Re: Read C++ enum in python
pygccxml http://www.language-binding.net/pygccxml/pygccxml.html It uses gccxml to compile your source code into xml, and then makes all of your source code available to you via a high level and convenient query interface in python. On Tue, Aug 18, 2009 at 5:03 PM, Ludo < olivier.anospamrnospamnnospamanospamenosp...@affaires.net> wrote: > Hello, > > I work in a very large project where we have C++ packages and pieces of > python code. > > I've been googleing for days but what I find seems really too complicated > for what I want to do. > > My business is, in python, to read enum definitions provided by the header > file of an c++ package. > Of course I could open the .h file, read the enum and transcode it by hand > into a .py file but the package is regularly updated and thus is the enum. > > My question is then simple : do we have : >- either a simple way in python to read the .h file, retrieve the > c++ enum and provide an access to it in my python script >- either a simple tool (in a long-term it would be automatically run > when the c++ package is compiled) generating from the .h file a .py file > containing the python definition of the enums ? > > Thank you for any suggestion. > -- > http://mail.python.org/mailman/listinfo/python-list > -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
"Mark Tolonen" wrote in message
news:h6g9ig$vh...@ger.gmane.org...
[snip]
This is what 3rd party library pyparsing is great for:
begin code--
from pyparsing import *
# sample string with enums and other stuff
sample = '''
stuff before
enum hello {
Zero,
One,
Two,
Three,
Five=5,
Six,
Ten=10
}
in the middle
enum blah
{
alpha,
beta,
gamma = 10 ,
zeta = 50
}
at the end
'''
# syntax we don't want to see in the final parse tree
_lcurl = Suppress('{')
_rcurl = Suppress('}')
_equal = Suppress('=')
_comma = Suppress(',')
_enum = Suppress('enum')
identifier = Word(alphas,alphanums+'_')
integer = Word(nums)
enumValue = Group(identifier('name') + Optional(_equal +
integer('value')))
enumList = Group(enumValue + ZeroOrMore(_comma + enumValue))
enum = _enum + identifier('enum') + _lcurl + enumList('list') + _rcurl
# find instances of enums ignoring other syntax
for item,start,stop in enum.scanString(sample):
id = 0
for entry in item.list:
if entry.value != '':
id = int(entry.value)
print '%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id)
id += 1
--end code
Output:
HELLO_ZERO = 0
HELLO_ONE = 1
HELLO_TWO = 2
HELLO_THREE = 3
HELLO_FIVE = 5
HELLO_SIX = 6
HELLO_TEN = 10
BLAH_ALPHA = 0
BLAH_BETA = 1
BLAH_GAMMA = 10
BLAH_ZETA = 50
Paul McGuire (pyparsing author) reminded me that:
enum.ignore(cppStyleComment)
before scanString will skip commented out sections as well.
-Mark
--
http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
Neil Hodgson a écrit : For some headers I tried it didn't work until the .* was changed to a non-greedy .*? to avoid removing from the start of the first comment to the end of the last comment. file_data = ' '.join(re.split(r'\/\*.*?\*\/', file_data)) Thank you ! I adopt it ! Cheers. -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
"Mark Tolonen" wrote in message
news:mailman.89.1250666942.2854.python-l...@python.org...
>
> "MRAB" wrote in message
> news:4a8b3e2d.7040...@mrabarnett.plus.com...
>> Ludo wrote:
>>> Hello,
>>>
>>> I work in a very large project where we have C++ packages and pieces of
>>> python code.
>>>
>>> I've been googleing for days but what I find seems really too
>>> complicated for what I want to do.
>>>
>>> My business is, in python, to read enum definitions provided by the
>>> header file of an c++ package.
>>> Of course I could open the .h file, read the enum and transcode it by
>>> hand into a .py file but the package is regularly updated and thus is
>>> the enum.
>>>
>>> My question is then simple : do we have :
>>> - either a simple way in python to read the .h file, retrieve the
>>> c++ enum and provide an access to it in my python script
>>> - either a simple tool (in a long-term it would be automatically run
>>> when the c++ package is compiled) generating from the .h file a .py file
>>> containing the python definition of the enums ?
>>>
>>> Thank you for any suggestion.
>>
>> Speaking personally, I'd parse the .h file using a regular expression
>> (re module) and generate a .py file. Compilers typically have a way of
>> letting you run external scripts (eg batch files in Windows or, in this
>> case, a Python script) when an application is compiled.
>
> This is what 3rd party library pyparsing is great for:
>
> begin code--
> from pyparsing import *
>
> # sample string with enums and other stuff
> sample = '''
>stuff before
>
>enum hello {
>Zero,
>One,
>Two,
>Three,
>Five=5,
>Six,
>Ten=10
>}
>
>in the middle
>
>enum blah
>{
>alpha,
>beta,
>gamma = 10 ,
>zeta = 50
>}
>
>at the end
>'''
>
> # syntax we don't want to see in the final parse tree
> _lcurl = Suppress('{')
> _rcurl = Suppress('}')
> _equal = Suppress('=')
> _comma = Suppress(',')
> _enum = Suppress('enum')
>
> identifier = Word(alphas,alphanums+'_')
> integer = Word(nums)
>
> enumValue = Group(identifier('name') + Optional(_equal +
> integer('value')))
> enumList = Group(enumValue + ZeroOrMore(_comma + enumValue))
> enum = _enum + identifier('enum') + _lcurl + enumList('list') + _rcurl
>
> # find instances of enums ignoring other syntax
> for item,start,stop in enum.scanString(sample):
>id = 0
>for entry in item.list:
>if entry.value != '':
>id = int(entry.value)
>print '%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id)
>id += 1
> --end code
>
> Output:
> HELLO_ZERO = 0
> HELLO_ONE = 1
> HELLO_TWO = 2
> HELLO_THREE = 3
> HELLO_FIVE = 5
> HELLO_SIX = 6
> HELLO_TEN = 10
> BLAH_ALPHA = 0
> BLAH_BETA = 1
> BLAH_GAMMA = 10
> BLAH_ZETA = 50
>
> -Mark
>
>
Python and pythoneers are amazing!
