| 1 | "use strict";
|
|---|
| 2 |
|
|---|
| 3 | Object.defineProperty(exports, "__esModule", {
|
|---|
| 4 | value: true
|
|---|
| 5 | });
|
|---|
| 6 | exports.evaluate = evaluate;
|
|---|
| 7 | exports.evaluateTruthy = evaluateTruthy;
|
|---|
| 8 | const VALID_OBJECT_CALLEES = ["Number", "String", "Math"];
|
|---|
| 9 | const VALID_IDENTIFIER_CALLEES = ["isFinite", "isNaN", "parseFloat", "parseInt", "decodeURI", "decodeURIComponent", "encodeURI", "encodeURIComponent", null, null];
|
|---|
| 10 | const INVALID_METHODS = ["random"];
|
|---|
| 11 | function isValidObjectCallee(val) {
|
|---|
| 12 | return VALID_OBJECT_CALLEES.includes(val);
|
|---|
| 13 | }
|
|---|
| 14 | function isValidIdentifierCallee(val) {
|
|---|
| 15 | return VALID_IDENTIFIER_CALLEES.includes(val);
|
|---|
| 16 | }
|
|---|
| 17 | function isInvalidMethod(val) {
|
|---|
| 18 | return INVALID_METHODS.includes(val);
|
|---|
| 19 | }
|
|---|
| 20 | function evaluateTruthy() {
|
|---|
| 21 | const res = this.evaluate();
|
|---|
| 22 | if (res.confident) return !!res.value;
|
|---|
| 23 | }
|
|---|
| 24 | function deopt(path, state) {
|
|---|
| 25 | if (!state.confident) return;
|
|---|
| 26 | state.deoptPath = path;
|
|---|
| 27 | state.confident = false;
|
|---|
| 28 | }
|
|---|
| 29 | const Globals = new Map([["undefined", undefined], ["Infinity", Infinity], ["NaN", NaN]]);
|
|---|
| 30 | function evaluateCached(path, state) {
|
|---|
| 31 | const {
|
|---|
| 32 | node
|
|---|
| 33 | } = path;
|
|---|
| 34 | const {
|
|---|
| 35 | seen
|
|---|
| 36 | } = state;
|
|---|
| 37 | if (seen.has(node)) {
|
|---|
| 38 | const existing = seen.get(node);
|
|---|
| 39 | if (existing.resolved) {
|
|---|
| 40 | return existing.value;
|
|---|
| 41 | } else {
|
|---|
| 42 | deopt(path, state);
|
|---|
| 43 | return;
|
|---|
| 44 | }
|
|---|
| 45 | } else {
|
|---|
| 46 | const item = {
|
|---|
| 47 | resolved: false
|
|---|
| 48 | };
|
|---|
| 49 | seen.set(node, item);
|
|---|
| 50 | const val = _evaluate(path, state);
|
|---|
| 51 | if (state.confident) {
|
|---|
| 52 | item.resolved = true;
|
|---|
| 53 | item.value = val;
|
|---|
| 54 | }
|
|---|
| 55 | return val;
|
|---|
| 56 | }
|
|---|
| 57 | }
|
|---|
| 58 | function _evaluate(path, state) {
|
|---|
| 59 | if (!state.confident) return;
|
|---|
| 60 | if (path.isSequenceExpression()) {
|
|---|
| 61 | const exprs = path.get("expressions");
|
|---|
| 62 | return evaluateCached(exprs[exprs.length - 1], state);
|
|---|
| 63 | }
|
|---|
| 64 | if (path.isStringLiteral() || path.isNumericLiteral() || path.isBooleanLiteral()) {
|
|---|
| 65 | return path.node.value;
|
|---|
| 66 | }
|
|---|
| 67 | if (path.isNullLiteral()) {
|
|---|
| 68 | return null;
|
|---|
| 69 | }
|
|---|
| 70 | if (path.isTemplateLiteral()) {
|
|---|
| 71 | return evaluateQuasis(path, path.node.quasis, state);
|
|---|
| 72 | }
|
|---|
| 73 | if (path.isTaggedTemplateExpression() && path.get("tag").isMemberExpression()) {
|
|---|
| 74 | const object = path.get("tag.object");
|
|---|
| 75 | const {
|
|---|
| 76 | node: {
|
|---|
| 77 | name
|
|---|
| 78 | }
|
|---|
| 79 | } = object;
|
|---|
| 80 | const property = path.get("tag.property");
|
|---|
| 81 | if (object.isIdentifier() && name === "String" && !path.scope.getBinding(name) && property.isIdentifier() && property.node.name === "raw") {
|
|---|
| 82 | return evaluateQuasis(path, path.node.quasi.quasis, state, true);
|
|---|
| 83 | }
|
|---|
| 84 | }
|
|---|
| 85 | if (path.isConditionalExpression()) {
