a
    Ofk                     @  sH  d Z ddlmZ ddlmZ ddlmZmZ ddlZddlm	Z	 ddl
ZddlmZmZmZmZmZ ddlmZmZ dd	lmZ dd
lmZ ddlZddlmZmZmZ ddlmZ ddl m!  m"  m#Z$ ddl%m&Z& e	rddl'm(Z(m)Z)m*Z* edZ+edZ,dddddZ-ddddddZ.G dd dZ/G dd de&ej0Z1dS )a  
Read SAS7BDAT files

Based on code written by Jared Hobbs:
  https://bitbucket.org/jaredhobbs/sas7bdat

See also:
  https://github.com/BioStatMatt/sas7bdat

Partial documentation of the file format:
  https://cran.r-project.org/package=sas7bdat/vignettes/sas7bdat.pdf

Reference for binary data compression:
  http://collaboration.cmc.ec.gc.ca/science/rpn/biblio/ddj/Website/articles/CUJ/1992/9210/ross/ross.htm
    )annotations)abc)datetime	timedeltaN)TYPE_CHECKING)read_double_with_byteswapread_float_with_byteswapread_uint16_with_byteswapread_uint32_with_byteswapread_uint64_with_byteswap)Parserget_subheader_index)cast_from_unit_vectorized)EmptyDataError)	DataFrame	Timestampisna)
get_handle)
ReaderBase)CompressionOptionsFilePath
ReadBufferz
1970-01-01z
1960-01-01floatstrZsas_datetimeunitc                 C  sV   t | rtjS |dkr,tdddt| d S |dkrJtdddt| d S tdd S )Ns     )secondsd)dayszunit must be 'd' or 's')r   pdZNaTr   r   
ValueErrorr    r$   O/var/www/ai-form-bot/venv/lib/python3.9/site-packages/pandas/io/sas/sas7bdat.py_parse_datetimeA   s    r&   z	pd.Series)sas_datetimesr   returnc                 C  sp   t t d}|dkrFt| jddd}|d| }tj|| jddS t	j
| dd| }tj|d	| jdd
S dS )a  
    Convert to Timestamp if possible, otherwise to datetime.datetime.
    SAS float64 lacks precision for more than ms resolution so the fit
    to datetime.datetime is ok.

    Parameters
    ----------
    sas_datetimes : {Series, Sequence[float]}
       Dates or datetimes in SAS
    unit : {'d', 's'}
       "d" if the floats represent dates, "s" for datetimes

    Returns
    -------
    Series
       Series of datetime64 dtype or datetime.datetime.
    r   ms)r   Zout_unitzM8[ms]FindexcopyzM8[D]dtypezM8[s]r.   r+   r,   N)_sas_origin_unix_originZas_unitr   Z_valuesviewr"   Seriesr+   nparray)r'   r   tdZmillisZdt64msvalsr$   r$   r%   _convert_datetimesO   s    r8   c                   @  sX   e Zd ZU ded< ded< ded< ded< ded< ded	< ddddddd
dddZdS )_Columnintcol_idstr | bytesnamelabelformatbytesctypelengthNone)r;   r=   r>   r?   rA   rB   r(   c                 C  s(   || _ || _|| _|| _|| _|| _d S N)r;   r=   r>   r?   rA   rB   )selfr;   r=   r>   r?   rA   rB   r$   r$   r%   __init__u   s    
z_Column.__init__N)__name__
__module____qualname____annotations__rF   r$   r$   r$   r%   r9   m   s   
r9   c                   @  s  e Zd ZU dZded< ded< dSd	d
d
ddd
d
ddd	ddZddddZddddZddddZddddZ	ddddZ
dddd Zddd!d"d#Zdddd$d%d&Zddd'd(d)Zddd*d+d,d-Zddd.d/Zd
dd0d1Zddd2d3Zddd4d5Zdddd+d6d7Zdddd+d8d9Zdddd+d:d;Zdddd+d<d=Zdddd+d>d?Zdddd+d@dAZdddd+dBdCZdddd+dDdEZdTdddFdGdHZdIdJ ZdddKdLZdMdN ZdOd*dPdQdRZ dS )USAS7BDATReadera  
    Read SAS files in SAS7BDAT format.

