All files / src/compiler/phases visitors.js

95.83% Statements 69/72
100% Branches 11/11
66.66% Functions 4/6
95.83% Lines 69/72

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 732x 2x   2x 2x     2x 2x 2x 2x 2x 2x 2x 2x 2x 14791x 14791x 14791x 14791x 59078x 798940x 798940x 798940x 59078x 14791x 14791x 14791x 14791x 14791x 14791x 586913x 586913x 586913x 586913x 586913x 586913x 586913x 406486x 406486x 406486x 406486x 406486x 1097227x 1097227x 691027x 691027x 691027x 691027x 691027x 691027x 691027x 691027x 319635x 319635x 319635x 691027x 691027x 1097227x 371106x 371106x 1097227x 406486x 406486x 406486x 586913x 586913x 586913x 586913x 14791x 14791x 14791x  
const overrides = {
	visit() {
		throw new Error('Cannot call visit() during analysis');
	},
	stop() {
		throw new Error('Cannot call stop() during analysis');
	}
};
 
/**
 * @template {{ type: string }} T
 * @template U
 * @param  {...import('zimmerframe').Visitors<T, U>} tasks
 * @returns
 */
export function merge(...tasks) {
	/** @type {Record<string, any[]>} */
	const visitors = {};
 
	for (const task of tasks) {
		for (const key in task) {
			if (!visitors[key]) visitors[key] = [];
			visitors[key].push(task[key]);
		}
	}
 
	/** @type {import('zimmerframe').Visitors<T, U>} */
	// @ts-expect-error
	const combined = {};
 
	for (const key in visitors) {
		const fns = visitors[key];
 
		/**
		 * @param {T} node
		 * @param {import('zimmerframe').Context<T, U>} context
		 */
		function visitor(node, context) {
			/**
			 * @param {number} i
			 * @param {U} state
			 */
			function go(i, state) {
				const fn = fns[i];
				if (!fn) return context.next(state);
 
				let called_next = false;
 
				fn(node, {
					...context,
					...overrides,
					state,
					next(next_state = state) {
						called_next = true;
						go(i + 1, next_state);
					}
				});
 
				if (!called_next) {
					go(i + 1, state);
				}
			}
 
			go(0, context.state);
		}
 
		// @ts-expect-error
		combined[key] = visitor;
	}
 
	return combined;
}