|
|---|
| 86 | const testResult = evaluateCached(path.get("test"), state);
|
|---|
| 87 | if (!state.confident) return;
|
|---|
| 88 | if (testResult) {
|
|---|
| 89 | return evaluateCached(path.get("consequent"), state);
|
|---|
| 90 | } else {
|
|---|
| 91 | return evaluateCached(path.get("alternate"), state);
|
|---|
| 92 | }
|
|---|
| 93 | }
|
|---|
| 94 | if (path.isExpressionWrapper()) {
|
|---|
| 95 | return evaluateCached(path.get("expression"), state);
|
|---|
| 96 | }
|
|---|
| 97 | if (path.isMemberExpression() && !path.parentPath.isCallExpression({
|
|---|
| 98 | callee: path.node
|
|---|
| 99 | })) {
|
|---|
| 100 | const property = path.get("property");
|
|---|
| 101 | const object = path.get("object");
|
|---|
| 102 | if (object.isLiteral()) {
|
|---|
| 103 | const value = object.node.value;
|
|---|
| 104 | const type = typeof value;
|
|---|
| 105 | let key = null;
|
|---|
| 106 | if (path.node.computed) {
|
|---|
| 107 | key = evaluateCached(property, state);
|
|---|
| 108 | if (!state.confident) return;
|
|---|
| 109 | } else if (property.isIdentifier()) {
|
|---|
| 110 | key = property.node.name;
|
|---|
| 111 | }
|
|---|
| 112 | if ((type === "number" || type === "string") && key != null && (typeof key === "number" || typeof key === "string")) {
|
|---|
| 113 | return value[key];
|
|---|
| 114 | }
|
|---|
| 115 | }
|
|---|
| 116 | }
|
|---|
| 117 | if (path.isReferencedIdentifier()) {
|
|---|
| 118 | const binding = path.scope.getBinding(path.node.name);
|
|---|
| 119 | if (binding) {
|
|---|
| 120 | if (binding.constantViolations.length > 0 || path.node.start < binding.path.node.end) {
|
|---|
| 121 | deopt(binding.path, state);
|
|---|
| 122 | return;
|
|---|
| 123 | }
|
|---|
| 124 | if (binding.hasValue) {
|
|---|
| 125 | return binding.value;
|
|---|
| 126 | }
|
|---|
| 127 | }
|
|---|
| 128 | const name = path.node.name;
|
|---|
| 129 | if (Globals.has(name)) {
|
|---|
| 130 | if (!binding) {
|
|---|
| 131 | return Globals.get(name);
|
|---|
| 132 | }
|
|---|
| 133 | deopt(binding.path, state);
|
|---|
| 134 | return;
|
|---|
| 135 | }
|
|---|
| 136 | const resolved = path.resolve();
|
|---|
| 137 | if (resolved === path) {
|
|---|
| 138 | deopt(path, state);
|
|---|
| 139 | return;
|
|---|
| 140 | } else {
|
|---|
| 141 | return evaluateCached(resolved, state);
|
|---|
| 142 | }
|
|---|
| 143 | }
|
|---|
| 144 | if (path.isUnaryExpression({
|
|---|
| 145 | prefix: true
|
|---|
| 146 | })) {
|
|---|
| 147 | if (path.node.operator === "void") {
|
|---|
| 148 | return undefined;
|
|---|
| 149 | }
|
|---|
| 150 | const argument = path.get("argument");
|
|---|
| 151 | if (path.node.operator === "typeof" && (argument.isFunction() || argument.isClass())) {
|
|---|
| 152 | return "function";
|
|---|
| 153 | }
|
|---|
| 154 | const arg = evaluateCached(argument, state);
|
|---|
| 155 | if (!state.confident) return;
|
|---|
| 156 | switch (path.node.operator) {
|
|---|
| 157 | case "!":
|
|---|
| 158 | return !arg;
|
|---|
| 159 | case "+":
|
|---|
| 160 | return +arg;
|
|---|
| 161 | case "-":
|
|---|
| 162 | return -arg;
|
|---|
| 163 | case "~":
|
|---|
| 164 | return ~arg;
|
|---|
| 165 | case "typeof":
|
|---|
| 166 | return typeof arg;
|
|---|
| 167 | }
|
|---|
| 168 | }
|
|---|
| 169 | if (path.isArrayExpression()) {
|
|---|
| 170 | const arr = [];
|
|---|
| 171 | const elems = path.get("elements");
|
|---|
| 172 | for (const elem of elems) {
|
|---|
| 173 | const elemValue = elem.evaluate();
