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

Build common block 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: 2005/05/06 10:57:33 $
Pearu Peterson

"""
from . import __version__
f2py_version = __version__.version

from .auxfuncs import (
    hasbody, hascommon, hasnote, isintent_hide, outmess
)
from . import capi_maps
from . import func2subr
from .crackfortran import rmbadname

def findcommonblocks(block, top=1):
    ret = []
    if hascommon(block):
        for key, value in block['common'].items():
            vars_ = {v: block['vars'][v] for v in value}
            ret.append((key, value, vars_))
    elif hasbody(block):
        for b in block['body']:
            ret = ret + findcommonblocks(b, 0)
    if top:
        tret = []
        names = []
        for t in ret:
            if t[0] not in names:
                names.append(t[0])
                tret.append(t)
        return tret
    return ret

def buildhooks(m):
    ret = {'commonhooks': [], 'initcommonhooks': [],
           'docs': ['"COMMON blocks:\\n"']}
    fwrap = ['']

def fadd(line, s=fwrap):
        s[0] = '%s\n      %s' % (s[0], line)
    chooks = ['']

def cadd(line, s=chooks):
        s[0] = '%s\n%s' % (s[0], line)
    ihooks = ['']

def iadd(line, s=ihooks):
        s[0] = '%s\n%s' % (s[0], line)
    doc = ['']

def dadd(line, s=doc):
        s[0] = '%s\n%s' % (s[0], line)
    for (name, vnames, vars) in findcommonblocks(m):
        lower_name = name.lower()
        hnames, inames = [], []
        for n in vnames:
            if isintent_hide(vars[n]):
                hnames.append(n)
            else:
                inames.append(n)
        if hnames:
            outmess('\t\tConstructing COMMON block support for "%s"...\n\t\t  %s\n\t\t  Hidden: %s\n' % (
                name, ','.join(inames), ','.join(hnames)))
        else:
            outmess('\t\tConstructing COMMON block support for "%s"...\n\t\t  %s\n' % (
                name, ','.join(inames)))
        fadd('subroutine f2pyinit%s(setupfunc)' % name)
        fadd('external setupfunc')
        for n in vnames:
            fadd(func2subr.var2fixfortran(vars, n))
        if name == '_BLNK_':
            fadd('common %s' % (','.join(vnames)))
        else:
            fadd('common /%s/ %s' % (name, ','.join(vnames)))
        fadd('call setupfunc(%s)' % (','.join(inames)))
        fadd('end\n')
        cadd('static FortranDataDef f2py_%s_def[] = {' % (name))
        idims = []
        for n in inames:
            ct = capi_maps.getctype(vars[n])
            elsize = capi_maps.get_elsize(vars[n])
            at = capi_maps.c2capi_map[ct]
            dm = capi_maps.getarrdims(n, vars[n])
            if dm['dims']:
                idims.append('(%s)' % (dm['dims']))
            else:
                idims.append('')
            dms = dm['dims'].strip()
            if not dms:
                dms = '-1'
            cadd('\t{\"%s\",%s,{{%s}},%s, %s},'
                 % (n, dm['rank'], dms, at, elsize))
        cadd('\t{NULL}\n};')
        inames1 = rmbadname(inames)
        inames1_tps = ','.join(['char *' + s for s in inames1])
        cadd('static void f2py_setup_%s(%s) {' % (name, inames1_tps))
        cadd('\tint i_f2py=0;')
        for n in inames1:
            cadd('\tf2py_%s_def[i_f2py++].data = %s;' % (name, n))
        cadd('}')
        if '_' in lower_name:
            F_FUNC = 'F_FUNC_US'
        else:
            F_FUNC = 'F_FUNC'
        cadd('extern void %s(f2pyinit%s,F2PYINIT%s)(void(*)(%s));'
             % (F_FUNC, lower_name, name.upper(),
                ','.join(['char*'] * len(inames1))))
        cadd('static void f2py_init_%s(void) {' % name)
        cadd('\t%s(f2pyinit%s,F2PYINIT%s)(f2py_setup_%s);'
             % (F_FUNC, lower_name, name.upper(), name))
        cadd('}\n')
        iadd('\ttmp = PyFortranObject_New(f2py_%s_def,f2py_init_%s);' % (name, name))
        iadd('\tif (tmp == NULL) return NULL;')
        iadd('\tif (F2PyDict_SetItemString(d, \"%s\", tmp) == -1) return NULL;'
             % name)
        iadd('\tPy_DECREF(tmp);')
        tname = name.replace('_', '\\_')
        dadd('\\subsection{Common block \\texttt{%s}}\n' % (tname))
        dadd('\\begin{description}')
        for n in inames:
            dadd('\\item[]{{}\\verb@%s@{}}' %
                 (capi_maps.getarrdocsign(n, vars[n])))
            if hasnote(vars[n]):
                note = vars[n]['note']
                if isinstance(note, list):
                    note = '\n'.join(note)
                dadd('--- %s' % (note))
        dadd('\\end{description}')
        ret['docs'].append(
            '"\t/%s/ %s\\n"' % (name, ','.join(map(lambda v, d: v + d, inames, idims))))
    ret['commonhooks'] = chooks
    ret['initcommonhooks'] = ihooks
    ret['latexdoc'] = doc[0]
    if len(ret['docs']) <= 1:
        ret['docs'] = ''
    return ret, fwrap[0]

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