o
    ҷh;j                     @  s"  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	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mZ ddlZdd
lmZmZ ddlmZ ddlm   m!  m"Z# ddl$m%Z% e	rtddl&m'Z'm(Z(m)Z) dddZ*dddZ+G dd dZ,G dd de%ej-Z.d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cast)read_double_with_byteswapread_float_with_byteswapread_uint16_with_byteswapread_uint32_with_byteswapread_uint64_with_byteswap)Parserget_subheader_index)EmptyDataErrorOutOfBoundsDatetime)	DataFrameisna)
get_handle)
ReaderBase)CompressionOptionsFilePath
ReadBuffersas_datetimefloatunitstrc                 C  sR   t | rtjS |dkrtdddt| d S |dkr%tdddt| d S td)Ns     )secondsd)dayszunit must be 'd' or 's')r   pdNaTr   r   
ValueError)r   r    r%   I/var/www/html/venv/lib/python3.10/site-packages/pandas/io/sas/sas7bdat.py_parse_datetimeA   s   r'   sas_datetimes	pd.Seriesreturnc                 C  sD   z	t j| |ddW S  ty!   | jt|d}tt j|}| Y S w )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 : {str}
       "d" if the floats represent dates, "s" for datetimes

    Returns
    -------
    Series
       Series of datetime64 dtype or datetime.datetime.
    z
1960-01-01)r   originr   )r"   to_datetimer   applyr'   r   Series)r(   r   s_seriesr%   r%   r&   _convert_datetimesO   s   r1   c                   @  sH   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ZdS )_Columnintcol_idstr | bytesnamelabelformatbytesctypelengthr*   Nonec                 C  s(   || _ || _|| _|| _|| _|| _d S N)r4   r6   r7   r8   r:   r;   )selfr4   r6   r7   r8   r:   r;   r%   r%   r&   __init__q   s   

z_Column.__init__N)r4   r3   r6   r5   r7   r5   r8   r5   r:   r9   r;   r3   r*   r<   )__name__
__module____qualname____annotations__r?   r%   r%   r%   r&   r2   i   s   
 r2   c                   @  sJ  e Zd ZU dZded< ded< 								dYdZddZd[ddZd[ddZd[dd Zd\d!d"Z	d\d#d$Z
d]d&d'Zd^d*d+Zd_d,d-Zd`d/d0Zdad2d3Zd\d4d5Zdbd6d7Zd\d8d9Zd\d:d;Zdcd<d=Zdcd>d?Zdcd@dAZdcdBdCZdcdDdEZdcdFdGZdcdHdIZdcdJdKZdddedMdNZdOdP Zd]dQdRZdSdT ZdfdWdXZ dS )g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.
    r3   _int_lengthzbytes | None_cached_pageNTinferpath_or_bufFilePath | ReadBuffer[bytes]convert_datesboolblank_missing	chunksize
int | Noneencoding
str | Noneconvert_textconvert_header_textcompressionr   r*   r<   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 d S  t#yx   | $   w )Nzlatin-1    r   rbF)is_textrS   )%indexrJ   rL   rM   rO   rQ   rR   default_encodingrS   column_names_rawcolumn_namescolumn_formatscolumns%_current_page_data_subheader_pointersrF   _column_data_lengths_column_data_offsets_column_types_current_row_in_file_index_current_row_on_page_indexr   handleshandle_path_or_buf_process_rowsize_subheader_process_columnsize_subheader_process_subheader_counts_process_columntext_subheader_process_columnname_subheader#_process_columnattributes_subheader_process_format_subheader_process_columnlist_subheader_subheader_processors_get_properties_parse_metadata	Exceptionclose)
r>   rH   rW   rJ   rL   rM   rO   rQ   rR   rS   r%   r%   r&   r?      sT   
zSAS7BDATReader.__init__
np.ndarrayc                 C     t j| jt jdS )z5Return a numpy int64 array of the column data lengthsdtype)npasarrayr^   int64r>   r%   r%   r&   column_data_lengths      z"SAS7BDATReader.column_data_lengthsc                 C  rt   )z0Return a numpy int64 array of the column offsetsru   )rw   rx   r_   ry   rz   r%   r%   r&   column_data_offsets   r|   z"SAS7BDATReader.column_data_offsetsc                 C  s   t j| jt ddS )zj
        Returns a numpy character array of the column types:
           s (string) or d (double)
        S1ru   )rw   rx   r`   rv   rz   r%   r%   r&   column_types   s   zSAS7BDATReader.column_typesc                 C  s   | j   d S r=   )rc   rr   rz   r%   r%   r&   rr      s   zSAS7BDATReader.closec                 C  s  | j d | j d| _| jdttj tjkrtd| tj	tj
}|tjkr:d| _d| _tj| _tj| _nd| _tj| _tj| _d| _| tjtj}|tjkrYtj}nd}| tjtj}|dkrqd	| _tjd
k| _n	d| _tjdk| _| tjtjd }|tj v rtj | | _!| j"dkr| j!| _"nd| d| _!t#ddd}| $tj%| tj&}|t'j(|dd | _)| $tj*| tj+}|t'j(|dd | _,| -tj.| tj/| _0| j | j0d }|  j|7  _t| j| j0krtd| -tj1| tj2| _3d S )Nr   i   z'magic number mismatch (not a SAS file?)T   F      <big>littlerG   zunknown (code=)r   r   r   r,   z*The SAS7BDAT file appears to be truncated.)4re   seekreadrF   lenconstmagicr$   _read_bytesalign_1_offsetalign_1_lengthu64_byte_checker_valueU64rE   page_bit_offset_x64_page_bit_offsetsubheader_pointer_length_x64_subheader_pointer_lengthpage_bit_offset_x86subheader_pointer_length_x86align_2_offsetalign_2_lengthalign_1_checker_valuealign_2_valueendianness_offsetendianness_length
byte_ordersys	byteorderneed_byteswapencoding_offsetencoding_lengthencoding_namesinferred_encodingrO   r   _read_floatdate_created_offsetdate_created_lengthr"   to_timedeltadate_createddate_modified_offsetdate_modified_lengthdate_modified
_read_uintheader_size_offsetheader_size_lengthheader_lengthpage_size_offsetpage_size_length_page_length)r>   bufalign1epochxr%   r%   r&   ro      sd   