    Parameters
    ----------
    path_or_buf : path name or buffer
        Name of SAS file or file-like object pointing to SAS file
        contents.
    index : column identifier, defaults to None
        Column to use as index.
    convert_dates : bool, defaults to True
        Attempt to convert dates to Pandas datetime values.  Note that
        some rarely used SAS date formats may be unsupported.
    blank_missing : bool, defaults to True
        Convert empty strings to missing values (SAS uses blanks to
        indicate missing character variables).
    chunksize : int, defaults to None
        Return SAS7BDATReader object for iterations, returns chunks
        with given number of lines.
    encoding : str, 'infer', defaults to None
        String encoding acc. to Python standard encodings,
        encoding='infer' tries to detect the encoding from the file header,
        encoding=None will leave the data in binary format.
    convert_text : bool, defaults to True
        If False, text variables are left as raw bytes.
    convert_header_text : bool, defaults to True
        If False, header text, including column names, are left as raw
        bytes.
    r:   _int_lengthzbytes | None_cached_pageNTinferzFilePath | ReadBuffer[bytes]boolz
int | Nonez
str | Noner   rC   )	path_or_bufconvert_datesblank_missing	chunksizeencodingconvert_textconvert_header_textcompressionr(   c
           
   	   C  s   || _ || _|| _|| _|| _|| _|| _d| _d| _g | _	g | _
g | _g | _g | _d | _g | _g | _g | _d| _d| _d| _t|dd|	d| _| jj| _| j| j| j| j| j| j| j| jd g	| _ z| !  | "  W n t#y   | $   Y n0 d S )Nzlatin-1    r   rbF)Zis_textrW   )%r+   rQ   rR   rS   rT   rU   rV   default_encodingrW   column_names_rawcolumn_namescolumn_formatscolumns%_current_page_data_subheader_pointersrM   _column_data_lengths_column_data_offsets_column_types_current_row_in_file_indexZ_current_row_on_page_indexr   handleshandle_path_or_buf_process_rowsize_subheader_process_columnsize_subheader_process_subheader_counts_process_columntext_subheader_process_columnname_subheader#_process_columnattributes_subheader_process_format_subheader_process_columnlist_subheader_subheader_processors_get_properties_parse_metadata	Exceptionclose)
rE   rP   r+   rQ   rR   rS   rT   rU   rV   rW   r$   r$   r%   rF      sR    
zSAS7BDATReader.__init__z
np.ndarray)r(   c                 C  s   t j| jt jdS )z5Return a numpy int64 array of the column data lengthsr-   )r4   asarrayr`   int64rE   r$   r$   r%   column_data_lengths   s    z"SAS7BDATReader.column_data_lengthsc                 C  s   t j| jt jdS )z0Return a numpy int64 array of the column offsetsr-   )r4   rt   ra   ru   rv   r$   r$   r%   column_data_offsets   s    z"SAS7BDATReader.column_data_offsetsc                 C  s   t j| jt ddS )zj
        Returns a numpy character array of the column types:
           s (string) or d (double)
        ZS1r-   )r4   rt   rb   r.   rv   r$   r$   r%   column_types   s    zSAS7BDATReader.column_typesc                 C  s   | j   d S rD   )rd   rs   rv   r$   r$   r%   rs      s    zSAS7BDATReader.closec                 C  s
  | j d | j d| _| jdttj tjkr<td| tj	tj
}|tjkrtd| _d| _tj| _tj| _nd| _tj| _tj| _d| _| tjtj}|tjkrtj}nd}| tjtj}|dkrd	| _tjd
k| _nd| _tjdk| _| tjtjd }|tj v r6tj | | _!| j"dkrD| j!| _"nd| d| _!t#ddd}| $tj%| tj&}|t'j(|dd | _)| $tj*| tj+}|t'j(|dd | _,| -tj.| tj/| _0| j | j0d }|  j|7  _t| j| j0krtd| -tj1| tj2| _3d S )Nr   i   z'magic number mismatch (not a SAS file?)T   F      <big>littlerN   zunknown (code=)r   r   r   )r   z*The SAS7BDAT file appears to be truncated.)4rf   seekreadrM   lenconstmagicr#   _read_bytesZalign_1_offsetZalign_1_lengthZu64_byte_checker_valueU64rL   Zpage_bit_offset_x64_page_bit_offsetZsubheader_pointer_length_x64_subheader_pointer_lengthZpage_bit_offset_x86Zsubheader_pointer_length_x86Zalign_2_offsetZalign_2_lengthZalign_1_checker_valueZalign_2_valueZendianness_offsetZendianness_length
byte_ordersys	byteorderneed_byteswapZencoding_offsetZencoding_lengthZencoding_namesZinferred_encodingrT   r   _read_floatZdate_created_offsetZdate_created_lengthr"   Zto_timedeltaZdate_createdZdate_modified_offsetZdate_modified_lengthZdate_modified
_read_uintZheader_size_offsetZheader_size_lengthheader_lengthZpage_size_offsetZpage_size_length_page_length)rE   bufZalign1epochxr$   r$   r%   rp      sb    



