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 13926x 13926x 13926x 13926x 55623x 710704x 710704x 710704x 55623x 13926x 13926x 13926x 13926x 13926x 13926x 555747x 555747x 555747x 555747x 555747x 555747x 555747x 382389x 382389x 382389x 382389x 382389x 1014623x 1014623x 632500x 632500x 632500x 632500x 632500x 632500x 632500x 632500x 282993x 282993x 282993x 632500x 632500x 1014623x 349241x 349241x 1014623x 382389x 382389x 382389x 555747x 555747x 555747x 555747x 13926x 13926x 13926x  
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;
}