#!/usr/bin/env python
"""Doxygen XML to SWIG docstring converter.

Converts Doxygen generated XML files into a file containing docstrings
that can be used by SWIG >1.3.23

Usage:

  extract-docstrings.py input_py_wrapper.py input_xml_dir output_directory

input_py_wrapper.py is a swig generated file, with/without docstrings,
                    so we can get to know which classes are inspected by swig

input_xml_dir is your doxygen generated XML directory

output_directory is the directory where output will be written

"""

# This code is implemented using Mark Pilgrim's code as a guideline:
#   http://www.faqs.org/docs/diveintopython/kgp_divein.html
# Based in doxy2swig.py
# Author: Prabhu Ramachandran
# License: BSD style

from __future__ import print_function

from xml.dom import minidom
import re
import textwrap
import sys
import os.path


def my_open_read(source):
    if hasattr(source, "read"):
        return source
    else:
        return open(source)

def my_open_write(dest):
    if hasattr(dest, "write"):
        return dest
    else:
        return open(dest, 'w')


class Doxy2SWIG:
    """Converts Doxygen generated XML files into a file containing
    docstrings that can be used by SWIG-1.3.x that have support for
    feature("docstring").  Once the data is parsed it is stored in
    self.pieces.

    """

    def __init__(self, src):
        """Initialize the instance given a source object (file or
        filename).

        """
        f = my_open_read(src)
        self.my_dir = os.path.dirname(f.name)
        self.xmldoc = minidom.parse(f).documentElement
        f.close()

        self.pieces = []
        self.pieces.append('\n// File: %s\n'%\
                           os.path.basename(f.name))

        self.space_re = re.compile(r'\s+')
        self.lead_spc = re.compile(r'^(%feature\S+\s+\S+\s*?)"\s+(\S)')
        self.multi = 0
        self.ignores = ('inheritancegraph', 'param', 'listofallmembers',
                        'innerclass', 'name', 'declname', 'incdepgraph',
                        'invincdepgraph', 'programlisting', 'type',
                        'references', 'referencedby', 'location',
                        'collaborationgraph', 'reimplements',
                        'reimplementedby', 'derivedcompoundref',
                        'basecompoundref')
        #self.generics = []

    def generate(self):
        """Parses the file set in the initialization.  The resulting
        data is stored in `self.pieces`.

        """
        self.parse(self.xmldoc)

    def parse(self, node):
        """Parse a given node.  This function in turn calls the
        `parse_<nodeType>` functions which handle the respective
        nodes.

        """
        pm = getattr(self, "parse_%s"%node.__class__.__name__)
        pm(node)

    def parse_Document(self, node):
        self.parse(node.documentElement)

    def parse_Text(self, node):
        txt = node.data
        txt = txt.replace('\\', r'\\\\')
        txt = txt.replace('"', r'\"')
        # ignore pure whitespace
        m = self.space_re.match(txt)
        if m and len(m.group()) == len(txt):
            pass
        else:
            self.add_text(textwrap.fill(txt))

    def parse_Element(self, node):
        """Parse an `ELEMENT_NODE`.  This calls specific
        `do_<tagName>` handers for different elements.  If no handler
        is available the `generic_parse` method is called.  All
        tagNames specified in `self.ignores` are simply ignored.

        """
        name = node.tagName
        ignores = self.ignores
        if name in ignores:
            return
        attr = "do_%s" % name
        if hasattr(self, attr):
            handlerMethod = getattr(self, attr)
            handlerMethod(node)
        else:
            self.generic_parse(node)
            #if name not in self.generics: self.generics.append(name)

    def add_text(self, value):
        """Adds text corresponding to `value` into `self.pieces`."""
        if type(value) in (list, tuple):
            self.pieces.extend(value)
        else:
            self.pieces.append(value)

    def get_specific_nodes(self, node, names):
        """Given a node and a sequence of strings in `names`, return a
        dictionary containing the names as keys and child
        `ELEMENT_NODEs`, that have a `tagName` equal to the name.