zSAS7BDATReader._get_propertiesr   c                 C  s(   | j | jpdd}|jr$|   t|S )Nr   )nrows)r   rS   emptyrs   StopIteration)rE   dar$   r$   r%   __next__A  s
    zSAS7BDATReader.__next__)offsetwidthc                 C  sR   | j d usJ |dkr&t| j || jS |dkr>t| j || jS |   tdd S )Nr{   rz   zinvalid float width)rM   r   r   r   rs   r#   rE   r   r   r$   r$   r%   r   I  s    

zSAS7BDATReader._read_float)r   r   r(   c                 C  s   | j d usJ |dkr&| |dd S |dkr>t| j || jS |dkrVt| j || jS |dkrnt| j || jS |   tdd S )Nr   r      r{   rz   zinvalid int width)rM   r   r	   r   r
   r   rs   r#   r   r$   r$   r%   r   X  s"    


zSAS7BDATReader._read_uint)r   rB   c                 C  sB   | j d usJ || t| j kr0|   td| j |||  S )NzThe cached page is too small.)rM   r   rs   r#   rE   r   rB   r$   r$   r%   r   l  s
    zSAS7BDATReader._read_bytesr<   )r   rB   r(   c                 C  s   |  | ||dS )N     )_convert_header_textr   rstripr   r$   r$   r%   _read_and_convert_header_texts  s    z,SAS7BDATReader._read_and_convert_header_textc                 C  sN   d}|sJ| j | j| _t| jdkr(qJt| j| jkr@td|  }qd S )NFr   z2Failed to read a meta data page from the SAS file.)rf   r   r   rM   r   r#   _process_page_meta)rE   doner$   r$   r%   rq   x  s    zSAS7BDATReader._parse_metadatac                 C  sZ   |    tjtjtjg }| j|v r,|   | jtjk}| jtjk}t|pV|pV| j	g kS rD   )
_read_page_headerr   page_meta_typesZpage_amd_typepage_mix_type_current_page_type_process_page_metadatapage_data_typerO   r_   )rE   ptZis_data_pageZis_mix_pager$   r$   r%   r     s    
z!SAS7BDATReader._process_page_metac                 C  s^   | j }tj| }| |tjtj@ | _tj| }| |tj| _	tj
| }| |tj| _d S rD   )r   r   Zpage_type_offsetr   Zpage_type_lengthZpage_type_mask2r   Zblock_count_offsetZblock_count_lengthZ_current_page_block_countZsubheader_count_offsetZsubheader_count_length_current_page_subheaders_count)rE   
bit_offsetZtxr$   r$   r%   r     s    


z SAS7BDATReader._read_page_headerc                 C  s  | j }t| jD ]}tj| }|| j|  }| || j}|| j7 }| || j}|| j7 }| |d}|d7 }| |d}|dks|tjkrq| 	|| j}	t
|	}
| j|
 }|d u r|tjdfv }|tjk}| jr|r|r| j||f n|   td|	 q||| qd S )Nr   r   zUnknown subheader signature )r   ranger   r   Zsubheader_pointers_offsetr   r   rL   Ztruncated_subheader_idr   r   ro   Zcompressed_subheader_idZcompressed_subheader_typerW   r_   appendrs   r#   )rE   r   ir   Ztotal_offsetZsubheader_offsetZsubheader_lengthZsubheader_compressionZsubheader_typeZsubheader_signatureZsubheader_indexZsubheader_processorf1f2r$   r$   r%   r     s>    





