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#!/usr/bin/env python3
"""

Build call-back mechanism for f2py2e.

Copyright 2000 Pearu Peterson all rights reserved,
Pearu Peterson <pearu@ioc.ee>
Permission to use, modify, and distribute this software is given under the
terms of the NumPy License.

NO WARRANTY IS EXPRESSED OR IMPLIED.  USE AT YOUR OWN RISK.
$Date: 2005/07/20 11:27:58 $
Pearu Peterson

"""
from . import __version__
from .auxfuncs import (
    applyrules, debugcapi, dictappend, errmess, getargs, hasnote, isarray,
    iscomplex, iscomplexarray, iscomplexfunction, isfunction, isintent_c,
    isintent_hide, isintent_in, isintent_inout, isintent_nothide,
    isintent_out, isoptional, isrequired, isscalar, isstring,
    isstringfunction, issubroutine, l_and, l_not, l_or, outmess, replace,
    stripcomma, throw_error
)
from . import cfuncs

f2py_version = __version__.version


################## Rules for callback function ##############

cb_routine_rules = {
    'cbtypedefs': 'typedef #rctype#(*#name#_typedef)(#optargs_td##args_td##strarglens_td##noargs#);',
    'body': """
#begintitle#
typedef struct {
    PyObject *capi;
    PyTupleObject *args_capi;
    int nofargs;
    jmp_buf jmpbuf;
} #name#_t;

#if defined(F2PY_THREAD_LOCAL_DECL) && !defined(F2PY_USE_PYTHON_TLS)

static F2PY_THREAD_LOCAL_DECL #name#_t *_active_#name# = NULL;

static #name#_t *swap_active_#name#(#name#_t *ptr) {
    #name#_t *prev = _active_#name#;
    _active_#name# = ptr;
    return prev;
}

static #name#_t *get_active_#name#(void) {
    return _active_#name#;
}

#else

static #name#_t *swap_active_#name#(#name#_t *ptr) {
    char *key = "__f2py_cb_#name#";
    return (#name#_t *)F2PySwapThreadLocalCallbackPtr(key, ptr);
}

static #name#_t *get_active_#name#(void) {
    char *key = "__f2py_cb_#name#";
    return (#name#_t *)F2PyGetThreadLocalCallbackPtr(key);
}

