354 lines
12 KiB
JavaScript
354 lines
12 KiB
JavaScript
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"use strict";
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exports.__esModule = true;
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var babylon_1 = require("babylon");
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var b = require("babel-types");
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var binaryOperation_1 = require("./binaryOperation");
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function expressionToConstant(expression, options) {
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if (options === void 0) { options = {}; }
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var constant = true;
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function toConstant(expression) {
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if (!constant)
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return;
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if (b.isArrayExpression(expression)) {
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var result_1 = [];
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for (var i = 0; constant && i < expression.elements.length; i++) {
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var element = expression.elements[i];
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if (b.isSpreadElement(element)) {
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var spread = toConstant(element.argument);
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if (!(isSpreadable(spread) && constant)) {
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constant = false;
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}
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else {
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result_1.push.apply(result_1, spread);
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}
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}
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else {
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result_1.push(toConstant(element));
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}
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}
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return result_1;
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}
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if (b.isBinaryExpression(expression)) {
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var left = toConstant(expression.left);
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var right = toConstant(expression.right);
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return constant && binaryOperation_1["default"](expression.operator, left, right);
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}
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if (b.isBooleanLiteral(expression)) {
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return expression.value;
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}
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if (b.isCallExpression(expression)) {
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var args = [];
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for (var i = 0; constant && i < expression.arguments.length; i++) {
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var arg = expression.arguments[i];
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if (b.isSpreadElement(arg)) {
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var spread = toConstant(arg.argument);
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if (!(isSpreadable(spread) && constant)) {
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constant = false;
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}
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else {
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args.push.apply(args, spread);
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}
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}
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else {
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args.push(toConstant(arg));
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}
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}
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if (!constant)
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return;
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if (b.isMemberExpression(expression.callee)) {
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var object = toConstant(expression.callee.object);
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if (!object || !constant) {
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constant = false;
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return;
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}
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var member = expression.callee.computed
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? toConstant(expression.callee.property)
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: b.isIdentifier(expression.callee.property)
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? expression.callee.property.name
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: undefined;
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if (member === undefined && !expression.callee.computed) {
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constant = false;
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}
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if (!constant)
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return;
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if (canCallMethod(object, '' + member)) {
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return object[member].apply(object, args);
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}
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}
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else {
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var callee = toConstant(expression.callee);
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if (!constant)
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return;
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return callee.apply(null, args);
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}
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}
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if (b.isConditionalExpression(expression)) {
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var test = toConstant(expression.test);
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return test
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? toConstant(expression.consequent)
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: toConstant(expression.alternate);
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}
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if (b.isIdentifier(expression)) {
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if (options.constants &&
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{}.hasOwnProperty.call(options.constants, expression.name)) {
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return options.constants[expression.name];
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}
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}
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if (b.isLogicalExpression(expression)) {
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var left = toConstant(expression.left);
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var right = toConstant(expression.right);
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if (constant && expression.operator === '&&') {
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return left && right;
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}
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if (constant && expression.operator === '||') {
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return left || right;
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}
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}
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if (b.isMemberExpression(expression)) {
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var object = toConstant(expression.object);
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if (!object || !constant) {
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constant = false;
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return;
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}
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var member = expression.computed
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? toConstant(expression.property)
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: b.isIdentifier(expression.property)
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? expression.property.name
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: undefined;
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if (member === undefined && !expression.computed) {
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constant = false;
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}
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if (!constant)
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return;
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if ({}.hasOwnProperty.call(object, '' + member) && member[0] !== '_') {
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return object[member];
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}
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}
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if (b.isNullLiteral(expression)) {
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return null;
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}
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if (b.isNumericLiteral(expression)) {
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return expression.value;
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}
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if (b.isObjectExpression(expression)) {
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var result_2 = {};
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for (var i = 0; constant && i < expression.properties.length; i++) {
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var property = expression.properties[i];
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if (b.isObjectProperty(property)) {
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if (property.shorthand) {
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constant = false;
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return;
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}
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var key = property.computed
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? toConstant(property.key)
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: b.isIdentifier(property.key)
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? property.key.name
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: b.isStringLiteral(property.key)
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? property.key.value
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: undefined;
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if (!key || key[0] === '_') {
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constant = false;
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}
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if (!constant)
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return;
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var value = toConstant(property.value);
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if (!constant)
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return;
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result_2[key] = value;
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}
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else if (b.isObjectMethod(property)) {
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constant = false;
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}
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else if (b.isSpreadProperty(property)) {
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var argument = toConstant(property.argument);
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if (!argument)
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constant = false;
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if (!constant)
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return;
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Object.assign(result_2, argument);
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}
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}
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return result_2;
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}
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if (b.isParenthesizedExpression(expression)) {
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return toConstant(expression.expression);
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}
