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generators.py
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generators.py
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import csv
import datetime
import io
import sys
import struct
from django.contrib.sites.models import Site
from daiquiri import __version__ as daiquiri_version
from daiquiri.core.utils import get_doi_url
def generate_csv(generator, fields):
if sys.version_info.major >= 3:
io_class = io.StringIO
else:
io_class = io.BytesIO
# write header
f = io_class()
csv.writer(f, quotechar='"').writerow([field['name'] for field in fields])
yield f.getvalue()
for row in generator:
if row:
f = io_class()
csv.writer(f, quotechar='"').writerow(row)
yield f.getvalue()
def generate_votable(generator, fields, infos=[], links=[], table_name=None, empty=None):
yield '''<?xml version="1.0"?>
<VOTABLE version="1.3"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.ivoa.net/xml/VOTable/v1.3"
xmlns:stc="http://www.ivoa.net/xml/STC/v1.30">'''
yield '''
<RESOURCE type="results">'''
for info in infos:
yield '''
<INFO name="%(key)s" value="%(value)s" />''' % info
for link in links:
yield '''
<LINK title="%(title)s" content-role="%(content_role)s" href="%(href)s"/>''' % link
if table_name is not None:
yield '''
<TABLE name="%s">''' % table_name
else:
yield '''
<TABLE>'''
for field in fields:
attrs = []
for key in ['name', 'unit', 'ucd', 'utype']:
if key in field and field[key]:
value = field[key].replace('&', '&').replace('<', '<').replace('>', '>')
attrs.append('%s="%s"' % (key, value))
if 'arraysize' in field and field['arraysize']:
attrs.append('arraysize="%s"' % field['arraysize'])
if field['datatype'] in ['char', 'unsignedByte', 'short', 'int', 'long', 'float', 'double']:
attrs.append('datatype="%s"' % field['datatype'])
else:
attrs.append('xtype="%s"' % field['datatype'])
yield '''
<FIELD %s />''' % ' '.join(attrs)
if not empty:
yield '''
<DATA>
<TABLEDATA>'''
# write rows of the table yielded by the generator
for row in generator:
yield '''
<TR>
<TD>%s</TD>
</TR>''' % '''</TD>
<TD>'''.join([('' if cell == 'NULL' else str(cell)) for cell in row])
yield '''
</TABLEDATA>
</DATA>'''
yield '''
</TABLE>
</RESOURCE>
</VOTABLE>
'''
def generate_fits(generator, fields, nrows, table_name=None):
# VO format label, FITS format label, size, NULL value, encoded value
formats_dict = {
'unsignedByte': ('s', 'L', 1, b'\x00', lambda x: b'T' if x == 'true' else b'F'),
'short': ('h', 'I', 2, 32767, int),
'int': ('i', 'J', 4, 2147483647, int),
'long': ('q', 'K', 8, 9223372036854775807, int),
'float': ('f', 'E', 4, float('nan'), float),
'double': ('d', 'D', 8, float('nan'), float),
'char': ('s', 'A', 32, b'', lambda x: x.encode()),
'timestamp': ('s', 'A', 19, b'', lambda x: x.encode()),
'array': ('s', 'A', 64, b'', lambda x: x.encode()),
'spoint': ('s', 'A', 64, b'', lambda x: x.encode()),
'unknown': ('s', 'A', 8, b'', lambda x: x.encode())
}
names = [d['name'] for d in fields]
datatypes = [d['datatype'] for d in fields]
arraysizes = [d['arraysize'] if d['arraysize'] is not None else ''
for d in fields]
for i, d in enumerate(zip(datatypes, arraysizes)):
if d[0] == 'timestamp':
arraysizes[i] = formats_dict['timestamp'][2]
elif d[0] in ('char', 'spoint', 'array') and d[1] == '':
arraysizes[i] = formats_dict[d[0]][2]
elif d[0] is None:
datatypes[i] = 'unknown'
arraysizes[i] = formats_dict['unknown'][2]
units = []
ucds = []
for d in fields:
if 'unit' in d and d['unit'] is not None:
units.append(d['unit'])
else:
units.append('')
if 'ucd' in d and d['ucd'] is not None:
ucds.append(d['ucd'])
else:
ucds.append('')
naxis1 = sum([formats_dict[i[0]][2] if not i[1] else i[1]
for i in zip(datatypes, arraysizes)])
naxis2 = nrows
tfields = len(names)
site = str(Site.objects.get_current())[:30]
content = """
`,......`
:::.````````...
::``,:::,`.....``..`
,:.`,``,:::`....`````..
.:``:::,``,:`::```...``..
:,`::::::,`````,::::::`.:
:::::::::::::::::::::::::
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
,:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,............................
:,,,`````````...,,,,,,,,............................```
,,,.```````...,,,,,,,,............................`
`,,,``````....,,,,,,,...........................`
:+++,,,,,::::+++++++++++++++++++++++++++++++'
\\\\ created with django-daiquiri //
\\\\ v%s//
\\\\%s//
,,,.....,,,..................`
:++':;;;++++++++++++++++++'
,,,,,,,::::;;;;;;;;''''
,,,................
,,,............
