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context.js
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context.js
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// This file contains methods responsible for maintaining a TraversalContext.
import traverse from "../index";
export function call(key): boolean {
let opts = this.opts;
this.debug(() => key);
if (this.node) {
if (this._call(opts[key])) return true;
}
if (this.node) {
return this._call(opts[this.node.type] && opts[this.node.type][key]);
}
return false;
}
export function _call(fns?: Array<Function>): boolean {
if (!fns) return false;
for (let fn of fns) {
if (!fn) continue;
let node = this.node;
if (!node) return true;
let ret = fn.call(this.state, this, this.state);
if (ret) throw new Error(`Unexpected return value from visitor method ${fn}`);
// node has been replaced, it will have been requeued
if (this.node !== node) return true;
if (this.shouldStop || this.shouldSkip || this.removed) return true;
}
return false;
}
export function isBlacklisted(): boolean {
let blacklist = this.opts.blacklist;
return blacklist && blacklist.indexOf(this.node.type) > -1;
}
export function visit(): boolean {
if (!this.node) {
return false;
}
if (this.isBlacklisted()) {
return false;
}
if (this.opts.shouldSkip && this.opts.shouldSkip(this)) {
return false;
}
if (this.call("enter") || this.shouldSkip) {
this.debug(() => "Skip...");
return this.shouldStop;
}
this.debug(() => "Recursing into...");
traverse.node(this.node, this.opts, this.scope, this.state, this, this.skipKeys);
this.call("exit");
return this.shouldStop;
}
export function skip() {
this.shouldSkip = true;
}
export function skipKey(key) {
this.skipKeys[key] = true;
}
export function stop() {
this.shouldStop = true;
this.shouldSkip = true;
}
export function setScope() {
if (this.opts && this.opts.noScope) return;
let target = this.context && this.context.scope;
if (!target) {
let path = this.parentPath;
while (path && !target) {
if (path.opts && path.opts.noScope) return;
target = path.scope;
path = path.parentPath;
}
}
this.scope = this.getScope(target);
if (this.scope) this.scope.init();
}
export function setContext(context) {
this.shouldSkip = false;
this.shouldStop = false;
this.removed = false;
this.skipKeys = {};
if (context) {
this.context = context;
this.state = context.state;
this.opts = context.opts;
}
this.setScope();
return this;
}
/**
* Here we resync the node paths `key` and `container`. If they've changed according
* to what we have stored internally then we attempt to resync by crawling and looking
* for the new values.
*/
export function resync() {
if (this.removed) return;
this._resyncParent();
this._resyncList();
this._resyncKey();
//this._resyncRemoved();
}
export function _resyncParent() {
if (this.parentPath) {
this.parent = this.parentPath.node;
}
}
export function _resyncKey() {
if (!this.container) return;
if (this.node === this.container[this.key]) return;
// grrr, path key is out of sync. this is likely due to a modification to the AST
// not done through our path APIs
if (Array.isArray(this.container)) {
for (let i = 0; i < this.container.length; i++) {
if (this.container[i] === this.node) {
return this.setKey(i);
}
}
} else {
for (let key in this.container) {
if (this.container[key] === this.node) {
return this.setKey(key);
}
}
}
// ¯\_(ツ)_/¯ who knows where it's gone lol
this.key = null;
}
export function _resyncList() {
if (!this.parent || !this.inList) return;
let newContainer = this.parent[this.listKey];
if (this.container === newContainer) return;
// container is out of sync. this is likely the result of it being reassigned
this.container = newContainer || null;
}
export function _resyncRemoved() {
if (this.key == null || !this.container || this.container[this.key] !== this.node) {
this._markRemoved();
}
}
export function popContext() {
this.contexts.pop();
this.setContext(this.contexts[this.contexts.length - 1]);
}
export function pushContext(context) {
this.contexts.push(context);
this.setContext(context);
}
export function setup(parentPath, container, listKey, key) {
this.inList = !!listKey;
this.listKey = listKey;
this.parentKey = listKey || key;
this.container = container;
this.parentPath = parentPath || this.parentPath;
this.setKey(key);
}
export function setKey(key) {
this.key = key;
this.node = this.container[this.key];
this.type = this.node && this.node.type;
}
export function requeue(pathToQueue = this) {
if (pathToQueue.removed) return;
// TODO(loganfsmyth): This should be switched back to queue in parent contexts
// automatically once #2892 and #4135 have been resolved. See #4140.
// let contexts = this._getQueueContexts();
let contexts = this.contexts;
for (let context of contexts) {
context.maybeQueue(pathToQueue);
}
}
export function _getQueueContexts() {
let path = this;
let contexts = this.contexts;
while (!contexts.length) {
path = path.parentPath;
contexts = path.contexts;
}
return contexts;
}