|
|---|
| 174 | if (elemValue.confident) {
|
|---|
| 175 | arr.push(elemValue.value);
|
|---|
| 176 | } else {
|
|---|
| 177 | deopt(elemValue.deopt, state);
|
|---|
| 178 | return;
|
|---|
| 179 | }
|
|---|
| 180 | }
|
|---|
| 181 | return arr;
|
|---|
| 182 | }
|
|---|
| 183 | if (path.isObjectExpression()) {
|
|---|
| 184 | const obj = {};
|
|---|
| 185 | const props = path.get("properties");
|
|---|
| 186 | for (const prop of props) {
|
|---|
| 187 | if (prop.isObjectMethod() || prop.isSpreadElement()) {
|
|---|
| 188 | deopt(prop, state);
|
|---|
| 189 | return;
|
|---|
| 190 | }
|
|---|
| 191 | const keyPath = prop.get("key");
|
|---|
| 192 | let key;
|
|---|
| 193 | if (prop.node.computed) {
|
|---|
| 194 | key = keyPath.evaluate();
|
|---|
| 195 | if (!key.confident) {
|
|---|
| 196 | deopt(key.deopt, state);
|
|---|
| 197 | return;
|
|---|
| 198 | }
|
|---|
| 199 | key = key.value;
|
|---|
| 200 | } else if (keyPath.isIdentifier()) {
|
|---|
| 201 | key = keyPath.node.name;
|
|---|
| 202 | } else {
|
|---|
| 203 | key = keyPath.node.value;
|
|---|
| 204 | }
|
|---|
| 205 | const valuePath = prop.get("value");
|
|---|
| 206 | let value = valuePath.evaluate();
|
|---|
| 207 | if (!value.confident) {
|
|---|
| 208 | deopt(value.deopt, state);
|
|---|
| 209 | return;
|
|---|
| 210 | }
|
|---|
| 211 | value = value.value;
|
|---|
| 212 | obj[key] = value;
|
|---|
| 213 | }
|
|---|
| 214 | return obj;
|
|---|
| 215 | }
|
|---|
| 216 | if (path.isLogicalExpression()) {
|
|---|
| 217 | const wasConfident = state.confident;
|
|---|
| 218 | const left = evaluateCached(path.get("left"), state);
|
|---|
| 219 | const leftConfident = state.confident;
|
|---|
| 220 | state.confident = wasConfident;
|
|---|
| 221 | const right = evaluateCached(path.get("right"), state);
|
|---|
| 222 | const rightConfident = state.confident;
|
|---|
| 223 | switch (path.node.operator) {
|
|---|
| 224 | case "||":
|
|---|
| 225 | state.confident = leftConfident && (!!left || rightConfident);
|
|---|
| 226 | if (!state.confident) return;
|
|---|
| 227 | return left || right;
|
|---|
| 228 | case "&&":
|
|---|
| 229 | state.confident = leftConfident && (!left || rightConfident);
|
|---|
| 230 | if (!state.confident) return;
|
|---|
| 231 | return left && right;
|
|---|
| 232 | case "??":
|
|---|
| 233 | state.confident = leftConfident && (left != null || rightConfident);
|
|---|
| 234 | if (!state.confident) return;
|
|---|
| 235 | return left != null ? left : right;
|
|---|
| 236 | }
|
|---|
| 237 | }
|
|---|
| 238 | if (path.isBinaryExpression()) {
|
|---|
| 239 | const left = evaluateCached(path.get("left"), state);
|
|---|
| 240 | if (!state.confident) return;
|
|---|
| 241 | const right = evaluateCached(path.get("right"), state);
|
|---|
| 242 | if (!state.confident) return;
|
|---|
| 243 | switch (path.node.operator) {
|
|---|
| 244 | case "-":
|
|---|
| 245 | return left - right;
|
|---|
| 246 | case "+":
|
|---|
| 247 | return left + right;
|
|---|
| 248 | case "/":
|
|---|
| 249 | return left / right;
|
|---|
| 250 | case "*":
|
|---|
| 251 | return left * right;
|
|---|
| 252 | case "%":
|
|---|
| 253 | return left % right;
|
|---|
| 254 | case "**":
|
|---|
| 255 | return Math.pow(left, right);
|
|---|
| 256 | case "<":
|
|---|
| 257 | return left < right;
|
|---|
| 258 | case ">":
|
|---|
| 259 | return left > right;
|
|---|
| 260 | case "<=":
|
|---|
| 261 | return left <= right;
|
|---|
| 262 | case ">=":
|