--
http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
AggieDan04:
> file_data = open(filename).read()
> # Remove comments and preprocessor directives
> file_data = ' '.join(line.split('//')[0].split('#')[0] for line in
> file_data.splitlines())
> file_data = ' '.join(re.split(r'\/\*.*\*\/', file_data))
For some headers I tried it didn't work until the .* was changed to a
non-greedy .*? to avoid removing from the start of the first comment to
the end of the last comment.
file_data = ' '.join(re.split(r'\/\*.*?\*\/', file_data))
Neil
--
http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
"MRAB" wrote in message
news:4a8b3e2d.7040...@mrabarnett.plus.com...
Ludo wrote:
Hello,
I work in a very large project where we have C++ packages and pieces of
python code.
I've been googleing for days but what I find seems really too complicated
for what I want to do.
My business is, in python, to read enum definitions provided by the
header file of an c++ package.
Of course I could open the .h file, read the enum and transcode it by
hand into a .py file but the package is regularly updated and thus is the
enum.
My question is then simple : do we have :
- either a simple way in python to read the .h file, retrieve the c++
enum and provide an access to it in my python script
- either a simple tool (in a long-term it would be automatically run
when the c++ package is compiled) generating from the .h file a .py file
containing the python definition of the enums ?
Thank you for any suggestion.
Speaking personally, I'd parse the .h file using a regular expression
(re module) and generate a .py file. Compilers typically have a way of
letting you run external scripts (eg batch files in Windows or, in this
case, a Python script) when an application is compiled.
This is what 3rd party library pyparsing is great for:
begin code--
from pyparsing import *
# sample string with enums and other stuff
sample = '''
stuff before
enum hello {
Zero,
One,
Two,
Three,
Five=5,
Six,
Ten=10
}
in the middle
enum blah
{
alpha,
beta,
gamma = 10 ,
zeta = 50
}
at the end
'''
# syntax we don't want to see in the final parse tree
_lcurl = Suppress('{')
_rcurl = Suppress('}')
_equal = Suppress('=')
_comma = Suppress(',')
_enum = Suppress('enum')
identifier = Word(alphas,alphanums+'_')
integer = Word(nums)
enumValue = Group(identifier('name') + Optional(_equal + integer('value')))
enumList = Group(enumValue + ZeroOrMore(_comma + enumValue))
enum = _enum + identifier('enum') + _lcurl + enumList('list') + _rcurl
# find instances of enums ignoring other syntax
for item,start,stop in enum.scanString(sample):
id = 0
for entry in item.list:
if entry.value != '':
id = int(entry.value)
print '%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id)
id += 1
--end code
Output:
HELLO_ZERO = 0
HELLO_ONE = 1
HELLO_TWO = 2
HELLO_THREE = 3
HELLO_FIVE = 5
HELLO_SIX = 6
HELLO_TEN = 10
BLAH_ALPHA = 0
BLAH_BETA = 1
BLAH_GAMMA = 10
BLAH_ZETA = 50
-Mark
--
http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
On Aug 18, 6:03 pm, Ludo
wrote:
> Hello,
>
> I work in a very large project where we have C++ packages and pieces of
> python code.
>
> I've been googleing for days but what I find seems really too
> complicated for what I want to do.
>
> My business is, in python, to read enum definitions provided by the
> header file of an c++ package.
> Of course I could open the .h file, read the enum and transcode it by
> hand into a .py file but the package is regularly updated and thus is
> the enum.
>
> My question is then simple : do we have :
> - either a simple way in python to read the .h file, retrieve the c++
> enum and provide an access to it in my python script
Try something like this:
file_data = open(filename).read()
# Remove comments and preprocessor directives
file_data = ' '.join(line.split('//')[0].split('#')[0] for line in
file_data.splitlines())
file_data = ' '.join(re.split(r'\/\*.*\*\/', file_data))
# Look for enums: In the first { } block after the keyword "enum"
enums = [text.split('{')[1].split('}')[0] for text in re.split(r'\benum
\b', file_data)[1:]]
for enum in enums:
last_value = -1
for enum_name in enum.split(','):
if '=' in enum_name:
enum_name, enum_value = enum_name.split('=')
enum_value = int(enum_value, 0)
else:
enum_value = last_value + 1
last_value = enum_value
enum_name = enum_name.strip()
print '%s = %d' % (enum_name, enum_value)
print
--
http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
Ludo wrote: Hello, I work in a very large project where we have C++ packages and pieces of python code. I've been googleing for days but what I find seems really too complicated for what I want to do. My business is, in python, to read enum definitions provided by the header file of an c++ package. Of course I could open the .h file, read the enum and transcode it by hand into a .py file but the package is regularly updated and thus is the enum. My question is then simple : do we have : - either a simple way in python to read the .h file, retrieve the c++ enum and provide an access to it in my python script - either a simple tool (in a long-term it would be automatically run when the c++ package is compiled) generating from the .h file a .py file containing the python definition of the enums ? Thank you for any suggestion. Speaking personally, I'd parse the .h file using a regular expression (re module) and generate a .py file. Compilers typically have a way of letting you run external scripts (eg batch files in Windows or, in this case, a Python script) when an application is compiled. -- http://mail.python.org/mailman/listinfo/python-list
