@initialize:python@
@@
import re

def fmt_parser(_st):
    # a bunch of (non-% or %%), and then (% followed by non-%).
    REG = re.compile('([^%]|%%)*(%[^%])')
    retval = {}
    pos = 0  # where to start searching for next time
    i = 0
    while True:
        match = REG.match(_st, pos)
        if match is None:
            return retval
        fmt = match.group(2)
        pos = match.end()
        idx = pos - len(fmt)
        retval[i] = { 'idx': idx, 'fmt': fmt }
        i += 1

def fmt_replace_by_pos(_str, _idx, _fmt):
    try:
        fmts  = fmt_parser(_str)
        new   = _str

        if _idx == -1:
            _idx = [item for item in range(0, len(fmts))]

        for _i in _idx:
            f     = fmts[_i]
            idx   = f['idx']
            fmt   = f['fmt']
            fmt_l = len(fmt)
            new   = new[:idx] + _fmt + new[idx + fmt_l:]

        return ''.join(new)
    except Exception as e:
        print("** ERROR: Something wrong in fmt_replace_by_pos():\n {}\n".format(str(e)))

@r1@
format list fl;
identifier fn;
expression list e;
position p;
@@

fn("%@fl@", e@p)

@script:python s1@
fl << r1.fl;
fn << r1.fn;
e << r1.e;
p << r1.p;
new_fmt;
to_e;
@@
// Update the %fmt by the position (Position currently hardcode)
new_fmt = fmt_replace_by_pos(coccinelle.fl, { 1, 3, 4 }, "%m")
coccinelle.new_fmt = cocci.make_expr("\"{}\"".format(new_fmt))

// Debug
print("* Debug: {}")
_e = str(coccinelle.e).replace(" ", "")
print("\t->old: {}(\"{}\", {})".format(coccinelle.fn, coccinelle.fl, _e))
print("\t->new: {}(\"{}\", {})".format(coccinelle.fn, new_fmt, _e))
print("")

@main depends on s1 && r1@
format list r1.fl;
expression s1.new_fmt;
identifier r1.fn;
expression list r1.e;
expression list s1.to_e;
position r1.p;
//struct mydata SMD;
//struct mydata* SMDP;
@@

 fn(
-"%@fl@"
+new_fmt
,
e@p
 );