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implement Convcs;
include "sys.m";
include "cfg.m";
include "convcs.m";
DEFCSFILE : con "/lib/convcs/charsets";
sys : Sys;
cfg : Cfg;
Record, Tuple : import cfg;
init(csfile : string) : string
{
sys = load Sys Sys->PATH;
cfg = load Cfg Cfg->PATH;
if (cfg == nil)
return sys->sprint("cannot load module %s: %r", Cfg->PATH);
if (csfile == nil)
csfile = DEFCSFILE;
err := cfg->init(csfile);
if (err != nil) {
cfg = nil;
return err;
}
return nil;
}
getbtos(cs : string) : (Btos, string)
{
cs = normalize(cs);
(rec, err) := csalias(cs);
if (err != nil)
return (nil, err);
(path, btostup) := rec.lookup("btos");
if (path == nil)
return (nil, sys->sprint("no converter for %s", cs));
arg := btostup.lookup("arg");
btos := load Btos path;
if (btos == nil)
return (nil, sys->sprint("cannot load converter: %r"));
err = btos->init(arg);
if (err != nil)
return (nil, err);
return (btos, nil);
}
getstob(cs : string) : (Stob, string)
{
cs = normalize(cs);
(rec, err) := csalias(cs);
if (err != nil)
return (nil, err);
(path, stobtup) := rec.lookup("stob");
if (path == nil)
return (nil, sys->sprint("no converter for %s", cs));
arg := stobtup.lookup("arg");
stob := load Stob path;
if (stob == nil)
return (nil, sys->sprint("cannot load converter: %r"));
err = stob->init(arg);
if (err != nil)
return (nil, err);
return (stob, nil);
}
csalias(cs : string) : (ref Cfg->Record, string)
{
# search out charset record - allow for one level of renaming
for (i := 0; i < 2; i++) {
recs := cfg->lookup(cs);
if (recs == nil)
return (nil, sys->sprint("unknown charset %s", cs));
(val, rec) := hd recs;
if (val != nil) {
cs = val;
continue;
}
return (rec, nil);
}
return (nil, sys->sprint("too man aliases for %s\n", cs));
}
enumcs() : list of (string, string, int)
{
d : list of (string, string, int);
for (csl := cfg->getkeys(); csl != nil; csl = tl csl) {
cs := hd csl;
recs := cfg->lookup(cs);
if (recs == nil)
continue; # shouldn't happen!
(val, rec) := hd recs;
if (val != nil)
# an alias - ignore
continue;
(btos, nil) := rec.lookup("btos");
(stob, nil) := rec.lookup("stob");
if (btos == nil && stob == nil)
continue;
mode := 0;
if (btos != nil)
mode = BTOS;
if (stob != nil)
mode |= STOB;
(desc, nil) := rec.lookup("desc");
if (desc == nil)
desc = cs;
d = (cs, desc, mode) :: d;
}
# d is in reverse order to that in the csfile file
l : list of (string, string, int);
for (; d != nil; d = tl d)
l = hd d :: l;
return l;
}
aliases(cs : string) : (string, list of string)
{
cs = normalize(cs);
(mainrec, err) := csalias(cs);
if (err != nil)
return (err, nil);
cs = (hd (hd mainrec.tuples).attrs).name;
(desc, nil) := mainrec.lookup("desc");
if (desc == nil)
desc = cs;
al := cs :: nil;
for (csl := cfg->getkeys(); csl != nil; csl = tl csl) {
name := hd csl;
recs := cfg->lookup(name);
if (recs == nil)
continue; # shouldn't happen!
(val, nil) := hd recs;
if (val != cs)
continue;
al = name :: al;
}
r : list of string;
for (; al != nil; al = tl al)
r = hd al :: r;
return (desc, r);
}
normalize(s : string) : string
{
for (i := 0; i < len s; i++) {
r := s[i];
if (r >= 'A' && r <= 'Z')
s[i] = r + ('a' - 'A');
}
return s;
}
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