Viewing file:  Precision.py (3.17 KB) -rw-r--r--
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""" A simple hack to start thinking about a better way to handle
specification of typecodes.
TODO:
The code_table should proably be cached somehow
Float/Complex needs to have precision and range specifiers
"""
from multiarray import zeros
import string
# dvhart - added the character 'u' for the UnisgnedInteger 'list of codes' ?
typecodes = {'Character':'c', 'Integer':'1sil', 'UnsignedInteger':'bwu', 'Float':'fd', 'Complex':'FD'}
def _get_precisions(typecodes):
lst = []
for t in typecodes:
lst.append( (zeros( (1,), t ).itemsize()*8, t) )
return lst
def _fill_table(typecodes, table={}):
for key, value in typecodes.items():
table[key] = _get_precisions(value)
return table
_code_table = _fill_table(typecodes)
class PrecisionError(Exception):
pass
def _lookup(table, key, required_bits):
lst = table[key]
for bits, typecode in lst:
if bits >= required_bits:
return typecode
raise PrecisionError, key+" of "+str(required_bits)+" bits not available on this system"
Character = 'c'
try:
UnsignedInt8 = _lookup(_code_table, "UnsignedInteger", 8)
UInt8 = UnsignedInt8
except(PrecisionError):
pass
try:
UnsignedInt16 = _lookup(_code_table, "UnsignedInteger", 16)
UInt16 = UnsignedInt16
except(PrecisionError):
pass
try:
UnsignedInt32 = _lookup(_code_table, "UnsignedInteger", 32)
UInt32 = UnsignedInt32
except(PrecisionError):
pass
try:
UnsignedInt64 = _lookup(_code_table, "UnsignedInteger", 64)
UInt64 = UnsignedInt64
except(PrecisionError):
pass
try:
UnsignedInt128 = _lookup(_code_table, "UnsignedInteger", 128)
UInt128 = UnsignedInt128
except(PrecisionError):
pass
UnsignedInteger = 'u'
UInt = UnsignedInteger
try: Int0 = _lookup(_code_table, 'Integer', 0)
except(PrecisionError): pass
try: Int8 = _lookup(_code_table, 'Integer', 8)
except(PrecisionError): pass
try: Int16 = _lookup(_code_table, 'Integer', 16)
except(PrecisionError): pass
try: Int32 = _lookup(_code_table, 'Integer', 32)
except(PrecisionError): pass
try: Int64 = _lookup(_code_table, 'Integer', 64)
except(PrecisionError): pass
try: Int128 = _lookup(_code_table, 'Integer', 128)
except(PrecisionError): pass
Int = 'l'
try: Float0 = _lookup(_code_table, 'Float', 0)
except(PrecisionError): pass
try: Float8 = _lookup(_code_table, 'Float', 8)
except(PrecisionError): pass
try: Float16 = _lookup(_code_table, 'Float', 16)
except(PrecisionError): pass
try: Float32 = _lookup(_code_table, 'Float', 32)
except(PrecisionError): pass
try: Float64 = _lookup(_code_table, 'Float', 64)
except(PrecisionError): pass
try: Float128 = _lookup(_code_table, 'Float', 128)
except(PrecisionError): pass
Float = 'd'
try: Complex0 = _lookup(_code_table, 'Complex', 0)
except(PrecisionError): pass
try: Complex8 = _lookup(_code_table, 'Complex', 16)
except(PrecisionError): pass
try: Complex16 = _lookup(_code_table, 'Complex', 32)
except(PrecisionError): pass
try: Complex32 = _lookup(_code_table, 'Complex', 64)
except(PrecisionError): pass
try: Complex64 = _lookup(_code_table, 'Complex', 128)
except(PrecisionError): pass
try: Complex128 = _lookup(_code_table, 'Complex', 256)
except(PrecisionError): pass
Complex = 'D'
PyObject = 'O'
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