZ ddlmZ ddlZdd	lmZ dd
lmZ erddlmZmZmZ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$de  de! dZ%dZ&dddddZ'dd d!d"Z(d#d$ Z)d%d& Z*G d'd( d(eej+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
    )annotations)abc)datetimeN)TYPE_CHECKING)Appender)find_stack_level)
get_handle)
ReaderBase)CompressionOptionsDatetimeNaTTypeFilePath
ReadBufferzPHEADER RECORD*******LIBRARY HEADER RECORD!!!!!!!000000000000000000000000000000  zKHEADER RECORD*******MEMBER  HEADER RECORD!!!!!!!000000000000000001600000000zPHEADER RECORD*******DSCRPTR HEADER RECORD!!!!!!!000000000000000000000000000000  zPHEADER RECORD*******OBS     HEADER RECORD!!!!!!!000000000000000000000000000000  )ntypeZnhfunfield_lengthZnvar0namelabelZnformZnflZnum_decimalsZnfjZnfillZniformZniflZnifdZnpos_zParameters
----------
filepath_or_buffer : str or file-like object
    Path to SAS file or object implementing binary read method.zindex : 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.


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.

z

Attributes
----------
member_info : list
    Contains information about the file
fields : list
    Contains information about the variables in the file
zRead 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.
strr   )datestr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   strptime
ValueErrorpdZNaT)r    r   P/var/www/ai-form-bot/venv/lib/python3.9/site-packages/pandas/io/sas/sas_xport.py_parse_date   s    r   )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   )strip)r   partsoutstartr   lengthr   r   r   _split_line   s    
r#   c                 C  sT   |dkrPt t| t d}t d| dd|  }|j|d}| |d< |S | S )N   ZS8Sz,Sdtypef0)npzeroslenr'   view)vecnbytesvec1r'   Zvec2r   r   r   _handle_truncated_float_vec   s    	r0   c           	      C  s  t d}| j|d}|d }|d }|d@ }t jt| 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|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(   f1i    i       i  @    i         l          A   i     l        z>f8Zf8)	r)   r'   r,   r*   r+   Zuint8whereemptyZastype)	r-   r'   r/   Zxport1Zxport2Zieee1shiftZieee2Zieeer   r   r   _parse_float_vec   s*    
		 
r>   c                   @  s   e Zd ZeZd!dddddd	d
dZddddZdd ZddddZddddZ	ddddZ
d"dddddZdd Zeed#ddddd ZdS )$XportReaderN
ISO-8859-1inferzFilePath | ReadBuffer[bytes]z
str | Nonez
int | Noner
   None)filepath_or_bufferencoding	chunksizecompressionr   c                 C  sd   || _ d| _|| _|| _t|d|d|d| _| jj| _z|   W n t	y^   | 
   Y n0 d S )Nr   rbF)rD   Zis_textrF   )	_encoding_lines_read_index
_chunksizer   handleshandlerC   _read_header	Exceptionclose)selfrC   indexrD   rE   rF   r   r   r   __init__  s"    
zXportReader.__init__)r   c                 C  s   | j   d S )N)rL   rP   rQ   r   r   r   rP     s    zXportReader.closec                 C  s   | j d S )NP   )rC   readdecoderT   r   r   r   _get_row   s    zXportReader._get_rowc              	   C  s@  | j d |  }|tkr4d|v r,tdtd|  }ddgddgd	dgd
dgddgg}t||}|d dkr|tdt|d |d< || _|  }t|d d |d< |  }|  }|t	}|t
k}	|r|	stdt|dd }
ddgddgddgddgd	dgd
dgddgg}t|  |}ddgd
dgddgddgg}|t|  | t|d |d< t|d |d< || _ddd}t|  dd }|
| }|d r|d|d  7 }| j |}g }d}t||
kr|d |
 ||
d   }}|d}td|}ttt|}|d
= ||d   |d < |d! }|d  dkrv|d"k sb|dkrvd#| d$}t|| D ]0\}}z| ||< W n ty   Y n0 q~||d! 7 }||g7 }q|  }|tkstd%|| _|| _| j  | _|  | _ d&d' | jD | _!d(d' t"| jD }t#$|}|| _%d S ))Nr   z**COMPRESSED**z<Header record indicates a CPORT file, which is not readable.z#Header record is not an XPORT file.prefixr7   versionr$   ZOSr   created   zSAS     SAS     SASLIBz!Header record has invalid prefix.modifiedzMember header not foundset_nameZsasdatar   (   typenumericchar)r2   r3   6   :   rU      z>hhhh8s40s8shhh2s8shhl52sr   r   r3   zFloating field width z is not between 2 and 8.zObservation header not found.c                 S  s   g | ]}|d    qS )r   )rW   ).0xr   r   r   
<listcomp>      z,XportReader._read_header.<locals>.<listcomp>c                 S  s,   g | ]$\}}d t | dt |d  fqS )r   r%   r   )r   )rh   ifieldr   r   r   rj     s   )&rC   seekrX   _correct_line1r   r#   r   	file_info
startswith_correct_header1_correct_header2intupdatemember_inforV   r+   ljuststructunpackdictzip
_fieldkeys	TypeErroritemsr   AttributeError_correct_obs_headerfieldsrecord_lengthtellrecord_start_record_countnobscolumns	enumerater)   r'   _dtype)rQ   line1line2fifrp   line3Zheader1Zheader2Z	headflag1Z	headflag2ZfieldnamelengthZmemrv   typesZ
fieldcountZ
datalengthZ	fielddatar   Z
obs_lengthZ
fieldbytesZfieldstructrm   flmsgkvheaderZdtypelr'   r   r   r   rN   #  s    "