,,.........`
`;;;;;;;:
,'` `''
:: ::
. .`
+++++++++: , , .,
+++ +++ '+' '+' ++.
+++ ,++: :'+'. `'+' ,'';'+ ;'+` .'+' `'+' .++,:+ ;++`
+++ `++; ++ ''; ;'; `'' `'' ''` ;'' ;'' ;++:, ++`
+++ ;++. :++'''' ;'; ;'' `'' ''` ;'' ;'' ;+' ++`
+++ `+++: .++ ''' ;'' .'' .'' '', ''' ;'' '+' ++`
+++++++: `'+'`+',,+++, ;+'.++ ;++: +'.,+++,,++++. ++++
`+++.
""".replace('\x0a', ' ') % (daiquiri_version.ljust(18),
(' ' * (15 - len(site) // 2) + site).ljust(30))
# Main header #############################################################
header0 = [i.ljust(80) for i in [
'SIMPLE = T / conforms to FITS standard',
'BITPIX = 8 / array data type',
'NAXIS = 1 / number of array dimensions',
'NAXIS1 = 2880 / number of characters',
'EXTEND = T',
'NTABLE = 1',
'END'
]]
h0 = ''.join(header0)
h0 += ' ' * (2880 * (len(h0) // 2880 + 1) - len(h0))
yield h0.encode()
# Main table content - required by some FITS viewers ######################
yield (content + '\x00' * (2880 - len(content))).encode()
# Table header ############################################################
header1 = [
"XTENSION= 'BINTABLE' / binary table extension".ljust(80),
'BITPIX = 8 / array data type'.ljust(80),
'NAXIS = 2 / number of array dimensions'.ljust(80),
'NAXIS1 = %20d / length of dimension 1'.ljust(64),
'NAXIS2 = %20d / length of dimension 2'.ljust(64),
'PCOUNT = 0 / number of group parameters'.ljust(80),
'GCOUNT = 1 / number of groups'.ljust(80),
'TFIELDS = %20d / number of table fields'.ljust(64),
]
if table_name is not None:
# table_name needs to be shorter than 68 chars
header1.append(("EXTNAME = '%s' / table name" %
str(table_name[:68])).ljust(80))
h1 = ''.join(header1) % (naxis1, naxis2, tfields)
ttype = ("TTYPE%s", "= '%s'")
tform = ("TFORM%s", "= '%s'")
tnull = ("TNULL%s", "= %s")
tunit = ("TUNIT%s", "= '%s'")
tucd = ("TUCD%s", "= '%s'")
for i, d in enumerate(zip(names, datatypes, arraysizes, units, ucds)):
temp = "".join(((ttype[0] % str(i + 1)).ljust(8),
ttype[1] % d[0][:68].ljust(8)))[:80].ljust(30)
temp += ' / label for column %d' % (i + 1)
temp = temp[:80]
temp += ' ' * (80 - len(temp))
h1 += temp
ff = (str(d[2]) + formats_dict[d[1]][1]).ljust(8)
temp = "".join(((tform[0] % str(i + 1)).ljust(8),
tform[1] % ff))[:80].ljust(31)
temp += '/ format for column %d' % (i + 1)
temp = temp[:80]
temp += ' ' * (80 - len(temp))
h1 += temp
# NULL values only for int-like types
if d[1] in ('short', 'int', 'long'):
temp = "".join(((tnull[0] % str(i + 1)).ljust(8),
tnull[1] % formats_dict[d[1]][3]))[:80].ljust(31)
temp += '/ blank value for column %d' % (i + 1)
temp = temp[:80]
temp += ' ' * (80 - len(temp))
h1 += temp
if d[3]:
temp = "".join(((tunit[0] % str(i + 1)).ljust(8),
tunit[1] % d[3][:68].ljust(8)))[:80].ljust(30)
temp += ' / unit for column %d' % (i + 1)
temp = temp[:80]
temp += ' ' * (80 - len(temp))
h1 += temp
if d[4]:
temp = "".join(((tucd[0] % str(i + 1)).ljust(8),
tucd[1] % d[4][:68].ljust(8)))[:80].ljust(30)
temp += ' / ucd for column %d' % (i + 1)
temp = temp[:80]
temp += ' ' * (80 - len(temp))
h1 += temp
now = datetime.datetime.utcnow().replace(microsecond=0).isoformat()
h1 += ("DATE-HDU= '%s' / UTC date of HDU creation" % now).ljust(80)
h1 += 'END'.ljust(80)
h1 += ' ' * (2880 * (len(h1) // 2880 + 1) - len(h1))
yield h1.encode()
# Data ####################################################################
fmt = '>' + ''.join([str(i[1]) + formats_dict[i[0]][0]
for i in zip(datatypes, arraysizes)])
row_count = 0
for row in generator:
r = [formats_dict[i[1]][3] if i[0] == 'NULL'
else formats_dict[i[1]][4](i[0]) for i in zip(row, datatypes)]
yield struct.pack(fmt, *r)
row_count += 1
# Footer padding (to fill the last block to 2880 bytes) ###################
ln = naxis1 * row_count
footer = '\x00' * (2880 * (ln // 2880 + 1) - ln)
yield footer.encode()