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if (b.isRegExpLiteral(expression)) {
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return new RegExp(expression.pattern, expression.flags);
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}
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if (b.isSequenceExpression(expression)) {
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for (var i = 0; i < expression.expressions.length - 1 && constant; i++) {
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toConstant(expression.expressions[i]);
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}
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return toConstant(expression.expressions[expression.expressions.length - 1]);
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}
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if (b.isStringLiteral(expression)) {
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return expression.value;
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}
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// TODO: TaggedTemplateExpression
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if (b.isTemplateLiteral(expression)) {
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var result_3 = '';
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for (var i = 0; i < expression.quasis.length; i++) {
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var quasi = expression.quasis[i];
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result_3 += quasi.value.cooked;
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if (i < expression.expressions.length) {
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result_3 += '' + toConstant(expression.expressions[i]);
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}
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}
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return result_3;
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}
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if (b.isUnaryExpression(expression)) {
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var argument = toConstant(expression.argument);
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if (!constant) {
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return;
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}
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switch (expression.operator) {
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case '-':
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return -argument;
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case '+':
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return +argument;
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case '!':
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return !argument;
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case '~':
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return ~argument;
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case 'typeof':
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return typeof argument;
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case 'void':
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return void argument;
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}
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}
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constant = false;
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}
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var result = toConstant(expression);
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return constant ? { constant: true, result: result } : { constant: false };
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}
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exports.expressionToConstant = expressionToConstant;
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function isSpreadable(value) {
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return (typeof value === 'string' ||
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Array.isArray(value) ||
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(typeof Set !== 'undefined' && value instanceof Set) ||
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(typeof Map !== 'undefined' && value instanceof Map));
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}
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function shallowEqual(a, b) {
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if (a === b)
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return true;
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if (a && b && typeof a === 'object' && typeof b === 'object') {
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for (var key in a) {
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if (a[key] !== b[key]) {
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return false;
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}
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}
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for (var key in b) {
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if (a[key] !== b[key]) {
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return false;
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}
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}
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return true;
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}
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return false;
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}
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function canCallMethod(object, member) {
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switch (typeof object) {
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case 'boolean':
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switch (member) {
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case 'toString':
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return true;
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default:
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return false;
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}
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case 'number':
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switch (member) {
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case 'toExponential':
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case 'toFixed':
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case 'toPrecision':
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case 'toString':
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return true;
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default:
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return false;
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}
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case 'string':
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switch (member) {
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case 'charAt':
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case 'charCodeAt':
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case 'codePointAt':
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case 'concat':
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case 'endsWith':
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case 'includes':
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case 'indexOf':
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case 'lastIndexOf':
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case 'match':
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case 'normalize':
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case 'padEnd':
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case 'padStart':
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case 'repeat':
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case 'replace':
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case 'search':
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case 'slice':
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case 'split':
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case 'startsWith':
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case 'substr':
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case 'substring':
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case 'toLowerCase':
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case 'toUpperCase':
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case 'trim':
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return true;
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default:
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return false;
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}
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default:
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if (object instanceof RegExp) {
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switch (member) {
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case 'test':
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case 'exec':
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return true;
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default:
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return false;
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}
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}
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return {}.hasOwnProperty.call(object, member) && member[0] !== '_';
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}
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}
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var EMPTY_OBJECT = {};
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var lastSrc = '';
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var lastConstants = EMPTY_OBJECT;
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var lastOptions = EMPTY_OBJECT;
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var lastResult = null;
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var lastWasConstant = false;
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function isConstant(src, constants, options) {
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if (constants === void 0) { constants = EMPTY_OBJECT; }
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if (options === void 0) { options = EMPTY_OBJECT; }
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if (lastSrc === src &&
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shallowEqual(lastConstants, constants) &&
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shallowEqual(lastOptions, options)) {
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return lastWasConstant;
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}
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lastSrc = src;
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lastConstants = constants;
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var ast;
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try {
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ast = babylon_1.parseExpression(src, options);
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}
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catch (ex) {
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return (lastWasConstant = false);
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}
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var _a = expressionToConstant(ast, { constants: constants }), result = _a.result, constant = _a.constant;
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lastResult = result;
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return (lastWasConstant = constant);
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}
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exports.isConstant = isConstant;
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function toConstant(src, constants, options) {
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if (constants === void 0) { constants = EMPTY_OBJECT; }
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if (options === void 0) { options = EMPTY_OBJECT; }
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if (!isConstant(src, constants, options)) {
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throw new Error(JSON.stringify(src) + ' is not constant.');
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}
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return lastResult;
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}
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exports.toConstant = toConstant;
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exports["default"] = isConstant;
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module.exports = isConstant;
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module.exports["default"] = isConstant;
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module.exports.expressionToConstant = expressionToConstant;
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module.exports.isConstant = isConstant;
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module.exports.toConstant = toConstant;
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