79 lines
3.3 KiB
JavaScript
79 lines
3.3 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = simplifyAccess;
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var t = _interopRequireWildcard(require("@babel/types"));
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function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
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function simplifyAccess(path, bindingNames) {
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path.traverse(simpleAssignmentVisitor, {
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scope: path.scope,
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bindingNames,
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seen: new WeakSet()
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});
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}
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const simpleAssignmentVisitor = {
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UpdateExpression: {
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exit(path) {
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const {
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scope,
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bindingNames
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} = this;
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const arg = path.get("argument");
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if (!arg.isIdentifier()) return;
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const localName = arg.node.name;
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if (!bindingNames.has(localName)) return;
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if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
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return;
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}
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if (path.parentPath.isExpressionStatement() && !path.isCompletionRecord()) {
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const operator = path.node.operator == "++" ? "+=" : "-=";
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path.replaceWith(t.assignmentExpression(operator, arg.node, t.numericLiteral(1)));
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} else if (path.node.prefix) {
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path.replaceWith(t.assignmentExpression("=", t.identifier(localName), t.binaryExpression(path.node.operator[0], t.unaryExpression("+", arg.node), t.numericLiteral(1))));
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} else {
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const old = path.scope.generateUidIdentifierBasedOnNode(arg.node, "old");
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const varName = old.name;
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path.scope.push({
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id: old
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});
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const binary = t.binaryExpression(path.node.operator[0], t.identifier(varName), t.numericLiteral(1));
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path.replaceWith(t.sequenceExpression([t.assignmentExpression("=", t.identifier(varName), t.unaryExpression("+", arg.node)), t.assignmentExpression("=", t.cloneNode(arg.node), binary), t.identifier(varName)]));
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}
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}
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},
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AssignmentExpression: {
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exit(path) {
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const {
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scope,
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seen,
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bindingNames
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} = this;
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if (path.node.operator === "=") return;
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if (seen.has(path.node)) return;
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seen.add(path.node);
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const left = path.get("left");
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if (!left.isIdentifier()) return;
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const localName = left.node.name;
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if (!bindingNames.has(localName)) return;
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if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
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return;
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}
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path.node.right = t.binaryExpression(path.node.operator.slice(0, -1), t.cloneNode(path.node.left), path.node.right);
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path.node.operator = "=";
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}
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}
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};
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