All files / src/compiler/phases visitors.js

95.89% Statements 70/73
100% Branches 11/11
66.66% Functions 4/6
95.89% Lines 70/73

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 73 742x 2x 2x   2x 2x     2x 2x 2x 2x 2x 2x 2x 2x 2x 14985x 14985x 14985x 14985x 59852x 816048x 816048x 816048x 59852x 14985x 14985x 14985x 14985x 14985x 14985x 600983x 600983x 600983x 600983x 600983x 600983x 600983x 411468x 411468x 411468x 411468x 411468x 1110824x 1110824x 699644x 699644x 699644x 699644x 699644x 699644x 699644x 699644x 323678x 323678x 323678x 699644x 699644x 1110824x 375678x 375678x 1110824x 411468x 411468x 411468x 600983x 600983x 600983x 600983x 14985x 14985x 14985x  
/** @import { Visitors, Context } from 'zimmerframe' */
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  {...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 {Visitors<T, U>} */
	// @ts-expect-error
	const combined = {};
 
	for (const key in visitors) {
		const fns = visitors[key];
 
		/**
		 * @param {T} node
		 * @param {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;
}