        """
        nodes = [(x.tagName, x) for x in node.childNodes \
                 if x.nodeType == x.ELEMENT_NODE and \
                 x.tagName in names]
        return dict(nodes)

    def generic_parse(self, node, pad=0):
        """A Generic parser for arbitrary tags in a node.

        Parameters:

         - node:  A node in the DOM.
         - pad: `int` (default: 0)

           If 0 the node data is not padded with newlines.  If 1 it
           appends a newline after parsing the childNodes.  If 2 it
           pads before and after the nodes are processed.  Defaults to
           0.

        """
        npiece = 0
        if pad:
            npiece = len(self.pieces)
            if pad == 2:
                self.add_text('\n')
        for n in node.childNodes:
            self.parse(n)
        if pad:
            if len(self.pieces) > npiece:
                self.add_text('\n')

    def space_parse(self, node):
        self.add_text(' ')
        self.generic_parse(node)

    do_ref = space_parse
    do_emphasis = space_parse
    do_bold = space_parse
    do_computeroutput = space_parse
    do_formula = space_parse

    def do_compoundname(self, node):
        self.add_text('\n\n')
        data = node.firstChild.data
        self.add_text('%%feature("docstring") %s "\n'%data)

    def do_compounddef(self, node):
        kind = node.attributes['kind'].value
        if kind in ('class', 'struct'):
            prot = node.attributes['prot'].value
            if prot != 'public':
                return
            names = ('compoundname', 'briefdescription',
                     'detaileddescription', 'includes')
            first = self.get_specific_nodes(node, names)
            for n in names:
                if n in first:
                    self.parse(first[n])
            self.add_text(['";','\n'])
            for n in node.childNodes:
                if n not in first.values():
                    self.parse(n)
        elif kind in ('file', 'namespace'):
            nodes = node.getElementsByTagName('sectiondef')
            for n in nodes:
                self.parse(n)

    def do_includes(self, node):
        self.add_text('C++ includes: ')
        self.generic_parse(node, pad=1)

    def do_parameterlist(self, node):
        self.add_text(['\n', '\n', 'Parameters:', '\n'])
        self.generic_parse(node, pad=1)

    def do_para(self, node):
        self.add_text('\n')
        self.generic_parse(node, pad=1)

    def do_parametername(self, node):
        self.add_text('\n')
        try:
            self.add_text("%s: "%node.firstChild.data)
        except AttributeError:
            self.add_text("???: ")

    def do_parameterdefinition(self, node):
        self.generic_parse(node, pad=1)

    def do_detaileddescription(self, node):
        self.generic_parse(node, pad=1)

    def do_briefdescription(self, node):
        self.generic_parse(node, pad=1)

    def do_memberdef(self, node):
        prot = node.attributes['prot'].value
        id = node.attributes['id'].value
        kind = node.attributes['kind'].value
        tmp = node.parentNode.parentNode.parentNode
        compdef = tmp.getElementsByTagName('compounddef')[0]
        cdef_kind = compdef.attributes['kind'].value

        if prot == 'public':
            first = self.get_specific_nodes(node, ('definition', 'name'))
            name = first['name'].firstChild.data
            if name[:8] == 'operator': # Don't handle operators yet.
                return

            defn = first['definition'].firstChild.data
            self.add_text('\n')
            self.add_text('%feature("docstring") ')

            anc = node.parentNode.parentNode
            if cdef_kind in ('file', 'namespace'):
                ns_node = anc.getElementsByTagName('innernamespace')
                if not ns_node and cdef_kind == 'namespace':
                    ns_node = anc.getElementsByTagName('compoundname')
                if ns_node:
                    ns = ns_node[0].firstChild.data
                    self.add_text(' %s::%s "\n%s'%(ns, name, defn))
                else:
                    self.add_text(' %s "\n%s'%(name, defn))
            elif cdef_kind in ('class', 'struct'):
                # Get the full function name.
                anc_node = anc.getElementsByTagName('compoundname')
                cname = anc_node[0].firstChild.data
                self.add_text(' %s::%s "\n%s'%(cname, name, defn))


