398 lines
10 KiB
JavaScript
398 lines
10 KiB
JavaScript
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"use strict";
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exports.__esModule = true;
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var _typeof2 = require("babel-runtime/helpers/typeof");
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var _typeof3 = _interopRequireDefault(_typeof2);
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var _getIterator2 = require("babel-runtime/core-js/get-iterator");
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var _getIterator3 = _interopRequireDefault(_getIterator2);
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var _map = require("babel-runtime/core-js/map");
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var _map2 = _interopRequireDefault(_map);
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exports.evaluateTruthy = evaluateTruthy;
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exports.evaluate = evaluate;
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var VALID_CALLEES = ["String", "Number", "Math"];
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var INVALID_METHODS = ["random"];
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function evaluateTruthy() {
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var res = this.evaluate();
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if (res.confident) return !!res.value;
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}
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function evaluate() {
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var confident = true;
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var deoptPath = void 0;
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var seen = new _map2.default();
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function deopt(path) {
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if (!confident) return;
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deoptPath = path;
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confident = false;
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}
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var value = evaluate(this);
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if (!confident) value = undefined;
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return {
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confident: confident,
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deopt: deoptPath,
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value: value
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};
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function evaluate(path) {
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var node = path.node;
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if (seen.has(node)) {
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var existing = seen.get(node);
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if (existing.resolved) {
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return existing.value;
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} else {
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deopt(path);
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return;
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}
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} else {
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var item = { resolved: false };
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seen.set(node, item);
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var val = _evaluate(path);
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if (confident) {
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item.resolved = true;
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item.value = val;
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}
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return val;
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}
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}
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function _evaluate(path) {
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if (!confident) return;
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var node = path.node;
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if (path.isSequenceExpression()) {
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var exprs = path.get("expressions");
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return evaluate(exprs[exprs.length - 1]);
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}
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if (path.isStringLiteral() || path.isNumericLiteral() || path.isBooleanLiteral()) {
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return node.value;
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}
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if (path.isNullLiteral()) {
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return null;
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}
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if (path.isTemplateLiteral()) {
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var str = "";
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var i = 0;
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var _exprs = path.get("expressions");
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for (var _iterator = node.quasis, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : (0, _getIterator3.default)(_iterator);;) {
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var _ref;
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if (_isArray) {
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if (_i >= _iterator.length) break;
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_ref = _iterator[_i++];
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} else {
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_i = _iterator.next();
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if (_i.done) break;
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_ref = _i.value;
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}
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var elem = _ref;
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if (!confident) break;
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str += elem.value.cooked;
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var expr = _exprs[i++];
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if (expr) str += String(evaluate(expr));
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}
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if (!confident) return;
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return str;
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}
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if (path.isConditionalExpression()) {
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var testResult = evaluate(path.get("test"));
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if (!confident) return;
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if (testResult) {
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return evaluate(path.get("consequent"));
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} else {
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return evaluate(path.get("alternate"));
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}
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}
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if (path.isExpressionWrapper()) {
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return evaluate(path.get("expression"));
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}
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if (path.isMemberExpression() && !path.parentPath.isCallExpression({ callee: node })) {
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var property = path.get("property");
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var object = path.get("object");
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if (object.isLiteral() && property.isIdentifier()) {
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var _value = object.node.value;
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var type = typeof _value === "undefined" ? "undefined" : (0, _typeof3.default)(_value);
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if (type === "number" || type === "string") {
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return _value[property.node.name];
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}
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}
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}
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if (path.isReferencedIdentifier()) {
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var binding = path.scope.getBinding(node.name);
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if (binding && binding.constantViolations.length > 0) {
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return deopt(binding.path);
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}
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if (binding && path.node.start < binding.path.node.end) {
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return deopt(binding.path);
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}
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if (binding && binding.hasValue) {
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return binding.value;
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} else {
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if (node.name === "undefined") {
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return binding ? deopt(binding.path) : undefined;
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} else if (node.name === "Infinity") {
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return binding ? deopt(binding.path) : Infinity;
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} else if (node.name === "NaN") {
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return binding ? deopt(binding.path) : NaN;
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}
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var resolved = path.resolve();
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if (resolved === path) {
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return deopt(path);
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} else {
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return evaluate(resolved);
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}
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}
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}
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if (path.isUnaryExpression({ prefix: true })) {
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if (node.operator === "void") {
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return undefined;
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}
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var argument = path.get("argument");
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if (node.operator === "typeof" && (argument.isFunction() || argument.isClass())) {
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return "function";
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}
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var arg = evaluate(argument);
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if (!confident) return;
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switch (node.operator) {
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case "!":
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return !arg;
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case "+":
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return +arg;
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case "-":
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return -arg;
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case "~":
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return ~arg;
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case "typeof":
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return typeof arg === "undefined" ? "undefined" : (0, _typeof3.default)(arg);
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}
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}