zSAS7BDATReader._get_propertiesr   c                 C  s(   | j | jpdd}|jr|   t|S )Nr   )nrows)r   rM   emptyrr   StopIteration)r>   dar%   r%   r&   __next__=  s
   zSAS7BDATReader.__next__offsetwidthc                 C  sN   | j d usJ |dkrt| j || jS |dkrt| j || jS |   td)Nr   r   zinvalid float width)rF   r	   r   r   rr   r$   r>   r   r   r%   r%   r&   r   E  s   

zSAS7BDATReader._read_floatc                 C  s~   | j d usJ |dkr| |dd S |dkrt| j || jS |dkr+t| j || jS |dkr7t| j || jS |   td)Nr   r      r   r   zinvalid int width)rF   r   r
   r   r   r   rr   r$   r   r%   r%   r&   r   T  s"   


zSAS7BDATReader._read_uintr;   c                 C  sB   | j d usJ || t| j kr|   td| j |||  S )NzThe cached page is too small.)rF   r   rr   r$   r>   r   r;   r%   r%   r&   r   h  s
   zSAS7BDATReader._read_bytesr5   c                 C  s   |  | ||dS )N     )_convert_header_textr   rstripr   r%   r%   r&   _read_and_convert_header_texto  s   z,SAS7BDATReader._read_and_convert_header_textc                 C  sV   d}|s)| j | j| _t| jdkrd S t| j| jkr!td|  }|rd S d S )NFr   z2Failed to read a meta data page from the SAS file.)re   r   r   rF   r   r$   _process_page_meta)r>   doner%   r%   r&   rp   t  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|p+|p+| j	g kS r=   )
_read_page_headerr   page_meta_typespage_amd_typepage_mix_type_current_page_type_process_page_metadatapage_data_typerK   r]   )r>   ptis_data_page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 r=   )r   r   page_type_offsetr   page_type_lengthpage_type_mask2r   block_count_offsetblock_count_length_current_page_block_countsubheader_count_offsetsubheader_count_length_current_page_subheaders_count)r>   
bit_offset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sG|tjkrHq| 	|| j}	t
|	}
| j|
 }|d u r|tjdfv }|tjk}| jrx|rx|rx| j||f q|   td|	 ||| qd S )Nr   r   zUnknown subheader signature )r   ranger   r   subheader_pointers_offsetr   r   rE   truncated_subheader_idr   r   rn   compressed_subheader_idcompressed_subheader_typerS   r]   appendrr   r$   )r>   r   ir   total_offsetsubheader_offsetsubheader_lengthsubheader_compressionsubheader_typesubheader_signaturesubheader_index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   )rE   r   r   r   row_length_offset_multiplier
row_lengthrow_count_offset_multiplier	row_countcol_count_p1_multipliercol_count_p1col_count_p2_multipliercol_count_p2'row_count_on_mix_page_offset_multiplier_mix_page_row_count_lcs_lcp)r>   r   r;   int_len
lcs_offset
lcp_offsetmxr%   r%   r&   rf     s4   

z)SAS7BDATReader._process_rowsize_subheaderc                 C  sX   | j }||7 }| ||| _| j| j | jkr*td| j d| j d| j d d S d S )Nz Warning: column count mismatch (z + z != z)