|---|
| 263 | return left >= right;
|
|---|
| 264 | case "==":
|
|---|
| 265 | return left == right;
|
|---|
| 266 | case "!=":
|
|---|
| 267 | return left != right;
|
|---|
| 268 | case "===":
|
|---|
| 269 | return left === right;
|
|---|
| 270 | case "!==":
|
|---|
| 271 | return left !== right;
|
|---|
| 272 | case "|":
|
|---|
| 273 | return left | right;
|
|---|
| 274 | case "&":
|
|---|
| 275 | return left & right;
|
|---|
| 276 | case "^":
|
|---|
| 277 | return left ^ right;
|
|---|
| 278 | case "<<":
|
|---|
| 279 | return left << right;
|
|---|
| 280 | case ">>":
|
|---|
| 281 | return left >> right;
|
|---|
| 282 | case ">>>":
|
|---|
| 283 | return left >>> right;
|
|---|
| 284 | }
|
|---|
| 285 | }
|
|---|
| 286 | if (path.isCallExpression()) {
|
|---|
| 287 | const callee = path.get("callee");
|
|---|
| 288 | let context;
|
|---|
| 289 | let func;
|
|---|
| 290 | if (callee.isIdentifier() && !path.scope.getBinding(callee.node.name) && (isValidObjectCallee(callee.node.name) || isValidIdentifierCallee(callee.node.name))) {
|
|---|
| 291 | func = global[callee.node.name];
|
|---|
| 292 | }
|
|---|
| 293 | if (callee.isMemberExpression()) {
|
|---|
| 294 | const object = callee.get("object");
|
|---|
| 295 | const property = callee.get("property");
|
|---|
| 296 | if (object.isIdentifier() && property.isIdentifier() && isValidObjectCallee(object.node.name) && !isInvalidMethod(property.node.name)) {
|
|---|
| 297 | context = global[object.node.name];
|
|---|
| 298 | const key = property.node.name;
|
|---|
| 299 | if (hasOwnProperty.call(context, key)) {
|
|---|
| 300 | func = context[key];
|
|---|
| 301 | }
|
|---|
| 302 | }
|
|---|
| 303 | if (object.isLiteral() && property.isIdentifier()) {
|
|---|
| 304 | const type = typeof object.node.value;
|
|---|
| 305 | if (type === "string" || type === "number") {
|
|---|
| 306 | context = object.node.value;
|
|---|
| 307 | func = context[property.node.name];
|
|---|
| 308 | }
|
|---|
| 309 | }
|
|---|
| 310 | }
|
|---|
| 311 | if (func) {
|
|---|
| 312 | const args = path.get("arguments").map(arg => evaluateCached(arg, state));
|
|---|
| 313 | if (!state.confident) return;
|
|---|
| 314 | return func.apply(context, args);
|
|---|
| 315 | }
|
|---|
| 316 | }
|
|---|
| 317 | deopt(path, state);
|
|---|
| 318 | }
|
|---|
| 319 | function evaluateQuasis(path, quasis, state, raw = false) {
|
|---|
| 320 | let str = "";
|
|---|
| 321 | let i = 0;
|
|---|
| 322 | const exprs = path.isTemplateLiteral() ? path.get("expressions") : path.get("quasi.expressions");
|
|---|
| 323 | for (const elem of quasis) {
|
|---|
| 324 | if (!state.confident) break;
|
|---|
| 325 | str += raw ? elem.value.raw : elem.value.cooked;
|
|---|
| 326 | const expr = exprs[i++];
|
|---|
| 327 | if (expr) str += String(evaluateCached(expr, state));
|
|---|
| 328 | }
|
|---|
| 329 | if (!state.confident) return;
|
|---|
| 330 | return str;
|
|---|
| 331 | }
|
|---|
| 332 | function evaluate() {
|
|---|
| 333 | const state = {
|
|---|
| 334 | confident: true,
|
|---|
| 335 | deoptPath: null,
|
|---|
| 336 | seen: new Map()
|
|---|
| 337 | };
|
|---|
| 338 | let value = evaluateCached(this, state);
|
|---|
| 339 | if (!state.confident) value = undefined;
|
|---|
| 340 | return {
|
|---|
| 341 | confident: state.confident,
|
|---|
| 342 | deopt: state.deoptPath,
|
|---|
| 343 | value: value
|
|---|
| 344 | };
|
|---|
| 345 | }
|
|---|
| 346 |
|
|---|
| 347 | //# sourceMappingURL=evaluation.js.map
|
|---|
