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import
re
__all__
=
[
"Style"
,
"MixedCaseUnderscoreStyle"
,
"DefaultStyle"
,
"MixedCaseStyle"
]
class
Style
(
object
):
"""
The base Style class, and also the simplest implementation. No
translation occurs -- column names and attribute names match,
as do class names and table names (when using auto class or
schema generation).
"""
def
__init__
(
self
,
pythonAttrToDBColumn
=
None
,
dbColumnToPythonAttr
=
None
,
pythonClassToDBTable
=
None
,
dbTableToPythonClass
=
None
,
idForTable
=
None
,
longID
=
False
):
if
pythonAttrToDBColumn
:
self
.
pythonAttrToDBColumn
=
\
lambda
a
,
s
=
self
:
pythonAttrToDBColumn
(
s
,
a
)
if
dbColumnToPythonAttr
:
self
.
dbColumnToPythonAttr
=
\
lambda
a
,
s
=
self
:
dbColumnToPythonAttr
(
s
,
a
)
if
pythonClassToDBTable
:
self
.
pythonClassToDBTable
=
\
lambda
a
,
s
=
self
:
pythonClassToDBTable
(
s
,
a
)
if
dbTableToPythonClass
:
self
.
dbTableToPythonClass
=
\
lambda
a
,
s
=
self
:
dbTableToPythonClass
(
s
,
a
)
if
idForTable
:
self
.
idForTable
=
lambda
a
,
s
=
self
:
idForTable
(
s
,
a
)
self
.
longID
=
longID
def
pythonAttrToDBColumn
(
self
,
attr
):
return
attr
def
dbColumnToPythonAttr
(
self
,
col
):
return
col
def
pythonClassToDBTable
(
self
,
className
):
return
className
def
dbTableToPythonClass
(
self
,
table
):
return
table
def
idForTable
(
self
,
table
):
if
self
.
longID
:
return
self
.
tableReference
(
table
)
else
:
return
'id'
def
pythonClassToAttr
(
self
,
className
):
return
lowerword
(
className
)
def
instanceAttrToIDAttr
(
self
,
attr
):
return
attr
+
"ID"
def
instanceIDAttrToAttr
(
self
,
attr
):
return
attr
[:
-
2
]
def
tableReference
(
self
,
table
):
return
table
+
"_id"
class
MixedCaseUnderscoreStyle
(
Style
):
"""
This is the default style. Python attributes use mixedCase,
while database columns use underscore_separated.
"""
def
pythonAttrToDBColumn
(
self
,
attr
):
return
mixedToUnder
(
attr
)
def
dbColumnToPythonAttr
(
self
,
col
):
return
underToMixed
(
col
)
def
pythonClassToDBTable
(
self
,
className
):
return
className
[
0
].
lower
() \
+
mixedToUnder
(
className
[
1
:])
def
dbTableToPythonClass
(
self
,
table
):
return
table
[
0
].
upper
() \
+
underToMixed
(
table
[
1
:])
def
pythonClassToDBTableReference
(
self
,
className
):
return
self
.
tableReference
(
self
.
pythonClassToDBTable
(
className
))
def
tableReference
(
self
,
table
):
return
table
+
"_id"
DefaultStyle
=
MixedCaseUnderscoreStyle
class
MixedCaseStyle
(
Style
):
"""
This style leaves columns as mixed-case, and uses long
ID names (like ProductID instead of simply id).
"""
def
pythonAttrToDBColumn
(
self
,
attr
):
return
capword
(
attr
)
def
dbColumnToPythonAttr
(
self
,
col
):
return
lowerword
(
col
)
def
dbTableToPythonClass
(
self
,
table
):
return
capword
(
table
)
def
tableReference
(
self
,
table
):
return
table
+
"ID"
defaultStyle
=
DefaultStyle
()
def
getStyle
(
soClass
,
dbConnection
=
None
):
if
dbConnection
is
None
:
if
hasattr
(
soClass
,
'_connection'
):
dbConnection
=
soClass
.
_connection
if
hasattr
(
soClass
.
sqlmeta
,
'style'
)
and
soClass
.
sqlmeta
.
style
:
return
soClass
.
sqlmeta
.
style
elif
dbConnection
and
dbConnection
.
style
:
return
dbConnection
.
style
else
:
return
defaultStyle
############################################################
# Text utilities
############################################################
_mixedToUnderRE
=
re
.
compile
(
r'[A-Z]+'
)
def
mixedToUnder
(
s
):
if
s
.
endswith
(
'ID'
):
return
mixedToUnder
(
s
[:
-
2
]
+
"_id"
)
trans
=
_mixedToUnderRE
.
sub
(
mixedToUnderSub
,
s
)
if
trans
.
startswith
(
'_'
):
trans
=
trans
[
1
:]
return
trans
def
mixedToUnderSub
(
match
):
m
=
match
.
group
(
0
).
lower
()
if
len
(
m
)
>
1
:
return
'_%s_%s'
%
(
m
[:
-
1
],
m
[
-
1
])
else
:
return
'_%s'
%
m
def
capword
(
s
):
return
s
[
0
].
upper
()
+
s
[
1
:]
def
lowerword
(
s
):
return
s
[
0
].
lower
()
+
s
[
1
:]
_underToMixedRE
=
re
.
compile
(
'_.'
)
def
underToMixed
(
name
):
if
name
.
endswith
(
'_id'
):
return
underToMixed
(
name
[:
-
3
]
+
"ID"
)
return
_underToMixedRE
.
sub
(
lambda
m
:
m
.
group
(
0
)[
1
].
upper
(),
name
)
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