112 lines
3.6 KiB
JavaScript
112 lines
3.6 KiB
JavaScript
"use strict";
|
|
|
|
var _assert = require("assert");
|
|
|
|
var _assert2 = _interopRequireDefault(_assert);
|
|
|
|
var _babelTypes = require("babel-types");
|
|
|
|
var t = _interopRequireWildcard(_babelTypes);
|
|
|
|
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
|
|
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
|
|
var m = require("private").makeAccessor(); /**
|
|
* Copyright (c) 2014, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD-style license found in the
|
|
* https://raw.github.com/facebook/regenerator/master/LICENSE file. An
|
|
* additional grant of patent rights can be found in the PATENTS file in
|
|
* the same directory.
|
|
*/
|
|
|
|
var hasOwn = Object.prototype.hasOwnProperty;
|
|
|
|
function makePredicate(propertyName, knownTypes) {
|
|
function onlyChildren(node) {
|
|
t.assertNode(node);
|
|
|
|
// Assume no side effects until we find out otherwise.
|
|
var result = false;
|
|
|
|
function check(child) {
|
|
if (result) {
|
|
// Do nothing.
|
|
} else if (Array.isArray(child)) {
|
|
child.some(check);
|
|
} else if (t.isNode(child)) {
|
|
_assert2.default.strictEqual(result, false);
|
|
result = predicate(child);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
var keys = t.VISITOR_KEYS[node.type];
|
|
if (keys) {
|
|
for (var i = 0; i < keys.length; i++) {
|
|
var key = keys[i];
|
|
var child = node[key];
|
|
check(child);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
function predicate(node) {
|
|
t.assertNode(node);
|
|
|
|
var meta = m(node);
|
|
if (hasOwn.call(meta, propertyName)) return meta[propertyName];
|
|
|
|
// Certain types are "opaque," which means they have no side
|
|
// effects or leaps and we don't care about their subexpressions.
|
|
if (hasOwn.call(opaqueTypes, node.type)) return meta[propertyName] = false;
|
|
|
|
if (hasOwn.call(knownTypes, node.type)) return meta[propertyName] = true;
|
|
|
|
return meta[propertyName] = onlyChildren(node);
|
|
}
|
|
|
|
predicate.onlyChildren = onlyChildren;
|
|
|
|
return predicate;
|
|
}
|
|
|
|
var opaqueTypes = {
|
|
FunctionExpression: true,
|
|
ArrowFunctionExpression: true
|
|
};
|
|
|
|
// These types potentially have side effects regardless of what side
|
|
// effects their subexpressions have.
|
|
var sideEffectTypes = {
|
|
CallExpression: true, // Anything could happen!
|
|
ForInStatement: true, // Modifies the key variable.
|
|
UnaryExpression: true, // Think delete.
|
|
BinaryExpression: true, // Might invoke .toString() or .valueOf().
|
|
AssignmentExpression: true, // Side-effecting by definition.
|
|
UpdateExpression: true, // Updates are essentially assignments.
|
|
NewExpression: true // Similar to CallExpression.
|
|
};
|
|
|
|
// These types are the direct cause of all leaps in control flow.
|
|
var leapTypes = {
|
|
YieldExpression: true,
|
|
BreakStatement: true,
|
|
ContinueStatement: true,
|
|
ReturnStatement: true,
|
|
ThrowStatement: true
|
|
};
|
|
|
|
// All leap types are also side effect types.
|
|
for (var type in leapTypes) {
|
|
if (hasOwn.call(leapTypes, type)) {
|
|
sideEffectTypes[type] = leapTypes[type];
|
|
}
|
|
}
|
|
|
|
exports.hasSideEffects = makePredicate("hasSideEffects", sideEffectTypes);
|
|
exports.containsLeap = makePredicate("containsLeap", leapTypes); |