)rE   r   column_countr   r   print)r>   r   r;   r   r%   r%   r&   rg     s   
z,SAS7BDATReader._process_columnsize_subheaderc                 C     d S r=   r%   r   r%   r%   r&   rh     s   z(SAS7BDATReader._process_subheader_countsc           	      C  s  || j 7 }| |tj}| ||}|d| d}| j| t| jdkrd}tj	D ]}||v r5|}q-|| _
|| j 8 }|d }| jrI|d7 }| || j}|d}|dkrwd| _|d }| jrg|d7 }| || j}|d| j | _nB|tjkr|d	 }| jr|d7 }| || j}|d| j | _n"| jdkrd| _|d }| jr|d7 }| || j}|d| j | _t| d
r| | j| _d S d S d S )Nr   r   r   rT      r           (   creator_proc)rE   r   r   text_block_size_lengthr   r   rY   r   r   compression_literalsrS   r   r   r   r  rle_compressionhasattrr   )	r>   r   r;   text_block_sizer   	cname_rawcompression_literalcloffset1r%   r%   r&   ri     sT   






"z,SAS7BDATReader._process_columntext_subheaderc                 C  s   | j }||7 }|d|  d d }t|D ]Q}|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      r   r   )rE   r   r   column_name_pointer_length!column_name_text_subheader_offsetcolumn_name_offset_offsetcolumn_name_length_offsetr   !column_name_text_subheader_lengthcolumn_name_offset_lengthcolumn_name_length_lengthrY   rZ   r   r   )r>   r   r;   r   column_name_pointers_countr   text_subheadercol_name_offsetcol_name_lengthidx
col_offsetcol_lenname_rawcnamer%   r%   r&   rj     sB   
z,SAS7BDATReader._process_columnname_subheaderc           
      C  s   | j }|d|  d |d  }t|D ]Y}|| tj ||d   }|d|  tj ||d   }|d|  tj ||d   }| ||}	| j|	 | |tj	}	| j
|	 | |tj}	| j|	dkridnd qd S )Nr   r  r   r      d   s)rE   r   r   column_data_offset_offsetcolumn_data_length_offsetcolumn_type_offsetr   r_   r   column_data_length_lengthr^   column_type_lengthr`   )
r>   r   r;   r   column_attributes_vectors_countr   col_data_offsetcol_data_len	col_typesr   r%   r%   r&   rk   =  s,   
z2SAS7BDATReader._process_columnattributes_subheaderc                 C  r  r=   r%   r   r%   r%   r&   rm   W  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   )rE   r   )column_format_text_subheader_index_offsetcolumn_format_offset_offsetcolumn_format_length_offset(column_label_text_subheader_index_offsetcolumn_label_offset_offsetcolumn_label_length_offsetr   )column_format_text_subheader_index_lengthminr   rY   column_format_offset_lengthcolumn_format_length_length(column_label_text_subheader_index_lengthcolumn_label_offset_lengthcolumn_label_length_lengthr   r\   r2   rZ   r`   r^   r[   r   )r>   r   r;   r   text_subheader_formatcol_format_offsetcol_format_lentext_subheader_labelcol_label_offsetcol_label_lenr   
format_idxformat_start
format_len	label_idxlabel_start	label_lenlabel_namescolumn_labelformat_namescolumn_formatcurrent_column_numbercolr%   r%   r&   rl   [  sX   


