graph-ecs/tests/query.test.js

import { before, describe, it } from 'node:test'
import { addComponent, addEntity, createWorld, defineComponent, Types } from 'bitecs'
import assert from './assert.js'
import { query } from '../src/query.js'

let engine = {}
describe('query', () => {
    before(() => {
        const world = { default: createWorld() }
        const component = {
            Player: defineComponent(null, 10),
            NPC: defineComponent(null, 10),
            Knows: defineComponent({
                from: Types.eid,
                to: Types.eid
            }, 10)
        }

        engine = { world, component }
    })

    it('i just need a test runner', () => {
        const w = engine.world.default
        const { Player, NPC, Knows } = engine.component

        const create = (...components) => {
            const eid = addEntity(w)
            components.forEach(cmp => addComponent(w, cmp, eid))
            return eid
        }

        const knows = (a, b) => {
            const edge = addEntity(w)
            addComponent(w, Knows, edge)
            Knows.from[edge] = a
            Knows.to[edge] = b
            return edge
        }

        const player = create(Player) // 0
        const a = create(NPC) // 1
        const b = create(NPC) // 2
        const c = create(NPC) // 3

        knows(player, a) // 4
        knows(player, c) // 5

        knows(a, player) // 6
        knows(a, b) // 7
        knows(a, c) // 8

        knows(b, a) // 9

        knows(c, player) // 10

        const q = 'MATCH (player:Player)-[e1:Knows]->(a:NPC)-[e2:Knows]->(b:NPC) RETURN player, e1, a, e2, b'
        const result = query(q, engine)
        console.log(`parsing ${q}\n`, result.unwrap())
    })
})