#endif

/*typedef #rctype#(*#name#_typedef)(#optargs_td##args_td##strarglens_td##noargs#);*/
#static# #rctype# #callbackname# (#optargs##args##strarglens##noargs#) {
    #name#_t cb_local = { NULL, NULL, 0 };
    #name#_t *cb = NULL;
    PyTupleObject *capi_arglist = NULL;
    PyObject *capi_return = NULL;
    PyObject *capi_tmp = NULL;
    PyObject *capi_arglist_list = NULL;
    int capi_j,capi_i = 0;
    int capi_longjmp_ok = 1;
#decl#
#ifdef F2PY_REPORT_ATEXIT
f2py_cb_start_clock();
#endif
    cb = get_active_#name#();
    if (cb == NULL) {
        capi_longjmp_ok = 0;
        cb = &cb_local;
    }
    capi_arglist = cb->args_capi;
    CFUNCSMESS(\"cb:Call-back function #name# (maxnofargs=#maxnofargs#(-#nofoptargs#))\\n\");
    CFUNCSMESSPY(\"cb:#name#_capi=\",cb->capi);
    if (cb->capi==NULL) {
        capi_longjmp_ok = 0;
        cb->capi = PyObject_GetAttrString(#modulename#_module,\"#argname#\");
        CFUNCSMESSPY(\"cb:#name#_capi=\",cb->capi);
    }
    if (cb->capi==NULL) {
        PyErr_SetString(#modulename#_error,\"cb: Callback #argname# not defined (as an argument or module #modulename# attribute).\\n\");
        goto capi_fail;
    }
    if (F2PyCapsule_Check(cb->capi)) {
    #name#_typedef #name#_cptr;
    #name#_cptr = F2PyCapsule_AsVoidPtr(cb->capi);
    #returncptr#(*#name#_cptr)(#optargs_nm##args_nm##strarglens_nm#);
    #return#
    }
    if (capi_arglist==NULL) {
        capi_longjmp_ok = 0;
        capi_tmp = PyObject_GetAttrString(#modulename#_module,\"#argname#_extra_args\");
        if (capi_tmp) {
            capi_arglist = (PyTupleObject *)PySequence_Tuple(capi_tmp);
            Py_DECREF(capi_tmp);
            if (capi_arglist==NULL) {
                PyErr_SetString(#modulename#_error,\"Failed to convert #modulename#.#argname#_extra_args to tuple.\\n\");
                goto capi_fail;
            }
        } else {
            PyErr_Clear();
            capi_arglist = (PyTupleObject *)Py_BuildValue(\"()\");
        }
    }
    if (capi_arglist == NULL) {
        PyErr_SetString(#modulename#_error,\"Callback #argname# argument list is not set.\\n\");
        goto capi_fail;
    }
#setdims#
#ifdef PYPY_VERSION
#define CAPI_ARGLIST_SETITEM(idx, value) PyList_SetItem((PyObject *)capi_arglist_list, idx, value)
    capi_arglist_list = PySequence_List(capi_arglist);
    if (capi_arglist_list == NULL) goto capi_fail;
#else
#define CAPI_ARGLIST_SETITEM(idx, value) PyTuple_SetItem((PyObject *)capi_arglist, idx, value)
#endif
#pyobjfrom#
#undef CAPI_ARGLIST_SETITEM
#ifdef PYPY_VERSION
    CFUNCSMESSPY(\"cb:capi_arglist=\",capi_arglist_list);
#else
    CFUNCSMESSPY(\"cb:capi_arglist=\",capi_arglist);
#endif
    CFUNCSMESS(\"cb:Call-back calling Python function #argname#.\\n\");
#ifdef F2PY_REPORT_ATEXIT
f2py_cb_start_call_clock();
#endif
#ifdef PYPY_VERSION
    capi_return = PyObject_CallObject(cb->capi,(PyObject *)capi_arglist_list);
    Py_DECREF(capi_arglist_list);
    capi_arglist_list = NULL;
#else
    capi_return = PyObject_CallObject(cb->capi,(PyObject *)capi_arglist);
#endif
#ifdef F2PY_REPORT_ATEXIT
f2py_cb_stop_call_clock();
#endif
    CFUNCSMESSPY(\"cb:capi_return=\",capi_return);
    if (capi_return == NULL) {
        fprintf(stderr,\"capi_return is NULL\\n\");
        goto capi_fail;
    }
    if (capi_return == Py_None) {
        Py_DECREF(capi_return);
        capi_return = Py_BuildValue(\"()\");
    }
    else if (!PyTuple_Check(capi_return)) {
        capi_return = Py_BuildValue(\"(N)\",capi_return);
    }
    capi_j = PyTuple_Size(capi_return);
    capi_i = 0;
#frompyobj#
    CFUNCSMESS(\"cb:#name#:successful\\n\");
    Py_DECREF(capi_return);
#ifdef F2PY_REPORT_ATEXIT
f2py_cb_stop_clock();
#endif
    goto capi_return_pt;
capi_fail:
    fprintf(stderr,\"Call-back #name# failed.\\n\");
    Py_XDECREF(capi_return);
    Py_XDECREF(capi_arglist_list);
    if (capi_longjmp_ok) {
        longjmp(cb->jmpbuf,-1);
    }
capi_return_pt:
    ;
#return#
}
#endtitle#
""",
    'need': ['setjmp.h', 'CFUNCSMESS', 'F2PY_THREAD_LOCAL_DECL'],
    'maxnofargs': '#maxnofargs#',
    'nofoptargs': '#nofoptargs#',
    'docstr': """\
    def #argname#(#docsignature#): return #docreturn#\\n\\
#docstrsigns#""",
    'latexdocstr': """
{{}\\verb@def #argname#(#latexdocsignature#): return #docreturn#@{}}
#routnote#

