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// These Streams are instantiated by math operations on other Streams
UnaryOpStream : Stream {
var >operator, >a;
*new { arg operator, a;
^super.newCopyArgs(operator, a)
}
next { arg inval;
var vala;
vala = a.next(inval);
if (vala.isNil, { ^nil },{ ^vala.perform(operator); });
}
reset { a.reset }
storeOn { arg stream; stream <<< a << "." << operator }
}
BinaryOpStream : Stream {
var >operator, >a, >b;
*new { arg operator, a, b;
^super.newCopyArgs(operator, a, b)
}
next { arg inval;
var vala, valb;
vala = a.next(inval);
if (vala.isNil, { ^nil });
valb = b.next(inval);
if (valb.isNil, { ^nil });
^vala.perform(operator, valb);
}
reset { a.reset; b.reset }
storeOn { arg stream;
stream << "(" <<< a << " " << operator.asBinOpString << " " <<< b << ")"
}
}
BinaryOpXStream : Stream {
var operator, a, b, vala;
*new { arg operator, a, b;
^super.newCopyArgs(operator, a, b)
}
next { arg inval;
var valb;
if (vala.isNil) {
vala = a.next(inval);
if (vala.isNil) { ^nil };
valb = b.next(inval);
if (valb.isNil, { ^nil });
}{
valb = b.next(inval);
if (valb.isNil) {
vala = a.next(inval);
if (vala.isNil) { ^nil };
b.reset;
valb = b.next(inval);
if (valb.isNil) { ^nil };
};
};
^vala.perform(operator, valb);
}
reset { vala = nil; a.reset; b.reset }
storeOn { arg stream;
stream << "(" <<< a << " " << operator.asBinOpString;
stream << ".x";
stream << " " <<< b << ")"
}
}
NAryOpStream : Stream {
var >operator, >a, arglist;
var isNumeric;
*new { arg operator, a, arglist;
^super.newCopyArgs(operator, a).arglist_(arglist)
}
arglist_ { arg list;
// optimization
isNumeric = list.every({ arg item; item.isNumber or: {item.class === Symbol} }); arglist = list;
}
next { arg inval;
var vala, values;
vala = a.next(inval);
if (vala.isNil, { ^nil });
values = if (isNumeric) { arglist } {
arglist.collect({ arg item; var res;
res = item.next(inval);
if(res.isNil) { ^nil };
res
})
};
^vala.performList(operator, values);
}
reset { a.reset; arglist.do({ arg item; item.reset }) }
storeOn { arg stream; stream <<< a << "." << operator << "(" <<<* arglist << ")" }
}
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