@visactor/vchart/esm/data/transforms/stack-split.js

charts lib based @visactor/VGrammar

import { isNil } from "@visactor/vutils";

export const stackSplit = (data, op) => {
    const result = {
        nodes: {}
    }, {fields: fields} = op;
    if (!(null == fields ? void 0 : fields.length)) return result;
    const lastFieldIndex = fields.length - 1;
    let nextNode, leaf, temp = result;
    return data.forEach((dv => {
        dv.latestData && dv.latestData.forEach((d => {
            temp = result;
            for (let i = 0; i < fields.length; i++) {
                const f = fields[i], fV = d[f];
                if (isNil(fV)) break;
                temp.groupField = f, temp.nodes[fV] || (i === lastFieldIndex ? temp.nodes[fV] = {
                    values: []
                } : (nextNode = {
                    nodes: {}
                }, temp.nodes[fV] = nextNode)), i === lastFieldIndex ? (leaf = temp.nodes[fV], leaf.values.push(d)) : temp = temp.nodes[fV];
            }
        }));
    })), result;
};
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