#latexdocstrsigns#""",
    'docstrshort': 'def #argname#(#docsignature#): return #docreturn#'
}
cb_rout_rules = [
    {  # Init
        'separatorsfor': {'decl': '\n',
                          'args': ',', 'optargs': '', 'pyobjfrom': '\n', 'freemem': '\n',
                          'args_td': ',', 'optargs_td': '',
                          'args_nm': ',', 'optargs_nm': '',
                          'frompyobj': '\n', 'setdims': '\n',
                          'docstrsigns': '\\n"\n"',
                          'latexdocstrsigns': '\n',
                          'latexdocstrreq': '\n', 'latexdocstropt': '\n',
                          'latexdocstrout': '\n', 'latexdocstrcbs': '\n',
                          },
        'decl': '/*decl*/', 'pyobjfrom': '/*pyobjfrom*/', 'frompyobj': '/*frompyobj*/',
        'args': [], 'optargs': '', 'return': '', 'strarglens': '', 'freemem': '/*freemem*/',
        'args_td': [], 'optargs_td': '', 'strarglens_td': '',
        'args_nm': [], 'optargs_nm': '', 'strarglens_nm': '',
        'noargs': '',
        'setdims': '/*setdims*/',
        'docstrsigns': '', 'latexdocstrsigns': '',
        'docstrreq': '    Required arguments:',
        'docstropt': '    Optional arguments:',
        'docstrout': '    Return objects:',
        'docstrcbs': '    Call-back functions:',
        'docreturn': '', 'docsign': '', 'docsignopt': '',
        'latexdocstrreq': '\\noindent Required arguments:',
        'latexdocstropt': '\\noindent Optional arguments:',
        'latexdocstrout': '\\noindent Return objects:',
        'latexdocstrcbs': '\\noindent Call-back functions:',
        'routnote': {hasnote: '--- #note#', l_not(hasnote): ''},
    }, {  # Function
        'decl': '    #ctype# return_value = 0;',
        'frompyobj': [
            {debugcapi: '    CFUNCSMESS("cb:Getting return_value->");'},
            '''\
    if (capi_j>capi_i) {
        GETSCALARFROMPYTUPLE(capi_return,capi_i++,&return_value,#ctype#,
          "#ctype#_from_pyobj failed in converting return_value of"
          " call-back function #name# to C #ctype#\\n");
    } else {
        fprintf(stderr,"Warning: call-back function #name# did not provide"
                       " return value (index=%d, type=#ctype#)\\n",capi_i);
    }''',
            {debugcapi:
             '    fprintf(stderr,"#showvalueformat#.\\n",return_value);'}
        ],
        'need': ['#ctype#_from_pyobj', {debugcapi: 'CFUNCSMESS'}, 'GETSCALARFROMPYTUPLE'],
        'return': '    return return_value;',
        '_check': l_and(isfunction, l_not(isstringfunction), l_not(iscomplexfunction))
    },
    {  # String function
        'pyobjfrom': {debugcapi: '    fprintf(stderr,"debug-capi:cb:#name#:%d:\\n",return_value_len);'},
