psycopg2/scripts/buildtypes.py

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# -*- python -*-
#
# Copyright (C) 2001-2003 Federico Di Gregorio <fog@debian.org>
#
# This file is part of the psycopg module.
#
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# psycopg2 is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
# License for more details.
#
# this a little script that analyze a file with (TYPE, NUMBER) tuples
# and write out C code ready for inclusion in psycopg. the generated
# code defines the DBAPITypeObject fundamental types and warns for
# undefined types.
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import sys
from string import split, strip
# here is the list of the foundamental types we want to import from
# postgresql header files
basic_types = (['NUMBER', ['INT8', 'INT4', 'INT2', 'FLOAT8', 'FLOAT4',
'NUMERIC']],
['LONGINTEGER', ['INT8']],
['INTEGER', ['INT4', 'INT2']],
['FLOAT', ['FLOAT8', 'FLOAT4']],
['DECIMAL', ['NUMERIC']],
['UNICODE', ['NAME', 'CHAR', 'TEXT', 'BPCHAR',
'VARCHAR']],
['STRING', ['NAME', 'CHAR', 'TEXT', 'BPCHAR',
'VARCHAR']],
['BOOLEAN', ['BOOL']],
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['DATETIME', ['TIMESTAMP', 'TIMESTAMPTZ',
'TINTERVAL', 'INTERVAL']],
['TIME', ['TIME', 'TIMETZ']],
['DATE', ['DATE']],
['INTERVAL', ['TINTERVAL', 'INTERVAL']],
['BINARY', ['BYTEA']],
['ROWID', ['OID']])
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# unfortunately we don't have a nice way to extract array information
# from postgresql headers; we'll have to do it hard-coding :/
array_types = (['LONGINTEGER', [1016]],
['INTEGER', [1005, 1006, 1007]],
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['FLOAT', [1017, 1021, 1022]],
['DECIMAL', [1231]],
['UNICODE', [1002, 1003, 1009, 1014, 1015]],
['STRING', [1002, 1003, 1009, 1014, 1015]],
['BOOLEAN', [1000]],
['DATETIME', [1115, 1185]],
['TIME', [1183, 1270]],
['DATE', [1182]],
['INTERVAL', [1187]],
['BINARY', [1001]],
['ROWID', [1028, 1013]])
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# this is the header used to compile the data in the C module
HEADER = """
typecastObject_initlist typecast_builtins[] = {
"""
# then comes the footer
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FOOTER = """ {NULL, NULL, NULL, NULL}\n};\n"""
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# useful error reporting function
def error(msg):
"""Report an error on stderr."""
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sys.stderr.write(msg + '\n')
# read couples from stdin and build list
read_types = []
for l in sys.stdin.readlines():
oid, val = split(l)
read_types.append((strip(oid)[:-3], strip(val)))
# look for the wanted types in the read touples
found_types = {}
for t in basic_types:
k = t[0]
found_types[k] = []
for v in t[1]:
found = filter(lambda x, y=v: x[0] == y, read_types)
if len(found) == 0:
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error(v + ': value not found')
elif len(found) > 1:
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error(v + ': too many values')
else:
found_types[k].append(int(found[0][1]))
# now outputs to stdout the right C-style definitions
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stypes = sstruct = ""
for t in basic_types:
k = t[0]
s = str(found_types[k])
s = '{' + s[1:-1] + ', 0}'
stypes = stypes + ('static long int typecast_%s_types[] = %s;\n' % (k, s))
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sstruct += (' {"%s", typecast_%s_types, typecast_%s_cast, NULL},\n'
% (k, k, k))
for t in array_types:
kt = t[0]
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ka = t[0] + 'ARRAY'
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s = str(t[1])
s = '{' + s[1:-1] + ', 0}'
stypes = stypes + ('static long int typecast_%s_types[] = %s;\n' % (ka, s))
sstruct += (' {"%s", typecast_%s_types, typecast_%s_cast, "%s"},\n'
% (ka, ka, ka, kt))
sstruct = HEADER + sstruct + FOOTER
print stypes
print sstruct