How to avoid redundancy between C ++ and boost :: python docs?

Question

I am adding a python module to C ++ code using boost :: python. The C ++ project is documented using doxygen. I want to create documentation for a python module, but I don't know how to not be redundant, like this:

#include <boost/python.hpp>
using namespace boost::python;

/** @brief Sum two integers
  * @param a an integer
  * @param b another integer
  * @return sum of integers
  */
int sum(int a, int b)
{
    return a+b;
}

BOOST_PYTHON_MODULE(pymodule)
{ 
    def("sum",&sum,args("a","b"),
        "Sum two integers.\n\n:param a: an integer\n:param b: another integer\n:returns: sum of integers");
};

Here I say the same thing in the docstring and doxygen comments. Any ideas?

Edit: A C ++ document is not publicly available, and the python interface is a subset of C ++.

Answer 1

I am a fan of code generation, and I think this is a reasonable situation to deploy it.

Doxygen DocStrings , , Python DocStrings.

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Doxygen DocString, , .

// DocString: sum
/**
 * @brief Sum two integers
 * @param a an integer
 * @param b another integer
 * @return sum of integers
 *
 */
int sum(int a, int b);

sum DocString.

Python, . .

BOOST_PYTHON_MODULE(pymodule)
{ 
  def("sum",&sum,args("a","b"), "@DocString(sum)");
};

Doxygen DocStrings Python.

, , , .

import re
import sys

def parse_doc_string(istr):
    pattern = re.compile(r'@(\w+)\s+(.*)')
    docstring = list()
    for line in map(lambda s : s.strip(), istr):
        if line == '/**':
            continue
        if line == '*/':
            return docstring
        line = line.lstrip('* ')
        match = pattern.match(line)
        if match:
            docstring.append((match.group(1), match.group(2)))

def extract(istr, docstrings):
    pattern = re.compile(r'^//\s*DocString:\s*(\w+)$')
    for line in map(lambda s : s.strip(), istr):
        match = pattern.match(line)
        if match:
            token = match.group(1)
            docstrings[token] = parse_doc_string(istr)

def format_doc_string(docstring):
    return '\n'.join('{}: {}'.format(k, v) for (k, v) in docstring)

def escape(string):
    return string.replace('\n', r'\n')

def substitute(istr, ostr, docstrings):
    pattern = re.compile(r'@DocString\((\w+)\)')
    for line in map(lambda s : s.rstrip(), istr):
        for match in pattern.finditer(line):
            token = match.group(1)
            docstring = format_doc_string(docstrings[token])
            line = line.replace(match.group(0), escape(docstring))
        print(line, file=ostr)

if __name__ == '__main__':
    sourcefile = sys.argv[1]
    docstrings = dict()
    with open(sourcefile) as istr:
        extract(istr, docstrings)
    with open(sourcefile) as istr:
        with sys.stdout as ostr:
            substitute(istr, ostr, docstrings)

script .

#include <boost/python.hpp>
using namespace boost::python;

// DocString: sum
/**
 * @brief Sum two integers
 * @param a an integer
 * @param b another integer
 * @return sum of integers
 *
 */
int sum(int a, int b)
{
  return a+b;
}

BOOST_PYTHON_MODULE(pymodule)
{
  def("sum",&sum,args("a","b"), "brief: Sum two integers\nparam: a an integer\nparam: b another integer\nreturn: sum of integers");
};

script, .

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Answer 2

5gon12eder , doxygen docstrings python. python script.

CMake script, . , :

set(FUNCTION "sum")
file(READ "pymodule.cpp.in" CONTENTS)

# To find the line with the flag
string(REGEX REPLACE "\n" ";" CONTENTS "${CONTENTS}")
list(FIND CONTENTS "// Docstring_${FUNCTION}" INDEX)

# To extract doxygen comments
math(EXPR INDEX "${INDEX}+1")
list(GET CONTENTS ${INDEX} LINE)
while(${LINE} MATCHES "@([a-z]+) (.*)")
  string(REGEX MATCH "@([a-z]+) (.*)" LINE "${LINE}")
  set(DOXY_COMMENTS ${DOXY_COMMENTS} ${LINE})
  math(EXPR INDEX "${INDEX}+1")
  list(GET CONTENTS ${INDEX} LINE)
endwhile()

# To convert doxygen comments into docstrings
foreach(LINE ${DOXY_COMMENTS})
  string(REGEX REPLACE "@brief " "" LINE "${LINE}")
  if("${LINE}" MATCHES "@param ([a-zA-Z0-9_]+) (.*)")
    set(LINE ":param ${CMAKE_MATCH_1}: ${CMAKE_MATCH_2}")
  endif()
  if ("${LINE}" MATCHES "@return (.+)")
    set(LINE ":returns: ${CMAKE_MATCH_1}")
  endif()
  set(DOCSTRING ${DOCSTRING} ${LINE})
endforeach()
string(REPLACE ";" "\\n" DOCSTRING "${DOCSTRING}")

# To insert docstrings in cpp file
set(Docstring_${FUNCTION} ${DOCSTRING})
configure_file("pymodule.cpp.in" "pymodule.cpp" @ONLY)

pymodule.cpp.in:

/**
 * @file pymodule.cpp
 */

#include<boost/python.hpp>
using namespace boost::python;

// Docstring_sum
/** @brief Sum two integers
  * @param a an integer
  * @param b another integer
  * @return sum of integers
  */
int sum(int a, int b) {
  return a+b;
}

BOOST_PYTHON_MODULE(pymodule){ 
  def("sum",&sum,args("a","b"),
      "@Docstring_sum@");
};

script pymodule.cpp docstring.