        'args': '#ctype# return_value,int return_value_len',
        'args_nm': 'return_value,&return_value_len',
        'args_td': '#ctype# ,int',
        'frompyobj': [
            {debugcapi: '    CFUNCSMESS("cb:Getting return_value->\\"");'},
            """\
    if (capi_j>capi_i) {
        GETSTRFROMPYTUPLE(capi_return,capi_i++,return_value,return_value_len);
    } else {
        fprintf(stderr,"Warning: call-back function #name# did not provide"
                       " return value (index=%d, type=#ctype#)\\n",capi_i);
    }""",
            {debugcapi:
             '    fprintf(stderr,"#showvalueformat#\\".\\n",return_value);'}
        ],
        'need': ['#ctype#_from_pyobj', {debugcapi: 'CFUNCSMESS'},
                 'string.h', 'GETSTRFROMPYTUPLE'],
        'return': 'return;',
        '_check': isstringfunction
    },
    {  # Complex function
        'optargs': """
#ifndef F2PY_CB_RETURNCOMPLEX
#ctype# *return_value
#endif
""",
        'optargs_nm': """
#ifndef F2PY_CB_RETURNCOMPLEX
return_value
#endif
""",
        'optargs_td': """
#ifndef F2PY_CB_RETURNCOMPLEX
#ctype# *
#endif
""",
        'decl': """
#ifdef F2PY_CB_RETURNCOMPLEX
    #ctype# return_value = {0, 0};
#endif
""",
        'frompyobj': [
            {debugcapi: '    CFUNCSMESS("cb:Getting return_value->");'},
            """\
    if (capi_j>capi_i) {
#ifdef F2PY_CB_RETURNCOMPLEX
        GETSCALARFROMPYTUPLE(capi_return,capi_i++,&return_value,#ctype#,
          \"#ctype#_from_pyobj failed in converting return_value of call-back\"
          \" function #name# to C #ctype#\\n\");
#else
        GETSCALARFROMPYTUPLE(capi_return,capi_i++,return_value,#ctype#,
          \"#ctype#_from_pyobj failed in converting return_value of call-back\"
          \" function #name# to C #ctype#\\n\");
#endif
    } else {
        fprintf(stderr,
                \"Warning: call-back function #name# did not provide\"
                \" return value (index=%d, type=#ctype#)\\n\",capi_i);
    }""",
            {debugcapi: """\
#ifdef F2PY_CB_RETURNCOMPLEX
    fprintf(stderr,\"#showvalueformat#.\\n\",(return_value).r,(return_value).i);
#else
    fprintf(stderr,\"#showvalueformat#.\\n\",(*return_value).r,(*return_value).i);
#endif
"""}
        ],
        'return': """
#ifdef F2PY_CB_RETURNCOMPLEX
    return return_value;
#else
    return;
#endif
""",
        'need': ['#ctype#_from_pyobj', {debugcapi: 'CFUNCSMESS'},
                 'string.h', 'GETSCALARFROMPYTUPLE', '#ctype#'],
        '_check': iscomplexfunction
    },
    {'docstrout': '        #pydocsignout#',
     'latexdocstrout': ['\\item[]{{}\\verb@#pydocsignout#@{}}',
                        {hasnote: '--- #note#'}],
     'docreturn': '#rname#,',
     '_check': isfunction},
    {'_check': issubroutine, 'return': 'return;'}
]