	z(SAS7BDATReader._process_format_subheaderr   c                 C  s   |d u r| j d ur| j }n|d u r| j}t| jdkr#|   td|dkr0| j| jkr0t 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rw|| j}|S )Nr   zNo columns to parse from filer!  r"  ru   r   )rM   r   r   r`   rr   r   ra   r   r4  countrw   r   object_string_chunkzerosuint8_byte_chunk_current_row_in_chunk_indexr   r   _chunk_to_dataframerW   	set_index)r>   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r3|   dt| jdd| jdd}t||   | j	t
jv rA|   | j	t
jt
jt
jg vrQ|  S dS )Nr   Tz-failed to read complete page from file (read r    z of z bytes)F)r]   re   r   r   rF   r   rr   r$   r   r   r   r   r   r   r   _read_next_page)r>   msgr%   r%   r&   rY    s,   
zSAS7BDATReader._read_next_pagec                 C  sj  | j }| j}t|| |}i }d\}}t| jD ]}| j| }| j| dkrl| j|d d f j| jd d}	t	j
|	tj|d||< | jrg| j| tjv rVt|| d||< n| j| tjv rgt|| d||< |d7 }q| j| dkrt	j
| j|d d f |d	||< | jr| jd ur| || j||< |d7 }q|   td
t| j|  t|| j|dd}
|
S )N)r   r   r!  r    ru   )rv   rW   r   r   r"  )rW   zunknown column type F)r\   rW   copy)rR  ra   r   r   rZ   r`   rQ  viewr   r"   r/   rw   float64rJ   r[   r   sas_date_formatsr1   sas_datetime_formatsrN  rQ   rO   _decode_stringr   rr   r$   reprr   )r>   nmixrX  jsjbjr6   col_arrdfr%   r%   r&   rS    s2   
 
 
z"SAS7BDATReader._chunk_to_dataframec                 C  s   | | jp| jS r=   )decoderO   rX   r>   br%   r%   r&   r`    s   zSAS7BDATReader._decode_stringrl  r9   c                 C  s   | j r| |S |S r=   )rR   r`  rk  r%   r%   r&   r     s   
z#SAS7BDATReader._convert_header_text)NTTNNTTrG   )rH   rI   rJ   rK   rL   rK   rM   rN   rO   rP   rQ   rK   rR   rK   rS   r   r*   r<   )r*   rs   )r*   r<   )r*   r   )r   r3   r   r3   )r   r3   r   r3   r*   r3   )r   r3   r;   r3   )r   r3   r;   r3   r*   r5   )r*   rK   )r   r3   r;   r3   r*   r<   r=   )r   rN   r*   r   )rl  r9   r*   r5   )!r@   rA   rB   __doc__rC   r?   r{   r}   r   rr   ro   r   r   r   r   r   rp   r   r   r   rf   rg   rh   ri   rj   rk   rm   rl   r   rY  rS  r`  r   r%   r%   r%   r&   rD      sP   
 
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



F









+



-
!

7
rD   )r   r   r   r   )r(   r)   r   r   r*   r)   )/rm  
__future__r   collectionsr   r   r   r   typingr   r   numpyrw   pandas._libs.byteswapr   r	   r
   r   r   pandas._libs.sasr   r   pandas.errorsr   r   pandasr"   r   r   pandas.io.commonr   pandas.io.sas.sas_constantsiosassas_constantsr   pandas.io.sas.sasreaderr   pandas._typingr   r   r   r'   r1   r2   IteratorrD   r%   r%   r%   r&   <module>   s*    

