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implement Engine;
include "sys.m";
sys: Sys;
include "draw.m";
include "../spree.m";
spree: Spree;
Attributes, Range, Object, Clique, Member: import spree;
clique: ref Clique;
init(g: ref Clique, srvmod: Spree): string
{
sys = load Sys Sys->PATH;
clique = g;
spree = srvmod;
return nil;
}
join(nil: ref Member): string
{
return nil;
}
leave(nil: ref Member)
{
}
number := 0;
currmember: ref Member;
obj(ext: int): ref Object
{
o := currmember.obj(ext);
if (o == nil)
sys->raise("parse:bad object");
return o;
}
Eusage: con "bad command usage";
assert(b: int, err: string)
{
if (b == 0)
sys->raise("parse:" + err);
}
command(member: ref Member, cmd: string): string
{
e := ref Sys->Exception;
if (sys->rescue("parse:*", e) == Sys->EXCEPTION) {
sys->rescued(Sys->ONCE, nil);
currmember = nil;
return e.name[6:];
}
currmember = member;
(nlines, lines) := sys->tokenize(cmd, "\n");
assert(nlines > 0, "unknown command");
(n, toks) := sys->tokenize(hd lines, " ");
assert(n > 0, "unknown command");
case hd toks {
"new" => # new parent visibility\nvisibility attr val\nvisibility attr val...
assert(n == 3, Eusage);
setattrs(clique.newobject(obj(int hd tl toks), int hd tl tl toks), tl lines);
"deck" =>
stack := clique.newobject(nil, ~0);
stack.setattr("type", "stack", ~0);
for (i := 0; i < 6; i++) {
o := clique.newobject(stack, ~0);
o.setattr("face", "down", ~0);
o.setattr("number", string number++, 0);
}
"flip" =>
# flip objid start [end]
assert(n == 2 || n == 3 || n == 4, Eusage);
o := obj(int hd tl toks);
if (n > 2) {
start := int hd tl tl toks;
end := start + 1;
if (n == 4)
end = int hd tl tl tl toks;
assert(start >= 0 && start < len o.children &&
end >= start && end >= 0 && end <= len o.children, "index out of range");
for (; start < end; start++)
flip(o.children[start]);
} else
flip(o);
"set" => # set objid attr val
assert(n == 4, Eusage);
obj(int hd tl toks).setattr(hd tl tl toks, hd tl tl tl toks, ~0);
"vis" => # vis objid flags
assert(n == 3, Eusage);
obj(int hd tl toks).setvisibility(int hd tl tl toks);
"attrvis" => # attrvis objid attr flags
assert(n == 4, Eusage);
o := obj(int hd tl toks);
name := hd tl tl toks;
attr := o.attrs.get(name);
assert(attr != nil, "attribute not found");
o.setattrvisibility(name, int hd tl tl tl toks);
"show" => # show [memberid]
p: ref Member = nil;
if (n == 2) {
memberid := int hd tl toks;
p = clique.member(memberid);
assert(p != nil, "bad memberid");
}
clique.show(p);
"del" or "delete" => # del obj
assert(n == 2, Eusage);
obj(int hd tl toks).delete();
"tx" => # tx src from to dest [index]
assert(n == 5 || n == 6, Eusage);
src, dest: ref Object;
r: Range;
(src, toks) = (obj(int hd tl toks), tl tl toks);
(r.start, toks) = (int hd toks, tl toks);
(r.end, toks) = (int hd toks, tl toks);
(dest, toks) = (obj(int hd toks), tl toks);
index := len dest.children;
if (n == 6)
index = int hd toks;
assert(r.start >= 0 && r.start < len src.children &&
r.end >= 0 && r.end <= len src.children && r.end >= r.start,
"bad range");
src.transfer(r, dest, index);
* =>
assert(0, "bad command");
}
currmember = nil;
return nil;
}
flip(o: ref Object)
{
face := o.getattr("face");
if (face == "down") {
face = "up";
o.setattrvisibility("number", ~0);
} else {
face = "down";
o.setattrvisibility("number", 0);
}
o.setattr("face", face, ~0);
}
setattrs(o: ref Object, lines: list of string): string
{
for (; lines != nil; lines = tl lines) {
# attr val [visibility]
(n, toks) := sys->tokenize(hd lines, " ");
if (n != 2 && n != 3)
return "bad attribute line";
vis := 0;
if (n == 3)
vis = int hd tl tl toks;
o.setattr(hd toks, hd tl toks, vis);
}
return nil;
}
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