def edit( fn ):
    fnn = re.sub( r'^\./', '', fn )
    # print(fnn)

    # read in
    fd = open( fn, 'r' )
    ti = fd.read()
    fd.close
    t = ti

    pattern = r'\n\s*_cerf_cmplx z\[NTST\] = \{\s*?((C\(.+?,\s*?.+?\)(,\s*|\s*\};\s*))+)' + \
        r'\n\s*_cerf_cmplx w\[NTST\] = \{\s*?((C\(.+?,\s*?.+?\)(,\s*|\s*\};\s*))+)' + \
        r'.*?zTest\(.*?,.*?, (%s),.*?\);'
    zz = {}
    ww = {}
    names = []
    rr = re.compile(pattern % r'\w+')
    for m in re.finditer(rr, t):
        name = m.group(7)
        zz[name] = m.group(1)
        ww[name] = m.group(4)
        names.append(name)
    print("found names", names)

    def mysplit(s):
        ret = []
        for m in re.finditer(r'C\(.+?,\s*?.+?\)', s):
            ret.append(m.group(0))
        return ret

    for name in names:
        za = mysplit(zz[name])
        wa = mysplit(ww[name])
        if len(za)!=len(wa):
            raise Exception("array mismatch")
        out = ""
        for i in range(len(za)):
            out += "    ZTEST(result, 1e-13, %s(%s), %s);\n" % ( name, za[i], wa[i] )
        print("...", name, ":", len(za), "tests")
        rr = re.compile(pattern % name)
        t = re.sub(rr, out, t, 1)

    # save result
    if t==ti:
        return 0
    print( "Changed " + fn )
    fd = open( fn, 'w' )
    fd.write( t )
    fd.close
    return 1

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