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implement Readstrokes;
#
# read structures from stroke classifier files
#
include "sys.m";
sys: Sys;
include "bufio.m";
bufio: Bufio;
Iobuf: import bufio;
include "strokes.m";
strokes: Strokes;
Classifier, Penpoint, Stroke, Region: import strokes;
buildstrokes: Buildstrokes;
init(s: Strokes)
{
sys = load Sys Sys->PATH;
bufio = load Bufio Bufio->PATH;
strokes = s;
}
getint(fp: ref Iobuf): (int, int)
{
while((c := fp.getc()) == ' ' || c == '\t' || c == '\n')
;
if(c < 0)
return (c, 0);
sign := 1;
if(c == '-')
sign = -1;
else if(c == '+')
;
else
fp.ungetc();
rc := 0;
n := 0;
while((c = fp.getc()) >= '0' && c <= '9'){
n = n*10 + (c-'0');
rc = 1;
}
return (rc, n*sign);
}
getstr(fp: ref Iobuf): (int, string)
{
while((c := fp.getc()) == ' ' || c == '\t' || c == '\n')
;
if(c < 0)
return (c, nil);
fp.ungetc();
s := "";
while((c = fp.getc()) != ' ' && c != '\t' && c != '\n')
s[len s] = c;
return (0, s);
}
getpoint(fp: ref Iobuf): (int, Penpoint)
{
(okx, x) := getint(fp);
(oky, y) := getint(fp);
if(okx <= 0 || oky <= 0)
return (-1, (0,0,0));
return (0, (x,y,0));
}
getpoints(fp: ref Iobuf): ref Stroke
{
(ok, npts) := getint(fp);
if(ok <= 0 || npts < 0 || npts > 4000)
return nil;
pts := array[npts] of Penpoint;
for(i := 0; i < npts; i++){
(ok, pts[i]) = getpoint(fp);
if(ok < 0)
return nil;
}
return ref Stroke(npts, pts, 0, 0);
}
read_classifier_points(fp: ref Iobuf, nclass: int): (int, array of string, array of list of ref Stroke)
{
names := array[nclass] of string;
examples := array[nclass] of list of ref Stroke;
for(k := 0; k < nclass; k++){
# read class name and number of examples
(ok, nex) := getint(fp);
if(ok <= 0)
return (-1, nil, nil);
(ok, names[k]) = getstr(fp);
if(ok < 0)
return (ok, nil, nil);
# read examples
for(i := 0; i < nex; i++){
pts := getpoints(fp);
if(pts == nil)
return (-1, nil, nil);
examples[k] = pts :: examples[k];
}
}
return (0, names, examples);
}
#
# read a classifier, using its digest if that exists
#
read_classifier(file: string, build: int, needex: int): (string, ref Classifier)
{
rc := ref Classifier;
l := len file;
digestfile: string;
if(l >= 4 && file[l-4:]==".clx")
digestfile = file;
else if(!needex && l >= 3 && file[l-3:]==".cl")
digestfile = file[0:l-3]+".clx"; # try the digest file first
err: string;
if(digestfile != nil){
fd := sys->open(digestfile, Sys->OREAD);
if(fd != nil){
(err, rc.cnames, rc.dompts) = read_digest(fd);
rc.nclasses = len rc.cnames;
if(rc.cnames == nil)
err = "empty digest file";
if(err == nil)
return (nil, rc);
}else
err = sys->sprint("%r");
if(!build)
return (sys->sprint("digest file: %s", err), nil);
}
if(buildstrokes == nil){
buildstrokes = load Buildstrokes Buildstrokes->PATH;
if(buildstrokes == nil)
return (sys->sprint("module %s: %r", Buildstrokes->PATH), nil);
buildstrokes->init(strokes);
}
fd := sys->open(file, Sys->OREAD);
if(fd == nil)
return (sys->sprint("%r"), nil);
(emsg, cnames, examples) := read_examples(fd);
if(emsg != nil)
return (emsg, nil);
rc.nclasses = len cnames;
(err, rc.canonex, rc.dompts) = buildstrokes->canonical_example(rc.nclasses, cnames, examples);
if(err != nil)
return ("failed to calculate canonical examples", nil);
rc.cnames = cnames;
if(needex)
rc.examples = examples;
return (nil, rc);
}
read_examples(fd: ref Sys->FD): (string, array of string, array of list of ref Strokes->Stroke)
{
fp := bufio->fopen(fd, Bufio->OREAD);
(ok, nclasses) := getint(fp);
if(ok <= 0)
return ("missing number of classes", nil, nil);
(okc, cnames, examples) := read_classifier_points(fp, nclasses);
if(okc < 0)
return ("couldn't read examples", nil, nil);
return (nil, cnames, examples);
}
#
# attempt to read the digest of a classifier,
# and return its contents if successful;
# return a diagnostic if not
#
read_digest(fd: ref Sys->FD): (string, array of string, array of ref Stroke)
{
# Read-in the name and dominant points for each class.
fp := bufio->fopen(fd, Bufio->OREAD);
cnames := array[32] of string;
dompts := array[32] of ref Stroke;
for(nclasses := 0;; nclasses++){
if(nclasses >= len cnames){
a := array[nclasses+32] of string;
a[0:] = cnames;
cnames = a;
b := array[nclasses+32] of ref Stroke;
b[0:] = dompts;
dompts = b;
}
(okn, class) := getstr(fp);
if(okn == Bufio->EOF)
break;
if(class == nil)
return ("expected class name", nil, nil);
cnames[nclasses] = class;
dpts := getpoints(fp);
if(dpts == nil)
return ("bad points list", nil, nil);
strokes->compute_chain_code(dpts);
dompts[nclasses] = dpts;
}
return (nil, cnames[0:nclasses], dompts[0:nclasses]);
}
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