grafast/dist/steps/coalesce.js

Cutting edge GraphQL planning and execution engine

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CoalesceStep = void 0;
exports.coalesce = coalesce;
const constants_ts_1 = require("../constants.js");
const step_ts_1 = require("../step.js");
const constant_ts_1 = require("./constant.js");
const ube0 = () => null;
const ube1 = (_info, a) => a ?? null;
const ube2 = (_info, a, b) => a ?? b ?? null;
const ube3 = (_info, a, b, c) => a ?? b ?? c ?? null;
const ube4 = (_info, a, b, c, d) => a ?? b ?? c ?? d ?? null;
class CoalesceStep extends step_ts_1.UnbatchedStep {
    static { this.$$export = {
        moduleName: "grafast",
        exportName: "CoalesceStep",
    }; }
    constructor(steps) {
        super();
        this.isSyncAndSafe = true;
        this.allowMultipleOptimizations = true;
        for (const step of steps) {
            this.addDataDependency({
                step,
                acceptFlags: constants_ts_1.FLAG_INHIBITED | constants_ts_1.FLAG_NULL,
            });
        }
    }
    finalize() {
        // Use optimal callback functions rather than looping
        const l = this.dependencies.length;
        if (l === 0)
            this.unbatchedExecute = ube0;
        else if (l === 1)
            this.unbatchedExecute = ube1;
        else if (l === 2)
            this.unbatchedExecute = ube2;
        else if (l === 3)
            this.unbatchedExecute = ube3;
        else if (l === 4)
            this.unbatchedExecute = ube4;
        else {
            // Keep default
        }
        super.finalize();
    }
    unbatchedExecute(_info, ...values) {
        return values.find((v) => v != null) ?? null;
    }
}
exports.CoalesceStep = CoalesceStep;
function coalesce(...input) {
    const list = Array.isArray(input[0])
        ? input[0]
        : input;
    if (list.length === 0) {
        return (0, constant_ts_1.constant)(null);
    }
    return new CoalesceStep(list);
}
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