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47 lines
1.1 KiB
47 lines
1.1 KiB
5 years ago
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import {map} from "d3-collection";
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import {slice} from "./array";
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export var implicit = {name: "implicit"};
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export default function ordinal(range) {
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var index = map(),
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domain = [],
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unknown = implicit;
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range = range == null ? [] : slice.call(range);
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function scale(d) {
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var key = d + "", i = index.get(key);
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if (!i) {
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if (unknown !== implicit) return unknown;
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index.set(key, i = domain.push(d));
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}
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return range[(i - 1) % range.length];
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}
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scale.domain = function(_) {
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if (!arguments.length) return domain.slice();
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domain = [], index = map();
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var i = -1, n = _.length, d, key;
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while (++i < n) if (!index.has(key = (d = _[i]) + "")) index.set(key, domain.push(d));
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return scale;
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};
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scale.range = function(_) {
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return arguments.length ? (range = slice.call(_), scale) : range.slice();
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};
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scale.unknown = function(_) {
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return arguments.length ? (unknown = _, scale) : unknown;
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};
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scale.copy = function() {
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return ordinal()
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.domain(domain)
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.range(range)
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.unknown(unknown);
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};
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return scale;
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}
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