'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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var helperPluginUtils = require('@babel/helper-plugin-utils');
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var syntaxOptionalChaining = require('@babel/plugin-syntax-optional-chaining');
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var core = require('@babel/core');
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var helperSkipTransparentExpressionWrappers = require('@babel/helper-skip-transparent-expression-wrappers');
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function willPathCastToBoolean(path) {
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const maybeWrapped = findOutermostTransparentParent(path);
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const {
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node,
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parentPath
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} = maybeWrapped;
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if (parentPath.isLogicalExpression()) {
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const {
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operator,
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right
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} = parentPath.node;
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if (operator === "&&" || operator === "||" || operator === "??" && node === right) {
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return willPathCastToBoolean(parentPath);
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}
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}
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if (parentPath.isSequenceExpression()) {
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const {
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expressions
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} = parentPath.node;
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if (expressions[expressions.length - 1] === node) {
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return willPathCastToBoolean(parentPath);
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} else {
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return true;
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}
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}
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return parentPath.isConditional({
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test: node
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}) || parentPath.isUnaryExpression({
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operator: "!"
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}) || parentPath.isLoop({
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test: node
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});
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}
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function findOutermostTransparentParent(path) {
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let maybeWrapped = path;
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path.findParent(p => {
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if (!helperSkipTransparentExpressionWrappers.isTransparentExprWrapper(p.node)) return true;
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maybeWrapped = p;
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});
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return maybeWrapped;
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}
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const {
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ast
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} = core.template.expression;
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function isSimpleMemberExpression(expression) {
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expression = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(expression);
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return core.types.isIdentifier(expression) || core.types.isSuper(expression) || core.types.isMemberExpression(expression) && !expression.computed && isSimpleMemberExpression(expression.object);
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}
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function needsMemoize(path) {
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let optionalPath = path;
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const {
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scope
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} = path;
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while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression()) {
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const {
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node
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} = optionalPath;
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const childPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(
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optionalPath.isOptionalMemberExpression() ? optionalPath.get("object") : optionalPath.get("callee"));
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if (node.optional) {
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return !scope.isStatic(childPath.node);
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}
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optionalPath = childPath;
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}
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}
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function transform(path, {
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pureGetters,
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noDocumentAll
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}) {
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const {
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scope
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} = path;
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const maybeWrapped = findOutermostTransparentParent(path);
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const {
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parentPath
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} = maybeWrapped;
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const willReplacementCastToBoolean = willPathCastToBoolean(maybeWrapped);
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let isDeleteOperation = false;
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const parentIsCall = parentPath.isCallExpression({
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callee: maybeWrapped.node
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}) &&
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path.isOptionalMemberExpression();
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const optionals = [];
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let optionalPath = path;
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if (scope.path.isPattern() && needsMemoize(optionalPath)) {
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path.replaceWith(core.template.ast`(() => ${path.node})()`);
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return;
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}
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while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression()) {
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const {
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node
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} = optionalPath;
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if (node.optional) {
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optionals.push(node);
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}
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if (optionalPath.isOptionalMemberExpression()) {
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optionalPath.node.type = "MemberExpression";
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optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("object"));
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} else if (optionalPath.isOptionalCallExpression()) {
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optionalPath.node.type = "CallExpression";
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optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("callee"));
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}
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}
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let replacementPath = path;
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if (parentPath.isUnaryExpression({
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operator: "delete"
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})) {
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replacementPath = parentPath;
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isDeleteOperation = true;
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}
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for (let i = optionals.length - 1; i >= 0; i--) {
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const node = optionals[i];
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const isCall = core.types.isCallExpression(node);
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const chainWithTypes = isCall ?
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node.callee : node.object;
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const chain = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(chainWithTypes);
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let ref;
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let check;
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if (isCall && core.types.isIdentifier(chain, {
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name: "eval"
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})) {
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check = ref = chain;
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node.callee = core.types.sequenceExpression([core.types.numericLiteral(0), ref]);
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} else if (pureGetters && isCall && isSimpleMemberExpression(chain)) {
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check = ref = node.callee;
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} else {
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ref = scope.maybeGenerateMemoised(chain);
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if (ref) {
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check = core.types.assignmentExpression("=", core.types.cloneNode(ref),
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chainWithTypes);
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isCall ? node.callee = ref : node.object = ref;
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} else {
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check = ref = chainWithTypes;
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}
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}
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if (isCall && core.types.isMemberExpression(chain)) {
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if (pureGetters && isSimpleMemberExpression(chain)) {
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node.callee = chainWithTypes;
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} else {
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const {
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object
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} = chain;
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let context;
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if (core.types.isSuper(object)) {
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context = core.types.thisExpression();
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} else {
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const memoized = scope.maybeGenerateMemoised(object);
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if (memoized) {
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context = memoized;
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chain.object = core.types.assignmentExpression("=", memoized, object);
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} else {
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context = object;
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}
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}
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node.arguments.unshift(core.types.cloneNode(context));
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node.callee = core.types.memberExpression(node.callee, core.types.identifier("call"));
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}
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}
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let replacement = replacementPath.node;
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if (i === 0 && parentIsCall) {
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var _baseRef;
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const object = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(replacement.object
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);
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let baseRef;
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if (!pureGetters || !isSimpleMemberExpression(object)) {
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baseRef = scope.maybeGenerateMemoised(object);
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if (baseRef) {
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replacement.object = core.types.assignmentExpression("=", baseRef, object);
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}
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}
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replacement = core.types.callExpression(core.types.memberExpression(replacement, core.types.identifier("bind")), [core.types.cloneNode((_baseRef = baseRef) != null ? _baseRef : object)]);
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}
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if (willReplacementCastToBoolean) {
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const nonNullishCheck = noDocumentAll ? ast`${core.types.cloneNode(check)} != null` : ast`
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${core.types.cloneNode(check)} !== null && ${core.types.cloneNode(ref)} !== void 0`;
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replacementPath.replaceWith(core.types.logicalExpression("&&", nonNullishCheck, replacement));
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replacementPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(
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replacementPath.get("right"));
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} else {
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const nullishCheck = noDocumentAll ? ast`${core.types.cloneNode(check)} == null` : ast`
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${core.types.cloneNode(check)} === null || ${core.types.cloneNode(ref)} === void 0`;
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const returnValue = isDeleteOperation ? ast`true` : ast`void 0`;
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replacementPath.replaceWith(core.types.conditionalExpression(nullishCheck, returnValue, replacement));
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replacementPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(
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replacementPath.get("alternate"));
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}
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}
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}
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var index = helperPluginUtils.declare((api, options) => {
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var _api$assumption, _api$assumption2;
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api.assertVersion(7);
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const {
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loose = false
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} = options;
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const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : loose;
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const pureGetters = (_api$assumption2 = api.assumption("pureGetters")) != null ? _api$assumption2 : loose;
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return {
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name: "proposal-optional-chaining",
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inherits: syntaxOptionalChaining.default,
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visitor: {
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"OptionalCallExpression|OptionalMemberExpression"(path) {
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transform(path, {
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noDocumentAll,
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pureGetters
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});
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}
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}
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};
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});
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exports["default"] = index;
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exports.transform = transform;
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//# sourceMappingURL=index.js.map
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