            for n in node.childNodes:
                if n not in first.values():
                    self.parse(n)
            self.add_text(['";', '\n'])

    def do_definition(self, node):
        data = node.firstChild.data
        self.add_text('%s "\n%s'%(data, data))

    def do_sectiondef(self, node):
        kind = node.attributes['kind'].value
        if kind in ('public-func', 'func'):
            self.generic_parse(node)

    def do_simplesect(self, node):
        kind = node.attributes['kind'].value
        if kind in ('date', 'rcs', 'version'):
            pass
        elif kind == 'warning':
            self.add_text(['\n', 'WARNING: '])
            self.generic_parse(node)
        elif kind == 'see':
            self.add_text('\n')
            self.add_text('See: ')
            self.generic_parse(node)
        else:
            self.generic_parse(node)

    def do_argsstring(self, node):
        self.generic_parse(node, pad=1)

    def do_member(self, node):
        kind = node.attributes['kind'].value
        refid = node.attributes['refid'].value
        if kind == 'function' and refid[:9] == 'namespace':
            self.generic_parse(node)

    def do_doxygenindex(self, node):
        self.multi = 1
        comps = node.getElementsByTagName('compound')
        for c in comps:
            refid = c.attributes['refid'].value
            fname = refid + '.xml'
            if not os.path.exists(fname):
                fname = os.path.join(self.my_dir,  fname)
            print("parsing file: %s" % fname)
            p = Doxy2SWIG(fname)
            p.generate()
            self.pieces.extend(self.clean_pieces(p.pieces))

    def write(self, fname):
        o = my_open_write(fname)
        if self.multi:
            o.write("".join(self.pieces))
        else:
            o.write("".join(self.clean_pieces(self.pieces)))
        o.close()

    def clean_pieces(self, pieces):
        """Cleans the list of strings given as `pieces`.  It replaces
        multiple newlines by a maximum of 2 and returns a new list.
        It also wraps the paragraphs nicely.

        """
        ret = []
        count = 0
        for i in pieces:
            if i == '\n':
                count = count + 1
            else:
                if i == '";':
                    if count:
                        ret.append('\n')
                elif count > 2:
                    ret.append('\n\n')
                elif count:
                    ret.append('\n'*count)
                count = 0
                ret.append(i)

        _data = "".join(ret)
        ret = []
        for i in _data.split('\n\n'):
            if i == 'Parameters:':
                ret.extend(['Parameters:\n-----------', '\n\n'])
            elif i.find('// File:') > -1: # leave comments alone.
                ret.extend([i, '\n'])
            else:
                _tmp = textwrap.fill(i.strip())
                _tmp = self.lead_spc.sub(r'\1"\2', _tmp)
                ret.extend([_tmp, '\n\n'])
        return ret


def get_python_classes(input_py):
    with open(input_py) as f:
        data = f.read()
        classes_supers = re.findall(r'class[ ]+([\w_]+)(\([\w_, ]+\))?:',data)
        classes = (classname for classname,superclass in classes_supers)
        return classes
    return []

def main(input_py, input_xml, output_dir):

    classes = get_python_classes(input_py)

    with open("%s/docstrings.i"%output_dir,'w') as f_index:

        for classname in classes:


            class_file = "%s/class%s.xml"%(input_xml,classname.replace("_","__"))
            swig_file = "%s/%s.i"%(output_dir,classname.lower())

            if os.path.isfile(class_file):
                print("processing:", class_file, " ->", swig_file)
                p = Doxy2SWIG(class_file)
                p.generate()
                p.write(swig_file)
                f_index.write('%%include "%s.i"\n'% classname.lower())
            #else:
            #    print("ignoring class %s, as %s does not exist" % (classname,class_file))





if __name__ == '__main__':
    print(sys.argv)
    if len(sys.argv) != 4:
        print(__doc__)
        sys.exit(1)
    main(sys.argv[1], sys.argv[2], sys.argv[3])