cb_arg_rules = [
    {  # Doc
        'docstropt': {l_and(isoptional, isintent_nothide): '        #pydocsign#'},
        'docstrreq': {l_and(isrequired, isintent_nothide): '        #pydocsign#'},
        'docstrout': {isintent_out: '        #pydocsignout#'},
        'latexdocstropt': {l_and(isoptional, isintent_nothide): ['\\item[]{{}\\verb@#pydocsign#@{}}',
                                                                 {hasnote: '--- #note#'}]},
        'latexdocstrreq': {l_and(isrequired, isintent_nothide): ['\\item[]{{}\\verb@#pydocsign#@{}}',
                                                                 {hasnote: '--- #note#'}]},
        'latexdocstrout': {isintent_out: ['\\item[]{{}\\verb@#pydocsignout#@{}}',
                                          {l_and(hasnote, isintent_hide): '--- #note#',
                                           l_and(hasnote, isintent_nothide): '--- See above.'}]},
        'docsign': {l_and(isrequired, isintent_nothide): '#varname#,'},
        'docsignopt': {l_and(isoptional, isintent_nothide): '#varname#,'},
        'depend': ''
    },
    {
        'args': {
            l_and(isscalar, isintent_c): '#ctype# #varname_i#',
            l_and(isscalar, l_not(isintent_c)): '#ctype# *#varname_i#_cb_capi',
            isarray: '#ctype# *#varname_i#',
            isstring: '#ctype# #varname_i#'
        },
        'args_nm': {
            l_and(isscalar, isintent_c): '#varname_i#',
            l_and(isscalar, l_not(isintent_c)): '#varname_i#_cb_capi',
            isarray: '#varname_i#',
            isstring: '#varname_i#'
        },
        'args_td': {
            l_and(isscalar, isintent_c): '#ctype#',
            l_and(isscalar, l_not(isintent_c)): '#ctype# *',
            isarray: '#ctype# *',
            isstring: '#ctype#'
        },
        'need': {l_or(isscalar, isarray, isstring): '#ctype#'},
        # untested with multiple args
        'strarglens': {isstring: ',int #varname_i#_cb_len'},
        'strarglens_td': {isstring: ',int'},  # untested with multiple args
        # untested with multiple args
        'strarglens_nm': {isstring: ',#varname_i#_cb_len'},
    },
    {  # Scalars
        'decl': {l_not(isintent_c): '    #ctype# #varname_i#=(*#varname_i#_cb_capi);'},
        'error': {l_and(isintent_c, isintent_out,
                        throw_error('intent(c,out) is forbidden for callback scalar arguments')):
                  ''},
        'frompyobj': [{debugcapi: '    CFUNCSMESS("cb:Getting #varname#->");'},
                      {isintent_out:
                       '    if (capi_j>capi_i)\n        GETSCALARFROMPYTUPLE(capi_return,capi_i++,#varname_i#_cb_capi,#ctype#,"#ctype#_from_pyobj failed in converting argument #varname# of call-back function #name# to C #ctype#\\n");'},
                      {l_and(debugcapi, l_and(l_not(iscomplex), isintent_c)):
                          '    fprintf(stderr,"#showvalueformat#.\\n",#varname_i#);'},
                      {l_and(debugcapi, l_and(l_not(iscomplex), l_not( isintent_c))):
                          '    fprintf(stderr,"#showvalueformat#.\\n",*#varname_i#_cb_capi);'},
                      {l_and(debugcapi, l_and(iscomplex, isintent_c)):
                          '    fprintf(stderr,"#showvalueformat#.\\n",(#varname_i#).r,(#varname_i#).i);'},
                      {l_and(debugcapi, l_and(iscomplex, l_not( isintent_c))):
                          '    fprintf(stderr,"#showvalueformat#.\\n",(*#varname_i#_cb_capi).r,(*#varname_i#_cb_capi).i);'},
                      ],
        'need': [{isintent_out: ['#ctype#_from_pyobj', 'GETSCALARFROMPYTUPLE']},
                 {debugcapi: 'CFUNCSMESS'}],
        '_check': isscalar
    }, {
        'pyobjfrom': [{isintent_in: """\
    if (cb->nofargs>capi_i)
        if (CAPI_ARGLIST_SETITEM(capi_i++,pyobj_from_#ctype#1(#varname_i#)))
            goto capi_fail;"""},
                      {isintent_inout: """\
    if (cb->nofargs>capi_i)
        if (CAPI_ARGLIST_SETITEM(capi_i++,pyarr_from_p_#ctype#1(#varname_i#_cb_capi)))
            goto capi_fail;"""}],
        'need': [{isintent_in: 'pyobj_from_#ctype#1'},
