"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.explode = explode;
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exports.merge = merge;
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exports.verify = verify;
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var virtualTypes = require("./path/lib/virtual-types");
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var _t = require("@babel/types");
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const {
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DEPRECATED_KEYS,
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FLIPPED_ALIAS_KEYS,
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TYPES
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} = _t;
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function isVirtualType(type) {
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return type in virtualTypes;
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}
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function explode(visitor) {
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if (visitor._exploded) return visitor;
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visitor._exploded = true;
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for (const nodeType of Object.keys(visitor)) {
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if (shouldIgnoreKey(nodeType)) continue;
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const parts = nodeType.split("|");
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if (parts.length === 1) continue;
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const fns = visitor[nodeType];
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delete visitor[nodeType];
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for (const part of parts) {
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visitor[part] = fns;
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}
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}
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verify(visitor);
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delete visitor.__esModule;
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ensureEntranceObjects(visitor);
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ensureCallbackArrays(visitor);
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for (const nodeType of Object.keys(visitor)) {
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if (shouldIgnoreKey(nodeType)) continue;
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if (!isVirtualType(nodeType)) continue;
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const fns = visitor[nodeType];
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for (const type of Object.keys(fns)) {
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fns[type] = wrapCheck(nodeType, fns[type]);
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}
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delete visitor[nodeType];
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const types = virtualTypes[nodeType];
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if (types !== null) {
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for (const type of types) {
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if (visitor[type]) {
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mergePair(visitor[type], fns);
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} else {
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visitor[type] = fns;
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}
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}
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} else {
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mergePair(visitor, fns);
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}
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}
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for (const nodeType of Object.keys(visitor)) {
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if (shouldIgnoreKey(nodeType)) continue;
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const fns = visitor[nodeType];
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let aliases = FLIPPED_ALIAS_KEYS[nodeType];
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const deprecatedKey = DEPRECATED_KEYS[nodeType];
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if (deprecatedKey) {
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console.trace(`Visitor defined for ${nodeType} but it has been renamed to ${deprecatedKey}`);
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aliases = [deprecatedKey];
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}
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if (!aliases) continue;
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delete visitor[nodeType];
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for (const alias of aliases) {
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const existing = visitor[alias];
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if (existing) {
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mergePair(existing, fns);
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} else {
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visitor[alias] = Object.assign({}, fns);
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}
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}
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}
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for (const nodeType of Object.keys(visitor)) {
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if (shouldIgnoreKey(nodeType)) continue;
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ensureCallbackArrays(visitor[nodeType]);
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}
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return visitor;
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}
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function verify(visitor) {
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if (visitor._verified) return;
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if (typeof visitor === "function") {
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throw new Error("You passed `traverse()` a function when it expected a visitor object, " + "are you sure you didn't mean `{ enter: Function }`?");
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}
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for (const nodeType of Object.keys(visitor)) {
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if (nodeType === "enter" || nodeType === "exit") {
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validateVisitorMethods(nodeType, visitor[nodeType]);
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}
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if (shouldIgnoreKey(nodeType)) continue;
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if (TYPES.indexOf(nodeType) < 0) {
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throw new Error(`You gave us a visitor for the node type ${nodeType} but it's not a valid type`);
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}
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const visitors = visitor[nodeType];
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if (typeof visitors === "object") {
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for (const visitorKey of Object.keys(visitors)) {
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if (visitorKey === "enter" || visitorKey === "exit") {
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validateVisitorMethods(`${nodeType}.${visitorKey}`, visitors[visitorKey]);
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} else {
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throw new Error("You passed `traverse()` a visitor object with the property " + `${nodeType} that has the invalid property ${visitorKey}`);
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}
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}
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}
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}
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visitor._verified = true;
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}
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function validateVisitorMethods(path, val) {
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const fns = [].concat(val);
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for (const fn of fns) {
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if (typeof fn !== "function") {
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throw new TypeError(`Non-function found defined in ${path} with type ${typeof fn}`);
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}
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}
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}
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function merge(visitors, states = [], wrapper) {
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const rootVisitor = {};
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for (let i = 0; i < visitors.length; i++) {
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const visitor = visitors[i];
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const state = states[i];
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explode(visitor);
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for (const type of Object.keys(visitor)) {
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let visitorType = visitor[type];
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if (state || wrapper) {
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visitorType = wrapWithStateOrWrapper(visitorType, state, wrapper);
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}
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const nodeVisitor = rootVisitor[type] || (rootVisitor[type] = {});
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mergePair(nodeVisitor, visitorType);
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}
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}
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return rootVisitor;
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}
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function wrapWithStateOrWrapper(oldVisitor, state, wrapper) {
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const newVisitor = {};
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for (const key of Object.keys(oldVisitor)) {
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let fns = oldVisitor[key];
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if (!Array.isArray(fns)) continue;
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fns = fns.map(function (fn) {
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let newFn = fn;
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if (state) {
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newFn = function (path) {
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return fn.call(state, path, state);
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};
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}
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if (wrapper) {
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newFn = wrapper(state.key, key, newFn);
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}
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if (newFn !== fn) {
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newFn.toString = () => fn.toString();
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}
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return newFn;
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});
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newVisitor[key] = fns;
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}
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return newVisitor;
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}
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function ensureEntranceObjects(obj) {
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for (const key of Object.keys(obj)) {
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if (shouldIgnoreKey(key)) continue;
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const fns = obj[key];
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if (typeof fns === "function") {
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obj[key] = {
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enter: fns
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};
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}
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}
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}
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function ensureCallbackArrays(obj) {
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if (obj.enter && !Array.isArray(obj.enter)) obj.enter = [obj.enter];
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if (obj.exit && !Array.isArray(obj.exit)) obj.exit = [obj.exit];
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}
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function wrapCheck(nodeType, fn) {
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const newFn = function (path) {
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if (path[`is${nodeType}`]()) {
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return fn.apply(this, arguments);
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}
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};
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newFn.toString = () => fn.toString();
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return newFn;
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}
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function shouldIgnoreKey(key) {
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if (key[0] === "_") return true;
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if (key === "enter" || key === "exit" || key === "shouldSkip") return true;
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if (key === "denylist" || key === "noScope" || key === "skipKeys" || key === "blacklist") {
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return true;
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}
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return false;
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}
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function mergePair(dest, src) {
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for (const key of Object.keys(src)) {
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dest[key] = [].concat(dest[key] || [], src[key]);
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}
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}
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//# sourceMappingURL=visitors.js.map
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