| import {InternMap} from "d3-array"; |
| import {initRange} from "./init.js"; |
|
|
| export const implicit = Symbol("implicit"); |
|
|
| export default function ordinal() { |
| var index = new InternMap(), |
| domain = [], |
| range = [], |
| unknown = implicit; |
|
|
| function scale(d) { |
| let i = index.get(d); |
| if (i === undefined) { |
| if (unknown !== implicit) return unknown; |
| index.set(d, i = domain.push(d) - 1); |
| } |
| return range[i % range.length]; |
| } |
|
|
| scale.domain = function(_) { |
| if (!arguments.length) return domain.slice(); |
| domain = [], index = new InternMap(); |
| for (const value of _) { |
| if (index.has(value)) continue; |
| index.set(value, domain.push(value) - 1); |
| } |
| return scale; |
| }; |
|
|
| scale.range = function(_) { |
| return arguments.length ? (range = Array.from(_), scale) : range.slice(); |
| }; |
|
|
| scale.unknown = function(_) { |
| return arguments.length ? (unknown = _, scale) : unknown; |
| }; |
|
|
| scale.copy = function() { |
| return ordinal(domain, range).unknown(unknown); |
| }; |
|
|
| initRange.apply(scale, arguments); |
|
|
| return scale; |
| } |
|
|