                 {isintent_inout: 'pyarr_from_p_#ctype#1'},
                 {iscomplex: '#ctype#'}],
        '_check': l_and(isscalar, isintent_nothide),
        '_optional': ''
    }, {  # String
        'frompyobj': [{debugcapi: '    CFUNCSMESS("cb:Getting #varname#->\\"");'},
                      """    if (capi_j>capi_i)
        GETSTRFROMPYTUPLE(capi_return,capi_i++,#varname_i#,#varname_i#_cb_len);""",
                      {debugcapi:
                       '    fprintf(stderr,"#showvalueformat#\\":%d:.\\n",#varname_i#,#varname_i#_cb_len);'},
                      ],
        'need': ['#ctype#', 'GETSTRFROMPYTUPLE',
                 {debugcapi: 'CFUNCSMESS'}, 'string.h'],
        '_check': l_and(isstring, isintent_out)
    }, {
        'pyobjfrom': [
            {debugcapi:
             ('    fprintf(stderr,"debug-capi:cb:#varname#=#showvalueformat#:'
              '%d:\\n",#varname_i#,#varname_i#_cb_len);')},
            {isintent_in: """\
    if (cb->nofargs>capi_i)
        if (CAPI_ARGLIST_SETITEM(capi_i++,pyobj_from_#ctype#1size(#varname_i#,#varname_i#_cb_len)))
            goto capi_fail;"""},
                      {isintent_inout: """\
    if (cb->nofargs>capi_i) {
        int #varname_i#_cb_dims[] = {#varname_i#_cb_len};
        if (CAPI_ARGLIST_SETITEM(capi_i++,pyarr_from_p_#ctype#1(#varname_i#,#varname_i#_cb_dims)))
            goto capi_fail;
    }"""}],
        'need': [{isintent_in: 'pyobj_from_#ctype#1size'},
                 {isintent_inout: 'pyarr_from_p_#ctype#1'}],
        '_check': l_and(isstring, isintent_nothide),
        '_optional': ''
    },
    # Array ...
    {
        'decl': '    npy_intp #varname_i#_Dims[#rank#] = {#rank*[-1]#};',
        'setdims': '    #cbsetdims#;',
        '_check': isarray,
        '_depend': ''
    },
    {
        'pyobjfrom': [{debugcapi: '    fprintf(stderr,"debug-capi:cb:#varname#\\n");'},
                      {isintent_c: """\
    if (cb->nofargs>capi_i) {
        /* tmp_arr will be inserted to capi_arglist_list that will be
           destroyed when leaving callback function wrapper together
           with tmp_arr. */
        PyArrayObject *tmp_arr = (PyArrayObject *)PyArray_New(&PyArray_Type,
          #rank#,#varname_i#_Dims,#atype#,NULL,(char*)#varname_i#,#elsize#,
          NPY_ARRAY_CARRAY,NULL);
""",
                       l_not(isintent_c): """\
    if (cb->nofargs>capi_i) {
        /* tmp_arr will be inserted to capi_arglist_list that will be
           destroyed when leaving callback function wrapper together
           with tmp_arr. */
        PyArrayObject *tmp_arr = (PyArrayObject *)PyArray_New(&PyArray_Type,
          #rank#,#varname_i#_Dims,#atype#,NULL,(char*)#varname_i#,#elsize#,
          NPY_ARRAY_FARRAY,NULL);
""",
                       },
                      """
        if (tmp_arr==NULL)
            goto capi_fail;
        if (CAPI_ARGLIST_SETITEM(capi_i++,(PyObject *)tmp_arr))
            goto capi_fail;
}"""],
        '_check': l_and(isarray, isintent_nothide, l_or(isintent_in, isintent_inout)),
        '_optional': '',
    }, {
        'frompyobj': [{debugcapi: '    CFUNCSMESS("cb:Getting #varname#->");'},
                      """    if (capi_j>capi_i) {
        PyArrayObject *rv_cb_arr = NULL;
        if ((capi_tmp = PyTuple_GetItem(capi_return,capi_i++))==NULL) goto capi_fail;
        rv_cb_arr =  array_from_pyobj(#atype#,#varname_i#_Dims,#rank#,F2PY_INTENT_IN""",
                      {isintent_c: '|F2PY_INTENT_C'},
                      """,capi_tmp);
        if (rv_cb_arr == NULL) {
            fprintf(stderr,\"rv_cb_arr is NULL\\n\");
            goto capi_fail;
        }
        MEMCOPY(#varname_i#,PyArray_DATA(rv_cb_arr),PyArray_NBYTES(rv_cb_arr));
        if (capi_tmp != (PyObject *)rv_cb_arr) {
            Py_DECREF(rv_cb_arr);
        }
    }""",
                      {debugcapi: '    fprintf(stderr,"<-.\\n");'},
                      ],
        'need': ['MEMCOPY', {iscomplexarray: '#ctype#'}],
        '_check': l_and(isarray, isintent_out)
    }, {
        'docreturn': '#varname#,',
        '_check': isintent_out
    }
]