z%SAS7BDATReader._process_page_metadatac                 C  s   | j }|}|}| jr&|d7 }|d7 }n|d7 }|d7 }| |tj|  || _| |tj|  || _| |tj|  || _	| |tj
|  || _tj| }| || || _| |d| _| |d| _d S )Ni  i  ib  iz  r   )rL   r   r   r   Zrow_length_offset_multiplierZ
row_lengthZrow_count_offset_multiplier	row_countZcol_count_p1_multipliercol_count_p1Zcol_count_p2_multipliercol_count_p2Z'row_count_on_mix_page_offset_multiplierZ_mix_page_row_count_lcs_lcp)rE   r   rB   int_lenZ
lcs_offsetZ
lcp_offsetZmxr$   r$   r%   rg     s4    

z)SAS7BDATReader._process_rowsize_subheaderc                 C  sT   | j }||7 }| ||| _| j| j | jkrPtd| j d| j d| j d d S )Nz Warning: column count mismatch (z + z != z)
)rL   r   column_countr   r   print)rE   r   rB   r   r$   r$   r%   rh     s    
z,SAS7BDATReader._process_columnsize_subheaderc                 C  s   d S rD   r$   r   r$   r$   r%   ri     s    z(SAS7BDATReader._process_subheader_countsc           	      C  s  || j 7 }| |tj}| ||}|d| d}| j| t| jdkrd}tj	D ]}||v r\|}q\|| _
|| j 8 }|d }| jr|d7 }| || j}|d}|dkrd| _|d }| jr|d7 }| || j}|d| j | _n|tjkr4|d	 }| jr|d7 }| || j}|d| j | _nH| jdkr|d| _|d }| jr^|d7 }| || j}|d| j | _t| d
r| | j| _d S )Nr   r   r   rX      r{           (   creator_proc)rL   r   r   Ztext_block_size_lengthr   r   r[   r   r   Zcompression_literalsrW   r   r   r   r   Zrle_compressionhasattrr   )	rE   r   rB   Ztext_block_sizer   Z	cname_rawZcompression_literalclZoffset1r$   r$   r%   rj     sN    



z,SAS7BDATReader._process_columntext_subheaderc                 C  s   | j }||7 }|d|  d d }t|D ]}|tj|d   tj }|tj|d   tj }|tj|d   tj }| |tj}	| |tj	}
| |tj
}| j|	 }||
|
|  }| j| | q*d S )Nr      rz   r   )rL   r   r   Zcolumn_name_pointer_lengthZ!column_name_text_subheader_offsetZcolumn_name_offset_offsetZcolumn_name_length_offsetr   Z!column_name_text_subheader_lengthZcolumn_name_offset_lengthZcolumn_name_length_lengthr[   r\   r   r   )rE   r   rB   r   Zcolumn_name_pointers_countr   Ztext_subheaderZcol_name_offsetZcol_name_lengthidx
col_offsetZcol_lenZname_rawcnamer$   r$   r%   rk      s@    
z,SAS7BDATReader._process_columnname_subheaderc           
      C  s   | j }|d|  d |d  }t|D ]}|| tj ||d   }|d|  tj ||d   }|d|  tj ||d   }| ||}	| j|	 | |tj	}	| j
|	 | |tj}	| j|	dkrdnd q&d S )Nr   r   rz   r      d   s)rL   r   r   Zcolumn_data_offset_offsetZcolumn_data_length_offsetZcolumn_type_offsetr   ra   r   Zcolumn_data_length_lengthr`   Zcolumn_type_lengthrb   )
rE   r   rB   r   Zcolumn_attributes_vectors_countr   Zcol_data_offsetZcol_data_lenZ	col_typesr   r$   r$   r%   rl   A  s*    
z2SAS7BDATReader._process_columnattributes_subheaderc                 C  s   d S rD   r$   r   r$   r$   r%   rn   [  s    z,SAS7BDATReader._process_columnlist_subheaderc                 C  sx  | j }|tj d|  }|tj d|  }|tj d|  }|tj d|  }|tj d|  }|tj d|  }	| |tj	}
t
|
t| jd }| |tj}| |tj}| |tj}t
|t| jd }| |tj}| |	tj}| j| }| ||||  }| j| }| ||||  }t| j}t|| j| ||| j| | j| }| j| | j| d S )N   r   )rL   r   Z)column_format_text_subheader_index_offsetZcolumn_format_offset_offsetZcolumn_format_length_offsetZ(column_label_text_subheader_index_offsetZcolumn_label_offset_offsetZcolumn_label_length_offsetr   Z)column_format_text_subheader_index_lengthminr   r[   Zcolumn_format_offset_lengthZcolumn_format_length_lengthZ(column_label_text_subheader_index_lengthZcolumn_label_offset_lengthZcolumn_label_length_lengthr   r^   r9   r\   rb   r`   r]   r   )rE   r   rB   r   Ztext_subheader_formatZcol_format_offsetZcol_format_lenZtext_subheader_labelZcol_label_offsetZcol_label_lenr   Z
format_idxZformat_startZ
format_lenZ	label_idxZlabel_startZ	label_lenZlabel_namesZcolumn_labelZformat_namesZcolumn_formatZcurrent_column_numbercolr$   r$   r%   rm   _  sX    


