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 14092x 14092x 14092x 14092x 56283x 733485x 733485x 733485x 56283x 14092x 14092x 14092x 14092x 14092x 14092x 571811x 571811x 571811x 571811x 571811x 571811x 571811x 397560x 397560x 397560x 397560x 397560x 1058599x 1058599x 661309x 661309x 661309x 661309x 661309x 661309x 661309x 661309x 297683x 297683x 297683x 661309x 661309x 1058599x 363356x 363356x 1058599x 397560x 397560x 397560x 571811x 571811x 571811x 571811x 14092x 14092x 14092x  
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;
}