################## Build call-back module #############
cb_map = {}


def buildcallbacks(m):
    cb_map[m['name']] = []
    for bi in m['body']:
        if bi['block'] == 'interface':
            for b in bi['body']:
                if b:
                    buildcallback(b, m['name'])
                else:
                    errmess('warning: empty body for %s\n' % (m['name']))


def buildcallback(rout, um):
    from . import capi_maps

    outmess('    Constructing call-back function "cb_%s_in_%s"\n' %
            (rout['name'], um))
    args, depargs = getargs(rout)
    capi_maps.depargs = depargs
    var = rout['vars']
    vrd = capi_maps.cb_routsign2map(rout, um)
    rd = dictappend({}, vrd)
    cb_map[um].append([rout['name'], rd['name']])
    for r in cb_rout_rules:
        if ('_check' in r and r['_check'](rout)) or ('_check' not in r):
            ar = applyrules(r, vrd, rout)
            rd = dictappend(rd, ar)
    savevrd = {}
    for i, a in enumerate(args):
        vrd = capi_maps.cb_sign2map(a, var[a], index=i)
        savevrd[a] = vrd
        for r in cb_arg_rules:
            if '_depend' in r:
                continue
            if '_optional' in r and isoptional(var[a]):
                continue
            if ('_check' in r and r['_check'](var[a])) or ('_check' not in r):
                ar = applyrules(r, vrd, var[a])
                rd = dictappend(rd, ar)
                if '_break' in r:
                    break
    for a in args:
        vrd = savevrd[a]
        for r in cb_arg_rules:
            if '_depend' in r:
                continue
            if ('_optional' not in r) or ('_optional' in r and isrequired(var[a])):
                continue
            if ('_check' in r and r['_check'](var[a])) or ('_check' not in r):
                ar = applyrules(r, vrd, var[a])
                rd = dictappend(rd, ar)
                if '_break' in r:
                    break
    for a in depargs:
        vrd = savevrd[a]
        for r in cb_arg_rules:
            if '_depend' not in r:
                continue
            if '_optional' in r:
                continue
            if ('_check' in r and r['_check'](var[a])) or ('_check' not in r):
                ar = applyrules(r, vrd, var[a])
                rd = dictappend(rd, ar)
                if '_break' in r:
                    break
    if 'args' in rd and 'optargs' in rd:
        if isinstance(rd['optargs'], list):
            rd['optargs'] = rd['optargs'] + ["""
#ifndef F2PY_CB_RETURNCOMPLEX
,
#endif
"""]
            rd['optargs_nm'] = rd['optargs_nm'] + ["""
#ifndef F2PY_CB_RETURNCOMPLEX
,
#endif
"""]
            rd['optargs_td'] = rd['optargs_td'] + ["""
#ifndef F2PY_CB_RETURNCOMPLEX
,
#endif
"""]
    if isinstance(rd['docreturn'], list):
        rd['docreturn'] = stripcomma(
            replace('#docreturn#', {'docreturn': rd['docreturn']}))
    optargs = stripcomma(replace('#docsignopt#',
                                 {'docsignopt': rd['docsignopt']}
                                 ))
    if optargs == '':
        rd['docsignature'] = stripcomma(
            replace('#docsign#', {'docsign': rd['docsign']}))
    else:
        rd['docsignature'] = replace('#docsign#[#docsignopt#]',
                                     {'docsign': rd['docsign'],
                                      'docsignopt': optargs,
                                      })
    rd['latexdocsignature'] = rd['docsignature'].replace('_', '\\_')
    rd['latexdocsignature'] = rd['latexdocsignature'].replace(',', ', ')
    rd['docstrsigns'] = []
    rd['latexdocstrsigns'] = []
    for k in ['docstrreq', 'docstropt', 'docstrout', 'docstrcbs']:
        if k in rd and isinstance(rd[k], list):
            rd['docstrsigns'] = rd['docstrsigns'] + rd[k]
        k = 'latex' + k
        if k in rd and isinstance(rd[k], list):
            rd['latexdocstrsigns'] = rd['latexdocstrsigns'] + rd[k][0:1] +\
                ['\\begin{description}'] + rd[k][1:] +\
                ['\\end{description}']
    if 'args' not in rd:
        rd['args'] = ''
        rd['args_td'] = ''
        rd['args_nm'] = ''
    if not (rd.get('args') or rd.get('optargs') or rd.get('strarglens')):
        rd['noargs'] = 'void'

    ar = applyrules(cb_routine_rules, rd)
    cfuncs.callbacks[rd['name']] = ar['body']
    if isinstance(ar['need'], str):
        ar['need'] = [ar['need']]

    if 'need' in rd:
        for t in cfuncs.typedefs.keys():
            if t in rd['need']:
                ar['need'].append(t)

    cfuncs.typedefs_generated[rd['name'] + '_typedef'] = ar['cbtypedefs']
    ar['need'].append(rd['name'] + '_typedef')
    cfuncs.needs[rd['name']] = ar['need']

    capi_maps.lcb2_map[rd['name']] = {'maxnofargs': ar['maxnofargs'],
                                      'nofoptargs': ar['nofoptargs'],
                                      'docstr': ar['docstr'],
                                      'latexdocstr': ar['latexdocstr'],
                                      'argname': rd['argname']
                                      }
    outmess('      %s\n' % (ar['docstrshort']))
    return
################## Build call-back function #############