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index.js
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index.js
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/* eslint max-len: 0 */
import TraversalContext from "./context";
import * as visitors from "./visitors";
import * as messages from "babel-messages";
import includes from "lodash/collection/includes";
import * as t from "babel-types";
export { default as NodePath } from "./path";
export { default as Scope } from "./scope";
export { default as Hub } from "./hub";
export { default as cache } from "./path/cache";
export { visitors };
export default function traverse(
parent: Object | Array<Object>,
opts?: Object,
scope?: Object,
state: Object,
parentPath: Object,
) {
if (!parent) return;
if (!opts) opts = {};
if (!opts.noScope && !scope) {
if (parent.type !== "Program" && parent.type !== "File") {
throw new Error(messages.get("traverseNeedsParent", parent.type));
}
}
visitors.explode(opts);
traverse.node(parent, opts, scope, state, parentPath);
}
traverse.visitors = visitors;
traverse.verify = visitors.verify;
traverse.explode = visitors.explode;
traverse.NodePath = require("./path");
traverse.Scope = require("./scope");
traverse.Hub = require("./hub");
traverse.cheap = function (node, enter) {
if (!node) return;
let keys = t.VISITOR_KEYS[node.type];
if (!keys) return;
enter(node);
for (let key of keys) {
let subNode = node[key];
if (Array.isArray(subNode)) {
for (let node of subNode) {
traverse.cheap(node, enter);
}
} else {
traverse.cheap(subNode, enter);
}
}
};
traverse.node = function (node: Object, opts: Object, scope: Object, state: Object, parentPath: Object, skipKeys?) {
let keys: Array = t.VISITOR_KEYS[node.type];
if (!keys) return;
let context = new TraversalContext(scope, opts, state, parentPath);
for (let key of keys) {
if (skipKeys && skipKeys[key]) continue;
if (context.visit(node, key)) return;
}
};
const CLEAR_KEYS: Array = t.COMMENT_KEYS.concat([
"tokens", "comments",
"start", "end", "loc",
"raw", "rawValue"
]);
traverse.clearNode = function (node) {
for (let key of CLEAR_KEYS) {
if (node[key] != null) node[key] = undefined;
}
for (let key in node) {
if (key[0] === "_" && node[key] != null) node[key] = undefined;
}
let syms: Array<Symbol> = Object.getOwnPropertySymbols(node);
for (let sym of syms) {
node[sym] = null;
}
};
traverse.removeProperties = function (tree) {
traverse.cheap(tree, traverse.clearNode);
return tree;
};
function hasBlacklistedType(path, state) {
if (path.node.type === state.type) {
state.has = true;
path.skip();
}
}
traverse.hasType = function (tree: Object, scope: Object, type: Object, blacklistTypes: Array<string>): boolean {
// the node we're searching in is blacklisted
if (includes(blacklistTypes, tree.type)) return false;
// the type we're looking for is the same as the passed node
if (tree.type === type) return true;
let state = {
has: false,
type: type
};
traverse(tree, {
blacklist: blacklistTypes,
enter: hasBlacklistedType
}, scope, state);
return state.has;
};