workflow/node_modules/@antv/x6/es/view/flag.js

/* eslint-disable no-bitwise */
export class FlagManager {
    get cell() {
        return this.view.cell;
    }
    constructor(view, actions, bootstrap = []) {
        this.view = view;
        const flags = {};
        const attrs = {};
        let shift = 0;
        Object.keys(actions).forEach((attr) => {
            let labels = actions[attr];
            if (!Array.isArray(labels)) {
                labels = [labels];
            }
            labels.forEach((label) => {
                let flag = flags[label];
                if (!flag) {
                    shift += 1;
                    flag = flags[label] = 1 << shift;
                }
                attrs[attr] |= flag;
            });
        });
        let labels = bootstrap;
        if (!Array.isArray(labels)) {
            labels = [labels];
        }
        labels.forEach((label) => {
            if (!flags[label]) {
                shift += 1;
                flags[label] = 1 << shift;
            }
        });
        // 26 - 30 are reserved for paper flags
        // 31+ overflows maximal number
        if (shift > 25) {
            throw new Error('Maximum number of flags exceeded.');
        }
        this.flags = flags;
        this.attrs = attrs;
        this.bootstrap = bootstrap;
    }
    getFlag(label) {
        const flags = this.flags;
        if (flags == null) {
            return 0;
        }
        if (Array.isArray(label)) {
            return label.reduce((memo, key) => memo | flags[key], 0);
        }
        return flags[label] | 0;
    }
    hasAction(flag, label) {
        return flag & this.getFlag(label);
    }
    removeAction(flag, label) {
        return flag ^ (flag & this.getFlag(label));
    }
    getBootstrapFlag() {
        return this.getFlag(this.bootstrap);
    }
    getChangedFlag() {
        let flag = 0;
        if (!this.attrs) {
            return flag;
        }
        Object.keys(this.attrs).forEach((attr) => {
            if (this.cell.hasChanged(attr)) {
                flag |= this.attrs[attr];
            }
        });
        return flag;
    }
}
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