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if (path.isArrayExpression()) {
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var arr = [];
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var elems = path.get("elements");
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for (var _iterator2 = elems, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : (0, _getIterator3.default)(_iterator2);;) {
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var _ref2;
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if (_isArray2) {
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if (_i2 >= _iterator2.length) break;
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_ref2 = _iterator2[_i2++];
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} else {
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_i2 = _iterator2.next();
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if (_i2.done) break;
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_ref2 = _i2.value;
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}
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var _elem = _ref2;
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_elem = _elem.evaluate();
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if (_elem.confident) {
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arr.push(_elem.value);
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} else {
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return deopt(_elem);
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}
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}
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return arr;
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}
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if (path.isObjectExpression()) {
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var obj = {};
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var props = path.get("properties");
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for (var _iterator3 = props, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : (0, _getIterator3.default)(_iterator3);;) {
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var _ref3;
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if (_isArray3) {
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if (_i3 >= _iterator3.length) break;
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_ref3 = _iterator3[_i3++];
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} else {
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_i3 = _iterator3.next();
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if (_i3.done) break;
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_ref3 = _i3.value;
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}
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var prop = _ref3;
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if (prop.isObjectMethod() || prop.isSpreadProperty()) {
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return deopt(prop);
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}
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var keyPath = prop.get("key");
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var key = keyPath;
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if (prop.node.computed) {
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key = key.evaluate();
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if (!key.confident) {
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return deopt(keyPath);
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}
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key = key.value;
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} else if (key.isIdentifier()) {
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key = key.node.name;
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} else {
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key = key.node.value;
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}
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var valuePath = prop.get("value");
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var _value2 = valuePath.evaluate();
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if (!_value2.confident) {
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return deopt(valuePath);
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}
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_value2 = _value2.value;
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obj[key] = _value2;
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}
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return obj;
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}
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if (path.isLogicalExpression()) {
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var wasConfident = confident;
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var left = evaluate(path.get("left"));
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var leftConfident = confident;
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confident = wasConfident;
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var right = evaluate(path.get("right"));
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var rightConfident = confident;
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confident = leftConfident && rightConfident;
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switch (node.operator) {
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case "||":
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if (left && leftConfident) {
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confident = true;
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return left;
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}
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if (!confident) return;
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return left || right;
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case "&&":
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if (!left && leftConfident || !right && rightConfident) {
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confident = true;
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}
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if (!confident) return;
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return left && right;
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}
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}
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if (path.isBinaryExpression()) {
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var _left = evaluate(path.get("left"));
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if (!confident) return;
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var _right = evaluate(path.get("right"));
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if (!confident) return;
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switch (node.operator) {
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case "-":
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return _left - _right;
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case "+":
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return _left + _right;
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case "/":
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return _left / _right;
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case "*":
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return _left * _right;
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case "%":
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return _left % _right;
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case "**":
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return Math.pow(_left, _right);
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case "<":
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return _left < _right;
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case ">":
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return _left > _right;
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case "<=":
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return _left <= _right;
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case ">=":
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return _left >= _right;
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case "==":
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return _left == _right;
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case "!=":
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return _left != _right;
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case "===":
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return _left === _right;
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case "!==":
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return _left !== _right;
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case "|":
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return _left | _right;
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case "&":
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return _left & _right;
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case "^":
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return _left ^ _right;
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case "<<":
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return _left << _right;
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case ">>":
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return _left >> _right;
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case ">>>":
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return _left >>> _right;
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}
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}
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if (path.isCallExpression()) {
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var callee = path.get("callee");
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var context = void 0;
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var func = void 0;
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if (callee.isIdentifier() && !path.scope.getBinding(callee.node.name, true) && VALID_CALLEES.indexOf(callee.node.name) >= 0) {
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func = global[node.callee.name];
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}
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if (callee.isMemberExpression()) {
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var _object = callee.get("object");
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var _property = callee.get("property");
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if (_object.isIdentifier() && _property.isIdentifier() && VALID_CALLEES.indexOf(_object.node.name) >= 0 && INVALID_METHODS.indexOf(_property.node.name) < 0) {
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context = global[_object.node.name];
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func = context[_property.node.name];
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}
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if (_object.isLiteral() && _property.isIdentifier()) {
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var _type = (0, _typeof3.default)(_object.node.value);
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if (_type === "string" || _type === "number") {
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context = _object.node.value;
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func = context[_property.node.name];
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}
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}
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}
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if (func) {
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var args = path.get("arguments").map(evaluate);
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if (!confident) return;
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return func.apply(context, args);
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}
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}
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deopt(path);
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}
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}
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