	




"



zXportReader._read_headerzpd.DataFramec                 C  s   | j | jpddS )Nr2   nrows)rV   rK   rT   r   r   r   __next__  s    zXportReader.__next__rt   c                 C  s   | j dd | j  | j }|d dkr:tjdt d | jdkr\| j | j || j S | j dd | j d}t	j
|t	jd}t	|dk}t|dkrd}nd	t| }| j | j || | j S )
z
        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   r3   rU   zxport file may be corrupted.)
stacklevelir&   l     @@  r$   )rC   rn   r   r   warningswarnr   r   rV   r)   
frombufferZuint64Zflatnonzeror+   )rQ   Ztotal_records_lengthZlast_card_bytesZ	last_cardZixZtail_padr   r   r   r     s&    	

zXportReader._record_count)sizer   c                 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
        Nr   )rK   rV   )rQ   r   r   r   r   	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&   r1   r   f2Zf3r(   r9   Z   _   .   )r,   )rQ   r-   r   missZmiss1r   r   r   _missing_double  s    $

zXportReader._missing_double)r   r   c                   sj  |d u r j }t| j  j }| j }|dkr>   t j|}tj	| j
|d}i }t jD ]\}}|dt|  }	 j| d }
|
dkrt|	 j| d }	 |	}t|	}tj||< n@ j| d dkr
dd	 |	D } jd ur
 fd
d	|D }|||i qjt|} jd u rLtt j j| |_n| j}  j|7  _|S )Nr   )r'   countr   r   rc   r   rd   c                 S  s   g | ]}|  qS r   )rstriprh   yr   r   r   rj     rk   z$XportReader.read.<locals>.<listcomp>c                   s   g | ]}|  jqS r   )rW   rH   r   rT   r   r   rj     rk   )r   minrI   r   rP   StopIterationrC   rV   r)   r   r   r   r   r   r   r0   r   r>   nanrH   ru   r   Z	DataFramerJ   IndexrangerR   Z	set_index)rQ   r   Z
read_linesread_lenrawdataZdf_datajri   r-   r   r   r   Zdfr   rT   r   rV     s:    


zXportReader.read)Nr@   NrA   )N)N)__name__
__module____qualname___xport_reader_doc__doc__rS   rP   rX   rN   r   r   r   r   r   _read_method_docrV   r   r   r   r   r?      s       n&r?   )-r   
__future__r   collectionsr   r   rx   typingr   r   numpyr)   Zpandas.util._decoratorsr   Zpandas.util._exceptionsr   Zpandasr   Zpandas.io.commonr   Zpandas.io.sas.sasreaderr	   Zpandas._typingr
   r   r   r   ro   rr   rs   r   r|   Z_base_params_docZ_params2_docZ_format_params_docZ_iterator_docZ_read_sas_docr   r   r   r#   r0   r>   Iteratorr?   r   r   r   r   <module>   s^   		9