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import {slice} from "./array.js";
import constant from "./constant.js";
import offsetNone from "./offset/none.js";
import orderNone from "./order/none.js";
function stackValue(d, key) {
return d[key];
}
export default function() {
var keys = constant([]),
order = orderNone,
offset = offsetNone,
value = stackValue;
function stack(data) {
var kz = keys.apply(this, arguments),
i,
m = data.length,
n = kz.length,
sz = new Array(n),
oz;
for (i = 0; i < n; ++i) {
for (var ki = kz[i], si = sz[i] = new Array(m), j = 0, sij; j < m; ++j) {
si[j] = sij = [0, +value(data[j], ki, j, data)];
sij.data = data[j];
}
si.key = ki;
}
for (i = 0, oz = order(sz); i < n; ++i) {
sz[oz[i]].index = i;
}
offset(sz, oz);
return sz;
}
stack.keys = function(_) {
return arguments.length ? (keys = typeof _ === "function" ? _ : constant(slice.call(_)), stack) : keys;
};
stack.value = function(_) {
return arguments.length ? (value = typeof _ === "function" ? _ : constant(+_), stack) : value;
};
stack.order = function(_) {
return arguments.length ? (order = _ == null ? orderNone : typeof _ === "function" ? _ : constant(slice.call(_)), stack) : order;
};
stack.offset = function(_) {
return arguments.length ? (offset = _ == null ? offsetNone : _, stack) : offset;
};
return stack;
}