85 lines
2.9 KiB
JavaScript
85 lines
2.9 KiB
JavaScript
"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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function t() {
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const data = _interopRequireWildcard(require("@babel/types"));
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t = function () {
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return data;
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};
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return data;
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}
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; 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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}; |