	z(SAS7BDATReader._process_format_subheader)r   r(   c                 C  s   |d u r| j d ur| j }n|d u r(| j}t| jdkrF|   td|dkr`| j| jkr`t S t|| j| j }| j	d}| j	d}t
j||ftd| _t
j|d| ft
jd| _d| _t| }|| |  }| jd ur|| j}|S )Nr   zNo columns to parse from filer   r   r-   rz   )rS   r   r   rb   rs   r   rc   r   r   countr4   r   object_string_chunkZzerosZuint8_byte_chunk_current_row_in_chunk_indexr   r   _chunk_to_dataframer+   Z	set_index)rE   r   ndnsprsltr$   r$   r%   r     s*    

zSAS7BDATReader.readc                 C  s   g | _ | j| j| _t| jdkr(dS t| j| jkrf|   dt| jdd| jdd}t||   | j	t
jv r|   | j	t
jt
jt
jg vr|  S dS )Nr   Tz-failed to read complete page from file (read r    z of z bytes)F)r_   rf   r   r   rM   r   rs   r#   r   r   r   r   r   r   r   _read_next_page)rE   msgr$   r$   r%   r     s,    
zSAS7BDATReader._read_next_pagec                 C  sx  | j }| j}t|| |}i }d\}}t| jD ].}| j| }| j| dkr| j|d d f j| jd d}	t	j
|	tj|dd||< | jr| j| tjv rt|| d||< n"| j| tjv rt|| d||< |d7 }q0| j| d	kr@t	j
| j|d d f |dd
||< | jr6| jd ur6| || j||< |d7 }q0|   tdt| j|  q0t|| j|dd}
|
S )N)r   r   r   r    r-   Fr/   r   r   r   r*   zunknown column type )r^   r+   r,   )r   rc   r   r   r\   rb   r   r2   r   r"   r3   r4   Zfloat64rQ   r]   r   Zsas_date_formatsr8   Zsas_datetime_formatsr   rU   rT   _decode_stringr   rs   r#   reprr   )rE   nmZixr   jsZjbjr=   Zcol_arrZdfr$   r$   r%   r     s2    
 
"
z"SAS7BDATReader._chunk_to_dataframec                 C  s   | | jp| jS rD   )decoderT   rZ   rE   br$   r$   r%   r     s    zSAS7BDATReader._decode_stringr@   )r   r(   c                 C  s   | j r| |S |S d S rD   )rV   r   r   r$   r$   r%   r     s    
z#SAS7BDATReader._convert_header_text)NTTNNTTrN   )N)!rG   rH   rI   __doc__rJ   rF   rw   rx   ry   rs   rp   r   r   r   r   r   rq   r   r   r   rg   rh   ri   rj   rk   rl   rn   rm   r   r   r   r   r   r$   r$   r$   r%   rK      sN   
         ?F
+-!7rK   )2r   
__future__r   collectionsr   r   r   r   typingr   numpyr4   Zpandas._libs.byteswapr   r   r	   r
   r   Zpandas._libs.sasr   r   Zpandas._libs.tslibs.conversionr   Zpandas.errorsr   Zpandasr"   r   r   r   Zpandas.io.commonr   Zpandas.io.sas.sas_constantsiosasZsas_constantsr   Zpandas.io.sas.sasreaderr   Zpandas._typingr   r   r   r1   r0   r&   r8   r9   IteratorrK   r$   r$   r$   r%   <module>   s.   