nix-in-node/src/transformers/literals.js

"use strict";

const types = require("@babel/types");
const splitFilter = require("split-filter");

module.exports = {
	name: "literals",
	visitors: {
		NixIntegerLiteral: (node) => types.numericLiteral(parseInt(node.value)),
		NixFloatLiteral: (node) => types.numericLiteral(parseFloat(node.value)),
		NixStringLiteral: (node, { defer }) => {
			if (node.parts.length === 1 && node.parts[0].type === "NixInterpolationLiteral") {
				// Fast case; just a simple, non-interpolated string literal
				return types.stringLiteral(node.parts[0].value);
			} else {
				return defer((node) => {
					let [ literals, expressions ] = splitFilter(node.parts, (part) => part.type === "NixInterpolationLiteral");

					return types.templateLiteral(
						literals.map((node) => types.templateElement({ raw: node.value })),
						expressions.map((node) => node.expression)
					);
				});
			}
		}
	}
};