import definitions from "../../lib/definitions/index.js";
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const has = Function.call.bind(Object.prototype.hasOwnProperty);
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function joinComparisons(leftArr, right) {
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return (
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leftArr.map(JSON.stringify).join(` === ${right} || `) + ` === ${right}`
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);
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}
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function addIsHelper(type, aliasKeys, deprecated) {
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const targetType = JSON.stringify(type);
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let aliasSource = "";
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if (aliasKeys) {
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aliasSource = joinComparisons(aliasKeys, "nodeType");
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}
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let placeholderSource = "";
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const placeholderTypes = [];
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if (
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definitions.PLACEHOLDERS.includes(type) &&
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has(definitions.FLIPPED_ALIAS_KEYS, type)
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) {
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placeholderTypes.push(type);
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}
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if (has(definitions.PLACEHOLDERS_FLIPPED_ALIAS, type)) {
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placeholderTypes.push(...definitions.PLACEHOLDERS_FLIPPED_ALIAS[type]);
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}
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if (placeholderTypes.length > 0) {
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placeholderSource =
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' || nodeType === "Placeholder" && (' +
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joinComparisons(
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placeholderTypes,
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"(node as t.Placeholder).expectedNode"
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) +
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")";
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}
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const result =
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definitions.NODE_FIELDS[type] || definitions.FLIPPED_ALIAS_KEYS[type]
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? `node is t.${type}`
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: "boolean";
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return `export function is${type}(node: object | null | undefined, opts?: object | null): ${result} {
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${deprecated || ""}
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if (!node) return false;
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const nodeType = (node as t.Node).type;
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if (${
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aliasSource ? aliasSource : `nodeType === ${targetType}`
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}${placeholderSource}) {
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if (typeof opts === "undefined") {
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return true;
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} else {
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return shallowEqual(node, opts);
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}
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}
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return false;
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}
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`;
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}
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export default function generateValidators() {
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let output = `/*
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* This file is auto-generated! Do not modify it directly.
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* To re-generate run 'make build'
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*/
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import shallowEqual from "../../utils/shallowEqual";
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import type * as t from "../..";\n\n`;
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Object.keys(definitions.VISITOR_KEYS).forEach(type => {
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output += addIsHelper(type);
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});
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Object.keys(definitions.FLIPPED_ALIAS_KEYS).forEach(type => {
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output += addIsHelper(type, definitions.FLIPPED_ALIAS_KEYS[type]);
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});
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Object.keys(definitions.DEPRECATED_KEYS).forEach(type => {
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const newType = definitions.DEPRECATED_KEYS[type];
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const deprecated = `console.trace("The node type ${type} has been renamed to ${newType}");`;
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output += addIsHelper(type, null, deprecated);
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});
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return output;
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}
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