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 14287x 14287x 14287x 14287x 57062x 741780x 741780x 741780x 57062x 14287x 14287x 14287x 14287x 14287x 14287x 565903x 565903x 565903x 565903x 565903x 565903x 565903x 385559x 385559x 385559x 385559x 385559x 1038530x 1038530x 653242x 653242x 653242x 653242x 653242x 653242x 653242x 653242x 301890x 301890x 301890x 653242x 653242x 1038530x 351081x 351081x 1038530x 385559x 385559x 385559x 565903x 565903x 565903x 565903x 14287x 14287x 14287x  
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;
}